:root {
  --bg: #fbf6f6;
  --bg-alt: #f5eae9;
  --panel: #ffffff;
  --text: #201717;
  --text-dim: #5a4c4c;
  --muted: #8c7c7c;
  --border: #ecd8d7;
  --accent: #dc2626;
  --accent-hover: #b91c1c;
  --accent-contrast: #ffffff;
  --code-bg: rgba(220, 38, 38, 0.08);
  --code-text: #9f1239;
  --hero-glow: rgba(220, 38, 38, 0.10);
  --header-bg: rgba(250, 250, 250, 0.92);
  --mobile-nav-bg: rgba(255, 255, 255, 0.98);
  --max-width: 1100px;
  --label-added-bg: rgba(52, 199, 89, 0.15);   --label-added-fg: #1f8f44;
  --label-changed-bg: rgba(37, 99, 235, 0.14); --label-changed-fg: #1a56b0;
  --label-fixed-bg: rgba(184, 106, 0, 0.14);   --label-fixed-fg: #a35e00;
  --label-removed-bg: rgba(200, 40, 40, 0.14); --label-removed-fg: #b3312f;
  --label-breaking-bg: rgba(200, 40, 40, 0.18);--label-breaking-fg: #b3312f;
  --label-security-bg: rgba(184, 106, 0, 0.14);--label-security-fg: #a35e00;
  --error-fg: #b3312f;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1414; --bg-alt: #201818; --panel: #251c1c; --text: #f5efee;
    --text-dim: #c4a9a9; --muted: #8c7373; --border: #3a2a2a;
    --accent: #f87171; --accent-hover: #fca5a5; --accent-contrast: #18181b;
    --code-bg: rgba(248, 113, 113, 0.12); --code-text: #fca5a5;
    --hero-glow: rgba(248, 113, 113, 0.10);
    --header-bg: rgba(15, 15, 16, 0.92); --mobile-nav-bg: rgba(15, 15, 16, 0.98);
    --label-added-bg: rgba(52, 199, 89, 0.15);   --label-added-fg: #5de08a;
    --label-changed-bg: rgba(96, 165, 250, 0.18);--label-changed-fg: #8ab4f8;
    --label-fixed-bg: rgba(255, 179, 71, 0.15);  --label-fixed-fg: #ffbe6a;
    --label-removed-bg: rgba(255, 69, 69, 0.15); --label-removed-fg: #f28b82;
    --label-breaking-bg: rgba(255, 69, 69, 0.2); --label-breaking-fg: #f28b82;
    --label-security-bg: rgba(255, 179, 71, 0.15);--label-security-fg: #ffbe6a;
    --error-fg: #d98c8c;
  }
}
:root[data-theme="dark"] {
  --bg: #1a1414; --bg-alt: #201818; --panel: #251c1c; --text: #f5efee;
  --text-dim: #c4a9a9; --muted: #8c7373; --border: #3a2a2a;
  --accent: #f87171; --accent-hover: #fca5a5; --accent-contrast: #18181b;
  --code-bg: rgba(248, 113, 113, 0.12); --code-text: #fca5a5;
  --hero-glow: rgba(248, 113, 113, 0.10);
  --header-bg: rgba(15, 15, 16, 0.92); --mobile-nav-bg: rgba(15, 15, 16, 0.98);
  --label-added-bg: rgba(52, 199, 89, 0.15);   --label-added-fg: #5de08a;
  --label-changed-bg: rgba(96, 165, 250, 0.18);--label-changed-fg: #8ab4f8;
  --label-fixed-bg: rgba(255, 179, 71, 0.15);  --label-fixed-fg: #ffbe6a;
  --label-removed-bg: rgba(255, 69, 69, 0.15); --label-removed-fg: #f28b82;
  --label-breaking-bg: rgba(255, 69, 69, 0.2); --label-breaking-fg: #f28b82;
  --label-security-bg: rgba(255, 179, 71, 0.15);--label-security-fg: #ffbe6a;
  --error-fg: #d98c8c;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; color-scheme: light dark; }
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

