/* ==========================================================================
   Content Page Design System — Editorial / Reading-focused
   Used by: how-i-use-ai/ (and its dispatches sub-pages)
   Distinct from the academic homepage (style.css)
   ========================================================================== */

/* === Design Tokens === */
:root {
  /* Colors — warm ink / charcoal editorial palette */
  --cp-text: #292524;
  --cp-text-secondary: #57534e;
  --cp-text-muted: #a8a29e;
  --cp-accent: #b45309;
  --cp-accent-hover: #92400e;
  --cp-accent-bg: #fffbeb;
  --cp-bg: #fafaf9;
  --cp-bg-surface: #f5f5f4;
  --cp-bg-code: #f5f5f4;
  --cp-border: #e7e5e4;
  --cp-border-light: #f5f5f4;

  /* Typography */
  --cp-font-sans: 'Inter', -apple-system, system-ui, 'Segoe UI', Helvetica, Arial, sans-serif;
  --cp-font-mono: ui-monospace, 'SF Mono', SFMono-Regular, 'Menlo', 'Consolas', monospace;

  /* Spacing */
  --cp-space-xs: 4px;
  --cp-space-sm: 8px;
  --cp-space-md: 16px;
  --cp-space-lg: 24px;
  --cp-space-xl: 32px;
  --cp-space-2xl: 48px;

  /* Radius */
  --cp-radius-sm: 4px;
  --cp-radius-md: 6px;
  --cp-radius-lg: 10px;

  /* Content width */
  --cp-content-width: 680px;
}

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

body {
  font-family: var(--cp-font-sans);
  font-size: 17px;
  line-height: 1.7;
  color: var(--cp-text);
  background: var(--cp-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Top Navigation Bar === */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cp-bg);
  border-bottom: 1px solid var(--cp-border);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  backdrop-filter: blur(8px);
  background: rgba(250, 250, 249, 0.92);
}

.topbar-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--cp-text);
  text-decoration: none;
}

.topbar-name:hover {
  color: var(--cp-accent);
}

.topbar-back {
  font-size: 14px;
  color: var(--cp-text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 4px;
}

.topbar-back:hover {
  color: var(--cp-accent);
}

/* === Main Content === */
.content {
  max-width: var(--cp-content-width);
  margin: 0 auto;
  padding: var(--cp-space-2xl) var(--cp-space-lg);
}

/* === Cross-Navigation === */
.cross-nav {
  display: flex;
  gap: var(--cp-space-md);
  margin-bottom: var(--cp-space-xl);
  padding-bottom: var(--cp-space-md);
  border-bottom: 1px solid var(--cp-border-light);
}

.cross-nav a {
  font-size: 14px;
  color: var(--cp-text-muted);
  text-decoration: none;
  padding: 4px 12px;
  border-radius: 9999px;
  border: 1px solid var(--cp-border);
  transition: all 0.15s;
}

.cross-nav a:hover {
  color: var(--cp-accent);
  border-color: var(--cp-accent);
}

.cross-nav .active {
  color: var(--cp-text);
  background: var(--cp-bg-surface);
  border: 1px solid var(--cp-text-muted);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 14px;
  font-weight: 600;
}

/* === Typography === */
h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.3;
  color: var(--cp-text);
  margin-bottom: var(--cp-space-md);
}

.page-subtitle {
  font-size: 17px;
  color: var(--cp-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--cp-space-lg);
}

.page-updated {
  font-size: 14px;
  color: var(--cp-text-secondary);
  font-style: italic;
  margin-bottom: var(--cp-space-xl);
}

h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--cp-text);
  margin-top: var(--cp-space-2xl);
  margin-bottom: var(--cp-space-md);
  padding-bottom: var(--cp-space-sm);
  border-bottom: 1px solid var(--cp-border);
}

h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--cp-text-secondary);
  margin-top: 40px;
  margin-bottom: var(--cp-space-sm);
}

p {
  margin-bottom: 14px;
  line-height: 1.7;
}

/* === Links === */
a {
  color: var(--cp-accent);
  text-decoration: none;
  transition: color 0.15s;
}

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

/* === Table of Contents === */
.toc {
  background: var(--cp-bg-surface);
  border: 1px solid var(--cp-border);
  border-radius: var(--cp-radius-lg);
  padding: var(--cp-space-lg) var(--cp-space-lg);
  margin-bottom: var(--cp-space-xl);
}

.toc p {
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--cp-space-sm);
  color: var(--cp-text-muted);
}

