/* ============================================================
   RESKILLING CURRICULUM — SHARED STYLES
   ============================================================ */
:root {
  --primary:        #2563eb;
  --primary-light:  #dbeafe;
  --primary-dark:   #1d4ed8;
  --phase-1:        #3b82f6;
  --phase-2:        #8b5cf6;
  --phase-3:        #10b981;
  --phase-4:        #f59e0b;
  --warning:        #f59e0b;
  --danger:         #ef4444;
  --success:        #10b981;
  --tip:            #06b6d4;
  --gray-50:        #f8fafc;
  --gray-100:       #f1f5f9;
  --gray-200:       #e2e8f0;
  --gray-300:       #cbd5e1;
  --gray-400:       #94a3b8;
  --gray-500:       #64748b;
  --gray-600:       #475569;
  --gray-700:       #334155;
  --gray-800:       #1e293b;
  --gray-900:       #0f172a;
  --code-bg:        #1e1e2e;
  --font-sans:      'Hiragino Sans', 'Yu Gothic UI', 'Meiryo', 'Noto Sans JP', sans-serif;
  --font-mono:      'Cascadia Code', 'Consolas', 'Source Code Pro', monospace;
  --radius:         12px;
  --shadow:         0 2px 8px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:      0 8px 24px rgba(0,0,0,.12), 0 2px 6px rgba(0,0,0,.08);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: var(--gray-100);
  color: var(--gray-800);
  line-height: 1.8;
  font-size: 15px;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  background: var(--gray-900);
  color: #e2e8f0;
  padding: 24px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar-logo {
  padding: 0 20px 20px;
  border-bottom: 1px solid #334155;
  margin-bottom: 16px;
}
.sidebar-logo .label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gray-400);
  display: block;
  margin-bottom: 4px;
}
.sidebar-logo .title {
  font-size: 13px;
  font-weight: 700;
  color: #f1f5f9;
  line-height: 1.4;
}
.sidebar-nav-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gray-500);
  padding: 8px 20px 4px;
}
.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  color: var(--gray-400);
  text-decoration: none;
  font-size: 13px;
  border-left: 3px solid transparent;
  transition: all .15s;
}
.sidebar nav a:hover,
.sidebar nav a.active {
  color: #f1f5f9;
  background: rgba(255,255,255,.05);
  border-left-color: var(--primary);
}
.sidebar nav a .badge {
  margin-left: auto;
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 20px;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content {
  max-width: 900px;
  padding: 40px 40px 80px;
}
@media (max-width: 700px) {
  .main-content { padding: 24px 16px 60px; }
}

/* ============================================================
   COURSE HEADER
   ============================================================ */
.course-header {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 32px 36px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.course-header::after {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,.07);
}
.course-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.3);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.course-header h1 {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 20px;
}
.course-meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
}
@media (max-width: 600px) {
  .course-meta-grid { grid-template-columns: 1fr; }
}
.course-meta-item {
  background: rgba(255,255,255,.15);
  border-radius: 8px;
  padding: 10px 14px;
}
.course-meta-item .meta-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .08em;
  opacity: .8;
  display: block;
  margin-bottom: 2px;
}
.course-meta-item .meta-value {
  font-size: 14px;
  font-weight: 600;
}
.path-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}
.path-badge.path-a { background: #10b981; color: #fff; }
.path-badge.path-b { background: #8b5cf6; color: #fff; }
.path-badge.path-opt { background: #f59e0b; color: #fff; }
.path-badge.path-common { background: rgba(255,255,255,.3); color: #fff; }

/* ============================================================
   PHASE SECTIONS
   ============================================================ */
.phase-section {
  margin-bottom: 48px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.phase-header {
  padding: 20px 28px;
  color: #fff;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.phase-1 .phase-header { background: linear-gradient(135deg, #2563eb, #3b82f6); }
.phase-2 .phase-header { background: linear-gradient(135deg, #7c3aed, #8b5cf6); }
.phase-3 .phase-header { background: linear-gradient(135deg, #059669, #10b981); }
.phase-4 .phase-header { background: linear-gradient(135deg, #d97706, #f59e0b); }

