:root {
  --navy-950: #050b19;
  --navy-900: #071126;
  --navy-800: #0c1a35;
  --ink: #10182a;
  --muted: #647089;
  --cream: #f5f2eb;
  --white: #fff;
  --orange: #ff9f43;
  --orange-soft: #ffc676;
  --cyan: #7bdff2;
  --line: rgba(15, 27, 54, .12);
  --shadow: 0 24px 70px rgba(4, 13, 33, .18);
  --radius-lg: 32px;
  --radius-md: 22px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fbfaf7;
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
svg { display: block; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.narrow { max-width: 820px; text-align: center; }
.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; }
.skip-link { position: fixed; z-index: 999; top: 8px; left: 8px; padding: 10px 14px; background: white; color: var(--ink); border-radius: 8px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.site-header { position: fixed; z-index: 50; top: 0; left: 0; right: 0; color: white; transition: background .25s, box-shadow .25s; }
.site-header.scrolled { background: rgba(5, 11, 25, .88); box-shadow: 0 8px 30px rgba(0,0,0,.18); backdrop-filter: blur(16px); }
.nav-wrap { height: 78px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 750; letter-spacing: .02em; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: var(--orange); }
.brand-mark svg { width: 100%; fill: none; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.brand-mark.small { width: 28px; height: 28px; font-size: 20px; background: rgba(255,255,255,.08); border-radius: 9px; }
.site-nav { display: flex; align-items: center; gap: 34px; font-size: 14px; color: rgba(255,255,255,.75); }
.site-nav a { transition: color .2s; }
.site-nav a:hover, .site-nav a:focus-visible { color: white; }
.nav-cta { padding: 9px 17px; border: 1px solid rgba(255,255,255,.28); border-radius: 99px; color: white !important; }
.menu-toggle { display: none; border: 0; background: none; color: white; padding: 8px; cursor: pointer; }
.menu-toggle span:not(.sr-only) { display: block; width: 24px; height: 2px; margin: 5px; border-radius: 2px; background: currentColor; transition: transform .2s, opacity .2s; }

.hero { min-height: 820px; position: relative; display: grid; align-items: center; overflow: hidden; color: white; background: radial-gradient(circle at 75% 20%, #172b55 0, transparent 30%), linear-gradient(145deg, #050b19 0%, #091831 60%, #071126 100%); }
.hero::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 90px; background: #fbfaf7; clip-path: ellipse(58% 32% at 50% 100%); }
.hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: .88fr 1.12fr; align-items: center; gap: 60px; padding-top: 92px; padding-bottom: 80px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; padding: 7px 13px; border: 1px solid rgba(255,255,255,.13); border-radius: 99px; color: rgba(255,255,255,.72); font-size: 13px; letter-spacing: .08em; }
.eyebrow-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 18px var(--orange); }
.hero h1 { margin: 28px 0 22px; font-size: clamp(58px, 7vw, 94px); line-height: 1.03; letter-spacing: -.06em; font-weight: 780; }
.hero h1 span { color: var(--orange-soft); }
.hero-lead { max-width: 530px; margin: 0; color: rgba(255,255,255,.68); font-size: 18px; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; }
.button { min-height: 50px; display: inline-flex; justify-content: center; align-items: center; gap: 10px; padding: 0 22px; border: 1px solid transparent; border-radius: 13px; font-weight: 700; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; }
.button svg { width: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.button-primary { color: #16110b; background: var(--orange); box-shadow: 0 12px 36px rgba(255,159,67,.26); }
.button-primary:hover { background: #ffad5d; box-shadow: 0 16px 42px rgba(255,159,67,.35); }
.button-ghost { color: white; border-color: rgba(255,255,255,.18); background: rgba(255,255,255,.05); }
