:root {
    /* Color Palette - Dark Mode with Vibrant Accents */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #13131a;
    --color-bg-card: rgba(25, 25, 35, 0.6);
    --color-bg-input: rgba(30, 30, 45, 0.8);

    --color-primary: #8b5cf6;
    --color-primary-light: #a78bfa;
    --color-primary-dark: #7c3aed;

    --color-secondary: #06b6d4;
    --color-secondary-light: #22d3ee;

    --color-accent: #f472b6;

    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;

    --color-border: rgba(148, 163, 184, 0.1);
    --color-border-focus: rgba(139, 92, 246, 0.5);

    --color-success: #10b981;
    --color-error: #ef4444;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animated Background Gradient */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 30%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(244, 114, 182, 0.1) 0%, transparent 50%);
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

/* Container */
.container {
    max-width: 950px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* Card */
.card {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.main-card {
    margin-bottom: var(--spacing-xl);
}

/* Section */
.section {
    margin-bottom: var(--spacing-xl);
}

.section:last-of-type {
    margin-bottom: var(--spacing-lg);
}

/* Label */
.label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.label-text {
    color: var(--color-text-primary);
}

.label-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 400;
}

.required {
    color: var(--color-error);
    font-size: var(--font-size-lg);
}

/* Input Group */
.input-group {
    position: relative;
    display: flex;
    gap: var(--spacing-sm);
}

/* Input */
.input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    outline: none;
}

.input::placeholder {
    color: var(--color-text-muted);
}

.input:focus {
    border-color: var(--color-border-focus);
    background: rgba(30, 30, 45, 0.95);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.input:hover:not(:focus) {
    border-color: rgba(148, 163, 184, 0.2);
}

/* Toggle Button */
.toggle-btn {
    padding: var(--spacing-md);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-lg);
    transition: all var(--transition-base);
    outline: none;
}

.toggle-btn:hover {
    background: rgba(30, 30, 45, 0.95);
    border-color: var(--color-border-focus);
}

.toggle-btn:active {
    transform: scale(0.95);
}

/* Select */
.select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
}

.select:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.select option {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

/* Radio Group */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.radio-label:hover {
    border-color: var(--color-border-focus);
    background: rgba(30, 30, 45, 0.95);
}

.radio-input {
    display: none;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    position: relative;
    transition: all var(--transition-base);
}

.radio-input:checked+.radio-custom {
    border-color: var(--color-primary);
    background: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
}

.radio-input:checked+.radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.radio-input:checked~.radio-text {
    color: var(--color-primary-light);
    font-weight: 500;
}

.radio-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border: none;
    border-radius: var(--radius-lg);
    color: white;
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    outline: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(139, 92, 246, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    outline: none;
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    background: rgba(139, 92, 246, 0.1);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: var(--font-size-lg);
}

/* Help Text */
.help-text {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.help-text a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.help-text a:hover {
    color: var(--color-secondary-light);
    text-decoration: underline;
}

/* Result Card */
.result-card {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.result-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.result-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.result-textarea {
    width: 100%;
    min-height: 400px;
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.8;
    resize: vertical;
    outline: none;
    transition: all var(--transition-base);
}

.result-textarea:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.result-footer {
    margin-top: var(--spacing-lg);
}

.result-info {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.loading-content {
    text-align: center;
}

.spinner {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-xl);
    border: 4px solid rgba(139, 92, 246, 0.1);
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* Hidden */
.hidden {
    display: none !important;
}

/* ===== New Feature Styles ===== */

/* Character Counter & Stats */
.stats-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: rgba(139, 92, 246, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.stats-row {
    display: flex;
    justify-content: space-around;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.stats-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.stats-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stats-value {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary-light);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: rgba(148, 163, 184, 0.1);
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 999px;
    transition: width var(--transition-slow), background var(--transition-base);
}

.progress-fill.success {
    background: linear-gradient(90deg, var(--color-success), #34d399);
}

.progress-fill.warning {
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.progress-fill.error {
    background: linear-gradient(90deg, var(--color-error), #f87171);
}

.progress-text {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    min-width: 48px;
    text-align: right;
}

/* Export Dropdown */
.export-dropdown {
    position: relative;
}

.dropdown-arrow {
    font-size: var(--font-size-xs);
    transition: transform var(--transition-base);
}

.export-dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
}

.export-menu {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    min-width: 200px;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    z-index: 100;
    animation: slideDown 0.2s ease-out;
}

