:root {
  --color-bg: #0e0f11;
  --color-surface: rgba(20, 22, 25, 0.82);
  --color-text: #f5f3ef;
  --color-text-muted: #a9a9a3;
  --color-accent: #e8633a;
  --color-border: rgba(255, 255, 255, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --topbar-height: 56px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --tap-target: 44px;
  --z-topbar: 30;
  --z-panel: 20;
  --z-lightbox: 100;
}

*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

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

img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; padding: 0; }
ul { list-style: none; margin: 0; padding: 0; }
dl, dd { margin: 0; }

button:focus-visible,
a:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- top bar / nav (shared across pages, SPEC.md §4.4) ---------- */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-topbar);
  background: var(--color-surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.topbar-static { position: sticky; }

.topbar-inner {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-4);
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.site-title {
  font-weight: 700;
  text-decoration: none;
  font-size: 1.05rem;
  margin-right: auto;
}

.nav-toggle {
  display: none;
  min-width: var(--tap-target);
  min-height: var(--tap-target);
  font-size: 1.25rem;
  align-items: center;
  justify-content: center;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  text-decoration: none;
  padding: var(--space-2) var(--space-1);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  min-height: var(--tap-target);
  display: flex;
  align-items: center;
}

.nav-link.is-active,
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
}

.day-filter {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  min-height: var(--tap-target);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-border);
    display: none;
  }

  .nav.is-open { display: flex; }
  .day-filter { width: 100%; }
}

/* ---------- generic page content (stages.html, index.html/About) ---------- */

.stages-main,
.about-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

.page-title {
  margin: 0 0 var(--space-5);
  font-size: 1.6rem;
}

/* ---------- index.html (About / trip summary) ---------- */

.hero {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 7;
  background: linear-gradient(135deg, #2b2f36, #14161a);
  overflow: hidden;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-content { max-width: 720px; }

.trip-dates { color: var(--color-text-muted); margin-top: 0; }

.trip-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-3);
  margin: var(--space-5) 0;
}

.trip-stats li {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.stat-value { display: block; font-size: 1.3rem; font-weight: 700; }
.stat-label { display: block; font-size: 0.8rem; color: var(--color-text-muted); }

.trip-description { white-space: pre-line; line-height: 1.6; }

.about-map {
  height: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-5) 0;
  border: 1px solid var(--color-border);
}

.tech-credits {
  margin-top: var(--space-6);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.tech-credits a { color: var(--color-accent); }