.hero-notes { display: flex; flex-wrap: wrap; gap: 20px; margin: 26px 0 0; padding: 0; list-style: none; font-size: 12px; color: rgba(255,255,255,.48); }
.hero-notes span { color: var(--orange-soft); }
.hero-visual { position: relative; padding: 50px 10px; }
.preview-glow { position: absolute; inset: 8% 5%; background: radial-gradient(circle, rgba(94,151,255,.25), transparent 66%); filter: blur(20px); }
.phone-frame { position: relative; z-index: 2; width: min(100%, 620px); margin-left: auto; padding: 12px; border: 1px solid rgba(255,255,255,.14); border-radius: 36px; background: linear-gradient(145deg, rgba(255,255,255,.14), rgba(255,255,255,.025)); box-shadow: 0 38px 90px rgba(0,0,0,.48); transform: perspective(1200px) rotateY(-4deg) rotateX(2deg); }
.phone-frame img { width: 100%; border-radius: 25px; }
.phone-top { position: absolute; z-index: 3; top: 22px; left: 50%; width: 64px; height: 17px; border-radius: 99px; background: #030712; transform: translateX(-50%); }
.phone-top span { position: absolute; right: 8px; top: 5px; width: 6px; height: 6px; border-radius: 50%; background: #101c35; }
.floating-card { position: absolute; z-index: 4; display: flex; align-items: center; gap: 10px; padding: 12px 16px; border: 1px solid rgba(255,255,255,.15); border-radius: 16px; color: rgba(255,255,255,.78); background: rgba(14,26,51,.78); box-shadow: 0 18px 40px rgba(0,0,0,.28); backdrop-filter: blur(14px); font-size: 12px; }
.floating-card strong { display: block; color: white; font-size: 18px; line-height: 1; }
.card-weather { top: 18px; right: -12px; }
.sun-icon { color: var(--orange); font-size: 30px; line-height: 1; }
.card-calendar { bottom: 18px; left: -18px; }
.mini-date { display: grid; place-items: center; width: 37px; height: 40px; color: white; border-radius: 9px; background: #3867e8; font-size: 18px; font-weight: 800; }
.floating-card small { color: rgba(255,255,255,.5); }
.weather-orb { position: absolute; border-radius: 50%; filter: blur(2px); opacity: .6; }
.orb-one { width: 320px; height: 320px; top: -160px; right: 10%; background: rgba(62,97,177,.2); }
.orb-two { width: 180px; height: 180px; bottom: 60px; left: -90px; background: rgba(255,159,67,.08); }
.stars { position: absolute; inset: 0; opacity: .55; background-image: radial-gradient(circle, #fff 0 1px, transparent 1.4px), radial-gradient(circle, #8cb7ff 0 1px, transparent 1.4px); background-position: 0 0, 45px 70px; background-size: 130px 150px, 190px 210px; mask-image: linear-gradient(to bottom, black, transparent 90%); }

.section { padding: 112px 0; }
.section-kicker { margin: 0 0 14px; color: #d77a26; font-size: 13px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.section h2 { margin: 0; font-size: clamp(38px, 5vw, 62px); line-height: 1.13; letter-spacing: -.045em; }
.intro { padding-top: 130px; }
.intro .narrow > p:last-child { max-width: 680px; margin: 30px auto 0; color: var(--muted); font-size: 17px; }
.features { background: var(--cream); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 50px; margin-bottom: 48px; }
.section-heading > p { max-width: 400px; margin: 0 0 8px; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.feature-card { position: relative; min-height: 310px; padding: 34px; overflow: hidden; border: 1px solid rgba(15,27,54,.08); border-radius: var(--radius-md); background: rgba(255,255,255,.72); box-shadow: 0 10px 34px rgba(30,38,59,.04); }
.feature-card h3 { margin: 28px 0 10px; font-size: 24px; letter-spacing: -.02em; }
.feature-card p { max-width: 500px; margin: 0; color: var(--muted); }
.feature-wide { display: grid; grid-template-columns: .65fr 1fr; align-items: center; gap: 28px; }
.feature-wide h3 { margin-top: 0; }
.feature-number { position: absolute; top: 24px; right: 26px; color: #a3aabc; font: 700 12px/1 monospace; }
