/* ============================================
   AMH SEO On-Page Documentation
   Stylesheet
   ============================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-surface-alt: #fafbfc;
  --color-border: #e1e4e8;
  --color-text: #1f2328;
  --color-text-muted: #57606a;
  --color-text-soft: #6e7781;
  --color-primary: #0b3d5e;
  --color-primary-hover: #082b44;
  --color-accent: #c5882e;
  --color-accent-soft: #fff8e6;
  --color-success: #1a7f37;
  --color-warning: #9a6700;
  --color-warning-bg: #fff8c5;
  --color-code-bg: #0d1117;
  --color-code-text: #e6edf3;
  --color-code-comment: #8b949e;
  --color-code-keyword: #ff7b72;
  --color-code-string: #a5d6ff;
  --color-code-tag: #7ee787;
  --color-code-attr: #d2a8ff;
  --color-code-punct: #c9d1d9;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-thai: "IBM Plex Sans Thai", "Sarabun", "Prompt", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-thai);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* SVG icon defaults (used via <use href>) */
.copy-btn svg,
.copy-btn-mini svg,
.sidebar-toggle svg,
.sidebar-close svg {
  display: inline-block;
  fill: currentColor;
  flex-shrink: 0;
}

.copy-btn svg { width: 14px; height: 14px; }
.copy-btn-mini svg { width: 12px; height: 12px; }
.sidebar-toggle svg { width: 18px; height: 18px; }
.sidebar-close svg { width: 18px; height: 18px; fill: none; stroke: currentColor; }
.sidebar-toggle .icon-open,
.sidebar-toggle .icon-close { fill: none; stroke: currentColor; }

/* Section 03 — full-width override so 4-key grid has room */
.info-grid-stack { grid-template-columns: 1fr !important; }
.info-card-wide { width: 100%; min-width: 0; }

/* Meta keys 4-item grid (Section 03) */
.meta-keys-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 10px;
  width: 100%;
}

@media (min-width: 640px) {
  .meta-keys-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.meta-key-item {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-text-soft);
  border-radius: var(--radius-sm);
  padding: 6px 6px 6px 10px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.meta-key-item:hover {
  border-color: var(--color-primary);
  border-left-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.meta-key-item.meta-key-primary {
  border-left-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.meta-key-item.meta-key-primary:hover { border-color: var(--color-accent); }

.meta-key-num {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #ffffff;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.meta-key-primary .meta-key-num {
  background: var(--color-accent);
  color: var(--color-primary);
}

.meta-key-item .path-code {
  flex: 1;
  min-width: 0;
  font-size: 12.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 4px 0;
}

.meta-key-item .copy-btn-mini { padding: 4px 9px; font-size: 11.5px; }

.copy-line-all {
  border: 1px dashed var(--color-primary);
  background: var(--color-surface-alt);
  margin-top: 4px;
}

.copy-line-all .path-code {
  color: var(--color-text-muted);
  font-style: italic;
  font-family: var(--font-thai);
  font-size: 12.5px;
}

/* ============================================
   Sidebar Toggle Button (fixed top-left)
   ============================================ */
.sidebar-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  cursor: pointer;
  font-family: var(--font-thai);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: background 0.18s, transform 0.18s, box-shadow 0.18s;
}

.sidebar-toggle:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.sidebar-toggle:active { transform: translateY(0); }

.sidebar-toggle svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-toggle .icon-close { display: none; }
body.sidebar-open .sidebar-toggle .icon-open { display: none; }
body.sidebar-open .sidebar-toggle .icon-close { display: block; }

.sidebar-toggle-label { white-space: nowrap; }

/* ============================================
   Sidebar overlay (mobile backdrop)
   ============================================ */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  z-index: 150;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

body.sidebar-open .sidebar-overlay {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 320px;
  max-width: 85vw;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.32, 0.72, 0.32, 1);
  z-index: 160;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

body.sidebar-open .sidebar { transform: translateX(0); }

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 22px 18px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #0a2d47 100%);
  color: #ffffff;
  border-bottom: 3px solid var(--color-accent);
}

.sidebar-header .toc-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #ffffff;
  margin: 0;
}

