:root {
  /* 品牌色（brand/BRAND.md）：信任蓝 #5788FF，渐变 #5788FF→#386EFF→#2D5BFF，藏青 #030333 */
  --ink: #030333;
  --blue: #5788ff;
  --blue-2: #386eff;
  --blue-3: #2d5bff;
  --navy: #030333;
  --navy-2: #0b0b45;
  --brand-gradient: linear-gradient(180deg, #5788ff 0%, #386eff 61%, #2d5bff 100%);
  --bg: #ffffff;
  --bg-soft: #f3f6fd;
  --fg: var(--ink);
  --body: #24244a;
  --muted: #55557a;
  --rule: #d6dcee;
  --accent: var(--blue);
  --accent-ink: var(--blue-3);
  --primary: var(--blue-3);
  --primary-hover: #2449d9;
  --on-navy: #ffffff;
  --on-navy-muted: #b9c3e6;
  --term-bg: #02021c;
  --term-fg: #e6ebfa;
  --term-dim: #8088b0;
  --term-key: #9db8ff;
  --term-str: #ffd58a;
  --term-num: #8fe3b8;
  --radius: 4px;
  --wrap: 1160px;
  --gutter: 20px;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; }
img, svg { display: block; }
code { font-family: var(--mono); font-size: 0.9em; background: var(--bg-soft); padding: 0.05em 0.35em; border-radius: 3px; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; background: var(--fg); color: var(--bg); padding: 6px 10px; z-index: 10; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }

/* header */
.site-header { border-bottom: 1px solid rgba(255, 255, 255, 0.12); position: sticky; top: 0; background: var(--navy); color: var(--on-navy); z-index: 5; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.logo { display: flex; align-items: center; text-decoration: none; flex-shrink: 0; }
.logo-img { height: 30px; width: auto; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 15px; }
.nav a { text-decoration: none; }
.nav a:not(.btn):hover { text-decoration: underline; text-underline-offset: 4px; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 20px; border: 1px solid var(--fg); border-radius: var(--radius);
  font-size: 15px; font-weight: 600; text-decoration: none; line-height: 1.2;
  transition: background .15s, color .15s;
}
.btn-sm { padding: 6px 14px; font-size: 14px; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-outline { background: transparent; color: var(--fg); }
.btn-outline:hover { background: var(--fg); color: var(--bg); }
.btn-invert { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-invert:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-outline-invert { color: var(--on-navy); border-color: rgba(255, 255, 255, 0.55); }
.btn-outline-invert:hover { background: #fff; color: var(--navy); border-color: #fff; }

/* hero */
/* hero：反白风格（藏青底 + 白字 + 蓝色象形） */
.hero { position: relative; overflow: hidden; padding: 72px 0 88px; background: var(--navy); color: var(--on-navy); }
.hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(87, 136, 255, 0.07) 1px, transparent 1px), linear-gradient(90deg, rgba(87, 136, 255, 0.07) 1px, transparent 1px); background-size: 32px 32px; pointer-events: none; }
.hero-mark { position: absolute; right: -200px; top: -40px; width: 680px; max-width: none; height: auto; opacity: 0.22; pointer-events: none; }
.hero .wrap { position: relative; }
.hero .eyebrow { color: var(--on-navy-muted); }
.hero .lede { color: #d5dcf3; }
.hero .lede code { background: rgba(87, 136, 255, 0.2); color: #fff; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 48px; align-items: center; }
.eyebrow { font-size: 13px; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 18px; }
.eyebrow::before { content: "■ "; color: var(--accent); }
h1 { color: inherit; font-size: clamp(32px, 5vw, 56px); line-height: 1.18; margin: 0 0 24px; font-weight: 800; letter-spacing: -0.01em; }
.lede { font-size: 17px; color: var(--body); margin: 0 0 32px; max-width: 34em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* terminal */
.terminal { border: 1px solid var(--blue); border-radius: 6px; background: var(--term-bg); color: var(--term-fg); box-shadow: 6px 6px 0 var(--blue-2); min-width: 0; }
.term-bar { display: flex; align-items: center; gap: 6px; padding: 9px 12px; border-bottom: 1px solid #1d1d4d; }
.term-bar span { width: 10px; height: 10px; border-radius: 50%; border: 1px solid #4a4f80; }
.term-bar span:first-child { background: var(--accent); border-color: var(--accent); }
.term-bar em { margin-left: auto; font-style: normal; font-size: 12px; color: var(--term-dim); }
.term-body { margin: 0; padding: 16px 18px; overflow-x: auto; font-size: 12.5px; line-height: 1.6; white-space: pre; }
.term-body code { background: none; padding: 0; font-size: inherit; color: inherit; }
.c-prompt { color: var(--accent); }
.c-dim { color: var(--term-dim); }
.c-key { color: var(--term-key); }
.c-str { color: var(--term-str); }
.c-num { color: var(--term-num); }
.cursor { animation: blink 1.1s steps(1) infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }

/* sections */
section { padding: 72px 0; }
.section-title { font-size: clamp(24px, 3vw, 34px); margin: 0 0 36px; font-weight: 800; display: flex; align-items: baseline; gap: 14px; }
.idx { font-size: 13px; font-weight: 500; color: var(--accent-ink); border: 1px solid currentColor; padding: 1px 6px; border-radius: 2px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--fg); border-left: 1px solid var(--fg); }
.pillar { padding: 28px 24px; border-right: 1px solid var(--fg); border-bottom: 1px solid var(--fg); display: flex; flex-direction: column; min-width: 0; }
.pillar h3 { margin: 0 0 12px; font-size: 22px; }
.pillar p { margin: 0 0 20px; color: var(--body); flex: 1; }
.snippet { margin: 0; padding: 10px 12px; background: var(--bg-soft); border: 1px dashed var(--rule); font-size: 13px; overflow-x: auto; white-space: pre; }

.primitives { background: var(--bg-soft); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.prim-list { margin: 0; display: grid; gap: 0; }
.prim { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 24px; padding: 22px 0; border-top: 1px solid var(--rule); }
.prim:last-child { border-bottom: 1px solid var(--rule); }
.prim dt { font-size: 24px; font-weight: 700; color: var(--blue-3); }
.prim dd { margin: 0; color: var(--body); }
.prim dd strong { color: var(--fg); }

/* pricing */
.price-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; align-items: start; }
.price-big { font-size: clamp(28px, 4.5vw, 48px); font-weight: 800; line-height: 1.2; margin: 0 0 14px; }
.price-big .mono { font-size: 1.5em; letter-spacing: -0.03em; }
.price-small { font-size: 13px; color: var(--muted); margin: 0 0 18px; border-left: 3px solid var(--accent); padding-left: 10px; }
.compare { border: 1px solid var(--fg); padding: 24px; min-width: 0; }
.compare h3 { margin: 0 0 16px; font-size: 18px; }
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--rule); vertical-align: top; }
thead th { font-family: var(--mono); font-size: 13px; border-bottom: 1px solid var(--fg); }
tbody th { font-weight: 500; color: var(--muted); }
td:nth-child(2) { font-weight: 700; }
.footnote { font-size: 12.5px; color: var(--muted); margin: 14px 0 0; }
.footnote::before { content: "※ "; }

/* use cases */
.uc-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.uc-grid a { display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 20px; border: 1px solid var(--fg); text-decoration: none; transition: transform .15s, box-shadow .15s; }
.uc-grid a:hover { transform: translate(-3px, -3px); box-shadow: 3px 3px 0 var(--accent); }
.uc-grid .mono { font-size: 12px; color: var(--accent-ink); }
.uc-grid strong { font-size: 18px; }
.uc-grid em { font-style: normal; color: var(--muted); font-size: 14px; }

/* faq */
.faq { border-top: 1px solid var(--rule); }
.faq-list a { color: var(--blue-3); }
.faq-list { border-top: 1px solid var(--fg); max-width: 880px; }
details { border-bottom: 1px solid var(--fg); }
summary { cursor: pointer; list-style: none; padding: 18px 36px 18px 0; font-weight: 700; font-size: 17px; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-family: var(--mono); position: absolute; right: 4px; top: 16px; font-size: 20px; }
details[open] summary::after { content: "−"; color: var(--accent); }
details p { margin: 0 0 20px; color: var(--body); max-width: 46em; }

/* CTA */
.cta-band { position: relative; background: var(--navy); color: var(--on-navy); padding: 64px 0; }
.cta-mark { width: 64px; height: auto; flex-shrink: 0; }
.cta-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; }
.cta-title { font-size: clamp(22px, 3.2vw, 34px); font-weight: 800; margin: 0; }
.cta-title { flex: 1 1 320px; }
.cta-title code { background: rgba(87, 136, 255, 0.2); color: #9db8ff; }

/* footer */
.site-footer { padding: 28px 0 40px; font-size: 14px; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a, .legal a { text-decoration: none; }
.footer-links a:hover, .legal a:hover { text-decoration: underline; }
.legal { margin: 0; font-size: 12.5px; color: var(--muted); }

