/* ==========================================================
   Vibe Coding with Claude Code — Enterprise Training v4
   Design System & Styles
   ========================================================== */

/* --- Design Tokens --- */
:root {
  --bg: #060b16;
  --surface: #0c1424;
  --surface-2: #111c32;
  --surface-3: #182742;
  --border: #1c2d50;
  --border-focus: #3a5d94;
  --text: #e6ecf8;
  --text-secondary: #94a8cc;
  --text-muted: #5f7498;
  --accent: #5b9cff;
  --accent-hover: #7bb4ff;
  --accent-dim: rgba(91,156,255,.10);
  --success: #34d399;
  --success-dim: rgba(52,211,153,.10);
  --warning: #fbbf24;
  --danger: #f87171;
  --danger-dim: rgba(248,113,113,.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --shadow-card: 0 4px 16px rgba(0,0,0,.28);
  --transition: 180ms ease;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(ellipse 1200px 500px at 75% -10%, #152444 0%, transparent 60%);
  min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4 { margin: 0; line-height: 1.3; }
h1 { font-size: clamp(1.3rem, 3.5vw, 1.85rem); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.15rem; font-weight: 600; }
h3 { font-size: 1rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.04em; }
h4 { font-size: 0.92rem; font-weight: 600; margin-bottom: 6px; }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
ul { margin: 8px 0; padding-left: 20px; }
li { margin: 5px 0; line-height: 1.55; }

/* --- Header --- */
header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(12,20,36,.9), rgba(6,11,22,.95));
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}
.subtitle { color: var(--text-muted); font-size: 0.88rem; margin-top: 4px; }
.header-role { display: flex; flex-direction: column; gap: 4px; min-width: 200px; }
.header-role label { font-size: 0.78rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }

/* --- Version Badge --- */
.version-badge {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid rgba(91,156,255,.25);
  vertical-align: middle;
  margin-left: 4px;
  letter-spacing: 0.04em;
}

/* --- Progress Bar --- */
.progress-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}
.progress-bar-track {
  flex: 1;
  max-width: 600px;
  height: 10px;
  background: var(--surface-2);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  border-radius: 99px;
  transition: width 400ms ease;
}
#overallProgressText {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 36px;
}

/* --- Role Hint --- */
.role-hint {
  margin-top: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.hint-label { color: var(--text-muted); font-size: 0.82rem; }

/* --- Board / Dashboard --- */
.board {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 24px;
}
.board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}
.board-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.kpi {
  padding: 14px 16px;
  background: linear-gradient(180deg, var(--surface), #0a1220);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: border-color var(--transition);
}
.kpi:hover { border-color: var(--border-focus); }
.kpi-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.kpi strong {
  font-size: 1.2rem;
  color: var(--text);
}

/* --- Enterprise Section --- */
.enterprise-section { border-top: 1px solid var(--border); padding-top: 22px; }
.enterprise-section h3 { margin-bottom: 12px; }

/* --- Mode Filter --- */
.mode-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.btn-filter {
  background: var(--surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 6px 16px;
  font-size: 0.84rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-filter:hover { border-color: var(--border-focus); color: var(--text); }
.btn-filter.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

/* --- Case Grid --- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}
.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.case-card:hover { border-color: var(--border-focus); box-shadow: 0 2px 12px rgba(0,0,0,.2); }
.case-card.answered { border-color: rgba(52,211,153,.3); }
.case-card.empty { text-align: center; color: var(--text-muted); padding: 32px 16px; }
.case-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.case-header h4 { font-size: 0.95rem; }
.case-mode-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.mode-decision { background: rgba(251,191,36,.12); color: #fbbf24; border: 1px solid rgba(251,191,36,.25); }
.mode-debug { background: rgba(248,113,113,.10); color: #f87171; border: 1px solid rgba(248,113,113,.2); }
.mode-review { background: rgba(91,156,255,.10); color: #5b9cff; border: 1px solid rgba(91,156,255,.2); }
.case-question {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 10px;
  line-height: 1.5;
}
.case-actions { display: flex; flex-wrap: wrap; gap: 6px; }
.case-result {
  font-size: 0.88rem;
  margin-top: 10px;
  line-height: 1.5;
  min-height: 1.5em;
}
.case-result.correct { color: var(--success); }
.case-result.wrong { color: var(--danger); }

