/* ══════════════════════════════════════════
   LearningForge — Main Stylesheet
   ══════════════════════════════════════════ */

/* ── 1. Design Tokens ──────────────────── */
:root {
  --font: 'Inter', system-ui, sans-serif;

  /* Light Mode */
  --bg: #f0f2f5;
  --bg-card: #ffffff;
  --bg-nav: rgba(255,255,255,0.85);
  --bg-input: #f8fafc;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --radius: 14px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --transition: 0.2s ease;

  /* Accent */
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-subtle: #eef2ff;

  /* Grade colors */
  --grade-1: #10b981;
  --grade-2: #22d3ee;
  --grade-3: #f59e0b;
  --grade-4: #f97316;
  --grade-5: #ef4444;
  --grade-6: #7f1d1d;

  /* Subject colors (referenced by JS) */
  --color-default: #6366f1;
}

[data-theme="dark"] {
  --bg: #0b0f1a;
  --bg-card: #141928;
  --bg-nav: rgba(14,19,36,0.9);
  --bg-input: #1e2535;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-light: #475569;
  --border: #1e2d45;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.6);
  --accent-subtle: #1e1b4b;
}

/* ── 2. Reset & Base ────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button { cursor: pointer; font-family: var(--font); }
input, textarea, select { font-family: var(--font); }

/* ── 3. Splash / Loading ────────────────── */
.splash {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: 16px;
}
.splash-logo { font-size: 56px; animation: pulse 1.5s ease-in-out infinite; }
.splash-name  { font-size: 24px; font-weight: 700; letter-spacing: -0.5px; }
.splash-name span { color: var(--accent); }

.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin  { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:0.6; } }
@keyframes fadeIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:none; } }
@keyframes slideIn { from { opacity:0; transform:translateX(-12px); } to { opacity:1; transform:none; } }

/* ── 4. Navbar ──────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 60px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 18px; letter-spacing: -0.5px;
  cursor: pointer; user-select: none;
}
.nav-brand .icon { font-size: 22px; }

.nav-center {
  display: flex; align-items: center; gap: 4px;
}
.nav-breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: 14px; color: var(--text-muted);
}
.nav-breadcrumb .crumb {
  cursor: pointer; padding: 4px 8px; border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}
.nav-breadcrumb .crumb:hover { background: var(--bg-input); color: var(--text); }
.nav-breadcrumb .sep { color: var(--text-light); }
.nav-breadcrumb .crumb.active { color: var(--text); font-weight: 500; }

.nav-links {
  display: flex; align-items: center; gap: 2px; margin-left: 16px;
}
.nav-link {
  padding: 6px 12px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; color: var(--text-muted);
  cursor: pointer; transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-link:hover { background: var(--bg-input); color: var(--text); }
.nav-link.active { background: var(--accent-subtle); color: var(--accent); font-weight: 600; }

.nav-right {
  display: flex; align-items: center; gap: 12px;
}

.btn-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border: none; background: transparent;
  border-radius: var(--radius-sm);
  font-size: 18px; color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.btn-icon:hover { background: var(--bg-input); color: var(--text); }

.user-chip {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 12px 4px 4px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--bg-card);
  cursor: pointer; position: relative;
  transition: box-shadow var(--transition);
}
.user-chip:hover { box-shadow: var(--shadow-sm); }
.user-chip .avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600; overflow: hidden;
}
.user-chip .avatar img { width: 100%; height: 100%; object-fit: cover; }
.user-chip .uname { font-size: 13px; font-weight: 500; }

.user-dropdown {
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 180px; overflow: hidden;
  display: none;
  animation: fadeIn 0.15s ease;
}
.user-chip.open .user-dropdown { display: block; }
.user-dropdown a, .user-dropdown button {
  display: block; width: 100%;
  padding: 10px 16px; font-size: 14px; text-align: left;
  border: none; background: transparent; color: var(--text);
  transition: background var(--transition);
}
.user-dropdown a:hover, .user-dropdown button:hover { background: var(--bg-input); }
.user-dropdown .divider { height: 1px; background: var(--border); margin: 4px 0; }
.user-dropdown .danger { color: #ef4444 !important; }

/* ── 5. Page wrapper ────────────────────── */
#app { min-height: 100vh; }

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 24px 40px;
  animation: fadeIn 0.25s ease;
}

.page-header { margin-bottom: 32px; }
.page-header h1 { font-size: 28px; font-weight: 800; letter-spacing: -0.5px; }
.page-header .sub { margin-top: 6px; color: var(--text-muted); font-size: 15px; }

/* ── 6. Cards ───────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow); }

