/* 方案选择页（桌面端演示用） */
:root { --s: .8; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  min-height: 100vh; color: #e8ecf6;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(110, 92, 255, .25), transparent 60%),
              radial-gradient(900px 500px at 0% 10%, rgba(62, 230, 255, .1), transparent 60%), #05070d;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: -1;
  background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 48px 48px; mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 75%);
}
.top { max-width: 1560px; margin: 0 auto; padding: 36px 40px 10px; display: flex; gap: 32px; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; }
.eyebrow { font-size: 12px; letter-spacing: 3px; color: #8fa6d8; }
h1 { font-size: 34px; font-weight: 800; letter-spacing: 2px; margin-top: 8px; background: linear-gradient(90deg, #fff, #9fb6ff 60%, #3ee6ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 14px; color: #95a1bd; margin-top: 10px; max-width: 640px; line-height: 1.8; }
.ctrl { display: flex; flex-direction: column; gap: 10px; align-items: flex-end; }
.ctrl-label { font-size: 12px; color: #8a96b3; letter-spacing: 1px; }
.seg { display: flex; padding: 4px; border-radius: 14px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.08); }
.seg button { font: inherit; font-size: 13px; color: #aeb8d2; background: none; border: 0; height: 34px; padding: 0 16px; border-radius: 10px; cursor: pointer; }
.seg button.on { background: linear-gradient(135deg, #3d7bff, #8b5cff); color: #fff; font-weight: 600; box-shadow: 0 8px 20px -8px rgba(110, 92, 255, .9); }
.links { display: flex; gap: 8px; flex-wrap: wrap; font-size: 13px; }
.links a { color: #cdd6ee; text-decoration: none; height: 32px; padding: 0 14px; border-radius: 16px; display: inline-flex; align-items: center; background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12); }
.links a::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #6b8cff; margin-right: 8px; }
.links a:hover { color: #fff; background: rgba(110,120,255,.18); border-color: rgba(140,150,255,.4); }

.stage { max-width: 1560px; margin: 0 auto; padding: 24px 40px 30px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
@media (max-width: 1279px) { .stage { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 859px) { .stage { grid-template-columns: 1fr; } .top { padding: 24px 20px 0; } .stage { padding: 20px; } .ctrl { align-items: flex-start; } }
.opt { display: flex; flex-direction: column; align-items: center; gap: 18px; padding: 24px 18px 20px; border-radius: 28px; background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.015)); border: 1px solid rgba(255,255,255,.07); }
.phone-wrap { width: calc(414px * var(--s)); height: calc(868px * var(--s)); }
.phone { width: 414px; height: 868px; transform: scale(var(--s)); transform-origin: top left; position: relative; padding: 12px; border-radius: 60px; background: linear-gradient(145deg, #2a2f3a, #0d0f14); box-shadow: 0 0 0 1.5px #3b4150, 0 40px 80px -30px rgba(0, 0, 0, .9), inset 0 0 0 2px #000; }
.phone iframe { width: 390px; height: 844px; border: 0; border-radius: 48px; display: block; background: #000; }
.island { position: absolute; top: 23px; left: 50%; transform: translateX(-50%); width: 120px; height: 34px; border-radius: 20px; background: #000; z-index: 2; pointer-events: none; }
.meta { display: flex; gap: 14px; width: 100%; max-width: 420px; }
.code { width: 42px; height: 42px; flex: none; border-radius: 14px; display: grid; place-items: center; font-weight: 800; font-size: 18px; color: #fff; background: linear-gradient(135deg, #3d7bff, #8b5cff); }
.opt[data-theme="crimson"] .code { background: linear-gradient(135deg, #9a0e26, #d4233c); }
.opt[data-theme="titanium"] .code { background: linear-gradient(135deg, #0f2550, #2b4f8f); color: #e9cf9c; }
.grow { flex: 1; min-width: 0; }
.meta h2 { font-size: 19px; font-weight: 700; letter-spacing: 1px; }
.meta h2 small { font-size: 11px; font-weight: 500; color: #7f8aa6; letter-spacing: 1.5px; margin-left: 6px; }
.meta p { font-size: 13px; line-height: 1.75; color: #9aa5bf; margin-top: 6px; }
.sw { display: flex; gap: 6px; margin-top: 10px; }
.sw i { width: 22px; height: 22px; border-radius: 7px; box-shadow: inset 0 0 0 1px rgba(255,255,255,.15); }
.open { font-size: 13px; color: #cfd8ee; text-decoration: none; height: 38px; padding: 0 22px; border-radius: 19px; display: inline-flex; align-items: center; border: 1px solid rgba(255,255,255,.16); }
.open:hover { background: rgba(255,255,255,.08); }
.foot { text-align: center; font-size: 12px; color: #6b7590; padding: 10px 20px 40px; }