:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #f0f2f7;
  --border: #e3e6ee;
  --text: #171a26;
  --muted: #646b80;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --accent-text: #ffffff;
  --danger: #dc2626;
  --ok: #16a34a;
  --warn: #b45309;
  --warn-soft: #fff7e6;
  --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 4px 16px rgb(16 24 40 / 6%);
  --radius: 14px;

  --t-schularbeit: #dc2626;
  --t-test: #ea580c;
  --t-wiederholung: #ca8a04;
  --t-wiederholung_vermutet: #94a3b8;
  --t-praesentation: #2563eb;
  --t-hausuebung: #16a34a;
  --t-sonstiges: #7c3aed;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --surface: #181b24;
    --surface-2: #20242f;
    --border: #2b303d;
    --text: #e8eaf1;
    --muted: #9aa1b5;
    --accent: #818cf8;
    --accent-soft: #23264a;
    --accent-text: #0f1117;
    --warn: #fbbf24;
    --warn-soft: #2d2412;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 6px 20px rgb(0 0 0 / 25%);
    --t-wiederholung_vermutet: #64748b;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); }
h1, h2, h3 { margin: 0; line-height: 1.2; }
h1 { font-size: 1.6rem; letter-spacing: -0.02em; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.boot { display: grid; place-items: center; min-height: 100vh; color: var(--muted); }
[hidden] { display: none !important; }

/* ------------------------------ Layout ------------------------------ */
.shell { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh;
  background: var(--surface); border-right: 1px solid var(--border);
  padding: 20px 14px; display: flex; flex-direction: column; gap: 4px;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 18px; font-weight: 700; }
.brand img { width: 32px; height: 32px; }
.brand small { display: block; font-weight: 500; color: var(--muted); }
.nav a {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px;
  color: var(--text); text-decoration: none; font-weight: 500;
}
.nav a:hover { background: var(--surface-2); }
.nav a.active { background: var(--accent-soft); color: var(--accent); }
.nav svg { width: 20px; height: 20px; flex: none; }
.sidebar .spacer { flex: 1; }
.main { padding: 28px 32px 60px; max-width: 1180px; width: 100%; }
.page-head { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head .grow { flex: 1; min-width: 200px; }

.tabbar { display: none; }

@media (max-width: 899px) {
  .shell { display: block; }
  .sidebar { display: none; }
  .main { padding: 18px 16px 100px; }
  .tabbar {
    display: grid; grid-template-columns: repeat(5, 1fr);
    position: fixed; inset: auto 0 0 0; z-index: 20;
    background: var(--surface); border-top: 1px solid var(--border);
    padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  }
  .tabbar a {
    display: flex; flex-direction: column; align-items: center; gap: 2px;
    font-size: 0.7rem; color: var(--muted); text-decoration: none; padding: 4px 0;
  }
  .tabbar a.active { color: var(--accent); }
  .tabbar svg { width: 22px; height: 22px; }
  h1 { font-size: 1.35rem; }
  .fab {
    position: fixed; right: 16px; bottom: calc(76px + env(safe-area-inset-bottom)); z-index: 21;
    width: 56px; height: 56px; border-radius: 18px; padding: 0; justify-content: center;
    box-shadow: 0 8px 24px rgb(79 70 229 / 35%);
  }
  .fab span { display: none; }
}

/* ------------------------------ Controls ------------------------------ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 9px 14px; border-radius: 10px; cursor: pointer; font-weight: 600; white-space: nowrap;
  min-height: 40px;
}
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--danger); }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--surface-2); }
.btn.sm { padding: 5px 10px; min-height: 32px; font-size: 0.85rem; }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn svg { width: 18px; height: 18px; }
.icon-btn { border: 0; background: transparent; padding: 8px; border-radius: 10px; cursor: pointer; display: inline-grid; place-items: center; color: var(--muted); }
.icon-btn:hover { background: var(--surface-2); color: var(--text); }
.icon-btn svg { width: 20px; height: 20px; }

label.field { display: grid; gap: 6px; font-weight: 600; font-size: 0.88rem; }
label.field > span.hint { font-weight: 400; color: var(--muted); }
input[type=text], input[type=password], input[type=date], input[type=time], input[type=search], select, textarea {
  width: 100%; border: 1px solid var(--border); background: var(--surface); border-radius: 10px;
  padding: 9px 11px; min-height: 40px; font-weight: 400;
}
textarea { min-height: 90px; resize: vertical; }
input:focus, select:focus, textarea:focus, .btn:focus-visible, .chip:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
@media (max-width: 560px) { .form-grid { grid-template-columns: 1fr; } }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: var(--surface); border-radius: 999px;
  padding: 6px 12px; cursor: pointer; font-size: 0.85rem; font-weight: 600; display: inline-flex; align-items: center; gap: 6px;
}
.chip .dot { width: 8px; height: 8px; border-radius: 50%; }
.chip.on { background: var(--text); color: var(--bg); border-color: var(--text); }
.toggle { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-size: 0.88rem; font-weight: 500; }
.toggle input { width: 18px; height: 18px; accent-color: var(--accent); }

