/* 版式：深色首屏 + 暖白正文 + 深色隐私区，单一珊瑚红强调色；设备画面用 CSS 绘制 */
:root {
  --paper: #f6f2ee;
  --paper-2: #efe8e3;
  --ink: #1d191a;
  --ink-2: #5c5356;
  --night: #121014;
  --night-2: #1b181c;
  --night-line: #2c272b;
  --on-night: #f3eeee;
  --on-night-2: #a39a9d;
  --brand: #f2384f;
  --brand-soft: #fde4e7;
  --brand-glow: rgba(242, 56, 79, 0.28);
  --hl: #ffd84d;
  --line: #e2d9d4;
  --s1: #f2384f; --s2: #2a78db; --s3: #1f9a66;

  --font: -apple-system, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --gutter: clamp(20px, 5vw, 64px);
  --max: 1180px;
  --radius: 20px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.01em; text-wrap: balance; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible, button:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 8px; }
em { font-style: normal; color: var(--brand); }

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px var(--gutter);
  padding-top: calc(14px + env(safe-area-inset-top, 0px));
  background: rgba(18, 16, 20, 0.82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--night-line);
  color: var(--on-night);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; font-size: 18px; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 50%;
  background: radial-gradient(circle, var(--brand) 0 46%, transparent 47%), #fff;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.08);
}
.brand-en { font-weight: 500; font-size: .78em; letter-spacing: .02em; opacity: .6; margin-left: -4px; }
.nav-links { display: flex; gap: 28px; font-size: 14px; color: var(--on-night-2); }
.nav-links a:hover { color: var(--on-night); }
.nav-cta {
  font-size: 14px; font-weight: 600; padding: 8px 16px; border-radius: 999px;
  background: var(--brand); color: #fff;
}
@media (max-width: 760px) { .nav-links { display: none; } }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px; font-weight: 600; font-size: 15px;
  transition: transform .2s ease, background-color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-light { background: var(--brand); color: #fff; box-shadow: 0 8px 24px var(--brand-glow); }
.btn-ghost { color: var(--on-night); border: 1px solid var(--night-line); }
.btn-ghost:hover { border-color: var(--on-night-2); }
.btn-dark { background: var(--ink); color: #fff; }
.btn[aria-disabled="true"] { opacity: .55; pointer-events: none; }

.eyebrow { font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--on-night-2); font-weight: 600; }
.eyebrow.dark { color: var(--brand); }

/* 首屏 */
.hero {
  background: radial-gradient(1200px 600px at 75% 40%, #2a1418 0%, transparent 60%), var(--night);
  color: var(--on-night);
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 40px; align-items: center;
  padding: clamp(56px, 9vw, 120px) var(--gutter) clamp(64px, 9vw, 120px);
  max-width: none;
}
.hero > * { max-width: calc(var(--max) / 2 + 40px); }
.hero-copy { justify-self: end; width: 100%; display: flex; flex-direction: column; gap: 22px; }
.hero h1 { font-size: clamp(40px, 6vw, 68px); line-height: 1.12; font-weight: 600; }
.lede { color: var(--on-night-2); font-size: clamp(16px, 1.6vw, 18px); max-width: 30em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }
.hero-facts { list-style: none; margin: 18px 0 0; padding: 22px 0 0; border-top: 1px solid var(--night-line);
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; font-size: 13px; color: var(--on-night-2); }
.hero-facts strong { display: block; font-size: 26px; color: var(--on-night); font-weight: 600; line-height: 1.2; }

.hero-devices { position: relative; height: 560px; width: 100%; justify-self: start; }
.ring { position: absolute; inset: 50% auto auto 50%; width: 460px; height: 460px; transform: translate(-50%, -50%);
  border-radius: 50%; border: 1px solid var(--night-line); box-shadow: 0 0 120px var(--brand-glow) inset; }
.label { position: absolute; bottom: -30px; left: 50%; transform: translateX(-50%); font-size: 10px; letter-spacing: .3em; color: var(--on-night-2); white-space: nowrap; }

