/* ==========================================================================
   mdbindery — Editorial Bookbinding + Developer CLI Precision Stylesheet
   Zero external dependencies. WCAG 2.2 AA contrast verified in dark & light.
   ========================================================================== */

:root {
  --bg-primary: #111110;
  --bg-secondary: #181816;
  --bg-tertiary: #20201d;
  --bg-code: #0b0b0a;
  --bg-glass: rgba(17, 17, 16, 0.9);

  --text-primary: #f5f3ec;
  --text-secondary: #c2bfb5;
  --text-muted: #9e9b90;

  --accent: #e08263;
  --accent-hover: #ec9679;
  --accent-solid: #e08263;
  --accent-solid-hover: #ec9679;
  --accent-fg: #111110;
  --accent-subtle: rgba(224, 130, 99, 0.14);
  --accent-border: rgba(224, 130, 99, 0.45);

  --border: #2a2a25;
  --border-strong: #3b3b34;

  --status-pass: #5ec279;
  --status-pass-bg: rgba(94, 194, 121, 0.14);
  --status-warn: #ebb052;
  --status-warn-bg: rgba(235, 176, 82, 0.14);
  --status-err: #f07565;
  --status-err-bg: rgba(240, 117, 101, 0.14);
  --status-info: #7ab3e8;
  --status-info-bg: rgba(122, 179, 232, 0.14);

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 12px 32px -8px rgba(0, 0, 0, 0.45);
  --max-w: 1180px;
}

[data-theme="light"] {
  --bg-primary: #faf8f3;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1ede4;
  --bg-code: #161614;
  --bg-glass: rgba(250, 248, 243, 0.92);

  --text-primary: #181816;
  --text-secondary: #43413b;
  --text-muted: #5c5951;

  --accent: #a63e1e;
  --accent-hover: #8c3216;
  --accent-solid: #a63e1e;
  --accent-solid-hover: #8c3216;
  --accent-fg: #ffffff;
  --accent-subtle: rgba(166, 62, 30, 0.1);
  --accent-border: rgba(166, 62, 30, 0.35);

  --border: #dfd9cc;
  --border-strong: #c7c0b0;

  --status-pass: #1e6b34;
  --status-pass-bg: rgba(30, 107, 52, 0.12);
  --status-warn: #8a5604;
  --status-warn-bg: rgba(138, 86, 4, 0.12);
  --status-err: #b02515;
  --status-err-bg: rgba(176, 37, 21, 0.12);
  --status-info: #18568c;
  --status-info-bg: rgba(24, 86, 140, 0.12);

  --shadow-card: 0 10px 28px -8px rgba(24, 24, 22, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
}

section[id] {
  scroll-margin-top: 5rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  background: var(--accent-solid);
  color: var(--accent-fg);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code,
pre,
kbd {
  font-family: var(--font-mono);
}

code {
  font-size: 0.88em;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
  overflow-wrap: anywhere;
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: 0.875rem;
  overflow-wrap: normal;
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
  gap: 0.75rem 1rem;
  flex-wrap: wrap;
  padding-top: 0.45rem;
  padding-bottom: 0.45rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  flex-shrink: 0;
}

.version-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem 1.1rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.llm-pill-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  padding: 0.32rem 0.65rem;
  border-radius: var(--radius-sm);
}

.llm-pill-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1.05rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-solid);
  color: var(--accent-fg);
}

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

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

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

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
}

.hero-eyebrow {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 4.5vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 18ch;
}

.hero-lead {
  font-size: clamp(1.02rem, 1.8vw, 1.22rem);
  color: var(--text-secondary);
  max-width: 68ch;
  margin: 0 0 2rem;
}

.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 2.75rem;
}

.hero-showcase {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 1.5rem;
  align-items: stretch;
}

/* Terminal & Code Window */
.code-window {
  background: var(--bg-code);
  color: #f5f3ec;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.code-window-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.6rem 1rem;
  background: #161614;
  border-bottom: 1px solid #2b2b26;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #b5b2a8;
}

.window-dots {
  display: inline-flex;
  gap: 6px;
}

.window-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #3a3a34;
}

.window-dots span:first-child {
  background: #e08263;
}

.code-window pre {
  margin: 0;
  padding: 1.15rem 1.25rem;
  overflow-x: auto;
  line-height: 1.6;
  font-size: 0.85rem;
}

.cmd-prompt {
  color: #a8a59b;
  user-select: none;
}

.cmd-comment {
  color: #a8a59b;
}

.cmd-ok {
  color: #6fd18a;
  font-weight: 600;
}

.cmd-accent {
  color: #ec9679;
}

/* E-Reader Transformation Card */
.ereader-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.4rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}

.ereader-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.6rem;
  margin-bottom: 0.9rem;
}

