:root {
  --primary: #1d4ed8;
  --primary-soft: #e2e9fb;
  --accent: #0e9f6e;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #182033;
  --muted: #5d6679;
  --border: #e3e7ef;
  --good: #0e7a55; --good-bg: #e3f6ee;
  --info: #1d4ed8; --info-bg: #e2e9fb;
  --warn: #8a5a00; --warn-bg: #fdf1d8;
  --bad: #b42318;  --bad-bg: #fde8e7;
  --radius: 14px;
  --tabs-h: 64px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #7aa2ff; --primary-soft: #1d2a4d;
    --bg: #0f1420; --surface: #182032; --text: #e8ecf5; --muted: #9aa4b8; --border: #26304a;
    --good: #5fd3a5; --good-bg: #133528; --info: #8fb0ff; --info-bg: #1c2a4f;
    --warn: #f3c46b; --warn-bg: #3a2d10; --bad: #ff8a80; --bad-bg: #42191a;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh;
  padding-bottom: calc(var(--tabs-h) + env(safe-area-inset-bottom));
}
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 8px;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: var(--primary); color: #fff;
}
.top__brand { flex: 1; font-weight: 700; font-size: 17px; }
.icon-btn {
  width: 40px; height: 40px; border: 0; border-radius: 50%;
  background: rgba(255,255,255,.15); color: #fff; font-size: 20px; cursor: pointer;
}
.children { display: flex; gap: 8px; overflow-x: auto; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--border); }
.chip { flex: none; border: 1px solid var(--border); background: var(--surface); color: var(--text); border-radius: 999px; padding: 6px 14px; font: inherit; cursor: pointer; }
.chip.is-active { background: var(--primary); border-color: var(--primary); color: #fff; }
.view { padding: 16px; max-width: 720px; margin: 0 auto; }
.title { font-size: 22px; margin: 4px 0 14px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 14px; }
.card--list { padding: 4px 16px; }
.card__title { font-size: 15px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 0 0 10px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 14px; }
.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 8px; text-align: center; }
.stat strong { display: block; font-size: 22px; }
.stat span { font-size: 12px; color: var(--muted); }
.course { padding: 8px 0; }
.course + .course { border-top: 1px solid var(--border); }
.course__row { display: flex; justify-content: space-between; gap: 8px; }
.course small { color: var(--muted); }
.bar { height: 8px; background: var(--primary-soft); border-radius: 999px; overflow: hidden; margin: 6px 0 4px; }
.bar span { display: block; height: 100%; background: var(--accent); border-radius: inherit; }
.row { display: flex; flex-wrap: wrap; gap: 6px 12px; padding: 12px 0; }
.row + .row { border-top: 1px solid var(--border); }
.row__main { flex: 1 1 60%; min-width: 0; }
.row__main h3 { font-size: 16px; margin: 0 0 2px; }
.row__main small, .row__side small { color: var(--muted); }
.row__side { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.score { font-size: 15px; }
.note { flex-basis: 100%; margin: 4px 0 0; padding: 8px 10px; border-radius: 10px; background: var(--info-bg); font-size: 14px; }
.note--parent { background: var(--good-bg); }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; }
.badge--good { background: var(--good-bg); color: var(--good); }
.badge--info { background: var(--info-bg); color: var(--info); }
.badge--warn { background: var(--warn-bg); color: var(--warn); }
.badge--bad  { background: var(--bad-bg);  color: var(--bad); }
.badge--muted { background: var(--border); color: var(--muted); }
.alert { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 14px; font-weight: 600; }
.alert--warn { background: var(--warn-bg); color: var(--warn); }
.alert--bad { background: var(--bad-bg); color: var(--bad); }
.alert--info { background: var(--info-bg); color: var(--info); }
.alert small { display: block; font-weight: 400; opacity: .9; margin-top: 2px; }
.muted { color: var(--muted); }
.subtitle { font-size: 16px; margin: 18px 0 8px; }
.flags { flex-basis: 100%; display: flex; flex-wrap: wrap; gap: 6px; }
.flag { font-size: 12px; padding: 2px 8px; border-radius: 8px; background: var(--border); color: var(--muted); }
.flag--warn { background: var(--warn-bg); color: var(--warn); }
.flag--good { background: var(--good-bg); color: var(--good); }
.small { font-size: 13px; }
.btn {
  display: inline-block; text-align: center; text-decoration: none; cursor: pointer;
  background: var(--primary); color: #fff; border: 0; border-radius: 12px;
  padding: 12px 18px; font: inherit; font-weight: 600;
}
.btn--small { padding: 6px 14px; font-size: 14px; }
.btn--ghost { background: var(--primary-soft); color: var(--primary); }
.btn--danger { background: var(--bad-bg); color: var(--bad); }
.link { background: none; border: 0; padding: 8px 0 0; color: var(--primary); font: inherit; font-weight: 600; cursor: pointer; }
.state { text-align: center; padding: 48px 16px; }
.state h2 { margin: 0 0 8px; }
.state p { color: var(--muted); margin: 0 0 18px; }
.spinner { width: 32px; height: 32px; margin: 0 auto 12px; border: 3px solid var(--primary-soft); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.tabs {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 5;
  display: grid; grid-template-columns: repeat(4, 1fr);
  height: calc(var(--tabs-h) + env(safe-area-inset-bottom)); padding-bottom: env(safe-area-inset-bottom);
  background: var(--surface); border-top: 1px solid var(--border);
}
.tabs button { border: 0; background: none; color: var(--muted); font: 12px/1.2 inherit; font-family: inherit; cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; }
.tabs button span { font-size: 20px; }
.tabs button.is-active { color: var(--primary); font-weight: 700; }
.sheet { border: 0; border-radius: 18px; padding: 20px; width: min(92vw, 380px); background: var(--surface); color: var(--text); }
.sheet::backdrop { background: rgba(10, 15, 30, .45); }
.sheet form { display: flex; flex-direction: column; gap: 10px; }
.sheet__name { font-weight: 700; margin: 0 0 4px; text-align: center; }
[hidden] { display: none !important; }

