:root {
  --ink: #111714;
  --ink-2: #1b2420;
  --acid: #d8ff3e;
  --acid-soft: #edff9f;
  --paper: #f4f6ef;
  --white: #ffffff;
  --line: #d9ded5;
  --muted: #626c66;
  --max: 1160px;
  --shadow: 0 24px 70px rgba(11, 20, 15, .16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .025em;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.narrow { max-width: 860px; }

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  color: #fff;
  background: rgba(17, 23, 20, .94);
  border-bottom: 1px solid rgba(255,255,255,.10);
  backdrop-filter: blur(16px);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.logo { display: inline-flex; align-items: center; gap: 12px; color: inherit; font-weight: 900; letter-spacing: .08em; text-decoration: none; }
.logo small { display: block; color: #aeb8b2; font-size: .68rem; font-weight: 700; letter-spacing: .18em; line-height: 1.2; }
.logo-mark { display: grid; width: 40px; height: 40px; place-items: center; color: var(--ink); background: var(--acid); border-radius: 12px 4px 12px 4px; font-size: 1.4rem; font-style: italic; }
.global-menu { display: flex; align-items: center; gap: 26px; }
.global-menu a { color: #e6ebe8; font-size: .9rem; font-weight: 700; text-decoration: none; }
.global-menu a:hover { color: var(--acid); }
.global-menu .nav-cta { padding: 9px 17px; color: var(--ink); background: var(--acid); border-radius: 999px; }
.menu-button { display: none; padding: 7px 12px; color: #fff; background: transparent; border: 1px solid rgba(255,255,255,.35); border-radius: 8px; cursor: pointer; }

.hero { position: relative; overflow: hidden; min-height: 700px; color: #fff; background: var(--ink); }
.hero-lines { position: absolute; inset: 0; opacity: .17; background-image: linear-gradient(115deg, transparent 0 47%, var(--acid) 47% 47.5%, transparent 47.5% 100%), repeating-linear-gradient(90deg, transparent 0 96px, rgba(255,255,255,.13) 96px 97px); }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.02fr .98fr; gap: 55px; align-items: center; padding-top: 76px; padding-bottom: 84px; }
.overline { margin: 0 0 15px; color: #607066; font-size: .76rem; font-weight: 900; letter-spacing: .2em; }
.hero .overline, .routine .overline { color: var(--acid); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 25px; font-size: clamp(3.2rem, 7vw, 6.5rem); line-height: 1.04; letter-spacing: -.045em; }
h1 em { color: var(--acid); font-style: normal; }
h2 { margin-bottom: 18px; font-size: clamp(2.2rem, 4.4vw, 4.2rem); line-height: 1.2; letter-spacing: -.035em; }
h3 { line-height: 1.35; }
.lead { max-width: 650px; color: #c8d0cc; font-size: 1.1rem; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 32px; }
.button { display: inline-flex; min-height: 52px; padding: 0 24px; align-items: center; justify-content: center; border: 1px solid var(--acid); border-radius: 10px; text-decoration: none; font-weight: 900; transition: transform .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(216,255,62,.14); }
.button.primary { color: var(--ink); background: var(--acid); }
.button.outline { color: #fff; background: transparent; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px 24px; margin: 0; padding: 0; color: #aeb8b2; font-size: .88rem; list-style: none; }
.hero-points li::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 9px; background: var(--acid); border-radius: 50%; }

.product-stage { position: relative; min-height: 520px; display: grid; place-items: center; }
.product-stage::before { content: ""; position: absolute; inset: 4% 8%; background: #eff2eb; border-radius: 46% 54% 40% 60% / 58% 38% 62% 42%; transform: rotate(-7deg); }
.product-stage::after { content: ""; position: absolute; width: 72%; height: 16px; bottom: 8%; background: rgba(0,0,0,.42); border-radius: 50%; filter: blur(14px); }
.product-stage img { position: relative; z-index: 2; width: min(88%, 500px); border-radius: 38px; mix-blend-mode: multiply; }
.stage-label { position: absolute; z-index: 3; top: 7%; right: 0; padding: 8px 13px; color: var(--ink); background: var(--acid); font-size: .72rem; font-weight: 900; letter-spacing: .12em; transform: rotate(3deg); }
.stage-note { position: absolute; z-index: 4; right: 1%; bottom: 8%; padding: 17px 20px; color: var(--ink); background: rgba(255,255,255,.95); border-radius: 14px; box-shadow: var(--shadow); }
.stage-note strong, .stage-note span { display: block; }
.stage-note strong { font-size: .82rem; }
.stage-note span { color: var(--muted); font-size: .78rem; }

.quick-bar { color: #fff; background: var(--ink-2); border-top: 1px solid rgba(255,255,255,.08); }
.quick-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.quick-grid > div { display: grid; grid-template-columns: 46px 1fr; gap: 14px; padding: 27px 24px; border-right: 1px solid rgba(255,255,255,.1); }
.quick-grid > div:last-child { border-right: 0; }
.quick-grid b { color: var(--acid); font-size: 1.35rem; font-style: italic; }
.quick-grid span, .quick-grid strong { display: block; }
.quick-grid span { color: #adb8b2; font-size: .78rem; line-height: 1.55; }
.quick-grid strong { color: #fff; font-size: .98rem; }

.section { padding: 100px 0; }
.section-heading { display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; margin-bottom: 42px; align-items: end; }
.section-heading h2 { margin-bottom: 0; }
.section-heading > p { margin-bottom: 6px; color: var(--muted); }
.problem-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.problem-button { min-height: 96px; padding: 17px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 14px; font-weight: 900; cursor: pointer; text-align: left; transition: color .2s, background .2s, border-color .2s, transform .2s; }
.problem-button span { display: block; margin-bottom: 3px; color: #87918b; font-size: .72rem; letter-spacing: .12em; }
.problem-button:hover { transform: translateY(-2px); border-color: #98a28b; }
.problem-button.active { color: #fff; background: var(--ink); border-color: var(--ink); }
.problem-button.active span { color: var(--acid); }
.problem-result { display: grid; grid-template-columns: 1.35fr .65fr; gap: 40px; margin-top: 18px; padding: 37px; background: var(--acid); border-radius: 20px; }
.result-label { margin-bottom: 5px; font-size: .72rem; font-weight: 900; letter-spacing: .15em; }
.problem-result h3 { margin-bottom: 8px; font-size: 1.55rem; }
.problem-result p { margin-bottom: 0; }
.problem-result dl { margin: 0; }
.problem-result dl > div { padding: 8px 0; border-bottom: 1px solid rgba(17,23,20,.2); }
.problem-result dl > div:last-child { border-bottom: 0; }
.problem-result dt { font-size: .72rem; font-weight: 800; }
.problem-result dd { margin: 1px 0 0; font-weight: 800; }

.routine { color: #fff; background: var(--ink); }
.light-heading > p { color: #aeb8b2; }
.steps { display: grid; grid-template-columns: repeat(5, 1fr); margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.18); }
.steps li { position: relative; padding: 28px 22px 10px 0; }
.steps li::before { content: ""; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; background: var(--acid); border-radius: 50%; }
.steps li > span { display: block; margin-bottom: 36px; color: var(--acid); font-size: .8rem; font-weight: 900; letter-spacing: .1em; }
.steps h3 { margin-bottom: 8px; font-size: 1.14rem; }
.steps p { color: #abb5af; font-size: .88rem; }

.choice { background: #fff; }
.choice-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 75px; align-items: start; }
.choice-copy { position: sticky; top: 116px; }
.choice-copy p:last-child { color: var(--muted); }
.check-list { border-top: 1px solid var(--line); }
.check-list article { display: grid; grid-template-columns: 58px 1fr; gap: 22px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.check-list b { display: grid; width: 48px; height: 48px; place-items: center; color: var(--ink); background: var(--acid); border-radius: 13px 4px 13px 4px; }
.check-list h3 { margin-bottom: 4px; font-size: 1.25rem; }
.check-list p { margin-bottom: 0; color: var(--muted); }

.product { overflow: hidden; background: #e5e9df; }
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.product-photo { position: relative; min-height: 520px; display: grid; place-items: center; background: #f8f9f5; border-radius: 28px 8px 28px 8px; box-shadow: var(--shadow); }
.product-photo::before { content: ""; position: absolute; width: 68%; height: 68%; background: var(--acid-soft); border-radius: 50%; }
.product-photo > span { position: absolute; z-index: 3; top: 22px; left: 24px; color: #6b756f; font-size: .72rem; font-weight: 900; letter-spacing: .18em; }
.product-photo img { position: relative; z-index: 2; width: min(90%, 500px); border-radius: 24px; mix-blend-mode: multiply; }
.product-copy > p { color: var(--muted); }
.spec-points { margin: 24px 0 28px; padding: 0; list-style: none; }
.spec-points li { padding: 10px 0; border-bottom: 1px solid #c9cec4; font-weight: 800; }
.spec-points li::before { content: "✓"; margin-right: 12px; color: #567000; }
.dark-button { color: #fff; background: var(--ink); border-color: var(--ink); }
.product-copy small { display: block; margin-top: 10px; color: #747d77; }

.faq { background: var(--paper); }
.faq h2 { margin-bottom: 34px; }
.faq details { padding: 22px 0; border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { position: relative; padding-right: 38px; font-size: 1.04rem; font-weight: 900; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 7px; top: -3px; color: #718000; font-size: 1.5rem; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 16px 38px 0 0; color: var(--muted); }

.site-footer { padding: 52px 0 24px; color: #dce2de; background: #0d120f; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; }
.footer-logo { color: #fff; }
.footer-grid p { margin: 18px 0 0; color: #89958e; }
.footer-grid nav { display: grid; grid-template-columns: 1fr 1fr; gap: 11px 24px; align-content: start; }
.footer-grid nav a { color: #c7cfca; font-size: .87rem; text-decoration: none; }
.footer-grid nav a:hover { color: var(--acid); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 38px; padding-top: 20px; color: #737f78; border-top: 1px solid rgba(255,255,255,.1); font-size: .74rem; }

@media (max-width: 900px) {
  .hero-grid, .section-heading, .choice-grid, .product-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 20px; padding-top: 58px; }
  .product-stage { min-height: 480px; }
  .section-heading { gap: 12px; }
  .problem-tabs { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr 1fr; border-top: 0; gap: 12px; }
  .steps li { padding: 22px; border-top: 1px solid rgba(255,255,255,.18); }
  .steps li::before { display: none; }
  .steps li > span { margin-bottom: 18px; }
  .choice-copy { position: static; }
}

@media (max-width: 720px) {
  .container { width: min(calc(100% - 28px), var(--max)); }
  .nav-wrap { min-height: 66px; }
  .menu-button { display: block; }
  .global-menu { display: none; position: absolute; top: 66px; left: 0; right: 0; padding: 20px; align-items: stretch; background: var(--ink); border-top: 1px solid rgba(255,255,255,.1); flex-direction: column; gap: 16px; }
  .global-menu.open { display: flex; }
  .global-menu .nav-cta { text-align: center; }
  h1 { font-size: clamp(3rem, 15vw, 5rem); }
  h2 { font-size: clamp(2rem, 10vw, 3.3rem); }
  .hero { min-height: 0; }
  .hero-lines { background-size: auto, 72px 100%; }
  .hero-grid { padding-bottom: 58px; }
  .product-stage { min-height: 380px; }
  .stage-note { right: 0; bottom: 0; }
  .quick-grid { grid-template-columns: 1fr; padding-block: 8px; }
  .quick-grid > div { padding: 18px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.1); }
  .quick-grid > div:last-child { border-bottom: 0; }
  .section { padding: 72px 0; }
  .problem-tabs { grid-template-columns: 1fr 1fr; }
  .problem-button { min-height: 86px; }
  .problem-result { grid-template-columns: 1fr; gap: 18px; padding: 27px 22px; }
  .steps { grid-template-columns: 1fr; }
  .product-photo { min-height: 390px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-grid nav { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 5px; }
}

@media (max-width: 420px) {
  .logo { font-size: .88rem; }
  .logo small { font-size: .58rem; }
  .logo-mark { width: 35px; height: 35px; }
  .hero-points { display: grid; }
  .button { width: 100%; }
  .problem-tabs { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}