.ereader-page {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.55;
}

.ereader-page h2 {
  font-size: 1.2rem;
  margin: 0 0 0.5rem;
}

.ereader-page p {
  margin: 0 0 0.75rem;
  color: var(--text-secondary);
}

.ereader-card-table {
  font-family: var(--font-sans);
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  margin-bottom: 0.8rem;
  font-size: 0.82rem;
}

.ereader-card-table div {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.12rem 0;
}

.ereader-refs {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  border-top: 1px solid var(--border);
  padding-top: 0.6rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Section Layout & Typography
   ========================================================================== */

.section {
  padding: 4.25rem 0;
  border-bottom: 1px solid var(--border);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.4rem;
  display: block;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 70ch;
  margin: 0;
  font-size: 1.04rem;
}

/* ==========================================================================
   Feature Grid
   ========================================================================== */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  transition: border-color 0.15s ease;
}

.feature-card:hover {
  border-color: var(--border-strong);
}

.feature-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.08rem;
  margin: 0 0 0.5rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Interactive Install Tabs (Progressive Enhancement: all visible if JS off)
   ========================================================================== */

.tabs-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  padding: 0.35rem 0.5rem 0;
  gap: 0.25rem;
}

.tab-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
  border-bottom: none;
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  cursor: pointer;
}

.tab-btn[aria-selected="true"] {
  background: var(--bg-secondary);
  color: var(--accent);
  border-color: var(--border);
}

.tab-panel {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.tab-panel:last-child {
  border-bottom: none;
}

.tab-panel[hidden] {
  display: none;
}

.tab-panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--text-primary);
}

.code-block-wrap {
  position: relative;
  background: var(--bg-code);
  color: #f5f3ec;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  margin: 0.75rem 0 1rem;
}

.code-block-wrap pre {
  margin: 0;
  padding: 1rem 5.5rem 1rem 1.15rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.55;
}

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  background: #252521;
  color: #f5f3ec;
  border: 1px solid #47473f;
  border-radius: 4px;
  padding: 0.28rem 0.6rem;
  cursor: pointer;
}

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

/* ==========================================================================
   7 Build Gates Pipeline
   ========================================================================== */

.gates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.gate-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 3px solid var(--status-pass);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.2rem;
}

.gate-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}

.gate-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.12rem 0.48rem;
  border-radius: 999px;
  text-transform: uppercase;
}

.badge-pass {
  color: var(--status-pass);
  background: var(--status-pass-bg);
}

.badge-warn {
  color: var(--status-warn);
  background: var(--status-warn-bg);
}

.badge-error {
  color: var(--status-err);
  background: var(--status-err-bg);
}

.badge-info {
  color: var(--status-info);
  background: var(--status-info-bg);
}

.gate-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   AI Agents & LLM Hub
   ========================================================================== */

.agent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.agent-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.agent-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.agent-card p {
  color: var(--text-secondary);
  font-size: 0.93rem;
  margin: 0 0 1rem;
}

.endpoints-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.2rem;
}

.endpoint-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  margin-bottom: 0.2rem;
}

.endpoint-item span {
  font-size: 0.83rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Interactive Check Codes Explorer & Tables
   ========================================================================== */

.filter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-md);
}

.search-input {
  flex: 1 1 240px;
  min-width: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  font-family: var(--font-sans);
}

.filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.filter-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.38rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
}

.filter-pill[aria-pressed="true"] {
  background: var(--accent-solid);
  color: var(--accent-fg);
  border-color: var(--accent-solid);
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
}

.table-scroll-limited {
  max-height: 540px;
  overflow-y: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

thead th {
  position: sticky;
  top: 0;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-strong);
  z-index: 2;
}

tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

tbody tr:last-child td {
  border-bottom: none;
}

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

/* ==========================================================================
   Config & Two-Column Split
   ========================================================================== */

.split-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.5rem;
  align-items: start;
}

.split-grid > * {
  min-width: 0;
}

/* ==========================================================================
   Documentation Cards & FAQ
   ========================================================================== */

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

.doc-link-card {
  display: block;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.15rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: border-color 0.15s ease;
}

.doc-link-card:hover {
  border-color: var(--accent);
}

.doc-link-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--accent);
}

.doc-link-card p {
  margin: 0;
  font-size: 0.87rem;
  color: var(--text-secondary);
}

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.95rem 1.2rem;
}

.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
}

.faq-item p {
  margin: 0.75rem 0 0;
  color: var(--text-secondary);
  font-size: 0.93rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding: 3rem 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}

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

@media (max-width: 920px) {
  .site-header {
    position: static;
  }
  section[id] {
    scroll-margin-top: 1rem;
  }
  .hero-showcase,
  .split-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 1rem;
  }
  .hero {
    padding: 2.5rem 0 2rem;
  }
  .section {
    padding: 2.75rem 0;
  }
  .code-block-wrap pre {
    padding-right: 1rem;
    padding-top: 2.6rem;
  }
}