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

:root {
  --bg:        #000000;
  --bg2:       #080808;
  --bg3:       #0f0f0f;
  --border:    #1a1a1a;
  --gold:      #cc2222;
  --gold-dim:  #8a1515;
  --text:      #e8eaf0;
  --text-dim:  #7a8099;
  --text-muted:#4a5268;
  --green:     #4caf82;
  --red:       #e05c5c;
  --radius:    10px;
  --nav-h:     64px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

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

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: rgba(7, 9, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  filter: brightness(1) invert(0);
}

.logo-piq {
  background: linear-gradient(135deg, #cc2222, #ff4444);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link.active {
  color: var(--gold);
}

/* ── HERO ── */
.hero {
  position: relative;
  overflow: hidden;
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: 80px 40px;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.hero-glow {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(ellipse 60% 50% at 50% 30%, rgba(204,34,34,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 80% 80% at 50% 100%, rgba(204,34,34,0.04) 0%, transparent 60%);
}

.hero-logo {
  width: 90px;
  height: 90px;
  object-fit: contain;
  margin-bottom: 24px;
  filter: drop-shadow(0 0 20px rgba(204,34,34,0.25));
}

.hero-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
}

.hero-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #ffffff 40%, #9098b0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #cc2222, #ff3333);
  color: #ffffff;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(204,34,34,0.35); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--text-dim); background: var(--bg2); }

/* ── SECTIONS ── */
.section { padding: 80px 0; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 40px; }

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
}

.section-header h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 700;
}

.link-arrow {
  font-size: 0.85rem;
  color: var(--gold);
  font-weight: 500;
  transition: gap 0.2s;
}
.link-arrow:hover { text-decoration: underline; }

/* ── STATS BAR ── */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 24px 40px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 0 48px;
  text-align: center;
}

.stat-value {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

.stat-label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* ── PILLARS ── */
.pillars-section { padding-top: 80px; }

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.pillar-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: border-color 0.2s, transform 0.2s;
  cursor: pointer;
}
.pillar-card:hover {
  border-color: var(--gold);
  transform: translateY(-3px);
}

.pillar-icon {
  font-size: 1.2rem;
  color: var(--gold);
}

.pillar-card h3 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 700;
}

.pillar-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.65;
  flex: 1;
}

.pillar-cta {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gold);
  margin-top: 4px;
}

/* ── JOIN CTA ── */
.cta-section {
  padding: 100px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
}

.cta-inner {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 0 40px;
}

.cta-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin-bottom: 8px;
  filter: drop-shadow(0 0 16px rgba(204,34,34,0.2));
}

.cta-inner h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2rem;
  font-weight: 700;
}

.cta-inner p {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 8px;
}


/* ── TOP STUDENTS (homepage) ── */
.top-students-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.top-students-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.top-student-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 24px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s;
}
.top-student-card:hover { border-color: var(--gold-dim); transform: translateY(-2px); }

.top-student-card.rank-1 { border-top: 3px solid #cc2222; }
.top-student-card.rank-2 { border-top: 3px solid #888; }
.top-student-card.rank-3 { border-top: 3px solid #cd7f32; }

.rank-badge {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 800;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.student-name {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.student-credits {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-dim);
}
.student-credits small { font-size: 0.75rem; font-weight: 400; color: var(--text-muted); }

.skeleton-row {
  height: 60px;
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--bg2) 25%, var(--bg3) 50%, var(--bg2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ── PAGE HEADER ── */
.page-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
}
.page-header h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.page-header p { color: var(--text-dim); font-size: 0.95rem; }

/* ── CREDITS PAGE ── */
.controls {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}
.search-input:focus { border-color: var(--gold-dim); }
.search-input::placeholder { color: var(--text-muted); }

.filter-select {
  padding: 10px 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
}
.filter-select:focus { border-color: var(--gold-dim); }

.credits-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.credits-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.credits-table thead {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}

.credits-table th {
  padding: 14px 20px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.credits-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.credits-table tbody tr:last-child td { border-bottom: none; }
.credits-table tbody tr:hover { background: var(--bg3); }

.col-rank { width: 70px; font-size: 1.1rem; }
.col-name { font-family: 'DM Sans', system-ui, sans-serif; font-size: 1.1rem; font-weight: 700; }
.col-class { width: 110px; }
.col-credits { width: 130px; text-align: right; font-size: 1.05rem; font-weight: 700; }
th.col-credits { text-align: right; }