.export-option {
    width: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
    text-align: left;
}

.export-option:hover {
    background: rgba(139, 92, 246, 0.15);
    transform: translateX(4px);
}

.export-icon {
    font-size: var(--font-size-lg);
}

/* Preview Tabs */
.preview-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.preview-tab {
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--color-text-muted);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    margin-bottom: -2px;
}

.preview-tab:hover {
    color: var(--color-text-secondary);
}

.preview-tab.active {
    color: var(--color-primary-light);
    border-bottom-color: var(--color-primary);
}

/* Markdown Preview */
.markdown-preview {
    width: 100%;
    min-height: 400px;
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.8;
    overflow-y: auto;
}

.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4,
.markdown-preview h5,
.markdown-preview h6 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    font-weight: 600;
    line-height: 1.3;
}

.markdown-preview h1 {
    font-size: var(--font-size-3xl);
}

.markdown-preview h2 {
    font-size: var(--font-size-2xl);
}

.markdown-preview h3 {
    font-size: var(--font-size-xl);
}

.markdown-preview p {
    margin-bottom: var(--spacing-md);
}

.markdown-preview ul,
.markdown-preview ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.markdown-preview li {
    margin-bottom: var(--spacing-sm);
}

.markdown-preview code {
    padding: 2px 6px;
    background: rgba(139, 92, 246, 0.15);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--color-primary-light);
}

.markdown-preview pre {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(13, 13, 20, 0.8);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.markdown-preview pre code {
    padding: 0;
    background: transparent;
    color: inherit;
}

.markdown-preview blockquote {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
    border-left: 4px solid var(--color-primary);
    color: var(--color-text-secondary);
    font-style: italic;
}

.markdown-preview a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.markdown-preview a:hover {
    color: var(--color-secondary-light);
    text-decoration: underline;
}

.markdown-preview strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.markdown-preview em {
    font-style: italic;
}

/* History Sidebar */
.history-sidebar {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
}

.history-toggle {
    position: absolute;
    left: -48px;
    top: 0;
    width: 48px;
    height: 48px;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-right: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.history-toggle:hover {
    background: rgba(139, 92, 246, 0.15);
    transform: translateX(-4px);
}

.history-panel {
    width: 350px;
    max-height: 80vh;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-right: none;
    border-radius: var(--radius-xl) 0 0 var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    display: flex;
    flex-direction: column;
}

.history-sidebar.open .history-panel {
    transform: translateX(0);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.history-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.clear-history-btn {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--color-error);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
}

.clear-history-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.history-empty {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--color-text-muted);
}

.history-item {
    padding: var(--spacing-md);
    background: rgba(30, 30, 45, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.history-item:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--color-primary);
    transform: translateX(-4px);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.history-item-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.history-item-delete {
    padding: 2px 6px;
    background: transparent;
    border: none;
    color: var(--color-error);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: 4px;
}

.history-item-delete:hover {
    background: rgba(239, 68, 68, 0.15);
}

.history-item-topic {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.history-item-meta {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.history-item-preview {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* CSS Editor */
.css-editor {
    width: 100%;
    animation: fadeInUp 0.3s ease-out;
}

.css-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.css-editor-label {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text-primary);
}

.css-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 400;
}

.css-btn-group {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-template-css {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-sm);
    color: #3b82f6;
    font-size: var(--font-size-xs);
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-template-css:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: #3b82f6;
}

.btn-reset-css {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    color: var(--color-error);
    font-size: var(--font-size-xs);
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-reset-css:hover {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--color-error);
}

.custom-css-textarea {
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-lg);
    background: rgba(13, 13, 20, 0.8);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: #a9dc76;
    font-family: 'Courier New', 'Monaco', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: all var(--transition-base);
}

.custom-css-textarea:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.custom-css-textarea::placeholder {
    color: var(--color-text-muted);
    font-style: italic;
}

.css-editor-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

/* View Mode Toggles */
.view-mode-toggles {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(139, 92, 246, 0.05);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.view-mode-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    transition: all var(--transition-base);
}

.view-mode-btn:hover {
    border-color: var(--color-primary);
    background: rgba(139, 92, 246, 0.1);
}

.view-mode-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.view-icon {
    font-size: var(--font-size-base);
}

/* Preview Container */
.preview-container {
    display: flex;
    gap: var(--spacing-lg);
    width: 100%;
    animation: fadeInUp 0.3s ease-out;
}

