/* em-landing · 单页落地主题
 * 可覆盖一等 token:--fg / --accent / --bg / --card + body font-family
 */
:root {
  --fg: #0f172a;
  --accent: #7c3aed;
  --bg: #ffffff;
  --card: #ffffff;
  --muted: #64748b;
  --line: #e2e8f0;
  --surface: #f8fafc;
  --ink: #0f172a;
  --maxw: 70rem;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.05);
  --shadow: 0 8px 24px rgba(15,23,42,.08);
  --shadow-lg: 0 24px 48px rgba(15,23,42,.14);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root { --fg:#e6edf3; --muted:#9198a1; --line:#30363d; --surface:#161b22; --ink:#e6edf3; --bg:#0d1117; --card:#161b22; --accent:#a78bfa; --shadow:0 8px 24px rgba(0,0,0,.4); --shadow-lg:0 24px 48px rgba(0,0,0,.5); }
}
* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:5rem; }
body { margin:0; font-family:var(--font-sans); color:var(--fg); background:var(--bg); line-height:1.65; font-size:16px; -webkit-font-smoothing:antialiased; }
img,video { max-width:100%; height:auto; }
a { color:var(--accent); text-decoration:none; }
a:hover { text-decoration:underline; }
h1,h2,h3 { letter-spacing:-.02em; line-height:1.2; color:var(--ink); }
.wrap { max-width:var(--maxw); margin:0 auto; padding:0 1.5rem; }
.narrow { max-width:46rem; margin:0 auto; }
.skip-link { position:absolute; left:-9999px; top:0; background:var(--accent); color:#fff; padding:.5rem 1rem; z-index:100; }
.skip-link:focus { left:1rem; top:1rem; }

/* buttons */
.btn { display:inline-block; padding:.6rem 1.1rem; border-radius:var(--radius-sm); font-weight:600; font-size:.95rem; border:1px solid var(--line); background:var(--card); color:var(--ink); cursor:pointer; transition:transform .12s, filter .12s, box-shadow .12s; }
.btn:hover { text-decoration:none; transform:translateY(-1px); }
.btn-lg { padding:.85rem 1.7rem; font-size:1.02rem; }
.btn-block { display:block; width:100%; text-align:center; }
.btn-primary { background:var(--accent); border-color:var(--accent); color:#fff; box-shadow:var(--shadow-sm); }
.btn-primary:hover { color:#fff; filter:brightness(1.08); box-shadow:var(--shadow); }
.btn-ghost { background:transparent; border-color:var(--line); color:var(--ink); }
.btn-ghost:hover { background:var(--surface); }
.btn-light { background:#fff; border-color:#fff; color:var(--accent); }
.btn-light:hover { color:var(--accent); filter:brightness(.95); }

/* header */
.site-header { position:sticky; top:0; z-index:40; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter:blur(12px); border-bottom:1px solid var(--line); }
.site-header-inner { display:flex; align-items:center; gap:1rem; min-height:4rem; }
.brand { display:inline-flex; align-items:center; gap:.5rem; font-weight:700; font-size:1.1rem; color:var(--ink); margin-right:auto; }
.brand:hover { text-decoration:none; }
.brand-logo { height:1.7rem; }
.nav-toggle { position:relative; }
.nav-toggle > summary { list-style:none; cursor:pointer; display:inline-flex; align-items:center; justify-content:center; width:2.4rem; height:2.4rem; border-radius:var(--radius-sm); border:1px solid var(--line); background:var(--card); }
.nav-toggle > summary::-webkit-details-marker { display:none; }
.burger, .burger::before, .burger::after { display:block; width:16px; height:2px; background:var(--ink); position:relative; }
.burger::before, .burger::after { content:""; position:absolute; left:0; } .burger::before{top:-5px} .burger::after{top:5px}
.site-nav { display:flex; align-items:center; gap:.4rem 1.1rem; flex-wrap:wrap; }
.site-nav a { color:var(--muted); font-size:.95rem; font-weight:500; padding:.25rem .2rem; }
.site-nav a:hover { color:var(--ink); text-decoration:none; }
.nav-cta { color:#fff; }
.nav-cta:hover { color:#fff; }
.lang-switch { display:inline-flex; gap:.4rem; font-size:.82rem; color:var(--muted); }
.lang-switch strong { color:var(--ink); }
.ems-account { display:inline-flex; }
@media (min-width:760px){ .nav-toggle>summary{display:none} .nav-toggle .site-nav{ position:static; flex-direction:row; background:none; border:0; padding:0; box-shadow:none; } }
@media (max-width:759px){
  .nav-toggle .site-nav{ position:absolute; top:calc(100% + .5rem); right:0; left:0; flex-direction:column; align-items:stretch; gap:.25rem; background:var(--card); border:1px solid var(--line); padding:1rem; border-radius:var(--radius); box-shadow:var(--shadow-lg); display:none; }
  .nav-toggle[open] .site-nav{ display:flex; }
  .site-nav a{ padding:.5rem; }
}

