/* ============================================
   Goethe A1 Prep — Shared Styles
   ============================================ */

/* ===== Variables & Reset ===== */
:root {
  --bg: #0a0c14;
  --surface: #1a1c25;
  --surface2: #22252f;
  --border: #2e3140;
  --border-glass: rgba(255, 255, 255, 0.06);
  --text: #e8e6e3;
  --text-dim: #8b8d97;

  /* Skill accents */
  --accent-grundlagen: #60a5fa;
  --accent-sprechen: #ff6b4a;
  --accent-schreiben: #4ecdc4;
  --accent-lesen: #ffe66d;
  --accent-horen: #a78bfa;

  /* Artikel colors — der/die/das/plural */
  --artikel-der: #60a5fa;
  --artikel-die: #f87171;
  --artikel-das: #4ade80;
  --artikel-plural: #c084fc;

  --artikel-der-bg: rgba(96, 165, 250, 0.12);
  --artikel-die-bg: rgba(248, 113, 113, 0.12);
  --artikel-das-bg: rgba(74, 222, 128, 0.12);
  --artikel-plural-bg: rgba(192, 132, 252, 0.12);

  --artikel-der-border: rgba(96, 165, 250, 0.3);
  --artikel-die-border: rgba(248, 113, 113, 0.3);
  --artikel-das-border: rgba(74, 222, 128, 0.3);
  --artikel-plural-border: rgba(192, 132, 252, 0.3);
}

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

body {
  font-family: 'Noto Sans TC', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ===== Quantum Background & Overlays ===== */
#quantum-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.ambient-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 600px 400px at 15% 20%, rgba(96,165,250,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 85% 75%, rgba(167,139,250,0.03) 0%, transparent 70%),
    radial-gradient(ellipse 400px 300px at 50% 50%, rgba(78,205,196,0.02) 0%, transparent 70%);
}

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-size: 256px;
  opacity: 0.03;
}

/* Elevate page content above canvas */
.content, header, .progress-section, .steps, .tab-bar,
.tab-panel, .skill-cards, .checklist-section, footer {
  position: relative;
  z-index: 2;
}

/* ===== Header ===== */
header {
  padding: 3rem 2rem 2rem;
  max-width: 960px;
  margin: 0 auto;
  animation: fadeUp 0.6s ease;
}

header .tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: 1px solid;
  border-radius: 3px;
  padding: 0.2em 0.7em;
  margin-bottom: 1rem;
  backdrop-filter: blur(8px);
}

header h1 {
  font-family: 'DM Serif Display', serif;
  font-size: 2.6rem;
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

header h1 .highlight {
  background: linear-gradient(135deg, var(--accent-sprechen), var(--accent-schreiben));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 520px;
}

/* ===== Back link (skill pages) ===== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--text); }

/* ===== Progress bar ===== */
.progress-section {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem 2rem;
  animation: fadeUp 0.6s ease 0.1s both;
}

.progress-bar-bg {
  background: var(--surface);
  border-radius: 6px;
  height: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 6px;
  background: linear-gradient(90deg,
    var(--accent-grundlagen), var(--accent-sprechen),
    var(--accent-schreiben), var(--accent-lesen), var(--accent-horen));
  transition: width 1s ease;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
}

/* ===== Tab System (shared across skill pages) ===== */
.tab-bar {
  display: flex;
  gap: 0.5rem;
  padding: 0 2rem;
  max-width: 960px;
  margin: 0 auto 1.5rem;
  overflow-x: auto !important;
  scrollbar-width: none !important;
  -webkit-overflow-scrolling: touch;
  animation: fadeUp 0.6s ease 0.15s both;
}
.tab-bar::-webkit-scrollbar { display: none !important; }

.tab-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  flex-shrink: 0 !important;
  min-width: fit-content !important;
}
.tab-btn:hover { background: var(--surface2); color: var(--text); }
.tab-btn.active {
  background: color-mix(in srgb, var(--pa, var(--accent-grundlagen)) 15%, var(--surface));
  border-color: var(--pa, var(--accent-grundlagen));
  color: var(--pa, var(--accent-grundlagen));
}

.tab-panel {
  display: none;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem 2rem;
}
.tab-panel.active {
  display: block;
  animation: fadeUp 0.4s ease;
}

