:root {
  --ink: #111612;
  --paper: #f4f0e6;
  --cream: #e8d6a9;
  --amber: #dca343;
  --lcd: #b7c38e;
  --lcd-dark: #1c351c;
  --muted: #6c7168;
  --line: rgba(20, 26, 21, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

.topbar {
  align-items: center;
  backdrop-filter: blur(18px);
  background: rgba(244, 240, 230, 0.82);
  border-bottom: 1px solid var(--line);
  display: flex;
  height: 72px;
  justify-content: space-between;
  left: 0;
  padding: 0 clamp(22px, 6vw, 96px);
  position: sticky;
  right: 0;
  top: 0;
  z-index: 20;
}
.brand { align-items: center; display: flex; font-size: 18px; font-weight: 750; gap: 10px; letter-spacing: .08em; }
.brand img { border-radius: 10px; height: 36px; width: 36px; }
nav { display: flex; gap: clamp(18px, 3vw, 40px); }
nav a, footer a { color: #4e554d; font-size: 14px; }
nav a { align-items: center; display: flex; min-height: 44px; }
nav a:hover, footer a:hover { color: var(--ink); }

.hero {
  display: grid;
  gap: clamp(44px, 7vw, 110px);
  grid-template-columns: minmax(0, 1fr) minmax(360px, .86fr);
  margin: 0 auto;
  max-width: 1440px;
  min-height: calc(100vh - 72px);
  overflow: hidden;
  padding: clamp(72px, 10vw, 150px) clamp(24px, 7vw, 110px) 88px;
}
.hero-copy { align-self: center; max-width: 700px; position: relative; z-index: 2; }
.kicker { color: #767d72; font-size: 12px; font-weight: 750; letter-spacing: .19em; margin: 0 0 18px; text-transform: uppercase; }
h1 { font-family: "Songti SC", "STSong", serif; font-size: clamp(48px, 4.3vw, 72px); font-weight: 600; letter-spacing: -.055em; line-height: 1.02; margin: 0; text-wrap: balance; }
h1 span { display: block; }
.lead { color: #4f574e; font-size: clamp(17px, 1.6vw, 21px); line-height: 1.85; margin: 38px 0 0; max-width: 650px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.primary, .secondary {
  align-items: center;
  border-radius: 999px;
  display: inline-flex;
  font-size: 15px;
  font-weight: 700;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  transition: transform .2s ease, background .2s ease;
}
.primary { background: var(--ink); color: var(--paper); }
.secondary { border: 1px solid var(--line); }
.primary:hover, .secondary:hover { transform: translateY(-2px); }
.trust-row { color: var(--muted); display: flex; flex-wrap: wrap; font-size: 13px; gap: 12px 26px; list-style: none; margin: 34px 0 0; padding: 0; }
.trust-row li::before { color: #6f823f; content: "●"; font-size: 8px; margin-right: 9px; vertical-align: 2px; }

.radio-stage { align-self: center; min-height: 620px; position: relative; }
.radio-glow { background: radial-gradient(circle, rgba(220,163,67,.31), transparent 66%); filter: blur(12px); inset: -10%; position: absolute; }
.radio-shell {
  background: linear-gradient(145deg, #3d433f, #181d1a 70%);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 64px;
  box-shadow: 0 38px 90px rgba(25, 30, 25, .28), inset 0 2px 3px rgba(255,255,255,.16);
  inset: 4% 0;
  min-height: 560px;
  padding: clamp(32px, 5vw, 56px);
  position: absolute;
}
.radio-head { align-items: center; color: var(--cream); display: flex; font-family: "Songti SC", serif; font-size: 24px; justify-content: space-between; letter-spacing: .2em; }
.lamp { background: var(--amber); border-radius: 999px; box-shadow: 0 0 18px rgba(220,163,67,.7); height: 9px; width: 26px; }
.lcd { background: linear-gradient(135deg, #c7d09e, #6f7d55); border: 20px solid #0c100e; border-radius: 34px; color: var(--lcd-dark); margin-top: 28px; min-height: 138px; padding: 26px 30px; }
.lcd span { display: block; font: 700 10px/1.3 ui-monospace, monospace; letter-spacing: .18em; opacity: .65; }
.lcd strong { display: block; font: 700 clamp(17px, 2vw, 24px)/1.4 ui-monospace, monospace; margin-top: 13px; }
.dial { align-items: center; display: flex; height: 72px; margin: 18px 8px; }
.dial::before, .dial::after { background: #9e9981; content: ""; height: 6px; flex: 1; }
.dial span { background: linear-gradient(145deg, #f1d79a, #be9856); border-radius: 999px; box-shadow: 0 5px 14px rgba(0,0,0,.3); height: 64px; width: 64px; }
.speaker { background-color: #151a17; background-image: radial-gradient(#020302 28%, transparent 31%); background-size: 30px 30px; border-radius: 40px; height: 180px; opacity: .92; }

