/* ==========================================================================
   LOOPSELL ACADEMY — Design System
   Dark Mode | Netflix-style | SEO-optimized pages
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --bg-primary: #020617;
  --bg-secondary: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-purple: #a855f7;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --gradient-primary: linear-gradient(135deg, #a855f7, #3b82f6);
  --gradient-hero: linear-gradient(180deg, rgba(168,85,247,0.15) 0%, transparent 60%);
  --border-subtle: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px -10px rgba(168,85,247,0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1280px;
}

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

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

a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }

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

/* ---------- Navbar ---------- */
.academy-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  height: 72px;
  display: flex;
  align-items: center;
}

.academy-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-brand-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.nav-brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.nav-brand-text span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--accent-purple); }

.nav-cta {
  padding: 10px 24px;
  border-radius: 100px;
  background: var(--gradient-primary);
  color: white;
  font-size: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  display: inline-block;
}

.nav-cta:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

/* ---------- Hero / Page Header ---------- */
.hero-academy {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-academy::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(168,85,247,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 100px;
  background: rgba(168,85,247,0.1);
  border: 1px solid rgba(168,85,247,0.2);
  color: var(--accent-purple);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-title .gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* ---------- Segment Chooser (Home) ---------- */
.segments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  padding: 40px 0 80px;
}

.segment-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.segment-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.segment-card-visual {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  position: relative;
  overflow: hidden;
}

.segment-card-visual::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-card));
}

.segment-card-body {
  padding: 20px 24px 24px;
}

.segment-card-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
}

.segment-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.segment-card-count {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-purple);
}

/* ---------- Category Section ---------- */
.category-section {
  padding: 48px 0;
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.category-title {
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 12px;
}

.category-count {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ---------- Video Cards Grid ---------- */
.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.video-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.video-card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--bg-secondary);
  overflow: hidden;
}

.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.video-card:hover .video-card-thumb img {
  transform: scale(1.05);
}

.video-card-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.video-card:hover .video-card-play { opacity: 1; }

.video-card-play::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent white;
  margin-left: 3px;
}

.video-card-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(0,0,0,0.8);
  font-size: 12px;
  font-weight: 600;
  color: white;
}

.video-card-body {
  padding: 16px;
}

.video-card-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-meta {
  font-size: 13px;
  color: var(--text-muted);
}

.video-card-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(168,85,247,0.1);
  color: var(--accent-purple);
  font-size: 11px;
  font-weight: 600;
  margin-top: 10px;
}

/* ---------- Video Player Page ---------- */
.video-page {
  padding: 96px 0 60px;
}

.video-player-wrapper {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 0 auto 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.video-player-wrapper video {
  width: 100%;
  display: block;
}

.article-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-content h1 {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.article-content .article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  font-size: 14px;
  color: var(--text-muted);
}

.article-content .article-body {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-content .article-body h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  margin: 40px 0 16px;
}

.article-content .article-body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 32px 0 12px;
}

.article-content .article-body p {
  margin-bottom: 16px;
}

.article-content .article-body ul,
.article-content .article-body ol {
  margin: 16px 0;
  padding-left: 24px;
}

.article-content .article-body li {
  margin-bottom: 8px;
}

.article-content .article-body strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* ---------- Related Videos ---------- */
.related-section {
  padding: 60px 0 80px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 60px;
}

.related-title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 24px;
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  margin: 60px auto;
  max-width: 860px;
  padding: 48px;
  border-radius: var(--radius-xl);
  background: var(--gradient-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
}

.cta-banner h3 {
  font-size: 28px;
  font-weight: 900;
  margin-bottom: 12px;
  position: relative;
}

.cta-banner p {
  font-size: 16px;
  opacity: 0.9;
  margin-bottom: 28px;
  position: relative;
}

.cta-banner .btn-white {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 100px;
  background: white;
  color: #0f172a;
  font-size: 16px;
  font-weight: 800;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.cta-banner .btn-white:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(255,255,255,0.3);
}

/* ---------- Footer ---------- */
.academy-footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid var(--border-subtle);
  font-size: 14px;
  color: var(--text-muted);
}

/* ---------- Progress Bar (trilha) ---------- */
.progress-bar-container {
  background: var(--bg-secondary);
  border-radius: 100px;
  height: 6px;
  overflow: hidden;
  margin-top: 16px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 100px;
  transition: width 0.6s ease;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  padding: 96px 0 0;
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--transition);
}

.breadcrumb a:hover { color: var(--accent-purple); }
.breadcrumb .sep { opacity: 0.4; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .academy-nav { height: 60px; }
  .nav-links { display: none; }
  .hero-academy { padding: 120px 0 60px; }
  .hero-title { font-size: 32px; }
  .hero-subtitle { font-size: 16px; }
  .segments-grid { grid-template-columns: 1fr; gap: 16px; }
  .videos-grid { grid-template-columns: 1fr; gap: 16px; }
  .category-title { font-size: 20px; }
  .cta-banner { padding: 32px 24px; margin: 40px 16px; }
  .cta-banner h3 { font-size: 22px; }
  .article-content h1 { font-size: 28px; }
  .article-content .article-body { font-size: 16px; }
  .breadcrumb { padding-top: 72px; }
  .video-page { padding-top: 72px; }
}

@media (max-width: 480px) {
  .videos-grid { grid-template-columns: 1fr; }
  .segment-card-visual { height: 140px; font-size: 48px; }
}