/* Learn Go marketing site — Japanese classical (wafū) theme, mobile-first
   Palette: sumi ink (#0e1015) · gold leaf (#c9a227 / #d8b56a) · vermilion
   seal (#b3402e) · washi paper tones. Serif: Shippori Mincho + Cormorant. */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Shippori+Mincho:wght@400;500;600;700;800&display=swap');

:root {
  --ink: #0e1015;
  --ink2: #14171e;
  --ink3: #1b1f28;
  --paper: #e8e2d4;
  --paper-dim: #b9b2a0;
  --gold: #d8b56a;
  --gold-deep: #c9a227;
  --vermilion: #b3402e;
  --line: #2a2e38;
  --line-gold: rgba(216, 181, 106, 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(120% 80% at 50% -10%, #191d27 0%, var(--ink) 55%),
    var(--ink);
  color: var(--paper);
  font-family: "Shippori Mincho", "Cormorant Garamond", Georgia, "Times New Roman", serif;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

/* seigaiha (wave) watermark — fixed, very faint */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='56' viewBox='0 0 56 56'%3E%3Cg fill='none' stroke='%23d8b56a' stroke-width='0.8'%3E%3Cpath d='M28 28a28 28 0 0 1 56 0' transform='translate(-28 0)'/%3E%3Cpath d='M14 28a14 14 0 0 1 28 0'/%3E%3Cpath d='M21 28a7 7 0 0 1 14 0'/%3E%3Cpath d='M25 28a3 3 0 0 1 6 0'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 56px 56px;
  opacity: 0.05;
}

a { color: var(--gold); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--vermilion); }

.topbar, .hero, .features, .about, .path, .boards, .rules, .faq, .wallet, .legal-body, .footer-inner {
  position: relative;
  z-index: 1;
}

/* ── top bar ─────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 22px;
  max-width: 1100px;
  margin: 0 auto;
  border-bottom: 1px solid var(--line-gold);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-icon {
  width: 40px; height: 40px;
  border-radius: 6px;
  border: 1px solid var(--line-gold);
}
.brand-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.nav { display: flex; gap: 22px; font-size: 14px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--paper-dim); white-space: nowrap; }
.nav a:hover { color: var(--gold); }

/* ── hero ────────────────────────────── */
.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 22px 0;
}
.hero-banner {
  width: 100%;
  border-radius: 4px;
  border: 1px solid var(--line-gold);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.55);
  display: block;
}
.hero-body {
  text-align: center;
  padding: 52px 12px 10px;
}
.hero-kicker {
  font-size: 13px;
  letter-spacing: 6px;
  color: var(--gold-deep);
  text-transform: uppercase;
  margin: 0 0 14px;
}
.hero-body h1 {
  margin: 0;
  font-family: "Cormorant Garamond", "Shippori Mincho", serif;
  font-size: 56px;
  font-weight: 600;
  letter-spacing: 2px;
  line-height: 1.1;
}
.hero-seal {
  display: inline-block;
  margin-top: 18px;
  background: var(--vermilion);
  color: #f5efe2;
  font-family: "Shippori Mincho", serif;
  font-weight: 700;
  font-size: 15px;
  padding: 8px 14px;
  border-radius: 5px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
  transform: rotate(-2deg);
  letter-spacing: 2px;
}
.hero-vertical {
  display: none;
}
.tagline {
  color: var(--gold);
  font-size: 19px;
  font-style: italic;
  margin: 22px 0 0;
}
.lede {
  max-width: 600px;
  margin: 16px auto 0;
  color: var(--paper-dim);
  font-size: 15.5px;
}
.cta {
  display: inline-block;
  margin-top: 30px;
  padding: 14px 38px;
  border-radius: 4px;
  background: var(--vermilion);
  color: #f5efe2;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 2px;
  transition: transform 0.05s, background 0.15s;
}
.cta:hover { color: #fff; background: #c04a35; transform: scale(1.02); }

/* ── section scaffolding ─────────────── */
section { max-width: 1100px; margin: 0 auto; padding: 64px 22px 8px; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head .jp {
  display: block;
  font-size: 12.5px;
  letter-spacing: 5px;
  color: var(--gold-deep);
  margin-bottom: 8px;
}
.section-head h2 {
  margin: 0;
  font-family: "Cormorant Garamond", serif;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: 1.5px;
}
.section-head .divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  color: var(--gold-deep);
  font-size: 10px;
}
.section-head .divider::before,
.section-head .divider::after {
  content: "";
  width: 64px;
  height: 1px;
  background: var(--line-gold);
}
.section-lede {
  color: var(--paper-dim);
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  font-size: 15px;
}

/* ── features grid ───────────────────── */
.grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 40px; }
.card {
  background: linear-gradient(180deg, var(--ink3) 0%, var(--ink2) 100%);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line-gold);
  border-radius: 4px;
  padding: 26px 26px 22px;
  position: relative;
}
.card .kanji {
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 40px;
  color: rgba(216, 181, 106, 0.10);
  font-weight: 700;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--gold);
  letter-spacing: 0.5px;
}
.card p { margin: 0; color: var(--paper-dim); font-size: 14.5px; }

