/* ============================================
   TUTORIALHUB - Main CSS (Purple-Blue Theme)
   ============================================ */

:root {
    --purple-50: #faf5ff;
    --purple-100: #f3e8ff;
    --purple-200: #e9d5ff;
    --purple-300: #d8b4fe;
    --purple-400: #c084fc;
    --purple-500: #a855f7;
    --purple-600: #9333ea;
    --purple-700: #7c3aed;
    --purple-800: #6b21a8;
    --purple-900: #581c87;

    --blue-400: #60a5fa;
    --blue-500: #3b82f6;
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;

    --dark-900: #0f0a1a;
    --dark-800: #150e2a;
    --dark-700: #1e1535;
    --dark-600: #2a1f4a;

    --text-primary: #f0e6ff;
    --text-secondary: #c4aee0;
    --text-muted: #8b7aa8;

    --border-color: rgba(168, 85, 247, 0.15);
    --card-bg: rgba(30, 21, 53, 0.8);
    --card-hover: rgba(42, 31, 74, 0.9);

    --gradient-main: linear-gradient(135deg, #7c3aed 0%, #2563eb 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(37, 99, 235, 0.1) 100%);

    --font-main: 'Plus Jakarta Sans', sans-serif;
    --font-code: 'Fira Code', monospace;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.4);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-main);
    background: var(--dark-900);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark-800); }
::-webkit-scrollbar-thumb { background: var(--purple-700); border-radius: 3px; }

/* ── UTILITIES ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.text-gradient {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ── NAVBAR ── */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(15, 10, 26, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}
.navbar.scrolled { background: rgba(15, 10, 26, 0.98); }
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    height: 64px; display: flex; align-items: center; gap: 32px;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none; flex-shrink: 0;
}
.logo-icon {
    width: 36px; height: 36px; border-radius: 10px;
    background: var(--gradient-main);
    display: flex; align-items: center; justify-content: center;
    font-size: 14px; color: white;
}
.logo-text { font-weight: 700; font-size: 1.1rem; color: var(--text-primary); }
.nav-links {
    display: flex; gap: 8px; margin-left: auto; align-items: center;
}
.nav-links a {
    color: var(--text-secondary); text-decoration: none;
    padding: 8px 16px; border-radius: 8px; font-size: 0.9rem; font-weight: 500;
    transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
    background: rgba(124, 58, 237, 0.15);
}
.nav-links a.active { color: var(--purple-400); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: var(--transition); }
.nav-mobile { display: none; flex-direction: column; background: var(--dark-800); border-top: 1px solid var(--border-color); padding: 16px 24px; gap: 4px; }
.nav-mobile a { color: var(--text-secondary); text-decoration: none; padding: 10px 16px; border-radius: 8px; font-weight: 500; }
.nav-mobile a:hover { background: rgba(124,58,237,.15); color: var(--text-primary); }
.nav-mobile.open { display: flex; }

/* ── HERO ── */
.hero {
    position: relative; padding: 140px 24px 80px;
    min-height: 100vh; display: flex; align-items: center;
    overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-orb {
    position: absolute; border-radius: 50%;
    filter: blur(80px); opacity: 0.5;
    animation: orbFloat 8s ease-in-out infinite;
}
.hero-orb-1 { width: 500px; height: 500px; top: -100px; left: -100px; background: radial-gradient(circle, #7c3aed, transparent); animation-delay: 0s; }
.hero-orb-2 { width: 400px; height: 400px; top: 100px; right: -100px; background: radial-gradient(circle, #2563eb, transparent); animation-delay: 3s; }
.hero-orb-3 { width: 300px; height: 300px; bottom: -50px; left: 40%; background: radial-gradient(circle, #5b21b6, transparent); animation-delay: 6s; }
.hero-grid {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(124,58,237,0.05) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(124,58,237,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
}
@keyframes orbFloat { 0%,100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-30px) scale(1.05); } }

