/* ===== CSS VARIABLES ===== */
:root {
    /* Colors - Bold, editorial palette */
    --bg-primary: #0D0D0D;
    --bg-secondary: #1A1A1A;
    --bg-card: #141414;
    --bg-card-hover: #1F1F1F;
    
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0A0;
    --text-muted: #666666;
    
    --accent-primary: #FF6B35;
    --accent-secondary: #FFD166;
    --accent-tertiary: #06D6A0;
    
    /* Category colors */
    --cat-geopolitique: #FF6B35;
    --cat-economie: #FFD166;
    --cat-institutions: #06D6A0;
    --cat-religions: #118AB2;
    --cat-climat: #073B4C;
    --cat-histoire: #EF476F;
    --cat-guerres: #7B2CBF;
    --cat-revolutions: #E63946;
    --cat-geozarbi: #2EC4B6;
    --cat-personnages: #F72585;
    --cat-corps: #4CC9F0;
    --cat-physique: #4361EE;
    --cat-sante: #3A0CA3;
    --cat-espace: #560BAD;
    --cat-tech: #7209B7;
    --cat-tv: #B5179E;
    --cat-cinema: #F15BB5;
    --cat-musique: #00BBF9;
    --cat-internet: #00F5D4;
    --cat-sport: #FEE440;
    --cat-droit: #9B5DE5;
    --cat-geo: #F15BB5;
    --cat-art: #FB8500;
    --cat-philo: #8338EC;
    --cat-argent: #06D6A0;
    
    /* Typography */
    --font-display: 'Clash Display', sans-serif;
    --font-body: 'Satoshi', sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* Noise texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: 1000;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ===== HEADER ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) var(--space-xl);
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: baseline;
    gap: 2px;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

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

.logo-g {
    color: var(--accent-primary);
    font-size: 2rem;
}

.nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link svg {
    opacity: 0.7;
}

/* ===== MAIN ===== */
.main {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl);
}

/* ===== HERO ===== */
.hero {
    text-align: center;
    padding: var(--space-3xl) 0;
    margin-bottom: var(--space-2xl);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

.hero-highlight {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ===== CATEGORIES GRID ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-md);
}

@media (max-width: 1200px) {
    .categories-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 900px) {
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== CATEGORY CARD ===== */
.category-card {
    position: relative;
    aspect-ratio: 1;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--card-color) 0%, transparent 60%);
    opacity: 0.15;
    transition: opacity var(--transition-normal);
}

.category-card::after {
    content: attr(data-number);
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--card-color);
    opacity: 0.5;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--card-color);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--card-color);
}

.category-card:hover::before {
    opacity: 0.25;
}

.category-card__title {
    position: relative;
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.2;
    z-index: 1;
}

.category-card__count {
    position: relative;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-xs);
    z-index: 1;
}

/* ===== ARTICLES GRID (same as categories) ===== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-md);
}

@media (max-width: 1200px) {
    .articles-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 900px) {
    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.article-card {
    position: relative;
    aspect-ratio: 1;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--card-color) 0%, transparent 60%);
    opacity: 0.1;
    transition: opacity var(--transition-normal);
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.article-card:hover::before {
    opacity: 0.2;
}

.article-card__number {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.article-card__title {
    position: relative;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.3;
    z-index: 1;
}

/* ===== PAGE HEADER (for category & article pages) ===== */
.page-header {
    margin-bottom: var(--space-2xl);
}

.page-header__breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.page-header__breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.page-header__breadcrumb a:hover {
    color: var(--accent-primary);
}

.page-header__breadcrumb svg {
    width: 16px;
    height: 16px;
    opacity: 0.5;
}

.page-header__title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.page-header__subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-top: var(--space-sm);
}

/* ===== ARTICLE PAGE ===== */
.article {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.article-header__category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-primary);
    margin-bottom: var(--space-md);
}

.article-header__title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
}

.article-header__actions {
    display: flex;
    gap: var(--space-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn--outline {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-secondary);
}

