:root {
  --bg: #06070d;
  --bg-2: #0a0f1c;
  --panel: rgba(14, 18, 31, 0.84);
  --panel-2: rgba(20, 26, 44, 0.88);
  --glass: rgba(135, 92, 246, 0.08);
  --line: rgba(255,255,255,0.10);
  --line-strong: rgba(94,231,255,0.28);
  --text: #f7f8fc;
  --muted: #b9c3dc;
  --soft: #96a2c1;
  --gold: #f4c75b;
  --purple: #8b5cf6;
  --blue: #5ee7ff;
  --green: #59f1b3;
  --danger: #ff7b88;
  --shadow: 0 18px 56px rgba(0,0,0,.36);
  --shadow-2: 0 22px 90px rgba(0,0,0,.42);
  --radius: 24px;
  --radius-sm: 16px;
  --max: 1380px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  font: 400 16px/1.55 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(139,92,246,.18), transparent 24%),
    radial-gradient(circle at top right, rgba(94,231,255,.14), transparent 26%),
    radial-gradient(circle at bottom center, rgba(244,199,91,.12), transparent 25%),
    linear-gradient(180deg, rgba(7,9,15,.96), rgba(4,6,10,.99)),
    url('./media/bg-ledger.png') center/cover fixed;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
button, input, textarea, select { color: var(--text); }
input, textarea, select {
  width: 100%;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
  border-radius: 16px;
  padding: 13px 14px;
  outline: none;
}
input:focus, textarea:focus, select:focus { border-color: rgba(94,231,255,.42); box-shadow: 0 0 0 1px rgba(94,231,255,.22), 0 0 18px rgba(94,231,255,.12); }
textarea { min-height: 120px; resize: vertical; }

input[type="checkbox"], input[type="radio"] { width: auto; min-width: 18px; padding: 0; accent-color: var(--purple); }
details > summary { cursor: pointer; list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details > summary { display:flex; align-items:center; gap:10px; }

.site-shell {
  width: min(var(--max), calc(100vw - 24px));
  margin: 0 auto;
  padding: 18px 0 48px;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 80;
  padding-top: 8px;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-radius: 20px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(9,12,20,.82);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  text-decoration: none;
}
.brand img {
  width: 72px;
  filter: drop-shadow(0 0 18px rgba(139,92,246,.44)) drop-shadow(0 0 32px rgba(244,199,91,.18));
  animation: floatPulse 6.3s ease-in-out infinite;
}
.brand-kicker, .eyebrow, .kicker {
  text-transform: uppercase;
  letter-spacing: .18em;
  font-size: 12px;
}
.brand-kicker, .eyebrow { color: var(--gold); }
.brand-title {
  display: block;
  font-size: 18px;
  font-weight: 800;
}
.brand-sub { display: block; font-size: 12px; color: var(--muted); }
.main-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.main-nav a, .pill-link {
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: #fff4cf;
  transition: .22s ease;
}
.main-nav a:hover,
.main-nav a[aria-current="page"],
.pill-link:hover {
  transform: translateY(-1px);
  border-color: rgba(94,231,255,.35);
  box-shadow: 0 0 0 1px rgba(94,231,255,.18), 0 0 18px rgba(94,231,255,.16);
}
.page { display: grid; gap: 22px; padding-top: 20px; }
.hero, .panel, .card, .callout, .table-shell, .auth-shell, details.shell, .split-panel, .subpanel {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 22, 38, .90), rgba(10, 13, 23, .84));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero { overflow: hidden; }
.hero-grid, .split-grid, .grid-2, .grid-3, .grid-4, .quick-grid, .dashboard-grid, .content-grid, .stats-grid {
  display: grid;
  gap: 18px;
}
.hero-grid {
  grid-template-columns: 1.08fr .92fr;
  padding: 28px;
  align-items: center;
}
.hero h1, h2, h3 { margin: 10px 0; }
.hero h1 { font-size: clamp(34px, 4.8vw, 62px); line-height: 1.02; letter-spacing: -0.03em; }
.lead, p, .muted { color: var(--muted); }
.lead { font-size: 18px; }
.hero-actions, .inline-actions, .button-row, .row-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.button, .ghost-button, .neon-button, .danger-button, .soft-button {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  text-decoration: none;
