* { box-sizing: border-box; }
:root {
  --india-blue: #0047ab;
  --india-royal: #0a5fd4;
  --india-navy: #06305f;
  --india-sky: #eaf6ff;
  --india-gold: #ffbf2e;
  --ink: #0b1936;
  --muted: #53677d;
  --line: #b9d9f3;
  --blue-bg: #eaf6ff;
  --blue-surface: #ffffff;
  --blue-panel: #d7edff;
  --blue-soft: #f4fbff;
  --gray-strong: #1e5b93;
  --gray-dark: #0b1936;
}
body { margin: 0; font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--ink); background: var(--blue-bg); }
a { color: inherit; text-decoration: none; }
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 18px; background: rgba(234,246,255,.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); box-shadow: 0 10px 30px rgba(0, 71, 171, .08); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 850; color: var(--gray-dark); }
.brand img { width: 42px; height: 42px; object-fit: contain; }
.nav { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.nav a, .link-button { color: var(--gray-strong); font-weight: 750; font-size: 14px; border-radius: 10px; min-height: 38px; display: inline-flex; align-items: center; padding: 8px 10px; }
.nav a:hover, .link-button:hover { background: var(--blue-panel); color: var(--india-blue); }
.nav a.active { background: var(--india-blue); color: #ffffff; box-shadow: 0 10px 24px rgba(0,71,171,.18); }
.nav .admin-switch, .nav .student-switch { background: var(--blue-surface); border: 1px solid var(--line); color: var(--india-blue); }
.nav .nav-cta { min-height: 40px; padding: 10px 14px; }
.link-button { border: 0; background: transparent; cursor: pointer; font-family: inherit; }
.nav a.btn { color: #ffffff; }
.nav a.btn:visited, .nav a.btn:hover, .nav a.btn:focus { color: #ffffff; }
.container { width: min(1120px, 100%); margin: 0 auto; padding: 28px 18px; }
.hero { display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(300px, .96fr); gap: 30px; align-items: center; padding: 44px 18px 22px; }
.hero h1 { margin: 0; color: var(--gray-dark); font-size: clamp(36px, 6vw, 68px); line-height: 1.02; letter-spacing: 0; text-wrap: balance; }
.hero p, .lead { color: var(--muted); font-size: 18px; line-height: 1.65; }
.hero-kicker { display: inline-flex; align-items: center; gap: 9px; color: var(--gray-dark); font-weight: 850; background: var(--blue-surface); border: 1px solid var(--line); box-shadow: 0 10px 24px rgba(0,71,171,.08); border-radius: 999px; padding: 8px 13px; margin-bottom: 16px; }
.hero-kicker::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--india-blue); box-shadow: 0 0 0 5px rgba(0,71,171,.16); }
.hero-visual { border-radius: 18px; background: var(--blue-surface); color: var(--ink); padding: 16px; box-shadow: 0 30px 76px rgba(0, 71, 171, .16); display: grid; gap: 16px; align-items: start; overflow: hidden; border: 1px solid var(--line); }
.hero-visual::before { content: none; }
.intro-video { width: 100%; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 18px 40px rgba(0,71,171,.16); background: var(--india-navy); aspect-ratio: 16 / 9; }
.intro-video video { display: block; width: 100%; height: 100%; border-radius: 0; object-fit: contain; background: var(--india-navy); }
.screen-card { background: var(--blue-soft); border: 1px solid var(--line); border-radius: 12px; padding: 18px; color: var(--ink); }
.screen-card h2 { color: var(--gray-dark); margin: 12px 0 8px; font-size: 24px; }
.screen-card p { color: var(--muted); font-weight: 600; line-height: 1.6; margin: 0; }
.screen-card .pill { background: var(--blue-panel); color: var(--india-blue); border: 1px solid var(--line); }
.trust { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 18px; }
.trust span, .pill { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 8px 12px; border-radius: 999px; background: var(--blue-panel); color: var(--gray-dark); font-weight: 800; font-size: 13px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.btn { border: 0; border-radius: 12px; background: linear-gradient(135deg, var(--india-blue), var(--india-royal)); color: #ffffff; min-height: 46px; padding: 12px 18px; font-weight: 850; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; box-shadow: 0 14px 30px rgba(0,71,171,.22); }
.btn:visited, .btn:hover, .btn:focus { color: #ffffff; }