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

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

h2 { font-size: 1.8rem; margin: 0 0 24px; }
h3 { font-size: 1.1rem; margin: 0 0 8px; }

code {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Dev-mode banner - hidden by default, revealed by dev-config.js (see
   dev-server.py) when running locally via dev-server.sh/.bat. Same
   env-banner treatment as TIGHC/Stuxs.Tools - fixed colors, not theme
   tokens, since it's a deliberately loud, theme-independent alert bar. */
.env-banner { display: flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.4rem 1rem; text-align: center; flex-wrap: wrap; }
.env-banner[hidden] { display: none; }
.env-banner a { color: inherit; text-decoration: underline; }
.env-banner-title { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.72rem; font-weight: 700; line-height: 1.3; }
.env-banner-detail { display: block; font-size: 0.65rem; font-weight: 500; opacity: 0.85; line-height: 1.3; }
.env-banner-dev { background: #F59E0B; color: #1A1200; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--header-bg);
  backdrop-filter: blur(6px);
  z-index: 10;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; }
.brand { display: flex; align-items: center; color: var(--text); }
.brand:hover { color: var(--text); text-decoration: none; }
.brand-logo { height: 30px; width: auto; display: block; }
.site-nav { display: flex; gap: 20px; align-items: center; }
.site-nav a { color: var(--text-dim); font-size: 0.95rem; }
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a.active { color: var(--text); }
.nav-gh {
  display: inline-flex; align-items: center; gap: 7px;
  color: #fff !important; background: var(--accent);
  border: 1px solid var(--accent); padding: 6px 14px; border-radius: 6px;
}
.nav-gh:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.header-controls { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 6px; border: 1px solid var(--border);
  background: none; color: var(--text-dim); cursor: pointer; flex-shrink: 0; font-size: 1rem;
}
.theme-toggle:hover { color: var(--text); border-color: var(--accent); }
.theme-toggle i { display: none; }
:root[data-theme="dark"] .theme-toggle .fa-sun { display: inline; }
:root[data-theme="light"] .theme-toggle .fa-moon { display: inline; }
:root:not([data-theme]) .theme-toggle .fa-moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .fa-sun { display: inline; }
  :root:not([data-theme]) .theme-toggle .fa-moon { display: none; }
}

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
  width: 32px; height: 32px; flex-shrink: 0;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text);
  border-radius: 2px; transition: transform 0.2s, opacity 0.2s; transform-origin: center;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero {
  padding: 72px 0 48px;
  text-align: center;
  background: radial-gradient(ellipse at top, var(--hero-glow), transparent 60%);
}
.hero-logo { max-width: 420px; width: 100%; margin-bottom: 28px; }
.hero-tagline { font-size: 1.3rem; font-weight: 600; margin: 0 auto 12px; max-width: 760px; }
.hero-sub { color: var(--text-dim); max-width: 580px; margin: 0 auto 28px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 22px; }
.hero-meta { margin-bottom: 4px; }

.badge {
  display: inline-block; background: var(--panel); border: 1px solid var(--border);
  color: var(--text-dim); font-size: 0.8rem; padding: 4px 10px; border-radius: 999px; margin: 0 4px;
}

.btn { display: inline-block; padding: 11px 22px; border-radius: 8px; font-weight: 600; font-size: 0.95rem; border: 1px solid transparent; }
.btn:hover { text-decoration: none; }
.btn-accent { background: var(--accent); color: var(--accent-contrast); }
.btn-accent:hover { background: var(--accent-hover); color: var(--accent-contrast); }
.btn-ghost { border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--text); }

/* Sections */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { text-align: center; font-size: 1.8rem; margin: 0 0 32px; }
.section-lede { color: var(--text-dim); max-width: 640px; margin: -8px 0 28px; }
.section-note { color: var(--text-dim); font-size: 0.9rem; margin-top: 20px; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 22px;
}
.card p { color: var(--text-dim); margin: 0; font-size: 0.95rem; }

/* Steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 24px; max-width: 640px; }
.steps li { display: flex; gap: 18px; align-items: flex-start; }
.step-num {
  flex: none; width: 34px; height: 34px; border-radius: 50%;
  background: var(--accent); color: var(--accent-contrast);
  display: flex; align-items: center; justify-content: center; font-weight: 700;
}
.steps p { color: var(--text-dim); margin: 0; }

/* Code block */
.code-block {
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 18px 20px; overflow-x: auto; max-width: 560px;
}
.code-block code { background: none; color: var(--text); padding: 0; font-size: 0.9rem; white-space: pre; }
.get-started-actions { margin-top: 32px; justify-content: flex-start; }

/* Generic sub-page hero (Engine, Releases, Changelogs) */
.profiles-hero { padding: 56px 0 40px; }
.profiles-hero .hero-meta { margin-bottom: 12px; }

/* Changelog page */
.cl-tabs {
  display: flex; gap: 6px; margin-bottom: 28px;
  border-bottom: 1px solid var(--border); padding-bottom: 0;
}
.cl-tab {
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--text-dim); font: inherit; font-size: 0.95rem; padding: 10px 18px;
  cursor: pointer; margin-bottom: -1px; border-radius: 0; transition: color 0.15s;
}
.cl-tab:hover { color: var(--text); }
.cl-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-ver { font-size: 0.78em; opacity: 0.65; margin-left: 5px; }

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

.cl-loading { color: var(--text-dim); }
.cl-error { color: var(--error-fg); }

.cl-block { border-left: 3px solid var(--border); padding: 0 0 4px 20px; margin-bottom: 36px; }
.cl-block:first-child { margin-top: 4px; }

.cl-version {
  font-size: 1.25rem; font-weight: 700; color: var(--text); margin: 0 0 12px;
  font-family: "Consolas", "Fira Mono", monospace;
}

.cl-label {
  display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em;
  text-transform: uppercase; padding: 3px 9px; border-radius: 999px; margin: 10px 0 6px;
}
.cl-label-added    { background: var(--label-added-bg);    color: var(--label-added-fg); }
.cl-label-changed  { background: var(--label-changed-bg);  color: var(--label-changed-fg); }
.cl-label-fixed    { background: var(--label-fixed-bg);    color: var(--label-fixed-fg); }
.cl-label-removed  { background: var(--label-removed-bg);  color: var(--label-removed-fg); }
.cl-label-breaking { background: var(--label-breaking-bg); color: var(--label-breaking-fg); }
.cl-label-security { background: var(--label-security-bg); color: var(--label-security-fg); }
.cl-label-other    { background: var(--panel); color: var(--text-dim); }

.cl-list { list-style: none; margin: 4px 0 10px; padding: 0; }
.cl-list li { color: var(--text-dim); font-size: 0.92rem; padding: 3px 0 3px 18px; position: relative; line-height: 1.5; }
.cl-list li::before { content: "\2013"; position: absolute; left: 0; color: var(--accent); }
.cl-list li.cl-sub { padding-left: 32px; }
.cl-list li.cl-sub::before { left: 14px; color: var(--border); }
.cl-list li strong { color: var(--text); font-weight: 600; }
.cl-list li code { font-size: 0.85em; }

.cl-prose { color: var(--text-dim); font-size: 0.9rem; margin: 0 0 8px; }

/* Releases page */
.release-status { color: var(--text-dim); margin-bottom: 24px; }
.release-error { color: var(--error-fg); }