.phase-number {
  background: rgba(255,255,255,.25);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.phase-header-content h2 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 6px;
}
.phase-header-content .phase-time {
  font-size: 13px;
  opacity: .85;
}
.phase-body {
  background: #fff;
  padding: 28px;
}
.phase-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--gray-200);
}
.phase-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--gray-700);
}
.phase-meta-item .icon { font-size: 14px; }
.checklist {
  list-style: none;
  margin-top: 16px;
}
.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0;
  font-size: 13px;
  color: var(--gray-700);
}
.checklist li::before {
  content: '☐';
  font-size: 16px;
  color: var(--gray-400);
  flex-shrink: 0;
  line-height: 1.4;
}

/* ============================================================
   STEP CARDS
   ============================================================ */
.step-card {
  margin-bottom: 32px;
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  overflow: hidden;
}
.step-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}
.step-number {
  background: var(--primary);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.step-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-800);
}
.step-body {
  padding: 20px 24px;
}
.step-body p {
  margin-bottom: 14px;
  color: var(--gray-700);
}
.step-body ul, .step-body ol {
  margin: 0 0 14px 20px;
  color: var(--gray-700);
}
.step-body li { margin-bottom: 6px; }
.step-body h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-800);
  margin: 20px 0 8px;
  padding-left: 10px;
  border-left: 3px solid var(--primary);
}

/* ============================================================
   CODE BLOCKS
   ============================================================ */
pre {
  background: var(--code-bg);
  color: #cdd6f4;
  border-radius: 8px;
  padding: 16px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  margin: 12px 0 20px;
  position: relative;
}
pre .comment { color: #6272a4; }
pre .keyword { color: #ff79c6; }
pre .string  { color: #f1fa8c; }
pre .number  { color: #bd93f9; }
pre .function{ color: #50fa7b; }
pre .prompt  { color: #50fa7b; user-select: none; }
pre .output  { color: #8be9fd; }
code {
  font-family: var(--font-mono);
  font-size: .9em;
  background: var(--gray-100);
  color: #c0392b;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--gray-200);
}
pre code { background: none; color: inherit; padding: 0; border: none; }
.code-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #161622;
  color: var(--gray-400);
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 6px 20px;
  border-radius: 8px 8px 0 0;
  margin-bottom: 0;
  border: 1px solid #2a2a3e;
  border-bottom: none;
}
.code-label + pre {
  border-radius: 0 0 8px 8px;
  margin-top: 0;
}

/* ============================================================
   CALLOUT BOXES
   ============================================================ */
.callout {
  border-radius: 8px;
  padding: 14px 16px;
  margin: 16px 0;
  display: flex;
  gap: 12px;
  font-size: 14px;
  line-height: 1.6;
}
.callout .callout-icon { font-size: 18px; flex-shrink: 0; padding-top: 1px; }
.callout .callout-body { flex: 1; }
.callout .callout-title { font-weight: 700; margin-bottom: 4px; display: block; }
.callout.tip    { background: #ecfeff; border: 1px solid #a5f3fc; color: #0e7490; }
.callout.warn   { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }
.callout.danger { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }
.callout.info   { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; }
.callout.cost   { background: #fdf4ff; border: 1px solid #e9d5ff; color: #6b21a8; }

/* ============================================================
   ERROR DETAILS BLOCK
   ============================================================ */
details.error-block {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  margin-top: 16px;
  overflow: hidden;
}
details.error-block summary {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  color: #991b1b;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
details.error-block summary::before {
  content: '▶';
  font-size: 10px;
  transition: transform .2s;
}
details.error-block[open] summary::before { transform: rotate(90deg); }
details.error-block .error-body {
  padding: 4px 16px 16px;
  font-size: 13px;
  color: #7f1d1d;
  line-height: 1.7;
}
details.error-block .error-body p { margin-bottom: 8px; }
details.error-block .error-body ul { margin-left: 18px; }

