:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #1f2933;
  --muted: #6b7280;
  --accent: #2f7d6e;       /* calm jade */
  --accent-soft: #e7f1ee;
  --line: #e6e2d8;
  --max: 820px;
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
}

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

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: 0.5px;
}
.site-header nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-header nav a { color: var(--muted); font-size: 0.95rem; }

/* Layout */
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px 60px;
}

.hero { padding: 40px 0 10px; text-align: center; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.78rem;
  color: var(--accent);
  margin: 0 0 8px;
}
.hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.25;
  margin: 0 0 12px;
}
.lede { color: var(--muted); font-size: 1.05rem; margin: 0 auto 24px; max-width: 640px; }

.video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}
.video-wrap video { width: 100%; height: 100%; display: block; object-fit: cover; }
.note { color: var(--muted); font-size: 0.85rem; margin-top: 10px; }

/* Article */
.guide, .transcript, .faq, .about {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin-top: 34px;
}
.guide h2, .transcript h2, .faq h2, .about h2 {
  margin-top: 0;
  font-size: 1.5rem;
}
.guide h3 {
  margin-top: 26px;
  font-size: 1.15rem;
  color: var(--accent);
}
.byline { color: var(--muted); font-size: 0.9rem; margin-bottom: 18px; }

/* Transcript */
.transcript-body p { margin: 0 0 14px; }
.transcript-body strong { color: var(--ink); }

/* FAQ */
.faq-list details {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before { content: "＋ "; color: var(--accent); }
.faq-list details[open] summary::before { content: "－ "; }
.faq-list p { margin: 10px 0 0; color: var(--ink); }

/* About / footer */
.about p { margin: 0 0 12px; }
.site-footer {
  max-width: var(--max);
  margin: 50px auto 0;
  padding: 24px 20px 40px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer .muted { font-size: 0.8rem; }

/* Contact block (About / footer) */
.contact {
  margin-top: 18px;
  padding: 18px 20px;
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: left;
}
.contact h3 { margin: 0 0 8px; font-size: 1.1rem; color: var(--accent); }
.contact p { margin: 0 0 10px; }
.contact ul { list-style: none; margin: 0; padding: 0; }
.contact li { margin: 6px 0; font-size: 1rem; }
.contact .label { display: inline-block; min-width: 60px; font-weight: 600; color: var(--muted); }
.contact code { background: #fff; border: 1px solid var(--line); padding: 2px 8px; border-radius: 6px; font-size: 0.95rem; }
.site-footer .contact { margin-top: 16px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .guide, .transcript, .faq, .about { padding: 22px 18px; }
}