@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;600&family=Cormorant+Garamond:wght@400;500;600&family=Inter:wght@400;500;600&display=swap");

:root {
  --bg: #F5F1E8;
  --bg-alt: #EDE8DC;
  --bg-card: #FBFAF5;
  --fg: #1A1A1A;
  --fg-muted: #6B6B6B;
  --fg-faint: #9A968C;
  --accent: #4A5D23;
  --accent-dark: #3A4A1C;
  --accent-light: #5C6B3B;
  --warning: #B84C30;
  --warning-bg: #FBE9E3;
  --border: #D8D5CD;
  --footer-bg: #2A2A23;
  --footer-fg: #E8E4D8;
  --footer-fg-muted: #908A7A;

  --font-serif-jp: "Noto Serif JP", serif;
  --font-sans-jp: "Noto Sans JP", sans-serif;
  --font-serif-en: "Cormorant Garamond", serif;
  --font-sans: "Inter", -apple-system, sans-serif;

  --max-w: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans-jp);
  font-weight: 400;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.8;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ========== Subtle contour background ========== */
.contour-bg { position: relative; }
.contour-bg::before {
  content: ""; position: fixed; inset: 0;
  background-image:
    radial-gradient(ellipse 800px 600px at 80% 30%, rgba(74,93,35,0.04) 0%, transparent 60%),
    radial-gradient(ellipse 600px 400px at 20% 70%, rgba(74,93,35,0.03) 0%, transparent 60%);
  pointer-events: none; z-index: 0;
}
.contour-bg > * { position: relative; z-index: 1; }

/* ========== Header ========== */
header.site-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand { display: flex; align-items: center; gap: 0.6rem; }
.brand-mark { width: 26px; height: 26px; flex-shrink: 0; }
.brand-mark circle { fill: none; stroke: currentColor; stroke-width: 0.8; }
.brand-text {
  font-family: var(--font-serif-en);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  color: currentColor;
}
nav.site-nav { display: flex; gap: 2rem; font-size: 0.85rem; }
nav.site-nav a { color: var(--fg); transition: color 0.2s; }
nav.site-nav a:hover { color: var(--accent); }
button.nav-toggle { display: none; background: none; border: 0; padding: 0.4rem; cursor: pointer; color: var(--fg); }
button.nav-toggle svg { width: 26px; height: 26px; display: block; }

/* ========== Footer ========== */
footer.site-footer {
  background: var(--footer-bg);
  color: var(--footer-fg);
  padding: 3rem 2rem 1.5rem;
  margin-top: 5rem;
  position: relative;
  overflow: hidden;
}
footer.site-footer::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(ellipse 600px 400px at 30% 60%, rgba(232,228,216,0.03) 0%, transparent 60%);
  pointer-events: none;
}
footer.site-footer > .container {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1fr;
  gap: 3rem;
  position: relative;
}
footer .brand { color: var(--footer-fg); }
footer h4 {
  font-family: var(--font-serif-en);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--footer-fg-muted);
  margin-bottom: 1rem;
  text-transform: uppercase;
  font-weight: 500;
}
footer .col p, footer .col li {
  font-size: 0.85rem; color: var(--footer-fg); line-height: 2;
}
footer .col p.muted { color: var(--footer-fg-muted); font-size: 0.78rem; margin-top: 0.5rem; }
footer ul { list-style: none; }
footer ul a { display: block; }
footer .social-icons { display: flex; gap: 0.6rem; margin-top: 0.5rem; }
footer .social-icons a {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  color: var(--footer-fg-muted);
  transition: color 0.2s;
}
footer .social-icons a:hover { color: var(--footer-fg); }
footer .social-icons svg { width: 16px; height: 16px; }
footer .copyright {
  max-width: var(--max-w);
  margin: 2rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(232,228,216,0.1);
  font-size: 0.75rem;
  color: var(--footer-fg-muted);
  position: relative;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.5rem;
  border-radius: 4px;
  font-family: var(--font-sans-jp);
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  letter-spacing: 0.03em;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); }
.btn-primary:disabled, .btn-secondary:disabled {
  background: #C8C4B8; color: #888; cursor: not-allowed;
}
.btn-secondary {
  background: var(--bg-card); color: var(--fg);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: white; }
.btn-large { padding: 1rem 1.8rem; font-size: 0.95rem; width: 100%; }
.btn svg { width: 14px; height: 14px; }
.btn-arrow::after { content: "→"; margin-left: 0.5em; }

/* ========== Container & sections ========== */
main { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }
.section { margin: 4rem 0; }

/* ========== Common typography ========== */
.section-label {
  font-family: var(--font-serif-en);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  color: var(--fg-muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-weight: 500;
}