.preview-viewport {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-input);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

.preview-viewport.desktop-view {
    min-height: 500px;
}

.preview-viewport.mobile-view {
    max-width: 375px;
    margin: 0 auto;
}

/* Both view mode */
.preview-container.both-view .preview-viewport {
    flex: 1;
}

.preview-container.both-view .mobile-view {
    max-width: 375px;
}

/* Desktop only view */
.preview-container.desktop-only .mobile-view {
    display: none;
}

.preview-container.desktop-only .desktop-view {
    width: 100%;
}

/* Mobile only view */
.preview-container.mobile-only .desktop-view {
    display: none;
}

.preview-container.mobile-only .mobile-view {
    width: 100%;
    max-width: 375px;
    margin: 0 auto;
}

.preview-label {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-primary-light);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.markdown-preview-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    background: white;
    color: #333;
}

/* Markdown content styling in preview */
.markdown-preview-content h1,
.markdown-preview-content h2,
.markdown-preview-content h3,
.markdown-preview-content h4,
.markdown-preview-content h5,
.markdown-preview-content h6 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: #222;
    font-weight: 600;
    line-height: 1.3;
}

.markdown-preview-content h1 {
    font-size: var(--font-size-3xl);
}

.markdown-preview-content h2 {
    font-size: var(--font-size-2xl);
}

.markdown-preview-content h3 {
    font-size: var(--font-size-xl);
}

.markdown-preview-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.markdown-preview-content ul,
.markdown-preview-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.markdown-preview-content li {
    margin-bottom: var(--spacing-sm);
}

.markdown-preview-content code {
    padding: 2px 6px;
    background: #f4f4f4;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: #e91e63;
}

.markdown-preview-content pre {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-lg);
    background: #282c34;
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.markdown-preview-content pre code {
    padding: 0;
    background: transparent;
    color: #abb2bf;
}

.markdown-preview-content blockquote {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
    border-left: 4px solid #8b5cf6;
    color: #666;
    font-style: italic;
}

.markdown-preview-content a {
    color: #8b5cf6;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.markdown-preview-content a:hover {
    color: #06b6d4;
    text-decoration: underline;
}

.markdown-preview-content strong {
    color: #222;
    font-weight: 600;
}

.markdown-preview-content em {
    font-style: italic;
}

.markdown-preview-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

/* Mobile preview specific adjustments */
.mobile-view .markdown-preview-content {
    font-size: 14px;
}

.mobile-view .markdown-preview-content h1 {
    font-size: 1.75rem;
}

.mobile-view .markdown-preview-content h2 {
    font-size: 1.5rem;
}

.mobile-view .markdown-preview-content h3 {
    font-size: 1.25rem;
}

/* Custom Block Styles - :::classname syntax */
.markdown-preview-content [class^="block-"] {
    padding: 16px 20px;
    margin: 20px 0;
    border-radius: 8px;
    border-left: 4px solid;
}

.markdown-preview-content .block-info {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-left-color: #2196f3;
    color: #1565c0;
}

.markdown-preview-content .block-warning {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    border-left-color: #ff9800;
    color: #e65100;
}

.markdown-preview-content .block-success {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border-left-color: #4caf50;
    color: #2e7d32;
}

.markdown-preview-content .block-error {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
    border-left-color: #f44336;
    color: #c62828;
}

.markdown-preview-content .block-tip {
    background: linear-gradient(135deg, #e8eaf6 0%, #c5cae9 100%);
    border-left-color: #673ab7;
    color: #4527a0;
}

.markdown-preview-content .block-note {
    background: linear-gradient(135deg, #fafafa 0%, #eeeeee 100%);
    border-left-color: #9e9e9e;
    color: #424242;
}

.markdown-preview-content .block-highlight {
    background: linear-gradient(135deg, #fffde7 0%, #fff9c4 100%);
    border-left-color: #ffc107;
    color: #f57f17;
    font-weight: 500;
}

.markdown-preview-content .block-card {
    background: white;
    border: 1px solid #e0e0e0;
    border-left: none;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    padding: 24px;
    color: #333;
}

.markdown-preview-content .block-quote {
    background: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
    border-left-color: #9c27b0;
    color: #6a1b9a;
    font-style: italic;
}

/* Security Badges */
.security-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-md);
}

.security-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-success);
    font-weight: 500;
}