.hero-container { position: relative; max-width: 800px; margin: 0 auto; text-align: center; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(124,58,237,0.15); border: 1px solid rgba(168,85,247,0.3);
    color: var(--purple-300); padding: 8px 20px; border-radius: 100px;
    font-size: 0.85rem; font-weight: 600; margin-bottom: 28px;
    animation: fadeInUp 0.6s ease both;
}
.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800;
    line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 20px;
    animation: fadeInUp 0.6s 0.1s ease both;
}
.hero-desc {
    font-size: 1.1rem; color: var(--text-secondary);
    max-width: 550px; margin: 0 auto 36px;
    animation: fadeInUp 0.6s 0.2s ease both;
}
.hero-actions {
    display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
    animation: fadeInUp 0.6s 0.3s ease both;
}
.hero-stats {
    display: flex; align-items: center; gap: 24px; justify-content: center;
    margin-top: 48px; animation: fadeInUp 0.6s 0.4s ease both;
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-number { font-size: 1.5rem; font-weight: 800; color: var(--text-primary); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.stat-divider { width: 1px; height: 36px; background: var(--border-color); }

/* ── BUTTONS ── */
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius);
    background: var(--gradient-main);
    color: white; font-weight: 600; font-size: 0.95rem;
    text-decoration: none; border: none; cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(124, 58, 237, 0.5); }
.btn-outline {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius);
    background: transparent; border: 1px solid rgba(168, 85, 247, 0.4);
    color: var(--purple-300); font-weight: 600; font-size: 0.95rem;
    text-decoration: none; cursor: pointer; transition: var(--transition);
}
.btn-outline:hover { background: rgba(124, 58, 237, 0.1); border-color: var(--purple-500); }

/* ── SECTIONS ── */
.section-categories, .section-tutorials {
    padding: 80px 0;
}
.section-header {
    display: flex; align-items: flex-end; justify-content: space-between;
    margin-bottom: 40px; flex-wrap: wrap; gap: 12px;
}
.section-title {
    font-size: 1.8rem; font-weight: 800; letter-spacing: -0.02em;
}
.section-sub { color: var(--text-muted); font-size: 0.95rem; margin-top: 4px; }
.section-link {
    color: var(--purple-400); text-decoration: none; font-weight: 600;
    font-size: 0.9rem; display: flex; align-items: center; gap: 6px;
    transition: var(--transition);
}
.section-link:hover { color: var(--purple-300); gap: 10px; }

/* ── CATEGORIES GRID ── */
.categories-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}
.category-card {
    display: flex; align-items: center; gap: 14px;
    padding: 18px 20px; border-radius: var(--radius);
    background: var(--card-bg); border: 1px solid var(--border-color);
    text-decoration: none; color: var(--text-primary);
    transition: var(--transition);
}
.category-card:hover { background: var(--card-hover); border-color: rgba(168,85,247,.4); transform: translateY(-2px); }
.category-icon {
    width: 42px; height: 42px; border-radius: 10px; flex-shrink: 0;
    background: var(--gradient-subtle); border: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: center;
    color: var(--purple-400); font-size: 1rem;
}
.category-info h3 { font-size: 0.95rem; font-weight: 600; }
.category-info span { font-size: 0.8rem; color: var(--text-muted); }
.category-arrow { margin-left: auto; color: var(--text-muted); font-size: 0.8rem; transition: var(--transition); }
.category-card:hover .category-arrow { color: var(--purple-400); transform: translateX(4px); }

