/* =====================================================================
 * styles.css – Excel WENN-Trainer
 * Desktop-Layout (ab ca. 1200 px Breite), ruhige Farben,
 * Grün = richtig, Rot = falsch.
 * ===================================================================== */

/* ---------- Design-Variablen ---------- */
:root {
  --bg: #f4f6fa;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e2e7ef;
  --border-strong: #cfd6e2;
  --text: #1b2330;
  --text-2: #3c4757;
  --muted: #677386;

  --primary: #1f4fd1;
  --primary-hover: #1a43b3;
  --primary-weak: #e9effd;

  --ok: #15803d;
  --ok-bg: #e9f7ef;
  --ok-border: #a7dcbb;
  --err: #c62828;
  --err-bg: #fdeeee;
  --err-border: #f1b2b2;
  --warn: #a15c07;
  --warn-bg: #fff6e6;
  --warn-border: #f4d39b;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .06);
  --shadow-lg: 0 10px 30px rgba(16, 24, 40, .12);

  --font: "Segoe UI", "Inter", system-ui, -apple-system, Roboto, Arial, sans-serif;
  --mono: "Cascadia Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --sidebar: 256px;
}

* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  min-width: 1180px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; color: var(--text); }
h1 { font-size: 1.75rem; font-weight: 700; }
h2 { font-size: 1.2rem; font-weight: 650; }
h3 { font-size: 1.05rem; font-weight: 650; }
p { margin: 0 0 .8em; }
code, kbd { font-family: var(--mono); }
code { font-size: .92em; background: var(--surface-2); border: 1px solid var(--border); border-radius: 5px; padding: .05em .35em; }
kbd {
  display: inline-block; min-width: 1.6em; padding: .1em .45em; font-size: .85em; text-align: center;
  background: #fff; border: 1px solid var(--border-strong); border-bottom-width: 2px; border-radius: 5px; color: var(--text);
}
.ic { flex-shrink: 0; vertical-align: middle; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.mt { margin-top: 1.4rem; }
.ok-text { color: var(--ok); font-weight: 600; }
.err-text { color: var(--err); font-weight: 600; }
:focus-visible { outline: 3px solid rgba(31, 79, 209, .35); outline-offset: 2px; }

/* ---------- Grundlayout ---------- */
.app { display: flex; min-height: 100vh; }
.sidebar {
  position: fixed; inset: 0 auto 0 0; width: var(--sidebar);
  background: #101828; color: #cbd5e1; display: flex; flex-direction: column; padding: 20px 14px;
}
.brand { display: flex; gap: 12px; align-items: center; padding: 4px 8px 22px; color: #fff; text-decoration: none !important; }
.brand-logo {
  width: 42px; height: 42px; border-radius: 10px; background: var(--primary); color: #fff;
  display: grid; place-items: center; font-weight: 700; font-style: italic; font-size: 1.25rem; font-family: Georgia, serif;
}
.brand-title { font-weight: 700; font-size: 1.05rem; }
.brand-sub { font-size: .78rem; color: #94a3b8; }
#nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.nav-link {
  display: flex; align-items: center; gap: 12px; padding: 9px 12px; border-radius: 8px;
  color: #cbd5e1; font-weight: 500; text-decoration: none !important; transition: background .15s, color .15s;
}
.nav-link:hover { background: rgba(255, 255, 255, .06); color: #fff; }
.nav-link.active { background: var(--primary); color: #fff; }
.nav-sep { margin: 16px 12px 6px; font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: #64748b; }
.sync-status { display: flex; gap: 8px; align-items: center; font-size: .8rem; padding: 10px 12px; border-radius: 8px; background: rgba(255, 255, 255, .05); }
.sync-ok { color: #86efac; }
.sync-warn, .sync-err { color: #fcd34d; }
.sync-busy { color: #93c5fd; }

.main-wrap { margin-left: var(--sidebar); flex: 1; min-width: 0; }
.topbar {
  position: sticky; top: 0; z-index: 5; height: 64px; display: flex; align-items: center; justify-content: space-between;
  padding: 0 36px; background: rgba(244, 246, 250, .92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--border);
}
.page-title { font-weight: 600; color: var(--text-2); }
.top-stats { display: flex; align-items: center; gap: 18px; }
.top-stat { display: flex; align-items: center; gap: 6px; color: var(--text-2); font-size: .92rem; }
.top-stat b { font-size: 1.05rem; color: var(--text); }
.top-stat .ic { color: #e07a12; }
.top-stat:nth-child(2) .ic { color: #d4a106; }
.top-stat.level { background: var(--primary-weak); color: var(--primary); font-weight: 600; padding: 4px 12px; border-radius: 999px; font-size: .85rem; }
.top-user { font-weight: 600; padding-left: 18px; border-left: 1px solid var(--border-strong); }

main { max-width: 1160px; margin: 0 auto; padding: 28px 36px 64px; outline: none; }

