@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600;9..40,700&family=Source+Serif+4:opsz,wght@8..60,700;8..60,800&display=swap');

/* ===== RESET & TOKENS ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --navy: #0f1b2d;
  --blue: #1a56db;
  --blue-light: #3b82f6;
  --blue-bg: #eff6ff;
  --blue-border: #bfdbfe;
  --green: #059669;
  --green-bg: #ecfdf5;
  --green-border: #a7f3d0;
  --amber: #d97706;
  --amber-bg: #fffbeb;
  --amber-border: #fde68a;
  --red: #dc2626;
  --bg: #ffffff;
  --bg-off: #f8fafc;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --font: 'DM Sans', -apple-system, sans-serif;
  --font-display: 'Source Serif 4', Georgia, serif;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg-off); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ===== TOP BAR ===== */
.topbar {
  background: var(--navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 52px;
  position: sticky;
  top: 0;
  z-index: 200;
}
.topbar-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.02em;
  margin-right: auto;
}
.topbar-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.75);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 10px;
  margin-right: 14px;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}
.topbar-back:hover { background: rgba(255,255,255,0.08); color: #fff; }
.topbar-back-label { display: inline; }
@media (max-width: 640px) { .topbar-back-label { display: none; } }
.topbar-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.6);
}
.topbar-progress .bar-track {
  width: 120px;
  height: 4px;
  background: rgba(255,255,255,0.15);
  border-radius: 4px;
  overflow: hidden;
}
.topbar-progress .bar-fill {
  height: 100%;
  background: #34d399;
  border-radius: 4px;
  transition: width 0.4s;
}
.topbar-hamburger {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  padding: 4px;
}

/* ===== LAYOUT ===== */
.app { display: flex; min-height: calc(100vh - 52px); }

/* ===== SIDEBAR ===== */
.sidebar {
  width: 280px;
  background: var(--bg);
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  overflow-y: auto;
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
}
.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border-light);
}
.sidebar-header h2 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 4px;
}
.sidebar-header p { font-size: 12px; color: var(--text-muted); }
.module-group {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
}
.module-group-label {
  padding: 0 20px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.module-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}
.module-item:hover { background: var(--bg-off); color: var(--text); }
.module-item.active { background: var(--blue-bg); color: var(--blue); font-weight: 600; }
.module-item.locked { color: var(--text-muted); cursor: default; }
.module-item.locked:hover { background: transparent; color: var(--text-muted); }
.module-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
}
.module-item.active .module-dot { border-color: var(--blue); background: var(--blue); color: #fff; }
.module-item.completed .module-dot { border-color: var(--green); background: var(--green); color: #fff; }

/* ===== MAIN CONTENT ===== */
.main {
  flex: 1;
  min-width: 0;
  padding: 32px 40px 60px;
  max-width: 800px;
}

/* Module badge */
.lesson-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.lesson-badge .num {
  background: var(--blue);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
}
.lesson-badge .label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Lesson title */
.lesson-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 8px;
}
.lesson-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.lesson-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== LESSON CARDS ===== */
.lesson-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.lesson-card h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.lesson-card h2 .card-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}
.lesson-card p { color: var(--text-secondary); font-size: 14.5px; line-height: 1.7; }
.lesson-card p + p { margin-top: 10px; }
.lesson-card p strong { color: var(--text); font-weight: 600; }

/* Callout */
.callout {
  background: var(--bg-off);
  border-left: 3px solid var(--blue);
  padding: 14px 16px;
  border-radius: 0 8px 8px 0;
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.callout strong { color: var(--text); }
.callout.warning { border-left-color: var(--amber); }
.callout.success { border-left-color: var(--green); }

