:root{
  --bg:#f3f5f8;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:#e5e7eb;
  --accent:#0f62fe;
  --accent-2:#111827;
  --success:#10b981;
  --shadow:0 12px 36px rgba(17,24,39,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,Arial,"Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#eef2f7 0,#f8fafc 100%);color:var(--text)}
.shell{max-width:1460px;margin:0 auto;padding:24px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:14px}
.brand-mark{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,#111827,#2b6fff);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:24px;box-shadow:var(--shadow)}
.brand h1{font-size:24px;line-height:1.2;margin:0}
.brand p{margin:4px 0 0;color:var(--muted)}
.meta-pill{padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:999px;color:#374151;box-shadow:var(--shadow);font-size:14px}
.workspace{display:grid;grid-template-columns:320px minmax(560px,1fr) 300px;gap:18px;align-items:start}
.card{background:var(--card);border:1px solid rgba(229,231,235,.9);border-radius:22px;box-shadow:var(--shadow)}
.left-panel,.right-panel{padding:20px}
.center-panel{display:flex;flex-direction:column;gap:16px}
h2{margin:0 0 14px;font-size:18px}.tips{margin:0 0 18px;padding-left:20px;color:#4b5563}.tips li{margin:8px 0}
.dropzone{border:2px dashed #c9d4e5;border-radius:20px;padding:16px;background:#f8fbff;transition:.2s;margin-bottom:16px;cursor:pointer}
.dropzone:hover,.dropzone.dragover{border-color:var(--accent);background:#eef5ff}
.dropzone-inner{text-align:center;padding:18px 10px}.upload-icon{width:56px;height:56px;border-radius:18px;background:#dbeafe;color:#2563eb;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;margin:0 auto 12px}
.dropzone h3{margin:0 0 8px;font-size:18px}.dropzone p{margin:0 0 14px;color:var(--muted)}
.control-group{margin-bottom:14px}.control-group label{display:block;font-size:14px;font-weight:600;margin-bottom:8px}.control-group select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:14px}
.actions{display:flex;gap:12px;flex-wrap:wrap}.actions.vertical{flex-direction:column}
.btn{appearance:none;border:none;border-radius:14px;padding:13px 16px;font-size:15px;font-weight:700;cursor:pointer;background:#eef2f7;color:#111827;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;transition:.2s}
.btn:hover{transform:translateY(-1px)}
.btn:disabled,.btn.disabled{opacity:.48;pointer-events:none}
.btn-primary{background:var(--accent);color:#fff}.btn-accent{background:#111827;color:#fff}.btn-light{background:#f3f4f6;color:#111827}
.status-bar{display:flex;align-items:center;gap:14px;padding:16px 18px}.status-dot{width:14px;height:14px;border-radius:50%;background:#d1d5db;flex:none}.status-dot.active{background:var(--accent)}.status-dot.success{background:var(--success)}.status-bar p{margin:3px 0 0;color:var(--muted)}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.image-card{overflow:hidden}.card-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--line)}.card-head small{color:var(--muted)}
.image-stage{position:relative;min-height:540px;display:flex;align-items:center;justify-content:center;padding:18px}
.image-stage img{max-width:100%;max-height:500px;border-radius:16px;box-shadow:0 8px 24px rgba(0,0,0,.08)}
.checker{background-image:linear-gradient(45deg,#f0f2f5 25%,transparent 25%),linear-gradient(-45deg,#f0f2f5 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#f0f2f5 75%),linear-gradient(-45deg,transparent 75%,#f0f2f5 75%);background-size:22px 22px;background-position:0 0,0 11px,11px -11px,-11px 0}
.placeholder{color:#94a3b8;font-size:16px;text-align:center}
.loading{position:absolute;inset:0;background:rgba(255,255,255,.82);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;border-radius:0}.spinner{width:56px;height:56px;border:6px solid #dbeafe;border-top-color:#2563eb;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.info-list{margin:0 0 18px}.info-list div{padding:12px 0;border-bottom:1px solid var(--line)}.info-list dt{font-size:12px;text-transform:uppercase;color:#9ca3af;letter-spacing:.04em;margin-bottom:4px}.info-list dd{margin:0;color:#111827;font-weight:600}
.result-actions{margin-bottom:18px}.note-block{padding:16px;border-radius:16px;background:#f8fafc;border:1px solid var(--line)}.note-block h3{margin:0 0 10px;font-size:16px}.note-block p{margin:0;color:#4b5563;line-height:1.6}
@media (max-width:1200px){.workspace{grid-template-columns:1fr}.compare-grid{grid-template-columns:1fr}.image-stage{min-height:420px}.left-panel,.right-panel{order:2}.center-panel{order:1}}