/* ============================================
   Google Codelabs Style - Claude Code & Antigravity
   Premium Dark Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ── CSS Variables ── */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2236;
  --bg-card: #151d2e;
  --bg-code: #0d1117;
  --bg-hover: #1e293b;
  --bg-glass: rgba(17, 24, 39, 0.8);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-heading: #f1f5f9;

  --accent-purple: #a78bfa;
  --accent-purple-dim: rgba(167, 139, 250, 0.15);
  --accent-blue: #60a5fa;
  --accent-blue-dim: rgba(96, 165, 250, 0.15);
  --accent-green: #34d399;
  --accent-green-dim: rgba(52, 211, 153, 0.15);
  --accent-orange: #fb923c;
  --accent-orange-dim: rgba(251, 146, 60, 0.15);
  --accent-red: #f87171;
  --accent-red-dim: rgba(248, 113, 113, 0.15);
  --accent-cyan: #22d3ee;
  --accent-yellow: #fbbf24;

  --border-color: #1e293b;
  --border-accent: #334155;

  --gradient-purple: linear-gradient(135deg, #7c3aed, #a78bfa);
  --gradient-blue: linear-gradient(135deg, #2563eb, #60a5fa);
  --gradient-green: linear-gradient(135deg, #059669, #34d399);
  --gradient-orange: linear-gradient(135deg, #ea580c, #fb923c);
  --gradient-hero: linear-gradient(135deg, #0a0e17 0%, #1a1040 50%, #0a0e17 100%);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-purple: 0 0 20px rgba(167, 139, 250, 0.2);
  --shadow-glow-blue: 0 0 20px rgba(96, 165, 250, 0.2);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --sidebar-width: 300px;
  --header-height: 70px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent-purple);
  color: #fff;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-accent); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-purple); }

/* ── Header ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 0 24px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-logo {
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--gradient-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.header-divider {
  width: 1px;
  height: 28px;
  background: var(--border-accent);
}

.header-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.header-badge.time {
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-accent);
  color: var(--text-primary);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ── Module Tabs ── */
.module-tabs {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  z-index: 99;
  display: flex;
  padding: 0 24px;
  gap: 4px;
  overflow-x: auto;
}

.module-tab {
  padding: 14px 24px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
}

.module-tab:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

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

.module-tab .tab-icon {
  font-size: 1.1rem;
}

/* ── Layout ── */
.layout {
  display: flex;
  justify-content: center;
  margin-top: calc(var(--header-height) + 52px);
  min-height: calc(100vh - var(--header-height) - 52px);
  padding-left: var(--sidebar-width);
}

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  top: calc(var(--header-height) + 52px);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height) - 52px);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 20px 0;
  z-index: 50;
  transition: transform 0.3s ease;
}

.sidebar-section-title {
  padding: 8px 20px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}

.sidebar-nav {
  list-style: none;
}

.sidebar-item {
  display: flex;
  align-items: center;
  padding: 10px 20px;
  gap: 12px;
  cursor: pointer;
  transition: var(--transition);
  border-left: 3px solid transparent;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.sidebar-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-item.active {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  border-left-color: var(--accent-purple);
  font-weight: 500;
}

.sidebar-item.completed .step-num {
  background: var(--accent-green);
  color: #fff;
}

.step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
  transition: var(--transition);
}

.sidebar-item.active .step-num {
  background: var(--accent-purple);
  color: #fff;
}

/* ── Main Content ── */
.main-content {
  flex: 1;
  padding: 40px 60px 80px;
  max-width: 1000px;
  width: 100%;
}

/* ── Module Sections ── */
.module-content {
  display: none;
  animation: fadeIn 0.4s ease;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Step Sections ── */
.step-section {
  display: none;
  animation: slideIn 0.35s ease;
}

.step-section.active {
  display: block;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(15px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ── Typography ── */
h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-heading);
  margin: 40px 0 16px;
  letter-spacing: -0.3px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 28px 0 12px;
}

h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-purple);
  margin: 20px 0 8px;
}

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

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

em {
  color: var(--accent-blue);
  font-style: italic;
}

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

a:hover {
  color: var(--accent-purple);
  text-decoration: underline;
}

ul, ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

li {
  margin-bottom: 8px;
  color: var(--text-primary);
}

li::marker {
  color: var(--accent-purple);
}

/* ── Code Blocks ── */
.code-block {
  position: relative;
  margin: 16px 0 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-code);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.code-lang {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.code-filename {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-family: 'JetBrains Mono', monospace;
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--bg-hover);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: var(--transition);
}

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

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

pre {
  padding: 20px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-primary);
}

code {
  font-family: 'JetBrains Mono', monospace;
}

:not(pre) > code {
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--accent-cyan);
  border: 1px solid var(--border-color);
}

/* ── Syntax Highlighting ── */
.token-keyword { color: #c792ea; }
.token-string { color: #c3e88d; }
.token-comment { color: #546e7a; font-style: italic; }
.token-function { color: #82aaff; }
.token-number { color: #f78c6c; }
.token-property { color: #ffcb6b; }
.token-operator { color: #89ddff; }
.token-tag { color: #f07178; }
.token-attr { color: #ffcb6b; }
.token-value { color: #c3e88d; }

