:root {
  --bg: #07080B;
  --bg2: #0D0F14;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-solid: #12141A;
  --line: rgba(255, 255, 255, 0.08);
  --line2: rgba(255, 255, 255, 0.14);
  --text: #F5F5F7;
  --text2: #A1A1A6;
  --muted: #6E6E73;
  --accent: #F0254A;
  --accent2: #FF6A57;
  --radius: 24px;
  --max: 1200px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 Inter, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }
button { font: inherit; color: inherit; }

/* 导航 */
.nav {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%); z-index: 20;
  display: flex; align-items: center; gap: 24px;
  width: min(var(--max), calc(100% - 32px)); height: 58px; padding: 0 10px 0 18px;
  background: rgba(14, 15, 20, 0.55); border: 1px solid var(--line);
  backdrop-filter: blur(22px) saturate(1.6); -webkit-backdrop-filter: blur(22px) saturate(1.6);
  border-radius: 20px; transition: background .3s, border-color .3s;
}
.nav.scrolled { background: rgba(14, 15, 20, 0.8); border-color: var(--line2); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.brand img { border-radius: 8px; }
.links { display: flex; gap: 2px; margin-left: auto; }
.links a { padding: 7px 12px; border-radius: 10px; color: var(--text2); font-size: 14px; font-weight: 500; transition: color .2s, background .2s; }
.links a:hover { color: var(--text); background: var(--panel); }
.nav-cta { padding: 8px 16px; border-radius: 12px; font-size: 14px; font-weight: 600; background: var(--text); color: #0B0B0F; }

main section { position: relative; }
.head { max-width: 760px; margin: 0 auto 48px; text-align: center; padding: 0 20px; }
.kicker { margin: 0 0 12px; font-size: 13px; font-weight: 600; letter-spacing: .14em; color: var(--accent2); text-transform: uppercase; }
h1, h2, h3 { margin: 0; letter-spacing: -0.03em; }
h2 { font-size: clamp(32px, 4.6vw, 54px); line-height: 1.12; font-weight: 800; }
.head p:not(.kicker), .copy > p { color: var(--text2); font-size: 18px; margin: 16px 0 0; }

/* 首屏 */
.hero { padding: 150px 20px 40px; text-align: center; overflow: hidden; }
.aurora { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.aurora i { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .55; }
.aurora i:nth-child(1) { width: 720px; height: 520px; left: 50%; top: -220px; margin-left: -700px; background: radial-gradient(closest-side, #2f6fff, transparent); animation: float 16s ease-in-out infinite alternate; }
.aurora i:nth-child(2) { width: 680px; height: 520px; left: 50%; top: -160px; margin-left: 40px; background: radial-gradient(closest-side, #ff4d6a, transparent); animation: float 18s ease-in-out infinite alternate-reverse; }
.aurora i:nth-child(3) { width: 900px; height: 600px; left: 50%; top: 420px; margin-left: -450px; background: radial-gradient(closest-side, rgba(40, 190, 160, .7), transparent); opacity: .3; }
@keyframes float { to { transform: translate(60px, 40px) scale(1.08); } }
.hero-copy { position: relative; max-width: 880px; margin: 0 auto; }
.pill {
  display: inline-flex; align-items: center; gap: 10px; padding: 5px 14px 5px 6px; margin-bottom: 26px;
  border-radius: 999px; border: 1px solid var(--line2); background: var(--panel); font-size: 13px; color: var(--text2);
  transition: border-color .2s;
}
.pill:hover { border-color: rgba(255, 255, 255, .3); }
.pill b { padding: 2px 10px; border-radius: 999px; background: linear-gradient(90deg, var(--accent), var(--accent2)); color: #fff; font-weight: 600; }
h1 { font-size: clamp(42px, 7.2vw, 88px); line-height: 1.04; font-weight: 800; }
.grad { background: linear-gradient(100deg, #fff 10%, #ffb3a6 45%, #ff4d6a 75%, #c7a6ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 640px; margin: 26px auto 34px; color: var(--text2); font-size: clamp(16px, 1.6vw, 19px); }
.cta { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; gap: 9px; height: 52px; padding: 0 26px; border-radius: 16px; font-weight: 600; font-size: 16px; transition: transform .15s, box-shadow .25s, background .25s; }
.btn:active { transform: scale(.97); }
.btn.primary { background: linear-gradient(180deg, #ff4d6a, #dc1031); color: #fff; box-shadow: 0 12px 34px rgba(240, 37, 74, .35), inset 0 1px 0 rgba(255, 255, 255, .25); }
.btn.primary:hover { box-shadow: 0 16px 44px rgba(240, 37, 74, .5), inset 0 1px 0 rgba(255, 255, 255, .25); }
.btn.ghost { border: 1px solid var(--line2); background: var(--panel); }
.btn.ghost:hover { background: rgba(255, 255, 255, .08); }
.meta { color: var(--muted); font-size: 14px; margin: 16px 0 0; }

