:root {
  --bg: #f6f7f5;
  --surface: #ffffff;
  --surface-2: #f0f2ef;
  --border: #e2e5e0;
  --text: #17201c;
  --muted: #64706a;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --danger: #b42318;
  --today: #0f766e;
  --shadow: 0 1px 2px rgba(16, 24, 20, .06), 0 4px 16px rgba(16, 24, 20, .06);

  --k-ice: #0e9384;
  --k-test: #dc6803;
  --k-assignment: #2e6fd8;
  --k-exam: #d92d20;
  --k-session: #7a5af8;
  --k-info: #98a2b3;
  --k-other: #667085;
  --k-class: #4e5ba6;
  --k-resit: #b54708;

  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1412;
    --surface: #161e1b;
    --surface-2: #1d2724;
    --border: #2a3632;
    --text: #e8eeeb;
    --muted: #93a19b;
    --accent: #2dd4bf;
    --accent-ink: #062b27;
    --danger: #f97066;
    --today: #2dd4bf;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
    --k-ice: #2ed3b7;
    --k-test: #fdb022;
    --k-assignment: #6aa1ff;
    --k-exam: #f97066;
    --k-session: #a48afb;
    --k-info: #7d8794;
    --k-other: #98a2b3;
    --k-class: #8098f9;
    --k-resit: #f79009;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1412; --surface: #161e1b; --surface-2: #1d2724; --border: #2a3632;
  --text: #e8eeeb; --muted: #93a19b; --accent: #2dd4bf; --accent-ink: #062b27;
  --danger: #f97066; --today: #2dd4bf;
  --k-ice: #2ed3b7; --k-test: #fdb022; --k-assignment: #6aa1ff; --k-exam: #f97066;
  --k-session: #a48afb; --k-info: #7d8794; --k-other: #98a2b3; --k-class: #8098f9; --k-resit: #f79009;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

h1, h2, h3 { margin: 0 0 .4em; line-height: 1.2; }
h1 { font-size: 1.4rem; }
h2 { font-size: 1.1rem; }
h3 { font-size: .95rem; }
code { font-size: .8em; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; word-break: break-all; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

/* ---------- buttons & inputs ---------- */
.btn {
  appearance: none; border: 1px solid var(--border); background: var(--surface);
  color: var(--text); font: inherit; font-weight: 550; border-radius: 10px;
  padding: .55rem .9rem; cursor: pointer; transition: background .15s, border-color .15s, opacity .15s;
}
.btn:hover { background: var(--surface-2); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn.primary:hover { filter: brightness(1.06); }
.btn.danger { color: var(--danger); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.small { padding: .35rem .65rem; font-size: .85rem; }
.btn.wide { width: 100%; }
.btn.icon { width: 36px; height: 36px; padding: 0; display: inline-grid; place-items: center; font-size: 1.2rem; }
.btn.spinning svg { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

label { display: block; font-size: .85rem; font-weight: 600; margin: .8rem 0; }
input[type=email], input[type=password], input[type=url] {
  display: block; width: 100%; margin-top: .35rem; padding: .65rem .75rem;
  font: inherit; font-weight: 400; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 10px;
}
input:focus-visible, .btn:focus-visible, .chip:focus-visible, .cal-cell:focus-visible, .item:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
.error { color: var(--danger); font-size: .88rem; min-height: 1.2em; margin: .3rem 0 .6rem; }
.hint { color: var(--muted); font-size: .82rem; margin: -.4rem 0 .4rem; }

/* ---------- layout ---------- */
.screen.center { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; width: 100%; }
.auth-card { max-width: 400px; }
.connect-card { max-width: 560px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 750; font-size: 1.1rem; letter-spacing: -.01em; }
.brand img { width: 28px; height: 28px; }
.brand.big { font-size: 1.5rem; margin-bottom: .3rem; }
.brand.big img { width: 36px; height: 36px; }

.tabs { display: flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: 11px; margin: 1rem 0 .4rem; }
.tab { flex: 1; appearance: none; border: 0; background: transparent; color: var(--muted); font: inherit; font-weight: 600; padding: .45rem; border-radius: 8px; cursor: pointer; }
.tab.active { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

.steps { padding-left: 1.2rem; margin: 1rem 0; }
.steps li { margin: .45rem 0; }

.topbar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
}
.topbar-right { display: flex; align-items: center; gap: 6px; }
.sync-status { color: var(--muted); font-size: .8rem; margin-right: 4px; }

.banner { margin: 12px 16px 0; padding: 10px 14px; border-radius: 10px; font-size: .9rem; }
.error-banner { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--danger); }

