/* ============================================================
   MNG Rämibühl – Corporate-Design Stylesheet
   Mathematisch-Naturwissenschaftliches Gymnasium Rämibühl, Zürich
   Abgeleitet aus mng.ch: Weiss/Schwarz, MNG-Blau #0076BD,
   Helvetica Neue, flache Schweizer Typografie, Haarlinien-Raster.
   Gemeinsames Stylesheet für die Algorithmen-Werkstatt.
   ============================================================ */

:root {
  /* --- Markenfarben --- */
  --blue:      #0076bd;   /* MNG-Blau, einziger Akzent */
  --blue-700:  #005d96;
  --blue-800:  #00497a;
  --blue-50:   #eaf3f9;   /* heller Blauton, Flächen */
  --blue-hi:   #b3d4fc;   /* Auswahl / Highlight */

  --ink:       #111111;   /* Text schwarz */
  --ink-2:     #3a3a3a;
  --muted:     #6b6b6b;   /* Sekundärtext */
  --muted-2:   #8c8c8c;

  --paper:     #ffffff;   /* Hintergrund */
  --paper-2:   #f6f7f8;   /* leichte Fläche (Code, Tabellenkopf) */
  --paper-3:   #eef0f2;

  --line:      #d0d0d0;   /* Haarlinie */
  --line-2:    #e3e5e8;   /* feine Haarlinie */

  --red:       #d0021b;   /* MNG-Warnrot */
  --red-50:    #fbeaec;
  --green:     #2e7d32;   /* Bestätigung (nur Feedback) */
  --green-50:  #eaf5ec;

  /* --- Kategoriale Palette für O-Klassen / Kurven ---
     gedämpft, druckfreundlich: schnell = blau, langsam = rot/schwarz */
  --c-o1:    #0076bd;
  --c-logn:  #2a8a8a;
  --c-n:     #2e7d32;
  --c-nlogn: #8a6d00;
  --c-n2:    #c0561a;
  --c-n3:    #a3324f;
  --c-2n:    #6a3d9a;
  --c-nfac:  #111111;

  /* --- Typografie --- */
  --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 3px;
  --maxw: 1080px;
}

/* ============================================================
   Basis
   ============================================================ */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--blue-hi); color: var(--ink); }

h1, h2, h3, h4 { font-family: var(--font-sans); font-weight: 800; line-height: 1.12; color: var(--ink); margin: 0 0 .5em; letter-spacing: -0.01em; }
h1 { font-size: 30px; }
h2 { font-size: 22px; }
h3 { font-size: 17px; }
p  { margin: 0 0 .8em; }
a  { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-700); text-decoration: underline; }
hr { border: 0; border-top: 1px solid var(--line); margin: 1.5rem 0; }
small { color: var(--muted); }

/* Akzent-Label / Eyebrow */
.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 8px;
}

/* ============================================================
   Kopfzeile (MNG-Marke) + Navigation
   ============================================================ */
.mng-topline { height: 3px; background: var(--blue); }

.site-header,
header.mng {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.mng-header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.mng-brand { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.mng-brand img { height: 30px; width: auto; display: block; }
.mng-brand .sep { width: 1px; height: 26px; background: var(--line); }
.mng-brand .site-title { font-size: 15px; font-weight: 800; color: var(--ink); letter-spacing: -0.01em; white-space: nowrap; }
.mng-brand .site-title span { color: var(--blue); }
.mng-brand a { text-decoration: none; color: var(--ink); display: inline-flex; align-items: center; }
.mng-brand a:hover { text-decoration: none; }
.mng-brand a.site-title:hover { color: var(--blue); }

.mng-nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.mng-nav a {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 700;
  padding: 7px 12px;
  border-radius: var(--radius);
  text-decoration: none;
}
.mng-nav a:hover { color: var(--blue); background: var(--blue-50); text-decoration: none; }
.mng-nav a.active { color: var(--blue); }

/* Zurück-Link (Themenseiten) */
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--paper);
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 7px 14px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 14px;
}
.back-link:hover { background: var(--blue); color: #fff; text-decoration: none; }

/* ============================================================
   Layout
   ============================================================ */
main { max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 64px; }
section { margin-bottom: 30px; }
.section-heading { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.section-sub { color: var(--muted); font-size: 15px; margin-bottom: 16px; }