.badge-icon {
    font-size: var(--font-size-sm);
}

.badge-text {
    white-space: nowrap;
}

.security-info-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    color: var(--color-primary-light);
    font-family: var(--font-family);
    font-size: var(--font-size-xs);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.security-info-btn:hover {
    background: rgba(139, 92, 246, 0.2);
    transform: translateY(-1px);
}

.info-icon {
    font-size: var(--font-size-sm);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-close {
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--color-error);
    transform: rotate(90deg);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
}

.security-section {
    margin-bottom: var(--spacing-xl);
}

.security-section:last-child {
    margin-bottom: 0;
}

.security-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.section-icon {
    font-size: var(--font-size-xl);
}

.security-section-text {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.security-section-text strong {
    color: var(--color-primary-light);
    font-weight: 600;
}

.connection-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(139, 92, 246, 0.05);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
}

.flow-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.flow-icon {
    font-size: var(--font-size-3xl);
}

.flow-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.flow-arrow {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
}

.security-note {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 500;
}

.inline-link {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: 500;
}

.inline-link:hover {
    color: var(--color-secondary-light);
    text-decoration: underline;
}

.security-tips {
    list-style: none;
    padding: 0;
}

.security-tips li {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(139, 92, 246, 0.05);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.security-tips li::before {
    content: '✓ ';
    color: var(--color-success);
    font-weight: bold;
    margin-right: var(--spacing-xs);
}

.modal-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
}

.btn-modal-close {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-modal-close:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer-link {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-secondary-light);
    text-decoration: underline;
}

.footer-note {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.btn-reset-all {
    margin-top: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-reset-all:hover {
    color: var(--color-error);
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
        max-width: 100%;
        overflow-x: hidden;
    }

    .title {
        font-size: var(--font-size-xl);
        word-break: keep-all;
    }

    .subtitle {
        font-size: var(--font-size-sm);
    }

    .card {
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
        margin-left: 0;
        margin-right: 0;
    }

    .main-card {
        width: 100%;
    }

    /* 모바일에서 입력 필드 최적화 */
    .input,
    .select,
    .result-textarea {
        font-size: 16px; /* iOS 줌 방지 */
    }

    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .result-actions {
        width: 100%;
        justify-content: stretch;
        flex-wrap: wrap;
    }

    .btn-secondary {
        flex: 1;
    }

    .export-dropdown {
        flex: 1;
    }

    .export-dropdown .btn-secondary {
        width: 100%;
    }

    .radio-group {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }

    .radio-label {
        padding: var(--spacing-sm) var(--spacing-md);
        flex: 1 1 auto;
        min-width: 80px;
        text-align: center;
    }

    .radio-text {
        font-size: var(--font-size-xs);
    }

    .btn-primary {
        padding: var(--spacing-md);
        font-size: var(--font-size-base);
    }

    .stats-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .stats-item {
        flex-direction: row;
        justify-content: space-between;
        width: 100%;
    }

    .history-panel {
        width: 100vw;
        max-width: 350px;
    }

    .preview-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }

    .preview-tabs::-webkit-scrollbar {
        display: none; /* Chrome, Safari */
    }

    .preview-tab {
        flex-shrink: 0;
        font-size: var(--font-size-xs);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .preview-container {
        flex-direction: column;
    }

    .preview-container.both-view .mobile-view {
        max-width: 100%;
    }

    .view-mode-toggles {
        flex-wrap: wrap;
    }

    .view-mode-btn {
        min-width: 100px;
    }

    .security-badges {
        flex-direction: column;
    }

    .security-badge {
        width: 100%;
        justify-content: center;
    }

    .security-info-btn {
        width: 100%;
        justify-content: center;
    }

    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .modal-header {
        padding: var(--spacing-lg);
    }

    .modal-title {
        font-size: var(--font-size-lg);
    }

    .modal-body {
        padding: var(--spacing-lg);
    }

    .connection-flow {
        flex-direction: column;
    }

    .flow-arrow {
        transform: rotate(90deg);
    }

    .footer {
        padding: var(--spacing-lg) 0;
    }
}

@media (max-width: 480px) {
    .input-group {
        flex-direction: column;
    }

