:root{
  --bg:#f4f7fb; --card:#ffffff; --ink:#1f2733; --muted:#5b6b7d; --line:#e3e9f0;
  --brand:#2563eb; --brand-soft:#eaf1fe; --ok:#15803d; --ok-soft:#e8f7ee;
  --warn:#b45309; --warn-soft:#fdf3e3; --danger:#b91c1c; --danger-soft:#fdecec;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7;min-height:100vh;display:flex;flex-direction:column}
header.top{background:var(--card);border-bottom:1px solid var(--line);padding:12px 20px;display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:10}
.brand-logo{width:32px;height:32px;border-radius:9px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;flex:none}
header.top h1{font-size:17px;font-weight:800;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
header.top .top-right{display:flex;align-items:center;gap:10px;flex:none}
header.top a.back{color:var(--brand);text-decoration:none;font-size:14px;font-weight:700}
.lang-switcher{display:inline-flex;gap:2px;align-items:center;font-size:12px}
.lang-switcher .lang-label{color:var(--muted);margin-right:2px}
.lang-switcher .lang-link,.lang-switcher .lang-cur{padding:3px 8px;border-radius:999px;text-decoration:none;font-weight:600;font-size:12px;white-space:nowrap}
.lang-switcher .lang-link{background:#eaf1fe;color:#2563eb;border:1px solid #cfd9ec}
.lang-switcher .lang-link:hover{background:#2563eb;color:#fff}
.lang-switcher .lang-cur{background:#2563eb;color:#fff}
@media(max-width:520px){.lang-switcher .lang-label{display:none}.lang-switcher .lang-link,.lang-switcher .lang-cur{padding:2px 6px;font-size:11px}header.top{padding:10px 12px}header.top h1{font-size:15px}}
.wrap{max-width:860px;margin:0 auto;padding:0 20px 40px;width:100%;flex:1}

.hero{background:linear-gradient(135deg,#1e3a8a,#2563eb 60%,#0d9488);border-radius:0 0 24px 24px;color:#fff;padding:34px 20px 30px;text-align:center;margin:-12px -20px 26px}
.hero h2{font-size:24px;font-weight:800;letter-spacing:.5px}
.hero p{font-size:14.5px;opacity:.92;margin-top:8px;max-width:520px;margin-left:auto;margin-right:auto}
.search{max-width:480px;margin:18px auto 0;position:relative}
.search input{width:100%;padding:13px 16px;border:none;border-radius:14px;font-size:15px;outline:none;box-shadow:0 6px 20px rgba(0,0,0,.15)}
.search input::placeholder{color:#9aa7b5}

.section-title{font-size:17px;font-weight:800;margin:30px 0 14px;display:flex;align-items:center;gap:8px}
.section-title .bar{width:4px;height:18px;border-radius:2px;background:var(--brand)}
.section-title small{font-weight:400;color:var(--muted);font-size:12.5px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease;display:block;text-decoration:none;color:inherit}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(31,39,51,.08)}
.card .row{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.logo{width:44px;height:44px;border-radius:12px;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;flex:none}
.card h3{font-size:16px;font-weight:800}
.card p{font-size:12.8px;color:var(--muted)}
.card .models{font-size:11.5px;color:#8b98a8;margin-top:8px}