/* ============================================================
   MOCK SCREENSHOTS — SHARED
   ============================================================ */
.mock-screen {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin: 20px 0;
  max-width: 700px;
  font-family: var(--font-mono);
}
.screen-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  height: 34px;
}
.titlebar-dots { display: flex; gap: 6px; }
.dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  display: inline-block;
}
.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }
.screen-caption {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--gray-500);
  text-align: center;
  margin-top: 6px;
  font-style: italic;
}

/* ============================================================
   TERMINAL MOCKUP
   ============================================================ */
.mock-screen.terminal .screen-titlebar {
  background: #3c3c3c;
}
.titlebar-center {
  flex: 1;
  text-align: center;
  font-size: 12px;
  font-family: var(--font-sans);
  color: #aaa;
}
.mock-screen.terminal .screen-body {
  background: #1a1a2e;
  color: #e0e0e0;
  padding: 14px 18px;
  min-height: 140px;
  font-size: 13px;
  line-height: 2;
}
.t-prompt { color: #50fa7b; }
.t-cmd    { color: #f1fa8c; }
.t-path   { color: #8be9fd; }
.t-out    { color: #cdd6f4; }
.t-ok     { color: #50fa7b; }
.t-err    { color: #ff5555; }
.t-comment{ color: #6272a4; }

/* ============================================================
   BROWSER MOCKUP
   ============================================================ */
.mock-screen.browser .screen-titlebar {
  background: #dfe1e5;
  padding: 6px 14px;
  height: auto;
  min-height: 36px;
  flex-wrap: wrap;
  gap: 8px;
}
.browser-urlbar {
  flex: 1;
  background: #fff;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-family: var(--font-sans);
  color: #333;
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  overflow: hidden;
  border: 1px solid #c6c9cc;
}
.browser-urlbar .lock { color: #30a66f; font-size: 11px; }
.browser-urlbar .url-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #555;
}
.mock-screen.browser .screen-body {
  background: #fff;
  min-height: 200px;
  font-family: var(--font-sans);
  font-size: 13px;
}

/* ============================================================
   IDE MOCKUP (CURSOR / VS CODE)
   ============================================================ */
.mock-screen.ide .screen-titlebar {
  background: #2d2d2d;
}
.ide-titlebar-text {
  font-size: 12px;
  font-family: var(--font-sans);
  color: #ccc;
  flex: 1;
  text-align: center;
}
.mock-screen.ide .ide-layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  min-height: 220px;
}
.ide-sidebar {
  background: #252526;
  padding: 8px 0;
  border-right: 1px solid #3d3d3d;
}
.ide-sidebar-header {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #bbb;
  padding: 4px 12px 8px;
}
.ide-file {
  font-size: 12px;
  font-family: var(--font-mono);
  padding: 3px 12px 3px 24px;
  color: #ccc;
  cursor: default;
}
.ide-file.folder {
  color: #e2c08d;
  padding-left: 12px;
}
.ide-file.active { background: #094771; color: #fff; }
.ide-editor {
  background: #1e1e1e;
  padding: 12px 16px;
  overflow: hidden;
}
.ide-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #1e1e1e;
  color: #ccc;
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 4px 14px;
  border-bottom: 2px solid #007acc;
}
.ide-code {
  font-size: 12px;
  font-family: var(--font-mono);
  color: #cdd6f4;
  line-height: 1.9;
  padding-top: 8px;
}
.ide-ln { color: #555; user-select: none; display: inline-block; min-width: 28px; text-align: right; margin-right: 16px; }
.ide-kw { color: #ff79c6; }
.ide-str { color: #f1fa8c; }
.ide-fn  { color: #50fa7b; }
.ide-var { color: #8be9fd; }
.ide-cmt { color: #6272a4; }