/* 截图容器 */
.stage { position: relative; max-width: 1120px; margin: 72px auto 0; padding-right: 120px; }
.window {
  margin: 0; border-radius: 14px; overflow: hidden; background: #000;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .1), 0 40px 120px rgba(0, 0, 0, .6), 0 20px 60px rgba(47, 111, 255, .12);
}
.stage .window { transform: perspective(2400px) rotateX(6deg); transform-origin: 50% 100%; }
.phone {
  position: relative; margin: 0; width: 280px; padding: 9px; border-radius: 46px;
  background: linear-gradient(150deg, #3a3b40, #121317 40%, #1f2024);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .12) inset, 0 30px 80px rgba(0, 0, 0, .55);
}
.phone img { border-radius: 38px; width: 100%; }
.phone::after { /* 前置摄像头 */
  content: ""; position: absolute; top: 20px; left: 50%; width: 11px; height: 11px; margin-left: -5.5px;
  border-radius: 50%; background: #0a0a0c; box-shadow: 0 0 0 2px rgba(255, 255, 255, .05);
}
.phone-hero { position: absolute; right: 0; bottom: -40px; width: 250px; }

.strip {
  display: grid; grid-template-columns: repeat(4, 1fr); max-width: 980px; margin: 110px auto 0; padding: 0 20px;
}
.strip div { text-align: center; padding: 8px 0; border-left: 1px solid var(--line); }
.strip div:first-child { border-left: 0; }
.strip b { display: block; font-size: clamp(30px, 4vw, 44px); font-weight: 800; letter-spacing: -0.03em; }
.strip span { color: var(--text2); font-size: 14px; }

/* 播放体验 */
.showcase {
  display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center;
  max-width: var(--max); margin: 160px auto 0; padding: 0 20px;
}
.ticks { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 14px; }
.ticks li { position: relative; padding-left: 30px; color: var(--text2); }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: 5px; width: 18px; height: 18px; border-radius: 6px;
  background: rgba(255, 77, 106, .14) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ff6a7f' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / 12px no-repeat;
}
.phones { display: flex; justify-content: center; gap: 28px; }
.phones .phone { width: min(280px, 44%); }
.tilt-l { transform: translateY(-24px) rotate(-3deg); }
.tilt-r { transform: translateY(24px) rotate(3deg); }

/* 桌面端 */
.desktop { max-width: var(--max); margin: 170px auto 0; padding: 0 20px; }
.tabs {
  display: flex; align-items: center; gap: 4px; width: max-content; max-width: 100%; margin: 0 auto 28px; padding: 5px;
  border-radius: 16px; background: var(--panel); border: 1px solid var(--line); overflow-x: auto;
}
.tabs button { border: 0; background: none; padding: 9px 16px; border-radius: 11px; font-size: 14px; font-weight: 600; color: var(--text2); cursor: pointer; white-space: nowrap; transition: background .2s, color .2s; }
.tabs button[aria-selected="true"], .tabs button[aria-pressed="true"] { background: rgba(255, 255, 255, .1); color: var(--text); }
.tabs .sep { width: 1px; height: 20px; background: var(--line2); margin: 0 4px; }
.tabs .mode { display: inline-flex; align-items: center; gap: 6px; }
.tabs .mode svg { width: 16px; height: 16px; }
.window.big img { transition: opacity .25s; }
.window.big img.fade { opacity: 0; }

/* 手机画廊 */
.gallery { margin: 170px auto 0; }
.rail { display: flex; justify-content: center; gap: 28px; padding: 10px 20px 30px; overflow-x: auto; scroll-snap-type: x mandatory; }
.rail .phone { width: 250px; scroll-snap-align: center; }
.rail figcaption { position: absolute; left: 0; right: 0; bottom: -34px; text-align: center; font-size: 14px; color: var(--text2); }
.rail .phone { margin-bottom: 30px; }

