:root {
  --ink: #26372d;
  --ink-soft: #425248;
  --muted: #68736b;
  --paper: #fffdf7;
  --cream: #fff7df;
  --cream-deep: #f8edc9;
  --coral: #e87973;
  --coral-deep: #cf5f5a;
  --coral-soft: #fde7e2;
  --green: #7d9d75;
  --green-soft: #eaf2e4;
  --sky: #dceff1;
  --yellow: #f6d978;
  --line: rgba(38, 55, 45, .15);
  --white: #fff;
  --shadow: 0 22px 60px rgba(62, 74, 63, .13);
  --radius-lg: 32px;
  --radius-md: 22px;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.8;
  letter-spacing: .02em;
}

img { max-width: 100%; }
a { color: inherit; }
button { font: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(38,55,45,.08);
  background: rgba(255,253,247,.92);
  backdrop-filter: blur(14px);
}

.header-inner,
.section-inner,
.hero-inner,
.footer-inner {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.brand-mark,
.mini-mark {
  display: grid;
  place-items: center;
  color: white;
  background: var(--coral);
  border-radius: 14px;
  font-weight: 800;
  box-shadow: inset 0 -3px 0 rgba(0,0,0,.07);
}

.brand-mark { width: 42px; height: 42px; font-size: 19px; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-weight: 800; font-size: 19px; letter-spacing: .06em; }
.brand-sub { color: var(--muted); font-size: 11px; margin-top: 4px; }

.global-nav { display: flex; align-items: center; gap: 25px; }
.global-nav a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-soft);
  transition: color .2s ease;
}
.global-nav a:hover { color: var(--coral-deep); }

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 11% 18%, rgba(246,217,120,.36), transparent 24%),
    radial-gradient(circle at 89% 24%, rgba(125,157,117,.18), transparent 24%),
    linear-gradient(180deg, #fffaf0 0%, #fffdf7 100%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -9% -170px 38%;
  height: 330px;
  background: var(--coral-soft);
  border-radius: 50% 50% 0 0;
  transform: rotate(-5deg);
  opacity: .7;
}

.hero-inner {
  min-height: 690px;
  padding: 94px 0 102px;
  display: grid;
  grid-template-columns: 1.03fr .97fr;
  align-items: center;
  gap: 78px;
  position: relative;
  z-index: 1;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--coral-deep);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .14em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(45px, 6.2vw, 76px);
  line-height: 1.18;
  letter-spacing: .035em;
}
.hero h1 span { color: var(--coral-deep); }
.hero-lead {
  max-width: 620px;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
  transition: transform .2s ease, box-shadow .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { color: white; background: var(--coral); box-shadow: 0 12px 25px rgba(207,95,90,.24); }
.button.secondary { background: rgba(255,255,255,.72); border: 1px solid var(--line); }

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}
.hero-facts li::before { content: "●"; color: var(--green); font-size: 9px; margin-right: 8px; }

.hero-visual { position: relative; }
.sound-rings {
  position: absolute;
  width: 520px;
  height: 520px;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  border: 1px solid rgba(232,121,115,.17);
  border-radius: 50%;
}
.sound-rings::before,
.sound-rings::after {
  content: "";
  position: absolute;
  inset: 54px;
  border: 1px solid rgba(232,121,115,.15);
  border-radius: 50%;
}
.sound-rings::after { inset: 108px; }

.app-window {
  width: min(100%, 430px);
  margin: 0 auto;
  padding: 22px;
  position: relative;
  background: rgba(255,255,255,.96);
  border: 1px solid rgba(38,55,45,.09);
  border-radius: 34px;
  box-shadow: var(--shadow);
  transform: rotate(1.4deg);
}
.app-topbar { display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.app-brand { display: flex; align-items: center; gap: 9px; }
.mini-mark { width: 37px; height: 37px; border-radius: 12px; }
.app-brand span:last-child { display: flex; flex-direction: column; line-height: 1.25; }
.app-brand b { font-size: 14px; }
.app-brand small { color: var(--muted); font-size: 9px; }
.status-pill { padding: 5px 11px; border-radius: 999px; background: var(--green-soft); color: #587151; font-size: 10px; font-weight: 800; }