.segmented { display: flex; flex-wrap: wrap; gap: 6px; }
.segmented button {
  border: 1px solid var(--border); background: var(--surface); padding: 8px 12px; border-radius: 10px;
  cursor: pointer; font-weight: 600; font-size: 0.85rem; display: inline-flex; align-items: center; gap: 6px;
}
.segmented button.on { border-color: var(--c, var(--accent)); background: color-mix(in srgb, var(--c, var(--accent)) 12%, var(--surface)); color: var(--c, var(--accent)); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.card.pad { padding: 18px; }
.section { margin-top: 26px; }
.section > h2 { margin-bottom: 12px; }
.empty { padding: 34px 18px; text-align: center; color: var(--muted); }

/* ------------------------------ Badges ------------------------------ */
.badge {
  display: inline-flex; align-items: center; gap: 5px; border-radius: 999px; padding: 2px 9px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.01em;
  background: color-mix(in srgb, var(--c) 14%, transparent); color: var(--c);
}
.badge.solid { background: var(--c); color: #fff; }
.subj { font-weight: 700; color: var(--c); }
.mine-tag { background: #f59e0b; color: #1f1300; border-radius: 6px; padding: 1px 7px; font-size: 0.72rem; font-weight: 800; }

/* ------------------------------ Hero ------------------------------ */
.hero {
  position: relative; overflow: hidden; border-radius: 20px; padding: 24px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--c) 92%, #000) 0%, color-mix(in srgb, var(--c) 70%, #1e1b4b) 100%);
  color: #fff; box-shadow: 0 10px 30px color-mix(in srgb, var(--c) 30%, transparent);
  cursor: pointer;
}
.hero::after {
  content: ""; position: absolute; right: -60px; top: -60px; width: 220px; height: 220px; border-radius: 50%;
  background: rgb(255 255 255 / 9%);
}
.hero .eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; font-weight: 800; opacity: 0.85; }
.hero .title { font-size: 1.7rem; font-weight: 800; margin: 6px 0 2px; letter-spacing: -0.02em; }
.hero .subtitle { opacity: 0.92; font-weight: 500; }
.hero .meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 16px; font-weight: 600; }
.hero .meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero .meta svg { width: 18px; height: 18px; opacity: 0.85; }
.hero .countdown {
  position: absolute; right: 24px; top: 24px; text-align: right; z-index: 1;
}
.hero .countdown b { display: block; font-size: 2.2rem; line-height: 1; font-weight: 800; }
.hero .countdown small { opacity: 0.85; font-weight: 600; }
.hero .badge { background: rgb(255 255 255 / 20%); color: #fff; }
.hero .desc { margin-top: 10px; opacity: 0.9; max-width: 60ch; white-space: pre-line; }
@media (max-width: 560px) {
  .hero { padding: 20px; }
  .hero .title { font-size: 1.35rem; padding-right: 0; }
  .hero .countdown { position: static; text-align: left; margin-bottom: 10px; }
  .hero .countdown b { display: inline; font-size: 1.5rem; margin-right: 6px; }
}
.hero.empty-hero { background: var(--surface); color: var(--muted); box-shadow: none; border: 1px dashed var(--border); cursor: default; text-align: center; }
.hero.empty-hero::after { display: none; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-top: 16px; }
.stat { padding: 14px 16px; }
.stat b { font-size: 1.5rem; display: block; }
.stat span { color: var(--muted); font-size: 0.85rem; font-weight: 600; }

/* ------------------------------ Event list ------------------------------ */
.filters { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin: 22px 0 6px; }
.filters select { width: auto; min-width: 160px; }
.day-group { margin-top: 20px; }
.day-head { display: flex; align-items: baseline; gap: 10px; margin: 0 4px 8px; }
.day-head h3 { font-size: 0.95rem; }
.day-head .rel { font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.day-head.today h3 { color: var(--accent); }
.ev-list { display: grid; gap: 8px; }
.ev {
  display: grid; grid-template-columns: 4px 1fr auto; gap: 14px; align-items: center;
  padding: 12px 14px 12px 12px; cursor: pointer; transition: transform 0.08s ease;
}
.ev:hover { transform: translateY(-1px); }
.ev .bar { align-self: stretch; border-radius: 4px; background: var(--c); }
.ev .body { min-width: 0; }
.ev .line1 { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; }
.ev .ttl { font-weight: 650; }
.ev .line2 { color: var(--muted); font-size: 0.85rem; margin-top: 3px; display: flex; flex-wrap: wrap; gap: 4px 12px; }
.ev .actions { display: flex; align-items: center; gap: 6px; }
.ev.done .ttl { text-decoration: line-through; color: var(--muted); }
.ev.done { opacity: 0.7; }
.ev.suspected { border-style: dashed; }
.ev.mine { box-shadow: 0 0 0 2px #f59e0b, var(--shadow); }
.ev .pres-list { margin: 6px 0 0; padding: 0; list-style: none; display: grid; gap: 3px; font-size: 0.88rem; }
.ev .pres-list li { display: flex; gap: 8px; align-items: baseline; }
.ev .pres-list .who { font-weight: 600; white-space: nowrap; }
.ev .pres-list .what { color: var(--muted); overflow: hidden; text-overflow: ellipsis; }
.check {
  width: 28px; height: 28px; border-radius: 8px; border: 2px solid var(--border); background: var(--surface);
  display: grid; place-items: center; cursor: pointer; padding: 0;
}
.check.on { background: var(--ok); border-color: var(--ok); color: #fff; }
.check svg { width: 16px; height: 16px; }
.vote { font-size: 0.8rem; }
.vote.on { border-color: var(--t-wiederholung); color: var(--t-wiederholung); }

/* ------------------------------ Calendar ------------------------------ */
.cal-head { display: flex; align-items: center; gap: 8px; }
.cal { display: grid; grid-template-columns: repeat(7, 1fr); gap: 1px; background: var(--border); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.cal .dow { background: var(--surface-2); padding: 8px; font-size: 0.78rem; font-weight: 700; color: var(--muted); text-align: center; }
.cal .day { background: var(--surface); min-height: 108px; padding: 6px; cursor: pointer; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.cal .day:hover { background: var(--surface-2); }
.cal .day.other { background: color-mix(in srgb, var(--surface-2) 60%, var(--surface)); color: var(--muted); }
.cal .day.weekend { background: color-mix(in srgb, var(--surface-2) 40%, var(--surface)); }
.cal .num { font-size: 0.8rem; font-weight: 700; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; }
.cal .day.today .num { background: var(--accent); color: var(--accent-text); }
.cal .pill {
  font-size: 0.72rem; font-weight: 650; border-radius: 5px; padding: 1px 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  background: color-mix(in srgb, var(--c) 15%, transparent); color: var(--c); border-left: 3px solid var(--c);
}
.cal .pill.dashed { border-left-style: dashed; }
.cal .more { font-size: 0.72rem; color: var(--muted); font-weight: 600; }
@media (max-width: 700px) {
  .cal .day { min-height: 64px; padding: 4px; }
  .cal .pill { font-size: 0; padding: 0; height: 6px; border-left: 0; background: var(--c); border-radius: 3px; }
  .cal .more { font-size: 0.65rem; }
}

/* ------------------------------ Week / Timetable ------------------------------ */
.week-wrap { overflow-x: auto; }
.week { display: grid; grid-template-columns: 64px repeat(5, minmax(130px, 1fr)); gap: 4px; min-width: 720px; }
.week .h { font-weight: 700; font-size: 0.85rem; text-align: center; padding: 6px; color: var(--muted); }
.week .h.today { color: var(--accent); }
.week .p { font-size: 0.72rem; color: var(--muted); text-align: right; padding: 4px 6px; line-height: 1.25; }
.week .p b { display: block; font-size: 0.9rem; color: var(--text); }
.week .cell { border-radius: 10px; min-height: 56px; }
.week .lesson {
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--c);
  padding: 6px 8px; font-size: 0.8rem; display: flex; flex-direction: column; gap: 3px; cursor: pointer;
}
.week .lesson .alt { display: flex; gap: 6px; flex-wrap: wrap; }
.week .lesson .tch { color: var(--muted); font-size: 0.72rem; }
.week .lesson .evs { display: flex; flex-direction: column; gap: 3px; margin-top: 2px; }
.week .lesson .evs .badge { justify-content: flex-start; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.week .lesson.has-ev { box-shadow: 0 0 0 1px var(--c); }
.week .free { background: repeating-linear-gradient(45deg, transparent 0 8px, color-mix(in srgb, var(--border) 50%, transparent) 8px 9px); }