/* --- Template Box --- */
.template-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
}
.template-box h4 { color: var(--text-secondary); margin-bottom: 10px; }
.template-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}
.copy-msg {
  font-size: 0.84rem;
  color: var(--success);
  opacity: 0;
  transition: opacity var(--transition);
}
.copy-msg.show { opacity: 1; }
pre {
  white-space: pre-wrap;
  background: #080e1c;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
  color: #c4d6f0;
  font-family: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
  font-size: 0.84rem;
  line-height: 1.55;
  max-height: 300px;
  overflow: auto;
  margin: 0;
}

/* --- Main Layout --- */
main {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 40px;
}

/* --- Sidebar --- */
aside {
  position: sticky;
  top: 120px;
  height: fit-content;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
}
aside h3 { margin-bottom: 10px; font-size: 0.82rem; }
aside ul { list-style: none; padding: 0; margin: 0; }
aside li {
  display: flex;
  align-items: center;
  gap: 0;
  margin: 0;
  position: relative;
}
aside li a {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.84rem;
  padding: 7px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  flex: 1;
  min-width: 0;
}
aside li a:hover { color: var(--text); background: var(--surface-2); }
.toc-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--surface-2);
  border-radius: 4px;
  flex-shrink: 0;
}
.toc-status {
  width: 16px;
  font-size: 0.78rem;
  text-align: center;
  flex-shrink: 0;
  color: transparent;
}
.toc-status.complete { color: var(--success); font-weight: 700; }
.rec-badge {
  font-size: 0.62rem;
  padding: 1px 6px;
  border-radius: 99px;
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
  margin-left: auto;
  flex-shrink: 0;
  white-space: nowrap;
  animation: rec-pulse 2s ease-in-out infinite;
}
@keyframes rec-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* --- Content --- */
#content { display: grid; gap: 16px; }

/* --- Chapter Card --- */
.card {
  background: linear-gradient(180deg, var(--surface), #0a1220);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 20px 22px;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover { border-color: var(--border-focus); }
.card.done { border-color: rgba(52,211,153,.35); box-shadow: 0 0 20px rgba(52,211,153,.06); }
.card-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 6px;
}
.chapter-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 800;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  border: 1px solid rgba(91,156,255,.15);
}
.card .summary {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 4px;
}

/* --- Details / Expand --- */
details {
  margin: 10px 0 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
details > summary {
  padding: 10px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  background: var(--surface-2);
  transition: background var(--transition);
  list-style: none;
}
details > summary::-webkit-details-marker { display: none; }
details > summary::before {
  content: "\25b8 ";
  color: var(--text-muted);
  transition: transform var(--transition);
  display: inline-block;
}
details[open] > summary::before { content: "\25be "; }
details > summary:hover { background: var(--surface-3); }
details > ul, details > div { padding: 12px 16px; }
details li { color: var(--text-secondary); font-size: 0.88rem; }
.practice-details > summary { color: var(--accent); }
.practice-details li { color: var(--accent); opacity: 0.85; }

/* --- Exercise (Done checkbox) --- */
.exercise {
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.exercise.checked {
  border-color: rgba(52,211,153,.3);
  background: var(--success-dim);
}
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.9rem;
}
.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--success);
  cursor: pointer;
}

/* --- Quiz --- */
.quiz {
  margin-top: 12px;
  padding: 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.quiz .q {
  font-size: 0.92rem;
  color: var(--text);
  margin-bottom: 10px;
  font-weight: 500;
}
.quiz .options { display: flex; flex-direction: column; gap: 6px; }
.btn-quiz {
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 0.88rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition);
  width: 100%;
}
.btn-quiz:hover { border-color: var(--accent); color: var(--text); background: var(--accent-dim); }
.btn-quiz:active { transform: scale(0.98); }
.quiz-result {
  font-size: 0.88rem;
  margin-top: 10px;
  font-weight: 600;
  min-height: 1.4em;
}
.quiz-result.correct { color: var(--success); }
.quiz-result.wrong { color: var(--danger); }

