:root {
  --brand: #C8102E;
  --brand-dark: #A00D25;
  --ink: #16161A;
  --muted: #6E6E78;
  --line: #E7E7EC;
  --bg: #F5F5F7;
  --card: #FFFFFF;
  --ok: #0F7B3E;
  --ok-bg: #E6F4EC;
  --warn: #8A5A00;
  --warn-bg: #FFF3D6;
  --bad: #A4123A;
  --bad-bg: #FDE7EC;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,20,30,.06), 0 4px 16px rgba(20,20,30,.05);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: env(safe-area-inset-bottom);
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand img { border-radius: 7px; flex: none; }
.brand strong { display: block; font-size: 15px; font-weight: 800; letter-spacing: -.01em; }
.brand span { display: block; font-size: 11px; color: var(--muted); }

.ghost-btn {
  flex: none; border: 1px solid var(--line); background: #fff; color: var(--muted);
  font: inherit; font-size: 13px; font-weight: 600; padding: 7px 13px;
  border-radius: 999px; cursor: pointer;
}
.ghost-btn:hover { border-color: #D0D0D8; color: var(--ink); }

/* ---------- layout ---------- */
#main { max-width: 560px; margin: 0 auto; padding: 16px 16px 40px; }
.view { display: grid; gap: 14px; }
.card {
  background: var(--card); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.card h2 {
  margin: 0 0 12px; font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em; color: var(--muted);
}
.muted-card { background: #FCFCFD; box-shadow: none; border: 1px solid var(--line); }

/* ---------- auth ---------- */
.auth-card h1 { margin: 0 0 6px; font-size: 24px; font-weight: 800; letter-spacing: -.02em; }
.lede { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
.steps { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; }
.steps i { flex: 1; height: 2px; background: var(--line); }
.step {
  width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  background: var(--line); color: var(--muted); font-size: 12px; font-weight: 700;
}
.step.is-on { background: var(--brand); color: #fff; }

label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 6px; }
input[type=text], input[type=email] {
  width: 100%; padding: 13px 14px; font: inherit; font-size: 16px;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(200,16,46,.12); }
#studentId, #siStudentId { text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }

.primary-btn {
  width: 100%; margin-top: 20px; padding: 15px; font: inherit; font-size: 16px; font-weight: 700;
  color: #fff; background: var(--brand); border: none; border-radius: 11px; cursor: pointer;
}
.primary-btn:hover { background: var(--brand-dark); }
.primary-btn:disabled { opacity: .55; cursor: progress; }

.link-btn {
  display: block; width: 100%; margin-top: 12px; padding: 6px; background: none; border: none;
  font: inherit; font-size: 13px; font-weight: 600; color: var(--muted); cursor: pointer; text-decoration: underline;
}
.link-btn:hover { color: var(--brand); }

/* ---------- messages ---------- */
.err, .ok {
  margin: 14px 0 0; padding: 11px 13px; border-radius: 9px;
  font-size: 13.5px; font-weight: 500;
}
.err { background: var(--bad-bg); color: var(--bad); }
.ok  { background: var(--ok-bg);  color: var(--ok); }

/* ---------- signed-in header ---------- */
.hello-card { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.eyebrow { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 700; }
.hello-card h1 { margin: 2px 0 0; font-size: 20px; font-weight: 800; letter-spacing: -.02em; }
.hello-card .sub { margin: 2px 0 0; font-size: 13px; color: var(--muted); }
.week-pill {
  flex: none; text-align: center; padding: 10px 14px;
  background: var(--bg); border-radius: 11px;
}
.week-pill strong { display: block; font-size: 19px; font-weight: 800; }
.week-pill span { font-size: 10.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }

/* ---------- session card ---------- */
.session-card { text-align: center; }
.session-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.badge {
  padding: 4px 11px; border-radius: 999px; font-size: 11px; font-weight: 800;
  text-transform: uppercase; letter-spacing: .05em; background: var(--bg); color: var(--muted);
}
.badge.live    { background: var(--bad-bg); color: var(--bad); }
.badge.open    { background: var(--ok-bg);  color: var(--ok); }
.badge.grace   { background: var(--warn-bg); color: var(--warn); }
.countdown { font-size: 13px; font-weight: 700; color: var(--muted); font-variant-numeric: tabular-nums; }
.session-card h2 {
  margin: 0; font-size: 21px; font-weight: 800; letter-spacing: -.02em;
  text-transform: none; color: var(--ink);
}
.session-time { margin: 5px 0 0; font-size: 14px; color: var(--muted); }

