/* ==========================================================================
   Pika H3 Flex Unofficial Guide - Stylesheet
   Modern, responsive, high-contrast typography and layout
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Color Palette */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #1c2128;
  --bg-accent-subtle: rgba(56, 139, 253, 0.1);
  --bg-local-subtle: rgba(46, 160, 67, 0.12);
  --bg-cloud-subtle: rgba(163, 113, 247, 0.12);

  --border-default: #30363d;
  --border-muted: #21262d;
  --border-accent: #388bfd;
  --border-local: #2ea043;
  --border-cloud: #a371f7;
  --border-warning: #d29922;

  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --text-highlight: #ffffff;
  --text-link: #58a6ff;
  --text-link-hover: #79c0ff;

  --badge-local-text: #3fb950;
  --badge-cloud-text: #d2a8ff;
  --badge-warning-text: #e3b341;

  --container-max-width: 1120px;
  --header-height: 64px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.2s ease-in-out;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

code, pre, kbd {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-default);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-highlight);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.brand-logo:hover {
  text-decoration: none;
  opacity: 0.9;
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 6px;
}

.nav-link {
  display: block;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-highlight);
  background-color: var(--bg-secondary);
  text-decoration: none;
}

.nav-link.active {
  color: var(--text-highlight);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-default);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  padding: 8px;
  border-radius: var(--radius-md);
  cursor: pointer;
}

/* Mobile Nav Menu */
@media (max-width: 860px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-default);
    padding: 16px 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  }

  .main-nav.is-open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 8px;
  }

  .nav-link {
    padding: 10px 14px;
  }
}

/* Main Content */
.main-content {
  flex: 1;
  padding-top: 40px;
  padding-bottom: 60px;
}

/* Hero / Header Area */
.page-header {
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 2.2rem;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-highlight);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-header .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 800px;
  line-height: 1.5;
}

.meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-muted);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Direct Answer Box (Mandatory near top of each page) */
.direct-answer {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-accent);
  border-left: 5px solid var(--border-accent);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 36px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.direct-answer-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-link);
}

.direct-answer p {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text-highlight);
  margin-bottom: 8px;
}

.direct-answer p:last-child {
  margin-bottom: 0;
}

/* Callout Cards & Banners */
.callout {
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 24px 0;
  border-left: 4px solid var(--border-default);
  background-color: var(--bg-secondary);
  font-size: 0.95rem;
}

.callout-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.callout-warning {
  border-left-color: var(--border-warning);
  background-color: rgba(210, 153, 34, 0.08);
}
.callout-warning .callout-title {
  color: var(--badge-warning-text);
}

.callout-local {
  border-left-color: var(--border-local);
  background-color: var(--bg-local-subtle);
}
.callout-local .callout-title {
  color: var(--badge-local-text);
}

.callout-cloud {
  border-left-color: var(--border-cloud);
  background-color: var(--bg-cloud-subtle);
}
.callout-cloud .callout-title {
  color: var(--badge-cloud-text);
}

/* Content Sections */
.content-section {
  margin-bottom: 48px;
}

.content-section h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-highlight);
  letter-spacing: -0.015em;
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-muted);
}

.content-section h3 {
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 24px;
  margin-bottom: 12px;
}

.content-section p {
  margin-bottom: 16px;
  color: var(--text-primary);
}

.content-section ul, .content-section ol {
  margin-bottom: 18px;
  padding-left: 24px;
}

.content-section li {
  margin-bottom: 8px;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  vertical-align: middle;
}

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

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

.badge-status {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

thead {
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-default);
}

th {
  padding: 12px 16px;
  font-weight: 600;
  color: var(--text-highlight);
  white-space: nowrap;
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-muted);
  vertical-align: top;
  color: var(--text-primary);
}

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

tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

.table-footnote {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
  margin-bottom: 20px;
}

/* Grid & Cards */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: var(--transition);
}

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

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.15rem;
  color: var(--text-highlight);
}

.card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 12px;
}

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

/* Prompt Code Blocks & Copy Buttons */
.prompt-box {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  margin: 24px 0;
  overflow: hidden;
}

.prompt-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-default);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.copy-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.copy-btn:hover {
  color: var(--text-highlight);
  border-color: var(--border-accent);
  background-color: var(--bg-tertiary);
}

.copy-btn.copied {
  color: var(--badge-local-text);
  border-color: var(--border-local);
}

.prompt-content {
  padding: 16px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-highlight);
  background-color: #0b0f14;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}

.prompt-annotation {
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-muted);
  font-size: 0.84rem;
  color: var(--text-secondary);
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-default);
  background-color: var(--bg-secondary);
  padding: 36px 0;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.disclaimer-banner {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  list-style: none;
}

.footer-nav a {
  color: var(--text-secondary);
}

.footer-nav a:hover {
  color: var(--text-highlight);
}

/* Print Styles */
@media print {
  .site-header, .site-footer, .copy-btn, .nav-toggle {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
}