:root {
  --ink: #11221c;
  --muted: #5f7168;
  --green: #118565;
  --green-deep: #0b6b51;
  --mint: #e5f7ef;
  --line: #dcebe3;
  --surface: #ffffff;
  --canvas: #f7fbf8;
  --shadow: 0 22px 60px rgb(22 76 56 / 12%);
  --stagger-dur: 500ms;
  --stagger-distance: 12px;
  --stagger-stagger: 40ms;
  --stagger-blur: 3px;
  --stagger-ease: cubic-bezier(0.22, 1, 0.36, 1);
  font: 100%/1.6 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--canvas);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--canvas); }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 3px solid #75cdb1; outline-offset: 4px; }
img { display: block; max-width: 100%; }

.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgb(247 251 248 / 82%); backdrop-filter: blur(18px) saturate(150%); border-bottom: 1px solid rgb(220 235 227 / 72%); }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; letter-spacing: -0.02em; font-size: 1.08rem; }
.brand-mark { width: 31px; height: 31px; display: grid; place-items: center; border-radius: 10px; background: var(--green); color: white; box-shadow: 0 8px 18px rgb(17 133 101 / 24%); }
.brand-mark svg { width: 19px; height: 19px; }
.nav-links { display: flex; align-items: center; gap: 24px; color: #456057; font-size: .94rem; }
.nav-links a:hover { color: var(--green-deep); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; border-radius: 999px; padding: 0 21px; font-weight: 700; background: var(--green); color: white; box-shadow: 0 10px 24px rgb(17 133 101 / 22%); transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease; }
.nav-cta { min-height: 38px; padding-inline: 16px; font-size: .9rem; }
.button:hover, .nav-cta:hover { transform: translateY(-2px); background: var(--green-deep); box-shadow: 0 14px 28px rgb(17 107 81 / 24%); }
.button:active, .nav-cta:active { transform: scale(.97); transition-duration: 100ms; }
.mobile-nav { display: none; }

.hero { position: relative; overflow: clip; padding: clamp(76px, 12vw, 148px) 0 clamp(72px, 10vw, 120px); }
.hero::before { content: ""; position: absolute; width: min(82vw, 780px); aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle, rgb(177 235 210 / 65%), rgb(229 247 239 / 8%) 65%, transparent 72%); top: -34%; right: -22%; pointer-events: none; }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: clamp(42px, 8vw, 96px); }
.eyebrow { display: inline-flex; gap: 8px; align-items: center; border: 1px solid #c8e6d8; background: rgb(255 255 255 / 72%); color: var(--green-deep); border-radius: 999px; padding: 7px 12px; font-size: .84rem; font-weight: 700; }
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #41b98f; box-shadow: 0 0 0 4px rgb(65 185 143 / 14%); }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 680px; margin: 20px 0; font-size: clamp(2.65rem, 5vw, 4.8rem); letter-spacing: -0.055em; line-height: 1.08; font-weight: 760; }
.hero-copy { max-width: 610px; color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.14rem); line-height: 1.85; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 28px; }
.testing-note { color: var(--muted); font-size: .92rem; }
.t-stagger-line { display: block; opacity: 0; transform: translateY(var(--stagger-distance)); filter: blur(var(--stagger-blur)); transition: opacity var(--stagger-dur) var(--stagger-ease), transform var(--stagger-dur) var(--stagger-ease), filter var(--stagger-dur) var(--stagger-ease); will-change: transform, opacity, filter; }
.t-stagger-line--2 { transition-delay: var(--stagger-stagger); }
.t-stagger.is-shown .t-stagger-line { opacity: 1; transform: translateY(0); filter: blur(0); }
.hero-art { position: relative; min-height: 475px; display: grid; place-items: center; }
.hero-orbit { position: absolute; inset: 8% 5%; border-radius: 38% 62% 58% 42% / 42% 48% 52% 58%; background: linear-gradient(135deg, #daf5e8, #f2fbf6); transform: rotate(-13deg); }
.hero-phone { position: relative; width: min(285px, 72vw); border-radius: 31px; padding: 9px; background: #13231d; box-shadow: 0 30px 58px rgb(17 67 49 / 23%); transform: rotate(5deg); }
.hero-phone img { border-radius: 24px; width: 100%; }
.hero-bubble { position: absolute; right: 0; bottom: 11%; padding: 13px 15px; border: 1px solid rgb(255 255 255 / 90%); border-radius: 16px; background: rgb(255 255 255 / 88%); box-shadow: var(--shadow); color: #3d5c50; font-size: .85rem; font-weight: 650; }
.hero-bubble strong { display: block; color: var(--green-deep); font-size: 1rem; }

