/* ── Shared styles for year hubs (yeark.html ... year12.html) ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: hsl(201, 100%, 13%);
  --bg-dark: #000a14;
  --text-primary: #ffffff;
  --text-muted: hsl(240, 4%, 66%);
  --glass-border: rgba(255,255,255,0.08);
  --glass-bg: rgba(255,255,255,0.03);
  --glass-bg-hover: rgba(255,255,255,0.07);
  --accent: #9bbdd4;
  --maths: #2980b9;
  --english: #5e35b1;
  --radius-card: 24px;
  --radius-pill: 50px;
  --transition-smooth: 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: ''; position: fixed; top: -30%; left: -10%; width: 60%; height: 60%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.025) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}
body::after {
  content: ''; position: fixed; bottom: -20%; right: -10%; width: 50%; height: 50%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.02) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}

/* Nav */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 24px 48px;
  transition: background var(--transition-smooth), padding var(--transition-smooth);
}
nav.scrolled {
  background: hsla(201, 100%, 13%, 0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  padding: 16px 48px;
  border-bottom: 1px solid var(--glass-border);
}
.nav-logo {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 32px; font-weight: 400; letter-spacing: -0.5px;
  color: var(--text-primary); text-decoration: none;
}
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; align-items: center; list-style: none; }
.nav-links a {
  color: rgba(255,255,255,0.5); text-decoration: none;
  font-size: 14px; font-weight: 400; transition: color 0.3s;
}
.nav-links a:hover { color: #fff; }
.nav-cta {
  padding: 10px 28px !important;
  border: 1px solid rgba(255,255,255,0.15) !important;
  border-radius: var(--radius-pill) !important;
  color: #fff !important; font-weight: 500 !important;
  background: rgba(255,255,255,0.04);
  transition: all 0.3s !important;
}
.nav-cta:hover { background: rgba(255,255,255,0.1) !important; transform: scale(1.03); }

/* Breadcrumb */
.breadcrumb {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
  padding: 110px 48px 0;
  font-size: 13px; color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; transition: color 0.3s; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { margin: 0 10px; opacity: 0.5; }

/* Hero */
.hub-hero {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
  padding: 32px 48px 48px;
  text-align: center;
}
.hub-hero-emoji {
  font-size: 72px; display: block; margin-bottom: 16px;
  filter: saturate(0.9);
  opacity: 0; animation: fadeUp 0.6s ease-out 0.1s forwards;
}
.hub-hero h1 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(48px, 8vw, 88px); font-weight: 400;
  letter-spacing: -2px; line-height: 1; margin-bottom: 18px;
  opacity: 0; animation: fadeUp 0.6s ease-out 0.2s forwards;
}
.hub-hero h1 em { font-style: italic; opacity: 0.85; }
.hub-hero-tagline {
  font-size: 17px; color: var(--text-muted); line-height: 1.6;
  max-width: 580px; margin: 0 auto 32px;
  opacity: 0; animation: fadeUp 0.6s ease-out 0.3s forwards;
}
.hub-stats {
  display: flex; gap: 36px; justify-content: center; flex-wrap: wrap;
  opacity: 0; animation: fadeUp 0.6s ease-out 0.4s forwards;
}
.hub-stat { text-align: center; }
.hub-stat-num {
  font-size: 28px; font-weight: 700; letter-spacing: -0.5px; display: block;
  color: #fff;
}
.hub-stat-label {
  font-size: 11px; letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--text-muted); margin-top: 4px;
}

/* Section base */
.hub-section {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
  padding: 24px 48px;
}
.hub-section-title {
  font-size: 11px; letter-spacing: 4px; text-transform: uppercase;
  color: var(--text-muted); font-weight: 600; margin-bottom: 18px;
}

