:root{--bg:#f7f7fb;--card:#fff;--accent:#2b7cff;--muted:#666}
*{box-sizing:border-box;font-family:Segoe UI,system-ui,Arial}
body{margin:0;background:var(--bg);color:#111}
header{padding:28px 20px;background:linear-gradient(90deg,#fff,#f2f6ff);border-bottom:1px solid #e6e9f2}
main{padding:20px}
.file-list{list-style:none;padding:0;margin:0;max-width:720px}
.file-list li{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;margin:8px 0;background:var(--card);border-radius:8px;box-shadow:0 1px 3px rgba(20,30,50,0.04)}
.download-btn{background:var(--accent);color:#fff;border:0;padding:8px 12px;border-radius:6px;cursor:pointer}
.download-btn:hover{filter:brightness(.95)}
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.45);padding:20px}
.modal.hidden{display:none}
.modal-content{width:100%;max-width:480px;background:var(--card);padding:18px;border-radius:10px;position:relative}
.close{position:absolute;right:10px;top:8px;border:0;background:transparent;font-size:18px;cursor:pointer}
.captcha-row{display:flex;gap:8px;align-items:center;margin:8px 0}
#captchaAnswer{padding:6px;border:1px solid #ddd;border-radius:6px;width:80px}
.hint{color:var(--muted);font-size:13px}
.hidden{display:none}
.fallback{display:inline-block;margin-top:12px;padding:8px 12px;background:#2b7cff;color:#fff;border-radius:6px;text-decoration:none}