/* ============================================================
   Flächen / Karten
   ============================================================ */
.panel, .explainer, .card-surface {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.panel h2, .explainer h2 { font-size: 19px; margin-bottom: 10px; }
.panel h3 { font-size: 16px; margin: 18px 0 8px; }
.panel p, .explainer p { color: var(--ink-2); }
.panel ul, .explainer ul { color: var(--ink-2); margin: 0 0 .8em 1.2em; padding: 0; }
.panel li { margin-bottom: 6px; }

/* Akzent-Kante links (dezent) */
.panel--accent { border-left: 3px solid var(--blue); }
.panel--warn   { border-left: 3px solid var(--red); }

.tip {
  background: var(--blue-50);
  border: 1px solid var(--line-2);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--ink-2);
  font-size: 14.5px;
}
.tip b { color: var(--ink); }

/* ============================================================
   Buttons
   ============================================================ */
.btn, button.btn,
button:not(.mc-opt):not(.mng-nav a) {
  font-family: inherit;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 14px; font-weight: 700; line-height: 1;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, color .15s, border-color .15s;
}
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-primary:hover { background: var(--blue-700); border-color: var(--blue-700); color: #fff; text-decoration: none; }
.btn-outline { background: var(--paper); color: var(--blue); border-color: var(--blue); }
.btn-outline:hover { background: var(--blue-50); text-decoration: none; }
.btn-secondary { background: var(--paper-3); color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { background: var(--paper-2); }
.btn:disabled, button:disabled { opacity: .5; cursor: not-allowed; }

/* schlichte Standardbuttons (Demos) */
.control-btn {
  background: var(--blue); color: #fff; border: 1px solid var(--blue);
  padding: 9px 16px; border-radius: var(--radius); cursor: pointer;
  font: 700 14px var(--font-sans);
}
.control-btn:hover:not(:disabled) { background: var(--blue-700); }
.control-btn.secondary { background: var(--paper-3); color: var(--ink); border-color: var(--line); }
.control-btn.secondary:hover:not(:disabled) { background: var(--paper-2); }
.control-btn:disabled { opacity: .5; cursor: not-allowed; }

/* ============================================================
   Formular-Elemente
   ============================================================ */
input[type="number"], input[type="text"], select {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 10px;
  font: inherit;
  font-size: 14px;
}
input[type="number"] { width: 72px; }
input:focus, select:focus { outline: 2px solid var(--blue-hi); outline-offset: 0; border-color: var(--blue); }
input[type="range"] { accent-color: var(--blue); }
label { font-size: 14px; color: var(--ink-2); }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 14px; }
legend { color: var(--muted); font-size: 13px; padding: 0 6px; }

.toggle-group { display: inline-flex; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.toggle-group button { background: var(--paper); color: var(--ink-2); border: 0; padding: 8px 14px; cursor: pointer; font: 700 13px var(--font-sans); }
.toggle-group button.active { background: var(--blue); color: #fff; }
.toggle-group button:not(.active):hover { background: var(--blue-50); }

/* ============================================================
   Statistik-Kacheln
   ============================================================ */
.stats, .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; }
.stat {
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.stat .label, .stat-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.stat .value, .stat-value { font-size: 22px; font-weight: 800; color: var(--ink); margin-top: 4px; }

/* ============================================================
   Chips / Badges
   ============================================================ */
.chip, .mono-chip {
  display: inline-block; padding: 4px 11px; border-radius: 999px;
  font-size: 13px; font-weight: 700;
  background: var(--paper-2); color: var(--ink-2); border: 1px solid var(--line);
}
.mono-chip, .klass-chip { font-family: var(--font-mono); }
.klass-chip {
  display: inline-block; padding: 3px 11px; border-radius: 999px;
  background: var(--blue-50); color: var(--blue-800); border: 1px solid var(--blue);
  font-weight: 800; font-size: 14px;
}

/* ============================================================
   Code
   ============================================================ */
code {
  font-family: var(--font-mono);
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  padding: 1px 6px;
  font-size: .92em;
  color: var(--ink);
}
pre { margin: 0; }
.code-block {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 0;
  overflow-x: auto;
}
.code-line { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 2px 16px; min-height: 24px; }
.code-text { font-family: var(--font-mono); font-size: 14px; white-space: pre; color: var(--ink); tab-size: 4; }
.code-line.is-head .code-text { color: var(--muted-2); font-style: italic; }
.badge { flex: 0 0 auto; font-family: var(--font-mono); font-size: 12px; padding: 1px 9px; border-radius: 999px; white-space: nowrap; }
.badge.head { background: var(--paper-3); color: var(--muted); border: 1px solid var(--line); }
.badge.runs { background: var(--blue-50); color: var(--blue-800); border: 1px solid var(--blue); }
.badge.zero { opacity: .45; }