/* hero */
.hero { padding:5.5rem 0 4rem; text-align:center; background:
   radial-gradient(70% 90% at 50% 0%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 70%); }
.hero-inner { max-width:46rem; margin:0 auto; }
.hero-title { font-size:clamp(2.3rem, 6vw, 4rem); margin:0 0 1rem; font-weight:800; }
.hero-subtitle { font-size:clamp(1.1rem, 2.2vw, 1.4rem); color:var(--muted); margin:0 0 2rem; }
.hero-actions { display:flex; gap:.75rem; justify-content:center; flex-wrap:wrap; }

/* logos */
.logos { padding:2rem 0; border-bottom:1px solid var(--line); }
.logos-label { text-align:center; color:var(--muted); font-size:.82rem; text-transform:uppercase; letter-spacing:.08em; margin:0 0 1rem; }
.logos-row { display:flex; flex-wrap:wrap; justify-content:center; gap:2rem; align-items:center; }
.logo-item { color:var(--muted); font-weight:700; font-size:1.1rem; opacity:.7; }

/* sections */
.section { padding:4.5rem 0; }
.section-title { text-align:center; font-size:clamp(1.6rem,3vw,2.1rem); margin:0 0 2.5rem; font-weight:700; }

/* features */
.feature-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(15rem,1fr)); gap:1.5rem; }
.feature-card { padding:1.75rem; border:1px solid var(--line); border-radius:var(--radius); background:var(--card); box-shadow:var(--shadow-sm); transition:transform .15s, box-shadow .15s; }
.feature-card:hover { transform:translateY(-4px); box-shadow:var(--shadow); }
.feature-icon { width:3rem; height:3rem; display:flex; align-items:center; justify-content:center; font-size:1.5rem; border-radius:var(--radius-sm); background: color-mix(in srgb, var(--accent) 14%, transparent); color:var(--accent); margin-bottom:1rem; }
.feature-card h3 { margin:0 0 .5rem; }
.feature-card p { margin:0; color:var(--muted); }

/* pricing */
.pricing { background:var(--surface); }
.pricing-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(16rem,1fr)); gap:1.5rem; align-items:start; }
.plan-card { position:relative; padding:2rem; border:1px solid var(--line); border-radius:var(--radius); background:var(--card); box-shadow:var(--shadow-sm); }
.plan-card.is-featured { border-color:var(--accent); box-shadow:var(--shadow-lg); transform:scale(1.03); }
.plan-flag { position:absolute; top:-.7rem; left:50%; transform:translateX(-50%); background:var(--accent); color:#fff; font-size:.72rem; font-weight:700; padding:.25rem .8rem; border-radius:999px; }
.plan-name { margin:0 0 .6rem; font-size:1.1rem; color:var(--muted); }
.plan-price { display:flex; align-items:baseline; gap:.3rem; margin-bottom:.6rem; }
.plan-amount { font-size:2.4rem; font-weight:800; color:var(--ink); }
.plan-period { color:var(--muted); font-size:.95rem; }
.plan-desc { color:var(--muted); margin:0 0 1.2rem; font-size:.92rem; }
.plan-features { list-style:none; padding:0; margin:0 0 1.5rem; }
.plan-features li { padding:.4rem 0 .4rem 1.5rem; position:relative; color:var(--fg); font-size:.94rem; }
.plan-features li::before { content:"\2713"; position:absolute; left:0; color:var(--accent); font-weight:700; }
.pricing-note { text-align:center; color:var(--muted); font-size:.88rem; margin-top:1.5rem; min-height:1em; }