.filters { display: flex; gap: 6px; padding: 12px 16px 0; overflow-x: auto; scrollbar-width: none; }
.filters::-webkit-scrollbar { display: none; }
.chip {
  appearance: none; flex: none; display: inline-flex; align-items: center; gap: 6px; font: inherit; font-size: .82rem; font-weight: 600;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted); padding: .3rem .7rem; border-radius: 999px; cursor: pointer;
}
.chip .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c); }
.chip.on { color: var(--text); border-color: color-mix(in srgb, var(--c) 55%, var(--border)); background: color-mix(in srgb, var(--c) 10%, var(--surface)); }
.chip:not(.on) .dot { opacity: .35; }

.mobile-tabs { display: none; }

.layout { display: grid; grid-template-columns: minmax(300px, 380px) 1fr; gap: 16px; padding: 16px; max-width: 1280px; margin: 0 auto; align-items: start; }
.pane { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; min-width: 0; }

/* kind colours (classes, not inline styles: the CSP blocks style attributes) */
.k-ice { --c: var(--k-ice); } .k-test { --c: var(--k-test); } .k-assignment { --c: var(--k-assignment); }
.k-exam { --c: var(--k-exam); } .k-class { --c: var(--k-class); } .k-resit { --c: var(--k-resit); } .k-session { --c: var(--k-session); } .k-info { --c: var(--k-info); } .k-other { --c: var(--k-other); }

/* ---------- upcoming list ---------- */
.group { margin-bottom: 18px; }
.group:last-child { margin-bottom: 0; }
.group-title { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 700; margin: 0 0 8px; display: flex; justify-content: space-between; }
.group-title.overdue { color: var(--danger); }
.empty { color: var(--muted); text-align: center; padding: 28px 8px; }

.item {
  display: grid; grid-template-columns: 4px 1fr auto; gap: 10px; align-items: center; width: 100%;
  appearance: none; border: 0; background: transparent; color: inherit; font: inherit; text-align: left;
  padding: 9px 8px; border-radius: 10px; cursor: pointer;
}
.item:hover { background: var(--surface-2); }
.item .bar { align-self: stretch; border-radius: 4px; background: var(--c); }
.item .body { min-width: 0; }
.item .t { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .m { color: var(--muted); font-size: .8rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .when { text-align: right; font-size: .8rem; color: var(--muted); white-space: nowrap; }
.item .when strong { display: block; color: var(--text); font-size: .85rem; }
.item.done .t { text-decoration: line-through; color: var(--muted); }
.item.done .bar { opacity: .35; }
.pill { display: inline-block; font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--c); margin-right: 4px; }

/* ---------- calendar ---------- */
.cal-head { display: flex; align-items: center; gap: 6px; margin-bottom: 12px; }
.cal-head h2 { flex: 1; text-align: center; margin: 0; }
.cal-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 4px; }
.dow { font-size: .72rem; font-weight: 700; color: var(--muted); text-align: center; padding-bottom: 4px; text-transform: uppercase; letter-spacing: .05em; }
.cal-cell {
  appearance: none; border: 1px solid transparent; background: var(--surface-2); color: inherit; font: inherit;
  min-height: 92px; border-radius: 10px; padding: 6px; text-align: left; cursor: pointer; display: flex; flex-direction: column; gap: 3px; min-width: 0;
}
.cal-cell:hover { border-color: var(--border); }
.cal-cell.out { opacity: .4; }
.cal-cell.selected { border-color: var(--accent); }
.cal-cell .num { font-size: .8rem; font-weight: 650; }
.cal-cell.today .num { background: var(--today); color: var(--accent-ink); border-radius: 999px; width: 22px; height: 22px; display: grid; place-items: center; }
.ev { font-size: .7rem; line-height: 1.25; padding: 2px 5px; border-radius: 5px; background: color-mix(in srgb, var(--c) 16%, transparent); color: var(--text); border-left: 3px solid var(--c); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ev.done { opacity: .45; text-decoration: line-through; }
.more { font-size: .68rem; color: var(--muted); padding-left: 3px; }
.dots { display: none; gap: 3px; flex-wrap: wrap; }
.dots i { width: 6px; height: 6px; border-radius: 50%; background: var(--c); }

.day-panel { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 12px; }
.day-panel:empty { display: none; }

/* ---------- dialogs ---------- */
dialog.sheet {
  border: 1px solid var(--border); border-radius: 18px; padding: 0; width: min(520px, calc(100vw - 32px));
  background: var(--surface); color: var(--text); box-shadow: 0 20px 60px rgba(0, 0, 0, .25);
}
dialog.sheet::backdrop { background: rgba(10, 16, 14, .45); backdrop-filter: blur(2px); }
.sheet-body { padding: 20px; }
.sheet-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 6px; }
.sheet-head h2 { margin: 0; }
.detail-kind { display: inline-flex; align-items: center; gap: 6px; font-size: .78rem; font-weight: 700; color: var(--c); text-transform: uppercase; letter-spacing: .05em; }
.detail-kind .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--c); }
.detail-meta { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin: 14px 0; font-size: .92rem; }
.detail-meta dt { color: var(--muted); }
.detail-meta dd { margin: 0; }
.detail-desc { white-space: pre-wrap; background: var(--surface-2); border-radius: 10px; padding: 10px 12px; font-size: .88rem; max-height: 200px; overflow: auto; }
.detail-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.check { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; margin: 0; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.countdown { font-weight: 700; }
.countdown.soon { color: var(--k-test); }
.countdown.late { color: var(--danger); }

