:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #4f7cff;
  --primary-ink: #ffffff;
  --red: #e11d48;
  --red-bg: #ffe4e6;
  --amber: #d97706;
  --amber-bg: #fef3c7;
  --green: #059669;
  --green-bg: #d1fae5;
  --blue-bg: #e0e7ff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 14px rgba(15, 23, 42, .05);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120; --card: #131c31; --text: #e2e8f0; --muted: #94a3b8; --border: #23304d;
    --red-bg: #4c0519; --amber-bg: #451a03; --green-bg: #022c22; --blue-bg: #1e1b4b;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.6rem; margin: .2rem 0 .6rem; }
h2 { font-size: 1.1rem; margin: 0 0 .6rem; }
code { background: var(--blue-bg); padding: 0 .3em; border-radius: 4px; }
.container { max-width: 1240px; margin: 0 auto; padding: 1rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.nowrap { white-space: nowrap; }
.text-red { color: var(--red); }
.mt { margin-top: 1rem; }
.prewrap { white-space: pre-wrap; word-break: break-word; }
.empty { color: var(--muted); padding: .5rem 0; }
.inline { display: inline; }
[hidden] { display: none !important; }

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 1rem;
  padding: .6rem 1rem; background: var(--card); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; color: var(--text); white-space: nowrap; }
.nav { display: flex; gap: .2rem; align-items: center; margin-left: auto; flex-wrap: wrap; }
.nav a, .linkish { padding: .4rem .7rem; border-radius: 10px; color: var(--text); }
.nav a.active, .nav a:hover { background: var(--blue-bg); text-decoration: none; }
.linkish { background: none; border: 0; font: inherit; cursor: pointer; color: var(--muted); }
.student .topbar .inline { margin-left: auto; }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--border); border-radius: 8px; font-size: 1.2rem; color: var(--text); }
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; background: var(--card); border-bottom: 1px solid var(--border); padding: .5rem; }
  .nav.open { display: flex; }
}

/* layout */
.page-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem; margin-bottom: .75rem; }
.actions { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 960px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.1rem; margin-bottom: 1rem; box-shadow: var(--shadow); }
.card-head { display: flex; justify-content: space-between; align-items: baseline; }
.narrow { max-width: 760px; }
.notice { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; border-color: var(--primary); }

/* buttons & forms */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .35rem;
  padding: .5rem .9rem; border-radius: 10px; border: 1px solid var(--border); background: var(--card);
  color: var(--text); font: inherit; cursor: pointer; text-decoration: none !important; white-space: nowrap;
}
.btn:hover { border-color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-danger { color: var(--red); border-color: var(--red); }
.btn-ghost { background: transparent; }
.btn-sm { padding: .25rem .55rem; font-size: .85rem; }
.btn-big { padding: .9rem 1.2rem; font-size: 1.1rem; font-weight: 600; }
.btn-block { display: flex; width: 100%; margin: .75rem 0; }
.btn:disabled { opacity: .6; cursor: progress; }
.form { display: grid; gap: .65rem; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .65rem; }
.form-inline { display: flex; gap: .4rem; flex-wrap: wrap; margin: .4rem 0; }
label { display: grid; gap: .25rem; font-weight: 500; font-size: .92rem; }
label.check { display: flex; align-items: center; gap: .45rem; font-weight: 400; }
label.color-field input { width: 64px; height: 36px; padding: 2px; }
input, select, textarea {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 10px; padding: .5rem .65rem; width: 100%;
}
input[type=checkbox] { width: auto; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 0; }
.filters { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.filters select, .filters input { width: auto; }

/* flash */
.flash { padding: .7rem 1rem; border-radius: 10px; margin-bottom: .8rem; background: var(--blue-bg); }
.flash-success { background: var(--green-bg); }
.flash-error { background: var(--red-bg); }

/* badges / chips */
.badge { display: inline-block; font-size: .72rem; font-weight: 600; padding: .1rem .5rem; border-radius: 999px; background: var(--border); color: var(--text); text-transform: uppercase; letter-spacing: .02em; }
.badge-missing { background: var(--red); color: #fff; }
.badge-assigned { background: var(--blue-bg); }
.badge-in_progress { background: var(--amber-bg); color: var(--amber); }
.badge-submitted, .badge-graded { background: var(--green-bg); color: var(--green); }
.badge-excused { background: var(--border); }
.badge-late { background: var(--amber-bg); color: var(--amber); }
.badge-canvas { background: #fee2e2; color: #b91c1c; }
.pill { display: inline-block; min-width: 1.4em; padding: 0 .45em; border-radius: 999px; background: var(--primary); color: #fff; font-size: .78rem; text-align: center; }
.pill-red { background: var(--red); }
.chip { --c: #4f7cff; display: inline-flex; align-items: center; gap: .35rem; padding: .1rem .55rem; border-radius: 999px; font-size: .82rem; font-weight: 600; background: color-mix(in srgb, var(--c) 16%, transparent); color: var(--text); }
.chip::before { content: ""; width: .55rem; height: .55rem; border-radius: 50%; background: var(--c); }
.chip-none { --c: #94a3b8; }
.conf { font-size: .78rem; padding: .05rem .45rem; border-radius: 6px; white-space: nowrap; }
.conf-high { background: var(--green-bg); color: var(--green); }
.conf-mid { background: var(--amber-bg); color: var(--amber); }
.conf-low { background: var(--red-bg); color: var(--red); }

