/* ══════════════════════════════════════════════
   Propel Documentation — Furo-inspired Layout
   ══════════════════════════════════════════════ */

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

:root {
  --font-sans: "Noto Sans", Arial, Helvetica, sans-serif;
  --font-mono: "Noto Sans Mono", "Courier New", monospace;

  /* Colors — matches main site */
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #555;
  --color-light: #6b7280;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #dbeafe;
  --color-accent-bg: #eff6ff;
  --color-border: #e5e7eb;
  --color-code-bg: #f8f9fa;
  --color-sidebar-bg: #fafafa;
  --color-sidebar-active: #f0f4ff;

  /* Mode colors */
  --color-researcher: #8b5cf6;
  --color-engineer: #2563eb;
  --color-debugger: #dc2626;
  --color-trainer: #10b981;

  /* Layout */
  --sidebar-width: 280px;
  --toc-width: 220px;
  --content-max: 800px;
  --header-height: 56px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
  font-size: 16px;
}

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

/* ── Top Header Bar ── */
.docs-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: #0a0a0a;
  color: #fff;
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  z-index: 100;
  border-bottom: 1px solid #222;
}

.docs-header-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.docs-header-logo:hover {
  text-decoration: none;
  color: #fff;
}

.docs-header-logo img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.docs-header-logo .logo-tag {
  font-size: 0.7rem;
  font-weight: 400;
  color: #888;
  margin-left: 0.25rem;
}

.docs-header-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.docs-header-nav a {
  color: #999;
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 0.2s;
}

.docs-header-nav a:hover {
  color: #fff;
  text-decoration: none;
}

.docs-header-search {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 6px;
  padding: 0.3rem 0.75rem;
  color: #666;
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color 0.2s;
  margin-left: 1rem;
}

.docs-header-search:hover {
  border-color: #555;
}

.docs-header-search svg {
  width: 14px;
  height: 14px;
  opacity: 0.5;
}

.docs-header-search kbd {
  background: #222;
  border: 1px solid #444;
  border-radius: 3px;
  padding: 0.05rem 0.35rem;
  font-size: 0.7rem;
  font-family: var(--font-sans);
  color: #777;
  margin-left: 1.5rem;
}

/* ── Mobile sidebar toggle ── */
.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: #999;
  cursor: pointer;
  padding: 0.25rem;
  margin-right: 0.5rem;
}

.sidebar-toggle svg {
  width: 20px;
  height: 20px;
}

/* ── Three-column Layout ── */
.docs-layout {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* ── Left Sidebar ── */
.docs-sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  padding: 1.5rem 0;
  z-index: 50;
}

.docs-sidebar::-webkit-scrollbar {
  width: 4px;
}

.docs-sidebar::-webkit-scrollbar-thumb {
  background: #ddd;
  border-radius: 2px;
}

/* Sidebar nav structure */
.sidebar-section {
  margin-bottom: 0.25rem;
}

.sidebar-heading {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  padding: 0.75rem 1.5rem 0.35rem;
}

.sidebar-link {
  display: block;
  font-size: 0.85rem;
  color: var(--color-light);
  padding: 0.3rem 1.5rem;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all 0.15s;
  line-height: 1.5;
}

.sidebar-link:hover {
  color: var(--color-text);
  background: #f0f0f0;
  text-decoration: none;
}

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

.sidebar-link.sub {
  padding-left: 2.5rem;
  font-size: 0.82rem;
}

.sidebar-link.sub-2 {
  padding-left: 3.25rem;
  font-size: 0.8rem;
}

.sidebar-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0.75rem 1.5rem;
}

/* ── Main Content ── */
.docs-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  margin-right: var(--toc-width);
  padding: 2rem 3rem 4rem;
  max-width: calc(var(--content-max) + 6rem);
  min-width: 0;
}

/* ── Right Sidebar (On This Page) ── */
.docs-toc {
  position: fixed;
  top: var(--header-height);
  right: 0;
  bottom: 0;
  width: var(--toc-width);
  padding: 2rem 1.25rem;
  overflow-y: auto;
  border-left: 1px solid var(--color-border);
}

.docs-toc-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.docs-toc a {
  display: block;
  font-size: 0.8rem;
  color: var(--color-light);
  padding: 0.2rem 0;
  padding-left: 0.75rem;
  border-left: 2px solid transparent;
  text-decoration: none;
  line-height: 1.5;
  transition: all 0.15s;
}

.docs-toc a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.docs-toc a.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.docs-toc a.toc-h3 {
  padding-left: 1.5rem;
  font-size: 0.78rem;
}

/* ── Breadcrumbs ── */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--color-light);
  margin-bottom: 1.5rem;
}