/* Continue practising card */
.continue-card {
  position: relative;
  display: flex; align-items: center; gap: 24px;
  padding: 28px 32px;
  background: linear-gradient(135deg, rgba(155,189,212,0.08) 0%, rgba(255,255,255,0.02) 100%);
  border: 1px solid rgba(155, 189, 212, 0.18);
  border-radius: var(--radius-card);
  text-decoration: none; color: inherit;
  transition: transform var(--transition-smooth), background var(--transition-smooth), border-color var(--transition-smooth);
}
.continue-card:hover {
  transform: translateY(-3px);
  border-color: rgba(155, 189, 212, 0.35);
  background: linear-gradient(135deg, rgba(155,189,212,0.12) 0%, rgba(255,255,255,0.04) 100%);
}
.continue-icon {
  width: 56px; height: 56px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(155, 189, 212, 0.15);
  border: 1px solid rgba(155, 189, 212, 0.25);
  border-radius: 16px; font-size: 28px;
}
.continue-content { flex: 1; min-width: 0; }
.continue-label {
  font-size: 11px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 4px;
}
.continue-title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 22px; font-weight: 400; margin-bottom: 4px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.continue-meta { font-size: 13px; color: var(--text-muted); }
.continue-arrow {
  font-size: 24px; color: var(--accent);
  transition: transform 0.3s;
}
.continue-card:hover .continue-arrow { transform: translateX(6px); }

/* Subject cards (large) */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 24px;
  margin-top: 16px;
}
.subject-card {
  position: relative; padding: 40px 36px 36px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  text-decoration: none; color: inherit;
  display: flex; flex-direction: column; gap: 18px;
  transition: transform var(--transition-smooth), background var(--transition-smooth), border-color var(--transition-smooth);
  overflow: hidden;
}
.subject-card.maths::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--maths), #3498db);
}
.subject-card.english::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--english), #7e57c2);
}
.subject-card:hover {
  transform: translateY(-6px);
  background: var(--glass-bg-hover);
  border-color: rgba(255,255,255,0.16);
}
.subject-head { display: flex; align-items: center; gap: 16px; }
.subject-icon {
  width: 56px; height: 56px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px; font-size: 28px;
}
.subject-name {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 28px; font-weight: 400; letter-spacing: -0.5px;
}
.subject-desc { font-size: 14px; color: var(--text-muted); line-height: 1.6; }
.subject-meta { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
.meta-pill {
  font-size: 11px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase;
  padding: 5px 12px; border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-muted);
}
.progress-track {
  flex: 1; min-width: 100px; height: 6px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px; overflow: hidden;
}
.progress-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), #c1d9e8);
  border-radius: 3px; transition: width 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}
.subject-card.maths .progress-fill { background: linear-gradient(90deg, var(--maths), #3498db); }
.subject-card.english .progress-fill { background: linear-gradient(90deg, var(--english), #7e57c2); }
.progress-pct { font-size: 13px; font-weight: 600; color: #fff; min-width: 40px; text-align: right; }
.subject-cta {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 500; color: var(--accent);
  margin-top: 8px;
}
.subject-cta::after {
  content: '→'; transition: transform 0.3s;
}
.subject-card:hover .subject-cta::after { transform: translateX(4px); }

/* Quick links footer cards */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 16px;
}
.link-card {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  text-decoration: none; color: inherit;
  transition: all 0.3s;
}
.link-card:hover {
  background: var(--glass-bg-hover);
  border-color: rgba(255,255,255,0.14);
  transform: translateY(-2px);
}
.link-icon { font-size: 22px; }
.link-text { font-size: 14px; font-weight: 500; }
.link-sub { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* Footer */
footer {
  position: relative; z-index: 1; text-align: center;
  padding: 56px 24px 64px;
  margin-top: 64px;
  border-top: 1px solid var(--glass-border);
}
footer p { font-size: 13px; color: var(--text-muted); line-height: 1.8; }
footer a { color: rgba(255,255,255,0.6); text-decoration: none; transition: color 0.3s; }
footer a:hover { color: #fff; }