.section { margin: 0 auto; max-width: 1440px; padding: 120px clamp(24px, 7vw, 110px); }
.feature-section { border-top: 1px solid var(--line); }
.section-heading h2 { font-family: "Songti SC", serif; font-size: clamp(40px, 5vw, 72px); letter-spacing: -.05em; line-height: 1.05; margin: 0; }
.section-heading.narrow { max-width: 720px; }
.section-heading > p:not(.kicker) { color: var(--muted); line-height: 1.8; }
.updated { font-size: 14px; margin-top: 18px; }
.feature-grid { display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); margin-top: 64px; }
.feature-card { background: #eae5da; border: 1px solid rgba(18,24,19,.08); border-radius: 30px; min-height: 310px; padding: 34px; transition: transform .25s ease, box-shadow .25s ease; }
.feature-card:hover { box-shadow: 0 24px 48px rgba(29,35,29,.08); transform: translateY(-6px); }
.feature-card > p { color: #7a806e; font: 700 11px/1.2 ui-monospace, monospace; letter-spacing: .15em; }
.feature-card h3 { font-family: "Songti SC", serif; font-size: 29px; line-height: 1.25; margin: 74px 0 20px; }
.feature-card span { color: #5a6159; font-size: 15px; line-height: 1.85; }
.notice { align-items: start; border-bottom: 1px solid var(--line); border-top: 1px solid var(--line); display: grid; gap: 24px; grid-template-columns: 190px 1fr; margin-top: 72px; padding: 28px 0; }
.notice p { color: var(--muted); line-height: 1.8; margin: 0; }

.pro-section { padding-top: 70px; }
.pro-card {
  background: linear-gradient(145deg, #343a36, #141916 72%);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 42px;
  box-shadow: 0 34px 80px rgba(25,30,25,.18);
  color: var(--paper);
  display: grid;
  gap: clamp(36px, 7vw, 90px);
  grid-template-columns: minmax(0, 1fr) minmax(250px, .38fr);
  margin-top: 58px;
  overflow: hidden;
  padding: clamp(34px, 6vw, 72px);
  position: relative;
}
.pro-card::before { background: radial-gradient(circle, rgba(220,163,67,.24), transparent 68%); content: ""; height: 520px; position: absolute; right: -190px; top: -260px; width: 520px; }
.pro-copy, .price-panel { position: relative; z-index: 1; }
.pro-copy h3 { font-family: "Songti SC", serif; font-size: clamp(32px, 4vw, 52px); line-height: 1.16; margin: 0; max-width: 700px; }
.pro-copy ul { color: #c8ccc6; display: grid; gap: 15px; line-height: 1.65; list-style: none; margin: 36px 0 0; padding: 0; }
.pro-copy li::before { color: var(--amber); content: "✓"; font-weight: 800; margin-right: 12px; }
.price-panel { align-self: center; background: rgba(244,240,230,.09); border: 1px solid rgba(244,240,230,.16); border-radius: 30px; padding: 30px; text-align: center; }
.price-panel > span { color: #bfc4bc; font-size: 13px; font-weight: 700; }
.price-panel strong { color: var(--cream); display: block; font: 700 clamp(70px, 8vw, 104px)/1 ui-rounded, -apple-system, sans-serif; letter-spacing: -.07em; margin: 18px 0; }
.price-panel small { font-size: .4em; letter-spacing: 0; margin-right: 5px; vertical-align: .6em; }
.price-panel p { color: #c5c9c3; line-height: 1.7; margin: 0 0 24px; }
.price-panel .primary { background: var(--cream); color: var(--ink); width: 100%; }
.price-note { color: var(--muted); font-size: 12px; line-height: 1.7; margin: 18px 4px 0; }

.legal-section { background: var(--ink); color: var(--paper); max-width: none; padding-left: max(clamp(24px, 7vw, 110px), calc((100vw - 1440px)/2 + 110px)); padding-right: max(clamp(24px, 7vw, 110px), calc((100vw - 1440px)/2 + 110px)); }
.legal-section .kicker, .legal-section .updated { color: #aab0a6; }
.legal-grid { display: grid; gap: 0 52px; grid-template-columns: 1fr 1fr; margin-top: 66px; }
.legal-grid article { border-top: 1px solid rgba(244,240,230,.16); padding: 28px 0 34px; }
.legal-grid h3 { color: var(--cream); font-size: 18px; margin: 0 0 14px; }
.legal-grid p, .english-policy p { color: #b9bdb7; font-size: 15px; line-height: 1.95; margin: 0; }
.english-policy { border-bottom: 1px solid rgba(244,240,230,.16); border-top: 1px solid rgba(244,240,230,.16); margin-top: 24px; padding: 25px 0; }
.english-policy summary { color: var(--cream); cursor: pointer; font-weight: 700; }
.english-policy p { margin-top: 18px; max-width: 930px; }

