:root {
  --ink: #111111;
  --mid: #6b6b6b;
  --faint: #a8a8a8;
  --line: #e6e6e6;
  --soft: #f5f5f5;
  --volt: #e3ff2d;
  --bg: #ffffff;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #f4f4f2;
    --mid: #a3a3a0;
    --faint: #6d6d6a;
    --line: #2a2a28;
    --soft: #1a1a19;
    --bg: #0e0e0e;
    --card: #161615;
  }
}
:root[data-theme="dark"] {
  --ink: #f4f4f2; --mid: #a3a3a0; --faint: #6d6d6a; --line: #2a2a28; --soft: #1a1a19; --bg: #0e0e0e; --card: #161615;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 顶栏 */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.brand b { font-weight: 900; font-size: 18px; transform: skewX(-8deg); display: inline-block; }
.brand span { font-family: "Archivo", sans-serif; font-style: italic; font-weight: 800; font-size: 13px; letter-spacing: .06em; color: var(--mid); }
.nav { display: flex; gap: 20px; font-size: 14px; }
.nav a { text-decoration: none; color: var(--mid); }
.nav a:hover, .nav a[aria-current] { color: var(--ink); }

/* 首屏 */
.hero { padding: 72px 0 40px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.eyebrow { font-size: 14px; font-weight: 600; color: var(--mid); letter-spacing: .02em; }
.display { font-weight: 900; font-size: clamp(48px, 9vw, 96px); line-height: 1.02; letter-spacing: -.02em; transform: skewX(-8deg); transform-origin: left bottom; margin: 14px 0 6px; }
.display-en { font-family: "Archivo", sans-serif; font-style: italic; font-weight: 900; font-stretch: 72%; font-size: clamp(28px, 5vw, 48px); letter-spacing: .01em; line-height: 1; }
.display-en mark { background: var(--volt); color: #111; padding: 0 .12em; }
.lede { font-size: 18px; color: var(--mid); margin: 22px 0 28px; max-width: 30em; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; height: 52px; padding: 0 26px; border-radius: 26px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1.5px solid var(--ink); }
.btn.solid { background: var(--ink); color: var(--bg); }
.btn.soon { cursor: default; }
.note { font-size: 13px; color: var(--faint); }

.phones { position: relative; height: 560px; }
.phone { position: absolute; width: 250px; border-radius: 34px; overflow: hidden; border: 6px solid #111; box-shadow: 0 30px 60px rgba(0,0,0,.18); background: #111; }
.phone img { width: 100%; }
.phone.a { left: 0; top: 30px; transform: rotate(-4deg); }
.phone.b { right: 0; top: 0; transform: rotate(4deg); }

/* 特性 */
section { padding: 64px 0; }
.h2 { font-weight: 900; font-size: clamp(30px, 5vw, 44px); line-height: 1.15; transform: skewX(-8deg); transform-origin: left; margin-bottom: 10px; }
.sub { color: var(--mid); font-size: 17px; max-width: 34em; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 36px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 24px; }
.card .num { font-family: "Archivo", sans-serif; font-style: italic; font-weight: 900; font-stretch: 72%; font-size: 40px; line-height: 1; }
.card h3 { font-size: 18px; margin: 14px 0 6px; }
.card p { color: var(--mid); font-size: 15px; }
.card.volt { background: var(--volt); border-color: var(--volt); color: #111; }
.card.volt p { color: rgba(17,17,17,.7); }

.band { background: #0e0e0e; color: #f4f4f2; border: 1px solid var(--line); border-radius: 28px; padding: 48px 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.band .sub { color: #a3a3a0; }
.band ul { list-style: none; margin-top: 22px; display: grid; gap: 12px; }
.band li { display: flex; gap: 12px; font-size: 16px; }
.band li::before { content: ""; flex: none; width: 10px; height: 10px; margin-top: 8px; border-radius: 50%; background: var(--volt); }
.band .shots { display: flex; gap: 14px; justify-content: center; }
.band .shots .phone { position: static; width: 46%; transform: none; border-color: #2a2a28; }

.steps { counter-reset: s; display: grid; gap: 0; margin-top: 28px; border-top: 1px solid var(--line); }
.steps li { list-style: none; display: grid; grid-template-columns: 56px 1fr; gap: 12px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.steps li::before { counter-increment: s; content: counter(s); font-family: "Archivo", sans-serif; font-style: italic; font-weight: 900; font-size: 34px; line-height: 1; }
.steps b { display: block; font-size: 17px; }
.steps span { color: var(--mid); font-size: 15px; }

/* 文档页 */
.doc { max-width: 760px; margin: 0 auto; padding: 48px 20px 80px; }
.doc h1 { font-weight: 900; font-size: clamp(32px, 6vw, 44px); transform: skewX(-8deg); transform-origin: left; line-height: 1.15; }
.doc .meta { color: var(--mid); font-size: 14px; margin: 10px 0 30px; }
.doc h2 { font-size: 20px; margin: 34px 0 10px; }
.doc h3 { font-size: 16px; margin: 20px 0 6px; }
.doc p, .doc li { font-size: 16px; color: var(--ink); }
.doc p { margin: 8px 0; }
.doc ul, .doc ol { padding-left: 1.3em; margin: 8px 0; }
.doc li { margin: 4px 0; }
.doc .muted { color: var(--mid); }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; display: block; overflow-x: auto; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.doc th { background: var(--soft); font-weight: 600; white-space: nowrap; }
.callout { background: var(--soft); border-radius: 14px; padding: 16px 18px; margin: 16px 0; }
.faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--mid); }
.faq details[open] summary::after { content: "–"; }
.faq p { color: var(--mid); margin-top: 8px; }

/* 页脚 */
footer { border-top: 1px solid var(--line); padding: 32px 0 48px; margin-top: 40px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 28px; justify-content: space-between; font-size: 14px; color: var(--mid); }
footer nav { display: flex; flex-wrap: wrap; gap: 20px; }
footer a { text-decoration: none; }
footer a:hover { color: var(--ink); }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .phones { height: 440px; max-width: 420px; }
  .phone { width: 200px; }
  .grid { grid-template-columns: 1fr; }
  .band { grid-template-columns: 1fr; padding: 32px 22px; }
  .nav { gap: 14px; font-size: 13px; }
  .nav .hide-sm { display: none; }
}
@media (max-width: 380px) {
  .phones { height: 380px; }
  .phone { width: 168px; }
}