/* ================================================================
   API中转站 官网样式表
   主题：深空蓝 + 靛蓝/青色渐变，纯 CSS，无 JS，移动端自适应
   ================================================================ */

:root {
  --bg: #070b16;
  --bg-2: #0a1020;
  --surface: #0f1730;
  --surface-2: #121c3a;
  --border: rgba(148, 163, 218, .16);
  --border-strong: rgba(148, 163, 218, .30);
  --text: #e9edf8;
  --text-sub: #9aa7c4;
  --text-dim: #6f7d9c;
  --indigo: #6366f1;
  --indigo-light: #818cf8;
  --cyan: #22d3ee;
  --green: #34d399;
  --amber: #fbbf24;
  --red: #fb7185;
  --radius: 16px;
  --radius-sm: 10px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Consolas, monospace;
  --shadow: 0 24px 60px rgba(0, 0, 0, .45);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 无障碍：跳到主内容 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--indigo);
  color: #fff;
  padding: 10px 18px;
  border-radius: 0 0 8px 0;
  z-index: 999;
}
.skip-link:focus { left: 0; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(120deg, var(--indigo), var(--cyan));
  color: #05080f;
  box-shadow: 0 10px 30px rgba(99, 102, 241, .35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(34, 211, 238, .38); }
.btn-ghost {
  background: rgba(148, 163, 218, .07);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover { background: rgba(148, 163, 218, .14); border-color: var(--indigo-light); }
.btn-sm { padding: 9px 20px; font-size: 14px; border-radius: 10px; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(7, 11, 22, .82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 68px;
}
.logo { display: flex; align-items: center; flex: none; }
.logo img { height: 34px; width: auto; display: block; }
.main-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14.5px;
  color: var(--text-sub);
  overflow-x: auto;
  scrollbar-width: none;
  white-space: nowrap;
}
.main-nav::-webkit-scrollbar { display: none; }
.main-nav a { position: relative; padding: 4px 0; transition: color .2s; }
.main-nav a:hover { color: var(--text); }
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--indigo), var(--cyan));
  transition: width .25s ease;
}
.main-nav a:hover::after { width: 100%; }
.header-actions { flex: none; }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 520px at 12% -10%, rgba(99, 102, 241, .28), transparent 60%),
    radial-gradient(760px 520px at 92% 8%, rgba(34, 211, 238, .18), transparent 62%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 218, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 218, .05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(760px 420px at 30% 20%, #000 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(760px 420px at 30% 20%, #000 20%, transparent 80%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 56px;
  align-items: center;
  padding: 84px 24px 92px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--cyan);
  background: rgba(34, 211, 238, .09);
  border: 1px solid rgba(34, 211, 238, .28);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 26px;
}
.badge .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(52, 211, 153, .18);
}
.hero h1 {
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -.02em;
}
.grad {
  background: linear-gradient(100deg, var(--indigo-light) 10%, var(--cyan) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  margin-top: 22px;
  max-width: 620px;
  font-size: 17px;
  color: var(--text-sub);
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}
.hero-note {
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--text-dim);
}

/* 终端代码卡片 */
.code-card {
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.code-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, .22);
}
.code-head .dots { display: flex; gap: 6px; }
.code-head .dots i {
  width: 10px; height: 10px;
  border-radius: 50%;
  display: block;
  background: #3b476b;
}
.code-head .dots i:first-child { background: #fb7185; }
.code-head .dots i:nth-child(2) { background: #fbbf24; }
.code-head .dots i:nth-child(3) { background: #34d399; }
.code-head span {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text-dim);
  margin-left: 6px;
}
.code-card pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: #cfd8f0;
}
.code-card code { font-family: inherit; }
.c-cmt { color: #64748b; }
.c-key { color: var(--indigo-light); }
.c-str { color: var(--green); }
.c-fn  { color: var(--cyan); }

/* 统计条 */
.stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 0 24px 84px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}
.stats li {
  background: rgba(148, 163, 218, .05);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  text-align: center;
}
.stats .num {
  display: block;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -.03em;
  background: linear-gradient(100deg, var(--indigo-light), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stats .label { font-size: 13px; color: var(--text-sub); }

/* ---------------- 通用区块 ---------------- */
.section { padding: 92px 0; position: relative; }
.section-alt { background: linear-gradient(180deg, rgba(148, 163, 218, .045), rgba(148, 163, 218, .015)); border-block: 1px solid var(--border); }
.section-head { max-width: 780px; margin-bottom: 48px; }
.section-head.center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}
.section h2 {
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1.32;
  font-weight: 800;
  letter-spacing: -.02em;
}
.section-sub {
  margin-top: 16px;
  font-size: 16.5px;
  color: var(--text-sub);
}
.lead { font-size: 16.5px; color: var(--text-sub); max-width: 900px; }
.lead + .lead { margin-top: 16px; }
.lead b, .prose b { color: var(--text); font-weight: 700; }
.prose { font-size: 16px; color: var(--text-sub); max-width: 900px; }
.prose p + p { margin-top: 14px; }
.hl { color: var(--cyan); font-weight: 600; }

/* ---------------- 定义区（是什么） ---------------- */
.def-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 44px;
  align-items: start;
}
.pain-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.pain-list li {
  display: flex;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
}
.pain-list .ico {
  flex: none;
  width: 42px; height: 42px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  font-size: 19px;
  background: linear-gradient(140deg, rgba(99, 102, 241, .22), rgba(34, 211, 238, .16));
  border: 1px solid var(--border);
}
.pain-list h3 { font-size: 16px; font-weight: 700; }
.pain-list p { font-size: 14.5px; color: var(--text-sub); margin-top: 3px; }

