/* ===== CSS Variables ===== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #06b6d4;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --bg-dark: #0f172a;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-white: #f1f5f9;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.08), 0 4px 6px rgba(0,0,0,.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,.1), 0 10px 10px rgba(0,0,0,.04);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
  --max-width: 1280px;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; border: none; outline: none; }
input, select, textarea { font-family: inherit; outline: none; }

/* ===== Container ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Header / Navbar ===== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0;
}
.navbar {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.4rem; font-weight: 800; color: var(--primary);
}
.nav-logo .logo-icon { font-size: 1.8rem; }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a {
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 500; color: var(--text-light);
  transition: all var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: #f1f5f9; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.btn { 
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: .9rem; font-weight: 600; transition: all var(--transition);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { border: 2px solid var(--border); color: var(--text); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius); }
.btn-sm { padding: 6px 14px; font-size: .82rem; }
.btn-ghost { background: transparent; color: var(--text-light); }
.btn-ghost:hover { background: #f1f5f9; color: var(--text); }

/* Mobile hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.hamburger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ===== Hero Section ===== */
.hero {
  padding: 80px 0 60px; text-align: center;
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 50%, #f0fdf4 100%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--border); border-radius: 50px;
  padding: 6px 16px; font-size: .85rem; font-weight: 600; color: var(--primary);
  margin-bottom: 24px;
}
.hero-badge .badge-dot { width: 8px; height: 8px; background: #22c55e; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800;
  line-height: 1.15; color: var(--bg-dark); margin-bottom: 16px;
}
.hero h1 span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p {
  font-size: 1.15rem; color: var(--text-light); max-width: 640px;
  margin: 0 auto 32px; line-height: 1.7;
}
.hero-search {
  max-width: 560px; margin: 0 auto 20px;
  display: flex; background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow-lg); overflow: hidden;
}
.hero-search input {
  flex: 1; padding: 16px 20px; border: none; font-size: 1rem;
}
.hero-search button {
  padding: 16px 28px; background: var(--primary); color: #fff;
  font-size: 1rem; font-weight: 600; border: none; cursor: pointer;
  transition: background var(--transition);
}
.hero-search button:hover { background: var(--primary-dark); }
.hero-stats {
  display: flex; justify-content: center; gap: 40px; margin-top: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .stat-num { font-size: 1.8rem; font-weight: 800; color: var(--bg-dark); }
.hero-stat .stat-label { font-size: .85rem; color: var(--text-light); margin-top: 2px; }

/* ===== Section Common ===== */
.section { padding: 72px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 2rem; font-weight: 800; color: var(--bg-dark); margin-bottom: 8px; }
.section-header p { color: var(--text-light); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }
.section-header.left { text-align: left; }
.section-header.left p { margin: 0; }

/* ===== Category Cards ===== */
.categories-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px;
}
.category-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 16px; text-align: center; transition: all var(--transition);
  cursor: pointer;
}
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.category-card .cat-icon { font-size: 2rem; margin-bottom: 12px; }
.category-card h3 { font-size: .95rem; font-weight: 700; margin-bottom: 4px; }
.category-card .cat-count { font-size: .8rem; color: var(--text-light); }

/* ===== Tool Cards ===== */
.tools-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.tool-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: all var(--transition); position: relative; overflow: hidden;
}
.tool-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.tool-card .tool-badge {
  position: absolute; top: 16px; right: 16px;
  font-size: .72rem; font-weight: 700; padding: 4px 10px; border-radius: 50px;
}
.tool-badge.editor-pick { background: #fef3c7; color: #92400e; }
.tool-badge.trending { background: #dbeafe; color: #1e40af; }
.tool-badge.free { background: #d1fae5; color: #065f46; }
.tool-badge.freemium { background: #ede9fe; color: #5b21b6; }
.tool-badge.paid { background: #fce7f3; color: #9d174d; }
.tool-card .tool-logo {
  width: 48px; height: 48px; border-radius: var(--radius-sm);
  background: #f1f5f9; display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 14px;
}
.tool-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.tool-card p { font-size: .85rem; color: var(--text-light); line-height: 1.5; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tool-card .tool-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.tool-card .tool-tag {
  font-size: .73rem; padding: 3px 10px; border-radius: 50px;
  background: #f1f5f9; color: var(--text-light);
}
.tool-card .tool-footer { display: flex; align-items: center; justify-content: space-between; }
.tool-card .tool-rating { font-size: .82rem; color: var(--accent); font-weight: 600; }
.tool-card .tool-users { font-size: .78rem; color: var(--text-light); }