.btn.secondary { background: var(--india-navy); }
.btn.ghost { background: var(--blue-surface); color: var(--india-blue); box-shadow: 0 10px 26px rgba(0,71,171,.1); border: 1px solid var(--line); }
.section { padding: 30px 0; }
.section h2 { color: var(--gray-dark); font-size: clamp(26px, 4vw, 40px); margin: 0 0 10px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.card { background: var(--blue-surface); border: 1px solid var(--line); border-radius: 10px; padding: 20px; box-shadow: 0 18px 44px rgba(0,71,171,.08); }
.card h3 { color: var(--gray-dark); margin: 0 0 8px; }
.card p { color: #5a6e83; line-height: 1.55; }
.metric { font-size: 28px; font-weight: 850; color: var(--gray-dark); }
.alert { border-radius: 8px; padding: 12px 14px; margin: 12px 0; font-weight: 650; }
.alert.success { background: #dff7ea; color: #115c35; }
.alert.error { background: #ffe7e7; color: #9f1d1d; }
.form { display: grid; gap: 14px; }
.field label { display: block; font-weight: 750; margin-bottom: 6px; color: var(--gray-dark); }
.field input, .field select, .field textarea { width: 100%; min-height: 46px; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--blue-soft); font: inherit; }
.field-error { color: #b42318; font-size: 13px; margin-top: 4px; }
.captcha-field { display: grid; gap: 8px; }
.captcha-box { display: inline-flex; align-items: center; min-height: 46px; width: fit-content; min-width: 150px; border-radius: 10px; padding: 10px 16px; background: var(--blue-panel); border: 1px solid var(--line); color: var(--india-blue); font-weight: 900; letter-spacing: .04em; }
.auth-shell { width: min(520px, 100%); margin: 0 auto; }
.dashboard-shell { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 18px; }
.side { position: sticky; top: 84px; align-self: start; }
.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 18px; }
video { width: 100%; border-radius: 12px; background: var(--india-navy); aspect-ratio: 16 / 9; }
.lesson-list { max-height: 70vh; overflow: auto; }
.lesson-link { display: block; padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--gray-strong); }
.table-card { width: 100%; border-collapse: collapse; background: var(--blue-surface); border-radius: 8px; overflow: hidden; }
.table-card th, .table-card td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.footer { background: var(--gray-dark); color: #f3f4f6; margin-top: 38px; }
.footer .container { display: grid; gap: 10px; }
.sticky-cta { display: none; position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 30; }
.upload-row { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; padding: 14px 0; border-top: 1px solid var(--line); }
.inline-upload { grid-template-columns: minmax(0, 1fr) auto; align-items: center; }
.inline-upload input[type="file"] { min-height: 42px; border: 1px solid var(--line); border-radius: 10px; background: var(--blue-soft); padding: 8px; width: 100%; }
.policy-card { max-width: 900px; margin: 0 auto; }
.policy-card h1 { margin-bottom: 6px; }
.policy-card h2 { color: var(--gray-dark); margin: 28px 0 8px; font-size: 22px; }
.policy-card p { color: #4d6176; line-height: 1.7; }
.policy-tabs { margin: 18px 0 24px; }
@media (max-width: 820px) {
  .hero, .dashboard-shell, .lesson-layout, .grid.two { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
  .trust { grid-template-columns: repeat(2, 1fr); }
  .hero-visual { min-height: auto; grid-template-columns: 1fr; padding: 14px; gap: 14px; justify-items: stretch; }
  .intro-video { width: 100%; max-height: none; }
  .screen-card { width: 100%; min-height: auto; padding: 18px; align-self: stretch; }
  .topbar { align-items: flex-start; flex-direction: column; gap: 10px; }
  .brand img { width: 36px; height: 36px; }
  .nav { justify-content: flex-start; width: 100%; gap: 8px; }
  .nav a, .link-button { font-size: 13px; min-height: 36px; padding: 7px 9px; }
  .nav a.hide-mobile { display: none; }
  .side { position: static; }
  .sticky-cta { display: block; }
  .table-card, .table-card tbody, .table-card tr, .table-card td { display: block; width: 100%; }
  .table-card thead { display: none; }
  .table-card tr { border-bottom: 12px solid var(--blue-bg); }
  .inline-upload { grid-template-columns: 1fr; }
}