/* ============================================================
   Deutsch Lernen — B1 Prüfungsvorbereitung
   Eye-relaxed reading palette, Trebuchet MS, mobile-first
   ============================================================ */

:root {
  --bg: #f7f4ee;            /* warm paper */
  --bg-soft: #efebe2;
  --card: #fffdf8;
  --ink: #2e3440;           /* soft dark slate, not pure black */
  --ink-soft: #5b6470;
  --ink-faint: #8b93a0;
  --accent: #2f6f5e;        /* calm forest green */
  --accent-soft: #e3efe9;
  --accent-2: #b5573a;      /* warm terracotta for highlights */
  --accent-2-soft: #f6e8e2;
  --blue: #3d6b99;
  --blue-soft: #e4edf5;
  --gold: #c9a227;
  --line: #e3ddd0;
  --ok: #3a8a5f;
  --ok-soft: #e1f0e7;
  --bad: #b5573a;
  --bad-soft: #f6e8e2;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(46, 52, 64, .07), 0 4px 14px rgba(46, 52, 64, .05);
  --font: "Trebuchet MS", "Segoe UI", Tahoma, Verdana, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header / Nav ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 244, 238, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.05rem;
  white-space: nowrap;
}

.brand .flag {
  width: 26px; height: 26px;
  border-radius: 7px;
  background: linear-gradient(to bottom, #2e3440 33%, #b5573a 33% 66%, #c9a227 66%);
  flex: none;
}

.nav { display: flex; gap: 4px; margin-left: auto; align-items: center; }

.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding: 7px 13px;
  border-radius: 9px;
  font-weight: 600;
  font-size: .95rem;
  transition: background .15s, color .15s;
}

.nav a:hover { background: var(--bg-soft); color: var(--ink); }
.nav a.active { background: var(--accent); color: #fff; }

.lang-toggle {
  margin-left: 8px;
  border: 1.5px solid var(--line);
  background: var(--card);
  border-radius: 9px;
  padding: 6px 12px;
  font-family: var(--font);
  font-weight: 700;
  font-size: .85rem;
  color: var(--accent);
  cursor: pointer;
  transition: border-color .15s;
}
.lang-toggle:hover { border-color: var(--accent); }

/* ---------- Layout ---------- */
.wrap { max-width: 1040px; margin: 0 auto; padding: 26px 18px 80px; }

.page-head { margin: 14px 0 26px; }
.page-head h1 { font-size: 1.9rem; line-height: 1.25; }
.page-head .sub { color: var(--ink-soft); margin-top: 6px; max-width: 640px; }

.level-chip {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .06em;
  padding: 3px 11px;
  border-radius: 99px;
  margin-bottom: 10px;
}
.chip-a1 { background: var(--ok-soft); color: var(--ok); }
.chip-a2 { background: var(--blue-soft); color: var(--blue); }
.chip-b1 { background: var(--accent-2-soft); color: var(--accent-2); }

/* ---------- Dashboard cards ---------- */
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

.level-card { display: flex; flex-direction: column; gap: 10px; text-decoration: none; color: var(--ink); transition: transform .15s, box-shadow .15s; }
.level-card:hover { transform: translateY(-3px); box-shadow: 0 6px 22px rgba(46,52,64,.10); }
.level-card h2 { font-size: 1.35rem; }
.level-card .desc { color: var(--ink-soft); font-size: .95rem; flex: 1; }

.progress-track { background: var(--bg-soft); border-radius: 99px; height: 9px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 99px; background: var(--accent); transition: width .4s ease; }
.progress-label { font-size: .82rem; color: var(--ink-faint); }

/* ---------- Countdown ---------- */
.exam-banner {
  background: linear-gradient(135deg, #2f6f5e, #3d6b99);
  color: #fff;
  border-radius: var(--radius);
  padding: 26px 24px;
  margin-bottom: 26px;
  box-shadow: var(--shadow);
}
.exam-banner .label { font-size: .85rem; opacity: .85; letter-spacing: .05em; text-transform: uppercase; font-weight: 700; }
.exam-banner h2 { font-size: 1.5rem; margin: 6px 0 2px; }
.exam-banner .meta { opacity: .9; font-size: .95rem; }