.section { padding: clamp(76px, 10vw, 116px) 0; }
.section--white { background: var(--surface); }
.section-heading { max-width: 700px; margin-bottom: 40px; }
.section-kicker { margin-bottom: 10px; color: var(--green-deep); font-size: .88rem; font-weight: 750; letter-spacing: .08em; }
h2 { margin-bottom: 14px; font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.17; letter-spacing: -0.045em; }
.section-heading > p { color: var(--muted); font-size: 1.04rem; }
.capability-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.capability { min-height: 210px; padding: 24px 20px; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease; }
.capability:hover { transform: translateY(-4px); border-color: #a9dcca; box-shadow: 0 18px 34px rgb(29 83 62 / 10%); }
.icon-box { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px; background: var(--mint); color: var(--green-deep); }
.icon-box svg { width: 22px; height: 22px; }
.capability h3 { margin: 20px 0 8px; font-size: 1.05rem; letter-spacing: -0.02em; }
.capability p { margin: 0; color: var(--muted); font-size: .91rem; line-height: 1.65; }

.product-showcase { display: grid; grid-template-columns: .86fr 1.14fr; align-items: center; gap: clamp(40px, 7vw, 90px); }
.product-frame { position: relative; max-width: 365px; margin: 0 auto; padding: 10px; border-radius: 37px; background: #14241d; box-shadow: 0 32px 72px rgb(17 67 49 / 24%); }
.product-frame::after { content: "当前 Android 测试版 · 真实界面"; position: absolute; left: 50%; bottom: -19px; transform: translateX(-50%); width: max-content; border-radius: 999px; padding: 8px 13px; background: white; box-shadow: 0 12px 25px rgb(26 67 50 / 12%); color: var(--green-deep); font-size: .78rem; font-weight: 700; }
.product-frame img { border-radius: 29px; }
.product-copy { max-width: 560px; }
.product-copy p { color: var(--muted); font-size: 1.04rem; line-height: 1.85; }
.product-points { display: grid; gap: 12px; margin-top: 24px; }
.product-point { display: flex; gap: 12px; align-items: flex-start; color: #355247; }
.product-point::before { content: ""; width: 21px; height: 21px; flex: 0 0 auto; border-radius: 50%; margin-top: 3px; background: #dff4e9; box-shadow: inset 0 0 0 6px #77cdaa; }

.belief { overflow: hidden; background: #e8f7ef; }
.belief-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(34px, 8vw, 100px); align-items: end; }
.belief h2 { margin: 0; font-size: clamp(2.3rem, 5vw, 4.25rem); }
.belief p { margin: 0; color: #486458; font-size: 1.08rem; line-height: 1.9; }

.reassurance-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.reassurance { padding: 24px; border-radius: 20px; background: #f7fbf8; border: 1px solid var(--line); }
.reassurance h3 { margin-bottom: 7px; font-size: 1.02rem; }
.reassurance p { margin: 0; color: var(--muted); font-size: .92rem; line-height: 1.68; }

