/* ===========================
   CSS Variables & Theme
   =========================== */
:root {
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --max-width: 860px;
  --radius: 10px;
  --radius-sm: 6px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1c1422;
  --bg-secondary: #241c2e;
  --bg-tertiary: #2d2438;
  --bg-card: #241c2e;
  --border: #3d3248;
  --text: #f7f4fa;
  --text-secondary: #b8afc4;
  --text-muted: #8a7f96;
  --accent: #f1de71;
  --accent-hover: #f5e898;
  --accent-bg: rgba(241, 222, 113, 0.1);
  --green: #71f19e;
  --yellow: #f1de71;
  --red: #f171c4;
  --orange: #f1a871;
  --highlight: #f1de71;
  --terminal-bg: #1c1422;
  --code-bg: #241c2e;
  --callout-info-bg: rgba(113, 196, 241, 0.08);
  --callout-info-border: #71c4f1;
  --callout-tip-bg: rgba(113, 241, 158, 0.08);
  --callout-tip-border: #71f19e;
  --callout-warning-bg: rgba(241, 222, 113, 0.08);
  --callout-warning-border: #c4b44e;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f4fa;
  --bg-secondary: #eee9f3;
  --bg-tertiary: #e4dded;
  --bg-card: #ffffff;
  --border: rgba(28, 20, 34, 0.12);
  --text: #1c1422;
  --text-secondary: #4a3d58;
  --text-muted: #7a6e88;
  --accent: #1c1422;
  --accent-hover: #2d2438;
  --accent-bg: rgba(28, 20, 34, 0.06);
  --green: #2d9f5a;
  --yellow: #c4a91a;
  --red: #c4418a;
  --orange: #bc4c00;
  --highlight: #f1de71;
  --terminal-bg: #1c1422;
  --code-bg: #eee9f3;
  --callout-info-bg: rgba(113, 132, 241, 0.06);
  --callout-info-border: #7184f1;
  --callout-tip-bg: rgba(45, 159, 90, 0.06);
  --callout-tip-border: #2d9f5a;
  --callout-warning-bg: rgba(241, 222, 113, 0.10);
  --callout-warning-border: #c4a91a;
  --shadow: 0 1px 3px rgba(28, 20, 34, 0.08);
  --shadow-lg: 0 8px 30px rgba(28, 20, 34, 0.08);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

[data-theme="light"] .logo-icon {
  color: #f1de71;
}

[data-theme="light"] .progress-bar {
  background: #f1de71;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

img {
  max-width: 100%;
}

/* ===========================
   Layout
   =========================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===========================
   Progress Bar
   =========================== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent);
  z-index: 1000;
  transition: width 0.1s linear;
  width: 0%;
}

/* ===========================
   Header
   =========================== */
.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo:hover {
  color: var(--accent);
}

.logo-icon {
  color: var(--accent);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text);
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

[data-theme="dark"] .theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: inline; }
[data-theme="light"] .theme-icon-light { display: none; }
[data-theme="light"] .theme-icon-dark { display: inline; }

/* ===========================
   Hero
   =========================== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-accent {
  color: var(--accent);
}

[data-theme="light"] .hero-accent {
  color: #1c1422;
  background: linear-gradient(180deg, transparent 60%, rgba(241, 222, 113, 0.4) 60%);
  display: inline;
}

[data-theme="light"] .hero-badge {
  color: #1c1422;
  background: rgba(241, 222, 113, 0.3);
}

[data-theme="light"] .step-number {
  background: rgba(241, 222, 113, 0.3);
  color: #1c1422;
  border-color: rgba(241, 222, 113, 0.6);
}

[data-theme="light"] .flow-number {
  background: #1c1422;
  color: #f7f4fa;
}

[data-theme="light"] .badge-skill {
  background: rgba(241, 222, 113, 0.2);
  color: #1c1422;
}

[data-theme="light"] .anatomy-root {
  background: rgba(241, 222, 113, 0.12);
  border-color: rgba(241, 222, 113, 0.6);
}

[data-theme="light"] .anatomy-root .anatomy-label {
  color: #1c1422;
}

[data-theme="light"] .academy-card {
  background: linear-gradient(135deg, rgba(241, 222, 113, 0.12), var(--bg-secondary));
  border-color: rgba(28, 20, 34, 0.15);
}

[data-theme="light"] .academy-badge {
  background: #1c1422;
  color: #f7f4fa;
  border-color: #1c1422;
}

[data-theme="light"] .academy-features li::before {
  color: #1c1422;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.hero-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
}