/* =====================================================================
   LANDING PAGE
   ===================================================================== */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  padding: 2.5rem 0 3rem;
  align-items: start;
  position: relative;
}
.hero-text { position: relative; }
.hero-title {
  font-family: var(--font-serif-en);
  font-weight: 500;
  font-size: 8.5rem;
  line-height: 0.95;
  letter-spacing: 0.01em;
  margin-bottom: 1.2rem;
  color: var(--fg);
}
.hero-title span { display: block; }
.hero-byline {
  display: flex; align-items: center; gap: 0.8rem;
  font-family: var(--font-serif-en);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  color: var(--fg);
  margin: 1rem 0 0.4rem;
}
.hero-byline::before, .hero-byline::after {
  content: ""; height: 1px; flex: 1; background: var(--border); max-width: 30px;
}
.hero-byline::before { margin-right: 0.5rem; }
.hero-byline::after { display: none; }
.hero-subtitle {
  font-family: var(--font-sans-jp);
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin-left: calc(30px + 0.8rem);
  margin-bottom: 2.5rem;
}
.hero-tagline {
  font-family: var(--font-serif-jp);
  font-size: 1.15rem;
  line-height: 2;
  font-weight: 400;
  color: var(--fg);
}
.hero-chip {
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.hero-chip img {
  width: 100%; max-width: 560px;
  filter: drop-shadow(0 30px 40px rgba(0,0,0,0.12));
}
.hero-side-info {
  position: absolute;
  right: -2rem;
  top: 1rem; bottom: 1rem;
  display: flex; flex-direction: column;
  justify-content: space-between;
  align-items: center;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}
.hero-side-info > div {
  font-family: var(--font-serif-en);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
}
.hero-side-info .vline {
  width: 1px; background: var(--border);
  flex: 1; margin: 1rem 0;
}

/* CONCEPT row */
.concept {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 3rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 2rem 0;
}
.concept-lead h3 {
  font-family: var(--font-serif-jp);
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--fg);
}
.concept-lead p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 2;
}
.concept-list { display: grid; gap: 1.2rem; }
.concept-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 1rem;
  align-items: start;
}
.concept-icon {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  background: white;
  flex-shrink: 0;
}
.concept-icon svg { width: 18px; height: 18px; color: var(--accent); }
.concept-text strong {
  display: block; font-size: 0.95rem; font-weight: 500;
  color: var(--fg); margin-bottom: 0.2rem;
}
.concept-text p { font-size: 0.82rem; color: var(--fg-muted); line-height: 1.7; }

/* Features grid */
.features-title {
  font-family: var(--font-sans-jp);
  font-size: 1rem; font-weight: 500;
  margin-bottom: 2rem;
}
.features {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
}
.feature {
  display: flex; flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 0;
}
.feature-icon {
  width: 50px; height: 50px;
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-card);
  margin-bottom: 0.5rem;
}
.feature-icon svg { width: 22px; height: 22px; color: var(--accent); }
.feature strong {
  font-size: 0.9rem; font-weight: 500; line-height: 1.5;
  margin-bottom: 0.3rem;
}
.feature p { font-size: 0.75rem; color: var(--fg-muted); line-height: 1.7; }

/* Collection summary */
.coll-title {
  font-family: var(--font-sans-jp);
  font-size: 1rem; font-weight: 500;
  margin-bottom: 1.5rem;
}
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
  overflow: hidden;
}
.stat {
  padding: 1.5rem;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; background: var(--bg-alt); }
.stat-label {
  font-size: 0.75rem; color: var(--fg-muted); margin-bottom: 0.5rem;
}
.stat-value {
  font-family: var(--font-serif-en);
  font-size: 2rem;
  line-height: 1;
  color: var(--fg);
}
.stat-value small {
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-family: var(--font-sans-jp);
  margin-left: 0.2rem;
}
.stat-sub {
  font-size: 0.7rem;
  color: var(--fg-faint);
  margin-top: 0.5rem;
  font-family: var(--font-serif-en);
  letter-spacing: 0.05em;
}
.stat-link {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; height: 100%;
}
.stat-link span { color: var(--fg); font-size: 0.85rem; }
.stat-link::after { content: "→"; color: var(--accent); font-size: 1.2rem; }

/* Quote section */
.quote-section {
  margin: 4rem 0 0;
  padding: 4rem 2rem;
  background:
    linear-gradient(to bottom, rgba(245,241,232,0) 0%, rgba(245,241,232,0.7) 80%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 400'><defs><linearGradient id='mt' x1='0' y1='0' x2='0' y2='1'><stop offset='0' stop-color='%234A5D23' stop-opacity='0.45'/><stop offset='1' stop-color='%234A5D23' stop-opacity='0.1'/></linearGradient></defs><path d='M0,300 L150,200 L280,260 L420,150 L560,230 L700,170 L850,250 L1000,180 L1200,260 L1200,400 L0,400 Z' fill='url(%23mt)'/><path d='M0,340 L100,280 L240,310 L380,240 L520,290 L660,250 L820,310 L960,260 L1200,310 L1200,400 L0,400 Z' fill='%234A5D23' fill-opacity='0.3'/></svg>");
  background-size: cover;
  background-position: bottom;
  background-repeat: no-repeat;
  text-align: center;
  border-radius: 6px;
}
.quote-section blockquote {
  font-family: var(--font-serif-jp);
  font-size: 1.25rem;
  line-height: 2;
  color: var(--fg);
  font-weight: 400;
}
.quote-section cite {
  display: block;
  font-style: normal;
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin-top: 1.5rem;
  font-family: var(--font-serif-jp);
}
.quote-section cite::before { content: "— "; }