/* ===== Accordion Steps (skill pages) ===== */
.steps {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
}

.step-group {
  margin-bottom: 2rem;
  animation: fadeUp 0.6s ease calc(var(--i, 0) * 0.12s) both;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  padding: 1.2rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: all 0.25s ease;
  user-select: none;
}
.step-header:hover {
  background: var(--surface2);
  border-color: var(--current-accent, var(--pa));
}

.step-num {
  font-family: 'DM Serif Display', serif;
  font-size: 1.8rem;
  color: var(--current-accent, var(--pa));
  min-width: 2.2rem;
  opacity: 0.9;
}

.step-info { flex: 1; }
.step-info h2 {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.step-info h2 .de {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--current-accent, var(--pa));
  background: color-mix(in srgb, var(--current-accent, var(--pa)) 12%, transparent);
  padding: 0.15em 0.5em;
  border-radius: 3px;
}
.step-info p {
  color: var(--text-dim);
  font-size: 0.82rem;
  margin-top: 0.2rem;
}

.step-toggle {
  font-size: 1.2rem;
  color: var(--text-dim);
  transition: transform 0.3s ease;
}
.step-group.open .step-toggle { transform: rotate(180deg); }

.step-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.step-group.open .step-content { max-height: 4000px; }

.step-inner {
  padding: 1.2rem 1.4rem;
  margin-top: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

/* ===== Checklist ===== */
.checklist { list-style: none; }

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.checklist li:last-child { border-bottom: none; }

.checklist input[type="checkbox"] {
  appearance: none;
  width: 18px;
  height: 18px;
  min-width: 18px;
  border: 2px solid var(--border);
  border-radius: 4px;
  margin-top: 2px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}
.checklist input[type="checkbox"]:checked {
  background: var(--current-accent, var(--pa));
  border-color: var(--current-accent, var(--pa));
}
.checklist input[type="checkbox"]:checked::after {
  content: '\2713';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--bg);
  font-weight: bold;
}

.checklist label {
  cursor: pointer;
  transition: opacity 0.2s;
}
.checklist input[type="checkbox"]:checked + label {
  opacity: 0.45;
  text-decoration: line-through;
}

/* ===== Tip box ===== */
.tip {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: color-mix(in srgb, var(--current-accent, var(--pa)) 6%, transparent);
  border-left: 3px solid var(--current-accent, var(--pa));
  border-radius: 0 6px 6px 0;
  font-size: 0.82rem;
  color: var(--text-dim);
}
.tip strong { color: var(--current-accent, var(--pa)); }

/* ===== Dashboard: Step Cards ===== */
.skill-cards {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.step-card {
  background: rgba(22, 25, 38, 0.75);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 1.3rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
  animation: fadeUp 0.6s ease calc(var(--i, 0) * 0.1s) both;
  text-decoration: none;
  color: inherit;
}
.step-card:hover {
  background: var(--surface2);
  border-color: rgba(255,255,255,0.12);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.step-card:hover .card-num {
  text-shadow: 0 0 20px var(--card-accent);
}
.step-card:hover .step-arrow {
  transform: translateX(4px);
  color: var(--card-accent);
}

.card-num {
  font-family: 'DM Serif Display', serif;
  font-size: 2rem;
  color: var(--card-accent);
  min-width: 2.4rem;
  text-align: center;
  transition: text-shadow 0.3s;
}

.step-card .card-info { flex: 1; }
.step-card .card-info h2 {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.15rem;
}
.step-card .card-info h2 .de {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--card-accent);
  background: color-mix(in srgb, var(--card-accent) 10%, transparent);
  padding: 0.15em 0.55em;
  border-radius: 3px;
  letter-spacing: 0.03em;
}
.step-card .card-info p {
  color: var(--text-dim);
  font-size: 0.8rem;
}

.card-progress {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.45rem;
}
.card-bar {
  flex: 1;
  height: 3px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
}
.card-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--card-accent);
  border-radius: 3px;
  transition: width 0.8s ease;
  box-shadow: 0 0 6px color-mix(in srgb, var(--card-accent) 40%, transparent);
}
.card-pct {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-dim);
  min-width: 2.2rem;
  text-align: right;
}

.step-arrow {
  color: var(--text-dim);
  font-size: 1.1rem;
  transition: transform 0.3s, color 0.3s;
  flex-shrink: 0;
}