/* einfache Syntax-Token (gedämpft) */
.kw, .tok-kw { color: var(--blue); font-weight: 700; }
.tok-str { color: var(--green); }
.tok-num { color: var(--c-n2); }
.tok-fn  { color: var(--c-2n); }
.com, .tok-com { color: var(--muted-2); font-style: italic; }

/* ============================================================
   Tabellen
   ============================================================ */
table { border-collapse: collapse; width: 100%; font-size: 14px; }
table.cheat th, table.cheat td,
.table-zone th, .table-zone td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line-2); }
table.cheat th, .table-zone th { color: var(--muted); font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; background: var(--paper-2); }
table.cheat td.k { font-family: var(--font-mono); color: var(--blue-800); font-weight: 800; white-space: nowrap; }
table.cheat tr:last-child td { border-bottom: none; }

/* ============================================================
   Feedback-Zustände
   ============================================================ */
.feedback {
  border: 1px solid var(--line);
  background: var(--paper-2);
  border-radius: var(--radius);
  padding: 14px 18px;
  text-align: center;
  color: var(--ink-2);
}
.feedback.success { background: var(--green-50); border-color: var(--green); color: #1d5d27; }
.feedback.fail    { background: var(--red-50);   border-color: var(--red);   color: #8c1220; }
.feedback.compare { background: var(--blue-50);  border-color: var(--blue);  color: var(--blue-800); }

/* ============================================================
   Multiple-Choice
   ============================================================ */
.mc { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 16px; }
.mc-q { font-size: 15.5px; color: var(--ink); margin-bottom: 6px; }
.mc-q .qnum { color: var(--blue); font-weight: 800; margin-right: 6px; }
.mc-options { display: grid; gap: 8px; margin-top: 12px; }
.mc-opt {
  text-align: left; background: var(--paper); color: var(--ink);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 11px 14px; cursor: pointer; font: 14.5px var(--font-sans);
  display: flex; align-items: center; gap: 10px; transition: background .12s, border-color .12s;
}
.mc-opt:hover:not(:disabled) { background: var(--blue-50); border-color: var(--blue); }
.mc-opt .key { flex: 0 0 auto; width: 24px; height: 24px; border-radius: var(--radius); background: var(--paper-3); color: var(--ink-2); display: inline-flex; align-items: center; justify-content: center; font-weight: 800; font-size: 13px; }
.mc-opt.correct { background: var(--green-50); border-color: var(--green); color: #1d5d27; }
.mc-opt.correct .key { background: var(--green); color: #fff; }
.mc-opt.wrong { background: var(--red-50); border-color: var(--red); color: #8c1220; }
.mc-opt.wrong .key { background: var(--red); color: #fff; }
.mc-opt:disabled { cursor: default; }
.mc-exp { margin-top: 12px; padding: 12px 15px; border-radius: var(--radius); background: var(--blue-50); border: 1px solid var(--line-2); border-left: 3px solid var(--blue); color: var(--ink-2); font-size: 14px; display: none; }
.mc-exp.show { display: block; }
.mc-exp b { color: var(--ink); }

.scorebar {
  position: sticky; top: 0; z-index: 5;
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 18px; margin-bottom: 18px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.scorebar .label { color: var(--muted); font-size: 14px; }
.scorebar .score { font-size: 20px; font-weight: 800; color: var(--blue); font-family: var(--font-mono); }

/* ============================================================
   Fortschrittsbalken
   ============================================================ */
.bar-track { background: var(--paper-3); border: 1px solid var(--line-2); border-radius: var(--radius); height: 16px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--blue); width: 0; transition: width .18s ease; }

/* ============================================================
   Fusszeile
   ============================================================ */
.mng-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--muted);
  font-size: 13px;
}
.mng-footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 20px 24px; display: flex; gap: 16px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.mng-footer a { color: var(--muted); }
.mng-footer a:hover { color: var(--blue); }

@media (max-width: 640px) {
  h1 { font-size: 24px; }
  .mng-header-inner { flex-wrap: wrap; }
  .mng-nav { margin-left: 0; width: 100%; }
}