/* ============================================================
   比特彗星中文版 · 深空彗星主题
   ============================================================ */
:root {
  --bg: #070b16;
  --bg-2: #0b1122;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-strong: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.09);
  --border-hi: rgba(255, 255, 255, 0.2);
  --text: #e8eefb;
  --text-2: #9aa8c4;
  --text-3: #6b7a99;
  --comet: #ff8a3d;
  --comet-hi: #ffb066;
  --comet-glow: rgba(255, 138, 61, 0.45);
  --cyan: #4fd1ff;
  --radius: 16px;
  --maxw: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: "HarmonyOS Sans SC", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--comet); color: #fff; }

a { color: var(--cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--comet-hi); }

img { max-width: 100%; display: block; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 背景星尘 ---------- */
.stars {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 70% -10%, rgba(79, 209, 255, 0.09), transparent 60%),
    radial-gradient(ellipse 60% 40% at 15% 5%, rgba(255, 138, 61, 0.07), transparent 55%),
    var(--bg);
}
.stars::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 22%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 34% 8%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1.2px 1.2px at 58% 30%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 78% 12%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1.4px 1.4px at 90% 44%, rgba(255,255,255,0.28), transparent),
    radial-gradient(1px 1px at 24% 64%, rgba(255,255,255,0.22), transparent),
    radial-gradient(1.2px 1.2px at 66% 78%, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 44% 90%, rgba(255,255,255,0.25), transparent);
}

/* ---------- 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(7, 11, 22, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav-bar { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo .logo-icon {
  width: 38px; height: 38px; flex: none; display: block;
  border-radius: 9px;
  filter: drop-shadow(0 0 10px rgba(255, 138, 61, 0.4));
}
.logo-text { font-size: 20px; font-weight: 800; letter-spacing: 0.5px; color: var(--text); }
.logo-text em { font-style: normal; color: var(--comet-hi); }
.nav-links { display: flex; gap: 4px; list-style: none; }
.nav-links a {
  padding: 8px 16px; border-radius: 10px; font-size: 15px;
  color: var(--text-2); transition: all 0.2s;
}
.nav-links a:hover { color: var(--text); background: var(--panel-strong); }
.nav-links a.active { color: #fff; background: linear-gradient(135deg, rgba(255,138,61,0.22), rgba(255,138,61,0.1)); box-shadow: inset 0 0 0 1px rgba(255,138,61,0.4); }
.nav-toggle { display: none; background: none; border: none; font-size: 26px; color: var(--text); cursor: pointer; line-height: 1; }

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; padding: 14px 24px 22px;
    background: rgba(7, 11, 22, 0.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(18px);
  }
  .nav-links.open { display: flex; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 15px 40px; border-radius: 14px;
  font-size: 17px; font-weight: 700; letter-spacing: 0.5px;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s;
  cursor: pointer; border: none;
}
.btn-comet {
  background: linear-gradient(135deg, var(--comet) 0%, #ff6a1f 100%);
  color: #fff;
  box-shadow: 0 6px 26px var(--comet-glow), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-comet:hover {
  color: #fff; transform: translateY(-3px);
  box-shadow: 0 10px 38px var(--comet-glow), 0 0 60px rgba(255,138,61,0.3), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-line {
  border: 1.5px solid var(--border-hi); color: var(--text);
  background: var(--panel);
  margin-left: 14px;
}
.btn-line:hover { color: #fff; border-color: var(--comet); background: rgba(255,138,61,0.08); transform: translateY(-3px); }
.btn .arr { transition: transform 0.2s; }
.btn:hover .arr { transform: translateX(4px); }

