/* MacroZone Learning Course — Shared Stylesheet */
/* Every lesson links this file for consistent look & feel */

:root {
  --bg-primary: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-code: #16213e;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b0;
  --text-muted: #6a6a7a;
  --accent: #4fc3f7;
  --accent-hover: #81d4fa;
  --success: #66bb6a;
  --warning: #ffa726;
  --danger: #ef5350;
  --border: #2a2a3e;
  --radius: 8px;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  font-size: 16px;
}

/* ── Typography ─────────────────────────────── */

h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--accent);
}

h1 .lesson-number {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
  display: block;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  color: var(--accent);
}

p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

a:hover {
  border-bottom-color: var(--accent);
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ── Code ───────────────────────────────────── */

code {
  font-family: var(--font-mono);
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent);
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 24px;
  position: relative;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.88em;
  line-height: 1.6;
  color: var(--text-primary);
}

.code-filename {
  font-family: var(--font-mono);
  font-size: 0.78em;
  color: var(--text-muted);
  background: var(--border);
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius) var(--radius) 0 0;
  margin-bottom: -1px;
}

/* ── Cards / Callouts ───────────────────────── */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}

.callout {
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  margin-bottom: 24px;
  background: var(--bg-card);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.callout.tip    { border-left-color: var(--success); }
.callout.warn   { border-left-color: var(--warning); }
.callout.danger { border-left-color: var(--danger); }

.callout-label {
  font-weight: 600;
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.callout.tip .callout-label    { color: var(--success); }
.callout.warn .callout-label   { color: var(--warning); }
.callout.danger .callout-label { color: var(--danger); }

/* ── Key Concept Box ────────────────────────── */

.key-concept {
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px;
  margin: 24px 0;
}

.key-concept h3 {
  margin-top: 0;
  font-size: 1rem;
}

/* ── Lists ──────────────────────────────────── */

ul, ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-secondary);
}

li {
  margin-bottom: 8px;
}

li code {
  font-size: 0.88em;
}

/* ── Tables ─────────────────────────────────── */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 0.95em;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 1px;
}

td {
  color: var(--text-secondary);
}

td code {
  font-size: 0.85em;
}

/* ── Quiz Widget ────────────────────────────── */

.quiz {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

.quiz h3 {
  margin-top: 0;
  color: var(--text-primary);
}

.quiz-option {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.95em;
  cursor: pointer;
  transition: all 0.2s;
}

.quiz-option:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.quiz-option.correct {
  border-color: var(--success);
  background: #1b3a1b;
  color: var(--success);
}

.quiz-option.wrong {
  border-color: var(--danger);
  background: #3a1b1b;
  color: var(--danger);
}

.quiz-option:disabled {
  cursor: default;
  opacity: 0.7;
}

.quiz-feedback {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: var(--radius);
  display: none;
  font-size: 0.95em;
}

.quiz-feedback.show { display: block; }
.quiz-feedback.correct { background: #1b3a1b; color: var(--success); }
.quiz-feedback.wrong   { background: #3a1b1b; color: var(--danger);  }

/* ── Navigation / Footer ────────────────────── */

.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.lesson-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9em;
  transition: all 0.2s;
}

.lesson-nav a:hover {
  border-color: var(--accent);
  background: var(--bg-card);
}

.ask-teacher {
  text-align: center;
  margin-top: 32px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
}

.ask-teacher p {
  color: var(--text-muted);
  font-size: 0.9em;
  margin: 0;
}

/* ── Live Teacher Components ────────────────── */

.teacher-voice {
  background: linear-gradient(135deg, rgba(79, 195, 247, 0.08), rgba(99, 102, 241, 0.08));
  border: 1px solid rgba(79, 195, 247, 0.3);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 24px 0;
  position: relative;
}

.teacher-voice::before {
  content: "👨‍🏫 Live Instructor Note";
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 8px;
}

/* ── Visual Diagrams & Architecture Components ── */

.diagram-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 24px 0;
}

.diagram-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Flow Pipeline */
.flow-pipeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.flow-step {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.flow-step-num {
  background: var(--accent);
  color: #0f0f1a;
  font-weight: 800;
  font-size: 0.85rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.flow-step-content h4 {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.flow-step-content p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0;
}

.flow-arrow {
  text-align: center;
  color: var(--accent);
  font-size: 1.2rem;
  line-height: 1;
}

.flow-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.flow-split-box {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  text-align: center;
}

.flow-split-box.ios {
  border-top: 3px solid #38bdf8;
}

.flow-split-box.android {
  border-top: 3px solid #4ade80;
}

.flow-split-box h5 {
  font-size: 0.9rem;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.flow-split-box code {
  font-size: 0.8rem;
  display: block;
  margin-top: 4px;
}

/* Side-by-Side Flex Comparison */
.flex-compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0;
}

.compare-card {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.compare-header {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.compare-header .tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(79, 195, 247, 0.15);
  color: var(--accent);
  font-family: var(--font-mono);
}

.preview-box {
  background: #0d1117;
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 12px;
  min-height: 140px;
  display: flex;
  margin-bottom: 12px;
}

.preview-box.row-layout {
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
}

.preview-box.col-layout {
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 8px;
}

.mock-item {
  background: #238636;
  color: #ffffff;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
}

.mock-item.blue {
  background: #1f6feb;
}

.mock-item.purple {
  background: #8957e5;
}

.axis-info {
  background: rgba(0, 0, 0, 0.25);
  border-radius: 6px;
  padding: 10px;
  font-size: 0.8rem;
}

.axis-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
}

.axis-row:last-child {
  margin-bottom: 0;
}

.axis-label {
  color: var(--text-muted);
}

.axis-val {
  color: var(--accent);
  font-weight: 600;
}

@media (max-width: 650px) {
  .flex-compare-grid, .flow-split {
    grid-template-columns: 1fr;
  }
}

.challenge-box {
  background: linear-gradient(135deg, #1e1b4b, #0f172a);
  border: 1px solid #6366f1;
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

.challenge-box h3 {
  color: #818cf8;
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-live {
  display: inline-block;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 9999px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* ── Responsive ─────────────────────────────── */

@media (max-width: 600px) {
  body { padding: 24px 16px 60px; }
  h1 { font-size: 1.6rem; }
  pre { padding: 14px; font-size: 0.85em; }
}