:root { --ink:#1f2937; --muted:#6b7280; --line:#e5e7eb; --brand:#1e40af; --brand-d:#1e3a8a; --warn:#b45309; --warnbg:#fffbeb; }
* { box-sizing: border-box; }
body { margin:0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color:var(--ink); background:#f3f4f6; line-height:1.5; }
.wrap { max-width:720px; margin:0 auto; padding:24px 16px 48px; }
.head { text-align:center; margin-bottom:20px; }
.logo { font-size:26px; font-weight:800; letter-spacing:.3px; }
.tag { color:var(--muted); margin:6px 0 0; font-size:14px; }
.card { background:#fff; border:1px solid var(--line); border-radius:14px; padding:18px; box-shadow:0 1px 2px rgba(0,0,0,.04); }
.dropzone { border:2px dashed var(--line); border-radius:12px; padding:22px 16px; text-align:center; display:flex; flex-direction:column; gap:8px; align-items:center; transition:.15s; }
.dropzone.over { border-color:var(--brand); background:#eff6ff; }
.dropzone strong { font-size:15px; }
.muted { color:var(--muted); font-size:13px; }
.or { text-align:center; color:var(--muted); font-size:13px; margin:14px 0; }
textarea { width:100%; border:1px solid var(--line); border-radius:10px; padding:12px; font:inherit; resize:vertical; }
button { font:inherit; cursor:pointer; border-radius:10px; border:1px solid transparent; }
.primary { background:var(--brand); color:#fff; font-weight:700; padding:12px 18px; width:100%; margin-top:14px; }
.primary:hover { background:var(--brand-d); }
.primary:disabled { opacity:.6; cursor:progress; }
.ghost { background:#fff; border-color:var(--line); color:var(--brand); padding:8px 14px; margin-top:4px; }
.hint { color:var(--muted); font-size:12px; text-align:center; margin:12px 0 0; }
.result { margin-top:18px; background:#fff; border:1px solid var(--line); border-left:4px solid var(--brand); border-radius:12px; padding:16px; white-space:pre-wrap; word-wrap:break-word; font-size:14px; }
.result.limited { border-left-color:var(--warn); background:var(--warnbg); }
.hidden { display:none; }
.foot { text-align:center; color:var(--muted); font-size:12px; margin-top:24px; }