/* Subject cards */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.subject-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative; overflow: hidden;
  animation: fadeIn 0.3s ease both;
}
.subject-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.subject-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--subject-color, var(--accent));
}
.subject-card .s-icon {
  font-size: 32px; margin-bottom: 12px;
}
.subject-card .s-name {
  font-size: 17px; font-weight: 700; margin-bottom: 4px;
}
.subject-card .s-meta {
  font-size: 13px; color: var(--text-muted);
}
.subject-card .s-grade {
  position: absolute; top: 16px; right: 16px;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  font-size: 14px; font-weight: 700; color: #fff;
  background: var(--subject-color, var(--accent));
}

/* Year cards */
.years-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.year-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer; text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.year-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.year-card .y-name { font-size: 16px; font-weight: 600; }
.year-card .y-count { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* Topic cards */
.topics-list { display: flex; flex-direction: column; gap: 10px; }
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  transition: transform var(--transition), box-shadow var(--transition);
}
.topic-card:hover { transform: translateX(3px); box-shadow: var(--shadow-sm); }
.topic-card .t-info { display: flex; flex-direction: column; gap: 3px; }
.topic-card .t-name { font-size: 15px; font-weight: 600; }
.topic-card .t-desc { font-size: 13px; color: var(--text-muted); }
.topic-card .t-right { display: flex; align-items: center; gap: 10px; }
.topic-card .t-grade {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; font-size: 13px; font-weight: 700; color: #fff;
}
.topic-card .t-arrow { color: var(--text-light); font-size: 18px; }

/* ── 7. Stats bar ───────────────────────── */
.stats-bar {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 32px;
}
.stat-chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 8px 16px;
  display: flex; align-items: center; gap: 8px;
  font-size: 14px;
}
.stat-chip .stat-val { font-weight: 700; font-size: 16px; }
.stat-chip .stat-lbl { color: var(--text-muted); }

/* ── 8. Buttons ─────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 10px 20px;
  border: none; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  user-select: none;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.35);
}
.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(99,102,241,0.45);
}
.btn-secondary {
  background: var(--bg-input); color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { background: var(--border); }
.btn-danger { background: #ef4444; color: #fff; }
.btn-danger:hover:not(:disabled) { background: #dc2626; }
.btn-ghost {
  background: transparent; color: var(--text-muted);
}
.btn-ghost:hover { background: var(--bg-input); color: var(--text); }
.btn-full { width: 100%; }
.btn-lg { padding: 13px 28px; font-size: 16px; border-radius: var(--radius); }
.btn-sm { padding: 7px 14px; font-size: 13px; }

/* ── 9. Forms ───────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block; margin-bottom: 6px;
  font-size: 13px; font-weight: 600; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.4px;
}
.form-input {
  width: 100%; padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input); color: var(--text);
  font-size: 15px;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-input::placeholder { color: var(--text-light); }

.form-textarea {
  resize: vertical; min-height: 100px; line-height: 1.6;
}

/* ── 10. Login page ─────────────────────── */
.login-wrap {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background: var(--bg);
}
.login-card {
  width: 100%; max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px;
  box-shadow: var(--shadow-lg);
  animation: fadeIn 0.3s ease;
}
.login-logo {
  text-align: center; margin-bottom: 28px;
}
.login-logo .logo-icon { font-size: 44px; }
.login-logo h1 { font-size: 24px; font-weight: 800; letter-spacing: -0.5px; margin-top: 8px; }
.login-logo p { font-size: 14px; color: var(--text-muted); margin-top: 4px; }

.divider {
  display: flex; align-items: center; gap: 12px;
  margin: 20px 0; color: var(--text-light); font-size: 13px;
}
.divider::before, .divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}

.google-btn {
  width: 100%; padding: 11px;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
}
.google-btn:hover { background: var(--bg-input); box-shadow: var(--shadow-sm); }
.google-btn svg { width: 18px; height: 18px; }

.toggle-auth {
  text-align: center; margin-top: 20px; font-size: 14px; color: var(--text-muted);
}
.toggle-auth button {
  background: none; border: none; color: var(--accent);
  font-weight: 600; font-size: 14px; cursor: pointer;
}
.toggle-auth button:hover { text-decoration: underline; }

.error-msg {
  background: #fef2f2; border: 1px solid #fecaca;
  color: #dc2626; border-radius: var(--radius-sm);
  padding: 10px 14px; font-size: 13px; margin-bottom: 16px;
}
[data-theme="dark"] .error-msg {
  background: #2d1515; border-color: #7f1d1d;
}

/* ── 11. Topic page ─────────────────────── */
.topic-page { max-width: 800px; }

.topic-header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
  position: relative; overflow: hidden;
}
.topic-header::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--subject-color, var(--accent));
}
.topic-header h1 { font-size: 26px; font-weight: 800; letter-spacing: -0.5px; }
.topic-header .badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: var(--radius-pill);
  font-size: 12px; font-weight: 600; margin-top: 8px;
  background: var(--accent-subtle); color: var(--accent);
}