/* 手表 */
.watch { position: absolute; left: 0; top: 190px; width: 158px; height: 190px; transform: rotate(-8deg); z-index: 1; }
.watch::before, .watch::after { content: ""; position: absolute; left: 22px; right: 22px; height: 70px; background: #2a2629; border-radius: 18px; z-index: -1; }
.watch::before { top: -52px; } .watch::after { bottom: -52px; }
.watch-screen {
  position: absolute; inset: 0; border-radius: 44px; background: #000; border: 8px solid #3a3437;
  box-shadow: 0 30px 60px rgba(0,0,0,.5);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; color: #fff;
}
.w-time { position: absolute; top: 12px; right: 20px; font-size: 10px; font-weight: 600; }
.w-timer { font-family: var(--mono); font-size: 26px; margin-top: 8px; }
.w-level { width: 70%; height: 4px; background: rgba(242,56,79,.3); border-radius: 2px; overflow: hidden; }
.w-level i { display: block; height: 100%; width: 55%; background: var(--brand); animation: level 1.2s ease-in-out infinite alternate; }
@keyframes level { to { width: 82%; } }
.w-btns { display: flex; gap: 6px; }
.w-btns span { width: 30px; height: 26px; border-radius: 9px; background: var(--brand); position: relative; }
.w-pause::after { content: ""; position: absolute; inset: 8px 11px; border-left: 3px solid #fff; border-right: 3px solid #fff; }
.w-stop::after { content: ""; position: absolute; inset: 8px 10px; background: #fff; border-radius: 2px; }
.w-flag::after { content: ""; position: absolute; left: 11px; top: 7px; width: 9px; height: 7px; background: #fff; clip-path: polygon(0 0, 100% 30%, 0 70%); box-shadow: -1px 0 0 #fff; }
.watch .label { bottom: -86px; }

/* 手机 */
.phone {
  position: relative; width: 270px; aspect-ratio: 9 / 19.3; border-radius: 44px; padding: 10px;
  background: linear-gradient(145deg, #3d373a, #1c191a);
  box-shadow: 0 40px 80px rgba(0,0,0,.45), inset 0 0 0 1px rgba(255,255,255,.08);
}
.hero-phone { position: absolute; right: 2%; top: 10px; transform: rotate(5deg); }
.screen {
  position: relative; height: 100%; border-radius: 35px; overflow: hidden; background: #fff; color: #151314;
  font-size: 11px; line-height: 1.45; padding: 0 14px 14px;
}
.sb { display: flex; justify-content: space-between; align-items: center; height: 38px; font-size: 10px; font-weight: 600; }
.sb.light { color: #fff; }
.island { width: 74px; height: 21px; border-radius: 12px; background: #000; }
.app-head { display: flex; justify-content: space-between; color: var(--brand); font-weight: 600; padding: 2px 0 6px; }
.dots { width: 20px; height: 20px; border: 1.5px solid var(--brand); border-radius: 50%; font-size: 9px; text-align: center; line-height: 15px; }
.app-title { font-size: 16px; font-weight: 700; }
.app-meta { color: #8a8285; font-size: 9.5px; margin: 1px 0 8px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; background: #f1edee; border-radius: 8px; padding: 2px; font-size: 10px; text-align: center; margin-bottom: 9px; }
.seg span { padding: 3px 0; border-radius: 6px; color: #8a8285; }
.seg .on { background: #fff; color: #151314; font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,.12); }
.tldr { background: var(--brand-soft); border-radius: 9px; padding: 7px 9px; font-size: 10.5px; margin-bottom: 8px; }
.tldr b { display: block; color: var(--brand); font-size: 8.5px; letter-spacing: .05em; }
.nh { font-weight: 700; font-size: 11.5px; margin: 8px 0 3px; }
.bl, .todo { position: relative; font-size: 10.5px; padding-left: 12px; margin-bottom: 4px; padding-right: 36px; }
.bl::before { content: "•"; position: absolute; left: 1px; color: #8a8285; }
.todo i { position: absolute; left: 0; top: 3px; width: 8px; height: 8px; border: 1.3px solid #8a8285; border-radius: 2px; }
.ts { position: absolute; right: 0; top: 0; font-family: var(--mono); font-size: 8.5px; color: var(--brand); border: 1px solid var(--brand); border-radius: 8px; padding: 0 4px; }
.player { position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 16px 16px; background: #f7f4f4; border-top: 1px solid #ece6e7; }
.player .bar { height: 3px; border-radius: 2px; background: #e6dfe0; position: relative; }
.player .bar::before { content: ""; position: absolute; inset: 0 62% 0 0; background: var(--brand); border-radius: 2px; }
.player .row { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; color: var(--brand); font-size: 9px; font-family: var(--mono); }
.player .play { width: 30px; height: 30px; border-radius: 50%; background: var(--brand); position: relative; }
.player .play::after { content: ""; position: absolute; left: 12px; top: 9px; border-left: 9px solid #fff; border-top: 6px solid transparent; border-bottom: 6px solid transparent; }
.tags { display: flex; gap: 4px; margin-top: 8px; }
.tags span { font-size: 9px; background: #f1edee; color: #8a8285; padding: 1px 7px; border-radius: 8px; }

