:root {
  --ink: #182034;
  --muted: #687287;
  --pink: #e84393;
  --blue: #4ca7ed;
  --paper: #fff9fc;
  --soft-blue: #f3f8ff;
  --line: rgba(24, 32, 52, 0.1);
  --shadow: 0 28px 80px rgba(51, 65, 102, 0.15);
  --shell: min(1180px, calc(100vw - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
.shell { width: var(--shell); margin: 0 auto; }
.skip-link { position: fixed; z-index: 100; left: 16px; top: -60px; padding: 10px 16px; border-radius: 10px; background: #fff; }
.skip-link:focus { top: 16px; }

.app-header { position: fixed; z-index: 50; inset: 0 0 auto; border-bottom: 1px solid transparent; transition: 0.25s ease; }
.app-header.is-scrolled { border-color: var(--line); background: rgba(255, 255, 255, 0.86); backdrop-filter: blur(18px); }
.header-inner { height: 76px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand img { width: 44px; height: 44px; border-radius: 14px; }
.brand span { display: flex; flex-direction: column; line-height: 1.15; }
.brand strong { font-size: 18px; }
.brand small { margin-top: 5px; color: var(--muted); font-size: 11px; letter-spacing: 0.04em; }
.app-nav { display: flex; align-items: center; gap: 28px; }
.app-nav a { font-size: 14px; font-weight: 700; text-decoration: none; }
.app-nav .nav-download { padding: 11px 19px; border-radius: 999px; color: #fff; background: var(--ink); }
.menu-toggle { display: none; border: 0; background: none; color: var(--ink); font: inherit; font-weight: 750; }

.hero { position: relative; min-height: 900px; overflow: hidden; background: linear-gradient(180deg, #fff 0%, var(--paper) 62%, var(--soft-blue) 100%); }
.hero-grid { position: relative; z-index: 2; min-height: 900px; padding: 140px 0 80px; display: grid; grid-template-columns: 0.94fr 1.06fr; align-items: center; gap: 56px; }
.hero-grid > * { min-width: 0; }
.eyebrow { margin: 0 0 20px; color: var(--pink); font-size: 13px; font-weight: 850; letter-spacing: 0.12em; }
.hero h1 { margin: 0; font-size: clamp(56px, 6.3vw, 88px); line-height: 1.03; letter-spacing: -0.055em; text-wrap: pretty; }
.hero-lead { max-width: 620px; margin: 30px 0 0; color: #4f5a70; font-size: clamp(18px, 1.7vw, 22px); line-height: 1.85; text-wrap: pretty; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.button { min-height: 54px; padding: 0 25px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 999px; font-weight: 800; text-decoration: none; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: linear-gradient(100deg, var(--pink), #f273ad 50%, var(--blue)); box-shadow: 0 16px 34px rgba(232, 67, 147, 0.23); }
.button-secondary { border-color: var(--line); background: rgba(255, 255, 255, 0.8); }
.download-note { margin: 18px 0 0; color: #8993a5; font-size: 12px; }
.hero-orb { position: absolute; border-radius: 50%; filter: blur(20px); opacity: 0.52; }
.hero-orb-pink { width: 460px; height: 460px; right: -180px; top: 60px; background: #fbd5e8; }
.hero-orb-blue { width: 520px; height: 520px; left: -250px; bottom: -180px; background: #d8edff; }
.hero-stage { position: relative; height: 690px; }
.phone { overflow: hidden; border: 10px solid #fff; border-radius: 48px; background: #eaf0f8; box-shadow: var(--shadow); }
.phone img { width: 100%; height: 100%; object-fit: cover; }
.phone-main { position: absolute; z-index: 3; left: 50%; top: 0; width: 314px; height: 660px; transform: translateX(-50%); }
.phone-side { position: absolute; top: 100px; width: 225px; height: 500px; opacity: 0.9; }
.phone-side-left { z-index: 1; left: 0; transform: rotate(-8deg); }
.phone-side-right { z-index: 2; right: 0; transform: rotate(8deg); }
.stage-badge { position: absolute; z-index: 5; right: 8px; bottom: 42px; padding: 17px 21px; border: 1px solid rgba(255,255,255,0.8); border-radius: 21px; background: rgba(255,255,255,0.78); box-shadow: 0 16px 38px rgba(44,65,100,0.14); backdrop-filter: blur(16px); }
.stage-badge strong, .stage-badge span { display: block; }
.stage-badge strong { font-size: 23px; }
.stage-badge span { margin-top: 3px; color: var(--muted); font-size: 12px; }

.trust-strip { border-block: 1px solid var(--line); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-grid div { padding: 30px; border-left: 1px solid var(--line); }
.trust-grid div:last-child { border-right: 1px solid var(--line); }
.trust-grid strong, .trust-grid span { display: block; }
.trust-grid strong { font-size: 22px; }
.trust-grid span { margin-top: 6px; color: var(--muted); font-size: 13px; }