.feature-icon { width: 128px; height: 128px; display: grid; place-items: center; margin-inline: auto; border-radius: 36px; transform: rotate(-4deg); }
.feature-icon svg { width: 65px; fill: none; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.icon-sky { color: #ffd16f; background: linear-gradient(145deg, #13284c, #071126); box-shadow: 0 20px 40px rgba(7,17,38,.2); }
.icon-calendar { color: #5277db; background: #e3eaff; }
.icon-list { color: #25836e; background: #dff3eb; }
.theme-card { background: #111b31; color: white; }
.theme-card p { color: rgba(255,255,255,.58); }
.theme-demo { width: 170px; height: 130px; position: relative; margin-inline: auto; }
.theme-demo span { position: absolute; width: 68px; height: 86px; left: 50%; top: 50%; border: 3px solid #111b31; border-radius: 18px; background: var(--swatch); transform-origin: bottom center; }
.theme-demo span:nth-child(1) { transform: translate(-110%,-52%) rotate(-24deg); }
.theme-demo span:nth-child(2) { transform: translate(-68%,-60%) rotate(-8deg); }
.theme-demo span:nth-child(3) { transform: translate(-26%,-58%) rotate(9deg); }
.theme-demo span:nth-child(4) { transform: translate(15%,-48%) rotate(25deg); }

.scenes { background: #fbfaf7; }
.scenes-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; padding: 70px; color: white; border-radius: var(--radius-lg); background: linear-gradient(135deg, #071126, #10274a); box-shadow: var(--shadow); }
.scenes-copy h2 { font-size: clamp(36px, 4vw, 54px); }
.timeline { position: relative; margin: 0; padding: 0; list-style: none; }
.timeline::before { content: ""; position: absolute; left: 65px; top: 18px; bottom: 25px; width: 1px; background: rgba(255,255,255,.15); }
.timeline li { position: relative; display: grid; grid-template-columns: 64px 1fr; gap: 27px; padding-bottom: 34px; }
.timeline li::before { content: ""; position: absolute; left: 61px; top: 8px; width: 9px; height: 9px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 6px rgba(255,159,67,.12); }
.timeline time { color: var(--orange-soft); font-size: 13px; font-weight: 700; }
.timeline strong { font-size: 18px; }
.timeline p { margin: 4px 0 0; color: rgba(255,255,255,.54); font-size: 14px; }

.privacy { padding-top: 70px; }
.privacy-grid { display: grid; grid-template-columns: 250px 1fr; align-items: center; gap: 80px; max-width: 950px; }
.privacy-symbol { width: 210px; height: 210px; display: grid; place-items: center; border-radius: 50%; color: #3b8b77; background: #e4f1eb; }
.privacy-symbol svg { width: 105px; fill: none; stroke: currentColor; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.privacy h2 { font-size: clamp(36px, 4vw, 52px); }
.privacy p:last-child { color: var(--muted); max-width: 630px; margin-top: 22px; }

.final-cta { padding-top: 60px; }
.cta-panel { position: relative; overflow: hidden; padding: 86px 30px; text-align: center; color: white; border-radius: var(--radius-lg); background: linear-gradient(145deg, #0d1c38, #071126); }
.cta-panel::before { content: ""; position: absolute; width: 500px; height: 500px; left: -200px; bottom: -350px; border-radius: 50%; background: rgba(66,99,160,.22); }
.cta-panel h2 { position: relative; font-size: clamp(40px, 5vw, 62px); }
.cta-panel > p:not(.section-kicker) { position: relative; margin: 18px 0 30px; color: rgba(255,255,255,.6); }
.button-light { position: relative; color: #172039; background: white; }
.button-light:hover { box-shadow: 0 15px 40px rgba(0,0,0,.25); }
.cta-moon { position: absolute; right: 8%; top: 18%; width: 74px; height: 74px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 70px rgba(255,159,67,.25); }
.cta-moon::after { content: ""; position: absolute; width: 70px; height: 70px; top: -13px; left: -13px; border-radius: 50%; background: #0a1730; }

.site-footer { padding: 36px 0; color: rgba(255,255,255,.52); background: var(--navy-950); font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 25px; }
