/* 引见 GEO — 站点样式。CSP 为 style-src 'self'：不要在 HTML 里写 style= 属性。 */
:root {
  --ink: #0f2a3d; --ink-2: #33495a; --muted: #5d7080; --line: #dfe6ea; --bg: #ffffff; --bg-2: #f4f7f8; --bg-3: #e9f1f2;
  --accent: #0e8a7e; --accent-ink: #ffffff; --accent-soft: #e2f4f1; --mark: #fff1b8; --warn: #a15c00; --warn-bg: #fff4e0; --bad: #b42318; --bad-bg: #fdecea; --ok: #12784a; --ok-bg: #e5f5ec;
  --radius: 14px; --shadow: 0 1px 2px rgba(15, 42, 61, .06), 0 8px 24px rgba(15, 42, 61, .06);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7eef2; --ink-2: #c3d0d8; --muted: #93a6b3; --line: #2a3a46; --bg: #0d1820; --bg-2: #13222c; --bg-3: #172a35;
    --accent: #3cc3b3; --accent-ink: #062521; --accent-soft: #123a37; --mark: #5a4b12; --warn: #f0b35a; --warn-bg: #3a2a10; --bad: #ff8a80; --bad-bg: #3d1a17; --ok: #6fd6a0; --ok-bg: #12301f;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25); color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.75; color: var(--ink); background: var(--bg); }
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.3; letter-spacing: .01em; margin: 0 0 .5em; }
h1 { font-size: clamp(28px, 4.6vw, 44px); }
h2 { font-size: clamp(22px, 3vw, 28px); margin-top: 1.6em; }
h3 { font-size: 18px; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.3em; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--bg); padding: 8px 12px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 8px; }
.center { text-align: center; }
.sub { color: var(--muted); margin-top: -.2em; }
.dim { color: var(--muted); }
.note { background: var(--bg-2); border-left: 3px solid var(--accent); padding: 12px 16px; border-radius: 0 10px 10px 0; color: var(--ink-2); font-size: 15px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 14px; letter-spacing: .06em; margin-bottom: .6em; }
.lead { font-size: 18px; color: var(--ink-2); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 22px; border-radius: 999px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1.5px solid transparent; cursor: pointer; font-family: inherit; transition: transform .12s, background .12s; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.ghost { border-color: var(--line); color: var(--ink); background: var(--bg); }
.btn.small { min-height: 40px; padding: 6px 16px; font-size: 15px; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }

/* 页头 */
.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.hdr { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); min-height: 40px; }
.brand-name { font-size: 20px; font-weight: 700; letter-spacing: .04em; }
.brand-name b { color: var(--accent); margin-left: 4px; font-weight: 800; letter-spacing: .02em; }
.logo-mark { width: 34px; height: 34px; flex: none; }
.lm-bg { fill: var(--ink); } .lm-bubble { fill: var(--bg); } .lm-dot { fill: var(--accent); } .lm-line { stroke: var(--ink); stroke-width: 1.8; stroke-linecap: round; fill: none; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav ul { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; }
.site-nav a:not(.btn) { display: inline-flex; align-items: center; min-height: 40px; padding: 0 10px; color: var(--ink-2); text-decoration: none; border-radius: 8px; font-size: 15px; }
.site-nav a:not(.btn):hover, .site-nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.nav-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); background: var(--bg); border-radius: 10px; cursor: pointer; position: relative; }
.bars, .bars::before, .bars::after { position: absolute; left: 12px; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; content: ""; transition: transform .2s, top .2s, opacity .2s; }
.bars { top: 21px; } .bars::before { top: -6px; left: 0; } .bars::after { top: 6px; left: 0; }
.nav-open .bars { background: transparent; } .nav-open .bars::before { top: 0; transform: rotate(45deg); } .nav-open .bars::after { top: 0; transform: rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .site-nav { position: fixed; inset: 66px 0 auto 0; background: var(--bg); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; padding: 12px 20px 20px; gap: 12px; box-shadow: var(--shadow); display: none; max-height: calc(100vh - 66px); overflow-y: auto; }
  .nav-open .site-nav { display: flex; }
  .site-nav ul { flex-direction: column; gap: 2px; }
  .site-nav a:not(.btn) { min-height: 46px; font-size: 16px; }
  .site-nav .btn { min-height: 46px; }
  body.nav-open { overflow: hidden; }
}