.content-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px; margin-bottom: 24px;
}
.content-block h2 { font-size: 18px; font-weight: 700; margin-bottom: 16px; }
.content-block .content-body { line-height: 1.8; color: var(--text); }
.content-body p { margin-bottom: 12px; }
.content-body ul, .content-body ol { padding-left: 20px; margin-bottom: 12px; }
.content-body li { margin-bottom: 6px; line-height: 1.7; }
.content-body strong { font-weight: 600; }
.content-body h3 { font-size: 16px; font-weight: 700; margin: 20px 0 8px; }
.content-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px; margin: 16px 0; color: var(--text-muted);
  font-style: italic;
}

/* ── 12. Test engine ────────────────────── */
.test-start {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
}
.test-start h2 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.test-start p { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }

.time-selector {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 24px;
}
.time-btn {
  padding: 10px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input); color: var(--text);
  font-size: 14px; font-weight: 600; cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.time-btn.active {
  border-color: var(--accent);
  background: var(--accent-subtle); color: var(--accent);
}
.time-btn:hover:not(.active) { border-color: var(--text-muted); }

.time-hint {
  font-size: 13px; color: var(--text-muted);
  background: var(--bg-input); border-radius: var(--radius-sm);
  padding: 10px 14px; margin-bottom: 20px;
  border-left: 3px solid var(--accent);
}

/* Active test */
.test-active { animation: fadeIn 0.2s ease; }

.test-topbar {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 20px; margin-bottom: 20px;
}
.test-progress { font-size: 14px; color: var(--text-muted); }
.test-progress strong { color: var(--text); }
.timer {
  font-size: 18px; font-weight: 700; font-variant-numeric: tabular-nums;
  padding: 6px 14px; border-radius: var(--radius-sm);
  background: var(--bg-input);
}
.timer.warning { color: #f59e0b; background: #fffbeb; }
.timer.danger  { color: #ef4444; background: #fef2f2; animation: pulse 0.8s ease-in-out infinite; }
[data-theme="dark"] .timer.warning { background: #2d2000; }
[data-theme="dark"] .timer.danger  { background: #2d0f0f; }

.question-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 16px;
}
.question-num {
  font-size: 12px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.6px; color: var(--text-light); margin-bottom: 10px;
}
.question-text { font-size: 16px; font-weight: 600; line-height: 1.6; margin-bottom: 18px; }
.question-points {
  display: inline-flex; align-items: center;
  background: var(--accent-subtle); color: var(--accent);
  padding: 3px 8px; border-radius: var(--radius-pill);
  font-size: 12px; font-weight: 700; margin-bottom: 14px;
}

.mc-options { display: flex; flex-direction: column; gap: 10px; }
.mc-option {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-radius: var(--radius-sm);
  border: 2px solid var(--border); cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.mc-option:hover { border-color: var(--accent); background: var(--accent-subtle); }
.mc-option input[type="radio"] { accent-color: var(--accent); }
.mc-option.selected { border-color: var(--accent); background: var(--accent-subtle); }

/* ── 13. Results ────────────────────────── */
.results-page { animation: fadeIn 0.3s ease; }

.grade-display {
  text-align: center; padding: 32px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 24px;
}
.grade-circle {
  width: 100px; height: 100px; border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  font-size: 36px; font-weight: 800; color: #fff;
}
.grade-label { font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.grade-points { font-size: 15px; color: var(--text-muted); }

.results-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
.result-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
}
.result-item .r-header {
  display: flex; justify-content: space-between; align-items: start;
  margin-bottom: 8px;
}
.result-item .r-question { font-size: 14px; font-weight: 600; flex: 1; padding-right: 12px; }
.result-item .r-pts {
  font-size: 13px; font-weight: 700; white-space: nowrap;
  padding: 3px 8px; border-radius: var(--radius-pill);
}
.r-pts.full    { background: #d1fae5; color: #065f46; }
.r-pts.partial { background: #fef3c7; color: #92400e; }
.r-pts.zero    { background: #fee2e2; color: #991b1b; }
[data-theme="dark"] .r-pts.full    { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .r-pts.partial { background: #451a03; color: #fde68a; }
[data-theme="dark"] .r-pts.zero    { background: #450a0a; color: #fca5a5; }
.result-item .r-answer { font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.result-item .r-feedback { font-size: 13px; color: var(--text); }

.copy-section {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.copy-section p { font-size: 14px; color: var(--text-muted); }

/* ── 14. Profile ────────────────────────── */
.profile-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-bottom: 24px;
}
@media(max-width: 600px) { .profile-grid { grid-template-columns: 1fr; } }

