/* === Custom Properties === */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-code-bg: #2d2d2d;
  --color-code-header: #252526;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --max-width: 960px;
  --nav-height: 56px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 0.85rem;
}

/* === Container === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Nav === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 100%;
  gap: 32px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  white-space: nowrap;
}
.nav-logo:hover { text-decoration: none; color: var(--color-accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--color-accent); text-decoration: none; }

.nav-toggle-input { display: none; }
.nav-toggle { display: none; }

/* === Hero === */
.hero {
  padding: 80px 0 64px;
  text-align: center;
}

.hero h1 {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.hero .accent { color: var(--color-accent); }

.hero-tagline {
  font-size: 1.35rem;
  color: var(--color-text-muted);
  margin-top: 12px;
}

.badge {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  margin-top: 16px;
  letter-spacing: 0.02em;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.hero-sub {
  max-width: 640px;
  margin: 32px auto 0;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-hover); }

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

/* === Sections === */
.section { padding: 72px 0; }
.section-alt { background: var(--color-bg-alt); }

.section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  text-align: center;
}

.section-intro {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
}

/* === Quick Start Steps === */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.step {
  text-align: center;
  padding: 24px 16px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.step h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* === Code Blocks === */
.code-block {
  background: var(--color-code-bg);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 24px;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--color-code-header);
  color: #999;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.copy-btn {
  background: transparent;
  border: 1px solid #555;
  color: #999;
  padding: 3px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  font-family: var(--font-body);
  transition: all 0.15s ease;
}
.copy-btn:hover { border-color: #999; color: #ccc; }
.copy-btn.copied { border-color: #4ade80; color: #4ade80; }

.code-block pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
}

.code-block pre code {
  font-size: 0.82rem;
  line-height: 1.5;
  color: #ccc;
}

/* === Features === */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  text-align: center;
  padding: 32px 24px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-bg);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* === Schema Grid === */
.schema-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.schema-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  overflow: hidden;
}

.schema-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
}

.schema-card-header h3 {
  font-size: 0.95rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chevron {
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.schema-card.collapsed .chevron {
  transform: rotate(-45deg);
}

.schema-card-body {
  padding: 0 16px 14px;
  transition: max-height 0.2s ease;
}

.schema-card.collapsed .schema-card-body {
  display: none;
}

.schema-card-body ul {
  list-style: none;
  font-size: 0.85rem;
}

.schema-card-body li {
  padding: 3px 0;
  color: var(--color-text-muted);
}

.schema-card-body li code {
  color: var(--color-text);
  font-size: 0.8rem;
}

.schema-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 8px;
  font-style: italic;
}

.badge-sm {
  font-size: 0.65rem;
  padding: 1px 6px;
  border-radius: 8px;
  margin-top: 0;
  vertical-align: middle;
}

.badge-required {
  background: #dc2626;
}

/* === Tabs === */
.tab-buttons {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 24px;
}

.tab-btn {
  background: none;
  border: none;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s ease;
  font-family: var(--font-body);
}

.tab-btn:hover { color: var(--color-text); }
.tab-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.example-desc {
  margin-bottom: 16px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* === Spec Blocks === */
.spec-block {
  margin-bottom: 40px;
}

.spec-block h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.spec-block ul {
  margin: 12px 0;
  padding-left: 24px;
}

.spec-block li {
  margin-bottom: 6px;
  font-size: 0.95rem;
}

/* === Table === */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 12px 0;
}

thead { background: var(--color-bg); }
th { text-align: left; font-weight: 600; }
th, td {
  padding: 10px 16px;
  border: 1px solid var(--color-border);
}

/* === Adopt === */
.adopt-steps { margin-bottom: 32px; }

.adopt-step {
  margin-bottom: 24px;
}

.adopt-step h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.server-configs {
  display: grid;
  gap: 16px;
  margin-bottom: 32px;
}

/* === Community === */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.community-card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
}

.community-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.community-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.community-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* === Footer === */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left, .footer-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-text);
}

.footer-sep { color: var(--color-border); }

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

/* === Utilities === */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

/* === Responsive: Tablet === */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .hero-tagline { font-size: 1.1rem; }

  .steps { grid-template-columns: repeat(2, 1fr); }
  .features { grid-template-columns: 1fr; }
  .schema-grid { grid-template-columns: repeat(2, 1fr); }
  .community-grid { grid-template-columns: 1fr; }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    margin-left: auto;
    padding: 4px;
  }

  .nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: all 0.2s ease;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 12px;
  }

  .nav-toggle-input:checked ~ .nav-links {
    display: flex;
  }

  .nav-toggle-input:checked ~ .nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle-input:checked ~ .nav-toggle span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle-input:checked ~ .nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .footer-inner { flex-direction: column; text-align: center; }
}

/* === Responsive: Mobile === */
@media (max-width: 480px) {
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 2rem; }
  .section { padding: 48px 0; }
  .steps { grid-template-columns: 1fr; }
  .schema-grid { grid-template-columns: 1fr; }
  .tab-btn { padding: 8px 12px; font-size: 0.85rem; }
}