:root {
  color-scheme: dark;
  --bg: #070b12;
  --surface: #0d1420;
  --surface-strong: #111b2a;
  --line: #26354a;
  --text: #f4f7fb;
  --muted: #a8b5c6;
  --accent: #42d7cd;
  --accent-strong: #32b8e7;
  --pink: #ff4f83;
  --warning: #ffd166;
  --max: 72rem;
  font-family: Inter, "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 20rem;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 8% 0, rgba(50, 184, 231, .13), transparent 28rem),
    radial-gradient(circle at 100% 4%, rgba(255, 79, 131, .10), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.75;
}

a { color: #8edff5; text-underline-offset: .2em; }
a:hover { color: #c6f3ff; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: .18rem solid var(--warning); outline-offset: .2rem; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: .75rem;
  left: .75rem;
  padding: .6rem .8rem;
  border-radius: .5rem;
  background: #fff;
  color: #111;
  transform: translateY(-180%);
}
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid rgba(82, 105, 137, .45);
  background: rgba(7, 11, 18, .88);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(calc(100% - 2rem), var(--max));
  min-height: 4.5rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 2.35rem;
  height: 2.35rem;
  overflow: hidden;
  border-radius: .75rem;
  background: linear-gradient(145deg, var(--accent), var(--accent-strong));
  box-shadow: 0 0 1.8rem rgba(66, 215, 205, .2);
}
.brand-mark::after {
  position: absolute;
  right: -.35rem;
  bottom: -.35rem;
  width: 2.4rem;
  height: 1.25rem;
  border-top: .22rem solid rgba(255,255,255,.95);
  background: var(--pink);
  content: "";
  transform: rotate(-34deg);
}
.brand-copy { display: grid; line-height: 1.15; }
.brand-copy small { margin-top: .18rem; color: var(--muted); font-size: .7rem; font-weight: 500; }

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-links a {
  display: block;
  padding: .55rem .7rem;
  border-radius: .55rem;
  color: #cbd5e1;
  font-size: .87rem;
  text-decoration: none;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { background: #172337; color: #fff; }
.nav-links .login-link { margin-left: .25rem; border: 1px solid #36506f; }

main {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: clamp(2.8rem, 8vw, 5.8rem) 0 4.5rem;
}

.page-heading { max-width: 52rem; margin-bottom: 2rem; }
.eyebrow {
  margin: 0 0 .65rem;
  color: var(--accent);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.28; text-wrap: balance; }
h1 { margin: 0; font-size: clamp(2rem, 5.5vw, 3.45rem); letter-spacing: -.035em; }
.lead { margin: 1rem 0 0; color: #c5d1df; font-size: clamp(1rem, 2vw, 1.15rem); }
.meta { display: flex; flex-wrap: wrap; gap: .5rem 1rem; margin: 1.25rem 0 0; color: var(--muted); font-size: .84rem; }

.notice {
  margin: 1.8rem 0;
  padding: 1rem 1.15rem;
  border: 1px solid rgba(66, 215, 205, .28);
  border-left: .22rem solid var(--accent);
  border-radius: .75rem;
  background: rgba(66, 215, 205, .07);
  color: #d8e6ee;
}
.notice.warning { border-color: rgba(255, 209, 102, .35); border-left-color: var(--warning); background: rgba(255, 209, 102, .07); }
.notice strong { color: #fff; }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) 15rem; align-items: start; gap: 2rem; }
.content { min-width: 0; }
.content section {
  margin: 0 0 1rem;
  padding: clamp(1.2rem, 3vw, 1.8rem);
  border: 1px solid rgba(62, 82, 109, .65);
  border-radius: 1rem;
  background: linear-gradient(155deg, rgba(17, 27, 42, .96), rgba(10, 17, 28, .96));
  box-shadow: 0 1.5rem 4rem rgba(0,0,0,.16);
  scroll-margin-top: 6rem;
}
.content h2 { margin: 0 0 .8rem; font-size: 1.25rem; }
.content h3 { margin: 1.2rem 0 .35rem; font-size: 1rem; }
.content p { margin: .65rem 0; color: #c6d0dc; }
.content ul, .content ol { margin: .65rem 0; padding-left: 1.35rem; color: #c6d0dc; }
.content li + li { margin-top: .45rem; }
.content strong { color: #eef4f9; }