.support-section { padding-bottom: 70px; }
.faq-list { margin-top: 58px; }
.faq-list details { border-top: 1px solid var(--line); padding: 24px 0; }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; font-size: 18px; font-weight: 720; list-style: none; }
.faq-list summary::after { content: "+"; float: right; font-size: 24px; font-weight: 400; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list p { color: var(--muted); line-height: 1.85; max-width: 900px; }
.support-box { align-items: center; background: #e4ddce; border-radius: 32px; display: flex; gap: 36px; justify-content: space-between; margin-top: 56px; padding: 38px; }
.support-box h3 { font-family: "Songti SC", serif; font-size: clamp(23px, 3vw, 34px); margin: 0 0 10px; }
.support-box p:not(.kicker) { color: var(--muted); margin: 0; }
.disabled { cursor: default; opacity: .62; text-align: center; }

footer { align-items: center; border-top: 1px solid var(--line); display: flex; gap: 28px; justify-content: space-between; margin: 0 auto; max-width: 1440px; padding: 34px clamp(24px, 7vw, 110px) 54px; }
footer p { color: var(--muted); font-size: 13px; text-align: center; }
footer > div { display: flex; gap: 20px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 70px; }
  .radio-stage { min-height: 580px; }
  .radio-shell { left: 50%; max-width: 520px; right: auto; transform: translateX(-50%); width: 100%; }
  .feature-grid { grid-template-columns: 1fr; }
  .pro-card { grid-template-columns: 1fr; }
  .price-panel { max-width: 420px; width: 100%; }
  .feature-card { min-height: 240px; }
  .feature-card h3 { margin-top: 44px; }
}

@media (max-width: 640px) {
  .topbar { height: 60px; padding: 0 18px; }
  nav { gap: 14px; }
  nav a { font-size: 12px; }
  .brand span { display: none; }
  .hero { gap: 42px; min-height: auto; padding: 52px 22px 60px; }
  .kicker { font-size: 10px; letter-spacing: .14em; margin-bottom: 14px; }
  h1 { font-size: clamp(30px, 9vw, 42px); letter-spacing: -.035em; line-height: 1.12; }
  h1 span + span { margin-top: 5px; }
  .lead { font-size: 15px; line-height: 1.75; margin-top: 24px; }
  .hero-actions { gap: 10px; margin-top: 26px; }
  .primary, .secondary { font-size: 14px; min-height: 46px; padding: 0 18px; }
  .trust-row { gap: 10px 18px; margin-top: 25px; }
  .radio-stage { min-height: 500px; }
  .radio-shell { border-radius: 44px; min-height: 470px; padding: 30px; }
  .lcd { border-width: 14px; min-height: 115px; padding: 20px; }
  .speaker { height: 140px; }
  .section { padding: 74px 22px; }
  .section-heading h2 { font-size: clamp(34px, 10vw, 48px); line-height: 1.12; }
  .feature-grid { gap: 14px; margin-top: 42px; }
  .feature-card { border-radius: 24px; min-height: 220px; padding: 26px; }
  .feature-card h3 { font-size: 26px; margin: 36px 0 16px; }
  .notice { margin-top: 50px; padding: 24px 0; }
  .pro-card { border-radius: 30px; margin-top: 42px; padding: 30px 24px; }
  .pro-copy h3 { font-size: 30px; }
  .pro-copy ul { gap: 12px; margin-top: 28px; }
  .price-panel { border-radius: 24px; padding: 26px 20px; }
  .legal-grid { grid-template-columns: 1fr; margin-top: 44px; }
  .legal-grid article { padding: 24px 0 28px; }
  .notice { grid-template-columns: 1fr; }
  .faq-list { margin-top: 42px; }
  .faq-list summary { align-items: center; display: grid; gap: 18px; grid-template-columns: 1fr auto; min-height: 48px; }
  .faq-list summary::after { float: none; }
  .support-box, footer { align-items: flex-start; flex-direction: column; }
  .support-box { gap: 24px; padding: 28px 24px; }
  footer { gap: 18px; padding: 30px 22px 44px; }
  footer p { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}