.profile-info-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.profile-avatar-large {
  width: 72px; height: 72px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 700; margin-bottom: 16px;
}
.profile-name { font-size: 20px; font-weight: 700; }
.profile-email { font-size: 14px; color: var(--text-muted); margin-top: 4px; }

.grades-overview {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.grades-overview h3 { font-size: 16px; font-weight: 700; margin-bottom: 16px; }
.grade-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px;
}
.grade-row:last-child { border-bottom: none; }
.grade-badge {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: #fff;
}

/* ── 15. Section titles ─────────────────── */
.section-title {
  font-size: 13px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.6px; color: var(--text-muted);
  margin-bottom: 16px;
}

/* ── 16. Subject color accent bar ────────── */
.subject-color-bar {
  height: 6px; border-radius: var(--radius-pill);
  background: var(--subject-color, var(--accent));
  margin-bottom: 20px;
}

/* ── 17. Empty state ────────────────────── */
.empty-state {
  text-align: center; padding: 48px 24px;
  color: var(--text-muted); font-size: 15px;
}
.empty-state .empty-icon { font-size: 40px; margin-bottom: 12px; }

/* ── 18. Toast ──────────────────────────── */
.toast-container {
  position: fixed; bottom: 24px; right: 24px; z-index: 999;
  display: flex; flex-direction: column; gap: 8px;
}
.toast {
  padding: 12px 18px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; color: #fff;
  box-shadow: var(--shadow-lg);
  animation: fadeIn 0.2s ease;
  max-width: 320px;
}
.toast.success { background: #10b981; }
.toast.error   { background: #ef4444; }
.toast.info    { background: var(--accent); }

/* ── 19. Progress bar ───────────────────── */
.progress-bar {
  width: 100%; height: 6px; background: var(--border);
  border-radius: var(--radius-pill); overflow: hidden;
}
.progress-fill {
  height: 100%; border-radius: var(--radius-pill);
  background: var(--accent);
  transition: width 0.4s ease;
}

/* ── 20. Dashboard Extras ───────────────── */
.dash-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}
.streak-badge {
  background: linear-gradient(135deg, #f97316, #ef4444);
  color: #fff; font-weight: 700; font-size: 14px;
  padding: 8px 16px; border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px rgba(249,115,22,0.4);
  white-space: nowrap;
}

/* Subject card with progress ring */
.s-card-top { display: flex; justify-content: space-between; align-items: flex-start; }
.progress-ring { width: 48px; height: 48px; flex-shrink: 0; }
.s-avg-grade {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  font-size: 12px; font-weight: 700; color: #fff;
  margin-top: 10px;
}

/* Needs attention */
.attention-list { display: flex; flex-direction: column; gap: 8px; }
.attention-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-left: 3px solid var(--subject-color, var(--accent));
  border-radius: var(--radius-sm); padding: 12px 16px;
  cursor: pointer; transition: transform var(--transition), box-shadow var(--transition);
}
.attention-item:hover { transform: translateX(3px); box-shadow: var(--shadow-sm); }
.att-icon { font-size: 20px; }
.att-info { flex: 1; }
.att-name { font-size: 14px; font-weight: 600; }
.att-sub  { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.att-grade {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: #fff; flex-shrink: 0;
}

/* Recent tests */
.recent-list { display: flex; flex-direction: column; gap: 8px; }
.recent-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 16px;
  cursor: pointer; transition: transform var(--transition);
}
.recent-item:hover { transform: translateX(3px); }
.recent-icon { font-size: 20px; }
.recent-info { flex: 1; }
.recent-name { font-size: 14px; font-weight: 600; }
.recent-sub  { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.recent-grade {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: #fff; flex-shrink: 0;
}

/* Setup banner */
.setup-banner {
  background: var(--bg-card); border: 1px solid #f59e0b;
  border-radius: var(--radius); padding: 32px; text-align: center;
}
.setup-banner .setup-icon { font-size: 40px; margin-bottom: 12px; }
.setup-banner h2 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.setup-banner p { color: var(--text-muted); margin-bottom: 8px; }
.setup-banner code { background: var(--bg-input); padding: 2px 6px; border-radius: 4px; font-size: 13px; }

/* ── 21. Statistiken ────────────────────── */
.stats-overview-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px; margin-bottom: 20px;
}
.stat-overview-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 16px; text-align: center;
}
.soc-val { font-size: 32px; font-weight: 800; letter-spacing: -1px; }
.soc-lbl { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.stats-section-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 0;
}
@media(max-width: 700px) { .stats-section-grid { grid-template-columns: 1fr; } }

.stats-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.stats-card-title {
  font-size: 14px; font-weight: 700; margin-bottom: 16px;
}