/* ===== MODEL CARDS ===== */
.model-grid { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 16px; }
.model-row {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: var(--bg-off);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  transition: border-color 0.2s;
}
.model-row:hover { border-color: var(--border); }
.model-tag {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  flex-shrink: 0;
}
.model-tag.blue { background: var(--blue-bg); color: var(--blue); }
.model-tag.green { background: var(--green-bg); color: var(--green); }
.model-tag.amber { background: var(--amber-bg); color: var(--amber); }
.model-tag.navy { background: #e2e8f0; color: var(--navy); }
.model-tag.w2 { background: var(--blue-bg); color: var(--blue); }
.model-tag.ic { background: var(--green-bg); color: var(--green); }
.model-tag.biz { background: var(--amber-bg); color: var(--amber); }
.model-info h3 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 3px; }
.model-info p { font-size: 13px; line-height: 1.5; color: var(--text-secondary); }
.model-info .model-traits { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.trait {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* ===== ASSESSMENT / TOGGLE ===== */
.assessment-list { margin-top: 14px; }
.assessment-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 14px;
  color: var(--text);
  gap: 16px;
}
.assessment-row:last-child { border-bottom: none; }
.toggle-group { display: flex; gap: 4px; flex-shrink: 0; }
.toggle-btn {
  padding: 5px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--text-muted);
  font-family: var(--font);
}
.toggle-btn:hover { border-color: var(--blue-border); }
.toggle-btn.active-yes { background: var(--green-bg); border-color: var(--green-border); color: var(--green); }
.toggle-btn.active-no { background: #fef2f2; border-color: #fecaca; color: var(--red); }
.assessment-result {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  display: none;
}
.assessment-result.show { display: block; }
.assessment-result.good { background: var(--green-bg); color: var(--green); border: 1px solid var(--green-border); }
.assessment-result.warn { background: var(--amber-bg); color: var(--amber); border: 1px solid var(--amber-border); }

/* ===== INTERACTIVE CHECKLIST ===== */
.checklist { margin-top: 14px; }
.checklist-group-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blue);
  margin: 16px 0 6px;
  padding-left: 4px;
}
.checklist-group-label:first-child { margin-top: 0; }
.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 13.5px;
  color: var(--text);
  cursor: pointer;
  transition: color 0.15s;
  line-height: 1.5;
  user-select: none;
}
.checklist-item:last-child { border-bottom: none; }
.checklist-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 4px;
  flex-shrink: 0;
  cursor: pointer;
  position: relative;
  margin-top: 1px;
  transition: all 0.15s;
}
.checklist-item input[type="checkbox"]:checked {
  background: var(--green);
  border-color: var(--green);
}
.checklist-item input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}
.checklist-item.done { color: var(--text-muted); }
.checklist-item.done span { text-decoration: line-through; }

/* Checklist progress bar */
.checklist-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}
.checklist-progress .bar-track {
  flex: 1;
  height: 6px;
  background: var(--border-light);
  border-radius: 6px;
  overflow: hidden;
}
.checklist-progress .bar-fill {
  height: 100%;
  background: var(--green);
  border-radius: 6px;
  transition: width 0.3s;
}

/* ===== SCRIPT / TEMPLATE BLOCKS ===== */
.script-block {
  background: var(--navy);
  color: #e2e8f0;
  padding: 20px 24px;
  border-radius: 10px;
  font-family: 'DM Sans', monospace;
  font-size: 13.5px;
  line-height: 1.7;
  margin-top: 16px;
  position: relative;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.script-block .speaker {
  color: var(--blue-light);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: block;
  margin-top: 12px;
}
.script-block .speaker:first-child { margin-top: 0; }
.script-block .note {
  color: var(--text-muted);
  font-style: italic;
  font-size: 12px;
}

/* ===== COPY BUTTON ===== */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.15s;
}
.copy-btn:hover { border-color: var(--blue-border); color: var(--blue); }
.copy-btn.copied { border-color: var(--green-border); color: var(--green); background: var(--green-bg); }
.script-block .copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.6);
}
.script-block .copy-btn:hover { background: rgba(255,255,255,0.15); color: #fff; }
.script-block .copy-btn.copied { background: rgba(5,150,105,0.2); border-color: var(--green); color: var(--green); }

/* ===== CALCULATOR ===== */
.calc-card {
  background: var(--bg-off);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-top: 16px;
}
.calc-section-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 14px 0 8px;
}
.calc-section-label:first-child { margin-top: 0; }
.calc-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.calc-row label {
  flex: 1;
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
}
.calc-input {
  width: 120px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--text);
  text-align: right;
  background: var(--bg);
  transition: border-color 0.2s;
}
.calc-input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(26,86,219,0.1); }
.calc-unit {
  font-size: 12px;
  color: var(--text-muted);
  min-width: 40px;
}
.calc-outputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 16px;
}
.calc-output-cell {
  padding: 14px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border-light);
  text-align: center;
}
.calc-output-cell .calc-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.calc-output-cell .calc-value {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--navy);
}
.calc-output-cell.good { background: var(--green-bg); border-color: var(--green-border); }
.calc-output-cell.good .calc-value { color: var(--green); }
.calc-output-cell.warn { background: var(--amber-bg); border-color: var(--amber-border); }
.calc-output-cell.warn .calc-value { color: var(--amber); }
.calc-output-cell.bad { background: #fef2f2; border-color: #fecaca; }
.calc-output-cell.bad .calc-value { color: var(--red); }

