:root {
  color-scheme: light;
  --blue: #4f86b8;
  --blue-deep: #2f6fa9;
  --blue-soft: #eaf2fa;
  --ink: #202020;
  --muted: #748091;
  --line: #dfe7ef;
  --white: #fff;
  --max: 1180px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", "PingFang TC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--white); color: var(--ink); line-height: 1.7; }
a { color: inherit; }
img, svg { display: block; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgb(255 255 255 / 92%);
  border-bottom: 1px solid rgb(223 231 239 / 85%);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(var(--max), calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-size: 24px; font-weight: 760; }
.brand-mark { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; color: white; background: var(--blue); box-shadow: 0 0 0 8px var(--blue-soft); }
.brand-mark svg { width: 21px; height: 21px; }
.nav-links { display: flex; align-items: center; gap: 30px; font-weight: 620; }
.nav-links a { text-decoration: none; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--blue-deep); }

.hero {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  min-height: 650px;
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  align-items: center;
  gap: clamp(36px, 7vw, 94px);
  padding: 86px 0 72px;
}

.hero h1 { margin: 0; max-width: 650px; font-size: clamp(44px, 5.8vw, 74px); line-height: 1.12; letter-spacing: -.045em; }
.hero p { margin: 26px 0 32px; max-width: 600px; color: #4f5b69; font-size: clamp(18px, 2vw, 23px); }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 12px 22px; border-radius: 10px; background: var(--blue-deep); color: white; font-weight: 700; text-decoration: none; box-shadow: 0 10px 24px rgb(47 111 169 / 18%); }
.button:hover, .button:focus-visible { background: #285e90; }

.phone-stage { position: relative; min-height: 520px; display: grid; place-items: center; }
.rings, .rings::before, .rings::after { position: absolute; inset: 50% auto auto 50%; width: 340px; height: 340px; border: 1px solid #cfe1f2; border-radius: 50%; transform: translate(-50%, -50%); }
.rings::before, .rings::after { content: ""; width: 240px; height: 240px; }
.rings::after { width: 440px; height: 440px; }
.phone { position: relative; width: 278px; min-height: 548px; padding: 18px; border: 8px solid #141414; border-radius: 48px; background: #fff; box-shadow: 0 28px 58px rgb(22 52 78 / 21%); }
.phone::before { content: ""; position: absolute; top: 11px; left: 50%; width: 90px; height: 20px; border-radius: 14px; background: #101010; transform: translateX(-50%); }
.phone-top { margin-top: 28px; display: flex; justify-content: space-between; align-items: center; color: var(--blue-deep); font-size: 20px; font-weight: 760; }
.mic-orbit { width: 168px; height: 168px; margin: 48px auto 24px; border-radius: 50%; display: grid; place-items: center; color: var(--blue-deep); background: radial-gradient(circle, var(--blue-soft) 0 32%, transparent 33% 48%, #d6e6f5 49% 50%, transparent 51% 66%, #e3eef8 67% 68%, transparent 69%); }
.mic-orbit svg { width: 50px; height: 50px; }
.timer { text-align: center; font-size: 25px; font-weight: 720; }
.timer span { display: block; color: var(--muted); font-size: 13px; font-weight: 600; }
.wave { height: 52px; margin: 30px 8px 20px; display: flex; align-items: center; justify-content: center; gap: 5px; }
.wave i { width: 4px; border-radius: 5px; background: var(--blue); }
.wave i:nth-child(1), .wave i:nth-child(7) { height: 14px; }
.wave i:nth-child(2), .wave i:nth-child(6) { height: 27px; }
.wave i:nth-child(3), .wave i:nth-child(5) { height: 42px; }
.wave i:nth-child(4) { height: 52px; }
.phone-action { width: 66px; height: 66px; margin: 0 auto; border-radius: 50%; display: grid; place-items: center; color: white; background: var(--blue); font-size: 23px; }

.feature-band { background: linear-gradient(180deg, #f8fbfe, #fff); border-block: 1px solid #edf3f8; }
.features { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; padding: 100px 0; }
.section-title { margin: 0 0 14px; font-size: clamp(34px, 4vw, 52px); letter-spacing: -.035em; }
.section-lead { margin: 0; max-width: 700px; color: var(--muted); font-size: 19px; }
.feature-list { margin-top: 68px; display: grid; gap: 0; }
.feature { display: grid; grid-template-columns: 92px 1fr 1.1fr; align-items: center; gap: 42px; padding: 52px 0; border-top: 1px solid var(--line); }
.feature:last-child { border-bottom: 1px solid var(--line); }
.feature-icon { width: 82px; height: 82px; border: 1px solid #d4e4f2; border-radius: 50%; display: grid; place-items: center; color: var(--blue-deep); background: var(--blue-soft); }
.feature-icon svg { width: 38px; height: 38px; }
.feature h3 { margin: 0 0 8px; font-size: 29px; }
.feature p { margin: 0; color: var(--muted); }
.feature-preview { min-height: 142px; padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 16px 40px rgb(40 86 125 / 8%); }
.feature-preview strong { display: block; margin-bottom: 12px; }
.feature-preview span { display: block; height: 10px; margin: 9px 0; border-radius: 6px; background: #e8edf2; }
.feature-preview span:nth-child(2) { width: 82%; }
.feature-preview span:nth-child(3) { width: 68%; }