/* Subject bars */
.subj-bars { display: flex; flex-direction: column; gap: 12px; }
.subj-bar-row { display: flex; align-items: center; gap: 10px; }
.subj-bar-label {
  width: 150px; flex-shrink: 0;
  font-size: 13px; font-weight: 500;
  display: flex; flex-direction: column; gap: 2px;
}
.subj-bar-meta { font-size: 11px; color: var(--text-muted); }
.subj-bar-track {
  flex: 1; height: 8px; background: var(--border);
  border-radius: var(--radius-pill); overflow: hidden;
}
.subj-bar-fill { height: 100%; border-radius: var(--radius-pill); transition: width 0.6s ease; }
.subj-bar-pct { width: 36px; text-align: right; font-size: 12px; font-weight: 700; }

/* Grade distribution */
.grade-distribution {
  display: flex; align-items: flex-end; justify-content: space-around;
  height: 100px; gap: 4px; margin-bottom: 8px;
}
.grade-dist-col { display: flex; flex-direction: column; align-items: center; flex: 1; }
.grade-dist-bar-wrap { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 88px; }
.grade-dist-count { font-size: 11px; font-weight: 700; color: var(--text-muted); margin-bottom: 3px; min-height: 14px; }
.grade-dist-bar { width: 80%; min-height: 8px; border-radius: 4px 4px 0 0; transition: height 0.5s ease; }
.grade-dist-label { font-size: 12px; font-weight: 700; color: var(--text-muted); margin-top: 4px; }
.grade-dist-legend { font-size: 11px; color: var(--text-light); text-align: center; }

/* Stats table */
.table-wrap { overflow-x: auto; }
.stats-table {
  width: 100%; border-collapse: collapse; font-size: 13px;
}
.stats-table th {
  text-align: left; padding: 8px 12px;
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.4px; color: var(--text-muted);
  border-bottom: 2px solid var(--border);
}
.stats-table td {
  padding: 10px 12px; border-bottom: 1px solid var(--border);
}
.stats-table tr:last-child td { border-bottom: none; }
.stats-table tr:hover td { background: var(--bg-input); }
.grade-pill {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 50%;
  font-size: 12px; font-weight: 700; color: #fff;
}

/* ── 22. Einstellungen ──────────────────── */
.settings-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.settings-section-title {
  font-size: 15px; font-weight: 700; margin-bottom: 6px;
}
.settings-hint {
  font-size: 13px; color: var(--text-muted); margin-bottom: 20px;
}
.settings-color-list { display: flex; flex-direction: column; gap: 4px; }
.settings-color-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 0; border-bottom: 1px solid var(--border);
}
.settings-color-row:last-child { border-bottom: none; }
.settings-subject-info { display: flex; align-items: center; gap: 10px; }
.settings-icon { font-size: 20px; }
.settings-name { font-size: 15px; font-weight: 500; }
.settings-color-right { display: flex; align-items: center; gap: 10px; }
.settings-color-preview {
  width: 28px; height: 28px; border-radius: 50%;
  border: 2px solid var(--border); flex-shrink: 0;
  transition: background var(--transition);
}
.color-picker {
  width: 36px; height: 36px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--border); cursor: pointer;
  padding: 2px; background: var(--bg-input);
}
.settings-actions {
  display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap;
}

/* ── 23. Responsive ─────────────────────── */
@media (max-width: 600px) {
  .settings-color-row { flex-direction: column; align-items: flex-start; gap: 8px; }
  .settings-color-right { width: 100%; justify-content: flex-start; }
}

@media (max-width: 768px) {
  .page { padding: 72px 16px 32px; }
  .subjects-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .nav-center { display: none; }
  .hamburger { display: flex !important; }
  .user-chip .uname { display: none; }
  .login-card { padding: 28px 20px; }
  .test-topbar { flex-direction: column; gap: 8px; text-align: center; }
  .stats-section-grid { grid-template-columns: 1fr; }
  .profile-grid { grid-template-columns: 1fr; }
}

/* ── 24. Nav separator ──────────────────── */
.nav-sep-bar {
  color: var(--border);
  font-size: 18px;
  font-weight: 300;
  padding: 0 4px;
  user-select: none;
  line-height: 1;
}

/* ── 25. Topic Tabs ─────────────────────── */
.topic-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 20px;
}
.tab-btn {
  padding: 10px 20px;
  border: none; background: transparent;
  font-size: 14px; font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.tab-btn:hover { background: var(--bg-input); color: var(--text); }
.tab-btn.active {
  color: var(--subject-color, var(--accent));
  border-bottom-color: var(--subject-color, var(--accent));
}
.tab-panel { animation: fadeIn 0.2s ease; }

/* ── 26. Üben mode ──────────────────────── */
.ueben-start {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
}
.ueben-start h2 { font-size: 20px; font-weight: 700; }
.ueben-start p  { color: var(--text-muted); font-size: 14px; }