/* ===== List View ===== */
.tools-list { display: flex; flex-direction: column; gap: 12px; }
.tool-list-item {
  display: flex; align-items: center; gap: 20px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 24px; transition: all var(--transition);
}
.tool-list-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow-md); }
.tool-list-item .tool-logo {
  width: 52px; height: 52px; border-radius: var(--radius-sm); background: #f1f5f9;
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem; flex-shrink: 0;
}
.tool-list-item .tool-info { flex: 1; min-width: 0; }
.tool-list-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 2px; }
.tool-list-item .tool-desc { font-size: .84rem; color: var(--text-light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tool-list-item .tool-meta { display: flex; align-items: center; gap: 16px; flex-shrink: 0; }

/* ===== Filters Bar ===== */
.filters-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 20px 0; border-bottom: 1px solid var(--border); margin-bottom: 28px;
}
.filter-group { display: flex; align-items: center; gap: 8px; }
.filter-group label { font-size: .85rem; font-weight: 600; color: var(--text-light); }
.filter-select {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: .85rem; background: #fff; color: var(--text); cursor: pointer;
}
.filter-search {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-size: .85rem; width: 220px; background: #fff;
}
.view-toggle { display: flex; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; margin-left: auto; }
.view-toggle button {
  padding: 8px 14px; background: #fff; border: none; font-size: .85rem; cursor: pointer;
  transition: all var(--transition); color: var(--text-light);
}
.view-toggle button.active { background: var(--primary); color: #fff; }
.tool-count { font-size: .85rem; color: var(--text-light); }

/* ===== Tool Detail Page ===== */
.tool-detail-hero {
  background: linear-gradient(135deg, #eef2ff 0%, #f0fdf4 100%);
  padding: 48px 0;
}
.tool-detail-header {
  display: flex; align-items: flex-start; gap: 24px;
}
.tool-detail-logo {
  width: 80px; height: 80px; border-radius: var(--radius);
  background: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 2.4rem; box-shadow: var(--shadow-md); flex-shrink: 0;
}
.tool-detail-info { flex: 1; }
.tool-detail-info h1 { font-size: 2rem; font-weight: 800; margin-bottom: 6px; }
.tool-detail-info .detail-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.tool-detail-info .detail-desc { font-size: 1.05rem; color: var(--text-light); max-width: 640px; line-height: 1.7; }
.tool-detail-actions { display: flex; gap: 12px; align-items: flex-start; }
.tool-detail-body {
  padding: 48px 0; display: grid; grid-template-columns: 1fr 320px; gap: 40px;
}
.tool-detail-main h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 12px; }
.tool-detail-main p { color: var(--text-light); line-height: 1.8; margin-bottom: 16px; }
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.feature-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px; background: #f8fafc; border-radius: var(--radius-sm); font-size: .9rem;
}
.feature-item .feat-icon { color: #22c55e; font-size: 1.1rem; margin-top: 2px; }
.tool-detail-sidebar > div {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-bottom: 20px;
}
.tool-detail-sidebar h3 { font-size: 1rem; font-weight: 700; margin-bottom: 14px; }
.sidebar-info-item { display: flex; justify-content: space-between; padding: 8px 0; font-size: .88rem; }
.sidebar-info-label { color: var(--text-light); }
.sidebar-info-value { font-weight: 600; }

/* ===== Breadcrumbs ===== */
.breadcrumbs { padding: 16px 0; font-size: .85rem; color: var(--text-light); }
.breadcrumbs a { color: var(--primary); }
.breadcrumbs span { margin: 0 6px; }

