:root {
  --bg: #101820;
  --bg-soft: #16222c;
  --panel: #1b2a3a;
  --panel-2: #22364a;
  --ink: #e8e3d5;
  --ink-dim: #a8b3bf;
  --accent: #7fd1c8;
  --accent-2: #c8b48a;
  --blood: #a4554f;
  --link: #8fd8cf;
  --border: #2c4054;
  --code-bg: #0d151c;
  --code-border: #3c5a6e;
  --radius: 10px;
  --maxw: 1080px;
  font-size: 17px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Georgia, 'Times New Roman', serif;
  line-height: 1.65;
}

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

/* ---------- header ---------- */
.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 22px;
  min-height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: bold;
  font-size: 1.05rem;
  white-space: nowrap;
}
.brand img { width: 30px; height: 30px; border-radius: 6px; }
.brand:hover { text-decoration: none; }

.main-nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; align-items: center; }

.nav-item { position: relative; }
.main-nav > .nav-item > a,
.main-nav > a {
  display: block;
  padding: 8px 10px;
  color: var(--ink-dim);
  border-radius: 6px;
  white-space: nowrap;
  font-size: 0.95rem;
}
.main-nav > .nav-item > a:hover,
.main-nav > a:hover { color: var(--ink); text-decoration: none; }
.main-nav a.active { color: var(--accent); }

.caret { font-size: 0.7rem; margin-left: 2px; }

.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-width: 220px;
  padding: 6px;
  z-index: 60;
}
.nav-item:hover .dropdown, .nav-item:focus-within .dropdown { display: block; }
.dropdown a {
  display: block;
  padding: 7px 10px;
  color: var(--ink-dim);
  border-radius: 5px;
  font-size: 0.92rem;
}
.dropdown a:hover { color: var(--ink); background: var(--panel); text-decoration: none; }
.dropdown a.active { color: var(--accent); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--ink);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 1rem;
  cursor: pointer;
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px 0;
  font-size: 0.85rem;
  color: var(--ink-dim);
}
.breadcrumbs a { color: var(--ink-dim); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .sep { margin: 0 6px; opacity: 0.5; }

/* ---------- hero ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 20px 40px;
  text-align: center;
}
.eyebrow {
  display: inline-block;
  color: var(--accent-2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  margin-bottom: 12px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 14px;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.hero p { max-width: 720px; margin: 0 auto 22px; color: var(--ink-dim); font-size: 1.1rem; }
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 26px;
  margin: 0 0 28px;
  color: var(--accent-2);
  font-size: 0.95rem;
}
.hero-ctas { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: bold;
}
.btn:hover { background: var(--accent); color: var(--bg); text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--bg); }
.btn.primary:hover { background: #9fe0d8; }

/* ---------- layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 34px;
  align-items: start;
}

.content { min-width: 0; }
.content h1 { font-size: 2rem; margin: 0 0 6px; }
.intro { color: var(--ink-dim); font-size: 1.08rem; margin: 0 0 26px; }
.content h2 {
  font-size: 1.35rem;
  margin: 34px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 76px;
}
.content h3 { font-size: 1.1rem; margin: 24px 0 8px; scroll-margin-top: 76px; }
.content p { margin: 0 0 14px; }
.content ul, .content ol { margin: 0 0 16px; padding-left: 24px; }
.content li { margin-bottom: 7px; }

/* ---------- answer / code block ---------- */
.answer {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 16px 0;
}
.answer .label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 6px;
}
.answer pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.95rem;
  color: #d9f3ef;
}

/* ---------- media: images & video ---------- */
.figure {
  margin: 18px 0 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}
.figure img {
  display: block;
  width: 100%;
  height: auto;
}
.figure figcaption {
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--ink-dim);
}

.video { margin: 18px 0 22px; }
.video-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
}
.video-wrap iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video figcaption {
  padding: 8px 4px 0;
  font-size: 0.85rem;
  color: var(--ink-dim);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin: 10px 0 24px;
}
.gallery .figure { margin: 0; }

/* ---------- note & table ---------- */
.note {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-2);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 18px 0;
  font-size: 0.95rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0 20px;
  font-size: 0.93rem;
}
th, td {
  text-align: left;
  padding: 9px 12px;
  border: 1px solid var(--border);
  vertical-align: top;
}
th { background: var(--panel-2); color: var(--accent-2); font-weight: bold; }
tr:nth-child(even) td { background: var(--bg-soft); }

/* ---------- spoilers ---------- */
details {
  background: var(--panel);
  border: 1px dashed var(--blood);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 16px 0;
}
details summary {
  cursor: pointer;
  color: var(--blood);
  font-weight: bold;
}
details[open] summary { margin-bottom: 8px; }
details p { margin: 0; }

/* ---------- sidebar ---------- */
.sidebar { position: sticky; top: 80px; }
.side-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 16px;
}
.side-box h3 {
  margin: 0 0 10px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
}
.side-box ul { list-style: none; margin: 0; padding: 0; }
.side-box li { margin: 0 0 6px; }
.side-box a { color: var(--ink-dim); font-size: 0.92rem; }
.side-box a:hover { color: var(--accent); }
.side-box a.current { color: var(--accent); font-weight: bold; }

/* ---------- cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 0 0 30px;
}
.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  color: var(--ink);
}
.card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); transition: 0.15s; }
.card .num {
  display: inline-block;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--ink-dim); font-size: 0.9rem; }

.related-title { font-size: 1.05rem; margin: 34px 0 14px; color: var(--accent-2); }

/* ---------- home sections ---------- */
.home-section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 20px 10px;
}
.home-section h2 { font-size: 1.5rem; margin: 20px 0 16px; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  background: var(--panel);
  padding: 30px 20px 40px;
  color: var(--ink-dim);
  font-size: 0.88rem;
}
.footer-wrap { max-width: var(--maxw); margin: 0 auto; }
.footer-cols { display: flex; flex-wrap: wrap; gap: 40px; margin-bottom: 20px; }
.footer-cols h4 { color: var(--accent-2); margin: 0 0 10px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; }
.footer-cols ul { list-style: none; margin: 0; padding: 0; }
.footer-cols li { margin-bottom: 6px; }
.footer-cols a { color: var(--ink-dim); }
.footer-cols a:hover { color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .wrap { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--panel-2);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 10px 16px 16px;
    gap: 0;
  }
  .main-nav.open { display: flex; }
  .dropdown { position: static; display: block; border: none; background: none; padding: 0 0 0 14px; min-width: 0; }
  .dropdown a { font-size: 0.9rem; }
}