/* 体验 */
.experience { padding: clamp(80px, 10vw, 140px) var(--gutter); max-width: calc(var(--max) + 2 * var(--gutter)); margin: 0 auto; }
.exp-intro { display: flex; flex-direction: column; gap: 14px; margin-bottom: 56px; }
.exp-intro h2, .sec-head h2 { font-size: clamp(30px, 4.2vw, 46px); line-height: 1.2; }
.exp-body { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(32px, 6vw, 96px); }
.exp-stage { position: sticky; top: 96px; align-self: start; display: flex; justify-content: center; padding: 20px 0 40px; }
.stage-phone { width: min(290px, calc((100vh - 150px) * 0.466)); }
.stage-phone .screen { font-size: clamp(8px, 1.5vh, 11px); }
.pane { position: absolute; inset: 0; padding: 0 14px 14px; opacity: 0; transform: translateY(10px); transition: opacity .45s ease, transform .45s ease; }
.pane.is-active { opacity: 1; transform: none; }
.pane-rec { background: var(--brand); color: #fff; display: flex; flex-direction: column; align-items: center; text-align: center; }
.rec-state { font-weight: 600; font-size: 11px; opacity: .85; margin-top: 18px; }
.rec-timer { font-family: var(--mono); font-size: 40px; font-weight: 500; margin: 6px 0 4px; }
.rec-wave { display: flex; align-items: center; justify-content: center; gap: 3px; height: 74px; width: 100%; }
.rec-wave b { width: 3px; border-radius: 2px; background: #fff; }
@media (prefers-reduced-motion: no-preference) { .rec-wave b { animation: bar 1s ease-in-out infinite alternate; } }
@keyframes bar { to { transform: scaleY(.35); } }
.rec-input { font-size: 10px; opacity: .9; }
.rec-live { margin-top: 14px; background: rgba(255,255,255,.16); border-radius: 12px; padding: 10px 12px; font-size: 11px; text-align: left; line-height: 1.6; }
.rec-live span { opacity: .6; }
.rec-ctl { margin-top: auto; display: flex; align-items: center; gap: 34px; padding-bottom: 18px; font-size: 10px; }
.rec-ctl b { width: 54px; height: 54px; border-radius: 50%; background: #fff; position: relative; }
.rec-ctl b::after { content: ""; position: absolute; inset: 18px; background: var(--brand); border-radius: 4px; }
.tx-engine { color: #8a8285; font-size: 9.5px; margin-bottom: 6px; }
.spk { font-size: 10px; font-weight: 700; margin: 8px 0 3px; }
.spk::before { content: "● "; }
.s1 { color: var(--s1); } .s2 { color: var(--s2); } .s3 { color: var(--s3); }
.tx { display: grid; grid-template-columns: 34px 1fr; font-size: 11px; margin-bottom: 4px; }
.tx i { font-style: normal; font-family: var(--mono); font-size: 8.5px; color: #8a8285; padding-top: 2px; }
.tx.now { background: linear-gradient(transparent 8%, var(--hl) 8% 92%, transparent 92%); background-size: 100% 100%; background-repeat: no-repeat; background-position: 34px 0; }

.exp-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.exp-step { min-height: 62vh; display: flex; flex-direction: column; justify-content: center; gap: 12px; padding: 20px 0; opacity: .35; transition: opacity .4s ease; }
.exp-step.is-active { opacity: 1; }
.step-no { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--brand-soft); color: var(--brand); font-weight: 700; }
.exp-step h3 { font-size: clamp(22px, 2.6vw, 30px); line-height: 1.3; }
.exp-step p { color: var(--ink-2); max-width: 30em; }

/* 功能 */
.features { padding: clamp(80px, 10vw, 130px) var(--gutter); background: var(--paper-2); }
.features > * { max-width: var(--max); margin-left: auto; margin-right: auto; }
.sec-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: 48px; }
.feature-main { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.feature-main article { background: var(--paper); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; gap: 12px; border: 1px solid var(--line); }
.num { font-family: var(--mono); font-size: 13px; color: var(--brand); }
.feature-main h3 { font-size: 21px; }
.feature-main p { color: var(--ink-2); font-size: 15px; }
.feature-more { list-style: none; padding: 0; margin-top: 40px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 32px; }
.feature-more li { padding: 18px 0; border-top: 1px solid var(--line); font-size: 14.5px; color: var(--ink-2); }
.feature-more b { display: block; color: var(--ink); font-size: 15.5px; margin-bottom: 2px; }