/* ---------- Hero ---------- */
.hero { padding: 88px 0 72px; position: relative; }
.hero-inner { display: flex; align-items: center; gap: 56px; flex-wrap: wrap; }
.hero-text { flex: 1 1 440px; animation: rise 0.8s ease both; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--comet-hi);
  background: rgba(255, 138, 61, 0.1);
  border: 1px solid rgba(255, 138, 61, 0.35);
  padding: 6px 16px; border-radius: 999px; margin-bottom: 22px;
}
.hero-badge::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--comet); box-shadow: 0 0 10px var(--comet);
  animation: pulse 2s infinite;
}
.hero h1 { font-size: 46px; line-height: 1.25; font-weight: 800; letter-spacing: 1px; margin-bottom: 18px; }
.grad-text {
  background: linear-gradient(100deg, #ffd9a8 0%, var(--comet-hi) 45%, var(--cyan) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: 17.5px; color: var(--text-2); margin-bottom: 30px; max-width: 520px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 26px; margin-bottom: 36px; }
.hero-meta .m { display: flex; flex-direction: column; gap: 2px; }
.hero-meta .m b { color: var(--text); font-size: 15px; }
.hero-meta .m span { color: var(--text-3); font-size: 12.5px; }

.hero-shot { flex: 1 1 480px; max-width: 560px; position: relative; animation: rise 0.8s 0.15s ease both; }
.hero-shot img { width: 100%; height: auto; }
.hero-shot::before {
  content: ""; position: absolute; inset: -8% -6%;
  background: radial-gradient(ellipse at center, rgba(255,138,61,0.18), transparent 65%);
  z-index: -1;
}
.shot-frame {
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--border-hi);
  box-shadow: 0 30px 80px rgba(0,0,0,0.6), 0 0 0 6px rgba(255,255,255,0.03);
  transform: perspective(1400px) rotateY(-4deg) rotateX(1.5deg);
  transition: transform 0.4s ease;
}
.shot-frame:hover { transform: perspective(1400px) rotateY(0) rotateX(0); }
.shot-frame img { width: 100%; }
.shot-bar {
  display: flex; gap: 7px; align-items: center;
  padding: 11px 16px; background: #0d1426; border-bottom: 1px solid var(--border);
}
.shot-bar i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.shot-bar i:nth-child(1) { background: #ff5f57; }
.shot-bar i:nth-child(2) { background: #febc2e; }
.shot-bar i:nth-child(3) { background: #28c840; }
.shot-bar span { margin-left: 10px; font-size: 12px; color: var(--text-3); }

/* ---------- 区块通用 ---------- */
.section { padding: 84px 0; position: relative; }
.sec-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.sec-tag {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: 3px;
  color: var(--cyan); text-transform: uppercase; margin-bottom: 14px;
}
.sec-head h2 { font-size: 34px; font-weight: 800; letter-spacing: 0.5px; margin-bottom: 12px; }
.sec-head p { color: var(--text-2); font-size: 16px; }

/* ---------- 玻璃卡片 ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 920px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform 0.25s, border-color 0.25s, background 0.25s, box-shadow 0.25s;
  overflow: hidden;
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: radial-gradient(480px circle at var(--mx, 50%) var(--my, 0%), rgba(255,138,61,0.09), transparent 45%);
  opacity: 0; transition: opacity 0.3s; pointer-events: none;
}
.card:hover { transform: translateY(-6px); border-color: rgba(255,138,61,0.4); background: var(--panel-strong); box-shadow: 0 18px 50px rgba(0,0,0,0.45); }
.card:hover::after { opacity: 1; }
.card .icon {
  width: 52px; height: 52px; border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  font-size: 25px; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(255,138,61,0.18), rgba(79,209,255,0.1));
  border: 1px solid rgba(255,138,61,0.3);
}
.card h3 { font-size: 18.5px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.card p { color: var(--text-2); font-size: 14.5px; line-height: 1.75; }

/* ---------- 数据带 ---------- */
.stats-band {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--border); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
@media (max-width: 700px) { .stats-band { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--bg-2); padding: 34px 20px; text-align: center; transition: background 0.25s; }
.stat:hover { background: #101830; }
.stat .num { font-size: 36px; font-weight: 800; background: linear-gradient(135deg, var(--comet-hi), var(--comet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .label { color: var(--text-3); font-size: 13.5px; margin-top: 6px; }