[data-theme="light"] .btn-primary {
  background: #1c1422;
  color: #f7f4fa;
}

[data-theme="light"] .btn-primary:hover {
  background: #2d2438;
  color: #f7f4fa;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===========================
   Section Nav (sticky)
   =========================== */
.section-nav {
  position: sticky;
  top: 56px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  z-index: 90;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.section-nav-inner {
  display: flex;
  gap: 0;
  min-width: max-content;
  padding: 0;
}

.section-nav-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.section-nav-item:hover {
  color: var(--text-secondary);
}

.section-nav-item.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-number {
  font-weight: 700;
  font-size: 0.7rem;
  opacity: 0.5;
}

/* ===========================
   Content Sections
   =========================== */
.content-section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
}

.section-header {
  margin-bottom: 32px;
}

.section-number {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-header h2 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

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

.section-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text);
}

.section-body h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.section-body li {
  margin-bottom: 6px;
}

/* ===========================
   Info Cards
   =========================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.info-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.info-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 8px !important;
  color: var(--text) !important;
}

.info-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ===========================
   Callouts
   =========================== */
.callout {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin: 20px 0;
  font-size: 0.925rem;
  border-left: 3px solid;
}

.callout p {
  margin-bottom: 0 !important;
  color: var(--text) !important;
}

.callout-info {
  background: var(--callout-info-bg);
  border-color: var(--callout-info-border);
}

.callout-tip {
  background: var(--callout-tip-bg);
  border-color: var(--callout-tip-border);
}

.callout-warning {
  background: var(--callout-warning-bg);
  border-color: var(--callout-warning-border);
}

/* ===========================
   Concept Blocks (Collapsible)
   =========================== */
.concept-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.concept-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border: none;
  cursor: pointer;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  transition: background var(--transition);
}

.concept-toggle:hover {
  background: var(--bg-tertiary);
}

.concept-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.concept-icon {
  font-size: 1.2rem;
}

.toggle-icon {
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.concept-content {
  display: none;
  padding: 20px;
  border-top: 1px solid var(--border);
}

.concept-content.expanded {
  display: block;
}

/* ===========================
   Terminal
   =========================== */
.terminal {
  border-radius: var(--radius);
  overflow: hidden;
  margin: 16px 0;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.terminal-header {
  background: #2d333b;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal-dot.red { background: #f85149; }
.terminal-dot.yellow { background: #d29922; }
.terminal-dot.green { background: #3fb950; }

.terminal-title {
  font-size: 0.75rem;
  color: #8b949e;
  margin-left: 8px;
  font-family: var(--font-mono);
}

.terminal-body {
  background: var(--terminal-bg);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
}

[data-theme="light"] .terminal-body {
  background: #24292e;
}

.terminal-line {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.terminal-prompt {
  color: var(--green);
  user-select: none;
  flex-shrink: 0;
}

.terminal-command {
  color: #e6edf3;
}

.terminal-comment {
  color: #6e7681;
  font-size: 0.8rem;
}

.terminal-output {
  color: #8b949e;
  padding-left: 18px;
}

/* ===========================
   Key Terms
   =========================== */
.key-terms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.term {
  background: var(--bg-secondary);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.term strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 2px;
  color: var(--text);
}

.term span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===========================
   Tabs
   =========================== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
  margin-top: 16px;
}

.tab-btn {
  padding: 10px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  font-family: var(--font);
  transition: all var(--transition);
}

.tab-btn:hover {
  color: var(--text-secondary);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-content {
  display: none;
  padding-top: 16px;
}

.tab-content.active {
  display: block;
}

/* ===========================
   Code Blocks
   =========================== */
.code-block {
  position: relative;
  margin: 12px 0;
}

.code-block pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.7;
}

.code-block code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: var(--text);
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font);
  transition: all var(--transition);
  opacity: 0;
}

.code-block:hover .copy-btn {
  opacity: 1;
}

.copy-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

[data-theme="light"] .copy-btn:hover {
  background: #1c1422;
  color: #f7f4fa;
  border-color: #1c1422;
}

.copy-btn.copied {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
}

/* ===========================
   Rendered Markdown Preview
   =========================== */
.rendered-markdown {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.rendered-markdown h3,
.rendered-markdown h4 {
  margin-bottom: 8px;
}

.rendered-markdown pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: 4px;
  margin: 8px 0;
}

.rendered-markdown table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0;
}

.rendered-markdown th,
.rendered-markdown td {
  border: 1px solid var(--border);
  padding: 6px 12px;
  text-align: left;
  font-size: 0.9rem;
}

.rendered-markdown th {
  background: var(--bg-tertiary);
}

/* ===========================
   Steps
   =========================== */
.steps {
  margin: 20px 0;
}

.step {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--accent-bg);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  border: 1px solid var(--accent);
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h3,
.step-content h4 {
  margin-top: 0 !important;
  margin-bottom: 8px !important;
}