.ueben-active { animation: fadeIn 0.2s ease; }

.ueben-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 16px;
}
.ueben-progress-txt { font-size: 13px; color: var(--text-muted); white-space: nowrap; }

.ueben-mc-options { display: flex; flex-direction: column; gap: 10px; }
.ueben-mc-option {
  width: 100%; text-align: left;
  padding: 12px 16px; border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--bg-input); color: var(--text);
  font-size: 14px; font-weight: 500;
  transition: border-color var(--transition), background var(--transition);
}
.ueben-mc-option:hover { border-color: var(--accent); background: var(--accent-subtle); }
.ueben-mc-option.ueben-correct {
  border-color: #10b981; background: #d1fae5; color: #065f46;
}
.ueben-mc-option.ueben-wrong {
  border-color: #ef4444; background: #fee2e2; color: #991b1b;
}
[data-theme="dark"] .ueben-mc-option.ueben-correct { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .ueben-mc-option.ueben-wrong   { background: #450a0a; color: #fca5a5; }

.ueben-feedback-box {
  margin-top: 14px; padding: 14px 16px;
  border-radius: var(--radius-sm); font-size: 14px; line-height: 1.6;
}
.ueben-feedback-box.ok   { background: #d1fae5; color: #065f46; border-left: 3px solid #10b981; }
.ueben-feedback-box.fail { background: #fee2e2; color: #991b1b; border-left: 3px solid #ef4444; }
.ueben-feedback-box.info { background: var(--accent-subtle); color: var(--text); border-left: 3px solid var(--accent); }
[data-theme="dark"] .ueben-feedback-box.ok   { background: #064e3b; color: #6ee7b7; }
[data-theme="dark"] .ueben-feedback-box.fail { background: #450a0a; color: #fca5a5; }

/* ── 27. Print / DIN A4 ─────────────────── */
.print-area { display: none; }

@media print {
  @page {
    size: A4 portrait;
    margin: 20mm 18mm;
  }

  .no-print { display: none !important; }

  .print-area {
    display: block;
    font-family: 'Inter', Arial, sans-serif;
    font-size: 11pt;
    color: #000;
    line-height: 1.5;
  }

  .print-header {
    border-bottom: 2pt solid #000;
    padding-bottom: 8pt;
    margin-bottom: 12pt;
  }
  .print-title {
    font-size: 18pt; font-weight: 800;
    letter-spacing: -0.5px;
  }
  .print-subtitle {
    font-size: 12pt; color: #444; margin-top: 3pt;
  }

  .print-meta-row {
    display: flex; gap: 0;
    border: 1pt solid #ccc;
    border-radius: 4pt;
    overflow: hidden;
    margin-bottom: 14pt;
  }
  .print-meta-item {
    flex: 1; padding: 7pt 10pt;
    border-right: 1pt solid #ccc;
    display: flex; flex-direction: column; gap: 2pt;
  }
  .print-meta-item:last-child { border-right: none; }
  .print-meta-item span { font-size: 8pt; color: #666; text-transform: uppercase; letter-spacing: 0.4px; }
  .print-meta-item strong { font-size: 11pt; }

  .print-grade-badge {
    display: inline-block;
    padding: 1pt 8pt;
    border-radius: 12pt;
    color: #fff !important;
    font-weight: 700;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .print-divider {
    height: 1pt; background: #ddd; margin: 0 0 14pt;
  }

  .print-question {
    margin-bottom: 14pt;
    padding-bottom: 12pt;
    border-bottom: 0.5pt solid #eee;
    page-break-inside: avoid;
  }
  .print-question:last-child { border-bottom: none; }

  .print-q-header {
    display: flex; justify-content: space-between;
    align-items: baseline; margin-bottom: 4pt;
  }
  .print-q-num { font-size: 9pt; font-weight: 700; text-transform: uppercase; color: #888; letter-spacing: 0.5px; }
  .print-q-pts { font-size: 9pt; font-weight: 700; color: #555; }
  .print-q-text { font-size: 11pt; font-weight: 600; margin-bottom: 5pt; }
  .print-q-answer { font-size: 10pt; color: #333; margin-bottom: 3pt; }
  .print-q-feedback { font-size: 10pt; color: #444; font-style: italic; }

  .print-footer {
    margin-top: 20pt;
    font-size: 8pt; color: #aaa;
    text-align: right;
    border-top: 0.5pt solid #ddd;
    padding-top: 6pt;
  }

  /* Hide everything else on print */
  body > *:not(#app) { display: none !important; }
  .navbar { display: none !important; }
}