.countdown { display: flex; gap: 14px; margin-top: 18px; flex-wrap: wrap; }
.count-box {
  background: rgba(255,255,255,.14);
  border-radius: 12px;
  padding: 10px 16px;
  min-width: 76px;
  text-align: center;
}
.count-box .num { font-size: 1.7rem; font-weight: 700; line-height: 1.2; }
.count-box .unit { font-size: .78rem; opacity: .85; }

/* ---------- Lessons ---------- */
.lesson-list { display: flex; flex-direction: column; gap: 14px; }

.lesson-group {
  font-size: 1.15rem;
  color: var(--accent);
  margin: 18px 0 0;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent-soft);
}
.lesson-list .lesson-group:first-child { margin-top: 0; }

.book-ref {
  margin-top: 14px;
  font-size: .9rem;
  color: var(--ink-soft);
  background: #faf3dd;
  border-left: 3px solid var(--gold);
  padding: 10px 14px;
  border-radius: 0 9px 9px 0;
}

.lesson {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.lesson-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: none;
  border: none;
  font-family: var(--font);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}
.lesson-head:hover { background: var(--bg-soft); }

.lesson-num {
  flex: none;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: .9rem;
}

.lesson-title-en { display: block; font-weight: 400; font-size: .85rem; color: var(--ink-faint); }

.lesson-check { margin-left: auto; flex: none; color: var(--ok); font-size: 1.2rem; opacity: 0; transition: opacity .2s; }
.lesson.done .lesson-check { opacity: 1; }

.lesson-arrow { flex: none; color: var(--ink-faint); transition: transform .25s; }
.lesson.open .lesson-arrow { transform: rotate(90deg); }

.lesson-body { display: none; border-top: 1px solid var(--line); }
.lesson.open .lesson-body { display: block; }

/* tabs inside lesson */
.tabs { display: flex; gap: 4px; padding: 12px 16px 0; flex-wrap: wrap; }
.tab-btn {
  border: none;
  background: var(--bg-soft);
  font-family: var(--font);
  font-weight: 700;
  font-size: .86rem;
  color: var(--ink-soft);
  padding: 8px 15px;
  border-radius: 9px 9px 0 0;
  cursor: pointer;
}
.tab-btn.active { background: var(--accent); color: #fff; }

.tab-panel { display: none; padding: 18px 20px 22px; }
.tab-panel.active { display: block; }

.tab-panel h4 { margin: 14px 0 6px; color: var(--accent); font-size: 1rem; }
.tab-panel p { margin-bottom: 10px; }
.tab-panel ul { margin: 0 0 12px 22px; }
.tab-panel li { margin-bottom: 5px; }

.translation {
  color: var(--ink-soft);
  font-size: .92rem;
  background: var(--bg-soft);
  border-left: 3px solid var(--gold);
  padding: 10px 14px;
  border-radius: 0 9px 9px 0;
  margin: 10px 0 14px;
}
body.lang-de-only .translation { display: none; }

/* grammar table */
.gtable { width: 100%; border-collapse: collapse; margin: 12px 0 16px; font-size: .94rem; }
.gtable th, .gtable td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.gtable th { background: var(--accent-soft); color: var(--accent); font-size: .85rem; }
.gtable tr:nth-child(even) td { background: var(--bg-soft); }
.gtable-scroll { overflow-x: auto; }

/* examples */
.example {
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 10px;
  background: var(--bg);
}
.example .de { font-weight: 600; }
.example .en { color: var(--ink-soft); font-size: .9rem; margin-top: 3px; }
body.lang-de-only .example .en { display: none; }

/* vocab */
.vocab-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 9px; }
.vocab-item {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: .94rem;
}
.vocab-item .de { font-weight: 700; }
.vocab-item .en { color: var(--ink-soft); font-size: .87rem; }
body.lang-de-only .vocab-item .en { visibility: hidden; }
body.lang-de-only .vocab-item .en:hover,
body.lang-de-only .vocab-item:hover .en { visibility: visible; }

/* ---------- Quiz ---------- */
.quiz-q { margin-bottom: 20px; }
.quiz-q .q-text { font-weight: 700; margin-bottom: 9px; }
.quiz-opts { display: flex; flex-direction: column; gap: 7px; }

.quiz-opt {
  font-family: var(--font);
  font-size: .96rem;
  text-align: left;
  background: var(--bg);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 11px 15px;
  cursor: pointer;
  color: var(--ink);
  transition: border-color .12s, background .12s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent); }
.quiz-opt.correct { background: var(--ok-soft); border-color: var(--ok); font-weight: 700; }
.quiz-opt.wrong { background: var(--bad-soft); border-color: var(--bad); }
.quiz-opt:disabled { cursor: default; }

