:root{--ink:#18202a;--muted:#5c6773;--line:#e1e5ea;--acc:#4338ca;--bg:#f8f9fb}*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}a{color:var(--acc)}
.wrap{max-width:820px;margin:0 auto;padding:0 18px}header{background:#fff;border-bottom:1px solid var(--line)}.bar{display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;align-items:center;padding:12px 18px}.brand{display:flex;gap:8px;align-items:center;font-weight:700;font-size:19px;color:var(--ink);text-decoration:none}nav{display:flex;flex-wrap:wrap;gap:14px;font-size:15px}nav a{color:var(--muted);text-decoration:none}
h1{font-size:32px;margin:26px 0 6px}.lead{font-size:18px;color:var(--muted)}.small{font-size:14px;color:var(--muted)}
.tool{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin:18px 0}.drop{border:2px dashed #c7cbe8;border-radius:12px;text-align:center;padding:18px}.drop.on{background:#eef0ff;border-color:var(--acc)}
.btn,button{display:inline-block;font:inherit;background:var(--acc);color:#fff;border:0;border-radius:8px;padding:9px 16px;cursor:pointer}button.ghost{background:#fff;color:var(--acc);border:1px solid var(--acc)}
fieldset{border:1px solid var(--line);border-radius:10px;margin:12px 0}fieldset label{display:block;padding:3px 0}.modebox{background:#f6f7fb;border-radius:10px;padding:10px 14px;margin:10px 0}.modebox label{display:block;margin:6px 0}
input[type=number]{width:80px}input,select{font:inherit;padding:5px 8px;border:1px solid #c9ced6;border-radius:7px}
table{width:100%;border-collapse:collapse;font-size:14px;margin:10px 0}th,td{border:1px solid var(--line);padding:6px 8px;text-align:left}th{background:#f1f3f7}
footer{margin-top:40px;border-top:1px solid var(--line);background:#fff;padding:14px 0;font-size:14px;color:var(--muted)}