/* =====================================================================
   CLAIM PAGE
   ===================================================================== */
.claim-back {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin: 2rem 0 1rem;
}
.claim-back:hover { color: var(--accent); }
.claim-back::before { content: "←"; }
.claim-title {
  font-family: var(--font-serif-jp);
  font-size: 2.2rem;
  font-weight: 500;
  margin-bottom: 0.6rem;
}
.claim-subtitle {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}
.warn-box {
  display: flex; gap: 1rem;
  background: var(--warning-bg);
  border-left: 3px solid var(--warning);
  padding: 1.2rem 1.5rem;
  border-radius: 4px;
  margin-bottom: 2.5rem;
}
.warn-box .warn-icon {
  width: 24px; height: 24px;
  flex-shrink: 0;
  color: var(--warning);
}
.warn-box strong {
  display: block;
  color: var(--warning);
  margin-bottom: 0.3rem;
  font-weight: 600;
  font-size: 0.95rem;
}
.warn-box p {
  font-size: 0.82rem;
  color: var(--fg);
  line-height: 1.7;
}

/* Step list */
.steps { position: relative; }
.steps::before {
  content: "";
  position: absolute;
  left: 22px; top: 50px;
  width: 1px; bottom: 50px;
  border-left: 1px dashed var(--border);
}
.step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
}
.step-num {
  width: 46px; height: 46px;
  border-radius: 50%;
  background: white;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif-en);
  font-size: 1.2rem;
  color: var(--fg-muted);
  z-index: 1;
}
.step.active .step-num {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.step.done .step-num {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
}
.step-card h3 {
  font-family: var(--font-serif-jp);
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.step-card p {
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin-bottom: 1rem;
  line-height: 1.8;
}
.step-meta {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 0.4rem 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
}
.step-meta dt { color: var(--fg-muted); }
.step-meta dd {
  color: var(--fg);
  font-family: SF Mono, Menlo, monospace;
  word-break: break-all;
}
.step-meta dd a { color: var(--accent); }
.step-meta dd.waiting { color: var(--fg-faint); font-family: var(--font-sans-jp); }

/* Success card */
.success-card {
  display: flex; align-items: center; gap: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 1.5rem;
  margin-top: 2rem;
}
.success-icon {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  color: white;
  flex-shrink: 0;
}
.success-icon svg { width: 28px; height: 28px; }
.success-text { flex: 1; }
.success-text h3 {
  font-family: var(--font-serif-jp);
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
}
.success-text p { font-size: 0.85rem; color: var(--fg-muted); margin: 0; }
.success-actions {
  display: flex; gap: 0.6rem; flex-wrap: wrap;
  margin-top: 1rem;
}
.success-actions .btn {
  padding: 0.6rem 1rem; font-size: 0.85rem;
}

.help-section {
  margin-top: 3rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
}
.help-section h3 {
  font-size: 1rem; font-weight: 500;
  margin-bottom: 0.5rem;
  font-family: var(--font-serif-jp);
}
.help-section p {
  font-size: 0.85rem; color: var(--fg-muted);
  margin-bottom: 1rem;
}

/* Debug log */
#log {
  background: rgba(0,0,0,0.04);
  padding: 1rem;
  border-radius: 4px;
  max-height: 200px;
  overflow-y: auto;
  font-family: SF Mono, Menlo, monospace;
  font-size: 0.78rem;
  color: var(--fg-muted);
  margin-top: 1.5rem;
  display: none;
}
#log.visible { display: block; }
#log div { padding: 0.1rem 0; }

/* Responsive */
@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; padding: 2rem 0 1rem; }
  .hero-title { font-size: 4rem; }
  .hero-side-info { display: none; }
  .concept, .features, .stats { grid-template-columns: 1fr; }
  .features { grid-template-columns: repeat(2, 1fr); }
  footer.site-footer > .container { grid-template-columns: 1fr 1fr; }
  button.nav-toggle { display: block; }
  nav.site-nav { display: none; }
  /* nav-open 時はヘッダー全体を最前面に持ち上げる (main z-index と競合させない) */
  body.nav-open header.site-header { z-index: 1000; position: relative; }
  body.nav-open nav.site-nav {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 60px; left: 0; right: 0;
    background: #F5F1E8;
    padding: 1.4rem 1.6rem;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    gap: 1rem;
    z-index: 1000;
    font-size: 1rem;
    box-shadow: 0 12px 30px rgba(0,0,0,0.12);
  }
  body.nav-open nav.site-nav a { padding: 0.5rem 0; color: var(--fg); }
}