/* responsive */
@media (max-width: 960px) {
  .hero-grid, .price-grid { grid-template-columns: minmax(0, 1fr); }
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .uc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  :root { --gutter: 16px; }
  .nav { gap: 14px; font-size: 14px; }
  .hero { padding: 44px 0 56px; }
  .hero-mark { width: 340px; right: -70px; bottom: auto; top: -30px; opacity: 0.16; }
  .logo-img { height: 26px; }
  .cta-mark { width: 48px; }
  section { padding: 52px 0; }
  .prim { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .uc-grid { grid-template-columns: minmax(0, 1fr); }
  .terminal { box-shadow: 4px 4px 0 var(--blue-2); }
  .term-body { font-size: 11.5px; }
  .cta-row .btn { flex: 1 1 100%; }
  .compare { padding: 16px; }
}
@media (max-width: 380px) {
  .logo-img { height: 24px; }
  .nav a:nth-child(2) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .cursor { animation: none; }
  .btn, .uc-grid a { transition: none; }
  .uc-grid a:hover { transform: none; }
}

/* community */
.community { border-top: 1px solid var(--rule); }
.community-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--fg); }
.community-card { display: flex; flex-direction: column; gap: 6px; padding: 22px 20px 24px 0; text-align: left; font: inherit; color: inherit; text-decoration: none; background: none; border: 0; border-bottom: 1px solid var(--fg); cursor: pointer; }
.community-card + .community-card { padding-left: 20px; border-left: 1px solid var(--rule); }
.community-card .mono { font-size: 12px; color: var(--accent-ink); }
.community-card strong { font-size: 17px; }
.community-card em { font-style: normal; color: var(--muted); font-size: 14px; }
.community-card:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.link-btn { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
.link-btn:hover { text-decoration: underline; }

/* filings (ICP / 公安 / 生成式 AI 备案) */
.filings { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 18px; margin-top: 14px; font-size: 12px; color: var(--muted); }
.filings a { color: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 4px; }
.filings a:hover { text-decoration: underline; }
.filings .badge { flex-shrink: 0; }

/* wechat dialog */
.wechat-dialog { border: 1px solid var(--rule); border-radius: 10px; padding: 22px 24px 24px; width: min(340px, calc(100vw - 32px)); color: var(--fg); box-shadow: 0 20px 60px rgba(3, 3, 51, 0.22); }
.wechat-dialog::backdrop { background: rgba(3, 3, 51, 0.35); }
.wechat-dialog h3 { margin: 0; font-size: 17px; }
.wechat-title { margin: 4px 0 16px; font-size: 13px; color: var(--muted); }
.wechat-body { display: flex; flex-direction: column; align-items: center; }
.wechat-body img { width: 240px; max-width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 8px; }
.wechat-note { margin: 12px 0 0; font-size: 13px; color: var(--muted); text-align: center; line-height: 1.7; }
.wechat-note a { color: var(--blue-3); }
.wechat-close { position: absolute; top: 10px; right: 12px; font-size: 22px; line-height: 1; background: none; border: 0; color: var(--muted); cursor: pointer; padding: 4px; }
.wechat-close:hover { color: var(--fg); }

@media (max-width: 760px) {
  .community-grid { grid-template-columns: minmax(0, 1fr); }
  .community-card + .community-card { padding-left: 0; border-left: 0; }
}
.wechat-dialog h3:focus { outline: none; }

/* 首页终端：请求 / 响应 两个标签页 + 复制命令 */
.term-tabs { display: flex; gap: 2px; margin-left: 10px; }
.term-tab { font: 12px/1 var(--mono, ui-monospace, monospace); color: var(--term-dim); background: none; border: 1px solid transparent; border-radius: 4px; padding: 5px 9px; cursor: pointer; }
.term-tab:hover { color: var(--term-fg); }
.term-tab.is-active { color: var(--term-fg); border-color: #2a2f6a; background: #0d0d3a; }
.term-copy { margin-left: auto; font-size: 12px; color: var(--term-fg); background: var(--blue-3, #2d5bff); border: 0; border-radius: 4px; padding: 5px 10px; cursor: pointer; }
.term-copy:hover { background: #2449d9; }
.term-copy.is-done { background: #1f7a4d; }
.term-bar em { display: none; }
.term-body { max-height: 440px; overflow: auto; }
.term-note { margin: 0; padding: 8px 18px 12px; font-size: 11.5px; color: var(--term-dim); border-top: 1px solid #1d1d4d; }
.term-note a { color: var(--term-key); }
@media (max-width: 640px) { .term-tab { padding: 5px 7px; } .term-copy { padding: 5px 8px; } }