.footer-inner .brand { color: white; }
.footer-inner p { margin: 0; }
.toast { position: fixed; z-index: 100; left: 50%; bottom: 28px; padding: 12px 18px; color: white; border: 1px solid rgba(255,255,255,.12); border-radius: 12px; background: rgba(5,11,25,.94); box-shadow: 0 15px 45px rgba(0,0,0,.25); opacity: 0; pointer-events: none; transform: translate(-50%, 20px); transition: opacity .25s, transform .25s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.reveal { opacity: 1; transform: none; }
.motion-ready .reveal.visible { animation: reveal-in .7s ease both; }
@keyframes reveal-in {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 900px) {
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 20px; padding-top: 145px; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero h1 { font-size: clamp(58px, 15vw, 82px); }
  .hero-visual { width: min(100%, 680px); margin-inline: auto; }
  .phone-frame { margin-inline: auto; transform: none; }
  .section-heading { align-items: start; flex-direction: column; }
  .feature-wide { grid-template-columns: 1fr; text-align: center; }
  .feature-wide p { margin-inline: auto; }
  .scenes-panel { grid-template-columns: 1fr; gap: 50px; padding: 54px 40px; }
  .privacy-grid { grid-template-columns: 180px 1fr; gap: 45px; }
  .privacy-symbol { width: 170px; height: 170px; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .nav-wrap { height: 68px; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .menu-toggle[aria-expanded="true"] span:nth-of-type(2) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-of-type(3) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-of-type(4) { transform: translateY(-7px) rotate(-45deg); }
  .site-nav { position: absolute; left: 14px; right: 14px; top: 60px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px; border: 1px solid rgba(255,255,255,.1); border-radius: 18px; color: white; background: rgba(5,11,25,.97); box-shadow: 0 20px 45px rgba(0,0,0,.35); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 14px; }
  .nav-cta { margin-top: 6px; text-align: center; }
  .hero-grid { padding-top: 118px; padding-bottom: 95px; }
  .hero-lead { font-size: 16px; }
  .hero-actions { width: 100%; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-notes { justify-content: center; gap: 10px 16px; }
  .hero-visual { padding: 34px 0; }
  .phone-frame { padding: 7px; border-radius: 24px; }
  .phone-frame img { border-radius: 18px; }
  .phone-top { top: 13px; transform: translateX(-50%) scale(.75); }
  .floating-card { transform: scale(.84); }
  .card-weather { right: -18px; top: 4px; transform-origin: right top; }
  .card-calendar { left: -14px; bottom: 5px; transform-origin: left bottom; }
  .section { padding: 82px 0; }
  .intro { padding-top: 100px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 280px; padding: 28px; }
  .section-heading { margin-bottom: 34px; }
  .scenes-panel { padding: 40px 24px; border-radius: 24px; }
  .privacy { padding-top: 30px; }
  .privacy-grid { grid-template-columns: 1fr; text-align: center; }
  .privacy-symbol { width: 150px; height: 150px; margin-inline: auto; }
  .privacy p:last-child { margin-inline: auto; }
  .cta-panel { padding: 70px 20px; border-radius: 24px; }
  .cta-moon { opacity: .55; right: -10px; top: 15px; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (prefers-color-scheme: dark) {
  body { color: #e8edf7; background: #081126; }
  .hero::after { background: #081126; }
  .intro, .scenes { background: #081126; }
  .features { background: #0c1730; }
  .feature-card { color: #e8edf7; border-color: rgba(255,255,255,.08); background: rgba(255,255,255,.05); }
  .feature-card p, .section-heading > p, .intro .narrow > p:last-child, .privacy p:last-child { color: #9faac0; }
  .theme-card { background: #142443; }
  .privacy-symbol { background: #12342f; }
}