/* ===== ASSET BLOCK ===== */
.asset-block {
  background: var(--bg-off);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-top: 16px;
}
.asset-block h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.asset-block .asset-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.asset-block pre {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: 'DM Sans', sans-serif;
  max-height: 400px;
  overflow-y: auto;
}
.asset-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

/* ===== JOB LINK ===== */
.job-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-off);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--text);
  font-weight: 600;
  transition: all 0.15s;
  margin-bottom: 6px;
  text-decoration: none;
}
.job-link:hover { border-color: var(--blue-border); background: var(--blue-bg); color: var(--blue); }
.job-link .arrow { color: var(--text-muted); font-size: 16px; }
.job-link:hover .arrow { color: var(--blue); }
.job-link .job-meta {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
}

/* ===== DATA TABLE ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 13px;
}
.data-table th {
  text-align: left;
  padding: 10px 12px;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}
.data-table td strong { color: var(--text); font-weight: 600; }
.data-table .highlight { color: var(--blue); font-weight: 700; }

/* ===== ROADMAP ===== */
.roadmap { margin-top: 16px; }
.roadmap-week { margin-bottom: 18px; }
.roadmap-week-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--blue);
  margin-bottom: 8px;
  padding-left: 4px;
}
.roadmap-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.roadmap-day {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: var(--bg-off);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--text-secondary);
  transition: border-color 0.2s;
}
.roadmap-day:hover { border-color: var(--border); }
.roadmap-day.current { border-color: var(--blue-border); background: var(--blue-bg); }
.roadmap-day .rd-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 12px;
  color: var(--navy);
  min-width: 14px;
}
.roadmap-day.current .rd-num { color: var(--blue); }
.roadmap-day .rd-title { font-weight: 600; color: var(--text); }

/* ===== DISCLAIMER CARD ===== */
.disclaimer-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 16px;
  border-left: 4px solid var(--amber);
}
.disclaimer-card h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.disclaimer-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.disclaimer-card p + p { margin-top: 6px; }

/* ===== NEXT LESSON BAR ===== */
.next-bar {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  box-shadow: var(--shadow-sm);
}
.next-bar-text { font-size: 13px; color: var(--text-muted); }
.next-bar-text strong { display: block; font-size: 15px; color: var(--text); margin-top: 2px; }
.next-btn {
  background: var(--blue);
  color: #fff;
  border: none;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
.next-btn:hover { background: #1648b8; }

/* ===== COMPLETION BANNER ===== */
.completion-banner {
  background: var(--green-bg);
  border: 2px solid var(--green-border);
  border-radius: 12px;
  padding: 28px;
  text-align: center;
  margin-top: 8px;
}
.completion-banner h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  color: var(--green);
  margin-bottom: 8px;
}
.completion-banner p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ===== FOOTER ===== */
.course-footer {
  text-align: center;
  padding: 20px 0;
  color: var(--text-muted);
  font-size: 11px;
  line-height: 1.6;
}

/* ===== SIDEBAR OVERLAY ===== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 299;
}
.sidebar-overlay.show { display: block; }

/* ===== MOBILE ===== */
@media (max-width: 860px) {
  .topbar-hamburger { display: block; }
  .sidebar {
    position: fixed;
    top: 0;
    left: -300px;
    height: 100vh;
    z-index: 300;
    transition: left 0.25s ease;
    box-shadow: var(--shadow-md);
  }
  .sidebar.open { left: 0; }
  .main { padding: 24px 20px 48px; }
  .lesson-title { font-size: 26px; }
  .roadmap-grid { grid-template-columns: 1fr; }
  .calc-outputs { grid-template-columns: 1fr; }
  .next-bar { flex-direction: column; gap: 14px; text-align: center; }
  .assessment-row { flex-direction: column; align-items: flex-start; gap: 8px; }
  .model-row { flex-direction: column; gap: 8px; }
  .calc-row { flex-direction: column; align-items: flex-start; gap: 4px; }
  .calc-input { width: 100%; }
}