.status-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.58rem;
  padding: 0.15em 0.45em;
  border-radius: 3px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.status-ready {
  color: #4ecdc4;
  background: color-mix(in srgb, #4ecdc4 12%, transparent);
}
.status-soon {
  color: var(--text-dim);
  background: rgba(255,255,255,0.05);
}
.status-building {
  color: #E67E22;
  background: color-mix(in srgb, #E67E22 12%, transparent);
}

/* ===== Artikel Color System ===== */

/* Article tags (small badges) */
.artikel-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  letter-spacing: 0.03em;
}
.artikel-tag.der {
  color: var(--artikel-der);
  background: var(--artikel-der-bg);
  border: 1px solid var(--artikel-der-border);
}
.artikel-tag.die {
  color: var(--artikel-die);
  background: var(--artikel-die-bg);
  border: 1px solid var(--artikel-die-border);
}
.artikel-tag.das {
  color: var(--artikel-das);
  background: var(--artikel-das-bg);
  border: 1px solid var(--artikel-das-border);
}
.artikel-tag.plural {
  color: var(--artikel-plural);
  background: var(--artikel-plural-bg);
  border: 1px solid var(--artikel-plural-border);
}

/* Inline article text color */
.wort-der { color: var(--artikel-der); }
.wort-die { color: var(--artikel-die); }
.wort-das { color: var(--artikel-das); }
.wort-plural { color: var(--artikel-plural); }

/* Vocab cards (left color border) */
.vocab-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  border-left: 3px solid transparent;
  transition: all 0.25s ease;
}
.vocab-card.der { border-left-color: var(--artikel-der); }
.vocab-card.die { border-left-color: var(--artikel-die); }
.vocab-card.das { border-left-color: var(--artikel-das); }
.vocab-card:hover {
  background: var(--surface2);
  transform: translateY(-1px);
}

/* Artikel selection buttons (quiz) */
.artikel-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6em 1.5em;
  border-radius: 8px;
  border: 2px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}
.artikel-btn.der {
  color: var(--artikel-der);
  border-color: var(--artikel-der-border);
}
.artikel-btn.der:hover, .artikel-btn.der.selected {
  background: var(--artikel-der-bg);
  border-color: var(--artikel-der);
  box-shadow: 0 0 16px rgba(96, 165, 250, 0.2);
}
.artikel-btn.die {
  color: var(--artikel-die);
  border-color: var(--artikel-die-border);
}
.artikel-btn.die:hover, .artikel-btn.die.selected {
  background: var(--artikel-die-bg);
  border-color: var(--artikel-die);
  box-shadow: 0 0 16px rgba(248, 113, 113, 0.2);
}
.artikel-btn.das {
  color: var(--artikel-das);
  border-color: var(--artikel-das-border);
}
.artikel-btn.das:hover, .artikel-btn.das.selected {
  background: var(--artikel-das-bg);
  border-color: var(--artikel-das);
  box-shadow: 0 0 16px rgba(74, 222, 128, 0.2);
}

/* Flashcard article glow */
.flashcard.der { box-shadow: 0 0 24px rgba(96, 165, 250, 0.08); }
.flashcard.die { box-shadow: 0 0 24px rgba(248, 113, 113, 0.08); }
.flashcard.das { box-shadow: 0 0 24px rgba(74, 222, 128, 0.08); }

/* ===== Play Button ===== */
.play-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  opacity: 0.6;
  transition: opacity 0.2s;
  padding: 0.2em;
}
.play-btn:hover { opacity: 1; }
.play-btn.playing { animation: pulse 0.5s ease infinite; }

/* ===== Grundlagen grid (legacy) ===== */
.grundlagen-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.grund-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.85rem;
}
.grund-card h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-grundlagen);
  margin-bottom: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
}

/* ===== Footer ===== */
footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-dim);
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.25); }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  header h1 { font-size: 1.8rem; }
  header, .progress-section, .steps, .skill-cards, footer,
  .tab-bar, .tab-panel {
    padding-left: 1.2rem;
    padding-right: 1.2rem;
  }
  .step-card { padding: 1rem 1.2rem; gap: 1rem; }
  .card-num { font-size: 1.6rem; min-width: 2rem; }
  .step-card .card-info h2 { font-size: 0.95rem; }
}