:root{
  --bg:#f1f3f6; --surface:#ffffff; --surface-2:#f7f8fa; --border:#dde1e7;
  --fg:#1c2230; --fg-muted:#5b6475; --fg-faint:#8891a1;
  --ink:#2a4d8f; --ink-soft:#eaf0fb; --ink-strong:#1d3766;
  --green:#2f7d5c; --green-soft:#e8f5ef;
  --amber:#a66a1f; --amber-soft:#fbf1e2;
  --red:#b4432f; --red-soft:#fbeae6;
  font-family:'PingFang SC','Microsoft YaHei',-apple-system,BlinkMacSystemFont,sans-serif;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);line-height:1.6}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
a{color:var(--ink)}

.site-header{border-bottom:1px solid var(--border);background:var(--surface);padding:20px 0}
.site-header .wrap{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.brand{font-size:1.4rem;font-weight:700;color:var(--ink-strong)}
.tagline{color:var(--fg-muted);font-size:.88rem}

.hero{padding:40px 0 24px;text-align:center}
.hero h1{font-size:1.7rem;margin:0 0 10px}
.hero .lede{color:var(--fg-muted);max-width:52ch;margin:0 auto}

.upload-panel{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px;margin-bottom:32px}
.strength-row{display:flex;align-items:center;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.strength-label{color:var(--fg-muted);font-size:.9rem}
.strength-options{display:flex;gap:8px}
.strength-btn{border:1px solid var(--border);background:var(--surface-2);color:var(--fg);padding:6px 16px;border-radius:999px;font-size:.88rem;cursor:pointer}
.strength-btn.active{background:var(--ink);border-color:var(--ink);color:#fff}

.dropzone{border:2px dashed var(--border);border-radius:12px;padding:40px 20px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s}
.dropzone:hover,.dropzone.dragover{border-color:var(--ink);background:var(--ink-soft)}
.dropzone-icon{font-size:2rem;color:var(--ink);line-height:1}
.dropzone-text{margin-top:10px;font-size:1rem}
.dropzone-sub{margin-top:6px;color:var(--fg-faint);font-size:.82rem}

.results{margin-bottom:60px}
.results-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:10px;flex-wrap:wrap}
.results-head h2{font-size:1.15rem;margin:0}
.results-head-actions{display:flex;gap:8px;flex-wrap:wrap}
.btn-ghost{border:1px solid var(--border);background:var(--surface);color:var(--fg);padding:6px 14px;border-radius:8px;font-size:.85rem;cursor:pointer}
.btn-ghost:disabled{opacity:.5;cursor:not-allowed}

.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.result-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden;display:flex;flex-direction:column}
.result-thumb{aspect-ratio:3/4;background:var(--surface-2);display:flex;align-items:center;justify-content:center;overflow:hidden}
.result-thumb img{width:100%;height:100%;object-fit:contain}
.result-body{padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.result-filename{font-size:.82rem;color:var(--fg-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.result-status{font-size:.84rem;display:flex;align-items:center;gap:6px}
.status-dot{width:8px;height:8px;border-radius:50%;background:var(--fg-faint);flex:none}
.status-dot.processing{background:var(--amber);animation:pulse 1.2s infinite}
.status-dot.completed{background:var(--green)}
.status-dot.failed{background:var(--red)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.result-actions{display:flex;gap:8px;flex-wrap:wrap}
.btn-sm{border:none;border-radius:7px;padding:6px 12px;font-size:.82rem;cursor:pointer;text-decoration:none;display:inline-block}
.btn-primary{background:var(--ink);color:#fff}
.btn-secondary{background:var(--amber-soft);color:var(--amber)}
.btn-sm.btn-ghost{border:1px solid var(--border);background:var(--surface-2);color:var(--fg-muted)}
.result-error{color:var(--red);font-size:.8rem}

.review-widget{display:flex;align-items:center;gap:8px;padding-top:4px;border-top:1px solid var(--border)}
.review-label{font-size:.78rem;color:var(--fg-faint)}
.review-stars{display:flex;gap:2px}
.review-star{border:none;background:none;color:var(--fg-faint);font-size:1.1rem;line-height:1;cursor:pointer;padding:2px}
.review-star:hover{color:var(--amber)}

.site-footer{border-top:1px solid var(--border);margin-top:40px;padding:20px 0;color:var(--fg-faint);font-size:.8rem;text-align:center}
.site-footer a{color:var(--fg-muted)}

/* 顶部导航（内容页：关于/常见问题/联系我们，和首页共用同一个site-header外壳） */
.site-header nav a{color:var(--fg-muted);text-decoration:none}
.site-header nav a:hover,.site-header nav a.nav-active{color:var(--ink)}

/* 内容页（about/faq/contact） */
.content-hero{padding:24px 0 20px;border-bottom:1px solid var(--border);margin-bottom:28px}
.content-hero h1{font-size:1.6rem;margin:0 0 8px}
.content-hero .lede{color:var(--fg-muted);margin:0;max-width:60ch}
.content-section{margin-bottom:36px}
.content-section h2{font-size:1.15rem;margin:0 0 12px}
.content-section p{color:var(--fg-muted);margin:0 0 12px}
.content-section p:last-child{margin-bottom:0}
.content-section b{color:var(--fg)}

.faq-list{display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:16px 18px}
.faq-question{font-weight:600;margin-bottom:6px}
.faq-answer{color:var(--fg-muted);font-size:.92rem;line-height:1.65}
.faq-answer a{color:var(--ink)}

.alert{padding:12px 16px;border-radius:8px;margin-bottom:18px;font-size:.9rem}
.alert-success{background:var(--green-soft);color:var(--green)}
.alert-error{background:var(--red-soft);color:var(--red)}

.contact-form{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:22px;position:relative}
.form-group{margin-bottom:16px}
.form-label{display:block;margin-bottom:6px;font-weight:600;font-size:.88rem;color:var(--fg)}
.form-input,.form-select{width:100%;border:1px solid var(--border);background:var(--surface-2);color:var(--fg);padding:10px 12px;border-radius:8px;font-size:.92rem;font-family:inherit}
.form-textarea{resize:vertical}

@media (max-width:480px){
  .hero h1{font-size:1.4rem}
  .upload-panel{padding:16px}
  .content-hero h1{font-size:1.35rem}
}