.site-footer { padding: 44px 0 36px; background: #10231c; color: #dce9e2; }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; align-items: flex-start; }
.footer-copy { margin: 10px 0 0; color: #9cb5a9; font-size: .9rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; color: #d8e6de; font-size: .92rem; }
.footer-links a:hover { color: white; }

.legal-hero { padding: clamp(64px, 10vw, 112px) 0 42px; background: linear-gradient(140deg, #edf9f3, #fbfdfb); }
.legal-hero h1 { margin-bottom: 14px; font-size: clamp(2.4rem, 5vw, 4.1rem); }
.legal-hero p { max-width: 700px; color: var(--muted); font-size: 1.04rem; }
.legal-layout { display: grid; grid-template-columns: minmax(0, 760px); padding-top: 24px; padding-bottom: 96px; }
.legal-card { padding: clamp(26px, 5vw, 54px); background: white; border: 1px solid var(--line); border-radius: 26px; box-shadow: 0 18px 50px rgb(27 83 61 / 8%); }
.legal-card h2 { margin: 44px 0 12px; font-size: 1.45rem; letter-spacing: -0.025em; }
.legal-card h2:first-child { margin-top: 0; }
.legal-card p, .legal-card li { color: #4e655b; }
.legal-card ul { padding-left: 1.25rem; }
.contact-card { display: grid; gap: 18px; padding: clamp(30px, 5vw, 54px); background: white; border: 1px solid var(--line); border-radius: 26px; box-shadow: 0 18px 50px rgb(27 83 61 / 8%); }
.contact-email { display: inline-flex; width: fit-content; max-width: 100%; overflow-wrap: anywhere; color: var(--green-deep); font-size: clamp(1.15rem, 3vw, 1.6rem); font-weight: 750; text-decoration: underline; text-underline-offset: 5px; }
.contact-tip { padding: 15px 17px; border-radius: 15px; background: var(--mint); color: #416355; font-size: .93rem; }
.not-found { min-height: 65vh; display: grid; place-items: center; text-align: center; }
.not-found h1 { margin: 12px auto; }

@media (max-width: 900px) {
  .capability-grid { grid-template-columns: repeat(3, 1fr); }
  .hero-grid, .product-showcase, .belief-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 680px; }
  .hero-art { min-height: 410px; order: -1; }
  .hero-phone { width: min(245px, 68vw); }
  .product-frame { max-width: 320px; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 32px, 1120px); }
  .nav { min-height: 64px; }
  .desktop-nav { display: none; }
  .mobile-nav { display: block; position: relative; }
  .mobile-nav summary { list-style: none; cursor: pointer; color: var(--green-deep); font-weight: 750; padding: 8px 10px; border-radius: 10px; }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav summary::before { content: "菜单"; }
  .mobile-nav[open] summary::before { content: "关闭"; }
  .mobile-links { position: absolute; right: 0; top: calc(100% + 10px); width: 190px; display: grid; gap: 4px; padding: 8px; background: white; border: 1px solid var(--line); border-radius: 15px; box-shadow: var(--shadow); }
  .mobile-links a { padding: 10px 12px; border-radius: 10px; color: #38564a; }
  .mobile-links a:hover { background: var(--mint); color: var(--green-deep); }
  .hero { padding-top: 64px; }
  h1 { font-size: clamp(2.35rem, 12vw, 3.6rem); }
  .hero-art { min-height: 340px; }
  .hero-bubble { bottom: 4%; right: -2px; font-size: .76rem; }
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
  .capability { min-height: 190px; padding: 19px 16px; }
  .capability:last-child { grid-column: span 2; }
  .reassurance-grid { grid-template-columns: 1fr; }
  .section { padding: 70px 0; }
  .footer-grid { flex-direction: column; }
}

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

@media (prefers-reduced-transparency: reduce) {
  .site-header { background: #f7fbf8; backdrop-filter: none; }
}

@media (prefers-contrast: more) {
  .capability, .reassurance, .legal-card, .contact-card { border-color: #647d70; }
}