.toc {
  position: sticky;
  top: 6rem;
  padding: 1rem;
  border: 1px solid rgba(62, 82, 109, .65);
  border-radius: .85rem;
  background: rgba(13, 20, 32, .82);
}
.toc strong { display: block; margin-bottom: .45rem; font-size: .82rem; }
.toc a { display: block; padding: .27rem 0; color: var(--muted); font-size: .8rem; text-decoration: none; }
.toc a:hover { color: #fff; }

.steps { counter-reset: steps; margin: 0; padding: 0; list-style: none; }
.steps > li { position: relative; min-height: 3.2rem; padding: .1rem 0 1rem 3.35rem; }
.steps > li::before {
  counter-increment: steps;
  position: absolute;
  top: 0;
  left: 0;
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  border: 1px solid #42617d;
  border-radius: 50%;
  background: #142338;
  color: var(--accent);
  content: counter(steps);
  font-weight: 800;
}

.info-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: .8rem; }
.info-card { padding: 1rem; border: 1px solid #2b3b51; border-radius: .8rem; background: #0b1421; }
.info-card h3 { margin: 0 0 .35rem; color: #fff; }
.info-card p { margin: 0; font-size: .9rem; }
.request-template { padding: 1rem 1.1rem; border: 1px dashed #48617e; border-radius: .75rem; background: #090f19; }
.request-template li { padding-left: .2rem; }
.support-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.support-form label { display: grid; gap: .35rem; color: #e5edf5; font-size: .88rem; font-weight: 700; }
.support-form .wide { grid-column: 1 / -1; }
.support-form input, .support-form select, .support-form textarea {
  width: 100%;
  border: 1px solid #354a65;
  border-radius: .65rem;
  background: #080e17;
  color: var(--text);
  padding: .72rem .78rem;
  font: inherit;
}
.support-form textarea { min-height: 8.5rem; resize: vertical; }
.support-form small { color: var(--muted); font-size: .76rem; font-weight: 400; }
.support-form .consent { display: flex; align-items: flex-start; gap: .55rem; font-weight: 500; }
.support-form .consent input { width: auto; margin-top: .36rem; accent-color: var(--accent); }
.support-form button {
  justify-self: start;
  border: 0;
  border-radius: .65rem;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #041015;
  padding: .72rem 1.05rem;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}
.support-form button:disabled { opacity: .5; cursor: wait; }
.form-status { display: none; margin: 0; padding: .72rem .82rem; border: 1px solid rgba(66,215,205,.35); border-radius: .65rem; background: rgba(66,215,205,.08); color: #c9f7f2; }
.form-status.show { display: block; }
.form-status.error { border-color: rgba(255,79,131,.45); background: rgba(255,79,131,.08); color: #ffc2d3; }
.honeypot { position: absolute !important; left: -10000px !important; width: 1px !important; height: 1px !important; overflow: hidden !important; }

.site-footer { border-top: 1px solid rgba(82, 105, 137, .38); background: rgba(5, 8, 14, .76); }
.footer-inner {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding: 2.2rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem 2rem;
  align-items: start;
}
.footer-inner p { max-width: 45rem; margin: 0; color: var(--muted); font-size: .8rem; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .45rem 1rem; }
.footer-links a { color: #b8c7d9; font-size: .8rem; text-decoration: none; }
.footer-note { grid-column: 1 / -1; padding-top: .9rem; border-top: 1px solid #1e2a3c; }

@media (max-width: 58rem) {
  .nav { align-items: flex-start; padding: .8rem 0; }
  .nav-links { max-width: 33rem; flex-wrap: wrap; }
  .layout { grid-template-columns: 1fr; }
  .toc { position: static; order: -1; columns: 2; }
}

@media (max-width: 42rem) {
  .nav { display: block; }
  .brand { margin-bottom: .7rem; }
  .nav-links { justify-content: flex-start; gap: .15rem; }
  .nav-links a { padding: .38rem .5rem; }
  .nav-links .login-link { margin-left: 0; }
  main { padding-top: 2.3rem; }
  .info-grid { grid-template-columns: 1fr; }
  .support-form { grid-template-columns: 1fr; }
  .support-form .wide { grid-column: auto; }
  .toc { columns: 1; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media print {
  :root { color-scheme: light; }
  body { background: #fff; color: #111; font-size: 10pt; }
  .site-header, .toc, .site-footer, .skip-link { display: none; }
  main { width: 100%; padding: 0; }
  .page-heading { margin-bottom: 1rem; }
  .lead, .meta, .content p, .content ul, .content ol { color: #222; }
  .content section, .notice { break-inside: avoid; border-color: #bbb; background: #fff; box-shadow: none; }
  a { color: #111; }
}