main { padding-bottom: 56px; }
section { margin-top: 64px; }

/* 首页主视觉 */
.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; margin-top: 56px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero-actions, .cta-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.answer-demo { margin: 0; background: var(--bg-2); border: 1px solid var(--line); border-radius: 20px; padding: 20px; box-shadow: var(--shadow); font-size: 15px; }
.answer-demo .who { display: inline-block; font-size: 12px; font-weight: 700; color: var(--muted); letter-spacing: .08em; margin-right: 8px; }
.answer-demo .q { background: var(--bg); border: 1px solid var(--line); border-radius: 14px 14px 4px 14px; padding: 12px 14px; margin-bottom: 14px; }
.answer-demo .a { background: var(--bg); border: 1px solid var(--line); border-radius: 14px 14px 14px 4px; padding: 12px 14px; }
.answer-demo .a p { margin: .35em 0; }
.answer-demo mark { background: var(--mark); color: inherit; padding: 0 4px; border-radius: 4px; font-weight: 700; }
.answer-demo sup { color: var(--accent); font-weight: 700; }
.sources { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.src { font-size: 13px; padding: 2px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.src.hl { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.answer-demo figcaption { font-size: 13px; color: var(--muted); margin-top: 12px; }

/* 区块与卡片 */
.band { background: var(--bg-2); border-radius: 24px; padding: 40px 32px; }
.band > h2:first-child { margin-top: 0; }
.grid2, .grid3 { display: grid; gap: 20px; margin-top: 24px; }
.grid2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; min-width: 0; }
.card p:last-child { margin-bottom: 0; }
.card.link { display: block; text-decoration: none; color: inherit; transition: border-color .15s, transform .15s; }
.card.link:hover { border-color: var(--accent); transform: translateY(-2px); }
.num { display: inline-block; font-weight: 800; color: var(--accent); font-size: 14px; letter-spacing: .08em; margin-bottom: 6px; }
.chips { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { border: 1px solid var(--line); background: var(--bg); border-radius: 999px; padding: 4px 14px; font-size: 15px; }
.engines { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 20px; }
.engines h3 { font-size: 15px; color: var(--muted); }
.ticks, .crosses { list-style: none; padding: 0; margin: 0; }
.ticks li, .crosses li { position: relative; padding-left: 28px; margin: .5em 0; }
.ticks li::before, .crosses li::before { position: absolute; left: 0; top: .1em; font-weight: 800; }
.ticks li::before { content: "✓"; color: var(--ok); }
.crosses li::before { content: "✕"; color: var(--bad); }
.principles .yes { border-top: 3px solid var(--ok); }
.principles .no { border-top: 3px solid var(--bad); }

.cta { display: flex; align-items: center; justify-content: space-between; gap: 24px; background: var(--ink); color: var(--bg); border-radius: 24px; padding: 36px; }
.cta h2 { margin-top: 0; color: var(--bg); }
.cta p { color: color-mix(in srgb, var(--bg) 80%, transparent); margin: 0; }
.cta .btn.ghost { background: transparent; color: var(--bg); border-color: color-mix(in srgb, var(--bg) 40%, transparent); }
.cta .btn.primary { background: var(--accent); }
.cta-actions { flex: none; margin-top: 0; }

/* 内页 */
.page-head { margin-top: 48px; max-width: 760px; }
.prose { max-width: 760px; margin-top: 48px; }
.prose.narrow { margin-top: 56px; }
.prose li { margin: .35em 0; }
.table-wrap { overflow-x: auto; margin: 1em 0 1.4em; border: 1px solid var(--line); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--bg-2); }
tbody tr:last-child > * { border-bottom: 0; }
tbody th { white-space: nowrap; color: var(--ink-2); }

.svc { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 32px; border-top: 1px solid var(--line); padding-top: 32px; margin-top: 40px; }
.svc h2 { margin-top: 0; }
.svc-head { position: sticky; top: 90px; align-self: start; }
.svc-body h3 { margin-top: 1.2em; }

.steps { list-style: none; padding: 0; margin: 40px 0 0; max-width: 820px; }
.steps > li { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 20px; padding-bottom: 28px; position: relative; }
.steps > li:not(:last-child)::after { content: ""; position: absolute; left: 23px; top: 52px; bottom: 4px; width: 2px; background: var(--line); }
.step-n { width: 48px; height: 48px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 800; font-size: 20px; display: flex; align-items: center; justify-content: center; }
.steps h2 { margin-top: 8px; font-size: 22px; }