.settings-group { border-top: 1px solid var(--border); padding-top: 14px; margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.settings-group h3, .settings-group p { width: 100%; margin: 0; }

.toast {
  position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-size: .9rem; z-index: 50; box-shadow: var(--shadow); max-width: calc(100vw - 32px);
}

/* ---------- mobile ---------- */
@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; padding: 12px 16px 24px; }
  .mobile-tabs { display: flex; gap: 4px; background: var(--surface-2); padding: 4px; border-radius: 11px; margin: 12px 16px 0; }
  .pane { display: none; padding: 12px; }
  .pane.active { display: block; }
  .cal-cell { min-height: 54px; padding: 5px 3px; align-items: center; }
  .cal-cell .ev, .cal-cell .more { display: none; }
  .cal-cell .dots { display: flex; justify-content: center; }
  .sync-status { display: none; }
  .card { padding: 22px 18px; }
}

a { color: var(--accent); }

/* ---------- connect steps ---------- */
.connect-step { display: grid; grid-template-columns: 28px 1fr; gap: 12px; margin: 18px 0; align-items: start; }
.connect-step p { margin: 4px 0 0; }
.connect-step label { margin-top: 2px; }
.connect-step a.btn { display: block; text-align: center; text-decoration: none; }
.step-num { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: .85rem; background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); }
.paste-row { display: flex; gap: 8px; margin-top: .35rem; }
.paste-row input { margin-top: 0; flex: 1; min-width: 0; }
input[type=text] {
  display: block; width: 100%; margin-top: .35rem; padding: .65rem .75rem;
  font: inherit; font-weight: 400; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 10px;
}
.connect-card .brand { margin-bottom: 14px; }

/* ---------- quick done tick ---------- */
.item-row { display: flex; align-items: center; gap: 4px; }
.item-row .item { flex: 1; min-width: 0; }
.tick {
  appearance: none; flex: none; width: 30px; height: 30px; border-radius: 50%; cursor: pointer;
  border: 2px solid var(--border); background: transparent; color: transparent; font-weight: 800; font-size: .8rem;
  display: grid; place-items: center; transition: background .15s, border-color .15s, color .15s;
}
.tick:hover { border-color: var(--c); color: var(--c); }
.tick.on { background: var(--c); border-color: var(--c); color: var(--surface); }
.tick:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- settings extras ---------- */
.bookmark-steps { margin: 4px 0 0; padding-left: 1.2rem; width: 100%; }
.bookmark-steps li { margin: 6px 0; }
.bookmarklet { cursor: grab; text-decoration: none; display: inline-block; }
.admin-list { width: 100%; display: grid; gap: 8px; }
.admin-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; }
.admin-row strong { font-size: .9rem; }
#upload-label { position: relative; }
.group-title.classes { color: var(--k-class); }
.classes-count { color: var(--k-class); }

/* ---------- missing timetable banner ---------- */
.info-banner { background: color-mix(in srgb, var(--accent) 10%, var(--surface)); border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border)); color: var(--text); display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.info-banner #schedule-banner-text { flex: 1 1 260px; }
.banner-actions { display: flex; gap: 6px; flex-wrap: wrap; }
label.btn { display: inline-flex; align-items: center; justify-content: center; margin: 0; font-size: inherit; }
label.btn.small { font-size: .85rem; }
label.btn.wide { display: flex; }

/* ---------- invites ---------- */
.invite-row { display: flex; gap: 8px; width: 100%; }
.invite-row input { flex: 1; min-width: 0; margin-top: 0; }
input[type=text]#invite-note { margin-top: 0; }
.invite-new { width: 100%; display: grid; gap: 6px; padding: 10px 12px; border-radius: 10px; background: color-mix(in srgb, var(--accent) 10%, var(--surface)); }
.invite-new code { font-size: .8rem; }
.invite-new .btn { justify-self: start; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .04em; }

/* ---------- schedule updates ---------- */
.change-banner { background: color-mix(in srgb, var(--k-class) 10%, var(--surface)); border: 1px solid color-mix(in srgb, var(--k-class) 35%, var(--border)); }
.change-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.change-list { margin: 8px 0 0; padding-left: 1.1rem; font-size: .88rem; }
.change-list li { margin: 3px 0; }