.clock-state {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  margin: 18px 0 0; padding: 14px; background: var(--bg); border-radius: 11px;
}
.clock-state div { text-align: center; }
.clock-state span { display: block; font-size: 10.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 700; }
.clock-state strong { display: block; font-size: 16px; font-weight: 800; margin-top: 2px; font-variant-numeric: tabular-nums; }

.action-btn {
  width: 100%; margin-top: 18px; padding: 19px; font: inherit; font-size: 17px; font-weight: 800;
  color: #fff; background: var(--brand); border: none; border-radius: 13px; cursor: pointer;
  letter-spacing: -.01em;
}
.action-btn.out { background: var(--ink); }
.action-btn:hover { filter: brightness(.93); }
.action-btn:disabled { opacity: .55; cursor: progress; filter: none; }

.geo-note { margin: 11px 0 0; font-size: 12px; color: var(--muted); min-height: 16px; }

/* ---------- history ---------- */
.history { display: grid; gap: 8px; }
.hrow {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 11px 13px; background: var(--bg); border-radius: 10px;
}
.hrow .hname { font-size: 13.5px; font-weight: 700; }
.hrow .hmeta { font-size: 11.5px; color: var(--muted); margin-top: 1px; }
.tag {
  flex: none; padding: 3px 9px; border-radius: 999px; font-size: 11px; font-weight: 800;
}
.tag.present { background: var(--ok-bg);  color: var(--ok); }
.tag.late    { background: var(--warn-bg); color: var(--warn); }
.tag.absent  { background: var(--bad-bg); color: var(--bad); }
.empty { margin: 0; color: var(--muted); font-size: 13px; text-align: center; padding: 14px 0; }

/* ---------- course standing ---------- */
.course-card { border-top: 3px solid var(--muted); }
.course-card.on_track, .course-card.passed { border-top-color: var(--ok); }
.course-card.behind                         { border-top-color: var(--warn); }
.course-card.at_risk, .course-card.critical { border-top-color: var(--bad); }
.course-card.unreachable, .course-card.failed { border-top-color: var(--bad); }

.course-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.course-top h2 { margin: 2px 0 0; font-size: 15px; font-weight: 700; text-transform: none;
  letter-spacing: -.01em; color: var(--ink); }
.course-badge {
  flex: none; padding: 5px 11px; border-radius: 999px; font-size: 11px; font-weight: 800;
  text-transform: uppercase; letter-spacing: .05em; background: var(--bg); color: var(--muted);
}
.course-badge.on_track, .course-badge.passed { background: var(--ok-bg); color: var(--ok); }
.course-badge.behind    { background: var(--warn-bg); color: var(--warn); }
.course-badge.at_risk, .course-badge.critical,
.course-badge.unreachable, .course-badge.failed { background: var(--bad-bg); color: var(--bad); }

.meter-track {
  position: relative; height: 12px; border-radius: 999px; background: var(--line); overflow: visible;
}
.meter-fill {
  height: 100%; border-radius: 999px; background: var(--ok); width: 0;
  transition: width .5s cubic-bezier(.4,0,.2,1);
}
.meter-fill.behind  { background: var(--warn); }
.meter-fill.at_risk, .meter-fill.critical,
.meter-fill.unreachable, .meter-fill.failed { background: var(--bad); }
.meter-mark {
  position: absolute; top: -5px; bottom: -5px; width: 2px; background: var(--ink); opacity: .55;
}
.meter-mark span {
  position: absolute; top: -17px; left: 50%; transform: translateX(-50%);
  font-size: 10px; font-weight: 800; color: var(--muted); white-space: nowrap;
}
.meter-legend {
  display: flex; justify-content: space-between; gap: 10px; margin-top: 12px;
  font-size: 12px; color: var(--muted);
}
.meter-legend strong { color: var(--ink); font-size: 15px; font-weight: 800; }
.meter { margin-top: 6px; }