/* ── TUTORIALS GRID ── */
.tutorials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}
.tutorial-card {
    border-radius: var(--radius-lg); overflow: hidden;
    background: var(--card-bg); border: 1px solid var(--border-color);
    transition: var(--transition); display: flex; flex-direction: column;
}
.tutorial-card:hover { transform: translateY(-4px); border-color: rgba(168,85,247,.4); box-shadow: var(--shadow); }
.card-thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.tutorial-card:hover .card-thumb img { transform: scale(1.05); }
.card-thumb-placeholder {
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, rgba(124,58,237,0.2), rgba(37,99,235,0.2));
    display: flex; align-items: center; justify-content: center;
}
.thumb-icon { font-size: 2.5rem; color: var(--purple-400); opacity: 0.5; }
.card-category {
    position: absolute; top: 12px; left: 12px;
    background: var(--gradient-main); color: white;
    padding: 4px 12px; border-radius: 100px; font-size: 0.75rem; font-weight: 600;
}
.card-body { padding: 20px 22px; flex: 1; display: flex; flex-direction: column; gap: 10px; }
.card-meta { display: flex; gap: 14px; flex-wrap: wrap; }
.card-date, .card-read {
    font-size: 0.78rem; color: var(--text-muted);
    display: flex; align-items: center; gap: 5px;
}
.card-title { font-size: 1rem; font-weight: 700; line-height: 1.4; }
.card-title a { text-decoration: none; color: var(--text-primary); transition: var(--transition); }
.card-title a:hover { color: var(--purple-300); }
.card-excerpt { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; flex: 1; }
.card-btn {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--purple-400); text-decoration: none;
    font-size: 0.85rem; font-weight: 600;
    transition: var(--transition); margin-top: auto;
}
.card-btn:hover { color: var(--purple-300); gap: 10px; }

/* ── PAGE HEADER ── */
.page-header {
    position: relative; padding: 120px 24px 60px;
    overflow: hidden; text-align: center;
    border-bottom: 1px solid var(--border-color);
}
.page-header-bg { position: absolute; inset: 0; pointer-events: none; }
.page-title { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; letter-spacing: -0.02em; }
.page-subtitle { color: var(--text-muted); margin-top: 8px; font-size: 0.95rem; }

/* ── FILTER BAR ── */
.filter-bar { margin-bottom: 0; }
.filter-form { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.search-box {
    position: relative; flex: 1; min-width: 200px;
}
.search-box i { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); }
.search-box input {
    width: 100%; padding: 10px 14px 10px 40px;
    background: var(--dark-700); border: 1px solid var(--border-color);
    color: var(--text-primary); border-radius: var(--radius);
    font-family: var(--font-main); font-size: 0.9rem;
    transition: var(--transition);
}
.search-box input:focus { outline: none; border-color: var(--purple-500); }
.filter-select-wrap select {
    padding: 10px 16px; background: var(--dark-700); border: 1px solid var(--border-color);
    color: var(--text-primary); border-radius: var(--radius);
    font-family: var(--font-main); font-size: 0.9rem; cursor: pointer;
}

/* ── EMPTY STATE ── */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state i { font-size: 3rem; margin-bottom: 16px; color: var(--purple-700); display: block; }
.empty-state a { color: var(--purple-400); }

/* ── PAGINATION ── */
.pagination-wrap { display: flex; justify-content: center; margin-top: 48px; }
.pagination { display: flex; gap: 6px; list-style: none; }
.pagination .page-item .page-link {
    display: flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border-radius: var(--radius);
    background: var(--dark-700); border: 1px solid var(--border-color);
    color: var(--text-secondary); text-decoration: none;
    font-size: 0.9rem; transition: var(--transition);
}
.pagination .page-item.active .page-link { background: var(--gradient-main); border-color: transparent; color: white; }
.pagination .page-item .page-link:hover { background: rgba(124,58,237,.2); color: var(--text-primary); }

/* ── FOOTER ── */
.footer {
    background: var(--dark-800); border-top: 1px solid var(--border-color);
    padding: 48px 24px;
}
.footer-container { max-width: 600px; margin: 0 auto; text-align: center; display: flex; flex-direction: column; gap: 16px; align-items: center; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem; }
.footer-desc { color: var(--text-muted); font-size: 0.9rem; }
.footer-socials { display: flex; gap: 16px; }
.footer-socials a {
    width: 40px; height: 40px; border-radius: 10px;
    background: var(--dark-700); border: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted); text-decoration: none; transition: var(--transition);
}
.footer-socials a:hover { background: var(--gradient-main); color: white; border-color: transparent; }
.footer-copy { color: var(--text-muted); font-size: 0.82rem; }

/* ── ANIMATIONS ── */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; margin-left: auto; }
    .hero { padding: 120px 20px 60px; }
    .tutorials-grid { grid-template-columns: 1fr; }
    .categories-grid { grid-template-columns: 1fr 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
}