/* 特性 */
.features { max-width: var(--max); margin: 150px auto 0; padding: 0 20px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid article { padding: 28px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); transition: border-color .25s, transform .25s; }
.grid article:hover { border-color: var(--line2); transform: translateY(-2px); }
.grid h3 { font-size: 19px; margin: 18px 0 8px; }
.grid p { margin: 0; color: var(--text2); font-size: 15px; }
/* 与应用一致的扁平图标块 */
.tile { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 13px; color: #fff; }
.tile svg { width: 22px; height: 22px; }
.tile.red { background: #EA2E4B; }
.tile.blue { background: #438DED; }
.tile.teal { background: #25A995; }
.tile.orange { background: #E88022; }
.tile.graphite { background: #79797D; }

/* 下载 */
.download { max-width: var(--max); margin: 160px auto 0; padding: 0 20px; }
.platforms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; align-items: start; }
.platforms article { padding: 22px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.platforms article.current { border-color: rgba(255, 77, 106, .55); box-shadow: 0 0 0 1px rgba(255, 77, 106, .25), 0 20px 50px rgba(240, 37, 74, .12); }
.platforms header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.platforms header svg { width: 30px; height: 30px; padding: 6px; border-radius: 10px; background: rgba(255, 255, 255, .06); box-sizing: content-box; }
.platforms h3 { font-size: 18px; }
.platforms small { color: var(--muted); font-size: 13px; }
.platforms ul { list-style: none; margin: 0; padding: 0; }
.platforms li + li { border-top: 1px solid var(--line); }
.platforms li a { display: flex; flex-direction: column; padding: 11px 2px; font-weight: 600; font-size: 15px; transition: color .2s; }
.platforms li a em { font-style: normal; font-weight: 400; font-size: 13px; color: var(--text2); }
.platforms li a[href]:hover { color: #ff8a9b; }
.platforms li a:not([href]) { opacity: .4; }
.notes { max-width: 780px; margin: 28px auto 0; padding: 18px 24px; border-radius: 20px; background: var(--panel); border: 1px solid var(--line); }
.notes summary { cursor: pointer; font-weight: 600; }
.notes ul { padding-left: 20px; color: var(--text2); }
.notes p { color: var(--text2); }

/* 常见问题 */
.faq { max-width: 860px; margin: 150px auto 0; padding: 0 20px; }
.qa details { border-bottom: 1px solid var(--line); }
.qa summary { list-style: none; cursor: pointer; padding: 22px 36px 22px 0; font-size: 17px; font-weight: 600; position: relative; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; position: absolute; right: 4px; top: 18px; font-size: 24px; font-weight: 300; color: var(--text2); transition: transform .25s; }
.qa details[open] summary::after { transform: rotate(45deg); }
.qa p { margin: -6px 0 22px; color: var(--text2); }

footer { max-width: var(--max); margin: 140px auto 0; padding: 32px 20px 48px; border-top: 1px solid var(--line); }
.foot { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.foot nav { display: flex; gap: 22px; }
.foot nav a { color: var(--text2); font-size: 14px; }
.foot nav a:hover { color: var(--text); }
.legal { color: var(--muted); font-size: 13px; margin: 20px 0 0; max-width: 760px; }

/* 首屏加载动画 */
.rise { animation: rise 1s cubic-bezier(.2, .8, .2, 1) both; }
.rise.late { animation-delay: .15s; }
@keyframes rise { from { opacity: 0; transform: translateY(28px); } }

/* 进入视口时淡入 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .8, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

@media (max-width: 1000px) {
  .showcase { grid-template-columns: 1fr; }
  .platforms { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .rail { justify-content: flex-start; }
}
@media (max-width: 720px) {
  .links { display: none; }
  .nav-cta { margin-left: auto; }
  .hero { padding-top: 120px; }
  .stage { padding-right: 0; margin-top: 48px; }
  .stage .window { transform: none; }
  .phone-hero { position: relative; right: auto; bottom: auto; width: 62%; margin: -90px 0 0 auto; }
  .strip { grid-template-columns: repeat(2, 1fr); row-gap: 24px; margin-top: 80px; }
  .strip div:nth-child(3) { border-left: 0; }
  .showcase, .desktop, .gallery, .features, .download, .faq { margin-top: 110px; }
  .phones { gap: 14px; }
  .grid, .platforms { grid-template-columns: 1fr; }
  .rail .phone { width: 220px; flex: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}