.privacy-home { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; padding: 112px 0; display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: 86px; }
.shield-art { width: min(350px, 100%); aspect-ratio: 1; margin: auto; border: 1px dashed #bcd6ec; border-radius: 50%; display: grid; place-items: center; background: radial-gradient(circle, var(--blue-soft), white 67%); color: var(--blue-deep); }
.shield-art svg { width: 150px; height: 150px; }
.principles { margin: 34px 0 0; padding: 0; list-style: none; display: grid; gap: 24px; }
.principles li { display: grid; grid-template-columns: 38px 1fr; gap: 14px; }
.principles b { display: block; font-size: 18px; }
.principles span { color: var(--muted); }
.check { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; color: var(--blue-deep); background: var(--blue-soft); font-weight: 800; }

.legal-main { width: min(860px, calc(100% - 40px)); margin: 0 auto; padding: 80px 0 110px; }
.legal-main h1 { margin: 0 0 8px; font-size: clamp(38px, 6vw, 58px); letter-spacing: -.04em; }
.legal-main .updated { margin: 0 0 46px; color: var(--muted); }
.legal-main h2 { margin: 46px 0 10px; font-size: 25px; }
.legal-main h3 { margin: 28px 0 8px; font-size: 19px; }
.legal-main p, .legal-main li { color: #46515d; }
.legal-main ul { padding-left: 1.35em; }
.legal-callout { margin: 32px 0; padding: 22px 24px; border-left: 4px solid var(--blue); background: var(--blue-soft); border-radius: 0 12px 12px 0; }
.support-box { margin-top: 36px; padding: 30px; border: 1px solid var(--line); border-radius: 16px; background: #f8fbfe; }

.join-page { min-height: 100vh; display: grid; place-items: center; padding: 28px; background: #eef1f5; }
.join-card { width: min(520px, 100%); padding: clamp(34px, 7vw, 58px); border: 1px solid var(--line); border-radius: 28px; background: #fff; box-shadow: 0 24px 70px rgb(40 72 101 / 14%); text-align: center; }
.join-brand { width: fit-content; margin: 0 auto 38px; }
.join-kicker { margin: 0 0 8px; color: var(--blue-deep); font-size: 14px; font-weight: 760; letter-spacing: .08em; }
.join-card h1 { margin: 0; font-size: clamp(32px, 7vw, 46px); line-height: 1.2; letter-spacing: -.035em; }
.join-card > p:not(.join-kicker):not(.join-help) { margin: 18px 0 28px; color: #4f5b69; font-size: 18px; }
.join-button { width: 100%; }
.join-help { margin: 22px 0 0; color: var(--muted); font-size: 14px; }

.site-footer { border-top: 1px solid var(--line); }
.footer-inner { width: min(var(--max), calc(100% - 40px)); min-height: 102px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--muted); font-size: 14px; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }

@media (max-width: 850px) {
  .nav { min-height: 64px; }
  .nav-links { gap: 16px; font-size: 14px; }
  .hero { grid-template-columns: 1fr; padding-top: 64px; text-align: center; }
  .hero h1, .hero p { margin-inline: auto; }
  .phone-stage { min-height: 600px; }
  .feature { grid-template-columns: 72px 1fr; gap: 24px; }
  .feature-preview { grid-column: 2; }
  .privacy-home { grid-template-columns: 1fr; gap: 54px; }
}

@media (max-width: 560px) {
  .nav { width: min(100% - 28px, var(--max)); }
  .brand { font-size: 21px; }
  .brand-mark { width: 34px; height: 34px; box-shadow: 0 0 0 5px var(--blue-soft); }
  .nav-links a:first-child { display: none; }
  .hero, .features, .privacy-home, .footer-inner, .legal-main { width: min(100% - 30px, var(--max)); }
  .hero h1 { font-size: 44px; }
  .phone { transform: scale(.9); }
  .feature { grid-template-columns: 1fr; padding: 42px 0; }
  .feature-icon { width: 64px; height: 64px; }
  .feature-preview { grid-column: 1; }
  .footer-inner { padding: 26px 0; display: grid; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }