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

:root {
  --bg:          #ffffff;
  --bg-subtle:   #f6f8fa;
  --bg-code:     #f0f2f5;
  --border:      #e2e6ea;
  --text:        #1a202c;
  --text-muted:  #5a6475;
  --text-code:   #c7254e;
  --accent:      #F05340;
  --accent-dark: #d03f2e;
  --link:        #0969da;
  --sidebar-w:   260px;
  --topbar-h:    56px;
  --radius:      8px;
  --shadow:      0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:   0 4px 12px rgba(0,0,0,.1);
  --font-mono:   'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
  --font-sans:   'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --bg:         #0d1117;
  --bg-subtle:  #161b22;
  --bg-code:    #1e2530;
  --border:     #30363d;
  --text:       #e6edf3;
  --text-muted: #8b949e;
  --text-code:  #f47067;
  --link:       #58a6ff;
  --shadow:     0 1px 3px rgba(0,0,0,.3);
  --shadow-md:  0 4px 12px rgba(0,0,0,.4);
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  transition: background .15s, color .15s;
}

/* ============================================================
   Top Bar
   ============================================================ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  backdrop-filter: blur(8px);
}

.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 24px;
}

.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.topbar-links a {
  padding: 5px 12px;
  border-radius: 6px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color .15s, background .15s;
}

.topbar-links a:hover {
  color: var(--text);
  background: var(--bg-subtle);
}

.topbar-links .github-link {
  display: flex;
  align-items: center;
  gap: 6px;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color .15s, background .15s;
  flex-shrink: 0;
}

.theme-toggle:hover { background: var(--bg-subtle); color: var(--text); }
.theme-toggle .moon { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .moon { display: block; }

/* ============================================================
   Layout
   ============================================================ */
.layout {
  display: flex;
  padding-top: var(--topbar-h);
  max-width: 1400px;
  margin: 0 auto;
  min-height: 100vh;
}

/* ============================================================
   Sidebar
   ============================================================ */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  border-right: 1px solid var(--border);
  padding: 28px 0;
  scrollbar-width: thin;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sidebar-nav { padding: 0 12px; }

.nav-group { margin-bottom: 28px; }

.nav-group-title {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  padding: 0 12px;
  margin-bottom: 4px;
}

.nav-link {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color .15s, background .15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-link:hover { color: var(--text); background: var(--bg-subtle); }
.nav-link.active { color: var(--accent); background: rgba(240,83,64,.08); font-weight: 500; }

/* ============================================================
   Main Content
   ============================================================ */
.content {
  flex: 1;
  min-width: 0;
  padding: 48px 64px 80px;
  max-width: 900px;
}

/* ============================================================
   Typography
   ============================================================ */
.content h1 { font-size: 2.4rem; font-weight: 700; line-height: 1.2; margin-bottom: 16px; }
.content h2 { font-size: 1.65rem; font-weight: 700; margin-bottom: 12px; margin-top: 0; }
.content h3 { font-size: 1.1rem; font-weight: 600; margin: 28px 0 10px; }
.content p  { margin-bottom: 16px; }
.content ul { margin: 0 0 16px 20px; }
.content li { margin-bottom: 6px; }

code {
  font-family: var(--font-mono);
  font-size: .85em;
  background: var(--bg-code);
  color: var(--text-code);
  padding: 2px 6px;
  border-radius: 4px;
}

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

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

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

/* ============================================================
   Hero
   ============================================================ */
.hero { padding-bottom: 8px; }

.hero-logo {
  width: 160px;
  display: block;
  margin-bottom: 20px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(240,83,64,.1);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  margin-bottom: 18px;
  border: 1px solid rgba(240,83,64,.2);
}

.hero-title {
  font-size: 2.6rem !important;
  font-weight: 800 !important;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px !important;
}

[data-theme="dark"] .hero-title {
  background: linear-gradient(135deg, #e6edf3 0%, #8b949e 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 28px !important;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all .15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 3px rgba(240,83,64,.3);
}

.btn-primary:hover {
  background: var(--accent-dark);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(240,83,64,.3);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  text-decoration: none;
  color: var(--text);
}

/* ============================================================
   Feature Grid
   ============================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.feature-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow .15s, transform .15s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon { font-size: 1.5rem; margin-bottom: 10px; }

.feature-card h3 {
  font-size: .9rem;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--text);
}