.quiz-result {
  margin-top: 8px;
  padding: 14px 18px;
  border-radius: 10px;
  font-weight: 700;
  display: none;
}
.quiz-result.show { display: block; }
.quiz-result.good { background: var(--ok-soft); color: var(--ok); }
.quiz-result.meh { background: var(--accent-2-soft); color: var(--accent-2); }

.btn {
  display: inline-block;
  border: none;
  background: var(--accent);
  color: #fff;
  font-family: var(--font);
  font-weight: 700;
  font-size: .95rem;
  padding: 11px 22px;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: opacity .15s;
}
.btn:hover { opacity: .9; }
.btn.ghost { background: var(--bg-soft); color: var(--ink-soft); }

/* ---------- DTZ info blocks ---------- */
.info-block { border-left: 4px solid var(--blue); background: var(--blue-soft); padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 14px 0; }
.tip-block { border-left: 4px solid var(--gold); background: #faf3dd; padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 14px 0; }

/* ---------- Lesen-Training ---------- */
.reading-text {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 12px 0 18px;
  font-size: .96rem;
}
.reading-text h4 { color: var(--ink); margin: 12px 0 6px; }
.reading-text h4:first-child { margin-top: 0; }
.reading-text p { margin-bottom: 10px; }

.quiz-opts-row { flex-direction: row; flex-wrap: wrap; }
.quiz-opts-row .quiz-opt { min-width: 52px; text-align: center; font-weight: 700; }

.expl {
  margin-top: 9px;
  font-size: .92rem;
  background: var(--blue-soft);
  border-left: 3px solid var(--blue);
  padding: 10px 14px;
  border-radius: 0 9px 9px 0;
  color: var(--ink-soft);
}
.expl[hidden] { display: none; }

/* ---------- Grammatik-Kompendium ---------- */
.gram-controls { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }

.gram-search {
  flex: 1;
  min-width: 220px;
  font-family: var(--font);
  font-size: 1rem;
  padding: 11px 16px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--ink);
}
.gram-search:focus { outline: none; border-color: var(--accent); }

.gram-filters { display: flex; gap: 6px; }
.gram-filter {
  font-family: var(--font);
  font-weight: 700;
  font-size: .88rem;
  padding: 8px 15px;
  border: 1.5px solid var(--line);
  border-radius: 9px;
  background: var(--card);
  color: var(--ink-soft);
  cursor: pointer;
}
.gram-filter.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.gram-section { margin-top: 26px; }
.gram-section-title { font-size: 1.15rem; color: var(--accent); margin-bottom: 12px; }

.gram-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

.gram-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.gram-card-head { display: flex; align-items: center; gap: 10px; }
.gram-card-head h3 { font-size: 1rem; flex: 1; line-height: 1.3; }
.gram-card-head .level-chip { margin: 0; }

.gram-nr {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: .8rem;
  font-weight: 700;
}

.gram-sum { font-size: .93rem; color: var(--ink-soft); }
.gram-card .example { margin-bottom: 0; font-size: .92rem; }

.gram-links { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 4px; }
.gram-book { font-size: .85rem; color: var(--ink-faint); font-weight: 700; }
.gram-lesson-link { font-size: .85rem; font-weight: 700; color: var(--accent); text-decoration: none; }
.gram-lesson-link:hover { text-decoration: underline; }

.gram-empty { color: var(--ink-faint); padding: 30px 0; text-align: center; }

@media (max-width: 640px) {
  .gram-grid { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--line); margin-top: 50px; }
.footer-inner { max-width: 1040px; margin: 0 auto; padding: 22px 18px; color: var(--ink-faint); font-size: .87rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .topbar-inner { padding: 8px 10px; gap: 8px; }
  .brand span.brand-text { display: none; }
  .nav a { padding: 7px 10px; font-size: .9rem; }
  .page-head h1 { font-size: 1.5rem; }
  .exam-banner { padding: 20px 18px; }
  .count-box { min-width: 64px; padding: 8px 10px; }
  .count-box .num { font-size: 1.4rem; }
  .tab-btn { font-size: .8rem; padding: 7px 11px; }
  .lesson-head { padding: 15px 14px; gap: 10px; }
  .tab-panel { padding: 15px 14px 18px; }
}