/* ===== Page Header ===== */
.page-header {
  padding: 48px 0 32px; text-align: center;
  background: linear-gradient(135deg, #eef2ff 0%, #f0fdf4 100%);
}
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 8px; }
.page-header p { color: var(--text-light); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* ===== Education / Courses ===== */
.courses-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.course-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all var(--transition);
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.course-card-image {
  height: 180px; display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
}
.course-card-image.c1 { background: linear-gradient(135deg, #eef2ff, #e0e7ff); }
.course-card-image.c2 { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }
.course-card-image.c3 { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.course-card-image.c4 { background: linear-gradient(135deg, #fef3c7, #fde68a); }
.course-card-image.c5 { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.course-card-image.c6 { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.course-card-content { padding: 20px; }
.course-card-content .course-level {
  font-size: .75rem; font-weight: 700; text-transform: uppercase;
  padding: 3px 10px; border-radius: 50px; display: inline-block; margin-bottom: 10px;
}
.course-level.beginner { background: #d1fae5; color: #065f46; }
.course-level.intermediate { background: #fef3c7; color: #92400e; }
.course-level.advanced { background: #ede9fe; color: #5b21b6; }
.course-level.all-levels { background: #dbeafe; color: #1e40af; }
.course-card-content h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.course-card-content p { font-size: .85rem; color: var(--text-light); margin-bottom: 12px; line-height: 1.5; }
.course-meta { display: flex; gap: 16px; font-size: .8rem; color: var(--text-light); }
.course-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== Bootcamp Banner ===== */
.bootcamp-banner {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-lg); padding: 40px; text-align: center; color: #fff; margin: 40px 0;
}
.bootcamp-banner h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 8px; }
.bootcamp-banner p { opacity: .9; margin-bottom: 20px; font-size: 1.05rem; }
.bootcamp-banner .btn { background: #fff; color: var(--primary); font-weight: 700; }

/* ===== About Page ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-image {
  background: linear-gradient(135deg, #eef2ff, #e0f2fe); border-radius: var(--radius-lg);
  height: 400px; display: flex; align-items: center; justify-content: center; font-size: 5rem;
}
.about-content h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 16px; }
.about-content p { color: var(--text-light); line-height: 1.8; margin-bottom: 16px; }
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.stat-card {
  background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border);
  padding: 24px; text-align: center;
}
.stat-card .stat-num { font-size: 2rem; font-weight: 800; color: var(--primary); }
.stat-card .stat-label { color: var(--text-light); font-size: .9rem; margin-top: 4px; }

/* ===== Newsletter ===== */
.newsletter {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 48px; text-align: center; margin: 48px 0;
}
.newsletter h2 { font-size: 1.5rem; font-weight: 800; margin-bottom: 8px; }
.newsletter p { color: var(--text-light); margin-bottom: 24px; }
.newsletter-form { display: flex; gap: 12px; max-width: 500px; margin: 0 auto; }
.newsletter-form input {
  flex: 1; padding: 12px 18px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: .95rem;
}
.newsletter-form button { padding: 12px 28px; }

/* ===== Pagination ===== */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 40px; }
.pagination button, .pagination span {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: .9rem; font-weight: 600;
  background: #fff; cursor: pointer; transition: all var(--transition);
}
.pagination button:hover { border-color: var(--primary); color: var(--primary); }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark); color: var(--text-white); padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .footer-logo { font-size: 1.4rem; font-weight: 800; color: var(--primary-light); margin-bottom: 12px; }
.footer-brand p { color: #94a3b8; font-size: .9rem; line-height: 1.7; max-width: 300px; }
.footer-col h4 { font-size: .9rem; font-weight: 700; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 16px; color: #cbd5e1; }
.footer-col a { display: block; color: #94a3b8; font-size: .88rem; padding: 4px 0; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #1e293b; padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
  color: #64748b; font-size: .85rem;
}
.footer-social { display: flex; gap: 16px; }
.footer-social a { color: #94a3b8; font-size: 1.2rem; transition: color var(--transition); }
.footer-social a:hover { color: #fff; }

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .categories-grid { grid-template-columns: repeat(3, 1fr); }
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
  .courses-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { gap: 24px; }
  .tool-detail-body { grid-template-columns: 1fr; }
  .tool-detail-header { flex-direction: column; align-items: center; text-align: center; }
  .tool-detail-info .detail-desc { max-width: none; }
  .tool-detail-actions { justify-content: center; }
  .about-grid { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .filters-bar { flex-direction: column; align-items: stretch; }
  .filter-search { width: 100%; }
  .view-toggle { margin-left: 0; }
  .tool-list-item { flex-wrap: wrap; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr; }
  .newsletter-form { flex-direction: column; }
}
@media (max-width: 500px) {
  .categories-grid { grid-template-columns: 1fr 1fr; }
  .tools-grid { grid-template-columns: 1fr; }
  .courses-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.8rem; }
}