/* Senior subject group cards (year11 / year12) */
.group-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  margin-bottom: 16px;
  transition: border-color 0.3s;
}
.group-card.open { border-color: rgba(155, 189, 212, 0.25); }
.group-head {
  display: flex; align-items: center; gap: 18px;
  padding: 24px 28px;
  cursor: pointer;
  transition: background 0.3s;
}
.group-head:hover { background: rgba(255,255,255,0.02); }
.group-icon {
  width: 52px; height: 52px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px; font-size: 26px;
}
.group-info { flex: 1; }
.group-title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 22px; font-weight: 400; letter-spacing: -0.3px;
}
.group-sub { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.group-toggle {
  font-size: 20px; color: var(--text-muted);
  transition: transform 0.3s;
}
.group-card.open .group-toggle { transform: rotate(180deg); color: var(--accent); }
.group-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.23, 1, 0.32, 1);
}
.group-card.open .group-body { max-height: 800px; }
.subject-list {
  padding: 0 20px 24px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
}
.subject-link {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  text-decoration: none; color: inherit;
  transition: all 0.3s;
}
.subject-link:hover {
  background: rgba(155, 189, 212, 0.08);
  border-color: rgba(155, 189, 212, 0.2);
  transform: translateX(4px);
}
.subject-link-icon { font-size: 20px; }
.subject-link-name { font-size: 14px; font-weight: 500; }
.subject-link-sub { font-size: 11px; color: var(--text-muted); margin-top: 2px; letter-spacing: 1px; text-transform: uppercase; }

/* Coming-soon page (Y7-Y10) */
.soon-hero {
  text-align: center;
  padding: 48px 24px;
}
.soon-tag {
  display: inline-block;
  font-size: 11px; letter-spacing: 3px; text-transform: uppercase;
  padding: 6px 14px; border-radius: var(--radius-pill);
  background: rgba(155, 189, 212, 0.15); color: var(--accent);
  border: 1px solid rgba(155, 189, 212, 0.25);
  margin-bottom: 24px; font-weight: 600;
}
.planned-list {
  max-width: 720px; margin: 32px auto;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  text-align: left;
}
.planned-item {
  padding: 16px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
}
.planned-item-title { font-weight: 500; font-size: 14px; margin-bottom: 4px; }
.planned-item-sub { font-size: 12px; color: var(--text-muted); line-height: 1.5; }
.email-form {
  max-width: 480px; margin: 32px auto 0;
  display: flex; gap: 10px;
}
.email-form input {
  flex: 1; padding: 14px 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-pill);
  color: #fff; font-size: 14px;
  font-family: inherit;
}
.email-form input::placeholder { color: var(--text-muted); }
.email-form input:focus {
  outline: none; border-color: var(--accent);
  background: rgba(255,255,255,0.06);
}
.email-form button {
  padding: 14px 28px;
  background: var(--accent); border: none;
  border-radius: var(--radius-pill);
  color: var(--bg-primary); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.3s;
  font-family: inherit;
}
.email-form button:hover { background: #b8d4e6; transform: scale(1.04); }
.email-success {
  margin-top: 20px; font-size: 14px; color: var(--accent);
  opacity: 0; transition: opacity 0.4s;
}
.email-success.show { opacity: 1; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  nav { padding: 16px 20px; }
  nav.scrolled { padding: 12px 20px; }
  .nav-links { display: none; }
  .breadcrumb { padding: 90px 20px 0; }
  .hub-hero { padding: 24px 20px 32px; }
  .hub-hero-emoji { font-size: 56px; }
  .hub-hero h1 { font-size: 44px; }
  .hub-hero-tagline { font-size: 15px; }
  .hub-stats { gap: 20px; }
  .hub-stat-num { font-size: 22px; }
  .hub-section { padding: 16px 20px; }
  .continue-card { padding: 22px 20px; gap: 16px; }
  .continue-icon { width: 44px; height: 44px; font-size: 22px; }
  .continue-title { font-size: 18px; }
  .subjects-grid { grid-template-columns: 1fr; }
  .subject-card { padding: 32px 24px 28px; }
  .subject-name { font-size: 24px; }
  .group-head { padding: 20px 22px; gap: 14px; }
  .group-title { font-size: 19px; }
  .subject-list { grid-template-columns: 1fr; padding: 0 16px 20px; }
  .email-form { flex-direction: column; }
}