/* rows */
.row { display: flex; align-items: center; gap: .7rem; padding: .55rem .4rem; border-radius: 10px; color: var(--text); border-bottom: 1px solid var(--border); }
a.row:hover { background: var(--bg); text-decoration: none; }
.row:last-child { border-bottom: 0; }
.row-color { --c: #94a3b8; width: 5px; align-self: stretch; border-radius: 4px; background: var(--c); }
.row-main { flex: 1; min-width: 0; display: grid; }
.row-title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-meta { font-size: .82rem; color: var(--muted); }
.row-badges { display: flex; gap: .25rem; flex-wrap: wrap; justify-content: flex-end; }
.row.is-missing .row-title { color: var(--red); }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1rem; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { display: grid; padding: 1rem; border-radius: var(--radius); color: var(--text); background: var(--card); border: 1px solid var(--border); box-shadow: var(--shadow); }
.stat:hover { text-decoration: none; border-color: var(--primary); }
.stat strong { font-size: 2rem; line-height: 1.1; }
.stat span { color: var(--muted); font-size: .85rem; }
.stat-red strong { color: var(--red); }
.stat-amber strong { color: var(--amber); }
.stat-blue strong { color: var(--primary); }
.stat-green strong { color: var(--green); }

/* countdown */
.countdown { background: linear-gradient(135deg, #4f7cff, #8b5cf6); color: #fff; border: 0; }
.countdown .eyebrow { opacity: .9; }
.countdown-digits { display: flex; gap: 1.2rem; margin: .4rem 0 .6rem; }
.countdown-digits div { display: grid; text-align: center; }
.countdown-digits strong { font-size: 2.4rem; line-height: 1; font-variant-numeric: tabular-nums; }
.countdown-digits span { font-size: .75rem; text-transform: uppercase; opacity: .85; }
.countdown.compact .countdown-digits strong { font-size: 1.8rem; }
.countdown .muted { color: rgba(255, 255, 255, .85); }
.progress { height: 8px; border-radius: 999px; background: rgba(255, 255, 255, .25); overflow: hidden; margin-bottom: .3rem; }
.progress div { height: 100%; background: #fff; border-radius: 999px; }
.eyebrow { font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }

/* class cards */
.class-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .8rem; }
.class-card { --c: #4f7cff; display: grid; gap: .25rem; padding: .8rem; border-radius: 12px; color: var(--text); border: 1px solid var(--border); border-top: 5px solid var(--c); }
.class-card:hover { text-decoration: none; background: var(--bg); }
.class-card-title { font-weight: 700; }
.class-card-stats { display: flex; gap: .8rem; font-size: .85rem; }

/* tables */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.table th { font-size: .78rem; text-transform: uppercase; color: var(--muted); }
.table tr.highlight td { background: var(--blue-bg); }
@media (max-width: 720px) { .table { display: block; overflow-x: auto; } }

/* calendar */
.month-nav { display: flex; gap: .5rem; align-items: center; }
.month-nav h1 { margin: 0 .4rem; min-width: 11ch; text-align: center; }
.calendar { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.cal-dow { background: var(--card); padding: .4rem; font-size: .78rem; text-transform: uppercase; color: var(--muted); text-align: center; font-weight: 600; }
.cal-day { background: var(--card); min-height: 118px; padding: .3rem; display: flex; flex-direction: column; gap: 3px; }
.cal-day.other-month { background: var(--bg); opacity: .65; }
.cal-day.today { box-shadow: inset 0 0 0 2px var(--primary); }
.cal-day.term-end { background: color-mix(in srgb, #8b5cf6 12%, var(--card)); }
.cal-day-head { display: flex; justify-content: space-between; }
.cal-num { font-weight: 700; font-size: .85rem; }
.cal-add { opacity: 0; font-size: .85rem; }
.cal-day:hover .cal-add { opacity: 1; }
.cal-flag { font-size: .72rem; font-weight: 700; color: #8b5cf6; }
.cal-event { --c: #94a3b8; display: block; font-size: .75rem; padding: 2px 5px; border-radius: 5px; color: var(--text); background: color-mix(in srgb, var(--c) 18%, transparent); border-left: 3px solid var(--c); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cal-event:hover { text-decoration: none; filter: brightness(.95); }
.cal-event.is-missing { background: var(--red-bg); border-left-color: var(--red); font-weight: 600; }
.cal-event.is-done { opacity: .6; text-decoration: line-through; }
.legend { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .75rem; align-items: center; }
@media (max-width: 720px) {
  .cal-day { min-height: 70px; }
  .cal-event { font-size: 0; padding: 0; height: 6px; border-left-width: 0; background: var(--c); }
  .cal-event.is-missing { background: var(--red); }
}

