/* ============================================
   AideExcel - Design System
   Light Mode Minimaliste Vert
   ============================================ */

:root {
    /* Couleurs principales - Vert Excel */
    --primary-50: #f0fdf4;
    --primary-100: #dcfce7;
    --primary-200: #bbf7d0;
    --primary-300: #86efac;
    --primary-400: #4ade80;
    --primary-500: #217346;
    --primary-600: #1a5c38;
    --primary-700: #14462a;
    --primary-800: #0f2f1d;
    --primary-900: #0a1f13;

    /* Fonds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;

    /* Textes */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    /* Bordures */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    /* États */
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

/* ============ BASE ============ */

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
}

a {
    color: var(--primary-500);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-600);
}

code, pre, .font-mono {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

/* ============ FORMULA IMAGE ============ */

.formula-image {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.formula-image::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
}

.formula-image .formula-text {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    z-index: 1;
}

/* ============ ARTICLE CARD ============ */

.article-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.article-card:hover {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
    border-color: var(--primary-200);
}

.article-card-image {
    height: 160px;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-400) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.article-card-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.article-card-image .formula-name {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 1.75rem;
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.article-card-body {
    padding: 1.25rem;
}

.article-card-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-50);
    color: var(--primary-700);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.article-card-title a {
    color: inherit;
}

.article-card-title a:hover {
    color: var(--primary-500);
}

.article-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============ SYNTAX BOX ============ */

.syntax-box {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.syntax-box .syntax {
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-700);
    margin-bottom: 0.75rem;
}

.syntax-box .explanation {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============ EXAMPLE CARDS ============ */

.example-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.example-card .example-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.example-card .example-title i {
    color: var(--primary-500);
}

.example-card .example-formula {
    font-family: 'SF Mono', 'Monaco', monospace;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
    color: var(--primary-600);
    font-weight: 500;
    font-size: 0.95rem;
}

.example-card .example-data {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.example-card .example-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.example-card .example-result {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--success);
    color: white;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

/* ============ TIP ITEMS ============ */

.tip-item {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--primary-50);
    border-left: 3px solid var(--primary-500);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-bottom: 0.75rem;
}

.tip-item i {
    color: var(--primary-500);
    font-size: 1.1rem;
    margin-top: 0.1rem;
}

.tip-item p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

/* ============ ERROR CARDS ============ */

.error-card {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.15);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
}

.error-card .error-type {
    font-family: 'SF Mono', 'Monaco', monospace;
    font-weight: 600;
    color: var(--error);
    margin-bottom: 0.35rem;
    font-size: 0.95rem;
}

.error-card .error-cause {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.error-card .error-solution {
    color: var(--success);
    font-size: 0.85rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.error-card .error-solution i {
    margin-top: 0.2rem;
}

/* ============ RELATED FORMULAS ============ */

.related-formula-pill {
    display: inline-block;
    padding: 0.4rem 0.85rem;
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-full);
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-600);
    margin: 0.25rem;
    transition: all 0.2s ease;
}

.related-formula-pill:hover {
    background: var(--primary-500);
    border-color: var(--primary-500);
    color: white;
}

/* ============ DIFFICULTY BADGE ============ */

.difficulty-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.difficulty-badge.beginner,
.difficulty-badge.debutant {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.difficulty-badge.intermediate,
.difficulty-badge.intermediaire {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.difficulty-badge.advanced,
.difficulty-badge.avance {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

/* ============ USE CASES ============ */

.use-case-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-light);
}

.use-case-item:last-child {
    border-bottom: none;
}

.use-case-item i {
    color: var(--primary-500);
    margin-top: 0.2rem;
}

.use-case-item span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============ PROSE CONTENT (Markdown Rendering) ============ */

.prose {
    font-size: 1rem;
    line-height: 1.75;
}

.prose h1 {
    font-size: 2rem;
    color: var(--primary-600);
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-100);
}

.prose h2 {
    font-size: 1.5rem;
    color: var(--primary-600);
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-100);
}

.prose h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
}

.prose h4 {
    font-size: 1.125rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.prose h5, .prose h6 {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.prose p {
    margin-bottom: 1rem;
    line-height: 1.75;
    color: var(--text-secondary);
}

.prose ul, .prose ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.prose ul {
    list-style-type: disc;
}

.prose ol {
    list-style-type: decimal;
}

.prose li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.prose li > ul, .prose li > ol {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

.prose strong, .prose b {
    font-weight: 600;
    color: var(--text-primary);
}

.prose em, .prose i {
    font-style: italic;
}

.prose blockquote {
    border-left: 4px solid var(--primary-500);
    padding-left: 1rem;
    margin: 1.5rem 0;
    background: var(--primary-50);
    padding: 1rem 1.25rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.prose blockquote p {
    margin-bottom: 0;
}

.prose code {
    background: var(--primary-50);
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875em;
    color: var(--primary-700);
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

.prose pre {
    background: var(--bg-tertiary);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.prose pre code {
    background: transparent;
    color: var(--text-primary);
    padding: 0;
    font-size: 0.9rem;
}

.prose hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

.prose a {
    color: var(--primary-500);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.prose a:hover {
    color: var(--primary-600);
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.9rem;
}

.prose th, .prose td {
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    text-align: left;
}

.prose th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.prose td {
    color: var(--text-secondary);
}

.prose tr:nth-child(even) td {
    background: var(--bg-secondary);
}

.prose img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

/* ============ FORMULA CODE BLOCK ============ */

.formula-code {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-left: 4px solid var(--primary-500);
    padding: 1rem 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-family: 'SF Mono', 'Monaco', monospace;
    overflow-x: auto;
}

/* ============ LINE CLAMP ============ */

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============ HOVER EFFECTS ============ */

.hover-lift {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.12);
}

/* ============ SEARCH RESULTS ============ */

#search-results {
    max-height: 400px;
    overflow-y: auto;
}

#search-results:empty {
    display: none;
}

/* ============ CUSTOM SCROLLBAR ============ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ============ SKELETON LOADING ============ */

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============ PRINT STYLES ============ */

@media print {
    header, footer, nav, .no-print {
        display: none !important;
    }

    .formula-code, .syntax-box {
        background: #f9fafb !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}