/* ArchiveSeal — site styles
   Brand ink: #0F172A (slate-900) */

:root {
  --ink: #0F172A;
  --ink-soft: #1E293B;
  --paper: #FBFAF7;
  --paper-2: #F2EFE9;
  --muted: #5B6473;
  --line: rgba(15, 23, 42, 0.12);
  --line-strong: rgba(15, 23, 42, 0.22);
  --accent: #B08945; /* muted archival gold, used sparingly */
  --display: "Fraunces", Georgia, "Times New Roman", serif;
  --body: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --maxw: 1080px;
  --readw: 720px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px clamp(20px, 5vw, 56px);
  background: #0F172A;
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.logo-img {
  height: 28px;
  width: auto;
  display: block;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.32rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--ink);
}

.seal {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  position: relative;
  flex: none;
}
.seal::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.55;
}

.nav {
  display: flex;
  gap: clamp(14px, 3vw, 30px);
  font-size: 0.9rem;
}
.nav a {
  text-decoration: none;
  color: rgba(251, 250, 247, 0.72);
  transition: color 0.18s ease;
}
.nav a:hover { color: var(--paper); }

/* ---------- hero ---------- */
.hero {
  background: linear-gradient(180deg, #1E293B 0%, #0F172A 100%);
  color: var(--paper);
  padding: clamp(72px, 13vw, 150px) clamp(20px, 5vw, 56px) clamp(64px, 10vw, 120px);
  position: relative;
  overflow: hidden;
}
.hero::before {
  /* faint archival grid */
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse at 70% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; position: relative; }

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 22px;
}
.hero h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.6vw, 3.3rem);
  line-height: 1.18;
  letter-spacing: -0.005em;
  margin: 0 0 26px;
}
.hero .lede {
  font-size: clamp(1.05rem, 2.4vw, 1.32rem);
  max-width: 30ch;
  color: rgba(251, 250, 247, 0.86);
  margin: 0 0 18px;
  font-weight: 500;
}
.hero p.sub {
  max-width: 52ch;
  color: rgba(251, 250, 247, 0.62);
  font-size: 1rem;
  margin: 0 0 40px;
}

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  font-family: var(--body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.18s ease, border-color 0.18s ease;
}
.btn-primary { background: var(--paper); color: var(--ink); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost { border-color: rgba(251, 250, 247, 0.35); color: var(--paper); }
.btn-ghost:hover { border-color: var(--paper); }
.btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }

/* ---------- sections ---------- */
.section { padding: clamp(56px, 9vw, 110px) clamp(20px, 5vw, 56px); }
.section-inner { max-width: var(--maxw); margin: 0 auto; }

.section h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}
.section .section-sub { color: var(--muted); max-width: 56ch; margin: 0 0 50px; }

.tier-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.tier {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 30px 28px;
  background: #fff;
}
.tier.pro { border-color: var(--line-strong); background: var(--paper-2); }
.tier .tier-name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.25rem;
  margin: 0 0 4px;
}
.tier .tier-price { color: var(--muted); font-size: 0.92rem; margin: 0 0 20px; }
.tier .tier-incl { font-weight: 700; font-size: 0.92rem; margin: 0 0 14px; color: var(--ink); }
.tier ul { list-style: none; margin: 0; padding: 0; }
.tier li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 0.95rem;
  line-height: 1.6;
}
.tier li::before {
  content: "";
  position: absolute;
  left: 2px; top: 0.62em;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.note {
  margin-top: 40px;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 64ch;
}

/* ---------- legal / document pages ---------- */
.doc { padding: clamp(48px, 8vw, 96px) clamp(20px, 5vw, 56px) 30px; }
.doc-inner { max-width: var(--readw); margin: 0 auto; }
.doc .kicker {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}
.doc h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}
.doc .meta { color: var(--muted); font-size: 0.88rem; margin: 0 0 44px; }
.doc .intro { font-size: 1.02rem; margin: 0 0 36px; }
.doc h2 {
  font-size: 1.18rem;
  font-weight: 700;
  margin: 44px 0 12px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.doc h2:first-of-type { border-top: none; padding-top: 0; }
.doc p { margin: 0 0 16px; }
.doc ul { margin: 0 0 16px; padding-left: 1.3em; }
.doc li { margin-bottom: 8px; }
.doc ol { margin: 0 0 16px; padding-left: 1.4em; }
.doc ol li { margin-bottom: 10px; }
.doc a { color: var(--accent); text-underline-offset: 3px; }
.doc .effective {
  margin-top: 52px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

/* disclosure table (特商法) */
.disclosure {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 8px;
  font-size: 0.95rem;
}
.disclosure th,
.disclosure td {
  text-align: left;
  vertical-align: top;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}
.disclosure th {
  width: 34%;
  font-weight: 700;
  color: var(--ink);
  background: var(--paper-2);
  white-space: nowrap;
}
.disclosure td .price-line { display: block; margin-bottom: 4px; }
.disclosure td .fine { display: block; color: var(--muted); font-size: 0.84rem; line-height: 1.7; margin-top: 8px; }
@media (max-width: 560px) {
  .disclosure th, .disclosure td { display: block; width: 100%; border-bottom: none; }
  .disclosure th { border-top: 1px solid var(--line); white-space: normal; }
  .disclosure td { padding-top: 8px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(251, 250, 247, 0.72);
  padding: clamp(46px, 7vw, 72px) clamp(20px, 5vw, 56px);
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand { font-family: var(--display); font-size: 1.2rem; color: var(--paper); }
.footer-brand p { font-family: var(--body); font-size: 0.85rem; color: rgba(251,250,247,0.55); margin: 10px 0 0; max-width: 30ch; }
.footer-links { display: flex; flex-wrap: wrap; gap: 28px; }
.footer-col h4 {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(251,250,247,0.5);
  margin: 0 0 14px;
  font-weight: 600;
}
.footer-col a {
  display: block;
  text-decoration: none;
  color: rgba(251, 250, 247, 0.78);
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: color 0.16s ease;
}
.footer-col a:hover { color: var(--paper); }
.footer-col .soon { color: rgba(251,250,247,0.4); font-size: 0.9rem; margin-bottom: 10px; }
.copyright {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(251, 250, 247, 0.14);
  font-size: 0.8rem;
  color: rgba(251, 250, 247, 0.45);
}

.backlink {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 30px;
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
}
.backlink:hover { color: var(--ink); }

/* ---------- mobile nav (hamburger, <=1024px) ---------- */
.nav-toggle { display: none; }

@media (max-width: 1024px) {
  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0 11px;
    background: transparent;
    border: 1px solid rgba(251, 250, 247, 0.28);
    border-radius: 8px;
    cursor: pointer;
  }
  .nav-toggle:focus-visible { outline: 2px solid var(--paper); outline-offset: 2px; }
  .nav-toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--paper);
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: saturate(150%) blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 0;
  }
  .nav.open { display: flex; }
  .nav a {
    padding: 14px clamp(20px, 5vw, 56px);
    font-size: 1rem;
  }
  .nav a:hover { background: rgba(255, 255, 255, 0.06); }
}

/* ---------- pricing / pro pages ---------- */
.section h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 2.6rem);
  letter-spacing: -0.01em;
  margin: 16px 0 10px;
}
.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { transform: translateY(-2px); }
.cta-note { margin-top: 16px; font-size: 0.85rem; color: var(--muted); }