.start-section { padding: 104px 0 0; background: #fff; }
.start-intro { max-width: 760px; }
.start-intro h2 { margin: 0; font-size: clamp(39px, 5vw, 66px); line-height: 1.08; letter-spacing: -0.048em; }
.start-intro > p:last-child { max-width: 670px; margin: 22px 0 0; color: var(--muted); font-size: 18px; line-height: 1.82; }
.start-steps { margin: 54px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); list-style: none; }
.start-steps li { min-height: 210px; padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.start-steps strong { display: block; color: var(--blue); font-size: 16px; letter-spacing: 0.08em; }
.start-steps h3 { margin: 34px 0 8px; font-size: 21px; line-height: 1.35; }
.start-steps p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.72; }

.section { padding: 130px 0; }
.section-heading { max-width: 820px; margin-bottom: 60px; }
.section-heading h2, .tools-copy h2, .download-copy h2 { margin: 0; font-size: clamp(40px, 5.2vw, 70px); line-height: 1.08; letter-spacing: -0.048em; text-wrap: pretty; }
.value-section { overflow: hidden; background: #fff; }
.value-grid { display: grid; gap: 28px; }
.value-card { position: relative; min-height: 610px; padding: 60px 72px; display: grid; grid-template-columns: 1fr 350px; align-items: center; gap: 70px; overflow: hidden; border: 1px solid var(--line); border-radius: 44px; background: linear-gradient(145deg, #fff8fc, #f2f8ff); }
.value-card-reverse { background: linear-gradient(145deg, #f0f7ff, #fffaf4); }
.value-card .number { position: absolute; left: 30px; top: 24px; color: rgba(76,167,237,0.23); font-size: 76px; font-weight: 900; letter-spacing: -0.08em; }
.value-copy { position: relative; z-index: 2; }
.value-copy .label { margin: 0 0 14px; color: var(--pink); font-size: 13px; font-weight: 850; letter-spacing: 0.12em; }
.value-copy h3 { max-width: 590px; margin: 0; font-size: clamp(36px, 4vw, 58px); line-height: 1.12; letter-spacing: -0.04em; }
.value-copy > p:last-child { max-width: 590px; margin: 22px 0 0; color: var(--muted); font-size: 18px; line-height: 1.85; }
.value-phone { width: 300px; height: 600px; margin: 42px auto -120px; transform: rotate(1.5deg); }
.value-card-reverse .value-phone { transform: rotate(-1.5deg); }

.tools-section { overflow: hidden; background: #f6f8fc; }
.tools-grid { display: grid; grid-template-columns: 1.08fr 0.92fr; align-items: center; gap: 90px; }
.tools-stage { position: relative; height: 720px; }
.tools-phone { position: absolute; width: 310px; height: 660px; }
.tools-phone-front { z-index: 2; left: 30px; top: 0; transform: rotate(-5deg); }
.tools-phone-back { right: 20px; top: 55px; transform: rotate(7deg); }
.tools-copy > .eyebrow { margin-bottom: 18px; }
.tool-list { margin-top: 38px; border-top: 1px solid var(--line); }
.tool-list article { padding: 24px 0; display: grid; grid-template-columns: 86px 1fr; gap: 18px; border-bottom: 1px solid var(--line); }
.tool-list article > span { color: var(--pink); font-size: 13px; font-weight: 850; }
.tool-list h3 { margin: 0; font-size: 21px; }
.tool-list p { margin: 9px 0 0; color: var(--muted); line-height: 1.7; }

.download-section { padding-bottom: 100px; }
.download-card { min-height: 520px; padding: 74px 80px; display: grid; grid-template-columns: 1fr 300px; align-items: center; gap: 76px; overflow: hidden; border-radius: 48px; color: #fff; background: linear-gradient(125deg, #182034 0%, #293a59 58%, #503752 100%); }
.download-icon { width: 82px; height: 82px; margin-bottom: 28px; border-radius: 24px; }
.download-copy > p:not(.eyebrow) { max-width: 650px; margin: 24px 0 0; color: #cbd5e1; font-size: 18px; line-height: 1.75; }
.button-light { color: var(--ink); background: #fff; }
.button-outline { color: #fff; border-color: rgba(255,255,255,0.32); }
.qr-card { padding: 22px; border-radius: 28px; color: var(--ink); background: #fff; text-align: center; }
.qr-card img { width: 100%; border-radius: 14px; }
.qr-card strong, .qr-card span { display: block; }
.qr-card strong { margin-top: 13px; }
.qr-card span { margin-top: 4px; color: var(--muted); font-size: 12px; }

.app-footer { padding: 58px 0; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 26px; }
.footer-brand p, .copyright { color: var(--muted); font-size: 13px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-links a { color: var(--muted); font-size: 13px; text-decoration: none; }
.copyright { grid-column: 1 / -1; margin: 0; }