/* ── 28. Rich content (meta.json HTML) ───── */
.content-body .lf-box {
  padding: 14px 18px; border-radius: var(--radius-sm);
  margin: 14px 0; font-size: 14px; line-height: 1.7;
}
.content-body .lf-info   { background: #eff6ff; border-left: 4px solid #3b82f6; color: #1e40af; }
.content-body .lf-tip    { background: #f0fdf4; border-left: 4px solid #10b981; color: #065f46; }
.content-body .lf-warn   { background: #fffbeb; border-left: 4px solid #f59e0b; color: #78350f; }
.content-body .lf-danger { background: #fef2f2; border-left: 4px solid #ef4444; color: #991b1b; }
.content-body .lf-formula {
  background: #1e293b; color: #e2e8f0; border-left: none;
  font-family: 'Courier New', monospace; font-size: 16px;
  text-align: center; padding: 20px 24px; letter-spacing: 0.5px;
  border-radius: var(--radius-sm);
}
[data-theme="dark"] .content-body .lf-info   { background: #1e3a5f; color: #93c5fd; border-color: #3b82f6; }
[data-theme="dark"] .content-body .lf-tip    { background: #064e3b; color: #6ee7b7; border-color: #10b981; }
[data-theme="dark"] .content-body .lf-warn   { background: #451a03; color: #fde68a; border-color: #f59e0b; }
[data-theme="dark"] .content-body .lf-danger { background: #450a0a; color: #fca5a5; border-color: #ef4444; }

.content-body .lf-key {
  border: 2px solid var(--accent); border-radius: var(--radius);
  padding: 16px 20px; margin: 16px 0; background: var(--accent-subtle);
}
.content-body .lf-key-title {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.6px; color: var(--accent); margin-bottom: 8px;
}
.content-body .lf-key-body { font-size: 14px; line-height: 1.7; }

.content-body .lf-two-col {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 14px 0;
}
@media (max-width: 600px) { .content-body .lf-two-col { grid-template-columns: 1fr; } }

.content-body .lf-def { margin: 14px 0; }
.content-body .lf-def dt {
  font-weight: 700; color: var(--accent); font-size: 15px; margin-top: 10px;
}
.content-body .lf-def dd {
  margin-left: 0; font-size: 14px; line-height: 1.7;
  padding-left: 12px; border-left: 2px solid var(--border); margin-top: 4px;
}

.content-body .lf-steps {
  list-style: none; padding: 0; margin: 14px 0;
  counter-reset: lf-step; display: flex; flex-direction: column; gap: 10px;
}
.content-body .lf-steps li {
  counter-increment: lf-step; display: flex; align-items: flex-start; gap: 12px;
  font-size: 14px; line-height: 1.7;
}
.content-body .lf-steps li::before {
  content: counter(lf-step);
  min-width: 28px; height: 28px;
  background: var(--accent); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}

.content-body .lf-hl {
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(99,102,241,0.3));
  color: var(--accent); padding: 1px 6px; border-radius: 4px; font-weight: 600;
}

.content-body .lf-img {
  max-width: 100%; border-radius: var(--radius-sm);
  box-shadow: var(--shadow); margin: 16px 0; display: block;
}
.content-body .lf-img-caption {
  font-size: 12px; color: var(--text-light);
  text-align: center; margin-top: -8px; margin-bottom: 16px;
}

.content-body .lf-table {
  width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px;
}
.content-body .lf-table th {
  background: var(--bg-input); font-weight: 600;
  padding: 8px 12px; text-align: left; border-bottom: 2px solid var(--border);
}
.content-body .lf-table td { padding: 8px 12px; border-bottom: 1px solid var(--border); }
.content-body .lf-table tr:last-child td { border-bottom: none; }
.content-body .lf-table tr:hover td { background: var(--bg-input); }

/* ── 29. Leaderboard ────────────────────── */
.lb-main {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 8px;
}
.lb-main-title {
  font-size: 15px; font-weight: 700; padding: 16px 20px;
  border-bottom: 1px solid var(--border); background: var(--bg-input);
}
.lb-header-row {
  display: flex; align-items: center; gap: 12px; padding: 8px 20px;
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px; color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.lb-row {
  display: flex; align-items: center; gap: 12px; padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.lb-row:last-child { border-bottom: none; }
.lb-row:hover { background: var(--bg-input); }
.lb-row.lb-me { background: var(--accent-subtle); }
.lb-row.lb-me:hover { filter: brightness(0.97); }
.lb-rank {
  width: 40px; flex-shrink: 0; font-size: 16px;
  font-weight: 700; text-align: center;
}
.lb-avatar {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; overflow: hidden;
}
.lb-name {
  flex: 1; font-size: 14px; font-weight: 600;
  display: flex; align-items: center; gap: 6px;
  min-width: 0;
}
.lb-me-tag {
  font-size: 10px; font-weight: 700;
  background: var(--accent); color: #fff;
  padding: 1px 6px; border-radius: var(--radius-pill); white-space: nowrap;
}
.lb-meta { width: 80px; flex-shrink: 0; font-size: 12px; color: var(--text-muted); text-align: right; }
.lb-score { width: 60px; flex-shrink: 0; font-size: 16px; font-weight: 800; text-align: right; }