  cursor: pointer;
  transition: .22s ease;
  color: white;
}
.button {
  background: linear-gradient(135deg, rgba(139,92,246,.34), rgba(12,16,28,.92));
  box-shadow: 0 0 0 1px rgba(139,92,246,.16), 0 16px 36px rgba(0,0,0,.25);
}
.ghost-button, .soft-button { background: rgba(255,255,255,.04); }
.neon-button {
  background: linear-gradient(135deg, rgba(7,36,54,.96), rgba(12,99,122,.92));
  border-color: rgba(94,231,255,.32);
  box-shadow: 0 0 0 1px rgba(94,231,255,.18), 0 0 18px rgba(94,231,255,.16), 0 18px 40px rgba(0,0,0,.28);
}
.danger-button {
  background: linear-gradient(135deg, rgba(102,21,38,.96), rgba(57,11,18,.96));
  border-color: rgba(255,123,136,.30);
}
.soft-button { color: #efe8ff; }
.button:hover, .ghost-button:hover, .neon-button:hover, .danger-button:hover, .soft-button:hover { transform: translateY(-1px); }
.status-bar, .chip-row, .meta-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.status-pill, .chip, .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.05);
  color: #f7edd5;
  font-size: 13px;
}
.badge.neon { color: #d7fbff; border-color: rgba(94,231,255,.24); box-shadow: 0 0 0 1px rgba(94,231,255,.14), 0 0 14px rgba(94,231,255,.10); }
.hero-visual, .visual-panel {
  position: relative;
  min-height: 540px;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.hero-visual::before, .visual-panel::before {
  content: "";
  position: absolute;
  inset: 10% 14%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139,92,246,.30), rgba(94,231,255,.07), transparent 70%);
  filter: blur(10px);
}
.constellation-logo {
  position: absolute;
  width: 112px;
  filter: drop-shadow(0 0 18px rgba(139,92,246,.42));
  animation: floatPulse 7s ease-in-out infinite;
}
.logo-1 { top: 8%; left: 8%; }
.logo-2 { top: 12%; right: 7%; animation-delay: -1.8s; }
.logo-3 { bottom: 14%; left: 10%; animation-delay: -3.1s; }
.logo-4 { bottom: 10%; right: 10%; animation-delay: -2.3s; }
.founder {
  width: min(400px, 70%);
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 0 16px rgba(255,255,255,.10)) drop-shadow(0 0 42px rgba(94,231,255,.10));
  animation: founderFloat 6.5s ease-in-out infinite;
}
.panel, .card, .callout, .table-shell, .auth-shell, .subpanel, details.shell { padding: 18px; }
.auth-shell { max-width: 880px; margin: 0 auto; }
.auth-grid, .dashboard-grid { grid-template-columns: 1.05fr .95fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4, .quick-grid { grid-template-columns: repeat(4, 1fr); }
.content-grid { grid-template-columns: 340px 1fr; }
.stats-grid { grid-template-columns: repeat(4, 1fr); }
.metric-value { font-size: 30px; font-weight: 800; line-height: 1; }
.card h3 { margin-top: 8px; }
.field-grid, .mini-grid, .two-col, .three-col { display: grid; gap: 14px; }
.field-grid { grid-template-columns: repeat(2, 1fr); }
.field.full, .field-span-2 { grid-column: 1 / -1; }
label, .label { display: block; margin-bottom: 8px; font-size: 13px; color: #fff0c2; letter-spacing: .08em; text-transform: uppercase; }
.section-head { display: grid; gap: 6px; margin-bottom: 10px; }
.tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.04);
  color: #f7edd5;
  padding: 10px 14px;
  cursor: pointer;
}
.tab.active { border-color: rgba(94,231,255,.36); box-shadow: 0 0 0 1px rgba(94,231,255,.18), 0 0 16px rgba(94,231,255,.10); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.lesson-stack, .prompt-stack, .timeline, .letter-preview, .login-copy, .teacher-deep, .note-stack { display: grid; gap: 12px; }
.lesson-card, .prompt-card, .timeline-item, .score-card, .student-id-card, .integration-card {
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px;
  padding: 16px;
  background: rgba(255,255,255,.03);
}
.lesson-card h4, .prompt-card h4, .timeline-item h4 { margin: 6px 0; }
.checklist { margin: 0; padding-left: 18px; color: var(--muted); }
.checklist li { margin: 7px 0; }