/* AI Chat panel */
.ide-chat-panel {
  background: #252526;
  border-left: 1px solid #3d3d3d;
  display: flex;
  flex-direction: column;
  min-width: 240px;
}
.ide-chat-header {
  font-size: 11px;
  color: #bbb;
  padding: 8px 12px;
  border-bottom: 1px solid #3d3d3d;
  font-family: var(--font-sans);
  background: #2d2d2d;
}
.ide-chat-body { padding: 10px 12px; flex: 1; overflow: auto; }
.ide-chat-msg {
  font-size: 12px;
  font-family: var(--font-sans);
  line-height: 1.5;
  margin-bottom: 10px;
  padding: 8px 10px;
  border-radius: 6px;
}
.ide-chat-msg.user   { background: #094771; color: #e0e0e0; }
.ide-chat-msg.ai     { background: #2d4a2d; color: #b5d1b5; }
.ide-chat-input {
  background: #1e1e1e;
  border-top: 1px solid #3d3d3d;
  padding: 8px 12px;
  font-size: 12px;
  font-family: var(--font-sans);
  color: #888;
  font-style: italic;
}

/* ============================================================
   GOOGLE AI STUDIO MOCKUP
   ============================================================ */
.mock-screen.aistudio .screen-titlebar {
  background: #f0f4f9;
  border-bottom: 1px solid #dadce0;
}
.aistudio-logo {
  font-size: 13px;
  font-family: var(--font-sans);
  font-weight: 600;
  color: #1a73e8;
  flex: 1;
}
.mock-screen.aistudio .aistudio-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 260px;
  background: #fff;
}
.aistudio-left {
  background: #f8f9fa;
  border-right: 1px solid #e8eaed;
  padding: 12px;
}
.aistudio-section-title {
  font-size: 11px;
  font-weight: 600;
  color: #80868b;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin: 8px 0 4px;
}
.aistudio-model-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #e8f0fe;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 12px;
  color: #1a73e8;
  margin-bottom: 6px;
}
.aistudio-chat {
  display: flex;
  flex-direction: column;
  padding: 16px;
}
.aistudio-msg {
  margin-bottom: 12px;
  font-size: 13px;
  line-height: 1.6;
}
.aistudio-msg.user .aistudio-msg-label {
  font-size: 11px;
  font-weight: 600;
  color: #1a73e8;
  margin-bottom: 2px;
}
.aistudio-msg.ai .aistudio-msg-label {
  font-size: 11px;
  font-weight: 600;
  color: #188038;
  margin-bottom: 2px;
}
.aistudio-msg.ai .aistudio-msg-body {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
}
.aistudio-input-bar {
  margin-top: auto;
  background: #f0f4f9;
  border-radius: 24px;
  padding: 10px 16px;
  font-size: 12px;
  color: #aaa;
  border: 1px solid #dadce0;
  font-style: italic;
}

/* ============================================================
   GITHUB MOCKUP
   ============================================================ */
.mock-screen.github .screen-titlebar {
  background: #161b22;
}
.github-logo-text {
  font-size: 14px;
  font-weight: 700;
  color: #f0f6fc;
  font-family: var(--font-sans);
}
.mock-screen.github .github-header {
  background: #161b22;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid #30363d;
}
.github-repo-path {
  font-size: 14px;
  font-family: var(--font-mono);
  color: #58a6ff;
}
.github-repo-path .sep { color: #6e7681; margin: 0 4px; }
.mock-screen.github .github-body {
  background: #0d1117;
  color: #c9d1d9;
  padding: 0;
  min-height: 180px;
}
.github-tabs {
  display: flex;
  border-bottom: 1px solid #30363d;
  padding: 0 16px;
}
.github-tab {
  padding: 10px 14px;
  font-size: 13px;
  font-family: var(--font-sans);
  color: #8b949e;
  border-bottom: 2px solid transparent;
}
.github-tab.active {
  color: #f0f6fc;
  border-bottom-color: #f78166;
}
.github-file-list { padding: 0; }
.github-file-row {
  display: flex;
  align-items: center;
  padding: 7px 16px;
  border-bottom: 1px solid #21262d;
  font-size: 13px;
  gap: 8px;
}
.github-file-row:hover { background: #161b22; }
.github-file-icon { color: #8b949e; width: 16px; }
.github-file-name { color: #58a6ff; flex: 1; }
.github-commit-msg { color: #8b949e; font-size: 12px; }