.breadcrumbs a {
  color: var(--color-light);
  text-decoration: none;
}

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

.breadcrumbs .sep {
  color: #ccc;
  font-size: 0.7rem;
}

/* ── Page Title ── */
.page-title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  border-bottom: none;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* ── Typography ── */
h2 {
  font-size: 1.45rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.35rem;
  line-height: 1.6;
}

/* ── Code ── */
code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: #c7254e;
}

pre {
  background: #1a1a1a;
  color: #e2e8f0;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  line-height: 1.6;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ── Blockquotes ── */
blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.75rem 1rem;
  margin: 1rem 0 1.25rem;
  color: var(--color-muted);
  background: var(--color-accent-bg);
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

/* ── Tables ── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.88rem;
}

th, td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  background: var(--color-code-bg);
  font-size: 0.84rem;
}

/* ── Admonition / Callout Boxes ── */
.admonition {
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  border-left: 4px solid;
  font-size: 0.92rem;
}

.admonition-title {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
}

.admonition.note {
  background: var(--color-accent-bg);
  border-left-color: var(--color-accent);
}
.admonition.note .admonition-title { color: var(--color-accent); }

.admonition.warning {
  background: #fffbeb;
  border-left-color: #f59e0b;
}
.admonition.warning .admonition-title { color: #b45309; }

.admonition.danger {
  background: #fef2f2;
  border-left-color: #dc2626;
}
.admonition.danger .admonition-title { color: #dc2626; }

.admonition.tip {
  background: #ecfdf5;
  border-left-color: #10b981;
}
.admonition.tip .admonition-title { color: #059669; }

/* ── Cards Grid (for landing page) ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}

.doc-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.doc-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(37, 99, 235, 0.08);
  text-decoration: none;
}

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

.doc-card p {
  font-size: 0.88rem;
  color: var(--color-muted);
  margin-bottom: 0;
  line-height: 1.5;
}

/* ── Mode Badge ── */
.mode-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-right: 0.25rem;
}

.mode-badge.researcher { background: #f5f3ff; color: var(--color-researcher); }
.mode-badge.engineer { background: #eff6ff; color: var(--color-engineer); }
.mode-badge.debugger { background: #fef2f2; color: var(--color-debugger); }
.mode-badge.trainer { background: #ecfdf5; color: var(--color-trainer); }

/* ── Gate Indicator ── */
.gate-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

/* ── Workflow Steps ── */
.workflow-steps {
  counter-reset: wf-step;
  margin: 1.5rem 0;
}

.workflow-step {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}

.workflow-step::before {
  counter-increment: wf-step;
  content: counter(wf-step);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  font-weight: 600;
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.workflow-step-content {
  flex: 1;
}

.workflow-step-content h4 {
  margin-top: 0;
  margin-bottom: 0.25rem;
}

.workflow-step-content p {
  font-size: 0.92rem;
  margin-bottom: 0.35rem;
}

/* ── Prev / Next Navigation ── */
.docs-pager {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  gap: 1rem;
}

.docs-pager a {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
  transition: border-color 0.2s;
  min-width: 0;
  max-width: 48%;
}

.docs-pager a:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

.docs-pager .pager-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin-bottom: 0.15rem;
}

.docs-pager .pager-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
}

.docs-pager .next {
  margin-left: auto;
  text-align: right;
}

/* ── Footer ── */
.docs-footer {
  margin-top: 3rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-light);
  font-size: 0.8rem;
}

.docs-footer a {
  color: var(--color-light);
}

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

/* ── Landing Page Specific ── */
.landing-hero {
  text-align: center;
  padding: 1rem 0 2rem;
}

.landing-hero .logo-large {
  width: 80px;
  height: 80px;
  border-radius: 18px;
  margin-bottom: 1rem;
}

.landing-hero h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  border-bottom: none;
}

.landing-hero p {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 550px;
  margin: 0 auto;
  line-height: 1.6;
}

.section-intro {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

/* ── Responsive ── */
@media (max-width: 1200px) {
  .docs-toc {
    display: none;
  }
  .docs-content {
    margin-right: 0;
  }
}

@media (max-width: 900px) {
  .sidebar-toggle {
    display: block;
  }

  .docs-sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 90;
    background: #fff;
  }

  .docs-sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,0.1);
  }

  .docs-content {
    margin-left: 0;
    padding: 1.5rem 1.25rem 3rem;
  }

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

  .docs-header-search {
    display: none;
  }
}

@media (max-width: 600px) {
  .page-title {
    font-size: 1.6rem;
  }

  .docs-pager {
    flex-direction: column;
  }

  .docs-pager a {
    max-width: 100%;
  }
}