.push { border: 1px solid var(--border); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.push__title { font-weight: 700; margin: 0; }
.push__note { margin: 0; font-size: 13px; color: var(--muted); }
.push__prefs { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
.push__prefs label { display: flex; gap: 8px; align-items: center; }

/* Staff view */
.chips { display: flex; gap: 8px; overflow-x: auto; margin-bottom: 12px; }
.stats--4 { grid-template-columns: repeat(4, 1fr); gap: 8px; }
.stats--4 .stat strong { font-size: 20px; }
.stats--4 .stat span { font-size: 11px; }
.search { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.search input { flex: 1; min-width: 0; font: inherit; padding: 9px 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--text); }
.row--button { width: 100%; text-align: left; background: none; border: 0; border-radius: 0; font: inherit; color: inherit; cursor: pointer; }
.row--button + .row--button { border-top: 1px solid var(--border); }
.row--button .row__main small { display: block; }
.alert-line { font-weight: 600; }
.alert-line--bad { color: var(--bad); }
.alert-line--warn { color: var(--warn); }
.alert-line--info { color: var(--info); }
.alert__actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; font-weight: 400; }
.alert__actions .chip { font-size: 13px; padding: 4px 10px; }
.alert--bad .alert__actions .chip, .alert--warn .alert__actions .chip { background: rgba(255,255,255,.7); }
.title--sub { font-size: 19px; margin-top: 24px; }