/* agenda */
.agenda-day h2 { display: flex; gap: .5rem; align-items: baseline; }
.agenda-day.is-today { border-color: var(--primary); }
.agenda-day.overdue { border-color: var(--red); }
.pager { display: flex; justify-content: space-between; }

/* ticket */
.ticket-head { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.ticket-meta { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; font-size: .9rem; }
.ticket-actions { display: grid; gap: .5rem; align-content: start; }
.status-buttons { display: flex; flex-wrap: wrap; gap: .3rem; }
.ticket-grid { grid-template-columns: 3fr 2fr; }
@media (max-width: 960px) { .ticket-grid { grid-template-columns: 1fr; } }
.timeline { list-style: none; margin: 0; padding: 0 0 0 1rem; border-left: 2px solid var(--border); }
.tl { position: relative; padding: .2rem 0 1rem .8rem; }
.tl::before { content: ""; position: absolute; left: -1.43rem; top: .45rem; width: .8rem; height: .8rem; border-radius: 50%; background: var(--primary); border: 2px solid var(--card); }
.tl-note::before { background: var(--amber); }
.tl-missing::before { background: var(--red); }
.tl-resolved::before { background: var(--green); }
.tl-head { display: flex; flex-wrap: wrap; gap: .5rem; align-items: baseline; }
.tl-body { margin: .3rem 0; padding: .5rem .7rem; background: var(--bg); border-radius: 8px; }
.note { padding: .5rem .7rem; border-radius: 10px; background: var(--amber-bg); }
.note + .note { margin-top: .5rem; }
.note-shared { box-shadow: inset 3px 0 0 var(--green); }
.pinned { border-color: var(--amber); }
.scan { max-height: 260px; overflow: auto; font-size: .8rem; background: var(--bg); padding: .5rem; border-radius: 8px; }
details summary { cursor: pointer; color: var(--muted); margin: .3rem 0; }
.attachments { display: flex; flex-wrap: wrap; gap: .5rem; margin: .4rem 0; }
.thumb img { width: 110px; height: 110px; object-fit: cover; border-radius: 10px; border: 1px solid var(--border); }
.file { display: inline-flex; gap: .4rem; align-items: center; padding: .4rem .6rem; border: 1px solid var(--border); border-radius: 10px; color: var(--text); }

/* inbox */
.inbox-grid { display: grid; grid-template-columns: 3fr 2fr; gap: 1rem; }
@media (max-width: 860px) { .inbox-grid { grid-template-columns: 1fr; } }
.test-result { margin-top: .8rem; padding: .7rem; border-radius: 10px; background: var(--green-bg); }
.test-result.warn { background: var(--amber-bg); }
.sync-strip { display: grid; gap: .2rem; }

/* login */
.login-page .container { display: grid; place-items: center; min-height: 90vh; }
.login-card { width: min(420px, 100%); }

/* student */
.student .container { max-width: 640px; padding-bottom: 6rem; }
.greeting { font-size: 1.5rem; }
.alert-card { border-color: var(--red); }
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; display: grid; grid-template-columns: 1fr 1fr 1fr;
  background: var(--card); border-top: 1px solid var(--border); padding: .3rem .5rem calc(.3rem + env(safe-area-inset-bottom));
}
.bottom-nav a { display: grid; justify-items: center; font-size: .78rem; color: var(--muted); padding: .2rem; }
.bottom-nav a span { font-size: 1.3rem; }
.bottom-nav a.active { color: var(--primary); }
.bottom-nav .submit-btn span { background: var(--primary); color: #fff; width: 2.6rem; height: 2.6rem; border-radius: 50%; display: grid; place-items: center; margin-top: -1.2rem; box-shadow: var(--shadow); }
.file-picks { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.pick { display: flex; }
.file-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .4rem; }
.file-list li { display: flex; align-items: center; gap: .6rem; padding: .3rem; border: 1px solid var(--border); border-radius: 10px; }
.file-list img { width: 52px; height: 52px; object-fit: cover; border-radius: 8px; }
.file-list .file-icon { font-size: 1.8rem; width: 52px; text-align: center; }
.file-list .file-name { flex: 1; font-size: .85rem; word-break: break-all; }