.toc ol {
  padding-left: 20px;
  margin: 0;
}

.toc ol li {
  margin-bottom: 4px;
  font-size: 15px;
  line-height: 1.6;
}

.toc ol li a {
  color: var(--cp-text-secondary);
  text-decoration: none;
}

.toc ol li a:hover {
  color: var(--cp-accent);
}

.toc ol ol {
  padding-left: 18px;
  margin-top: 4px;
}

.toc ol ol li {
  list-style-type: disc;
}

/* === Collapsible Details === */
details {
  margin-bottom: 12px;
  border: 1px solid var(--cp-border);
  border-radius: var(--cp-radius-md);
  overflow: hidden;
}

details summary {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--cp-text);
  background: #fff;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--cp-space-sm);
  transition: background 0.15s;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::before {
  content: "\25B6";
  font-size: 10px;
  color: var(--cp-text-muted);
  transition: transform 0.2s;
  display: inline-block;
  flex-shrink: 0;
}

details[open] summary::before {
  transform: rotate(90deg);
}

details summary:hover {
  background: var(--cp-bg-surface);
}

details .details-content {
  padding: 16px;
  border-top: 1px solid var(--cp-border);
  background: #fff;
}

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

details .details-content p:last-child {
  margin-bottom: 0;
}

details .details-content ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 12px;
}

details .details-content ol {
  padding-left: 20px;
  margin-bottom: 12px;
}

details .details-content li {
  margin-bottom: 6px;
  line-height: 1.6;
}

/* Nested details */
details details {
  margin-top: 12px;
}

/* === Code === */
code {
  background: var(--cp-bg-code);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 14px;
  font-family: var(--cp-font-mono);
  color: var(--cp-text);
}

pre {
  background: var(--cp-bg-code);
  border: 1px solid var(--cp-border);
  border-radius: var(--cp-radius-sm);
  padding: 14px var(--cp-space-md);
  overflow-x: auto;
  margin: 12px 0 16px 0;
  line-height: 1.5;
  position: relative;
}

pre .copy-btn {
  float: right;
  margin: -6px -8px 4px 8px;
  background: #fff;
  border: 1px solid var(--cp-border);
  border-radius: var(--cp-radius-sm);
  padding: 2px 10px;
  font-size: 12px;
  font-family: var(--cp-font-sans);
  font-weight: 500;
  color: var(--cp-text-secondary);
  cursor: pointer;
  line-height: 1.4;
  transition: background 0.15s, color 0.15s;
}

pre .copy-btn:hover {
  background: var(--cp-bg-surface);
  color: var(--cp-text);
}

pre code {
  background: none;
  padding: 0;
  font-size: 13px;
}

/* === Lists (outside details) === */
ul {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 14px;
}

ul li {
  margin-bottom: 6px;
  line-height: 1.6;
}

ol {
  padding-left: 20px;
  margin-bottom: 14px;
}

ol li {
  margin-bottom: 6px;
  line-height: 1.6;
}

/* === Page Footer === */
.page-footer {
  margin-top: var(--cp-space-2xl);
  padding-top: var(--cp-space-lg);
  border-top: 1px solid var(--cp-border);
  font-size: 14px;
  color: var(--cp-text-muted);
}

/* ==========================================================================
   How I Use AI — Dispatch cards, principles list, section intros
   ========================================================================== */

.section-intro {
  color: var(--cp-text-secondary);
  font-style: italic;
  margin-bottom: var(--cp-space-md);
}

.principles-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: var(--cp-space-lg);
}

.principles-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--cp-border-light);
  line-height: 1.65;
}

.principles-list li:last-child {
  border-bottom: none;
}

.principles-list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--cp-text);
}

/* Dispatch cards */
.dispatch-card {
  margin-bottom: var(--cp-space-md);
}

.dispatch-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 13px;
  margin-bottom: 6px;
  font-family: var(--cp-font-mono);
}

.dispatch-num {
  color: var(--cp-accent);
  font-weight: 600;
}

.dispatch-date {
  color: var(--cp-text-muted);
}

/* Linked (own-page) dispatch: no <details>, shows title + teaser + read link */
.dispatch-card--linked {
  border: 1px solid var(--cp-border);
  border-radius: var(--cp-radius-md);
  padding: 16px 18px;
  background: #fff;
}

.dispatch-title {
  font-size: 18px;
  font-weight: 600;
  margin-top: 2px;
  margin-bottom: 8px;
  line-height: 1.35;
}

.dispatch-title a {
  color: var(--cp-text);
  text-decoration: none;
}

.dispatch-title a:hover {
  color: var(--cp-accent);
}

.dispatch-teaser {
  color: var(--cp-text-secondary);
  margin-bottom: 10px;
  font-size: 15.5px;
  line-height: 1.6;
}

.dispatch-read-link {
  margin-bottom: 0;
}

.dispatch-read-link a {
  color: var(--cp-accent);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
}

.dispatch-read-link a:hover {
  color: var(--cp-accent-hover);
  text-decoration: underline;
}

/* ==========================================================================
   AI Automates Research — Page-specific styles
   ========================================================================== */

