:root {
  --bg: #0d1117;
  --bg-2: #0b1220;
  --panel: #111827;
  --panel-soft: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --brand: #ef4444;
  --brand-dark: #dc2626;
  --accent: #fca5a5;
  --border: #2f3a4f;
  --link: #f87171;
  --shadow: 0 10px 35px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body { line-height: 1.65; }

img { max-width: 100%; display: block; }

a { color: var(--link); }
a:hover { color: #fecaca; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: .5rem .8rem;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

.container { width: min(1120px, 92%); margin: 0 auto; }

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(8px);
  background: rgba(13, 17, 23, 0.85);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  gap: 1rem;
}

.brand {
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.2px;
  font-size: 1.15rem;
}
.brand span { color: var(--brand); }

.main-nav {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}
.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  font-size: .95rem;
}
.main-nav a:hover { color: var(--text); }

.menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.45rem 0.7rem;
  border-radius: 0.55rem;
  cursor: pointer;
}

/* Hero */
.hero {
  padding: 4rem 0 2.5rem;
  background:
    radial-gradient(circle at 15% 0%, #1f2937 0%, #0d1117 44%),
    linear-gradient(180deg, #0d1117, #0d1117);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.6rem;
  align-items: start;
}
.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

h1, h2, h3, h4 { line-height: 1.25; margin-top: 0; }
h1 { font-size: clamp(1.9rem, 3vw, 3rem); margin-bottom: 0.9rem; }
h2 { font-size: clamp(1.4rem, 2vw, 2rem); margin-bottom: 0.8rem; }
h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
h3 a { color: inherit; text-decoration: none; }
h3 a:hover { color: var(--accent); }

.hero-copy, .section-copy {
  color: var(--muted);
  max-width: 70ch;
}

.hero-cta { display: flex; gap: 0.7rem; flex-wrap: wrap; margin: 1.2rem 0; }

.btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 0.65rem;
  padding: 0.7rem 1rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background .2s, transform .15s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-secondary {
  background: var(--panel-soft);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { color: var(--text); border-color: var(--accent); }

.hero-card {
  background: linear-gradient(180deg, #1f2937, #111827);
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}
.hero-card ul { margin: 0.4rem 0 0; padding-left: 1rem; }
.hero-card li { margin: .25rem 0; }
.hero-card a { color: var(--text); text-decoration: none; }
.hero-card a:hover { color: var(--accent); }

/* Sections */
.section { padding: 3.2rem 0; }
.section-alt {
  background: var(--bg-2);
  border-top: 1px solid #172132;
  border-bottom: 1px solid #172132;
}

/* Cards */
.card-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.card-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card, .tip {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 1.1rem;
  transition: transform .15s, border-color .2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card p, .tip p { color: var(--muted); margin-bottom: 0; }

/* Schedule */
.schedule-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}
.schedule-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 0.9rem 1rem;
}
.schedule-item p { margin: 0.2rem 0 0; color: var(--muted); }

/* Tips */
.tips {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

/* Details / FAQ */
details {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  padding: 0.85rem 1rem;
  margin: 0.75rem 0;
}
summary { cursor: pointer; font-weight: 600; }
details[open] { border-color: var(--accent); }
details p { color: var(--muted); margin: .5rem 0 0; }

/* Breadcrumbs */
.breadcrumbs {
  font-size: .9rem;
  color: var(--muted);
  padding: 1rem 0 0;
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: 0;
  margin: 0;
}
.breadcrumbs li::after { content: "›"; margin: 0 .35rem; color: var(--border); }
.breadcrumbs li:last-child::after { content: ""; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--text); }

/* Article prose */
.article {
  padding: 2.2rem 0 3rem;
}
.article-header { padding: 1rem 0 1.5rem; }
.article-meta { color: var(--muted); font-size: .9rem; margin-bottom: .6rem; }
.article-title { font-size: clamp(1.8rem, 2.6vw, 2.6rem); margin-bottom: .6rem; }
.article-lede { color: var(--muted); font-size: 1.05rem; max-width: 70ch; }

.prose {
  max-width: 760px;
  margin: 0 auto;
}
.prose h2 {
  margin-top: 2.2rem;
  padding-top: .6rem;
  border-top: 1px solid var(--border);
}
.prose h3 { margin-top: 1.6rem; }
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { padding-left: 1.2rem; margin: 0 0 1rem; }
.prose li { margin: .35rem 0; }
.prose blockquote {
  margin: 1rem 0;
  padding: .8rem 1rem;
  border-left: 3px solid var(--brand);
  background: var(--panel);
  border-radius: .4rem;
  color: var(--text);
}
.prose strong { color: #fff; }

.toc {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: .8rem;
  padding: 1rem 1.1rem;
  margin: 1.2rem 0 2rem;
}
.toc h4 { margin: 0 0 .5rem; }
.toc ol { margin: 0; padding-left: 1.2rem; color: var(--muted); }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

.related {
  margin-top: 2.2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}
.related h2 { margin-bottom: .6rem; }

/* Hub layouts */
.hub-hero {
  padding: 3rem 0 1.5rem;
  background: radial-gradient(circle at 15% 0%, #1f2937 0%, #0d1117 60%);
}
.hub-hero h1 { margin-bottom: .6rem; }
.hub-hero p { color: var(--muted); max-width: 70ch; }

/* Footer */
.site-footer { padding: 2.5rem 0 1.5rem; border-top: 1px solid var(--border); margin-top: 2rem; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
  padding-bottom: 1.2rem;
}
.footer-brand { font-weight: 800; font-size: 1.1rem; margin: 0 0 .3rem; }
.footer-brand span { color: var(--brand); }
.footer-tag { color: var(--muted); margin: 0; max-width: 38ch; }
.site-footer h4 { margin: 0 0 .6rem; font-size: 1rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .2rem 0; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: .5rem;
}
.footer-bottom p { margin: 0; color: var(--muted); font-size: .9rem; }

/* Forms */
.form-grid { display: grid; gap: .9rem; max-width: 520px; }
.form-grid label { font-weight: 600; }
.form-grid input, .form-grid textarea {
  width: 100%;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: .55rem;
  padding: .65rem .8rem;
  font: inherit;
}
.form-grid textarea { min-height: 140px; resize: vertical; }
.form-note { color: var(--muted); font-size: .9rem; }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid,
  .tips,
  .schedule-list,
  .card-grid,
  .card-grid-3,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .menu-btn { display: inline-block; }

  .main-nav {
    position: absolute;
    top: 70px;
    right: 4%;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 0.7rem;
    padding: 0.8rem;
    display: none;
    flex-direction: column;
    min-width: 200px;
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: flex; }
}