.sidebar-close {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.15s;
}

.sidebar-close:hover { background: rgba(255, 255, 255, 0.22); }
.sidebar-close svg { width: 18px; height: 18px; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.sidebar-nav::-webkit-scrollbar { width: 6px; }
.sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-list li { font-size: 14px; }

.toc-list a {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 14px;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  line-height: 1.4;
}

.toc-list a:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary);
  border-left-color: var(--color-accent);
}

.toc-list a.active {
  background: var(--color-accent-soft);
  color: var(--color-primary);
  border-left-color: var(--color-accent);
  font-weight: 600;
}

.toc-num {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-soft);
  background: var(--color-surface-alt);
  padding: 3px 7px;
  border-radius: 3px;
  letter-spacing: 0.02em;
  margin-top: 1px;
}

.toc-list a.active .toc-num {
  color: #ffffff;
  background: var(--color-primary);
}

.toc-text { display: block; font-size: 14px; }

.toc-text small {
  display: block;
  font-size: 11.5px;
  color: var(--color-text-soft);
  font-weight: 400;
  margin-top: 2px;
  letter-spacing: 0;
}

.sidebar-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  font-size: 12px;
  color: var(--color-text-soft);
  text-align: center;
}

.sidebar-footer kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--color-text);
}

/* ============================================
   Main Content
   ============================================ */
.main-content { padding: 96px 24px 56px; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

/* Intro section */
.intro {
  margin-bottom: 56px;
  border-left: 4px solid var(--color-primary);
}

.intro h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.intro p { margin-bottom: 14px; color: var(--color-text); }
.intro p:last-child { margin-bottom: 0; }

.intro a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent);
  font-weight: 500;
}

.intro a:hover { color: var(--color-primary-hover); }

.note {
  background: var(--color-accent-soft);
  border-left: 3px solid var(--color-accent);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14.5px;
  color: var(--color-text-muted);
}

.note strong { color: var(--color-text); }

.warning-line {
  background: var(--color-warning-bg);
  border-left: 3px solid var(--color-warning);
  padding: 12px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14.5px;
  color: var(--color-text);
  margin: 16px 0 24px;
}

.warning-line code {
  background: rgba(0, 0, 0, 0.08);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--color-text);
}

/* Section */
.page-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 120px;
}

.page-section-highlight {
  border-color: var(--color-primary);
  border-width: 2px;
}

.section-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding-bottom: 24px;
  margin-bottom: 28px;
  border-bottom: 2px solid var(--color-border);
}

.section-num {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  padding-top: 4px;
  letter-spacing: -0.02em;
}

.section-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}

.section-sub {
  font-size: 14px;
  color: var(--color-text-soft);
  font-weight: 400;
  font-style: italic;
}

.page-section h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  margin: 28px 0 14px;
  padding-left: 10px;
  border-left: 3px solid var(--color-accent);
}

.page-section h3:first-of-type { margin-top: 8px; }

/* Info grid */
.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 8px;
}

@media (min-width: 768px) {
  .info-grid { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }
}

.info-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  min-width: 0;
  overflow: hidden;
}

.info-label {
  display: block;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.copy-line {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px 6px 6px 12px;
  margin-bottom: 8px;
  transition: border-color 0.15s;
}

.copy-line:last-child { margin-bottom: 0; }
.copy-line:hover { border-color: var(--color-primary); }

.path-code {
  flex: 1 1 0;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text);
  white-space: nowrap;
  overflow-x: auto;
  padding: 4px 0;
  scrollbar-width: thin;
}

.path-code::-webkit-scrollbar { height: 6px; }
.path-code::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

.copy-btn-mini {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-thai);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
}

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

.copy-btn-mini.copied {
  background: var(--color-success);
  color: #ffffff;
  border-color: var(--color-success);
}

.copy-btn-mini svg { width: 12px; height: 12px; }

/* Instructions list */
.instruction-list {
  list-style: none;
  margin: 8px 0 24px;
}

.instruction-list li {
  position: relative;
  padding: 10px 0 10px 28px;
  font-size: 15px;
  border-bottom: 1px dashed var(--color-border);
}

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

.instruction-list li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 19px;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
}