/* ============================================================
   VERCEL MOCKUP
   ============================================================ */
.mock-screen.vercel .screen-titlebar {
  background: #000;
}
.vercel-logo-text {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-sans);
  flex: 1;
}
.mock-screen.vercel .vercel-body {
  background: #000;
  color: #eee;
  padding: 16px 20px;
  min-height: 180px;
}
.vercel-project-card {
  background: #111;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 14px 16px;
}
.vercel-project-name { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.vercel-deploy-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #0a3300;
  color: #4cc38a;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 8px;
}
.vercel-url {
  font-size: 12px;
  color: #0070f3;
  font-family: var(--font-mono);
}
.vercel-time { font-size: 11px; color: #888; margin-top: 4px; }

/* ============================================================
   SUPABASE MOCKUP
   ============================================================ */
.mock-screen.supabase .screen-titlebar {
  background: #1c1c1c;
}
.supabase-logo-text {
  font-size: 13px;
  font-weight: 700;
  color: #3ecf8e;
  font-family: var(--font-sans);
  flex: 1;
}
.mock-screen.supabase .supabase-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 220px;
}
.supabase-nav {
  background: #1c1c1c;
  padding: 8px 0;
  border-right: 1px solid #2a2a2a;
}
.supabase-nav-item {
  padding: 8px 16px;
  font-size: 13px;
  color: #888;
  cursor: default;
  display: flex;
  align-items: center;
  gap: 8px;
}
.supabase-nav-item.active { background: #2a2a2a; color: #fff; }
.supabase-nav-item .icon { font-size: 14px; }
.supabase-main {
  background: #181818;
  padding: 16px;
  color: #ccc;
}
.supabase-table-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.supabase-table-title { font-size: 16px; font-weight: 600; color: #fff; }
.supabase-btn {
  background: #3ecf8e;
  color: #000;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
}
.supabase-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  font-family: var(--font-mono);
}
.supabase-table th {
  background: #222;
  color: #888;
  text-align: left;
  padding: 6px 10px;
  border: 1px solid #2a2a2a;
}
.supabase-table td {
  padding: 6px 10px;
  border: 1px solid #2a2a2a;
  color: #ccc;
}
.supabase-table tr:nth-child(even) td { background: #1e1e1e; }

/* ============================================================
   DIAGRAMS / FLOWCHARTS
   ============================================================ */
.diagram {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 28px;
  margin: 20px 0;
  overflow-x: auto;
}
.diagram-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 20px;
  text-align: center;
}
.flow-row {
  display: flex;
  align-items: center;
  gap: 0;
  justify-content: center;
  flex-wrap: wrap;
  row-gap: 12px;
}
.flow-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 90px;
}
.flow-box {
  background: var(--primary-light);
  border: 2px solid var(--primary);
  color: var(--primary-dark);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  white-space: nowrap;
}
.flow-box.green   { background: #d1fae5; border-color: #10b981; color: #065f46; }
.flow-box.purple  { background: #ede9fe; border-color: #8b5cf6; color: #4c1d95; }
.flow-box.orange  { background: #fef3c7; border-color: #f59e0b; color: #92400e; }
.flow-box.red     { background: #fee2e2; border-color: #ef4444; color: #991b1b; }
.flow-box.gray    { background: var(--gray-100); border-color: var(--gray-300); color: var(--gray-700); }
.flow-box.dark    { background: var(--gray-800); border-color: var(--gray-600); color: #f1f5f9; }
.flow-label { font-size: 10px; color: var(--gray-500); text-align: center; }
.flow-arrow {
  font-size: 20px;
  color: var(--gray-400);
  padding: 0 4px;
  flex-shrink: 0;
  align-self: center;
  margin-bottom: 18px;
}
.flow-down-arrow {
  text-align: center;
  font-size: 20px;
  color: var(--gray-400);
  margin: 4px 0;
}

