:root {
  color-scheme: light;
  --paper: #f4f1e7;
  --surface: #fffdf7;
  --ink: #11130f;
  --muted: #65695f;
  --line: #d4d1c5;
  --acid: #cafa4f;
  --acid-ink: #10140a;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: clip;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Noto Sans TC", sans-serif;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: .22em; }
h1, h2, h3, p { margin-top: 0; }

.shell { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; letter-spacing: -.04em; text-decoration: none; }
.brand-mark { position: relative; width: 27px; height: 27px; background: var(--ink); }
.brand-mark::after { content: ""; position: absolute; right: -5px; bottom: -4px; width: 13px; height: 16px; background: var(--acid); transform: skew(-12deg); }
nav { display: flex; gap: 24px; font-size: .9rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a:focus-visible { color: var(--ink); }
.header-tools { display: flex; align-items: center; gap: 22px; }
.language-picker { position: relative; display: inline-flex; align-items: center; }
.language-picker::after { content: "⌄"; position: absolute; right: 11px; top: 50%; transform: translateY(-57%); color: var(--muted); font-size: .82rem; pointer-events: none; }
.language-picker select {
  min-height: 38px;
  max-width: 132px;
  padding: 0 31px 0 12px;
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: .78rem;
  font-weight: 760;
  cursor: pointer;
}
.language-picker select:hover, .language-picker select:focus-visible { border-color: var(--ink); outline: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.hero { min-height: calc(100svh - 84px); display: grid; align-items: center; padding: clamp(64px, 8vw, 118px) 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(350px, .78fr); align-items: center; gap: clamp(52px, 9vw, 130px); }
.eyebrow { margin-bottom: 22px; color: var(--muted); font-size: .74rem; font-weight: 850; letter-spacing: .16em; text-transform: uppercase; }
h1 { max-width: 780px; margin-bottom: 28px; font-size: clamp(3.6rem, 7.2vw, 7.15rem); font-weight: 900; letter-spacing: -.082em; line-height: .88; text-wrap: balance; }
h1 span { color: #3c4c18; }
.hero-lede { max-width: 650px; color: var(--muted); font-size: clamp(1.05rem, 1.8vw, 1.28rem); }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 36px; min-height: 58px; padding: 0 22px 0 26px; background: var(--acid); color: var(--acid-ink); border: 1px solid var(--ink); font-weight: 820; text-decoration: none; }
.button span:last-child { transition: transform 180ms ease; }
.button:hover span:last-child, .button:focus-visible span:last-child { transform: translate(3px, -3px); }
.text-link { font-weight: 760; }
.boundary { max-width: 570px; margin: 24px 0 0; padding-left: 14px; border-left: 2px solid var(--line); color: var(--muted); font-size: .87rem; }

.phone-stage { position: relative; width: min(100%, 430px); margin-inline: auto; padding: 24px; }
.phone-stage::before { content: ""; position: absolute; inset: 7% -18% -3% 20%; background: var(--acid); transform: rotate(5deg); }
.phone-frame { position: relative; overflow: hidden; max-height: min(69svh, 720px); border: 10px solid var(--ink); border-radius: 54px; background: var(--ink); box-shadow: 0 34px 90px rgb(17 19 15 / .2); }
.phone-frame img { width: 100%; height: auto; }
.signal { position: absolute; z-index: 2; padding: 10px 15px; border: 1px solid var(--ink); border-radius: 999px; background: var(--acid); color: var(--acid-ink); font-size: .76rem; font-weight: 900; letter-spacing: .02em; box-shadow: 0 10px 28px rgb(17 19 15 / .12); }
.signal-ai { top: 15%; left: -6%; transform: rotate(-6deg); }
.signal-gps { top: 47%; right: -10%; transform: rotate(7deg); }
.signal-device { bottom: 13%; left: -8%; transform: rotate(4deg); }

.signal-strip { overflow: hidden; border-block: 1px solid var(--line); }
.marquee-line { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 74px; white-space: nowrap; color: var(--muted); font-size: .76rem; font-weight: 850; letter-spacing: .1em; }
.marquee-line i { width: 5px; height: 5px; flex: 0 0 auto; border-radius: 50%; background: var(--acid); outline: 1px solid var(--ink); }

.story, .free-section, .final-cta { padding: clamp(96px, 12vw, 168px) 0; }
.section-intro { display: grid; grid-template-columns: .4fr 1.2fr; gap: 40px; align-items: start; }
.section-intro h2, .honesty h2, .final-cta h2, .document h1 { max-width: 900px; margin-bottom: 0; font-size: clamp(2.9rem, 6.4vw, 6.2rem); line-height: .94; letter-spacing: -.064em; font-weight: 880; }
.feature-list { margin-top: 78px; border-top: 1px solid var(--line); }
.feature-row { display: grid; grid-template-columns: 80px minmax(220px, .65fr) minmax(300px, 1fr); gap: 30px; padding: 36px 0; border-bottom: 1px solid var(--line); }
.step-number { color: var(--muted); font-variant-numeric: tabular-nums; font-weight: 760; }
.feature-row h3 { margin: 0; font-size: 1.55rem; letter-spacing: -.03em; }
.feature-row p { max-width: 650px; margin: 0; color: var(--muted); font-size: 1.02rem; }