.class-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.class-gold   { background: rgba(255,255,255,0.07); color: #ffffff; border: 1px solid rgba(255,255,255,0.18); }
.class-silver { background: rgba(144,200,255,0.1); color: #90c8ff; border: 1px solid rgba(144,200,255,0.25); }
.class-bronze { background: rgba(74,144,217,0.12); color: #4a90d9; border: 1px solid rgba(74,144,217,0.3); }
.class-low    { background: rgba(255,85,85,0.1); color: #ff5555; border: 1px solid rgba(255,85,85,0.3); }
.class-na     { background: rgba(100,110,130,0.1); color: var(--text-muted); border: 1px solid var(--border); }

.credit-positive { color: var(--green); font-weight: 600; }
.credit-negative { color: var(--red);   font-weight: 600; }
.credit-zero     { color: var(--text-muted); font-weight: 600; }

.loading-row td { padding: 40px; text-align: center; color: var(--text-muted); }

.no-results {
  padding: 48px;
  text-align: center;
  color: var(--text-muted);
}
.hidden { display: none; }

.last-updated {
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: right;
}

/* ── LIBRARY PAGE ── */
.library-controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 40px;
}

.tag-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag-btn {
  padding: 6px 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.tag-btn:hover { border-color: var(--text-dim); color: var(--text); }
.tag-btn.active { background: var(--gold); border-color: var(--gold); color: #07090d; font-weight: 600; }

.library-empty {
  text-align: center;
  padding: 100px 40px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

.empty-icon {
  font-size: 2.5rem;
  color: var(--border);
  margin-bottom: 20px;
}

.library-empty h3 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-dim);
}

.library-empty p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ── YOUTUBE FEED ── */
.yt-section { background: var(--bg2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.yt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.yt-card {
  display: flex;
  flex-direction: column;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.yt-card:hover { border-color: var(--gold-dim); transform: translateY(-3px); }

.yt-thumb-wrap {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #000;
}
.yt-thumb { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.3s; }
.yt-card:hover .yt-thumb { transform: scale(1.04); }

.yt-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity 0.2s;
  color: #fff;
  font-size: 2rem;
}
.yt-card:hover .yt-play { opacity: 1; }

.yt-info { padding: 12px 14px; }
.yt-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.skeleton-card {
  border-radius: var(--radius);
  aspect-ratio: 16/9;
  background: linear-gradient(90deg, var(--bg2) 25%, var(--bg3) 50%, var(--bg2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}

/* ── BOOK CTA ── */
.book-cta-section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.book-cta-inner {
  display: flex;
  align-items: center;
  gap: 60px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
}

.book-cover {
  width: 180px;
  flex-shrink: 0;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 30px rgba(204,34,34,0.1);
}

.book-cta-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.book-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
}

.book-cta-text h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
}

.book-cta-text p {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 480px;
}

/* ── FOOTER ── */
.footer {
  padding: 24px 40px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ── CLASS BADGES ON HOMEPAGE ── */
.student-class {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}
.class-A, .class-Aplus, .class-Aminus {
  background: rgba(255,255,255,0.07); color: #ffffff; border: 1px solid rgba(255,255,255,0.18);
}
.class-Bplus, .class-B, .class-Bminus {
  background: rgba(144,200,255,0.1); color: #90c8ff; border: 1px solid rgba(144,200,255,0.25);
}
.class-Cplus, .class-C, .class-Cminus {
  background: rgba(74,144,217,0.12); color: #4a90d9; border: 1px solid rgba(74,144,217,0.3);
}
.class-Dplus, .class-D {
  background: rgba(255,85,85,0.1); color: #ff5555; border: 1px solid rgba(255,85,85,0.3);
}
.class-NA {
  background: rgba(100,110,130,0.1); color: #4a5268; border: 1px solid #1e2330;
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .nav { padding: 0 20px; }
  .nav-links { gap: 20px; }
  .hero { padding: 60px 20px; }
  .container { padding: 0 20px; }
  .controls { flex-direction: column; }
  .section { padding: 60px 0; }
  .book-cta-inner { flex-direction: column; padding: 32px 24px; text-align: center; align-items: center; }
}