.feature-card p {
  font-size: .8rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ============================================================
   Code Blocks
   ============================================================ */
.code-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-subtle);
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 11px;
  padding: 2px 8px;
  transition: all .15s;
  font-family: var(--font-sans);
}

.copy-btn:hover { background: var(--border); color: var(--text); }
.copy-btn.copied { background: #22c55e; border-color: #22c55e; color: #fff; }

.code-block pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  background: var(--bg-code);
}

.code-block pre code {
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.7;
  color: var(--text);
  background: none;
  padding: 0;
}

/* ============================================================
   Callouts
   ============================================================ */
.callout {
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 20px;
  font-size: .875rem;
  border-left: 4px solid;
}

.callout strong { font-weight: 600; }

.callout-info {
  background: rgba(14,99,173,.07);
  border-color: #0e63ad;
  color: var(--text);
}

[data-theme="dark"] .callout-info {
  background: rgba(88,166,255,.07);
  border-color: #58a6ff;
}

.callout-tip {
  background: rgba(34,197,94,.07);
  border-color: #22c55e;
  color: var(--text);
}

/* ============================================================
   Tables
   ============================================================ */
.table-wrapper { overflow-x: auto; margin-bottom: 20px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .875rem;
}

thead tr { background: var(--bg-subtle); }
th {
  padding: 10px 14px;
  text-align: left;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-subtle); }

/* ============================================================
   Badges
   ============================================================ */
.badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 2px 7px;
  border-radius: 20px;
  vertical-align: middle;
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.badge-recommended {
  background: rgba(240,83,64,.1);
  color: var(--accent);
  border-color: rgba(240,83,64,.2);
}

/* ============================================================
   HTTP Method Badges
   ============================================================ */
.method {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
}

.method-get  { background: rgba(34,197,94,.12);  color: #16a34a; }
.method-post { background: rgba(59,130,246,.12); color: #2563eb; }

[data-theme="dark"] .method-get  { color: #4ade80; }
[data-theme="dark"] .method-post { color: #60a5fa; }

/* ============================================================
   Flow Diagram
   ============================================================ */
.flow-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 28px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
}

.flow-step {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 20px;
  font-size: .85rem;
  text-align: center;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow);
}

.flow-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1;
}

.flow-row {
  display: flex;
  gap: 12px;
  width: 100%;
  flex-wrap: wrap;
  justify-content: center;
}

.flow-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 110px;
  max-width: 160px;
}

.flow-condition {
  font-size: .78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-align: center;
}

.flow-result {
  padding: 7px 14px;
  border-radius: 6px;
  font-size: .78rem;
  font-weight: 600;
  text-align: center;
  width: 100%;
}

.result-send { background: rgba(34,197,94,.12);  color: #16a34a; }
.result-queue { background: rgba(59,130,246,.12); color: #2563eb; }
.result-drop { background: rgba(239,68,68,.1);  color: #dc2626; }

[data-theme="dark"] .result-send  { color: #4ade80; }
[data-theme="dark"] .result-queue { color: #60a5fa; }
[data-theme="dark"] .result-drop  { color: #f87171; }

/* ============================================================
   API Reference
   ============================================================ */
.api-method {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 12px;
  background: var(--bg-subtle);
}

.api-signature {
  margin-bottom: 8px;
}

.api-signature code {
  font-size: .85rem;
  color: var(--text);
  background: none;
  padding: 0;
}

.api-method p {
  margin: 0;
  font-size: .875rem;
  color: var(--text-muted);
}

/* ============================================================
   Footer
   ============================================================ */
.page-footer {
  margin-top: 60px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  font-size: .8rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1100px) {
  .content { padding: 40px 40px 60px; }
}

/* ============================================================
   Mobile menu toggle button
   ============================================================ */
.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  color: var(--text-muted);
  align-items: center;
  justify-content: center;
  transition: color .15s, background .15s;
  flex-shrink: 0;
  order: -1;
}
.menu-toggle:hover { background: var(--bg-subtle); color: var(--text); }
.menu-toggle .icon-close { display: none; }
body.nav-open .menu-toggle .icon-menu  { display: none; }
body.nav-open .menu-toggle .icon-close { display: block; }

/* ============================================================
   Drawer overlay
   ============================================================ */
.drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 90;
  opacity: 0;
  transition: opacity .25s;
}
body.nav-open .drawer-overlay {
  display: block;
  opacity: 1;
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }

  /* Drawer: slide in from left */
  .sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    bottom: 0;
    height: calc(100vh - var(--topbar-h));
    width: 280px;
    z-index: 95;
    transform: translateX(-100%);
    transition: transform .25s cubic-bezier(.4,0,.2,1);
    border-right: 1px solid var(--border);
    background: var(--bg);
    box-shadow: none;
    overflow-y: auto;
  }
  body.nav-open .sidebar {
    transform: translateX(0);
    box-shadow: var(--shadow-md);
  }

  .content { padding: 32px 24px 60px; max-width: 100%; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 2rem !important; }
  .topbar-inner { padding: 0 12px; gap: 8px; }
  .topbar-links { gap: 2px; }
  .topbar-links a,
  .topbar-links .demo-link,
  .topbar-links .github-link { display: none !important; }
  .flow-row { flex-direction: column; align-items: center; }
  .flow-branch { max-width: 200px; }
}

@media (max-width: 480px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .btn { justify-content: center; }
}

/* ============================================================
   Syntax Highlighting (minimal, hand-rolled)
   ============================================================ */
.lang-php   .kw,
.lang-bash  .kw { color: #d73a49; }
[data-theme="dark"] .lang-php   .kw,
[data-theme="dark"] .lang-bash  .kw { color: #ff7b72; }

.lang-php .str { color: #032f62; }
[data-theme="dark"] .lang-php .str { color: #a5d6ff; }

/* ============================================================
   Live Demo elements
   ============================================================ */

/* Topbar demo link */
.topbar-links .demo-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 6px;
  background: rgba(240,83,64,.1);
  color: var(--accent) !important;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid rgba(240,83,64,.2);
  transition: background .15s;
}
.topbar-links .demo-link:hover { background: rgba(240,83,64,.18); }

/* Sidebar open demo button */
.nav-demo-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0 12px 4px;
  padding: 9px 14px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff !important;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: background .15s, transform .1s;
  box-shadow: 0 2px 6px rgba(240,83,64,.3);
}
.nav-demo-btn:hover {
  background: var(--accent-dark);
  text-decoration: none;
  color: #fff !important;
  transform: translateY(-1px);
}

/* Hero demo button */
.btn-demo {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  gap: 6px;
}
.btn-demo:hover {
  background: rgba(240,83,64,.07);
  text-decoration: none;
  color: var(--accent);
}

/* Demo banner */
.demo-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(240,83,64,.06) 0%, rgba(240,83,64,.02) 100%);
  border: 1.5px solid rgba(240,83,64,.25);
  border-radius: var(--radius);
  text-decoration: none;
  margin-bottom: 28px;
  transition: box-shadow .15s, transform .15s;
}
.demo-banner:hover {
  box-shadow: 0 4px 16px rgba(240,83,64,.15);
  transform: translateY(-2px);
  text-decoration: none;
}
.demo-banner-left { display: flex; align-items: center; gap: 16px; }

.demo-banner-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.demo-banner-badge::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: rgba(255,255,255,.7);
  border-radius: 50%;
  margin-right: 6px;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: .5; transform: scale(.8); }
}
.demo-banner-title {
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
  font-family: var(--font-mono);
}
.demo-banner-sub { font-size: .78rem; color: var(--text-muted); margin-top: 2px; }
.demo-banner-arrow { font-size: .9rem; font-weight: 600; color: var(--accent); white-space: nowrap; flex-shrink: 0; }

/* Status dots */
.status-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 5px;
  vertical-align: middle;
  position: relative; top: -1px;
}
.dot-green { background: #22c55e; }
.dot-red   { background: #ef4444; }

/* Demo feature list */
.demo-feature-list {
  display: flex;
  flex-direction: column;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.demo-feature {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
  transition: background .15s;
}
.demo-feature:last-child { border-bottom: none; }
.demo-feature:hover { background: var(--bg-subtle); }
.demo-feature-icon { font-size: 1.3rem; flex-shrink: 0; width: 28px; text-align: center; margin-top: 2px; }
.demo-feature strong { display: block; font-size: .9rem; margin-bottom: 3px; }
.demo-feature p { font-size: .82rem; color: var(--text-muted); margin: 0; line-height: 1.6; }

/* Scrollbar for main content */
html { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }