:root{--bg:#f6f7f9;--card:#fff;--fg:#15181d;--mute:#6a7280;--line:#dfe3e8;--accent:#2f5bea;--accent-fg:#fff;--bad:#c62828;--ok:#1b7f3b}
@media (prefers-color-scheme:dark){:root{--bg:#0f1115;--card:#171a20;--fg:#e8eaee;--mute:#9099a8;--line:#2a2f38;--accent:#6b8cff;--accent-fg:#0b0d12;--bad:#ff7b7b;--ok:#55d17f}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 -apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif}
main{max-width:560px;margin:0 auto;padding:28px 16px 48px}
h1{margin:0;font-size:28px;letter-spacing:.5px}h1 span{color:var(--accent);font-weight:600}
header p{color:var(--mute);margin:6px 0 20px}
.tabs{display:flex;gap:4px;background:var(--line);padding:4px;border-radius:12px;margin-bottom:14px}
.tab{flex:1;border:0;background:transparent;color:var(--mute);padding:10px;border-radius:9px;font:inherit;cursor:pointer}
.tab.active{background:var(--card);color:var(--fg);font-weight:600;box-shadow:0 1px 3px #0002}
.panel{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;display:flex;flex-direction:column;gap:16px}
.panel[hidden]{display:none}
.drop{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center;padding:30px 14px;border:2px dashed var(--line);border-radius:12px;cursor:pointer;transition:.15s;word-break:break-all}
.drop:hover,.drop.over{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 7%,transparent)}
.drop small,.field,small{color:var(--mute);font-size:13px}
.field{display:flex;flex-direction:column;gap:6px}
input[type=password],input[type=text],select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);font:inherit}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px}
.pw{display:flex;gap:8px}
.ghost{border:1px solid var(--line);background:transparent;color:var(--fg);border-radius:10px;padding:0 14px;cursor:pointer;font:inherit}
.meter{height:4px;background:var(--line);border-radius:2px;overflow:hidden}
.meter i{display:block;height:100%;width:0;background:var(--bad);transition:.2s}
details summary{cursor:pointer;color:var(--mute);font-size:14px}
.grid{display:grid;gap:12px;margin-top:12px}
.primary{border:0;background:var(--accent);color:var(--accent-fg);padding:13px;border-radius:11px;font:inherit;font-weight:600;cursor:pointer;text-align:center;text-decoration:none;display:block}
.primary:disabled{opacity:.5;cursor:wait}
#status{min-height:24px;margin:14px 2px 0;font-size:14px;color:var(--mute)}
#status.err{color:var(--bad)}#status.ok{color:var(--ok)}
#result{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:12px;align-items:stretch}
#result[hidden],#preview[hidden]{display:none}
#preview{max-width:100%;max-height:320px;object-fit:contain;border-radius:8px;border:1px solid var(--line);background:repeating-conic-gradient(#8883 0 25%,transparent 0 50%) 0 0/16px 16px;align-self:center}
footer{margin-top:28px;color:var(--mute);font-size:12.5px}