/* ---------- 面包屑 & 页头 ---------- */
.breadcrumb { padding: 26px 0 0; font-size: 13.5px; color: var(--text-3); }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.breadcrumb li + li::before { content: "›"; margin-right: 6px; color: var(--text-3); }
.breadcrumb a { color: var(--text-2); }

.page-hero { padding: 30px 0 6px; animation: rise 0.6s ease both; }
.page-hero h1 { font-size: 38px; font-weight: 800; letter-spacing: 0.5px; }
.page-hero h1 .grad-text { display: inline; }
.page-hero p { color: var(--text-2); margin-top: 10px; font-size: 16.5px; }

/* ---------- 下载面板 ---------- */
.dl-panel {
  position: relative;
  background: linear-gradient(160deg, #101a33 0%, #0b1122 60%);
  border: 1px solid rgba(255,138,61,0.28);
  border-radius: 22px;
  padding: 56px 40px;
  text-align: center;
  overflow: hidden;
}
.dl-panel::before {
  content: ""; position: absolute; top: -120px; left: 50%; transform: translateX(-50%);
  width: 560px; height: 260px;
  background: radial-gradient(ellipse, rgba(255,138,61,0.22), transparent 68%);
  pointer-events: none;
}
.dl-panel h2 { font-size: 30px; font-weight: 800; margin-bottom: 8px; position: relative; }
.dl-panel .sub { color: var(--text-2); margin-bottom: 34px; position: relative; }
.dl-panel .sub b { color: var(--comet-hi); }
.dl-btn-big {
  position: relative;
  display: inline-flex; align-items: center; gap: 12px;
  background: linear-gradient(135deg, var(--comet) 0%, #ff6a1f 100%);
  color: #fff; font-size: 21px; font-weight: 800;
  padding: 18px 58px; border-radius: 16px;
  box-shadow: 0 8px 34px var(--comet-glow), inset 0 1px 0 rgba(255,255,255,0.35);
  transition: transform 0.2s, box-shadow 0.2s;
  animation: breathe 3.2s ease-in-out infinite;
}
.dl-btn-big:hover { color: #fff; transform: translateY(-3px) scale(1.02); box-shadow: 0 14px 48px var(--comet-glow), 0 0 70px rgba(255,138,61,0.35); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; background: var(--bg-2); }
th, td { padding: 15px 22px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--border); }
th { background: #101a33; color: var(--comet-hi); font-weight: 700; white-space: nowrap; }
td { color: var(--text-2); }
td:first-child { color: var(--text); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.02); }

/* ---------- 步骤 ---------- */
.steps { display: grid; gap: 18px; }
.step {
  position: relative;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px 28px 104px;
  transition: border-color 0.25s, transform 0.25s;
}
.step:hover { border-color: rgba(255,138,61,0.4); transform: translateX(6px); }
.step .no {
  position: absolute; left: 28px; top: 26px;
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 23px; font-weight: 800; color: var(--comet-hi);
  background: linear-gradient(135deg, rgba(255,138,61,0.2), rgba(255,138,61,0.05));
  border: 1px solid rgba(255,138,61,0.35);
}
.step h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.step p, .step li { color: var(--text-2); font-size: 14.5px; }
.step ul { padding-left: 20px; }

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; margin-bottom: 14px; overflow: hidden;
  transition: border-color 0.25s;
}
.faq-item[open] { border-color: rgba(255,138,61,0.4); }
.faq-item summary {
  cursor: pointer; padding: 20px 56px 20px 26px;
  font-weight: 700; font-size: 16px; color: var(--text);
  list-style: none; position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 24px; top: 50%;
  transform: translateY(-50%);
  font-size: 24px; font-weight: 400; color: var(--comet-hi);
  transition: transform 0.25s;
}
.faq-item[open] summary::after { content: "−"; transform: translateY(-50%) rotate(180deg); }
.faq-body { padding: 0 26px 22px; color: var(--text-2); font-size: 14.5px; }
.faq-body p { margin-bottom: 8px; }