.app-mobile-download { display: none; }

.wechat-guide { position: fixed; z-index: 200; inset: 0; padding: 90px 34px 30px; color: #fff; background: rgba(15,23,42,0.94); text-align: right; }
.wechat-guide button { position: absolute; left: 22px; top: 20px; width: 42px; height: 42px; border: 1px solid rgba(255,255,255,0.3); border-radius: 50%; color: #fff; background: transparent; font-size: 27px; }
.guide-arrow { font-size: 68px; line-height: 1; }
.wechat-guide strong { display: block; margin-top: 20px; font-size: 24px; }
.wechat-guide p { color: #d9e0ec; font-size: 16px; }
.wechat-ios-guide { max-width: 340px; margin: 18px auto 0; text-align: center; }
.wechat-ios-guide strong { margin-top: 0; }
.wechat-ios-guide img { display: block; width: min(240px, 70vw); margin: 24px auto 18px; border: 12px solid #fff; border-radius: 22px; background: #fff; }
.wechat-ios-guide span { display: block; color: #b8c2d3; font-size: 13px; line-height: 1.7; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1020px) {
  .hero-grid, .tools-grid { grid-template-columns: 1fr; }
  .hero-grid { padding-top: 132px; gap: 26px; }
  .hero-stage { max-width: 680px; width: 100%; margin: auto; }
  .tools-grid { gap: 50px; }
  .tools-stage { max-width: 700px; width: 100%; margin: auto; }
}

@media (max-width: 760px) {
  :root { --shell: min(100% - 28px, 1180px); }
  .header-inner { height: 66px; }
  .menu-toggle { display: block; }
  .app-nav { position: absolute; left: 14px; right: 14px; top: 72px; padding: 18px; display: none; align-items: stretch; flex-direction: column; gap: 0; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
  .app-nav.is-open { display: flex; }
  .app-nav a { padding: 13px; }
  .app-nav .nav-download { text-align: center; }
  .hero, .hero-grid { min-height: auto; }
  .hero-grid { padding: 116px 0 60px; }
  .hero h1 { font-size: clamp(45px, 13vw, 60px); }
  .hero-stage { height: 550px; }
  .phone-main { width: 255px; height: 520px; }
  .phone-side { top: 78px; width: 170px; height: 380px; }
  .phone-side-left { left: -28px; }
  .phone-side-right { right: -28px; }
  .stage-badge { right: 0; bottom: 22px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-grid div { padding: 22px 14px; }
  .start-section { padding-top: 80px; }
  .start-intro > p:last-child { font-size: 16px; }
  .start-steps { margin-top: 34px; grid-template-columns: 1fr; }
  .start-steps li { min-height: 0; padding: 22px; display: grid; grid-template-columns: 52px 1fr; gap: 12px; }
  .start-steps h3 { margin: 0 0 7px; font-size: 19px; }
  .start-steps strong { padding-top: 2px; }
  .section { padding: 90px 0; }
  .section-heading { margin-bottom: 38px; }
  .value-grid { gap: 18px; }
  .value-card { min-height: 0; padding: 76px 24px 0; grid-template-columns: 1fr; gap: 10px; border-radius: 30px; }
  .value-card .number { left: 22px; top: 12px; font-size: 58px; }
  .value-copy > p:last-child { font-size: 16px; }
  .value-phone { width: 255px; height: 510px; margin: 20px auto -86px; }
  .tools-stage { height: 570px; }
  .tools-phone { width: 235px; height: 500px; }
  .tools-phone-front { left: 0; }
  .tools-phone-back { right: 0; }
  .tool-list article { grid-template-columns: 72px 1fr; }
  .download-card { padding: 48px 24px; grid-template-columns: 1fr; border-radius: 30px; }
  .qr-card { max-width: 260px; }
  .footer-grid { grid-template-columns: 1fr; }
  .copyright { grid-column: auto; }
  body { padding-bottom: 78px; }
  .app-mobile-download { position: fixed; z-index: 80; right: 14px; bottom: 14px; left: 14px; display: block; padding: 8px; border: 1px solid rgba(255, 255, 255, 0.78); border-radius: 19px; background: rgba(255, 255, 255, 0.88); box-shadow: 0 16px 36px rgba(23, 32, 51, 0.16); backdrop-filter: blur(16px); }
  .app-mobile-download a { display: block; padding: 14px 20px; border-radius: 13px; color: #fff; background: linear-gradient(100deg, var(--pink), #f273ad 50%, var(--blue)); font-weight: 800; text-align: center; text-decoration: none; }
}

@media (max-width: 430px) {
  .brand small { display: none; }
  .hero-actions .button { width: 100%; }
  .hero-stage { height: 500px; }
  .phone-main { width: 230px; height: 470px; }
  .phone-side { width: 145px; height: 330px; }
  .stage-badge { padding: 13px 16px; }
  .section-heading h2, .tools-copy h2, .download-copy h2 { font-size: 39px; }
  .tools-stage { height: 500px; }
  .tools-phone { width: 205px; height: 440px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .button { transition: none; }
}