/* 下载页：沿用桌面客户端宣传页的风格（深色点阵、绿色光迹、发光节点、卡片、环形光按钮） */
:root {
  --bg: #0d1117; --ink: #e6edf3; --muted: #8b98a6; --dim: #5d6a77;
  --g: #3fb950; --g-hi: #7ee787; --g-lo: #1a4d2a; --card: rgba(22, 27, 34, .78); --line: rgba(63, 185, 80, .22);
  --mono: "Cascadia Mono", "Cascadia Code", Consolas, "Microsoft YaHei UI", monospace;
  --disp: Bahnschrift, "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  --body: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  --ease: cubic-bezier(.65, 0, .2, 1);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body { margin: 0; min-height: 100vh; color: var(--ink); font: 400 15px/1.6 var(--body); background: var(--bg); overflow-x: hidden; }
a { color: var(--g-hi); }
[hidden] { display: none !important; }

.grid { position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image: radial-gradient(rgba(126, 231, 135, .16) 1px, transparent 1.2px); background-size: 22px 22px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 85%); }
.vignette { position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(ellipse 60% 40% at 50% 18%, rgba(63, 185, 80, .12), transparent 70%),
              radial-gradient(ellipse 90% 80% at 50% 40%, transparent 45%, rgba(5, 8, 12, .7) 100%); }

.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; display: flex; align-items: center; justify-content: space-between;
  max-width: 1080px; margin: 0 auto; padding: 18px 24px; }
.brand { display: flex; align-items: center; gap: 10px; font: 600 16px/1 var(--disp); letter-spacing: .04em; }
.logo-sm { width: 28px; height: 28px; border-radius: 7px; object-fit: cover; box-shadow: 0 0 0 1px var(--line); }
.site-link { font-size: 13px; color: var(--muted); text-decoration: none; padding: 7px 14px; border-radius: 16px; border: 1px solid rgba(139, 152, 166, .25); transition: color .2s, border-color .2s; }
.site-link:hover { color: var(--g-hi); border-color: var(--line); }
.site-link i { font-style: normal; }

main { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
/* 两侧光迹是装饰，超出部分裁掉，窄屏不出横向滚动条 */
.hero { text-align: center; padding: 48px 0 24px; overflow: hidden; }
.node { position: relative; width: 112px; height: 112px; margin: 0 auto 30px; }
.chip { position: absolute; inset: 14px; border-radius: 20px; display: grid; place-items: center; overflow: hidden;
  background: linear-gradient(160deg, #18212b, #0f151c); box-shadow: 0 0 0 1px rgba(126, 231, 135, .45), 0 0 34px rgba(63, 185, 80, .35);
  animation: rise .8s var(--ease) both; }
.chip img { width: 100%; height: 100%; object-fit: cover; }
.chip svg { width: 44px; height: 44px; fill: none; stroke: var(--g-hi); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.halo { position: absolute; inset: -16px; border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(63, 185, 80, .34), rgba(63, 185, 80, 0) 70%); animation: halo 4s ease-in-out infinite; }
.trace { position: absolute; background: linear-gradient(90deg, rgba(63, 185, 80, 0), var(--g)); opacity: .55; }
.trace::after { content: ''; position: absolute; width: 6px; height: 6px; border-radius: 50%; background: var(--g-hi); box-shadow: 0 0 10px var(--g-hi); }
.t1, .t2 { top: 50%; height: 1px; width: min(34vw, 340px); }
.t1 { right: 100%; } .t1::after { top: -2.5px; left: 0; animation: runL 3.2s 1s var(--ease) infinite; }
.t2 { left: 100%; transform: scaleX(-1); } .t2::after { top: -2.5px; left: 0; animation: runL 3.2s 1.6s var(--ease) infinite; }
.t3, .t4 { left: 50%; width: 1px; height: 46px; background: linear-gradient(180deg, rgba(63, 185, 80, 0), var(--g)); }
.t3 { bottom: 100%; } .t4 { top: 100%; transform: scaleY(-1); }
.t3::after, .t4::after { display: none; }

.kicker { display: inline-flex; align-items: center; gap: 12px; margin: 0 0 14px; font: 500 13px/1 var(--mono); color: var(--g-hi); letter-spacing: .12em;
  animation: rise .7s .15s var(--ease) both; }
.kicker::before, .kicker::after { content: ''; width: 36px; height: 1px; background: linear-gradient(90deg, transparent, var(--g)); }
.kicker::after { transform: scaleX(-1); }
h1 { margin: 0; font: 700 clamp(28px, 5vw, 46px)/1.25 var(--disp); letter-spacing: .04em;
  background: linear-gradient(180deg, #fff, #c8f5cf 60%, var(--g-hi)); -webkit-background-clip: text; background-clip: text; color: transparent;
  text-wrap: balance; animation: rise .8s .25s var(--ease) both; }
.sub { max-width: 640px; margin: 16px auto 0; color: var(--muted); font-size: 15px; animation: rise .8s .35s var(--ease) both; }