/* ---------- Karten & Grids ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px 28px; margin-bottom: 20px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.card-head h2 { margin: 0; }
.card-sub { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-2 > .card { margin-bottom: 20px; }
.page-head { margin-bottom: 20px; }
.page-head p { color: var(--text-2); max-width: 820px; }
.page-head.row { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; }
.crumbs { font-size: .9rem; color: var(--muted); margin-bottom: 14px; }
.empty { text-align: center; padding: 48px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; border-radius: 9px;
  border: 1px solid var(--primary); background: var(--primary); color: #fff; font: inherit; font-weight: 600; font-size: .95rem;
  cursor: pointer; text-decoration: none !important; transition: background .15s, border-color .15s, box-shadow .15s; white-space: nowrap;
}
.btn:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn:disabled, .btn-disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--muted); }
.btn-ok { background: var(--ok); border-color: var(--ok); }
.btn-ok:hover { background: #126b33; border-color: #126b33; }
.btn-danger { background: #fff; color: var(--err); border-color: var(--err-border); }
.btn-danger:hover { background: var(--err-bg); }
.btn-small { padding: 6px 12px; font-size: .85rem; border-radius: 7px; }
.btn-big { padding: 13px 24px; font-size: 1.02rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
.page-head .btn-row { margin-top: 0; }
.file-btn { position: relative; }

.seg { display: inline-flex; border: 1px solid var(--border-strong); border-radius: 9px; overflow: hidden; background: #fff; }
.seg button { border: 0; background: transparent; padding: 9px 16px; font: inherit; font-weight: 600; color: var(--text-2); cursor: pointer; }
.seg button.active { background: var(--primary-weak); color: var(--primary); }

.chip { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px; font-size: .78rem; font-weight: 600; background: var(--primary-weak); color: var(--primary); }
.chip.ok { background: var(--ok-bg); color: var(--ok); }
.chip.warn { background: var(--warn-bg); color: var(--warn); }
.chip.bad { background: var(--err-bg); color: var(--err); }

/* ---------- Formulare ---------- */
input, select, textarea { font: inherit; color: var(--text); }
input[type="text"], input:not([type]), input[type="password"], select {
  border: 1px solid var(--border-strong); border-radius: 8px; padding: 9px 12px; background: #fff; min-width: 0;
}
input:focus, select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(31, 79, 209, .15); }
.inline-form { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.inline-form label { font-weight: 600; color: var(--text-2); }
.inline-form input { width: 280px; }
.stack-form { display: flex; flex-direction: column; gap: 8px; max-width: 360px; margin: 0 auto; text-align: left; }
.stack-form label { font-weight: 600; margin-top: 6px; }
.stack-form .btn { margin-top: 8px; }

/* ---------- Fortschrittsbalken & Ring ---------- */
.bar { height: 8px; background: #e7ebf2; border-radius: 999px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--primary); border-radius: 999px; transition: width .5s ease; }
.bar.ok .bar-fill { background: var(--ok); }
.bar.warm .bar-fill { background: #e07a12; }
.ring {
  --p: 0; width: 132px; height: 132px; border-radius: 50%; flex-shrink: 0;
  background: conic-gradient(var(--primary) calc(var(--p) * 1%), #e7ebf2 0);
  display: grid; place-items: center;
}
.ring.ok { background: conic-gradient(var(--ok) calc(var(--p) * 1%), #e7ebf2 0); }
.ring.bad { background: conic-gradient(var(--err) calc(var(--p) * 1%), #e7ebf2 0); }
.ring.big { width: 160px; height: 160px; }
.ring-inner { width: 76%; height: 76%; border-radius: 50%; background: #fff; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring-inner b { font-size: 1.6rem; line-height: 1.1; }
.ring.big .ring-inner b { font-size: 2rem; }
.ring-inner span { font-size: .8rem; color: var(--muted); }