/* ── Info Boxes (Alertas) ── */
.info-box {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  border-left: 4px solid;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.info-box .box-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.info-box .box-content {
  flex: 1;
}

.info-box .box-title {
  font-weight: 600;
  margin-bottom: 4px;
  font-size: 0.9rem;
}

.info-box p { margin-bottom: 8px; }
.info-box p:last-child { margin-bottom: 0; }

.info-box.tip {
  background: var(--accent-green-dim);
  border-color: var(--accent-green);
}
.info-box.tip .box-icon, .info-box.tip .box-title { color: var(--accent-green); }

.info-box.note {
  background: var(--accent-blue-dim);
  border-color: var(--accent-blue);
}
.info-box.note .box-icon, .info-box.note .box-title { color: var(--accent-blue); }

.info-box.warning {
  background: var(--accent-orange-dim);
  border-color: var(--accent-orange);
}
.info-box.warning .box-icon, .info-box.warning .box-title { color: var(--accent-orange); }

.info-box.danger {
  background: var(--accent-red-dim);
  border-color: var(--accent-red);
}
.info-box.danger .box-icon, .info-box.danger .box-title { color: var(--accent-red); }

.info-box.concept {
  background: var(--accent-purple-dim);
  border-color: var(--accent-purple);
}
.info-box.concept .box-icon, .info-box.concept .box-title { color: var(--accent-purple); }

/* ── Prompt Examples ── */
.prompt-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 16px 0;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.prompt-box:hover {
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-glow-purple);
}

.prompt-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-purple);
  margin-bottom: 8px;
}

.prompt-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.prompt-box .copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
}

/* ── Tables ── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

thead {
  background: var(--bg-tertiary);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--accent-purple);
  border-bottom: 2px solid var(--border-accent);
}

td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.88rem;
  color: var(--text-primary);
}

tr:hover td {
  background: var(--bg-hover);
}

/* ── Cards ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--accent-purple);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-purple);
}

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

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Objective Tags ── */
.objectives {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.objective-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
}

/* ── Step Header ── */
.step-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-purple);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: var(--shadow-glow-purple);
}

.step-meta {
  flex: 1;
}

.step-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-heading);
  margin: 0;
  border: none;
  padding: 0;
}

.step-duration {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ── Navigation Buttons ── */
.step-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.nav-btn:hover {
  border-color: var(--accent-purple);
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}

.nav-btn.primary {
  background: var(--gradient-purple);
  border: none;
  color: #fff;
}

.nav-btn.primary:hover {
  box-shadow: var(--shadow-glow-purple);
  transform: translateY(-1px);
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ── Collapsible Sections ── */
.collapsible {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 16px 0;
  overflow: hidden;
}

.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--bg-card);
  cursor: pointer;
  transition: var(--transition);
}

.collapsible-header:hover {
  background: var(--bg-hover);
}

.collapsible-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 8px;
}

.collapsible-arrow {
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.collapsible.open .collapsible-arrow {
  transform: rotate(180deg);
}

.collapsible-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.collapsible.open .collapsible-body {
  max-height: 2000px;
}

.collapsible-content {
  padding: 20px;
  border-top: 1px solid var(--border-color);
}

/* ── Image Placeholder ── */
.img-placeholder {
  background: var(--bg-tertiary);
  border: 2px dashed var(--border-accent);
  border-radius: var(--radius-md);
  padding: 40px 20px;
  text-align: center;
  margin: 20px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.img-placeholder .ph-icon {
  font-size: 2rem;
  margin-bottom: 8px;
  display: block;
}

/* ── Progress bar ── */
.progress-bar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-purple);
  z-index: 101;
  transition: width 0.3s ease;
}

/* ── Diagram boxes ── */
.diagram-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 24px 0;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.diagram-step {
  padding: 10px 18px;
  background: var(--accent-purple-dim);
  border: 1px solid var(--accent-purple);
  border-radius: var(--radius-sm);
  color: var(--accent-purple);
  font-weight: 600;
  font-size: 0.88rem;
  text-align: center;
}

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

/* ── Keyboard shortcuts ── */
kbd {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--accent-yellow);
  box-shadow: 0 2px 0 var(--border-color);
}

/* ── Separator ── */
hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 32px 0;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .main-content {
    padding: 30px 32px 60px;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .main-content {
    margin-left: 0;
    padding: 24px 16px 60px;
  }

  .menu-toggle {
    display: block;
  }

  .header-subtitle {
    display: none;
  }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }

  .module-tabs {
    padding: 0 12px;
  }

  .module-tab {
    padding: 12px 16px;
    font-size: 0.82rem;
  }

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

  .step-nav {
    flex-direction: column;
    gap: 12px;
  }

  .nav-btn {
    width: 100%;
    justify-content: center;
  }

  table {
    font-size: 0.8rem;
  }

  th, td {
    padding: 8px 10px;
  }
}

/* ── Print ── */
@media print {
  .header, .sidebar, .module-tabs, .progress-bar, .step-nav, .copy-btn, .menu-toggle {
    display: none !important;
  }
  .main-content {
    margin-left: 0;
    padding: 0;
  }
  .module-content, .step-section {
    display: block !important;
  }
  body {
    background: #fff;
    color: #000;
  }
}