/* Hero section */
.air-hero {
  background: #fff;
  border: 1px solid var(--cp-border);
  border-radius: var(--cp-radius-lg);
  padding: var(--cp-space-lg) 28px;
  margin-top: var(--cp-space-md);
  margin-bottom: var(--cp-space-xl);
}

.air-hero-thesis {
  font-size: 17px;
  line-height: 1.7;
  color: var(--cp-text);
  margin-bottom: var(--cp-space-md);
}

.air-hero-cta {
  display: inline-block;
  background: var(--cp-accent);
  color: #fff;
  padding: 8px 18px;
  border-radius: var(--cp-radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s;
}

.air-hero-cta:hover,
.air-hero-cta:focus {
  background: var(--cp-accent-hover);
  color: #fff;
}

/* Scoreboard table */
.air-scoreboard {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--cp-space-xl);
}

.air-scoreboard th {
  text-align: left;
  padding: 10px 14px;
  background: var(--cp-bg-surface);
  border-bottom: 2px solid var(--cp-border);
  font-size: 14px;
  font-weight: 600;
  color: var(--cp-text);
}

.air-scoreboard th:first-child,
.air-scoreboard td:first-child {
  width: 45%;
}

.air-scoreboard td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--cp-border);
  font-size: 14px;
  color: var(--cp-text);
}

/* Timeline */
.air-timeline {
  position: relative;
  padding-left: 28px;
  border-left: 3px solid var(--cp-accent);
  margin: 20px 0 30px 12px;
}

.air-timeline-node {
  position: relative;
  margin-bottom: 4px;
}

.air-timeline-node::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 14px;
  width: 12px;
  height: 12px;
  background: var(--cp-accent);
  border-radius: 50%;
  border: 2px solid var(--cp-bg);
  box-shadow: 0 0 0 2px var(--cp-accent);
}

/* Round date badge */
.air-round-date {
  display: inline-block;
  background: var(--cp-accent-bg);
  color: var(--cp-accent-hover);
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 9999px;
  margin-right: 6px;
  font-weight: 600;
  white-space: nowrap;
}

/* Round outcome (visible when collapsed) */
.air-round-outcome {
  display: block;
  font-size: 13px;
  color: var(--cp-text-secondary);
  font-weight: 400;
  margin-top: 4px;
  padding-left: 19px;
}

/* Two-column human/AI layout */
.air-round-cols {
  display: flex;
  gap: var(--cp-space-md);
  margin: 14px 0;
}

.air-round-human,
.air-round-ai {
  flex: 1;
  padding: 14px;
  border-radius: var(--cp-radius-md);
  font-size: 14px;
}

.air-round-human {
  background: #fff;
  border-left: 3px solid var(--cp-accent);
}

.air-round-ai {
  background: #f5f5f4;
  border-left: 3px solid var(--cp-text-secondary);
}

.air-round-human::before,
.air-round-ai::before {
  display: block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.air-round-human::before {
  content: "Human";
  color: var(--cp-accent-hover);
}

.air-round-ai::before {
  content: "Claude Code";
  color: var(--cp-text-secondary);
}

.air-round-human ul,
.air-round-ai ul {
  list-style: disc;
  padding-left: 18px;
  margin: 0;
}

.air-round-human li,
.air-round-ai li {
  margin-bottom: 6px;
  line-height: 1.5;
  font-size: 14px;
}

/* Lesson callout box */
.air-lesson {
  background: #fffbeb;
  border: 1px solid var(--cp-accent);
  border-left: 4px solid var(--cp-accent);
  border-radius: var(--cp-radius-sm);
  padding: 12px var(--cp-space-md);
  margin: 14px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--cp-text);
}

.air-lesson::before {
  content: "Lesson: ";
  font-weight: 700;
  color: var(--cp-accent-hover);
}

/* PDF link */
.air-pdf-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
}

.air-pdf-link::before {
  content: "\1F4C4";
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media screen and (max-width: 768px) {
  .content {
    padding: var(--cp-space-lg) var(--cp-space-md);
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  .topbar {
    padding: 12px 16px;
  }

  .cross-nav {
    flex-wrap: wrap;
    gap: var(--cp-space-sm);
  }

  /* AI Research responsive */
  .air-round-cols {
    flex-direction: column;
  }

  .air-timeline {
    padding-left: 20px;
    margin-left: 8px;
  }

  .air-timeline-node::before {
    left: -28px;
    width: 10px;
    height: 10px;
  }

  .air-hero {
    padding: 18px 20px;
  }
}

@media screen and (max-width: 480px) {
  body {
    font-size: 16px;
  }

  h1 {
    font-size: 24px;
  }

  .topbar-name {
    font-size: 14px;
  }

  .air-hero {
    padding: 14px var(--cp-space-md);
  }

  .air-hero-thesis {
    font-size: 15px;
  }

  .air-round-date {
    font-size: 11px;
  }

  .air-round-outcome {
    font-size: 12px;
  }
}