.detail{max-width:640px;margin:0 auto}
.detail .d-head{display:flex;align-items:center;gap:14px;margin:22px 0 6px}
.detail h2{font-size:21px;font-weight:800}
.detail .d-sub{color:var(--muted);font-size:13.5px;margin-bottom:18px}
.dstep{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin-bottom:14px}
.dstep .num{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:26px;border-radius:8px;background:var(--brand);color:#fff;font-size:13px;font-weight:800;margin-bottom:10px;padding:0 6px}
.dstep h4{font-size:15.5px;font-weight:800;margin-bottom:8px}
.path{background:#f0f4fa;border:1.5px dashed #b8c6d8;border-radius:12px;padding:12px 14px;font-size:14px;font-weight:600;color:#12355e;margin-bottom:8px;line-height:1.9}
.path .arr{color:var(--brand);font-weight:800;padding:0 3px}
.path .tap{display:inline-block;background:var(--brand);color:#fff;padding:1px 10px;border-radius:8px;font-size:13px;font-weight:700}
.hint{font-size:12.8px;color:var(--muted)}
.tip{background:var(--warn-soft);border-left:4px solid var(--warn);border-radius:10px;padding:12px 14px;font-size:13.5px;margin:12px 0}
.tip b{color:#92400e}
.okbox{background:var(--ok-soft);border-left:4px solid var(--ok);border-radius:10px;padding:12px 14px;font-size:13.5px;margin:12px 0}
.okbox b{color:#14603a}
details.faq{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden}
summary{padding:14px 16px;font-weight:700;font-size:14.5px;cursor:pointer;list-style:none;position:relative}
summary::after{content:"＋";position:absolute;right:16px;color:var(--brand);font-weight:800}
details[open] summary::after{content:"－"}
details.faq .body{padding:0 16px 14px;font-size:13.5px;color:#3d4a5a;border-top:1px dashed var(--line);padding-top:10px}

.principle{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin-top:34px}
.principle h3{font-size:15px;font-weight:800;margin-bottom:10px}
.principle ul{list-style:none}
.principle li{padding:5px 0 5px 22px;position:relative;font-size:13.5px;color:#3d4a5a}
.principle li::before{content:"✓";position:absolute;left:2px;color:var(--ok);font-weight:800}
.empty{text-align:center;color:var(--muted);padding:40px 0;font-size:14px}
footer{border-top:1px solid var(--line);background:var(--card);text-align:center;padding:18px;color:#8b98a8;font-size:12.5px}
footer a{color:var(--brand);text-decoration:none}
.btn-primary{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;font-weight:700;font-size:14.5px;padding:12px 22px;border-radius:13px;margin-top:6px;border:none;cursor:pointer}
form.feedback{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;margin-top:16px}
form.feedback label{display:block;font-size:13px;font-weight:700;color:var(--ink);margin:14px 0 6px}
form.feedback label:first-child{margin-top:0}
form.feedback label .req{color:var(--danger)}
form.feedback select,form.feedback input[type=text],form.feedback textarea{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:11px;font-size:14.5px;font-family:inherit;background:#fff;color:var(--ink);outline:none}
form.feedback select:focus,form.feedback input[type=text]:focus,form.feedback textarea:focus{border-color:var(--brand)}
form.feedback textarea{min-height:96px;resize:vertical}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips label{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:400;margin:0;padding:7px 12px;border:1.5px solid var(--line);border-radius:999px;cursor:pointer;user-select:none}
.chips input{accent-color:var(--brand);width:15px;height:15px}
.chips label:has(input:checked){background:var(--brand-soft);border-color:var(--brand);color:var(--brand);font-weight:700}
.fb-result{display:none;background:var(--ok-soft);border-left:4px solid var(--ok);border-radius:10px;padding:12px 14px;font-size:13.5px;margin-top:14px}
.fb-result.show{display:block}
.fb-result textarea{width:100%;margin-top:8px;padding:10px;border:1px solid var(--line);border-radius:9px;font-size:12.5px;min-height:70px;font-family:inherit;background:#fff}
.contact-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin-top:16px}
.contact-card h3{font-size:15px;font-weight:800;margin-bottom:8px}
.contact-card p{font-size:13.5px;color:#3d4a5a;margin-bottom:6px}
.feedback-banner{background:var(--brand-soft);border:1px solid var(--brand);border-radius:14px;padding:14px 18px;margin:24px 0 0;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.feedback-banner .fb-text{flex:1;font-size:13.5px;color:#0c447c;min-width:220px}
.feedback-banner .fb-text b{font-weight:800}
@media(max-width:520px){.hero{padding:26px 16px 24px}.hero h2{font-size:20px}}