    .toggle-btn {
        width: 100%;
    }

    .result-actions {
        flex-direction: column;
    }

    .btn-secondary,
    .export-dropdown {
        width: 100%;
    }
}

/* ===== Table of Contents (TOC) Styles ===== */
.toc-container {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.toc-container.collapsed .toc-nav {
    display: none;
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.toc-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.toc-toggle {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    padding: var(--spacing-xs);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toc-toggle:hover {
    background: var(--color-bg-input);
    color: var(--color-primary-light);
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.toc-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    border-left: 2px solid transparent;
}

.toc-link:hover {
    background: var(--color-bg-input);
    color: var(--color-primary-light);
    border-left-color: var(--color-primary);
    transform: translateX(4px);
}

.toc-link.active {
    background: var(--color-bg-input);
    color: var(--color-primary-light);
    border-left-color: var(--color-primary);
}

/* TOC heading levels */
.toc-link[data-level="1"] {
    font-weight: 600;
    font-size: var(--font-size-base);
}

.toc-link[data-level="2"] {
    padding-left: calc(var(--spacing-md) + var(--spacing-lg));
}

.toc-link[data-level="3"] {
    padding-left: calc(var(--spacing-md) + var(--spacing-xl));
    font-size: var(--font-size-xs);
}

.toc-link[data-level="4"],
.toc-link[data-level="5"],
.toc-link[data-level="6"] {
    padding-left: calc(var(--spacing-md) + var(--spacing-2xl));
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* Empty state */
.toc-empty {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-style: italic;
    padding: var(--spacing-md);
    text-align: center;
}

@media (max-width: 768px) {
    .toc-container {
        padding: var(--spacing-md);
    }

    .toc-link[data-level="2"],
    .toc-link[data-level="3"],
    .toc-link[data-level="4"],
    .toc-link[data-level="5"],
    .toc-link[data-level="6"] {
        padding-left: calc(var(--spacing-md) + (var(--level, 0) * var(--spacing-md)));
    }
}

/* ===== SEO Analysis Styles ===== */
.seo-analysis {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.seo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.seo-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.seo-overall-score {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.score-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.score-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-max {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

.seo-metrics {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.seo-metric {
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.seo-metric:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.metric-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.metric-icon {
    font-size: var(--font-size-xl);
}

.metric-name {
    flex: 1;
    font-weight: 500;
    color: var(--color-text-primary);
}

.metric-score {
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.metric-bar {
    width: 100%;
    height: 8px;
    background: var(--color-bg-secondary);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.metric-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    border-radius: 999px;
    transition: width var(--transition-slow), background var(--transition-base);
    width: 0%;
}

.metric-bar-fill.excellent {
    background: linear-gradient(90deg, var(--color-success), #34d399);
}

.metric-bar-fill.good {
    background: linear-gradient(90deg, var(--color-secondary), var(--color-secondary-light));
}

.metric-bar-fill.fair {
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.metric-bar-fill.poor {
    background: linear-gradient(90deg, var(--color-error), #f87171);
}

.metric-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

.seo-recommendations {
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.recommendations-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-md) 0;
}

.recommendations-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.recommendations-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-left: 2px solid var(--color-accent);
}

.recommendations-list li::before {
    content: '→';
    margin-right: var(--spacing-sm);
    color: var(--color-primary-light);
}

.recommendations-list.empty {
    padding: var(--spacing-md);
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
}

@media (max-width: 768px) {
    .seo-analysis {
        padding: var(--spacing-lg);
    }

    .seo-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .score-value {
        font-size: var(--font-size-2xl);
    }

    .seo-metric {
        padding: var(--spacing-md);
    }
}

/* ===== Similarity Analysis Styles ===== */
.similarity-analysis {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.similarity-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.similarity-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.similarity-overall-score {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.similarity-metrics {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.similarity-metric {
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.similarity-metric:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.detected-phrases {
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
}

.phrases-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-md) 0;
}

.phrases-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.phrases-empty {
    color: var(--color-text-muted);
    font-style: italic;
    margin: 0;
}

.phrase-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-full);
    color: #fbbf24;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

.phrase-tag:hover {
    background: rgba(245, 158, 11, 0.25);
    transform: translateY(-1px);
}

.phrase-tag.high {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.3);
    color: #f87171;
}

.phrase-tag.low {
    background: rgba(34, 197, 94, 0.15);
    border-color: rgba(34, 197, 94, 0.3);
    color: #4ade80;
}

.similarity-recommendations {
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-secondary);
    margin-bottom: var(--spacing-xl);
}

.similarity-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.btn-analyze {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.btn-analyze:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-analyze:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-analyze .btn-icon {
    font-size: var(--font-size-lg);
}