.sentence-card {
  margin-top: 21px;
  padding: 26px 24px;
  background: var(--cream);
  border-radius: 23px;
  border: 1px solid rgba(246,217,120,.37);
}
.sentence-card small { color: var(--coral-deep); font-size: 9px; font-weight: 900; letter-spacing: .13em; }
.sentence-card p { margin: 10px 0 8px; font-family: Georgia, "Times New Roman", serif; font-size: 26px; line-height: 1.35; }
.sentence-card span { color: var(--muted); font-size: 12px; }

.progress { height: 5px; margin: 24px 4px 0; background: #e8ece8; border-radius: 10px; overflow: hidden; }
.progress span { display: block; width: 59%; height: 100%; background: var(--coral); border-radius: inherit; }
.time-row { display: flex; justify-content: space-between; margin: 4px 4px 0; color: #8a938c; font-size: 9px; }
.player-controls { display: flex; justify-content: center; align-items: center; gap: 21px; margin: 19px 0 21px; }
.player-controls button {
  width: 42px; height: 42px; border: 0; border-radius: 50%; background: var(--green-soft); color: var(--ink); font-size: 11px; font-weight: 800;
}
.player-controls .play { width: 58px; height: 58px; color: white; background: var(--coral); font-size: 18px; padding-left: 5px; box-shadow: 0 10px 24px rgba(207,95,90,.26); }
.setting-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.setting-row div { padding: 12px 14px; background: #f5f8f4; border-radius: 15px; display: flex; flex-direction: column; }
.setting-row small { color: var(--muted); font-size: 9px; }
.setting-row b { font-size: 12px; }
.visual-note { margin: 15px 0 0; text-align: center; color: var(--muted); font-size: 11px; }

.section-pad { padding: 104px 0; }
.statement { padding: 112px 0; background: var(--green-soft); }
.statement-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 100px; align-items: start; }
.statement h2,
.section-heading h2,
.release h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 50px);
  line-height: 1.42;
  letter-spacing: .025em;
}
.developer-story { position: relative; padding-left: 32px; border-left: 3px solid var(--coral); }
.developer-story p { margin: 0 0 18px; color: var(--ink-soft); }
.developer-story .story-lead { color: var(--ink); font-size: 20px; font-weight: 800; line-height: 1.7; }
.developer-story .signature { margin-top: 28px; color: var(--coral-deep); font-size: 14px; font-weight: 800; }

.section-heading { max-width: 720px; margin-bottom: 55px; }
.section-heading.compact { max-width: 760px; }
.section-heading > p:last-child { margin: 18px 0 0; color: var(--muted); }

.features { background: var(--paper); }
.feature-list { border-top: 1px solid var(--line); }
.feature-row {
  min-height: 172px;
  display: grid;
  grid-template-columns: 72px 1fr 220px;
  align-items: center;
  gap: 30px;
  border-bottom: 1px solid var(--line);
}
.feature-no { color: var(--coral-deep); font-family: Georgia, serif; font-size: 23px; }
.feature-row h3 { margin: 0 0 7px; font-size: 21px; line-height: 1.5; }
.feature-row p { margin: 0; color: var(--muted); }
.feature-symbol { justify-self: end; padding: 17px 22px; border-radius: 18px 5px 18px 5px; background: var(--cream); font-family: Georgia, serif; font-size: 21px; font-weight: 700; letter-spacing: .06em; }
.feature-symbol i { color: var(--coral); font-style: normal; margin: 0 9px; }
.repeat-dots { justify-self: end; display: flex; align-items: center; gap: 8px; }
.repeat-dots i { display: block; width: 19px; height: 19px; border-radius: 50%; background: var(--coral-soft); }
.repeat-dots i:nth-child(-n+3) { background: var(--coral); }
.check-symbol { justify-self: end; width: 70px; height: 70px; display: grid; place-items: center; border-radius: 50%; background: var(--green-soft); color: var(--green); font-size: 35px; font-weight: 900; }
.ab-symbol { justify-self: end; width: 180px; display: flex; align-items: center; gap: 12px; }
.ab-symbol b { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 50%; background: var(--coral-soft); color: var(--coral-deep); }
.ab-symbol span { flex: 1; height: 4px; border-radius: 10px; background: linear-gradient(90deg,var(--coral),var(--yellow)); }