.course-msg {
  margin: 16px 0 0; padding: 11px 13px; border-radius: 9px; background: var(--bg);
  font-size: 13px; line-height: 1.5; color: var(--ink);
}
.course-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 14px;
}
.course-grid div { text-align: center; padding: 10px 4px; background: var(--bg); border-radius: 9px; }
.course-grid span { display: block; font-size: 10px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--muted); font-weight: 700; line-height: 1.3; }
.course-grid strong { display: block; font-size: 17px; font-weight: 800; margin-top: 3px; }
.course-grid small { display: block; font-size: 10px; color: var(--muted); margin-top: 1px; }
@media (max-width: 400px) { .course-grid { grid-template-columns: repeat(2, 1fr); } }

/* ---------- my attendance ---------- */
.record-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.record-head h2 { margin: 0; }
.record-rate { text-align: right; flex: none; }
.record-rate strong { display: block; font-size: 22px; font-weight: 800; line-height: 1; letter-spacing: -.02em; }
.record-rate span { font-size: 11px; color: var(--muted); }

.weeks { display: grid; gap: 10px; }
.week {
  border: 1px solid var(--line); border-radius: 11px; overflow: hidden; background: var(--card);
}
.week.now { border-color: var(--brand); box-shadow: 0 0 0 2px rgba(200,16,46,.08); }
.week-top {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 13px; background: var(--bg); cursor: pointer; user-select: none;
}
.week-top:hover { filter: brightness(.98); }
.week-when { font-size: 13px; font-weight: 700; }
.week-when em { font-style: normal; color: var(--brand); font-size: 10.5px; text-transform: uppercase;
  letter-spacing: .05em; margin-left: 6px; }
.week-score { display: flex; align-items: center; gap: 9px; flex: none; }
.week-score b { font-size: 13.5px; font-weight: 800; font-variant-numeric: tabular-nums; }
.week-chev { color: var(--muted); font-size: 11px; transition: transform .15s ease; }
.week.open .week-chev { transform: rotate(90deg); }

.week-body { display: none; padding: 4px 13px 11px; }
.week.open .week-body { display: block; }
.srow {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 9px 0; border-bottom: 1px solid var(--line);
}
.srow:last-child { border-bottom: none; }
.srow-name { font-size: 13px; font-weight: 600; }
.srow-meta { font-size: 11px; color: var(--muted); margin-top: 1px; }
.bar { display: flex; gap: 3px; }
.bar i {
  width: 16px; height: 6px; border-radius: 3px; background: var(--line); display: block;
}
.bar i.present { background: var(--ok); }
.bar i.late    { background: var(--warn); }
.bar i.absent  { background: var(--bad); }

/* ---------- timetable ---------- */
.tt { width: 100%; border-collapse: collapse; font-size: 13px; }
.tt td { padding: 7px 0; border-bottom: 1px solid var(--line); color: var(--ink); }
.tt tr:last-child td { border-bottom: none; }
.tt td:first-child { font-weight: 700; width: 74px; }
.tt td:nth-child(2) { color: var(--muted); }
.tt .num { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; white-space: nowrap; }
.fine { margin: 12px 0 0; font-size: 11.5px; color: var(--muted); line-height: 1.55; }

/* ---------- install prompt ---------- */
.install-bar {
  position: fixed; left: 12px; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom));
  max-width: 536px; margin: 0 auto; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  padding: 11px 12px 11px 16px; background: var(--ink); color: #fff;
  border-radius: 12px; box-shadow: 0 8px 30px rgba(0,0,0,.25); font-size: 13.5px; font-weight: 600;
}
.install-bar span { flex: 1; }
.install-bar button {
  font: inherit; font-size: 13px; font-weight: 700; border: none; cursor: pointer;
  padding: 7px 13px; border-radius: 8px; background: var(--brand); color: #fff;
}
#installClose { background: transparent; color: rgba(255,255,255,.6); font-size: 20px; padding: 2px 6px; }

.foot { text-align: center; font-size: 12px; color: var(--muted); padding: 0 16px 28px; }
.foot a { color: var(--brand); }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #F2F2F5; --muted: #9A9AA6; --line: #2C2C34;
    --bg: #131317; --card: #1C1C22;
    --ok-bg: #10301F; --warn-bg: #33280D; --bad-bg: #3A121C;
    --ok: #55C98B; --warn: #E0AC4B; --bad: #FF7A96;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
  .topbar { background: rgba(28,28,34,.9); }
  .muted-card { background: #1A1A20; }
  input[type=text], input[type=email] { background: #24242C; border-color: #33333D; color: var(--ink); }
  .ghost-btn { background: #24242C; border-color: #33333D; }
  .action-btn.out { background: #3A3A46; }
}