/* ---------- Dashboard ---------- */
.hero { display: flex; justify-content: space-between; align-items: center; gap: 32px; padding: 28px 32px; background: linear-gradient(135deg, #fff 60%, var(--primary-weak)); }
.hero h1 { font-size: 1.9rem; }
.hero p { color: var(--text-2); font-size: 1.05rem; margin: 0; }
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.kpis.small { grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 16px 0; }
.kpi {
  display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto; gap: 10px 14px; align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
  color: var(--text); text-decoration: none !important; transition: border-color .15s, transform .15s;
}
a.kpi:hover { border-color: var(--primary); transform: translateY(-1px); }
.kpi .bar { grid-column: 1 / -1; }
.kpi b { display: block; font-size: 1.4rem; line-height: 1.2; }
.kpi span { display: block; font-size: .82rem; color: var(--muted); }
.kpis.small .kpi { grid-template-columns: 1fr; padding: 12px 16px; box-shadow: none; }
.kpis.small .kpi b { font-size: 1.15rem; }
.kpi-icon { width: 42px; height: 42px; border-radius: 10px; background: var(--primary-weak); color: var(--primary); display: grid; place-items: center; }
.kpi-icon.flame { background: #fff1e3; color: #e07a12; }

.topic-progress { display: flex; flex-direction: column; gap: 14px; }
.tp-row { display: block; color: var(--text); text-decoration: none !important; padding: 6px 8px; margin: -6px -8px; border-radius: 8px; }
.tp-row:hover { background: var(--surface-2); }
.tp-head { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: .95rem; }
.tp-title { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.tp-num { color: var(--muted); font-size: .85rem; }
.dot { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--border-strong); display: inline-grid; place-items: center; }
.dot.ok { background: var(--ok); border-color: var(--ok); color: #fff; }
.next-step { background: var(--primary-weak); border-radius: var(--radius-sm); padding: 18px 20px; }
.next-step h3 { margin-bottom: 4px; }
.next-step p { color: var(--text-2); }
.next-step .btn { margin-top: 4px; }
.activity { display: grid; grid-template-columns: repeat(21, 1fr); gap: 5px; }
.day { aspect-ratio: 1; border-radius: 4px; background: #e7ebf2; }
.day.on { background: var(--ok); }
.day.today { outline: 2px solid var(--primary); outline-offset: 1px; }
.activity-legend { display: flex; justify-content: space-between; font-size: .75rem; color: var(--muted); margin-top: 4px; }
.mini-list { list-style: none; margin: 0; padding: 0; }
.mini-list li { display: flex; justify-content: space-between; padding: 7px 0; border-bottom: 1px solid var(--border); font-size: .92rem; }
.mini-list li:last-child { border-bottom: 0; }

.badges { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.badges.compact { grid-template-columns: repeat(4, 1fr); gap: 8px; }
.badge { display: flex; gap: 12px; align-items: center; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface-2); }
.badge-icon { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; }
.badge.earned .badge-icon { background: linear-gradient(135deg, #fde68a, #f59e0b); color: #78350f; box-shadow: 0 2px 6px rgba(245, 158, 11, .35); }
.badge.earned { background: #fffbeb; border-color: #fde68a; }
.badge.locked { opacity: .65; }
.badge.locked .badge-icon { background: #e7ebf2; color: #94a3b8; }
.badge-text b { display: block; font-size: .92rem; }
.badge-text span { display: block; font-size: .8rem; color: var(--muted); line-height: 1.3; }
.badges.compact .badge { padding: 8px 10px; }
.badges.compact .badge-icon { width: 32px; height: 32px; }

/* ---------- Lektionen ---------- */
.lesson-list { display: flex; flex-direction: column; gap: 12px; }
.lesson-card {
  display: flex; align-items: center; gap: 20px; padding: 20px 24px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); color: var(--text); text-decoration: none !important; transition: border-color .15s, transform .15s;
}
.lesson-card:hover { border-color: var(--primary); transform: translateY(-1px); }
.lesson-num { width: 48px; height: 48px; border-radius: 12px; background: var(--primary-weak); color: var(--primary); display: grid; place-items: center; font-weight: 700; font-size: 1.2rem; flex-shrink: 0; }
.lesson-card.done .lesson-num { background: var(--ok); color: #fff; }
.lesson-body { flex: 1; }
.lesson-body h2 { margin: 0 0 2px; }
.lesson-body p { margin: 0 0 6px; color: var(--text-2); }
.lesson-meta { display: flex; gap: 18px; align-items: center; font-size: .85rem; color: var(--muted); }
.lesson-meta span { display: inline-flex; align-items: center; gap: 5px; }
.lesson-go { color: var(--muted); }

