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

:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;
  --accent: #06b6d4;
  --accent-light: #ecfeff;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --gradient-1: linear-gradient(135deg, #6366f1, #8b5cf6);
  --gradient-2: linear-gradient(135deg, #06b6d4, #6366f1);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #334155;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --primary-light: #1e1b4b;
  --accent-light: #0f3b3e;
  --success-light: #0f3a2c;
  --warning-light: #3b2f0a;
  --danger-light: #3b1010;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
}

html { scroll-behavior: smooth; }

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

a { color: var(--primary); text-decoration: none; }

/* ===== NAVBAR ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  transition: background var(--transition), border var(--transition);
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  font-size: 1.25rem; font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle {
  background: none; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 8px; cursor: pointer; color: var(--text-secondary); display: flex;
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--surface-hover); color: var(--text); }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
.sun-icon { display: none; }
.moon-icon { display: block; }

.mobile-menu-btn {
  display: none; flex-direction: column; gap: 4px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.mobile-menu-btn span {
  display: block; width: 20px; height: 2px;
  background: var(--text); border-radius: 2px; transition: var(--transition);
}

/* ===== MOBILE MENU ===== */
.mobile-menu {
  max-height: 0; overflow: hidden; background: var(--surface);
  border-top: 1px solid transparent; transition: max-height 0.35s ease, border-color 0.3s ease;
}
.mobile-menu.open {
  max-height: 500px; border-top-color: var(--border);
}
.mobile-menu-inner {
  padding: 8px 24px 16px; display: flex; flex-direction: column; gap: 2px;
}
.mobile-menu-link {
  display: block; padding: 12px 16px; border-radius: var(--radius-sm);
  color: var(--text); font-size: 0.9rem; font-weight: 500; text-decoration: none;
  transition: background var(--transition), color var(--transition);
}
.mobile-menu-link:hover { background: var(--primary-light); color: var(--primary); }

/* ===== HERO ===== */
.hero {
  max-width: 1200px; margin: 0 auto; padding: 80px 24px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  min-height: calc(100vh - 64px);
}
.hero-badge {
  display: inline-block; padding: 6px 14px;
  background: var(--success-light); color: var(--success);
  border-radius: 20px; font-size: 0.85rem; font-weight: 600; margin-bottom: 20px;
}
.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800;
  line-height: 1.15; margin-bottom: 20px;
}
.gradient-text { background: var(--gradient-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-content p {
  font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 520px;
}
.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 48px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.95rem; cursor: pointer;
  transition: all var(--transition); border: none;
}
.btn-primary {
  background: var(--gradient-1); color: #fff;
  box-shadow: 0 4px 14px rgba(99,102,241,0.4);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99,102,241,0.5); }
.btn-outline {
  background: transparent; border: 2px solid var(--border); color: var(--text);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.hero-stats { display: flex; gap: 32px; }
.stat { text-align: center; }
.stat-number { display: block; font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 0.85rem; color: var(--text-muted); }

.hero-visual { position: relative; height: 400px; }
.floating-card {
  position: absolute; padding: 16px 24px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); font-weight: 600;
  box-shadow: var(--shadow-lg); animation: float 4s ease-in-out infinite;
  cursor: pointer; transition: all var(--transition);
}
.floating-card:hover { border-color: var(--primary); color: var(--primary); box-shadow: 0 12px 24px rgba(99,102,241,0.25); }
.card-1 { top: 10%; left: 10%; animation-delay: 0s; }
.card-2 { top: 30%; right: 10%; animation-delay: 1s; }
.card-3 { bottom: 20%; left: 15%; animation-delay: 2s; }
.card-4 { bottom: 5%; right: 15%; animation-delay: 0.5s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ===== SEARCH ===== */
.search-section { padding: 40px 0 20px; }
.search-bar {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 2px solid var(--border);
  border-radius: var(--radius); padding: 14px 20px;
  transition: border-color var(--transition);
  max-width: 600px; margin: 0 auto;
}
.search-bar:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-light); }
.search-bar svg { color: var(--text-muted); flex-shrink: 0; }
.search-bar input {
  width: 100%; border: none; background: none;
  font-size: 1rem; color: var(--text); outline: none;
  font-family: inherit;
}
.search-bar input::placeholder { color: var(--text-muted); }

.filter-tags {
  display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
  margin-top: 20px;
}
.filter-tag {
  padding: 8px 16px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-secondary);
  font-size: 0.85rem; font-weight: 500; cursor: pointer;
  transition: all var(--transition); font-family: inherit;
}
.filter-tag:hover { border-color: var(--primary); color: var(--primary); }
.filter-tag.active {
  background: var(--primary); border-color: var(--primary); color: #fff;
}

/* ===== PROGRAM TABS ===== */
.programs-section { padding: 40px 0 20px; }
.section-title { font-size: 1.75rem; font-weight: 700; text-align: center; margin-bottom: 8px; }
.section-subtitle { text-align: center; color: var(--text-secondary); margin-bottom: 24px; }

.program-tabs {
  display: flex; gap: 8px; justify-content: center; flex-wrap: wrap;
}
.program-tab {
  padding: 10px 20px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-secondary); font-weight: 500; cursor: pointer;
  transition: all var(--transition); font-family: inherit; font-size: 0.9rem;
}
.program-tab:hover { border-color: var(--primary); color: var(--primary); }
.program-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ===== RESOURCES GRID ===== */
.resources-section { padding: 32px 0 80px; }
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}

.resource-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: all var(--transition); display: flex; flex-direction: column;
}
.resource-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md); border-color: var(--primary);
}