/* ============================================================
   COMPARISON TABLE
   ============================================================ */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 13px;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.comparison-table th {
  background: var(--gray-800);
  color: #f1f5f9;
  padding: 10px 14px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
}
.comparison-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
  vertical-align: top;
}
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:hover td { background: var(--gray-50); }
.comparison-table .tag-free { color: #059669; font-weight: 600; }
.comparison-table .tag-paid { color: #7c3aed; font-weight: 600; }
.comparison-table .tag-opt  { color: var(--warning); font-weight: 600; }

/* ============================================================
   BREADCRUMB / PAGE HEADER
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--gray-500);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--gray-300); }

/* ============================================================
   INDEX PAGE SPECIFIC
   ============================================================ */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1e293b 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 48px 40px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: rgba(59,130,246,.15);
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -80px; left: 20%;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: rgba(139,92,246,.08);
}
.hero-content { position: relative; z-index: 1; }
.hero-tag {
  display: inline-block;
  background: rgba(59,130,246,.3);
  color: #93c5fd;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid rgba(59,130,246,.4);
  margin-bottom: 16px;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.hero h1 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
}
.hero .subtitle {
  font-size: 16px;
  color: #94a3b8;
  margin-bottom: 28px;
  line-height: 1.6;
}
.hero-stats {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat .value {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  display: block;
}
.hero-stat .label {
  font-size: 11px;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.path-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.path-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.path-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.path-icon.a { background: #dbeafe; }
.path-icon.b { background: #ede9fe; }
.path-icon.opt { background: #fef3c7; }
.path-card-header h3 { font-size: 16px; font-weight: 700; }
.path-card-header .path-time { font-size: 12px; color: var(--gray-500); }
.path-flow {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.path-flow .pf-node {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-700);
}
.path-flow .pf-node.highlight {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary-dark);
}
.path-flow .pf-arrow { color: var(--gray-400); font-size: 14px; }

.lecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.lecture-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  color: inherit;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow);
}
.lecture-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.lecture-card .lc-number {
  font-size: 11px;
  font-weight: 700;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.lecture-card .lc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-800);
  line-height: 1.4;
}
.lecture-card .lc-meta {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}
.lecture-card .lc-time {
  font-size: 12px;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 4px;
}
.lecture-card .lc-bar {
  height: 3px;
  border-radius: 2px;
  margin-top: 6px;
}
.lc-bar.bar-a   { background: var(--phase-1); }
.lc-bar.bar-b   { background: var(--phase-2); }
.lc-bar.bar-opt { background: var(--phase-4); }
.lc-bar.bar-common { background: var(--gray-300); }

/* ============================================================
   FOOTER NAV
   ============================================================ */
.lecture-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}
.lecture-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
}
.lecture-nav a:hover { text-decoration: underline; }
.lecture-nav .nav-label { font-size: 10px; color: var(--gray-400); display: block; text-transform: uppercase; }

/* ============================================================
   UTILITY
   ============================================================ */
.section-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-800);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--gray-200);
}
.divider { border: none; border-top: 1px solid var(--gray-200); margin: 32px 0; }
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.tag.free    { background: #d1fae5; color: #065f46; }
.tag.paid    { background: #ede9fe; color: #4c1d95; }
.tag.windows { background: #dbeafe; color: #1e40af; }
.tag.mac     { background: #f1f5f9; color: #334155; }
.icon-label {
  display: flex;
  align-items: center;
  gap: 6px;
}