/* ------------------------------ Table ------------------------------ */
.table-wrap { overflow-x: auto; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.tbl th { text-align: left; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); padding: 10px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.tbl td { padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tr.mine td { background: color-mix(in srgb, #f59e0b 12%, transparent); }
.tbl tr.past td { color: var(--muted); }
.tbl tr.excluded td { opacity: 0.5; }
.tbl input, .tbl select { min-height: 34px; padding: 5px 8px; font-size: 0.88rem; }
.tbl select { min-width: 130px; }
.tbl input[type=text] { min-width: 140px; }
.warn { color: var(--warn); font-size: 0.78rem; margin-top: 4px; }
.notice { background: var(--warn-soft); color: var(--warn); border-radius: 10px; padding: 10px 14px; font-size: 0.88rem; font-weight: 500; }
.notice.info { background: var(--accent-soft); color: var(--accent); }

/* ------------------------------ Dropzone ------------------------------ */
.drop {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 28px; text-align: center; cursor: pointer;
  background: var(--surface); transition: border-color 0.15s, background 0.15s;
}
.drop.over, .drop:hover { border-color: var(--accent); background: var(--accent-soft); }
.drop svg { width: 34px; height: 34px; color: var(--accent); }
.drop b { display: block; margin-top: 8px; }
.ai-status { display: inline-flex; align-items: center; gap: 8px; font-size: 0.85rem; font-weight: 600; }
.ai-status .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.ai-status.on .dot { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent); }
.ai-status.off .dot { background: var(--warn); }
.spinner { width: 18px; height: 18px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin 0.8s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ------------------------------ Modal ------------------------------ */
.modal-back {
  position: fixed; inset: 0; background: rgb(10 12 20 / 45%); z-index: 50;
  display: grid; place-items: center; padding: 16px; animation: fade 0.12s ease;
}
.modal {
  background: var(--surface); border-radius: 18px; width: min(620px, 100%); max-height: calc(100vh - 32px); overflow: auto;
  box-shadow: 0 20px 60px rgb(0 0 0 / 30%); animation: pop 0.14s ease;
}
.modal .m-head { display: flex; align-items: center; gap: 10px; padding: 18px 20px 6px; }
.modal .m-head h2 { flex: 1; }
.modal .m-body { padding: 10px 20px 20px; display: grid; gap: 14px; }
.modal .m-foot { display: flex; gap: 10px; justify-content: flex-end; padding: 14px 20px; border-top: 1px solid var(--border); position: sticky; bottom: 0; background: var(--surface); }
.modal .m-foot .left { margin-right: auto; }
@media (max-width: 560px) {
  .modal-back { place-items: end stretch; padding: 0; }
  .modal { border-radius: 18px 18px 0 0; max-height: 92vh; width: 100%; }
}
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { transform: translateY(8px); opacity: 0; } }
.kv { display: grid; grid-template-columns: 120px 1fr; gap: 8px 12px; font-size: 0.92rem; }
.kv dt { color: var(--muted); font-weight: 600; }
.kv dd { margin: 0; white-space: pre-line; }

#toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px); z-index: 100;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-weight: 600;
  opacity: 0; pointer-events: none; transition: all 0.2s ease; max-width: calc(100vw - 32px);
}
#toast.show { opacity: 1; transform: translateX(-50%); }
#toast.error { background: var(--danger); color: #fff; }
@media (max-width: 899px) { #toast { bottom: calc(90px + env(safe-area-inset-bottom)); } }

/* ------------------------------ Auth ------------------------------ */
.auth { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.auth .card { width: min(420px, 100%); padding: 28px; display: grid; gap: 16px; }
.auth .brand { justify-content: center; padding: 0 0 4px; font-size: 1.2rem; }
.auth .brand img { width: 44px; height: 44px; }
.auth .switch { text-align: center; font-size: 0.9rem; }
.auth .switch button { border: 0; background: none; color: var(--accent); font-weight: 600; cursor: pointer; }
.error-text { color: var(--danger); font-size: 0.88rem; font-weight: 500; }

.list-rows { display: grid; }
.list-rows .row { display: flex; align-items: center; gap: 10px; padding: 10px 4px; border-bottom: 1px solid var(--border); }
.list-rows .row:last-child { border-bottom: 0; }
.list-rows .row .grow { flex: 1; min-width: 0; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 18px; }
.swatch { width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border); padding: 0; cursor: pointer; }
.chip-count { font-size: 0.72rem; font-weight: 700; opacity: 0.6; margin-left: 2px; }
.src-tag { font-size: 0.7rem; font-weight: 700; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 0 6px; }
.removed-tag { font-size: 0.72rem; font-weight: 700; color: var(--warn); background: var(--warn-soft); border-radius: 6px; padding: 1px 7px; }
.ev.removed .ttl { text-decoration: line-through; color: var(--muted); }
.ev.removed { opacity: 0.75; }