/* faq */
.faq-item { border-bottom:1px solid var(--line); }
.faq-item summary { cursor:pointer; padding:1.1rem 0; font-weight:600; font-size:1.05rem; list-style:none; display:flex; justify-content:space-between; align-items:center; color:var(--ink); }
.faq-item summary::-webkit-details-marker { display:none; }
.faq-item summary::after { content:"+"; color:var(--accent); font-size:1.4rem; font-weight:400; transition:transform .2s; }
.faq-item[open] summary::after { transform:rotate(45deg); }
.faq-a { padding:0 0 1.1rem; color:var(--muted); }

/* cta band */
.cta-band { background:var(--accent); color:#fff; padding:4.5rem 0; text-align:center; }
.cta-title { color:#fff; font-size:clamp(1.7rem,3vw,2.2rem); margin:0 0 .6rem; }
.cta-text { color: color-mix(in srgb, #fff 85%, transparent); margin:0 0 1.5rem; font-size:1.05rem; }

/* prose */
.prose { font-size:1.05rem; }
.prose h2 { font-size:1.6rem; margin:2rem 0 .7rem; }
.prose h3 { font-size:1.2rem; margin:1.5rem 0 .5rem; }
.prose p { margin:0 0 1.1rem; }
.prose ul, .prose ol { padding-left:1.4rem; margin:0 0 1.1rem; }
.prose blockquote { margin:1.3rem 0; padding:.6rem 1.2rem; border-left:3px solid var(--accent); background:var(--surface); color:var(--muted); border-radius:0 var(--radius-sm) var(--radius-sm) 0; }
.prose pre { background:#0f172a; color:#e2e8f0; border-radius:var(--radius-sm); padding:1rem; overflow-x:auto; font-family:var(--font-mono); font-size:.88rem; }
.prose code { font-family:var(--font-mono); }
.prose :not(pre)>code { background:var(--surface); padding:.12rem .35rem; border-radius:4px; font-size:.88em; }
.prose a { text-decoration:underline; text-underline-offset:2px; }

/* simple list (fallback section) */
.simple-list { list-style:none; padding:0; margin:1.5rem 0 0; }
.simple-list li { padding:.5rem 0; border-bottom:1px solid var(--line); }

/* 404 */
.not-found { text-align:center; padding:4rem 0; }
.not-found-code { font-size:5rem; font-weight:800; color:var(--accent); margin:0; line-height:1; }

/* footer */
.site-footer { background:var(--surface); border-top:1px solid var(--line); }
.site-footer-inner { padding:3rem 1.5rem 2rem; display:grid; grid-template-columns:1fr auto; gap:2rem; align-items:start; }
.footer-brand { display:flex; flex-direction:column; gap:.5rem; }
.footer-name { font-weight:700; color:var(--ink); display:inline-flex; align-items:center; gap:.5rem; }
.footer-logo { height:1.4rem; }
.footer-text { margin:0; color:var(--muted); font-size:.92rem; max-width:28rem; }
.footer-nav { display:flex; flex-direction:column; gap:.5rem; }
.footer-nav a { color:var(--muted); font-size:.92rem; }
.footer-nav a:hover { color:var(--ink); }
.footer-meta { grid-column:1/-1; color:var(--muted); font-size:.82rem; margin:0; padding-top:1.5rem; border-top:1px solid var(--line); }
@media (max-width:600px){ .site-footer-inner{ grid-template-columns:1fr; } .plan-card.is-featured{ transform:none; } }