.lesson { padding: 32px 44px 40px; }
.lesson-header { border-bottom: 1px solid var(--border); padding-bottom: 14px; margin-bottom: 20px; }
.lesson-header h1 { margin: 8px 0 0; font-size: 2rem; }
.lesson-content { max-width: 860px; font-size: 1.03rem; }
.lesson-content h2 { margin-top: 2rem; font-size: 1.3rem; }
.lesson-content .lead { font-size: 1.12rem; color: var(--text-2); }
.lesson-content ul, .lesson-content ol { padding-left: 1.3rem; }
.lesson-content li { margin-bottom: .45em; }
.syntax-box {
  font-family: var(--mono); font-size: 1.25rem; background: #0f172a; color: #e2e8f0; padding: 18px 22px; border-radius: 10px; margin: 12px 0 16px; overflow-x: auto; white-space: nowrap;
}
.sx-a1 { color: #93c5fd; font-weight: 600; }
.sx-a2 { color: #86efac; font-weight: 600; }
.sx-a3 { color: #fca5a5; font-weight: 600; }
.sx-sep { color: #fde047; font-weight: 700; padding: 0 2px; }
dl.args { display: grid; grid-template-columns: 140px 1fr; gap: 8px 18px; margin: 0 0 16px; }
dl.args dt { font-weight: 700; font-family: var(--mono); }
dl.args dt.sx-a1 { color: #1d4ed8; }
dl.args dt.sx-a2 { color: var(--ok); }
dl.args dt.sx-a3 { color: var(--err); }
dl.args dd { margin: 0; }
.callout { border-left: 4px solid var(--primary); background: var(--primary-weak); border-radius: 0 8px 8px 0; padding: 12px 16px; margin: 14px 0; }
.callout > .ic:first-child { margin: -3px 6px 0 0; }
.callout.tip { border-color: #d4a106; background: #fffbea; }
.callout.warn { border-color: var(--warn); background: var(--warn-bg); }
ul.rules li, ol.steps li { margin-bottom: .6em; }
ol.steps { counter-reset: s; list-style: none; padding-left: 0 !important; }
ol.steps > li { counter-increment: s; position: relative; padding-left: 40px; }
ol.steps > li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 26px; height: 26px; border-radius: 50%; background: var(--primary-weak); color: var(--primary); font-weight: 700; font-size: .85rem; display: grid; place-items: center; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 12px 0 18px; }
.compare > div { border-radius: 10px; padding: 14px 16px; border: 1px solid; }
.compare-bad { background: var(--err-bg); border-color: var(--err-border) !important; }
.compare-good { background: var(--ok-bg); border-color: var(--ok-border) !important; }
.compare-label { font-weight: 700; font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; margin-bottom: 6px; }
.compare-bad .compare-label { color: var(--err); }
.compare-good .compare-label { color: var(--ok); }
.compare p { margin: 8px 0 0; font-size: .93rem; }
.compare code.formula { display: block; background: #fff; }

.complete-panel { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.complete-panel h2 { display: flex; align-items: center; gap: 8px; }
.complete-panel p { margin: 0; color: var(--text-2); }
.complete-panel .btn-row { margin-top: 0; justify-content: flex-end; }
.complete-panel.is-done { background: var(--ok-bg); border-color: var(--ok-border); }
.complete-panel.is-done h2 { color: var(--ok); }

/* ---------- Tabellen ---------- */
.table-simple { width: 100%; border-collapse: collapse; margin: 10px 0 18px; font-size: .95rem; }
.table-simple th, .table-simple td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table-simple th { background: var(--surface-2); font-weight: 600; color: var(--text-2); font-size: .85rem; }
.table-simple.narrow { width: auto; min-width: 320px; }
.table-simple.compact td, .table-simple.compact th { padding: 6px 10px; font-size: .88rem; }
.table-simple.clickable tbody tr { cursor: pointer; }
.table-simple.clickable tbody tr:hover { background: var(--primary-weak); }
.truth td.t { color: var(--ok); font-weight: 700; }
.truth td.f { color: var(--err); font-weight: 700; }