.honesty { padding: clamp(96px, 12vw, 168px) 0; background: var(--ink); color: var(--paper); }
.honesty-grid { display: grid; grid-template-columns: .35fr 1fr .7fr; gap: 52px; align-items: end; }
.honesty .eyebrow, .honesty p { color: #afb2a8; }
.honesty p { margin-bottom: 0; }

.free-section .section-intro { margin-bottom: 74px; }
.ad-rules { border-top: 1px solid var(--line); }
.ad-rule { display: grid; grid-template-columns: minmax(120px, .32fr) 1fr; gap: 30px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.ad-rule strong { font-size: 1.4rem; }
.ad-rule p { max-width: 720px; margin: 0; color: var(--muted); }

.final-cta { border-top: 1px solid var(--line); }
.final-cta .actions { justify-content: space-between; }
.launch-note { display: inline-flex; min-height: 56px; align-items: center; padding: 0 22px; background: var(--acid); color: var(--acid-ink); font-weight: 820; }

.document { max-width: 820px; padding: 92px 0 132px; }
.document h1 { margin-bottom: 24px; }
.document .lede { color: var(--muted); font-size: 1.18rem; }
.document h2 { margin-top: 62px; font-size: 1.65rem; letter-spacing: -.035em; }
.document h3 { margin-top: 34px; }
.document li + li { margin-top: 9px; }
.document .meta { margin-bottom: 54px; color: var(--muted); font-size: .9rem; }
.notice { margin: 34px 0; padding: 24px; border-left: 5px solid var(--acid); background: var(--surface); }

.faq { margin-top: 54px; border-top: 1px solid var(--line); }
.faq details { padding: 24px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-size: 1.05rem; font-weight: 800; }
.faq details p { max-width: 700px; margin: 14px 0 0; color: var(--muted); }

.site-footer { margin-top: 0; padding: 54px 0; background: var(--ink); color: var(--paper); }
.footer-row { display: flex; justify-content: space-between; gap: 30px; }
.footer-links { display: flex; gap: 20px; }
.site-footer a { color: var(--paper); }

.js [data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 650ms ease, transform 650ms cubic-bezier(.2,.75,.25,1); }
.js [data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: no-preference) {
  .phone-stage { animation: float 5.5s ease-in-out infinite; }
  .signal-ai { animation: tag-one 4.8s ease-in-out infinite; }
  .signal-gps { animation: tag-two 5.3s ease-in-out infinite; }
  @keyframes float { 50% { transform: translateY(-10px) rotate(.35deg); } }
  @keyframes tag-one { 50% { transform: translate(-5px, -8px) rotate(-3deg); } }
  @keyframes tag-two { 50% { transform: translate(5px, 7px) rotate(4deg); } }
}

@media (max-width: 820px) {
  .shell { width: min(calc(100% - 30px), var(--max)); }
  .site-header { display: grid; grid-template-columns: minmax(0, 1fr) auto; min-height: 72px; padding: 15px 0; row-gap: 11px; }
  .header-tools { display: contents; }
  nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-end; gap: 18px; font-size: .78rem; }
  nav a:first-child { display: none; }
  .language-picker { grid-column: 2; grid-row: 1; justify-self: end; }
  .language-picker select { width: 46px; color: transparent; padding-inline: 0; }
  .language-picker::before { content: "文"; position: absolute; left: 14px; color: var(--ink); font-size: .8rem; font-weight: 850; pointer-events: none; }
  .language-picker::after { right: 7px; }
  .hero { min-height: auto; padding: 68px 0 96px; }
  .hero-grid { grid-template-columns: 1fr; gap: 64px; }
  h1 { font-size: clamp(3.25rem, 16vw, 5.6rem); }
  .phone-stage { width: min(88vw, 430px); }
  .phone-frame { max-height: 650px; }
  .marquee-line { justify-content: flex-start; overflow: hidden; }
  .section-intro, .honesty-grid { grid-template-columns: 1fr; gap: 24px; }
  .feature-row { grid-template-columns: 48px 1fr; }
  .feature-row p { grid-column: 2; }
  .ad-rule { grid-template-columns: 1fr; gap: 8px; }
  .final-cta .actions { align-items: flex-start; flex-direction: column; }
  .footer-row { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .phone-stage, .signal { animation: none !important; }
}