/* SyllaVue web: the app's colours (MathsRevision/Brand/Theme.swift), light and dark. */
:root {
  --indigo: #0F1F4B;
  --indigo-lift: #1D3577;
  --teal: #14B8A6;
  --mint: #6EE7C8;
  --sky: #60A5FA;
  --bg: #F4F7FE;
  --card: #FFFFFF;
  --card-raised: #E8F1FF;
  --ink: #0F1F4B;
  --ink-2: #5B6B8C;
  --hairline: #E2E8F5;
  --shadow: 0 8px 24px rgba(15, 31, 75, 0.07);
  --good: #0E9F8E;
  --warn: #D97706;
  --bad: #E11D48;
  --radius: 22px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A1430;
    --card: #14224A;
    --card-raised: #1C2C5C;
    --ink: #F4F7FE;
    --ink-2: #A9B6D3;
    --hairline: #22325F;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; line-height: 1.2; }
h1 { font-size: clamp(26px, 4vw, 34px); letter-spacing: -0.02em; }
h2 { font-size: 20px; letter-spacing: -0.01em; }
h3 { font-size: 16px; }
p { margin: 0; }
.muted { color: var(--ink-2); }
.small { font-size: 13px; }
.tiny { font-size: 12px; }
.num { font-variant-numeric: tabular-nums; }

.boot { min-height: 100vh; display: grid; place-content: center; justify-items: center; gap: 14px; color: var(--ink-2); }

/* ---------------------------------------------------------------- layout */
.shell { min-height: 100vh; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 18px;
  padding: 12px max(16px, calc((100vw - 1080px) / 2));
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none !important; }
.brand img { width: 34px; height: 34px; }
.wordmark { font-weight: 800; font-size: 22px; letter-spacing: -0.02em; }
.wordmark span { color: var(--teal); }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  display: flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 999px;
  color: var(--ink-2); font-weight: 600; font-size: 15px; text-decoration: none;
}
.nav a:hover { background: var(--card-raised); color: var(--ink); }
.nav a.active { background: var(--card); color: var(--teal); box-shadow: var(--shadow); }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--teal), var(--mint)); color: #fff; font-weight: 800; font-size: 14px;
}
main { width: 100%; max-width: 1080px; margin: 0 auto; padding: 24px 16px 96px; display: grid; gap: 22px; }

@media (max-width: 720px) {
  /* A blurred header would trap the fixed tab bar inside it. */
  .topbar { gap: 10px; backdrop-filter: none; background: var(--bg); }
  .trend { display: none; }
  .topbar .avatar { margin-left: auto; }
  .nav {
    position: fixed; left: 12px; right: 12px; bottom: max(12px, env(safe-area-inset-bottom)); z-index: 20;
    justify-content: space-around; padding: 6px; border-radius: 999px;
    background: color-mix(in srgb, var(--card) 92%, transparent); backdrop-filter: blur(16px);
    box-shadow: 0 10px 30px rgba(15, 31, 75, 0.18); border: 1px solid var(--hairline);
  }
  .nav a { flex-direction: column; gap: 2px; padding: 6px 10px; font-size: 11px; }
  .nav a.active { box-shadow: none; }
  .wordmark { font-size: 20px; }
}

/* ---------------------------------------------------------------- building blocks */
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.card.flush { padding: 0; overflow: hidden; }
.section { display: grid; gap: 12px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 12px; }
.section-head p { font-size: 14px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; align-items: start; }
.row {
  display: flex; align-items: center; gap: 14px; padding: 14px 18px;
  border-top: 1px solid var(--hairline); color: var(--ink); text-decoration: none !important;
}
.row:first-child { border-top: none; }
a.row:hover, button.row:hover { background: color-mix(in srgb, var(--card-raised) 55%, transparent); }
button.row { width: 100%; background: none; border: none; text-align: left; cursor: pointer; }
.row .grow { flex: 1; min-width: 0; }
.row .title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; }
.chev { color: var(--ink-2); font-size: 20px; line-height: 1; }
.icon {
  width: 42px; height: 42px; flex: none; border-radius: 12px; display: grid; place-items: center;
  font-weight: 800; font-size: 14px;
}
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 700; background: var(--card-raised); color: var(--ink-2);
}
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.filter {
  padding: 8px 14px; border-radius: 999px; border: none; cursor: pointer; font-weight: 600; font-size: 14px;
  background: var(--card); color: var(--ink); box-shadow: var(--shadow);
}
.filter.on { background: var(--teal); color: #fff; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 18px;
  border-radius: 14px; border: none; cursor: pointer; font-weight: 700; text-decoration: none !important;
  background: linear-gradient(180deg, #2DD4BF, var(--teal)); color: #fff; box-shadow: 0 6px 16px rgba(20, 184, 166, 0.3);
}
.btn.secondary { background: var(--card-raised); color: var(--ink); box-shadow: none; }
.btn.danger { background: none; color: var(--bad); box-shadow: none; padding-left: 0; }
.btn:disabled { opacity: 0.5; cursor: default; }
.bar { height: 6px; border-radius: 3px; background: var(--hairline); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 3px; }
.grade {
  min-width: 56px; padding: 6px 8px; border-radius: 14px; text-align: center; line-height: 1.1;
}
.grade b { display: block; font-size: 24px; }
.grade small { font-size: 11px; color: var(--ink-2); }
.empty { text-align: center; padding: 34px 20px; color: var(--ink-2); display: grid; gap: 8px; justify-items: center; }
.error { color: var(--bad); }
.notice { background: var(--card-raised); border-radius: 16px; padding: 14px 16px; font-size: 14px; }

/* ---------------------------------------------------------------- home */
.hero {
  border-radius: 28px; padding: 26px; color: #fff; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--indigo-lift), var(--indigo));
}
.hero .eyebrow { color: var(--mint); font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.hero .days { font-size: clamp(64px, 12vw, 96px); font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.hero .days small { font-size: 22px; font-weight: 600; letter-spacing: 0; opacity: 0.8; margin-left: 10px; }
.hero .pills { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 4px; margin-top: 18px; scrollbar-width: none; }
.hero .pill {
  flex: none; min-width: 150px; padding: 12px 14px; border-radius: 16px; text-align: left; cursor: pointer;
  background: rgba(255, 255, 255, 0.08); border: 1px solid rgba(255, 255, 255, 0.14); color: #fff;
}
.hero .pill.on { border-color: var(--mint); background: rgba(255, 255, 255, 0.16); }
.hero .pill b { display: block; font-size: 15px; }
.hero .pill span { font-size: 13px; opacity: 0.75; }
.hero .watermark { position: absolute; right: -30px; top: -20px; width: 220px; opacity: 0.08; }
.spark { width: 72px; height: 26px; }

/* ---------------------------------------------------------------- results and syllabus */
.question { padding: 14px 18px; border-top: 1px solid var(--hairline); display: grid; gap: 6px; }
.question:first-child { border-top: none; }
.question header { display: flex; gap: 10px; align-items: baseline; }
.question .qnum { font-weight: 800; min-width: 44px; }
.question .marks { margin-left: auto; font-weight: 800; white-space: nowrap; }
.pages { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; }
.pages a { display: block; border-radius: 12px; overflow: hidden; background: var(--card-raised); aspect-ratio: 3 / 4; }
.pages img { width: 100%; height: 100%; object-fit: cover; display: block; }
.topic { display: grid; gap: 6px; padding: 12px 18px; border-top: 1px solid var(--hairline); }
.topic:first-child { border-top: none; }
.topic summary { display: flex; align-items: center; gap: 12px; cursor: pointer; list-style: none; }
.topic summary::-webkit-details-marker { display: none; }
.points { display: grid; gap: 8px; padding: 6px 0 4px 52px; }
.points li { list-style: none; display: grid; gap: 2px; font-size: 14px; }
.points ul { margin: 0; padding: 0; display: grid; gap: 10px; }
.tag { font: 600 11px ui-monospace, SFMono-Regular, Menlo, monospace; padding: 2px 6px; border-radius: 6px; background: var(--card-raised); color: var(--ink-2); }
.heat-always { color: #EA580C; }
.heat-regular { color: #F59E0B; }
.heat-occasional, .heat-never { color: #64748B; }

/* ---------------------------------------------------------------- calendar */
.months { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.month h3 { margin-bottom: 10px; }
.days7 { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; text-align: center; }
.days7 .dow { font-size: 11px; font-weight: 700; color: var(--ink-2); padding-bottom: 4px; }
.day { aspect-ratio: 1; display: grid; place-items: center; border-radius: 10px; font-size: 14px; color: var(--ink-2); }
.day.exam { color: #fff; font-weight: 800; cursor: pointer; }
.day.mock { border: 2px dashed; font-weight: 800; cursor: pointer; }
.day.today { color: var(--teal); font-weight: 800; }
.gap { text-align: center; color: var(--ink-2); font-size: 14px; grid-column: 1 / -1; margin: 0; }

/* ---------------------------------------------------------------- forms */
dialog {
  border: none; border-radius: 24px; padding: 0; width: min(440px, calc(100vw - 32px));
  background: var(--card); color: var(--ink); box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}
dialog::backdrop { background: rgba(10, 20, 48, 0.45); }
dialog form { display: grid; gap: 14px; padding: 22px; }
label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; }
input, select, textarea {
  font: inherit; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--hairline);
  background: var(--bg); color: var(--ink);
}
.actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; }

/* ---------------------------------------------------------------- sign in */
.signin { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.signin .card { max-width: 420px; width: 100%; display: grid; gap: 18px; justify-items: center; text-align: center; padding: 34px 26px; }
.signin img { width: 96px; height: 96px; filter: drop-shadow(0 12px 20px rgba(15, 31, 75, 0.25)); }
.signin .wordmark { font-size: 40px; }
#google-button { min-height: 44px; }