/* Excel-ähnliches Tabellenblatt */
.sheet-wrap { overflow-x: auto; margin: 10px 0; border: 1px solid var(--border-strong); border-radius: 8px; }
.sheet { border-collapse: collapse; font-size: .92rem; width: 100%; background: #fff; }
.sheet th, .sheet td { border: 1px solid #dde3ec; padding: 6px 10px; white-space: nowrap; }
.sheet thead th { background: #eef1f6; color: var(--muted); font-weight: 600; font-size: .78rem; text-align: center; }
.sheet .corner { width: 38px; }
.sheet .rownum { background: #eef1f6; color: var(--muted); font-weight: 600; font-size: .78rem; text-align: center; width: 38px; }
.sheet tr.hdr td { font-weight: 700; background: #f7f9fc; }
.sheet td.num { text-align: right; font-variant-numeric: tabular-nums; }
.sheet td.bool { text-align: center; }
.sheet .extra-col { background: #f3f6ff; }
.sheet thead .extra-col { background: #dfe7fb; color: var(--primary); }
.sheet tr.hdr .extra-col { background: #e8eefc; color: var(--primary); }
.sheet td.cell-ok { background: var(--ok-bg); color: #0f5d2d; }
.sheet td.cell-bad { background: var(--err-bg); color: #8f1d1d; font-weight: 600; }
.sheet td.cell-err { color: var(--err); font-weight: 700; }
.muted-empty { color: #a0aab8; font-style: italic; font-size: .85em; }
.sheet.editable td { padding: 0; }
.sheet.editable tr.hdr td, .sheet.editable td.result { padding: 6px 10px; }
.cell-input { width: 100%; min-width: 90px; border: 0 !important; border-radius: 0 !important; padding: 6px 10px !important; background: transparent !important; box-shadow: none !important; }
.cell-input.num { text-align: right; }
.cell-input:focus { background: #fffbe6 !important; outline: 2px solid var(--primary) !important; outline-offset: -2px; }
.sheet.editable tr.selected .rownum { background: var(--primary); color: #fff; }
.sheet.editable tr[data-row] { cursor: pointer; }

/* ---------- Formeln ---------- */
code.formula { font-family: var(--mono); background: #f6f8fb; border: 1px solid var(--border); border-radius: 6px; padding: .12em .45em; white-space: pre-wrap; word-break: break-word; color: var(--text); }
.hl-fn { color: #1d4ed8; font-weight: 700; }
.hl-ref { color: #7c3aed; font-weight: 600; }
.hl-str { color: #b45309; }
.hl-num { color: #0e7490; }
.hl-bool { color: #0f766e; font-weight: 600; }
.hl-op { color: #475569; font-weight: 700; }
.hl-punct { color: #334155; font-weight: 700; }
.fx-label { font-family: Georgia, serif; font-style: italic; font-weight: 700; color: var(--muted); padding: 0 6px; }

.example { margin: 14px 0 22px; padding: 16px 18px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; }
.example figcaption { font-size: .88rem; color: var(--muted); margin-bottom: 8px; font-weight: 600; }
.example-formula { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.example-formula code.formula { font-size: .98rem; background: #fff; flex: 1; min-width: 300px; padding: 7px 10px; }
.example .sheet { font-size: .86rem; }

/* ---------- Übungen ---------- */
.ex-group .card-head { margin-bottom: 8px; }
.ex-group-progress { display: flex; align-items: center; gap: 10px; width: 220px; font-size: .9rem; color: var(--muted); }
.ex-group-progress .bar { flex: 1; }
.hint-line { display: flex; align-items: center; gap: 6px; font-size: .9rem; color: var(--warn); }
.ex-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 8px; }
.ex-tile {
  position: relative; display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--text); text-decoration: none !important; min-height: 86px; transition: border-color .15s, transform .15s;
}
.ex-tile:hover { border-color: var(--primary); transform: translateY(-1px); }
.ex-tile b { padding-right: 26px; }
.ex-type { font-size: .8rem; color: var(--muted); }
.ex-state { position: absolute; top: 12px; right: 12px; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; border: 2px solid var(--border-strong); }
.ex-tile.st-done { border-color: var(--ok-border); background: #f6fcf8; }
.ex-tile.st-done .ex-state { background: var(--ok); border-color: var(--ok); color: #fff; }
.ex-tile.st-tried .ex-state { border-color: var(--warn-border); background: var(--warn-bg); color: var(--warn); }
.ex-points { font-size: .78rem; font-weight: 700; color: var(--ok); margin-top: auto; }

.exercise { padding: 28px 36px 32px; }
.ex-head { display: flex; gap: 8px; margin-bottom: 10px; }
.ex-prompt { font-size: 1.08rem; margin-bottom: 14px; max-width: 900px; }
.ex-prompt code.formula { font-size: 1rem; }
.data-preview { margin-bottom: 16px; }
.data-preview summary { cursor: pointer; color: var(--text-2); font-weight: 600; font-size: .92rem; padding: 4px 0; }
.answer { margin-top: 8px; }