/* ---------- 教程文档 ---------- */
.with-toc { display: grid; grid-template-columns: 230px 1fr; gap: 44px; align-items: start; }
@media (max-width: 920px) { .with-toc { grid-template-columns: 1fr; } .toc { display: none; } }
.toc {
  position: sticky; top: 96px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 22px;
}
.toc h4 { font-size: 12.5px; letter-spacing: 2.5px; color: var(--text-3); text-transform: uppercase; margin-bottom: 14px; }
.toc ul { list-style: none; }
.toc a {
  display: block; padding: 7px 0; font-size: 14px; color: var(--text-2);
  border-left: 2px solid transparent; padding-left: 14px; margin-left: -14px;
  transition: all 0.2s;
}
.toc a:hover { color: var(--comet-hi); border-left-color: var(--comet); }
article.doc h2 {
  font-size: 26px; font-weight: 800; margin: 46px 0 16px;
  padding-left: 16px; border-left: 4px solid var(--comet);
}
article.doc h2:first-child { margin-top: 0; }
article.doc h3 { font-size: 18px; font-weight: 700; color: var(--comet-hi); margin: 26px 0 10px; }
article.doc p { color: var(--text-2); font-size: 15.5px; margin-bottom: 10px; }
article.doc li { color: var(--text-2); font-size: 15px; margin-bottom: 7px; }
article.doc ul, article.doc ol { padding-left: 24px; margin-bottom: 14px; }
article.doc strong { color: var(--text); }
article.doc code {
  font-family: Consolas, Monaco, monospace; font-size: 13.5px;
  background: rgba(79,209,255,0.1); color: var(--cyan);
  border: 1px solid rgba(79,209,255,0.22);
  padding: 1.5px 8px; border-radius: 6px;
}

/* ---------- 提示框 ---------- */
.note {
  background: rgba(255, 138, 61, 0.07);
  border: 1px solid rgba(255, 138, 61, 0.3);
  border-radius: 12px; padding: 18px 22px;
  margin: 26px 0; font-size: 14.5px; color: var(--text-2);
}
.note::before { content: "💡 "; }

/* ---------- CTA ---------- */
.cta {
  position: relative;
  background: linear-gradient(140deg, #13203f 0%, #0b1122 70%);
  border: 1px solid var(--border-hi);
  border-radius: 22px;
  text-align: center; padding: 60px 28px;
  overflow: hidden;
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 120%, rgba(255,138,61,0.18), transparent 60%);
}
.cta h2 { font-size: 28px; font-weight: 800; margin-bottom: 10px; position: relative; }
.cta p { color: var(--text-2); margin-bottom: 30px; position: relative; }
.cta .btn { position: relative; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 60px;
  background: #05070f;
  border-top: 1px solid var(--border);
  padding: 54px 0 28px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 34px;
  padding-bottom: 34px; border-bottom: 1px solid var(--border);
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h4 { color: var(--text); font-size: 14.5px; margin-bottom: 16px; }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 9px; }
.footer-grid a { color: var(--text-3); font-size: 13.5px; }
.footer-grid a:hover { color: var(--comet-hi); }
.footer-desc { color: var(--text-3); font-size: 13.5px; max-width: 300px; }
.footer-bottom { padding-top: 22px; text-align: center; font-size: 12.5px; color: var(--text-3); }

/* ---------- 动画 ---------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
@keyframes breathe {
  0%, 100% { box-shadow: 0 8px 34px var(--comet-glow), inset 0 1px 0 rgba(255,255,255,0.35); }
  50% { box-shadow: 0 8px 44px rgba(255,138,61,0.65), 0 0 50px rgba(255,138,61,0.25), inset 0 1px 0 rgba(255,255,255,0.35); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}