:root{color-scheme:light;--bg: #f4f6f3;--panel: #ffffff;--ink: #17201c;--muted: #66736d;--line: #d7ddd8;--accent: #0f766e;--accent-strong: #115e59;--soft: #e8f3ef}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Segoe UI,Microsoft YaHei,Arial,sans-serif}.workspace{width:min(1180px,calc(100vw - 32px));margin:24px auto}.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:20px}.intro{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:16px}.eyebrow{margin:0 0 6px;color:var(--accent-strong);font-size:13px;font-weight:700;text-transform:uppercase}h1,h2,p{margin-top:0}h1{margin-bottom:8px;font-size:32px}h2{margin-bottom:14px;font-size:18px}.muted,.hint{color:var(--muted)}.hint{margin:12px 0 0;font-size:14px}.tool{display:grid;grid-template-columns:1fr 2fr 1fr;gap:16px;align-items:start}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}label{display:grid;gap:6px;color:#2e3b35;font-size:14px;font-weight:600}input,select{width:100%;min-height:40px;border:1px solid var(--line);border-radius:6px;padding:8px 10px;background:#fff;color:var(--ink);font:inherit}.file-drop{min-height:150px;place-items:center;border:1px dashed #9ab0a7;border-radius:8px;background:var(--soft);text-align:center;cursor:pointer}.file-drop input{width:min(260px,100%)}button,.secondary,.card-head a{display:inline-flex;align-items:center;justify-content:center;min-height:40px;border-radius:6px;padding:8px 14px;border:1px solid var(--accent);background:var(--accent);color:#fff;font-weight:700;text-decoration:none;cursor:pointer}.secondary,.card-head a{background:#fff;color:var(--accent-strong)}.specs,.summary{display:grid;grid-template-columns:repeat(3,max-content);gap:10px 18px;margin:0}.summary{grid-template-columns:repeat(6,minmax(90px,1fr))}dt{color:var(--muted);font-size:12px}dd{margin:2px 0 0;font-weight:700}.preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-bottom:16px}.preview-card img{display:block;width:100%;max-height:62vh;object-fit:contain;border:1px solid var(--line);border-radius:6px;background:repeating-linear-gradient(45deg,#f7f7f7 0 8px,#ecefed 8px 16px)}.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.card-head h2{margin-bottom:0}@media (max-width: 900px){.intro,.card-head{align-items:stretch;flex-direction:column}.tool,.preview-grid,.grid,.specs,.summary{grid-template-columns:1fr}}.warning{margin:8px 0 0;padding:10px 12px;border:1px solid #ddb777;background:#fff8e6;border-radius:6px;color:#5b3f10;font-size:13px}.error{margin:8px 0 0;padding:10px 12px;border:1px solid #d99898;background:#fcebeb;border-radius:6px;color:#6c1f1f;font-size:13px}button[disabled]{opacity:.55;cursor:progress}.status{margin:12px 0 0;font-size:13px;color:var(--muted)}.hidden{display:none!important}.lang-toggle{position:fixed;top:12px;right:12px;display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--panel);z-index:10;box-shadow:0 1px 2px #0000000a}.lang-btn{min-height:32px;min-width:36px;padding:4px 10px;border:none;background:transparent;color:var(--ink);font-weight:600;font-size:13px;cursor:pointer;border-radius:0}.lang-btn+.lang-btn{border-left:1px solid var(--line)}.lang-btn.active{background:var(--accent);color:#fff}