.options { display: flex; flex-direction: column; gap: 10px; max-width: 860px; }
.option {
  position: relative; display: flex; align-items: center; gap: 14px; padding: 13px 16px; border: 1.5px solid var(--border-strong); border-radius: 10px; background: #fff;
  cursor: pointer; font: inherit; text-align: left; color: var(--text); transition: border-color .15s, background .15s;
}
.option:hover:not(:disabled) { border-color: var(--primary); background: #fafcff; }
.option input { position: absolute; opacity: 0; pointer-events: none; }
.option:has(input:checked) { border-color: var(--primary); background: var(--primary-weak); }
.opt-key { width: 30px; height: 30px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--border-strong); display: grid; place-items: center; font-weight: 700; font-size: .9rem; flex-shrink: 0; }
.option:has(input:checked) .opt-key { background: var(--primary); color: #fff; border-color: var(--primary); }
.option.is-ok { border-color: var(--ok) !important; background: var(--ok-bg) !important; }
.option.is-ok .opt-key { background: var(--ok) !important; border-color: var(--ok) !important; color: #fff; }
.option.is-bad { border-color: var(--err) !important; background: var(--err-bg) !important; }
.option.is-bad .opt-key { background: var(--err) !important; border-color: var(--err) !important; color: #fff; }
.option:disabled { cursor: default; }

.tf-row { display: flex; gap: 14px; }
.btn-tf { min-width: 180px; padding: 14px 24px; font-size: 1.05rem; background: #fff; color: var(--text); border: 1.5px solid var(--border-strong); }
.btn-tf:hover { background: var(--primary-weak); border-color: var(--primary); color: var(--primary); }
.btn-tf.is-ok { background: var(--ok); border-color: var(--ok); color: #fff; }
.btn-tf.is-bad { background: var(--err); border-color: var(--err); color: #fff; }

.formula-line, .formula-input-wrap, .formula-bar {
  display: flex; align-items: center; gap: 4px; background: #fff; border: 1.5px solid var(--border-strong); border-radius: 10px; padding: 8px 10px; max-width: 980px;
}
.formula-line:focus-within, .formula-input-wrap:focus-within, .formula-bar:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(31, 79, 209, .12); }
.formula-line { flex-wrap: wrap; font-size: 1.05rem; }
.formula-line code.formula { border: 0; background: transparent; padding: 0; font-size: 1.05rem; }
.fill-input { font-family: var(--mono) !important; font-size: 1.02rem !important; width: 240px; padding: 5px 8px !important; border: 2px dashed var(--primary) !important; background: var(--primary-weak) !important; }
.formula-input { flex: 1; font-family: var(--mono) !important; font-size: 1.08rem !important; border: 0 !important; box-shadow: none !important; padding: 6px 4px !important; background: transparent !important; }
.live-syntax { min-height: 1.6em; margin-top: 6px; font-size: .9rem; }
.live-syntax span { display: inline-flex; align-items: center; gap: 6px; }
.ex-nav { display: flex; justify-content: space-between; gap: 12px; }

/* ---------- Feedback ---------- */
.feedback { border-radius: 10px; padding: 14px 18px; margin-top: 16px; border: 1px solid; }
.feedback p { margin: 6px 0 0; }
.feedback.ok { background: var(--ok-bg); border-color: var(--ok-border); }
.feedback.err { background: var(--err-bg); border-color: var(--err-border); }
.feedback.warn { background: var(--warn-bg); border-color: var(--warn-border); }
.feedback.info { background: var(--primary-weak); border-color: #c7d5f8; }
.feedback.slim { padding: 9px 14px; }
.fb-title { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.02rem; }
.feedback.ok .fb-title { color: var(--ok); }
.feedback.err .fb-title { color: var(--err); }
.feedback.warn .fb-title { color: var(--warn); }
.feedback.info .fb-title { color: var(--primary); }
.feedback .sheet-wrap { margin-top: 12px; }
.formula-show { margin: 10px 0 4px; }
.formula-show code.formula { display: block; font-size: 1.02rem; background: #fff; padding: 8px 12px; }
.err-marker { margin: 10px 0 4px; }
.err-marker code { display: block; background: #fff; padding: 8px 12px; font-size: 1rem; white-space: pre-wrap; word-break: break-all; }
.err-marker mark { background: var(--err); color: #fff; border-radius: 3px; padding: 0 2px; }
.errpre { background: var(--surface-2); padding: 12px; border-radius: 8px; overflow: auto; }

/* ---------- Fehler-Sammlung ---------- */
.error-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.error-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.lesson-content .error-card { box-shadow: none; }
.error-card h3 { margin-bottom: 10px; }
.error-row { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 8px; }
.error-row code.formula { flex: 1; font-size: .88rem; }
.error-row.bad code.formula { background: var(--err-bg); border-color: var(--err-border); }
.error-row.good code.formula { background: var(--ok-bg); border-color: var(--ok-border); }
.error-card p { font-size: .92rem; color: var(--text-2); margin: 10px 0 0; }
.error-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.tag { display: inline-flex; align-items: center; gap: 4px; font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; padding: 4px 8px; border-radius: 6px; white-space: nowrap; min-width: 82px; justify-content: center; }
.tag-bad { background: var(--err); color: #fff; }
.tag-good { background: var(--ok); color: #fff; }