/* ---------------- 能力卡片 ---------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.card {
  position: relative;
  background: linear-gradient(155deg, rgba(99, 102, 241, .10), rgba(15, 23, 48, 0) 55%), var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 20px 46px rgba(0, 0, 0, .4);
}
.card .ico {
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font-size: 21px;
  margin-bottom: 18px;
  background: linear-gradient(140deg, rgba(99, 102, 241, .24), rgba(34, 211, 238, .16));
  border: 1px solid var(--border);
}
.card h3 { font-size: 17.5px; font-weight: 700; }
.card p { margin-top: 9px; font-size: 14.5px; color: var(--text-sub); }

/* ---------------- 表格 ---------------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  -webkit-overflow-scrolling: touch;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  min-width: 640px;
}
caption {
  caption-side: top;
  text-align: left;
  padding: 16px 20px 4px;
  font-size: 13.5px;
  color: var(--text-dim);
}
th, td {
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
thead th {
  background: rgba(99, 102, 241, .12);
  color: #cdd6f4;
  font-weight: 700;
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(148, 163, 218, .04); }
td b { color: var(--text); }
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}
.tag-good { background: rgba(52, 211, 153, .14); color: var(--green); }
.tag-warn { background: rgba(251, 191, 36, .14); color: var(--amber); }
.tag-bad  { background: rgba(251, 113, 133, .14); color: var(--red); }
.tag-info { background: rgba(99, 102, 241, .16); color: var(--indigo-light); }
.note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--text-dim);
  max-width: 900px;
}

/* ---------------- 接入步骤 ---------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 40px;
}
.step {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px 24px;
  overflow: hidden;
}
.step::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--indigo), var(--cyan));
}
.step .num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: .1em;
}
.step h3 { font-size: 17px; margin-top: 6px; }
.step p { margin-top: 8px; font-size: 14.5px; color: var(--text-sub); }

.code-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 18px;
}
.code-block > h3 {
  font-size: 15px;
  font-weight: 700;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, .2);
  color: #cdd6f4;
}
.code-block pre {
  margin: 0;
  padding: 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.9;
  color: #cfd8f0;
}
.code-cols {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.code-cols .code-block { margin-top: 0; }

/* ---------------- 避坑 / 清单 ---------------- */
.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.check-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}
.check-box h3 {
  font-size: 17px;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.check-box ul { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.check-box li {
  font-size: 14.5px;
  color: var(--text-sub);
  padding-left: 26px;
  position: relative;
}
.check-box li::before {
  position: absolute;
  left: 0; top: 0;
  font-weight: 700;
}
.box-red li::before { content: "✕"; color: var(--red); }
.box-green li::before { content: "✓"; color: var(--green); }

/* ---------------- 术语表 ---------------- */
.terms {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 40px;
  max-width: 1000px;
}
.terms div {
  padding: 18px 0;
  border-bottom: 1px dashed var(--border);
}
.terms dt { font-size: 15.5px; font-weight: 700; color: var(--text); }
.terms dd { font-size: 14.5px; color: var(--text-sub); margin-top: 5px; }

/* ---------------- FAQ ---------------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 940px;
}
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2px 22px;
  transition: border-color .2s;
}
.faq-item[open] { border-color: var(--border-strong); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  padding: 17px 34px 17px 0;
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 2px; top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--cyan);
  line-height: 1;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item .answer {
  padding: 0 0 20px;
  font-size: 15px;
  color: var(--text-sub);
}
.faq-item .answer p + p { margin-top: 10px; }

/* ---------------- CTA ---------------- */
.cta-band {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(700px 340px at 50% 0%, rgba(99, 102, 241, .3), transparent 70%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  text-align: center;
}
.cta-band .container { max-width: 820px; }
.cta-band h2 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; letter-spacing: -.02em; }
.cta-band p { margin-top: 18px; color: var(--text-sub); font-size: 16.5px; }
.cta-band .hero-cta { justify-content: center; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: #060911;
  padding: 56px 0 34px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 36px;
}
.footer-brand img { height: 32px; margin-bottom: 14px; }
.footer-brand p { font-size: 14px; color: var(--text-dim); max-width: 320px; }
.footer-col h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 14px; color: var(--text-dim); transition: color .2s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 920px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; padding: 60px 24px 64px; }
  .hero-sub { max-width: none; }
  .def-grid { grid-template-columns: 1fr; gap: 32px; }
  .steps { grid-template-columns: 1fr; }
  .code-cols { grid-template-columns: 1fr; }
  .check-grid { grid-template-columns: 1fr; }
  .terms { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); padding-bottom: 60px; }
  .main-nav { display: none; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .container { padding: 0 18px; }
  .section { padding: 62px 0; }
  .section-head { margin-bottom: 34px; }
  .header-inner { height: 60px; }
  .logo img { height: 30px; }
  .hero-inner { padding: 46px 18px 52px; }
  .hero-cta { gap: 10px; }
  .hero-cta .btn { flex: 1 1 100%; }
  .card-grid { grid-template-columns: 1fr; }
  .stats { padding: 0 18px 52px; gap: 12px; }
  .stats li { padding: 16px 12px; }
  .card, .check-box, .step { padding: 22px 20px; }
  .faq-item { padding: 2px 18px; }
  .faq-item summary { font-size: 15.5px; }
  .code-card pre, .code-block pre { font-size: 12.5px; padding: 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}