.resource-header { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; }
.resource-icon {
  width: 44px; height: 44px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; flex-shrink: 0;
}
.icon-yt { background: #fef2f2; color: #ef4444; }
.icon-web { background: #eef2ff; color: #6366f1; }
.icon-ebook { background: #ecfdf5; color: #10b981; }
.icon-practice { background: #fffbeb; color: #f59e0b; }
.icon-tool { background: #f3e8ff; color: #9333ea; }
.icon-course { background: #ecfeff; color: #06b6d4; }
.icon-github { background: #f0fdf4; color: #16a34a; }
[data-theme="dark"] .icon-github { background: #0f2a1a; color: #4ade80; }

.resource-info { flex: 1; }
.resource-info h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 4px; }
.resource-info .resource-type {
  font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em;
  font-weight: 500;
}
.resource-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 16px; line-height: 1.5; flex: 1; }

.resource-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.resource-tag {
  padding: 3px 10px; border-radius: 12px;
  font-size: 0.75rem; font-weight: 500;
  background: var(--primary-light); color: var(--primary);
}

.resource-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-sm);
  background: var(--primary); color: #fff; font-weight: 500;
  font-size: 0.85rem; transition: all var(--transition);
  align-self: flex-start;
}
.resource-link:hover { background: var(--primary-hover); transform: translateX(2px); }

.no-results {
  text-align: center; padding: 60px 20px; color: var(--text-muted);
}
.no-results svg { margin-bottom: 16px; opacity: 0.5; }
.no-results h3 { color: var(--text-secondary); margin-bottom: 8px; }

/* ===== USEFUL APPS ACCORDION ===== */
.apps-section { padding: 60px 0; }
.apps-accordion { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.app-category {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all var(--transition);
}
.app-category.open { border-color: var(--primary); box-shadow: var(--shadow-md); }

.category-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; cursor: pointer; user-select: none;
  transition: background var(--transition);
}
.category-header:hover { background: var(--surface-hover); }
.category-header h3 {
  font-size: 1rem; font-weight: 600; display: flex; align-items: center; gap: 10px;
}
.cat-icon {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}
.cat-icon.ai { background: #f3e8ff; color: #9333ea; }
.cat-icon.code { background: #eef2ff; color: #6366f1; }
.cat-icon.learn { background: #ecfdf5; color: #10b981; }
.cat-icon.prod { background: #fffbeb; color: #f59e0b; }
[data-theme="dark"] .cat-icon.ai { background: #2a1538; color: #c084fc; }
[data-theme="dark"] .cat-icon.code { background: #1e1b4b; color: #818cf8; }
[data-theme="dark"] .cat-icon.learn { background: #0f3a2c; color: #34d399; }
[data-theme="dark"] .cat-icon.prod { background: #3b2f0a; color: #fbbf24; }

.category-arrow {
  width: 20px; height: 20px; color: var(--text-muted);
  transition: transform 0.3s ease;
}
.app-category.open .category-arrow { transform: rotate(180deg); }

.category-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.app-category.open .category-body {
  padding: 0 24px 20px;
}

.apps-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px;
}
.app-card {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg);
  word-break: break-word;
  transition: all var(--transition); text-decoration: none; color: var(--text);
}
.app-card:hover {
  border-color: var(--primary); transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.app-card-emoji {
  font-size: 1.3rem; flex-shrink: 0; width: 32px; text-align: center; line-height: 1.3;
}
.app-card-info { min-width: 0; flex: 1; }
.app-card-info .app-name {
  font-size: 0.85rem; font-weight: 600; margin-bottom: 2px;
  line-height: 1.3;
}
.app-card-info .app-desc {
  font-size: 0.72rem; color: var(--text-muted);
  line-height: 1.4;
}
.app-card-badge {
  margin-left: auto; flex-shrink: 0; margin-top: 2px;
  font-size: 0.6rem; padding: 2px 7px; border-radius: 10px; white-space: nowrap;
  background: var(--success-light); color: var(--success); font-weight: 500;
}

/* ===== QUICK LINKS ===== */
.quick-links { padding: 80px 0; background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.quick-links-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; margin-top: 32px; }
.quick-link-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: all var(--transition);
}
.quick-link-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.ql-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--gradient-1); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.1rem; margin-bottom: 16px;
}
.quick-link-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.quick-link-card p { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 12px; }
.ql-link { font-weight: 500; font-size: 0.85rem; color: var(--primary); }

/* ===== FOOTER ===== */
.footer { padding: 60px 0 24px; background: var(--surface); border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand h3 {
  font-size: 1.2rem; font-weight: 700; margin-bottom: 8px;
  background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; }
.footer-links h4 { font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 12px; color: var(--text); }
.footer-links a, .footer-links p { display: block; color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 8px; }
.footer-links a:hover { color: var(--primary); }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid var(--border); }
.footer-bottom p { color: var(--text-muted); font-size: 0.8rem; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; text-align: center; padding: 40px 24px; min-height: auto; gap: 32px; }
  .hero-content p { margin: 0 auto 32px; }
  .hero-buttons { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .resources-grid { grid-template-columns: 1fr; }
  .apps-grid { grid-template-columns: 1fr 1fr; }
  .category-header { padding: 14px 16px; }
  .category-header h3 { font-size: 0.9rem; }
  .app-category.open .category-body { padding: 0 12px 14px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .mobile-menu-btn { display: flex; }
  .filter-tags { gap: 6px; }
  .filter-tag { padding: 6px 12px; font-size: 0.8rem; }
}

@media (max-width: 480px) {
  .hero-stats { gap: 20px; }
  .stat-number { font-size: 1.2rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .apps-grid { grid-template-columns: 1fr; }
}