.lb-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px;
}
.lb-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.lb-card-head {
  padding: 12px 16px; font-size: 14px; font-weight: 700;
  background: var(--bg-input); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px;
}
.lb-card .lb-row  { padding: 10px 16px; }
.lb-card .lb-rank { width: 28px; font-size: 14px; }
.lb-card .lb-avatar { width: 28px; height: 28px; font-size: 11px; }
.lb-card .lb-score { font-size: 14px; width: 48px; }
.lb-card .lb-meta  { width: 60px; }

.penalty-banner {
  background: #fee2e2; border: 1px solid #fecaca; color: #991b1b;
  border-radius: var(--radius-sm); padding: 14px 18px;
  font-size: 14px; font-weight: 600; text-align: center; margin-bottom: 16px;
}
[data-theme="dark"] .penalty-banner { background: #450a0a; border-color: #7f1d1d; color: #fca5a5; }

/* ── 30. Mobile nav ─────────────────────── */
.hamburger { display: none; }

.mobile-nav {
  display: none; flex-direction: column; padding: 8px;
  position: fixed; top: 60px; left: 0; right: 0; z-index: 98;
  background: var(--bg-card); border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  animation: fadeIn 0.15s ease;
}
.mobile-nav.open { display: flex; }

.mobile-nav-link {
  padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 500; color: var(--text);
  cursor: pointer; transition: background var(--transition);
}
.mobile-nav-link:hover, .mobile-nav-link.mnl-active {
  background: var(--bg-input); color: var(--accent);
}
.mobile-nav-sep  { height: 1px; background: var(--border); margin: 4px 0; }
.mobile-nav-danger { color: #ef4444 !important; }

/* ── 31. Responsive (additional) ───────── */
@media (max-width: 480px) {
  .page-header h1 { font-size: 22px; }
  .subjects-grid  { grid-template-columns: 1fr 1fr; gap: 10px; }
  .subject-card   { padding: 14px; }
  .tab-btn        { padding: 8px 10px; font-size: 13px; }
  .stats-bar      { gap: 8px; }
  .stat-chip      { padding: 6px 12px; font-size: 13px; }
  .lb-meta        { display: none; }
  .copy-section   { flex-direction: column; }
}

@media (min-width: 1400px) {
  .page           { max-width: 1300px; }
  .subjects-grid  { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
  .lb-grid        { grid-template-columns: repeat(3, 1fr); }
}

/* ── 32. Taschenrechner-Widget ──────────── */
.calc-widget {
  position: fixed; bottom: 24px; right: 24px; z-index: 200;
  display: flex; flex-direction: column; align-items: flex-end; gap: 8px;
}
.calc-toggle-btn {
  background: var(--accent); color: #fff; border: none;
  padding: 10px 18px; border-radius: var(--radius);
  font-size: 14px; font-weight: 600; cursor: pointer;
  box-shadow: 0 4px 14px rgba(99,102,241,0.4);
  transition: background var(--transition), box-shadow var(--transition);
}
.calc-toggle-btn:hover { background: #4f46e5; }
.calc-panel {
  display: none;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.18); width: 244px;
}
.calc-display {
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 10px 12px;
  margin-bottom: 10px; min-height: 58px;
  display: flex; flex-direction: column; align-items: flex-end; justify-content: center;
}
.calc-expr-disp {
  font-size: 20px; font-weight: 700; font-family: 'Courier New', monospace;
  color: var(--text); word-break: break-all; text-align: right;
}
.calc-result-disp {
  font-size: 13px; color: var(--text-muted); margin-top: 2px; min-height: 16px;
}
.calc-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px;
}
.calc-btn {
  padding: 11px 4px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-input); color: var(--text); font-size: 15px; font-weight: 600;
  cursor: pointer; transition: background var(--transition); user-select: none;
}
.calc-btn:hover  { background: var(--border); }
.calc-btn:active { transform: scale(0.94); }
.calc-btn.calc-op    { color: var(--accent); }
.calc-btn.calc-fn    { color: #10b981; font-size: 13px; }
.calc-btn.calc-eq    { background: var(--accent); color: #fff; border-color: var(--accent); }
.calc-btn.calc-eq:hover { background: #4f46e5; }
.calc-btn.calc-clear { color: #ef4444; }
.calc-btn.calc-zero  { grid-column: span 2; }

@media (max-width: 480px) {
  .calc-widget { bottom: 16px; right: 16px; }
  .calc-panel  { width: 220px; }
  .calc-btn    { padding: 9px 4px; font-size: 14px; }
}