/* 隐私 */
.privacy { background: var(--night); color: var(--on-night); padding: clamp(80px, 10vw, 130px) var(--gutter);
  display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: clamp(32px, 6vw, 96px); align-items: center; }
.privacy > * { max-width: 620px; }
.privacy-art { justify-self: end; }
.orb { width: min(320px, 70vw); aspect-ratio: 1; border-radius: 50%; display: grid; place-items: center;
  background: radial-gradient(circle, #2a1418 0%, transparent 70%); border: 1px solid var(--night-line); position: relative; }
.orb::before { content: ""; position: absolute; inset: 18%; border-radius: 50%; border: 1px solid var(--night-line); }
.orb span { width: 34%; aspect-ratio: 1; border-radius: 50%; background: #fff; display: grid; place-items: center; box-shadow: 0 0 80px var(--brand-glow); }
.orb span::after { content: ""; width: 74%; aspect-ratio: 1; border-radius: 50%; background: var(--brand); }
.privacy-copy { display: flex; flex-direction: column; gap: 20px; }
.privacy h2 { font-size: clamp(32px, 4.4vw, 48px); line-height: 1.2; }
.privacy-copy > p { color: var(--on-night-2); }
.privacy-table { margin: 8px 0 0; }
.privacy-table div { display: grid; grid-template-columns: 96px 1fr; gap: 16px; padding: 14px 0; border-top: 1px solid var(--night-line); font-size: 14.5px; }
.privacy-table dt { color: var(--on-night-2); }
.privacy-table dd { margin: 0; }

/* 常见问题 */
.faq { padding: clamp(80px, 10vw, 130px) var(--gutter); }
.faq > * { max-width: 820px; margin-left: auto; margin-right: auto; }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { cursor: pointer; list-style: none; padding: 22px 40px 22px 0; font-size: 17px; font-weight: 600; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%); font-size: 22px; font-weight: 300; color: var(--brand); transition: transform .2s; }
.faq-list details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-list details p { color: var(--ink-2); padding: 0 40px 22px 0; max-width: 40em; }

/* 结尾 */
.closing { text-align: center; padding: clamp(80px, 10vw, 140px) var(--gutter); display: flex; flex-direction: column; align-items: center; gap: 24px; border-top: 1px solid var(--line); }
.closing-mark { width: 56px; height: 56px; border-radius: 50%; background: radial-gradient(circle, var(--brand) 0 48%, #fff 49%); box-shadow: 0 0 0 1px var(--line), 0 10px 30px var(--brand-glow); }
.closing h2 { font-size: clamp(32px, 5vw, 54px); line-height: 1.2; }
.closing-note { color: var(--ink-2); font-size: 14px; }

/* 页脚 */
.footer { padding: 48px var(--gutter) 40px; padding-bottom: calc(40px + env(safe-area-inset-bottom, 0px));
  display: grid; grid-template-columns: 1fr auto; gap: 32px; border-top: 1px solid var(--line); max-width: calc(var(--max) + 2 * var(--gutter)); margin: 0 auto; }
.foot-brand p { color: var(--ink-2); font-size: 14px; margin-top: 10px; }
.foot-cols { display: flex; gap: 64px; }
.foot-cols div { display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.foot-cols h4 { font-size: 13px; color: var(--ink-2); font-weight: 600; margin-bottom: 4px; }
.foot-cols a:hover { color: var(--brand); }
.copy { grid-column: 1 / -1; font-size: 12px; color: var(--ink-2); }

/* 窄屏 */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { justify-self: stretch; }
  .hero-devices { height: 520px; max-width: 520px; justify-self: center; }
  .feature-main, .feature-more { grid-template-columns: 1fr; }
  .privacy { grid-template-columns: 1fr; }
  .privacy-art { justify-self: center; }
}
@media (max-width: 760px) {
  .exp-body { grid-template-columns: 1fr; }
  .exp-stage { position: sticky; top: 60px; z-index: 2; background: var(--paper); padding: 10px 0 14px;
    box-shadow: 0 12px 16px -12px rgba(0,0,0,.12); }
  /* 整台手机等比缩小，里面的文字和控件跟着缩 */
  .stage-phone { width: 270px; zoom: 0.48; }
  .stage-phone .screen { font-size: 11px; }
  .exp-step { min-height: 52vh; justify-content: flex-start; padding-top: 24px; }
  .footer { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .hero-devices { height: 430px; }
  .ring { width: 340px; height: 340px; }
  .hero-phone { transform: rotate(5deg) scale(.78); transform-origin: top right; right: 0; }
  .watch { transform: rotate(-8deg) scale(.78); left: 2%; top: 120px; }
  .hero-facts { grid-template-columns: 1fr 1fr 1fr; font-size: 12px; }
  .hero-facts strong { font-size: 22px; }
}