/* ---------- Formel-Tester ---------- */
.tester { padding: 22px 26px; }
.tester-toolbar { display: flex; gap: 18px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 14px; }
.tester-toolbar label { display: flex; flex-direction: column; gap: 4px; font-size: .82rem; font-weight: 600; color: var(--muted); }
.tester-toolbar select { min-width: 230px; max-width: 420px; }
.tester-toolbar .btn-row { margin: 0 0 0 auto; }
.formula-bar { max-width: none; }
.cell-name { font-family: var(--mono); font-weight: 700; background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px; color: var(--text-2); }
.insert-row { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0 4px; }
.ins { font-family: var(--mono); font-size: .88rem; padding: 5px 10px; border-radius: 6px; border: 1px solid var(--border-strong); background: #fff; cursor: pointer; color: var(--text); }
.ins:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-weak); }
.tester-grid { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 20px; margin-top: 12px; align-items: start; }
.trace h3 { font-size: .98rem; }
.trace-list { list-style: none; padding: 0; margin: 0 0 12px; display: flex; flex-direction: column; gap: 8px; }
.trace-list li { background: #fff; border: 1px solid var(--border); border-left: 4px solid; border-radius: 6px; padding: 8px 10px; font-size: .88rem; }
.trace-list li.t { border-left-color: var(--ok); }
.trace-list li.f { border-left-color: var(--err); }
.trace-fn { font-size: .74rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.trace-refs { color: var(--text-2); margin-top: 4px; font-size: .84rem; }
.trace-val { font-weight: 700; margin-top: 2px; }
.trace-list li.t .trace-val { color: var(--ok); }
.trace-list li.f .trace-val { color: var(--err); }
.trace-list li.c { border-left-color: var(--warn); }
.trace-list li.c .trace-val { color: var(--warn); }
.trace-result { border-top: 1px solid var(--border); padding-top: 10px; }

/* ---------- Quiz ---------- */
.quiz-top { display: flex; align-items: center; gap: 18px; margin-bottom: 10px; }
.quiz-top > div:first-child { flex: 1; }
.quiz-score { display: flex; align-items: center; gap: 6px; font-weight: 600; color: var(--ok); }
.quiz-card { margin-top: 18px; padding: 30px 36px; }
.quiz-q { font-size: 1.4rem; margin: 14px 0 22px; font-weight: 600; max-width: 900px; }
.quiz-q code.formula { font-size: 1.1rem; }
.quiz-start .btn-big { margin-top: 10px; }
.facts { list-style: none; padding: 0; margin: 0 0 14px; }
.facts li { display: flex; align-items: center; gap: 10px; padding: 6px 0; color: var(--text-2); }
.facts .ic { color: var(--primary); }
.result { display: flex; align-items: center; gap: 36px; padding: 32px 36px; }
.result.passed { background: linear-gradient(135deg, #fff 55%, var(--ok-bg)); }
.result.failed { background: linear-gradient(135deg, #fff 55%, var(--err-bg)); }
.result.passed h1 { color: var(--ok); }
.result.failed h1 { color: var(--err); }
.review-list { padding-left: 1.2rem; }
.review-list > li { margin-bottom: 18px; }
.review-row { display: flex; gap: 10px; align-items: center; margin-top: 6px; }
.review-list p { margin-top: 6px; }

/* ---------- Tipps ---------- */
.tips { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.tip { margin: 0; padding: 20px 22px; }
.tip-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.tip-head h2 { font-size: 1.08rem; }
.keys { display: flex; gap: 4px; align-items: center; color: var(--muted); }
.tip p { color: var(--text-2); margin: 0; }