.release-list { display: flex; flex-direction: column; gap: 20px; }

.release-card { padding: 22px 24px; }
.release-header { display: flex; align-items: baseline; flex-wrap: wrap; gap: 10px; margin-bottom: 10px; }
.release-version {
  font-size: 1.25rem; font-weight: 700; color: var(--text); margin: 0;
  font-family: "Consolas", "Fira Mono", monospace;
}
.release-date { color: var(--text-dim); font-size: 0.85rem; }
.release-badge-pre { background: var(--label-fixed-bg); color: var(--label-fixed-fg); }

.release-body p { color: var(--text-dim); font-size: 0.92rem; margin: 0 0 8px; }
.release-body a { color: var(--accent); }

.release-assets { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0 12px; }
.release-asset { padding: 8px 16px; font-size: 0.88rem; }

.release-source-link { font-size: 0.85rem; }

/* Legal */
.legal-hero { padding: 56px 0 24px; }
.page-title { font-size: 2rem; margin: 0 0 12px; }
.legal-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 24px; }
.legal-card {
  display: block; background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px 22px;
}
.legal-card:hover { border-color: var(--accent); text-decoration: none; }
.legal-card h3 { margin-bottom: 4px; color: var(--text); }
.legal-card p { color: var(--text-dim); margin: 0; font-size: 0.9rem; }

.legal-prose { max-width: 720px; }
.legal-prose h2 { font-size: 1.25rem; margin: 40px 0 14px; }
.legal-prose h2:first-child { margin-top: 0; }
.legal-prose p, .legal-prose li { color: var(--text-dim); }
.legal-prose ul { padding-left: 22px; margin: 12px 0; }
.legal-prose li { margin-bottom: 6px; }
.legal-meta {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin: -8px 0 28px;
}
.legal-back {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0 0; font-size: 0.9rem; }
.footer-inner { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; padding-bottom: 32px; }
.footer-brand-link { display: flex; align-items: center; gap: 8px; color: var(--text); font-weight: 700; }
.footer-icon { width: 22px; height: 22px; border-radius: 5px; }
.footer-tagline { color: var(--text-dim); margin: 8px 0 0; max-width: 32ch; }
.footer-versions { display: flex; flex-wrap: wrap; gap: 4px 10px; color: var(--muted); font-size: 0.8rem; margin: 10px 0 0; }
.footer-heading { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-dim); margin: 0 0 12px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { display: flex; align-items: center; gap: 9px; color: var(--text-dim); }
.footer-col a:hover { color: var(--text); text-decoration: none; }
.footer-col a i { width: 14px; text-align: center; color: var(--text-dim); font-size: 0.85em; flex-shrink: 0; }
.footer-avatar { width: 15px; height: 15px; border-radius: 50%; flex-shrink: 0; }
.footer-bottom { border-top: 1px solid var(--border); padding: 16px 0; }
.footer-note { margin: 0; font-size: 0.78rem; color: var(--muted); text-align: center; }
.footer-note + .footer-note { margin-top: 6px; }
.footer-note a { color: var(--muted); text-decoration: none; }
.footer-note a:hover { color: var(--text-dim); text-decoration: underline; }

/* Tablet */
@media (max-width: 1000px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .site-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--mobile-nav-bg); border-bottom: 1px solid var(--border);
    padding: 8px 0 16px; backdrop-filter: blur(6px);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 11px 24px; font-size: 1rem; }
  .nav-gh { margin: 8px 24px 0; text-align: center; border-radius: 6px; }
}

@media (max-width: 760px) {
  .grid-2, .grid-3, .legal-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
  h2, .section-title { font-size: 1.5rem; }
  .hero-logo { max-width: 260px; }
  .hero-tagline { font-size: 1.1rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 280px; text-align: center; }
  .get-started-actions { justify-content: center; flex-direction: column; align-items: center; }
  .get-started-actions .btn { width: 100%; max-width: 280px; text-align: center; }
  .code-block { max-width: 100%; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .page-title { font-size: 1.6rem; }

  /* Changelog tabs scroll on small screens */
  .cl-tabs { overflow-x: auto; padding-bottom: 1px; }
  .cl-tab { white-space: nowrap; }
}