.analyze-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

.similarity-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-2xl);
}

.similarity-loading .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.similarity-loading-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

@media (max-width: 768px) {
    .similarity-analysis {
        padding: var(--spacing-lg);
    }

    .similarity-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .similarity-metric {
        padding: var(--spacing-md);
    }

    .btn-analyze {
        width: 100%;
        justify-content: center;
    }
}

/* ===== Version Compare Modal Styles ===== */
.modal-large {
    max-width: 1200px;
    width: 95%;
}

.compare-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.compare-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.compare-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.compare-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.compare-timestamp {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.compare-textarea {
    width: 100%;
    min-height: 400px;
    padding: var(--spacing-md);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    resize: vertical;
}

.compare-stats {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--spacing-sm);
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
}

.compare-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

.diff-view {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.diff-view h4 {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
}

.diff-content {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.8;
    white-space: pre-wrap;
    word-break: break-word;
}

.diff-added {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
    padding: 2px 4px;
    border-radius: 3px;
}

.diff-removed {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-error);
    padding: 2px 4px;
    border-radius: 3px;
    text-decoration: line-through;
}

.diff-line {
    padding: 4px 0;
}

@media (max-width: 768px) {
    .modal-large {
        width: 98%;
        max-height: 90vh;
    }

    .compare-container {
        grid-template-columns: 1fr;
    }

    .compare-textarea {
        min-height: 250px;
    }

    .compare-actions {
        flex-direction: column;
    }

    .compare-actions button {
        width: 100%;
    }
}

/* ===== Keyword Extraction Styles ===== */
.extract-btn {
    min-width: 80px;
    white-space: nowrap;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.suggested-keywords {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    animation: slideDown var(--transition-base);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.suggested-keywords-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.keyword-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.keyword-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.keyword-chip:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.keyword-chip.selected {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.keyword-count {
    font-size: var(--font-size-xs);
    opacity: 0.7;
}

/* ===== Formatting Toolbar Styles ===== */
.formatting-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toolbar-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    white-space: nowrap;
}

.toolbar-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.toolbar-btn:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: translateY(-1px);
}

.toolbar-btn:active {
    transform: translateY(0);
}

.toolbar-btn code {
    font-size: var(--font-size-xs);
    background: transparent;
    color: inherit;
    padding: 0;
}

.apply-class-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    min-width: auto;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--color-border);
}

.class-selector {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    cursor: pointer;
    min-width: 150px;
    height: 32px;
}

.class-selector:focus {
    border-color: var(--color-primary);
    outline: none;
}

.class-selector option {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.class-selector optgroup {
    font-weight: 600;
    color: var(--color-text-muted);
}

/* ===== Class Manager Styles ===== */
.class-manager {
    padding: var(--spacing-lg);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.class-manager-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.class-manager-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.btn-add-class {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-add-class:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

.custom-class-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    max-height: 300px;
    overflow-y: auto;
}

.custom-class-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.custom-class-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.class-item-preview {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.class-item-info {
    flex: 1;
    min-width: 0;
}

.class-item-name {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.class-item-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.class-item-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.class-item-btn {
    padding: var(--spacing-xs);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
}

.class-item-btn:hover {
    background: var(--color-bg-input);
    color: var(--color-text-primary);
}

.class-item-btn.delete:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--color-error);
    color: var(--color-error);
}

/* New Class Form */
.new-class-form {
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 2px dashed var(--color-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    animation: slideDown var(--transition-base);
}

.new-class-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.new-class-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
}

.new-class-input:focus {
    border-color: var(--color-primary);
    outline: none;
}

.new-class-css {
    width: 100%;
    min-height: 120px;
    padding: var(--spacing-md);
    background: rgba(13, 13, 20, 0.8);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: #a9dc76;
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    resize: vertical;
    margin-bottom: var(--spacing-md);
}

.new-class-css:focus {
    border-color: var(--color-primary);
    outline: none;
}

.new-class-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.btn-save-class {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-success);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-save-class:hover {
    background: #059669;
    transform: translateY(-1px);
}

.btn-cancel-class {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-cancel-class:hover {
    border-color: var(--color-text-secondary);
}

.class-manager-info {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(139, 92, 246, 0.05);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-sm);
}

.css-editor-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-lg) 0;
}

.custom-class-empty {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* Inline class styles for preview */
.markdown-preview-content [class^="inline-"] {
    display: inline;
}