/* --- Submission --- */
.submission {
  margin-top: 12px;
  padding: 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.submission-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.submission-url {
  width: 100%;
  padding: 10px 12px;
  background: #080e1c;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  outline: none;
  transition: border-color var(--transition);
}
.submission-url:focus { border-color: var(--accent); }
.submission-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}
.open-link {
  font-size: 0.84rem;
  color: var(--accent);
}
.submission-status {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 6px;
}
.submission-status.saved { color: var(--success); }
.submission-status.error { color: var(--danger); }

/* --- Buttons --- */
button {
  font-family: inherit;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 18px;
  font-weight: 600;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.97); }
.btn-secondary {
  background: var(--surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }
.btn-option {
  background: var(--surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  font-size: 0.84rem;
}
.btn-option:hover { border-color: var(--accent); color: var(--text); }
.btn-option:active { transform: scale(0.97); }
.btn-danger {
  background: var(--danger-dim);
  color: var(--danger);
  border: 1px solid rgba(248,113,113,.2);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  width: 100%;
  margin-top: 14px;
}
.btn-danger:hover { border-color: var(--danger); }

/* --- Select --- */
select {
  width: 100%;
  padding: 9px 12px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition);
}
select:focus { border-color: var(--accent); }

/* --- Tag --- */
.tag {
  display: inline-block;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.72rem;
  margin: 2px 2px;
}

/* --- kbd --- */
kbd {
  display: inline-block;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: 'JetBrains Mono', 'SF Mono', monospace;
  font-size: 0.78rem;
  color: var(--text);
  margin-right: 4px;
}

/* --- Toast --- */
#toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast-item {
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  transform: translateX(120%);
  opacity: 0;
  transition: all 280ms ease;
  pointer-events: auto;
}
.toast-item.show { transform: translateX(0); opacity: 1; }
.toast-info { background: var(--surface-3); color: var(--text); border: 1px solid var(--border-focus); }
.toast-success { background: #0a2a1a; color: var(--success); border: 1px solid rgba(52,211,153,.3); }
.toast-error { background: #2a0a0a; color: var(--danger); border: 1px solid rgba(248,113,113,.3); }

/* --- Appendix Section --- */
.appendix-section {
  border-top: 1px solid var(--border);
  padding-top: 22px;
  padding-bottom: 8px;
}
.appendix-section h3 { margin-bottom: 14px; }
.appendix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.appendix-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: border-color var(--transition);
}
.appendix-card:hover { border-color: var(--border-focus); }
.appendix-card h4 {
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-size: 0.88rem;
}
.appendix-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.appendix-card li {
  font-size: 0.84rem;
  color: var(--text-secondary);
  padding: 4px 0;
  border-bottom: 1px solid rgba(28,45,80,.4);
  line-height: 1.6;
}
.appendix-card li:last-child { border-bottom: none; }

/* --- Footer --- */
footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 32px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  border-top: 1px solid var(--border);
}

/* --- Responsive --- */
@media (max-width: 960px) {
  main { grid-template-columns: 1fr; }
  aside { position: static; }
  .board-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .appendix-grid { grid-template-columns: 1fr; }
  .header-top { flex-direction: column; }
  .header-role { min-width: 100%; }
}
@media (max-width: 580px) {
  .board-grid { grid-template-columns: 1fr; }
  header { padding: 16px; }
  .board { padding: 14px 16px; }
  main { padding: 14px 16px 32px; }
  .card { padding: 16px; }
  .appendix-card { padding: 12px; }
  .btn-option { padding: 10px 14px; font-size: 0.88rem; }
  .btn-quiz { padding: 12px 14px; }
}