.btn--outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn--outline.active {
    border-color: var(--accent-primary);
    background: rgba(255, 107, 53, 0.1);
    color: var(--accent-primary);
}

/* ===== ARTICLE ITEM ===== */
.article-item {
    margin-bottom: var(--space-2xl);
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--accent-primary);
}

.article-item__header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.article-item__number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--bg-primary);
}

.article-item__title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.2;
}

.article-item__hook {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    padding-left: var(--space-lg);
    border-left: 2px solid rgba(255, 255, 255, 0.1);
}

.article-item__definition {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-secondary);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
}

.article-item__definition::before {
    content: '📚 ';
}

/* ===== BOOKMARKS PAGE ===== */
.bookmarks-empty {
    text-align: center;
    padding: var(--space-3xl);
}

.bookmarks-empty__icon {
    font-size: 4rem;
    margin-bottom: var(--space-lg);
    opacity: 0.3;
}

.bookmarks-empty__title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.bookmarks-empty__text {
    color: var(--text-secondary);
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: var(--space-3xl);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-card,
.article-card {
    animation: fadeInUp 0.5s ease backwards;
}

.category-card:nth-child(1), .article-card:nth-child(1) { animation-delay: 0.02s; }
.category-card:nth-child(2), .article-card:nth-child(2) { animation-delay: 0.04s; }
.category-card:nth-child(3), .article-card:nth-child(3) { animation-delay: 0.06s; }
.category-card:nth-child(4), .article-card:nth-child(4) { animation-delay: 0.08s; }
.category-card:nth-child(5), .article-card:nth-child(5) { animation-delay: 0.10s; }
.category-card:nth-child(6), .article-card:nth-child(6) { animation-delay: 0.12s; }
.category-card:nth-child(7), .article-card:nth-child(7) { animation-delay: 0.14s; }
.category-card:nth-child(8), .article-card:nth-child(8) { animation-delay: 0.16s; }
.category-card:nth-child(9), .article-card:nth-child(9) { animation-delay: 0.18s; }
.category-card:nth-child(10), .article-card:nth-child(10) { animation-delay: 0.20s; }
.category-card:nth-child(11), .article-card:nth-child(11) { animation-delay: 0.22s; }
.category-card:nth-child(12), .article-card:nth-child(12) { animation-delay: 0.24s; }
.category-card:nth-child(13), .article-card:nth-child(13) { animation-delay: 0.26s; }
.category-card:nth-child(14), .article-card:nth-child(14) { animation-delay: 0.28s; }
.category-card:nth-child(15), .article-card:nth-child(15) { animation-delay: 0.30s; }
.category-card:nth-child(16), .article-card:nth-child(16) { animation-delay: 0.32s; }
.category-card:nth-child(17), .article-card:nth-child(17) { animation-delay: 0.34s; }
.category-card:nth-child(18), .article-card:nth-child(18) { animation-delay: 0.36s; }
.category-card:nth-child(19), .article-card:nth-child(19) { animation-delay: 0.38s; }
.category-card:nth-child(20), .article-card:nth-child(20) { animation-delay: 0.40s; }
.category-card:nth-child(21), .article-card:nth-child(21) { animation-delay: 0.42s; }
.category-card:nth-child(22), .article-card:nth-child(22) { animation-delay: 0.44s; }
.category-card:nth-child(23), .article-card:nth-child(23) { animation-delay: 0.46s; }
.category-card:nth-child(24), .article-card:nth-child(24) { animation-delay: 0.48s; }
.category-card:nth-child(25), .article-card:nth-child(25) { animation-delay: 0.50s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .header {
        padding: var(--space-md);
    }
    
    .main {
        padding: var(--space-md);
    }
    
    .hero {
        padding: var(--space-xl) 0;
    }
    
    .nav-link span {
        display: none;
    }
    
    .article-item {
        padding: var(--space-md);
    }
}