:root {
  --navy: #0b1f4d;
  --blue: #1d4ed8;
  --blue-600: #2563eb;
  --sky: #38bdf8;
  --ink: #0f172a;
  --muted: #475569;
  --line: #dbe4f3;
  --bg: #f4f7fc;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
a { color: var(--blue); }
img, video { max-width: 100%; display: block; }
code { background: #eef3fb; border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; font-size: .92em; word-break: break-all; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* Header / hero */
.hero {
  color: #fff;
  background:
    radial-gradient(900px 400px at 85% -10%, rgba(56, 189, 248, .35), transparent 60%),
    linear-gradient(135deg, var(--navy) 0%, #12307a 55%, var(--blue) 100%);
}
.hero .wrap { padding-top: 64px; padding-bottom: 72px; }
.hero.compact .wrap { padding-top: 28px; padding-bottom: 40px; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: 12px; font-weight: 600; color: #bfdbfe; margin: 0 0 12px; }
.hero h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.1; margin: 0 0 16px; letter-spacing: -.02em; }
.hero p.lead { font-size: clamp(16px, 2vw, 19px); color: #dbeafe; max-width: 720px; margin: 0; }
.back { display: inline-block; color: #bfdbfe; text-decoration: none; font-size: 14px; margin-bottom: 20px; }
.back:hover { color: #fff; }

/* Cards */
main { padding: 0 0 64px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 22px;
  margin-top: -36px;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 24px 22px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 2px 4px rgba(15, 23, 42, .06), 0 16px 36px rgba(29, 78, 216, .12); }
.card .icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #dbeafe, #e0f2fe);
  color: var(--blue);
  margin-bottom: 16px;
}
.card .icon svg { width: 24px; height: 24px; }
.tag { font-size: 12px; font-weight: 600; color: var(--blue-600); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 6px; }
.card h2 { font-size: 20px; margin: 0 0 10px; letter-spacing: -.01em; }
.card p { color: var(--muted); margin: 0 0 14px; font-size: 15px; }
.card ul { margin: 0 0 20px; padding-left: 18px; color: var(--muted); font-size: 14px; }
.card ul li { margin: 3px 0; }
.card .actions { margin-top: auto; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.card.placeholder { border-style: dashed; }

.info {
  position: absolute; top: 20px; right: 20px;
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--blue); background: #eff6ff; border: 1px solid #bfdbfe;
  text-decoration: none;
}
.info:hover { background: var(--blue); color: #fff; }
.info svg { width: 18px; height: 18px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px;
  font-weight: 600; font-size: 14px; text-decoration: none;
  background: var(--blue); color: #fff; border: 1px solid var(--blue);
}
.btn:hover { background: var(--navy); border-color: var(--navy); }
.btn.ghost { background: transparent; color: var(--blue); border-color: #bfdbfe; }
.btn.ghost:hover { background: #eff6ff; }
.btn[aria-disabled="true"] { background: #e2e8f0; border-color: #e2e8f0; color: #64748b; pointer-events: none; }

/* Guide pages */
.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 28px; margin-top: 24px;
}
.panel:first-child { margin-top: -24px; }
.panel h2 { margin: 0 0 6px; font-size: 22px; }
.panel > p.sub { margin: 0 0 20px; color: var(--muted); }
.note { background: #eff6ff; border-left: 4px solid var(--blue); padding: 12px 16px; border-radius: 8px; color: #1e3a8a; font-size: 14px; margin: 0 0 20px; }
.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; }
.steps > li { counter-increment: s; position: relative; padding: 0 0 22px 52px; }
.steps > li::before {
  content: counter(s);
  position: absolute; left: 0; top: -2px;
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--blue); color: #fff; font-weight: 700; font-size: 14px;
}
.steps > li h3 { margin: 4px 0 6px; font-size: 16px; }
.steps > li p { margin: 0 0 8px; color: var(--muted); }
.steps img { border: 1px solid var(--line); border-radius: 10px; margin-top: 10px; max-height: 520px; width: auto; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; margin: 8px 0; font-size: 14px; }
.kv dt { font-weight: 600; color: var(--ink); }
.kv dd { margin: 0; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; list-style: none; }
.chips li { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e3a8a; border-radius: 999px; padding: 6px 14px; font-size: 14px; }
.videos { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.videos figure { margin: 0; }
.videos video { width: 100%; border-radius: 10px; border: 1px solid var(--line); background: #000; }
.videos figcaption { font-weight: 600; margin-top: 8px; }
.toc { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.toc a { color: #fff; border: 1px solid rgba(255, 255, 255, .35); padding: 6px 14px; border-radius: 999px; text-decoration: none; font-size: 14px; }
.toc a:hover { background: rgba(255, 255, 255, .12); }

footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
footer .wrap { padding-top: 22px; padding-bottom: 28px; }

@media (max-width: 520px) {
  .wrap { padding: 0 16px; }
  .grid { grid-template-columns: 1fr; }
  .panel { padding: 20px; }
  .steps > li { padding-left: 46px; }
}

.shots { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 18px; }
.shots figure { margin: 0; }
.shots img { width: 100%; border-radius: 16px; border: 1px solid var(--line); box-shadow: var(--shadow); }
.shots figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; text-align: center; }