/* ---------- Zertifikat ---------- */
.reqs h2 { margin-bottom: 8px; }
.req-list { list-style: none; padding: 0; margin: 0; }
.req-list li { display: flex; align-items: center; gap: 10px; padding: 7px 0; color: var(--err); font-weight: 500; }
.req-list li.ok { color: var(--ok); }
.cert-sheet { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 28px; max-width: 900px; margin: 10px auto 0; }
.cert-border { border: 3px double #c8a64b; border-radius: 6px; padding: 44px 56px 36px; text-align: center; position: relative; }
.is-report .cert-border { border-color: var(--border-strong); }
.cert-logo { width: 64px; height: 64px; margin: 0 auto 12px; border-radius: 14px; background: var(--primary); color: #fff; display: grid; place-items: center; font: italic 700 1.8rem Georgia, serif; }
.cert-kicker { text-transform: uppercase; letter-spacing: .3em; font-size: .9rem; color: #a0802e; font-weight: 700; }
.is-report .cert-kicker { color: var(--muted); }
.cert-title { font-size: 2.3rem; margin: 6px 0 20px; font-family: Georgia, "Times New Roman", serif; }
.cert-sub { color: var(--text-2); margin: 0; }
.cert-name { font-family: Georgia, serif; font-size: 2rem; font-weight: 700; margin: 10px auto; padding-bottom: 6px; border-bottom: 1px solid var(--border-strong); display: inline-block; min-width: 60%; }
.cert-topics { display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 8px; margin: 28px 0 22px; }
.cert-topics div { border: 1px solid var(--border); border-radius: 8px; padding: 10px 6px; font-size: .78rem; background: var(--surface-2); }
.cert-topics div.ok { border-color: var(--ok-border); background: var(--ok-bg); }
.cert-topics b { display: block; font-size: .84rem; margin-bottom: 2px; }
.cert-topics span { color: var(--muted); }
.cert-stats { display: flex; justify-content: center; gap: 44px; margin-bottom: 36px; }
.cert-stats b { display: block; font-size: 1.4rem; }
.cert-stats span { font-size: .8rem; color: var(--muted); }
.cert-foot { display: flex; justify-content: space-between; gap: 60px; text-align: left; }
.cert-foot > div { flex: 1; }
.sig-line { border-bottom: 1px solid var(--text); height: 36px; }
.cert-foot span { font-size: .8rem; color: var(--muted); }
.cert-foot small { display: block; font-size: .78rem; color: var(--text-2); }
.cert-meta { margin-top: 26px; font-size: .72rem; color: var(--muted); }

/* ---------- Lehrer-Modus ---------- */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border-strong); margin-bottom: 16px; }
.tab { border: 0; background: transparent; font: inherit; font-weight: 600; color: var(--muted); padding: 10px 16px; cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -1px; }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.lock-card { text-align: center; max-width: 560px; margin: 0 auto; padding: 36px; }
.lock-icon { width: 72px; height: 72px; border-radius: 50%; background: var(--primary-weak); color: var(--primary); display: grid; place-items: center; margin: 0 auto 18px; }
.lock-card > p { margin-top: 18px; }
.report h3 { margin-top: 22px; }
.report-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.report-head h2 { font-size: 1.5rem; margin: 0; }
.report-level { display: flex; align-items: center; gap: 10px; font-size: 1.1rem; }
.plain-list { padding-left: 1.2rem; color: var(--text-2); }

/* ---------- Einstellungen ---------- */
.sync-code { display: flex; align-items: center; gap: 12px; margin: 10px 0; }
.sync-code code { font-size: 1.5rem; letter-spacing: .12em; padding: 8px 16px; background: var(--primary-weak); border-color: #c7d5f8; color: var(--primary); font-weight: 700; }
.danger-zone { border-color: var(--err-border); }
.danger-zone h2 { color: var(--err); }

/* ---------- Toasts ---------- */
.toasts { position: fixed; right: 24px; bottom: 24px; display: flex; flex-direction: column; gap: 10px; z-index: 50; }
.toast {
  display: flex; align-items: center; gap: 8px; max-width: 420px; padding: 12px 16px; border-radius: 10px; background: #101828; color: #fff;
  box-shadow: var(--shadow-lg); font-size: .93rem; opacity: 0; transform: translateY(10px); transition: opacity .25s, transform .25s;
}
.toast.show { opacity: 1; transform: none; }
.toast-ok { background: var(--ok); }
.toast-err { background: var(--err); }
.toast-badge { background: linear-gradient(135deg, #b45309, #d97706); }

/* ---------- Druck (Zertifikat & Berichte) ---------- */
@media print {
  @page { size: A4; margin: 12mm; }
  body { background: #fff; min-width: 0; }
  .no-print, .sidebar, .topbar, .toasts { display: none !important; }
  .main-wrap { margin: 0; }
  main { padding: 0; max-width: none; }
  .card { box-shadow: none; border: 0; padding: 0; }
  .cert-sheet { box-shadow: none; padding: 0; max-width: none; }
  .cert-border { padding: 40px 48px; }
  .bar { border: 1px solid #ccc; }
  .bar-fill, .ring, .badge-icon, .chip, .tag, .cert-logo, .cert-topics div, .day { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .table-simple { page-break-inside: auto; }
  .table-simple tr { page-break-inside: avoid; }
  a { color: inherit; }
}