/* ── rules (four rules of Go) ────────── */
.rules-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 40px; }
.rule {
  background: var(--ink2);
  padding: 24px 22px;
  text-align: center;
}
.rule .r-num {
  font-family: "Cormorant Garamond", serif;
  font-size: 26px;
  color: var(--vermilion);
  font-style: italic;
}
.rule h3 { margin: 6px 0 8px; font-size: 16px; color: var(--paper); }
.rule p { margin: 0; font-size: 13.5px; color: var(--paper-dim); }

/* ── boards ──────────────────────────── */
.boards-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 40px; }
.board-card {
  background: var(--ink2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 26px;
  text-align: center;
}
.board-card .size {
  font-family: "Cormorant Garamond", serif;
  font-size: 34px;
  color: var(--gold);
  font-weight: 600;
}
.board-card .size span { font-size: 18px; }
.board-card .b-role { color: var(--paper-dim); font-size: 13.5px; margin: 8px 0 0; }

/* ── path (how to start) ─────────────── */
.path-steps { display: grid; grid-template-columns: 1fr; gap: 0; margin-top: 40px; }
.step {
  display: flex;
  gap: 20px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}
.step:last-child { border-bottom: none; }
.step .s-no {
  font-family: "Cormorant Garamond", serif;
  font-size: 30px;
  color: var(--vermilion);
  font-style: italic;
  min-width: 52px;
  line-height: 1.2;
}
.step h3 { margin: 0 0 6px; font-size: 17px; color: var(--paper); }
.step p { margin: 0; color: var(--paper-dim); font-size: 14.5px; }

/* ── faq ─────────────────────────────── */
.faq-list { margin-top: 36px; }
details {
  background: var(--ink2);
  border: 1px solid var(--line);
  border-radius: 4px;
  margin-bottom: 12px;
  padding: 0 22px;
}
summary {
  cursor: pointer;
  padding: 18px 0;
  color: var(--paper);
  font-size: 15.5px;
  font-weight: 600;
  list-style: none;
}
summary::before { content: "◆ "; color: var(--gold-deep); font-size: 10px; vertical-align: middle; }
details[open] summary { color: var(--gold); }
details p { color: var(--paper-dim); font-size: 14.5px; margin: 0 0 18px; }

/* ── wallet ──────────────────────────── */
.wallet {
  text-align: center;
  border-top: 1px solid var(--line-gold);
  padding-top: 56px;
}
.wallet .jp { letter-spacing: 5px; color: var(--gold-deep); font-size: 12.5px; }
.wallet h2 {
  font-family: "Cormorant Garamond", serif;
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 1px;
  margin: 8px 0 14px;
}
.wallet p { color: var(--paper-dim); max-width: 560px; margin: 0 auto; font-size: 15px; }
.wallet .seal-row { margin-top: 22px; }
.wallet .mini-seal {
  display: inline-block;
  background: var(--vermilion);
  color: #f5efe2;
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 4px;
  letter-spacing: 1px;
}

/* ── footer ──────────────────────────── */
.footer {
  margin-top: 70px;
  border-top: 1px solid var(--line-gold);
  background: var(--ink2);
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
}
.footer-brand { font-weight: 700; letter-spacing: 1px; color: var(--gold); }
.footer-links { display: flex; gap: 24px; font-size: 14px; }
.footer-links a { color: var(--paper-dim); }
.footer-links a:hover { color: var(--gold); }
.footer-contact { margin: 2px 0 0; font-size: 13px; color: var(--paper-dim); }

/* ── legal pages ─────────────────────── */
.legal-body {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 24px 8px;
}
.legal-body h1 {
  font-family: "Cormorant Garamond", serif;
  font-size: 34px;
  font-weight: 600;
  letter-spacing: 1px;
  margin: 0 0 6px;
}
.legal-meta {
  color: var(--paper-dim);
  font-size: 13.5px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--vermilion);
  border-radius: 2px;
  background: var(--ink2);
  padding: 14px 18px;
  margin: 16px 0 30px;
  line-height: 1.8;
}
.legal-body h2 {
  font-size: 19px;
  margin: 36px 0 10px;
  color: var(--gold);
  padding-left: 14px;
  border-left: 2px solid var(--gold-deep);
}
.legal-body h3 { font-size: 16px; margin: 26px 0 8px; color: var(--paper); }
.legal-body p, .legal-body li { color: var(--paper-dim); font-size: 15px; }
.legal-body ul { padding-left: 22px; }
.legal-body li { margin-bottom: 8px; }
.legal-body strong { color: var(--paper); }

/* ── desktop ─────────────────────────── */
@media (min-width: 720px) {
  .grid { grid-template-columns: 1fr 1fr 1fr; }
  .boards-grid { grid-template-columns: 1fr 1fr 1fr; }
  .path-steps { grid-template-columns: 1fr 1fr 1fr; gap: 36px; }
  .step { flex-direction: column; padding: 0; border-bottom: none; border-left: 1px solid var(--line); padding-left: 24px; }
  .step:first-child { border-left: none; padding-left: 0; }
  .hero-body { padding-top: 60px; }
  .hero-body h1 { font-size: 68px; }
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
  .hero-vertical {
    display: block;
    position: absolute;
    right: -8px;
    top: 120px;
    writing-mode: vertical-rl;
    font-size: 13px;
    letter-spacing: 8px;
    color: rgba(216, 181, 106, 0.5);
  }
  .hero { position: relative; }
}