/* Grading */
.grade-form { display: flex; flex-direction: column; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 14px; font-weight: 600; flex: 1; min-width: 0; }
.field small { font-weight: 400; color: var(--muted); }
.field input, .field select, .field textarea { font: inherit; font-weight: 400; padding: 9px 11px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--text); width: 100%; }
.field-row { display: flex; gap: 10px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; }
.submission { white-space: pre-wrap; background: var(--bg); border-radius: 10px; padding: 10px; font-size: 14px; margin: 0; }
.row__actions { flex-basis: 100%; display: flex; justify-content: flex-end; }
.toast { position: fixed; left: 50%; bottom: calc(var(--tabs-h) + 16px + env(safe-area-inset-bottom)); transform: translateX(-50%); background: var(--text); color: var(--surface); padding: 10px 18px; border-radius: 999px; font-weight: 600; z-index: 20; }

/* AI tutor */
.chat { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.bubble { max-width: 88%; padding: 10px 14px; border-radius: 16px; font-size: 15px; line-height: 1.45; }
.bubble p { margin: 0 0 6px; } .bubble p:last-child { margin-bottom: 0; }
.bubble ul { margin: 0 0 6px; padding-left: 18px; }
.bubble--user { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.bubble--tutor { align-self: flex-start; background: var(--surface); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.bubble--typing { display: flex; gap: 4px; padding: 14px; }
.bubble--typing span { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite; }
.bubble--typing span:nth-child(2) { animation-delay: .2s; } .bubble--typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }
.chips--wrap { flex-wrap: wrap; overflow: visible; }
.chips--wrap .chip { font-size: 13px; padding: 5px 11px; }
.composer { display: flex; gap: 8px; align-items: flex-end; }
.composer textarea { flex: 1; font: inherit; padding: 10px 12px; border: 1px solid var(--border); border-radius: 14px; resize: none; background: var(--surface); color: var(--text); }

/* Messaging */
.bubble__meta { display: block; font-size: 11px; opacity: .75; margin-top: 4px; }
.tg-card { display: flex; gap: 12px; align-items: center; justify-content: space-between; }
.tabs button { position: relative; }
.tab-badge { position: absolute; top: 6px; left: calc(50% + 8px); min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px; background: var(--bad); color: #fff; font-size: 11px; line-height: 18px; }

/* Attendance & participation (teacher) */
.att { display: flex; flex-direction: column; gap: 8px; }
.att__name { margin: 0; font-size: 16px; }
.seg { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.seg--rate { grid-template-columns: repeat(3, 1fr); }
.seg__btn { font: inherit; font-size: 13px; padding: 9px 4px; border: 0; border-left: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer; }
.seg__btn:first-child { border-left: 0; }
.seg__btn.is-on { font-weight: 700; }
.seg__btn--attended, .seg__btn--p3 { background: var(--good-bg); color: var(--good); }
.seg__btn--partial, .seg__btn--p1 { background: var(--warn-bg); color: var(--warn); }
.seg__btn--missed { background: var(--bad-bg); color: var(--bad); }
.seg__btn--excused, .seg__btn--p2 { background: var(--info-bg); color: var(--info); }
.att-note { display: flex; flex-direction: column; gap: 8px; }
.att-note__actions { display: flex; gap: 12px; align-items: center; }
.teacher-note { margin: 6px 0 0; font-size: 14px; }
.teacher-note span { color: var(--muted); }

/* Feedback box: type, tap a phrase, or speak */
.fb__wrap { position: relative; }
.fb__wrap textarea { padding-right: 52px; }
.fb__tools { position: absolute; top: 6px; right: 6px; display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.mic { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); font-size: 18px; cursor: pointer; }
.mic.is-live { background: var(--bad-bg); border-color: var(--bad); animation: mic-pulse 1.2s ease-in-out infinite; }
@keyframes mic-pulse { 50% { box-shadow: 0 0 0 6px rgba(220, 38, 38, .15); } }
.fb__label { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.fb__lang { font-size: 12px; font-weight: 400; }
.fb__phrases { margin: 6px 0 0; font-weight: 400; padding-bottom: 2px; }
.fb__phrases .chip { font-size: 13px; padding: 5px 11px; }