/* ===========================
   File Explorer
   =========================== */
.file-explorer {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.file-item {
  border-bottom: 1px solid var(--border);
}

.file-item:last-child {
  border-bottom: none;
}

.file-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--text);
  transition: background var(--transition);
}

.file-toggle:hover {
  background: var(--bg-secondary);
}

.file-icon {
  font-size: 1.1rem;
}

.file-name {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.file-badge {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-important {
  background: rgba(248, 81, 73, 0.15);
  color: var(--red);
}

.badge-skill {
  background: var(--accent-bg);
  color: var(--accent);
}

.badge-info {
  background: rgba(63, 185, 80, 0.15);
  color: var(--green);
}

.file-details {
  display: none;
  padding: 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.file-details.expanded {
  display: block;
}

.file-details p {
  margin-bottom: 12px;
}

.file-details ul {
  margin-bottom: 12px;
  padding-left: 20px;
}

/* Tree View */
.tree-view pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text-secondary);
}

/* ===========================
   Skill Anatomy Diagram
   =========================== */
.skill-anatomy {
  margin: 24px 0;
}

.anatomy-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 16px 0;
}

.anatomy-box {
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--border);
  width: 100%;
  max-width: 400px;
}

.anatomy-box code {
  font-size: 0.9rem;
  display: block;
}

.anatomy-box small {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.anatomy-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.anatomy-root {
  background: var(--accent-bg);
  border-color: var(--accent);
}

.anatomy-root .anatomy-label {
  color: var(--accent);
}

.anatomy-required {
  background: rgba(248, 81, 73, 0.08);
  border-color: var(--red);
}

.anatomy-required .anatomy-label {
  color: var(--red);
}

.anatomy-optional {
  background: var(--bg-secondary);
}

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

.anatomy-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
}

.anatomy-children {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
  width: 100%;
}

/* ===========================
   Flow Diagram
   =========================== */
.flow-diagram {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 20px 0;
  overflow-x: auto;
  padding-bottom: 8px;
}

.flow-step {
  flex: 1;
  min-width: 140px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
}

.flow-number {
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: var(--bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  margin: 0 auto 8px;
}

.flow-step p {
  font-size: 0.85rem;
  margin-bottom: 0 !important;
}

.flow-connector {
  color: var(--text-muted);
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* ===========================
   Data Table
   =========================== */
.table-responsive {
  overflow-x: auto;
  margin: 16px 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.data-table td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.data-table code {
  font-size: 0.8rem;
}

/* ===========================
   Quick Reference
   =========================== */
.quick-ref {
  background: var(--bg-secondary);
}

.quick-ref h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.ref-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow: hidden;
}

.ref-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}

.ref-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ref-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.ref-item code {
  font-size: 0.8rem;
  white-space: nowrap;
}

.ref-item span {
  color: var(--text-secondary);
}

/* ===========================
   Footer CTA
   =========================== */
.footer-cta {
  padding: 64px 0;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.footer-cta h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.footer-cta p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 1.05rem;
}

/* ===========================
   Footer
   =========================== */
.site-footer {
  padding: 24px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

.footer-right {
  display: flex;
  gap: 16px;
}

.footer-right a {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.footer-right a:hover {
  color: var(--accent);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 40px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .section-header h2 {
    font-size: 1.4rem;
  }

  .content-section {
    padding: 40px 0;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .flow-diagram {
    flex-direction: column;
  }

  .flow-connector {
    transform: rotate(90deg);
  }

  .anatomy-children {
    grid-template-columns: 1fr;
  }

  .header-nav .nav-link {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .step {
    flex-direction: column;
    gap: 10px;
  }

  .ref-grid {
    grid-template-columns: 1fr;
  }

  .key-terms {
    grid-template-columns: 1fr;
  }
}

/* ===========================
   MIA Academy CTA
   =========================== */
.mia-academy-cta {
  border-bottom: 1px solid var(--border);
}

.academy-card {
  background: linear-gradient(135deg, var(--accent-bg), var(--bg-secondary));
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}

.academy-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--bg);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  border: 1px solid var(--accent);
}

.academy-card h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.academy-card p {
  color: var(--text-secondary);
  margin-bottom: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.academy-description {
  font-size: 1.05rem;
  line-height: 1.6;
}

.academy-features {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 24px;
  margin: 20px 0 28px;
}

.academy-features li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 18px;
}

.academy-features li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

@media (max-width: 768px) {
  .academy-card {
    padding: 28px 20px;
  }

  .academy-features {
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .section-nav-item {
    padding: 10px 12px;
    font-size: 0.75rem;
  }
}