.faq-list { max-width: 820px; margin-top: 32px; }
.qa { border: 1px solid var(--line); border-radius: 12px; margin-bottom: 12px; background: var(--bg); }
.qa summary { cursor: pointer; padding: 16px 48px 16px 20px; list-style: none; position: relative; min-height: 44px; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); font-size: 22px; color: var(--accent); }
.qa[open] summary::after { content: "−"; }
.qa summary h2 { font-size: 17px; margin: 0; display: inline; }
.qa p { padding: 0 20px 16px; margin: 0; color: var(--ink-2); }

/* 表单 */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 32px; margin-top: 32px; align-items: start; }
.form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 20px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field.full { grid-column: 1 / -1; }
.field label { font-weight: 600; font-size: 15px; }
.req { color: var(--bad); }
input, select, textarea { font: inherit; font-size: 16px; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-height: 46px; width: 100%; min-width: 0; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
textarea { resize: vertical; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.fine { font-size: 14px; color: var(--muted); margin: 0 0 12px; }
.form-status { display: inline-block; margin-left: 12px; font-size: 15px; }
.form-status.ok { color: var(--ok); } .form-status.err { color: var(--bad); }
.aside h2 { margin-top: 0; font-size: 20px; }
.aside ol { padding-left: 1.2em; }

/* 自检 */
.check-form { display: flex; gap: 12px; margin-top: 24px; max-width: 760px; }
.check-form input { flex: 1; }
.check-status { min-height: 1.6em; margin-top: 12px; color: var(--muted); }
.check-status.err { color: var(--bad); }
.check-result { margin-top: 12px; max-width: 980px; }
.sum { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0 20px; }
.pill { border-radius: 999px; padding: 4px 14px; font-size: 14px; font-weight: 600; }
.st-ok { background: var(--ok-bg); color: var(--ok); } .st-warn { background: var(--warn-bg); color: var(--warn); } .st-bad { background: var(--bad-bg); color: var(--bad); } .st-info { background: var(--bg-3); color: var(--ink-2); }
.res-group { margin-top: 28px; }
.res-group h2 { font-size: 20px; margin: 0 0 10px; }
.res-item { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 14px; padding: 14px 0; border-top: 1px solid var(--line); }
.res-item .pill { justify-self: start; align-self: start; text-align: center; min-width: 64px; }
.res-item h3 { font-size: 16px; margin: 0 0 2px; }
.res-item p { margin: 0; font-size: 15px; overflow-wrap: anywhere; }
.res-item .adv { color: var(--ink-2); margin-top: 4px; }
.bots { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.bot { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; min-width: 0; }
.bot-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.bot b { overflow-wrap: anywhere; }
.bot p { margin: 4px 0 0; font-size: 14px; color: var(--muted); overflow-wrap: anywhere; }
.res-foot { margin-top: 24px; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); padding: 40px 0 28px; margin-top: 40px; }
.ftr { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 24px 40px; }
.ftr-brand p { color: var(--muted); font-size: 15px; margin-top: 10px; }
.ftr-links ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 16px; }
.ftr-links a { display: inline-flex; align-items: center; min-height: 40px; color: var(--ink-2); text-decoration: none; font-size: 15px; }
.ftr-links a:hover { color: var(--accent); }
.ftr-note, .ftr-copy { grid-column: 1 / -1; font-size: 13px; color: var(--muted); margin: 0; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 32px; margin-top: 36px; }
  .grid3 { grid-template-columns: 1fr; }
  .svc { grid-template-columns: 1fr; gap: 8px; }
  .svc-head { position: static; }
  .contact-grid { grid-template-columns: 1fr; }
  .cta { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  section { margin-top: 48px; }
  .grid2, .engines { grid-template-columns: 1fr; }
  .form { grid-template-columns: 1fr; }
  .band { padding: 28px 18px; border-radius: 18px; }
  .cta { padding: 28px 20px; border-radius: 18px; }
  .lead { font-size: 17px; }
  .check-form { flex-direction: column; }
  .res-item { grid-template-columns: 1fr; gap: 6px; }
  .ftr { grid-template-columns: 1fr; }
  .ftr-links ul { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .answer-demo { padding: 14px; }
  .hero-actions .btn, .cta-actions .btn { flex: 1 1 auto; }
}
.res-sub { margin: 22px 0 10px; font-size: 16px; }