:root {
  color-scheme: light;
  --bg: #f4faf9;
  --bg2: #e8f4f2;
  --card: rgba(255, 255, 255, 0.82);
  --card-solid: #ffffff;
  --text: #14353a;
  --muted: #5a7378;
  --accent: #0d6e6e;
  --accent2: #0a5555;
  --gold: #b8956c;
  --gold-soft: rgba(184, 149, 108, 0.22);
  --line: rgba(13, 110, 110, 0.14);
  --glow: rgba(72, 180, 180, 0.28);
  --danger: #b91c1c;
  --max: 720px;
  --sticky-h: 72px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse 90% 55% at 50% -10%, rgba(255,255,255,0.95) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 20%, rgba(184,149,108,0.12) 0%, transparent 50%),
    radial-gradient(ellipse 50% 35% at 0% 80%, rgba(72,180,180,0.16) 0%, transparent 45%),
    linear-gradient(165deg, #f7fcfb 0%, var(--bg) 45%, var(--bg2) 100%);
  background-attachment: fixed;
  padding-bottom: calc(var(--sticky-h) + 16px);
  line-height: 1.8;
  font-size: 16px;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  background: url("./assets/04-section-bubbles.png") center / cover no-repeat;
  mix-blend-mode: soft-light;
}

.page {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px 16px 48px;
}

.card {
  background: var(--card);
  backdrop-filter: blur(18px) saturate(1.15);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(20px, 4vw, 30px);
  box-shadow:
    0 1px 0 rgba(255,255,255,0.7) inset,
    0 16px 40px rgba(20, 53, 58, 0.07);
  margin-bottom: 18px;
}

.section { scroll-margin-top: 16px; }

.badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(236,253,245,0.95), rgba(255,250,240,0.9));
  color: var(--accent2);
  border: 1px solid rgba(168, 216, 200, 0.7);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.divider {
  height: 1px;
  margin: 8px 0 18px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--gold-soft), rgba(13,110,110,0.25), var(--gold-soft), transparent);
}

h1 {
  font-size: clamp(1.35rem, 4.2vw, 1.85rem);
  line-height: 1.45;
  font-weight: 700;
  margin: 14px 0 8px;
  letter-spacing: 0.01em;
  color: var(--text);
}

h2 {
  font-size: clamp(1.15rem, 3.5vw, 1.4rem);
  line-height: 1.5;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--text);
  letter-spacing: 0.01em;
}

h3 {
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--accent2);
}

.lead, p {
  color: var(--muted);
  margin: 0 0 12px;
}

.lead { font-size: 0.98rem; }

.product-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  margin: 6px 0 16px;
  letter-spacing: 0.02em;
}

.price-block {
  margin: 16px 0;
  padding: 16px 18px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(236,253,245,0.7), rgba(255,250,240,0.65));
  border: 1px solid rgba(168, 216, 200, 0.55);
}

.price-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.price-list li {
  color: var(--text);
  margin: 6px 0;
  font-size: 0.98rem;
}
.price-list .strike {
  color: var(--muted);
  text-decoration: line-through;
  font-size: 0.92rem;
}
.price-list .special {
  font-size: clamp(1.35rem, 4vw, 1.65rem);
  font-weight: 700;
  color: var(--accent2);
  text-shadow: 0 0 20px var(--glow);
}

.checklist {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}
.checklist li {
  position: relative;
  padding: 12px 12px 12px 36px;
  margin-bottom: 8px;
  background: rgba(248, 252, 251, 0.9);
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--muted);
  font-size: 0.95rem;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 1.15em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-soft);
}

.bullets {
  margin: 8px 0 4px;
  padding-left: 1.2em;
  color: var(--muted);
}
.bullets li {
  margin: 8px 0;
}
.bullets li::marker { color: var(--gold); }

.note-box {
  margin-top: 4px;
  padding: 16px 18px;
  background: rgba(248, 252, 251, 0.92);
  border: 1px solid var(--line);
  border-radius: 16px;
  font-size: 0.92rem;
  color: var(--muted);
}
.note-box p:last-child { margin-bottom: 0; }

.module {
  margin: 14px 0;
  padding: 16px 16px 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.55);
}
.module-num {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 4px;
}

.fit-grid {
  display: grid;
  gap: 14px;
}
@media (min-width: 560px) {
  .fit-grid { grid-template-columns: 1fr 1fr; }
}
.fit-card h3 { margin-bottom: 10px; }
.fit-card.yes h3 { color: var(--accent); }
.fit-card.no h3 { color: #8a5a4a; }

.img-slot {
  display: block;
  width: 100%;
  margin: 14px 0 4px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #d8e8e6;
  aspect-ratio: 16 / 9;
}
.img-slot img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-slot.portrait {
  aspect-ratio: 4 / 5;
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,0.6);
  margin-bottom: 10px;
  padding: 0 14px;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  padding: 14px 4px;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  float: right;
  color: var(--gold);
  font-weight: 700;
}
.faq details[open] summary::after { content: "−"; }
.faq details p {
  padding: 0 4px 14px;
  margin: 0;
  font-size: 0.95rem;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  text-align: center;
  text-decoration: none;
  border: 0;
  border-radius: 14px;
  padding: 16px 18px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  background: linear-gradient(160deg, #12807f 0%, var(--accent) 45%, var(--accent2) 100%);
  color: #fff !important;
  box-shadow: 0 10px 28px rgba(13, 110, 110, 0.28), 0 0 0 1px rgba(255,255,255,0.12) inset;
  transition: transform .15s ease, box-shadow .15s ease, filter .15s ease;
}
.cta:hover {
  filter: brightness(1.05);
  box-shadow: 0 14px 32px rgba(13, 110, 110, 0.34), 0 0 24px var(--glow);
}
.cta:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}
.cta-wrap { margin-top: 18px; }
.cta-sub {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.sticky-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  padding: 10px 14px calc(10px + env(safe-area-inset-bottom, 0px));
  background: rgba(244, 250, 249, 0.92);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
  box-shadow: 0 -8px 24px rgba(20, 53, 58, 0.06);
}
.sticky-cta .inner {
  max-width: var(--max);
  margin: 0 auto;
}
.sticky-cta .cta {
  padding: 14px 16px;
  font-size: 14.5px;
}

.site-footer {
  margin-top: 8px;
  padding: 20px 8px 8px;
  font-size: 11px;
  color: #7a8f93;
  text-align: center;
  letter-spacing: 0.04em;
}
.site-footer a {
  color: #7a8f93;
  text-decoration: none;
}

.instructor {
  display: grid;
  gap: 16px;
  align-items: start;
}
@media (min-width: 560px) {
  .instructor {
    grid-template-columns: 160px 1fr;
  }
  .img-slot.portrait {
    max-width: 160px;
    margin: 0;
  }
}

.include-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.include-list li {
  padding: 10px 0 10px 28px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  position: relative;
}
.include-list li:last-child { border-bottom: 0; }
.include-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}