.split-panel {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 0;
  overflow: hidden;
}
.sidebar {
  border-right: 1px solid rgba(255,255,255,.08);
  padding: 18px;
  background: linear-gradient(180deg, rgba(12,16,28,.96), rgba(10,13,22,.86));
}
.sidebar nav { display: grid; gap: 8px; }
.sidebar a {
  text-decoration: none;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid transparent;
  background: rgba(255,255,255,.03);
  color: #f5efd8;
}
.sidebar a.active, .sidebar a:hover {
  border-color: rgba(94,231,255,.28);
  box-shadow: 0 0 0 1px rgba(94,231,255,.14), 0 0 16px rgba(94,231,255,.10);
}
.content-pane { padding: 18px; display: grid; gap: 18px; }
.table-shell { overflow: auto; }
.table { width: 100%; border-collapse: collapse; min-width: 900px; }
.table th, .table td { border-bottom: 1px solid rgba(255,255,255,.08); padding: 12px 10px; text-align: left; vertical-align: top; }
.table th { font-size: 12px; color: #fff0c2; letter-spacing: .14em; text-transform: uppercase; }
.table td input, .table td textarea, .table td select { min-width: 120px; }
.table td textarea { min-height: 80px; }
.student-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(89,241,179,.08);
  border: 1px solid rgba(89,241,179,.16);
  color: #ddfff2;
}
.id-output {
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 900;
  letter-spacing: .12em;
  color: #fff1bf;
}
.student-id-card {
  display: grid;
  gap: 12px;
  background: linear-gradient(135deg, rgba(139,92,246,.22), rgba(6,20,35,.94));
  box-shadow: var(--shadow-2);
}
.letter-preview {
  min-height: 260px;
  border: 1px dashed rgba(255,255,255,.14);
  border-radius: 16px;
  padding: 18px;
  background: rgba(255,255,255,.03);
}
.note-block { min-height: 160px; }
.score-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.score-grid input { text-align: center; }
.footer {
  margin-top: 18px;
  padding: 20px 0 10px;
  border-top: 1px solid rgba(255,255,255,.08);
}
.footer-links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.empty-state {
  border: 1px dashed rgba(255,255,255,.14);
  border-radius: 18px;
  padding: 18px;
  color: var(--muted);
  text-align: center;
}
.print-only { display: none; }
.route-guard { display: none; }
.hero-locks { display: grid; gap: 14px; }
.inline-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(255,255,255,.06);
  color: #fff2be;
}
@keyframes floatPulse {
  0%,100% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(-10px) scale(1.02); }
}
@keyframes founderFloat {
  0%,100% { transform: translateY(0px); }
  50% { transform: translateY(-14px); }
}
@media (max-width: 1180px) {
  .hero-grid, .auth-grid, .dashboard-grid, .content-grid, .split-panel, .stats-grid, .quick-grid, .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
  .split-panel { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.08); }
}
@media (max-width: 920px) {
  .topbar { position: static; }
  .topbar-inner, .main-nav, .hero-grid, .auth-grid, .dashboard-grid, .grid-2, .grid-3, .grid-4, .quick-grid, .field-grid, .content-grid, .stats-grid, .score-grid {
    grid-template-columns: 1fr;
  }
  .topbar-inner { flex-direction: column; align-items: stretch; }
  .main-nav { display: grid; }
  .hero-visual, .visual-panel { min-height: 420px; }
  .field.full, .field-span-2 { grid-column: auto; }
}
@media print {
  body { background: white; color: #111; }
  .topbar, .print-hide { display: none !important; }
  .site-shell { width: 100%; margin: 0; padding: 0; }
  .page { gap: 10px; padding-top: 0; }
  .hero, .panel, .card, .callout, .table-shell, .auth-shell, details.shell, .split-panel, .subpanel, .lesson-card, .prompt-card, .timeline-item, .student-id-card, .integration-card {
    box-shadow: none;
    border: 1px solid #cfd3dd;
    background: white;
    color: #111;
  }
  .muted, p, .lead { color: #333; }
  input, textarea, select { border: 1px solid #d2d5db; background: white; color: #111; }
  .print-only { display: block; }
}