.cta-row { margin-top: 34px; animation: rise .8s .45s var(--ease) both; }
@property --a { syntax: '<angle>'; inherits: false; initial-value: 0deg; }
.cta { position: relative; display: inline-flex; align-items: center; height: 56px; padding: 0 40px; border-radius: 28px; isolation: isolate;
  font: 700 17px/1 var(--body); letter-spacing: .06em; color: #0b2412; text-decoration: none;
  box-shadow: 0 0 0 1px rgba(126, 231, 135, .5), 0 10px 36px rgba(63, 185, 80, .4); transition: box-shadow .25s, transform .25s; }
.cta::before { content: ''; position: absolute; inset: -3px; border-radius: 31px; z-index: -1;
  background: conic-gradient(from var(--a), transparent 0 70%, rgba(200, 255, 205, .95) 82%, transparent 92%); animation: orbit 3.2s linear infinite; }
.cta::after { content: ''; position: absolute; inset: 0; border-radius: 28px; z-index: -1; background: linear-gradient(180deg, var(--g-hi), var(--g)); }
.cta i { font-style: normal; margin-left: 12px; transition: transform .3s ease; }
.cta:hover { box-shadow: 0 0 0 1px rgba(200, 255, 205, .8), 0 12px 44px rgba(63, 185, 80, .65); transform: translateY(-1px); }
.cta:hover i { transform: translateY(3px); }
.cta:focus-visible { outline: 2px solid rgba(126, 231, 135, .85); outline-offset: 6px; }
.cta.is-wait, .cta.is-off { pointer-events: none; filter: saturate(.35) brightness(.8); }
.cta.is-wait::before, .cta.is-off::before { animation: none; opacity: 0; }
.meta { margin: 14px 0 0; font: 400 12.5px/1.6 var(--mono); color: var(--dim); letter-spacing: .04em; }
.meta.warn { color: #e3b341; }
.meta.mobile { color: var(--g-hi); }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 56px 0 0; }
.card { position: relative; min-height: 112px; padding: 16px 18px 16px 64px; border-radius: 12px; overflow: hidden;
  background: var(--card); border: 1px solid rgba(63, 185, 80, .14); transition: border-color .3s, background .3s, transform .3s;
  animation: rise .7s var(--ease) both; animation-delay: calc(.55s + var(--i, 0) * .08s); }
.card:hover { border-color: rgba(126, 231, 135, .6); background: rgba(26, 36, 30, .86); transform: translateY(-2px); }
.card::after { content: ''; position: absolute; inset: 0; pointer-events: none; transform: translateX(-110%);
  background: linear-gradient(105deg, transparent 30%, rgba(126, 231, 135, .2) 48%, transparent 66%);
  animation: sweep 1s ease-out both; animation-delay: calc(.8s + var(--i, 0) * .08s); }
.card .idx { position: absolute; right: 14px; top: 12px; font: 500 10.5px/1 var(--mono); color: var(--dim); letter-spacing: .1em; }
.card svg { position: absolute; left: 18px; top: 18px; width: 30px; height: 30px; overflow: visible; }
.card svg * { fill: none; stroke: var(--g-hi); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { margin: 2px 0 8px; font: 700 17px/1.2 var(--body); letter-spacing: .06em; }
.card p { margin: 0; font-size: 13px; line-height: 1.6; color: var(--muted); }

.steps { margin: 72px 0 0; }
h2 { margin: 0 0 20px; font: 700 22px/1.3 var(--disp); letter-spacing: .06em; text-align: center; }
.steps ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: s; }
.steps li { position: relative; display: flex; gap: 14px; padding: 18px; border-radius: 12px; background: rgba(22, 27, 34, .55); border: 1px solid rgba(139, 152, 166, .12); }
.steps li:not(:last-child)::after { content: ''; position: absolute; top: 50%; right: -14px; width: 14px; height: 1px; background: var(--line); }
.steps b { font: 700 22px/1 var(--mono); color: var(--g); text-shadow: 0 0 12px rgba(63, 185, 80, .5); }
.steps h3 { margin: 0 0 6px; font-size: 15px; letter-spacing: .04em; }
.steps p { margin: 0; font-size: 13px; color: var(--muted); }
code { font: 500 12px/1.4 var(--mono); color: var(--g-hi); background: rgba(63, 185, 80, .1); padding: 1px 6px; border-radius: 4px; word-break: break-all; }

.notes { max-width: 760px; margin: 56px auto 0; }
details { border-bottom: 1px solid rgba(139, 152, 166, .14); }
summary { cursor: pointer; padding: 16px 4px; font-size: 14.5px; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: '+'; font: 400 18px/1 var(--mono); color: var(--g); transition: transform .25s; }
details[open] summary::after { transform: rotate(45deg); }
summary:focus-visible { outline: 2px solid rgba(126, 231, 135, .6); outline-offset: 2px; border-radius: 4px; }
details p { margin: 0 4px 16px; font-size: 13.5px; color: var(--muted); }
details b { color: var(--ink); }

.foot { max-width: 1080px; margin: 64px auto 0; padding: 24px 24px calc(32px + env(safe-area-inset-bottom, 0px)); text-align: center; border-top: 1px solid rgba(139, 152, 166, .1); }
.foot p { margin: 4px 0; font-size: 13px; color: var(--muted); }
.foot #contact { color: var(--ink); font-size: 14px; }
.foot .dim { color: var(--dim); font-size: 12px; }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } }
@keyframes halo { 0%, 100% { opacity: .35; transform: scale(.92); } 50% { opacity: .85; transform: scale(1.06); } }
@keyframes orbit { to { --a: 360deg; } }
@keyframes sweep { to { transform: translateX(110%); } }
@keyframes runL { 0% { left: 0; opacity: 0; } 15% { opacity: 1; } 70% { left: calc(100% - 6px); opacity: 1; } 100% { left: calc(100% - 6px); opacity: 0; } }

@media (max-width: 860px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .steps ol { grid-template-columns: 1fr; }
  .steps li:not(:last-child)::after { display: none; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
  .hero { padding-top: 28px; }
  .cta { padding: 0 28px; height: 52px; font-size: 16px; }
  .top { padding: 14px 16px; } main { padding: 0 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}