.markdown-preview-content .inline-highlight {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2) 0%, rgba(139, 92, 246, 0.1) 100%);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--color-primary);
}

.markdown-preview-content .inline-mark {
    background: linear-gradient(180deg, transparent 50%, #fef08a 50%);
    padding: 0 2px;
}

.markdown-preview-content .inline-bold {
    font-weight: 700;
    color: #1a1a2e;
}

.markdown-preview-content .inline-accent {
    color: #e94560;
    font-weight: 600;
}

/* Responsive styles for toolbar */
@media (max-width: 768px) {
    .formatting-toolbar {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .toolbar-group {
        width: 100%;
        flex-wrap: wrap;
    }

    .toolbar-label {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }

    .toolbar-divider {
        display: none;
    }

    .class-selector {
        flex: 1;
        min-width: 120px;
    }

    .new-class-row {
        flex-direction: column;
    }

    .class-manager-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }

    .btn-add-class {
        width: 100%;
    }
}

/* ===========================
   Google AdSense Styles
   =========================== */

/* 왼쪽 사이드바 광고 */
.ad-sidebar {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
}

.ad-left {
    left: 20px;
}

.ad-sticky {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    padding: var(--spacing-sm);
    width: 160px;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-sticky ins {
    width: 100%;
}

/* 로컬 테스트용 플레이스홀더 */
.ad-placeholder {
    width: 160px;
    height: 600px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.2));
    border: 2px dashed var(--color-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.ad-placeholder-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* 하단 광고용 플레이스홀더 */
.ad-container .ad-placeholder {
    width: 100%;
    height: 100px;
    max-width: 728px;
}

/* 배포 시: 아래 주석을 해제하면 플레이스홀더 숨김
.ad-placeholder {
    display: none;
}
*/

/* 하단 배너 광고 */
.ad-container {
    width: 100%;
    max-width: 950px;
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-sm);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    text-align: center;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-container ins {
    width: 100%;
}

.ad-bottom {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

/* 화면이 좁을 때 사이드바 광고 숨김 (1400px 이하) */
@media (max-width: 1400px) {
    .ad-sidebar {
        display: none;
    }
}

/* 모바일에서 광고 컨테이너 최적화 */
@media (max-width: 768px) {
    .ad-container {
        margin: var(--spacing-md) var(--spacing-sm);
        padding: var(--spacing-xs);
        min-height: 60px;
        border-radius: var(--radius-sm);
    }

    .ad-container .ad-placeholder {
        height: 60px;
    }

    .ad-bottom {
        margin-top: var(--spacing-md);
        margin-bottom: var(--spacing-sm);
    }
}

/* 모바일에서 하단 광고 여백 조정 */
@media (max-width: 768px) {
    .ad-container {
        margin: var(--spacing-md) auto;
        padding: var(--spacing-xs);
        min-height: 80px;
    }

    .ad-bottom {
        margin-top: var(--spacing-lg);
        margin-bottom: var(--spacing-md);
    }
}

/* ===========================
   메인 네비게이션 탭
   =========================== */
.main-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xs);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.main-nav-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.main-nav-tab:hover {
    color: var(--color-text-primary);
    background: rgba(139, 92, 246, 0.1);
}

.main-nav-tab.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-icon {
    font-size: var(--font-size-lg);
}

.main-section {
    animation: fadeInUp 0.3s ease-out;
}

.main-section.hidden {
    display: none;
}

/* ===========================
   유사도 검사 섹션 스타일
   =========================== */
.section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.section-desc {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.similarity-textarea {
    min-height: 200px;
    resize: vertical;
    font-family: inherit;
    line-height: 1.8;
}

.textarea-stats {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.stats-divider {
    color: var(--color-border);
}

/* AI 설정 섹션 */
.ai-settings-section {
    margin-top: var(--spacing-md);
}

.ai-settings-card {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(6, 182, 212, 0.05));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.ai-settings-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.ai-settings-row:last-child {
    margin-bottom: 0;
}

.ai-settings-item {
    flex: 1;
}

.ai-settings-item.full-width {
    flex: 1 1 100%;
}

.ai-settings-item .label {
    margin-bottom: var(--spacing-sm);
}

.use-same-key-btn {
    font-size: var(--font-size-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    white-space: nowrap;
}