.instruction-list strong { color: var(--color-primary); }

/* ============================================
   Code block (with copy button)
   ============================================ */
.code-block {
  background: var(--color-code-bg);
  border-radius: var(--radius-md);
  margin: 14px 0 28px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid #1f2937;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #161b22;
  padding: 10px 16px;
  border-bottom: 1px solid #21262d;
}

.code-lang {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: #8b949e;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid #30363d;
  color: #c9d1d9;
  font-family: var(--font-thai);
  font-size: 12.5px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
}

.copy-btn:hover {
  background: #21262d;
  border-color: #484f58;
  color: #ffffff;
}

.copy-btn.copied {
  background: #1a7f37;
  border-color: #1a7f37;
  color: #ffffff;
}

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

.code-block pre::-webkit-scrollbar { height: 8px; }
.code-block pre::-webkit-scrollbar-track { background: #0d1117; }
.code-block pre::-webkit-scrollbar-thumb {
  background: #30363d;
  border-radius: 4px;
}

.code-block pre code,
.code-block code {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: #f0f6fc;
  background: transparent;
  white-space: pre;
  display: block;
}

.code-block .token.tag { color: var(--color-code-tag); }
.code-block .token.attr-name { color: var(--color-code-attr); }
.code-block .token.attr-value,
.code-block .token.string { color: var(--color-code-string); }
.code-block .token.punctuation { color: var(--color-code-punct); }
.code-block .token.comment { color: var(--color-code-comment); font-style: italic; }
.code-block .token.keyword { color: var(--color-code-keyword); }

/* Figure / images */
.section-figure {
  margin: 24px 0;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.section-figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  display: block;
  margin: 0 auto;
}

.section-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--color-text-soft);
  font-style: italic;
}

.section-figure-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  background: transparent;
  border: none;
  padding: 0;
}

@media (min-width: 768px) {
  .section-figure-grid { grid-template-columns: repeat(3, 1fr); }
}

.section-figure-grid > div {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: center;
}

/* Score line */
.score-line {
  margin-top: 28px;
  padding: 14px 18px;
  background: linear-gradient(135deg, #f0f8f4 0%, #e6f4ec 100%);
  border-left: 3px solid var(--color-success);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  color: var(--color-text);
}

.score-badge {
  display: inline-block;
  background: var(--color-success);
  color: #ffffff;
  font-weight: 700;
  font-size: 12.5px;
  padding: 3px 10px;
  border-radius: 12px;
  margin-right: 8px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.sub-page {
  margin: 20px 0;
  padding: 18px 22px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.sub-page h3 {
  margin-top: 0 !important;
  margin-bottom: 12px !important;
  font-size: 16px;
}

.closing-note {
  margin-top: 32px;
  text-align: center;
  font-size: 15px;
  background: var(--color-surface-alt);
  border-left: none;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

/* Footer */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: 36px 0;
  text-align: center;
  margin-top: 48px;
}

.site-footer p { font-size: 14px; }
.site-footer .footer-sub {
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 12.5px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--color-text);
  color: #ffffff;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 9999;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 720px) {
  .page-section { padding: 24px 20px; }
  .section-header { gap: 14px; }
  .section-num { font-size: 26px; }
  .section-header h2 { font-size: 20px; }
  .main-content { padding: 80px 0 32px; }
  .container { padding: 0 16px; }
  .code-block code { font-size: 12.5px; }
  .sidebar-toggle { padding: 8px 12px; font-size: 13px; top: 14px; left: 14px; }
  .sidebar-toggle-label { display: none; }
  .sidebar-toggle svg { width: 20px; height: 20px; }
}

@media print {
  body { background: #ffffff; }
  .sidebar, .sidebar-toggle, .sidebar-overlay, .copy-btn, .copy-btn-mini, .toast { display: none !important; }
  .page-section, .card { box-shadow: none; border: 1px solid #ccc; page-break-inside: avoid; }
  .main-content { padding-top: 24px !important; }
}

/* SEO Meta tag display card */
.seo-meta-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin: 12px 0 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  overflow: hidden;
}

.seo-meta-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.seo-meta-label {
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.seo-meta-label::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
}