.steps { background: var(--cream); }
.step-line { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); position: relative; }
.step-line::before { content: ""; position: absolute; top: 29px; left: 7%; right: 7%; height: 2px; background: rgba(232,121,115,.26); }
.step-line li { position: relative; padding-right: 32px; }
.step-number { width: 58px; height: 58px; display: grid; place-items: center; position: relative; z-index: 1; border-radius: 50%; color: white; background: var(--coral); font-family: Georgia, serif; font-size: 22px; box-shadow: 0 0 0 9px var(--cream); }
.step-line h3 { margin: 26px 0 9px; font-size: 18px; line-height: 1.55; }
.step-line p { margin: 0; color: var(--muted); font-size: 14px; }

.release { padding: 100px 0; background: var(--sky); }
.release-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 80px; }
.release-inner > div:first-child { max-width: 760px; }
.release p:not(.section-kicker) { margin: 20px 0 0; color: var(--ink-soft); }
.release-badge { min-width: 290px; padding: 28px 30px; background: rgba(255,255,255,.68); border: 1px solid rgba(38,55,45,.1); border-radius: 4px 24px 4px 24px; }
.release-badge small { display: block; color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .12em; }
.release-badge b { display: block; margin-top: 6px; font-family: Georgia, serif; font-size: 22px; }

.site-footer { padding: 38px 0; background: var(--ink); color: white; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-inner > div { display: flex; flex-direction: column; line-height: 1.35; }
.footer-name { font-weight: 800; font-size: 17px; letter-spacing: .08em; }
.footer-sub,
.footer-inner small { color: rgba(255,255,255,.62); font-size: 10px; }

@media (max-width: 900px) {
  .global-nav { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 65px; padding-top: 75px; }
  .hero-copy { text-align: center; }
  .hero-lead { margin-left: auto; margin-right: auto; }
  .hero-actions,
  .hero-facts { justify-content: center; }
  .statement-grid { grid-template-columns: 1fr; gap: 45px; }
  .feature-row { grid-template-columns: 56px 1fr; padding: 28px 0; }
  .feature-row > :last-child { grid-column: 2; justify-self: start; margin-top: 8px; }
  .step-line { grid-template-columns: 1fr 1fr; gap: 50px 30px; }
  .step-line::before { display: none; }
  .release-inner { grid-template-columns: 1fr; gap: 38px; }
  .release-badge { min-width: 0; max-width: 350px; }
}

@media (max-width: 620px) {
  .header-inner,
  .section-inner,
  .hero-inner,
  .footer-inner { width: min(100% - 30px, var(--max)); }
  .header-inner { min-height: 68px; }
  .brand-mark { width: 38px; height: 38px; }
  .brand-name { font-size: 17px; }
  .hero-inner { min-height: auto; padding: 66px 0 78px; }
  .hero h1 { font-size: clamp(40px, 12vw, 58px); }
  .hero-lead { font-size: 15px; text-align: left; }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .hero-facts { display: grid; grid-template-columns: 1fr; text-align: left; justify-content: start; width: fit-content; margin-left: auto; margin-right: auto; }
  .app-window { padding: 16px; border-radius: 27px; }
  .sentence-card { padding: 22px 18px; }
  .sentence-card p { font-size: 22px; }
  .sound-rings { width: 390px; height: 390px; }
  .section-pad,
  .statement,
  .release { padding: 78px 0; }
  .statement h2,
  .section-heading h2,
  .release h2 { font-size: 31px; }
  .developer-story { padding-left: 20px; }
  .developer-story .story-lead { font-size: 18px; }
  .section-heading { margin-bottom: 36px; }
  .feature-row { grid-template-columns: 44px 1fr; gap: 12px; }
  .feature-row h3 { font-size: 18px; }
  .feature-row p { font-size: 14px; }
  .feature-symbol { font-size: 17px; }
  .step-line { grid-template-columns: 1fr; gap: 42px; }
  .step-line li { padding-right: 0; display: grid; grid-template-columns: 58px 1fr; gap: 18px; }
  .step-line h3 { margin: 0 0 7px; }
  .step-number { box-shadow: none; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}