/* 분석 유형 배지 */
.analysis-type-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: 9999px;
    background: var(--color-bg-input);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.analysis-type-badge.ai-analysis {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.2));
    color: var(--color-primary-light);
    border-color: var(--color-primary);
}

/* SEO 추천 제목 스타일 */
.generate-titles-btn {
    font-size: var(--font-size-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    white-space: nowrap;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
}

.generate-titles-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.suggested-titles {
    margin-top: var(--spacing-md);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(6, 182, 212, 0.05));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.suggested-titles-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.suggested-titles-label {
    font-weight: 600;
    color: var(--color-text-primary);
}

.close-titles-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    font-size: var(--font-size-lg);
    line-height: 1;
    transition: color var(--transition-fast);
}

.close-titles-btn:hover {
    color: var(--color-text-primary);
}

.titles-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.title-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.title-item:hover {
    background: var(--color-bg-input);
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.title-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: 50%;
    flex-shrink: 0;
}

.title-text {
    flex: 1;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.titles-hint {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-align: center;
}

.titles-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    color: var(--color-text-muted);
}

.titles-loading .spinner-small {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* AI 분석 안내 배너 */
.ai-info-banner {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(6, 182, 212, 0.1));
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.ai-info-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.ai-info-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.ai-info-text strong {
    color: var(--color-primary-light);
}

@media (max-width: 768px) {
    .ai-settings-row {
        flex-direction: column;
    }

    .ai-settings-item {
        width: 100%;
    }

    .ai-info-banner {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
}

/* 점수 카드 */
.similarity-score-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(6, 182, 212, 0.1));
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.score-circle {
    position: relative;
    width: 140px;
    height: 140px;
    flex-shrink: 0;
}

.score-circle svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-bg {
    fill: none;
    stroke: var(--color-border);
    stroke-width: 8;
}

.score-fill {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 1s ease-out;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1;
}

.score-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.score-details {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.score-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.item-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.item-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* 감지된 표현 섹션 */
.detected-section,
.suggestions-section {
    margin-bottom: var(--spacing-xl);
}

.detected-title,
.suggestions-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.detected-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.detected-phrase {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

.empty-message {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.suggestions-list {
    list-style: none;
    padding: 0;
}

.suggestions-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--color-border);
}

.suggestions-list li:last-child {
    border-bottom: none;
}

.suggestions-list li::before {
    content: '💡';
    position: absolute;
    left: 0;
}

/* 모바일 대응 */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .main-nav-tab {
        justify-content: center;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .similarity-score-card {
        flex-direction: column;
        text-align: center;
    }

    .score-details {
        grid-template-columns: 1fr;
        width: 100%;
    }

    .similarity-textarea {
        min-height: 150px;
    }
}

/* ===========================
   설정 섹션 스타일
   =========================== */
.settings-section {
    margin: var(--spacing-lg) auto;
    max-width: 800px;
    padding: 0 var(--spacing-md);
}

.settings-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.settings-toggle:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.settings-icon {
    font-size: 1.1em;
}

.settings-arrow {
    font-size: 0.8em;
    transition: transform 0.2s ease;
}

.settings-panel {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.settings-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.settings-item {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s ease;
}

.settings-item:hover {
    background: var(--color-surface-hover);
}

.settings-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-text);
}

.setting-icon {
    font-size: 1.1em;
}

.setting-text {
    font-size: var(--font-size-sm);
}

.setting-hint {
    width: 100%;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: calc(-1 * var(--spacing-xs));
    padding-left: calc(var(--spacing-sm) + 1.1em + var(--spacing-sm));
}

/* 토글 스위치 스타일 */
.settings-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch {
    position: relative;
    width: 48px;
    height: 26px;
    background: var(--color-border);
    border-radius: 13px;
    transition: background 0.3s ease;
    flex-shrink: 0;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.settings-checkbox:checked + .toggle-switch {
    background: var(--color-primary);
}

.settings-checkbox:checked + .toggle-switch::after {
    transform: translateX(22px);
}

.settings-checkbox:focus + .toggle-switch {
    box-shadow: 0 0 0 2px var(--color-primary-light);
}

/* 설정 알림 */
.settings-notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.settings-notification.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

/* 모바일 설정 대응 */
@media (max-width: 768px) {
    .settings-section {
        padding: 0 var(--spacing-sm);
    }

    .settings-item {
        padding: var(--spacing-sm);
    }

    .setting-hint {
        padding-left: 0;
    }
}