:root{
    --bg:#f4f6fb;
    --card:#ffffff;
    --text:#1f2733;
    --muted:#8a93a3;
    --border:#e6e9f0;
    --primary:#3b6ef5;
    --primary-dark:#2f59d6;
    --danger:#e5484d;
    --radius:12px;
    --shadow:0 1px 3px rgba(20,30,60,.06),0 6px 24px rgba(20,30,60,.05);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{
    margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Helvetica,Arial,sans-serif;
    background:var(--bg);color:var(--text);font-size:14px;line-height:1.6;
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.muted{color:var(--muted)}
.fileicon{vertical-align:-0.3em;flex:none}

/* ---------- 顶栏 ---------- */
.topbar{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.topbar-inner{max-width:1080px;margin:0 auto;padding:0 20px;height:58px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:700;font-size:18px;color:var(--text)}
.brand:hover{text-decoration:none}
.topnav a{margin-left:18px;color:var(--muted);font-weight:500}
.topnav a.active{color:var(--text)}
.topnav a.logout{color:var(--danger)}

.container{max-width:1080px;margin:24px auto;padding:0 20px}

/* ---------- 卡片 ---------- */
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}

/* ---------- 工具栏 ---------- */
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.breadcrumb{font-size:15px}
.breadcrumb .sep{color:var(--muted);margin:0 6px}
.toolbar-actions{display:flex;gap:10px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);background:var(--card);color:var(--text);
    padding:8px 14px;border-radius:9px;font-size:14px;cursor:pointer;transition:.15s;line-height:1;white-space:nowrap}
.btn:hover{background:#f0f3fa;text-decoration:none}
.btn:disabled,.btn[disabled]{opacity:.6;cursor:default}
.btn:disabled:hover{background:var(--card)}
.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn-danger:hover{background:#cf3b40;color:#fff}
.btn-block{width:100%;justify-content:center;margin-top:8px}
.btn-lg{padding:12px 22px;font-size:16px}
.btn-sm{padding:5px 12px;font-size:13px}
.icon-btn{border:none;background:transparent;cursor:pointer;font-size:17px;padding:4px 7px;border-radius:7px;color:var(--text)}
.icon-btn:hover{background:#eef1f8;text-decoration:none}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse}
thead th{text-align:left;font-weight:600;color:var(--muted);font-size:12.5px;padding:12px 16px;border-bottom:1px solid var(--border);background:#fafbfe}
tbody td{padding:11px 16px;border-bottom:1px solid var(--border);vertical-align:middle}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:#fafbff}
.col-size{width:110px;color:var(--muted)}
.col-time{width:150px;color:var(--muted)}
.col-share{width:140px}
.col-actions{width:165px;text-align:right;white-space:nowrap}
.empty{text-align:center;color:var(--muted);padding:36px!important}
.up-link{color:var(--muted)}
.path-cell{max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row-expired{opacity:.55}

.badge{display:inline-block;background:#eef2ff;color:#3b54b4;font-size:12px;padding:3px 9px;border-radius:20px;white-space:nowrap}

/* ---------- 上传区 ---------- */
.upload-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:18px;text-align:center;color:var(--muted);margin-bottom:16px;transition:.15s}
.upload-zone.drag{border-color:var(--primary);background:#eef3ff;color:var(--primary)}
.upload-progress{margin-bottom:16px}
.upload-item{background:var(--card);border:1px solid var(--border);border-radius:9px;padding:10px 14px;margin-bottom:8px}
.upload-item .bar{height:6px;background:#eef1f8;border-radius:4px;overflow:hidden;margin-top:6px}
.upload-item .bar i{display:block;height:100%;background:var(--primary);width:0;transition:width .2s}
.upload-item.done .bar i{background:#2bb673}
.upload-item.fail{border-color:var(--danger)}
.upload-item.fail .bar i{background:var(--danger)}

/* ---------- 弹窗 ---------- */
.modal{position:fixed;inset:0;background:rgba(20,28,48,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal[hidden]{display:none}
.modal-box{background:var(--card);border-radius:var(--radius);width:100%;max-width:440px;box-shadow:0 20px 60px rgba(0,0,0,.25);overflow:hidden}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}
.modal-head h3{margin:0;font-size:16px}
.modal-close{border:none;background:none;font-size:18px;cursor:pointer;color:var(--muted)}
.modal-body{padding:20px}
.modal-foot{padding:14px 20px;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:10px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:14px}
label input,label textarea,label select{display:block;width:100%;margin-top:6px;padding:9px 11px;border:1px solid var(--border);border-radius:9px;font-size:14px;font-family:inherit;color:var(--text);background:#fff}
label input:focus,label textarea:focus,label select:focus{outline:none;border-color:var(--primary)}
.copy-row{display:flex;gap:8px}
.copy-row input{flex:1}
.checkbox-row{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--text);margin-bottom:14px;cursor:pointer}
.checkbox-row input{display:inline-block;width:auto;margin:0}
.invite-code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;background:#f0f3fa;padding:3px 8px;border-radius:6px;letter-spacing:.5px}
.search-form{display:flex;gap:8px;align-items:center}
.search-form input{padding:8px 11px;border:1px solid var(--border);border-radius:9px;font-size:14px;min-width:180px}
.share-result{background:#f0fff6;border:1px solid #c8edd6;border-radius:9px;padding:12px;margin-top:8px}

/* ---------- 提示 ---------- */
.alert{padding:10px 14px;border-radius:9px;margin-bottom:14px;font-size:13px}
.alert.error{background:#fdeced;color:var(--danger);border:1px solid #f5c2c4}

/* ---------- 登录 ---------- */
.login-body{display:flex;align-items:center;justify-content:center;min-height:100vh}
.login-card{background:var(--card);border-radius:16px;box-shadow:var(--shadow);padding:36px 32px;width:340px}
.login-card h1{margin:0 0 4px;font-size:22px}
.login-card form{margin-top:18px}

/* ---------- 分享页 ---------- */
.share-body{background:var(--bg)}
.share-wrap{max-width:760px;margin:30px auto;padding:0 18px}
.share-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.share-desc{padding:16px 18px;margin-bottom:16px}
.share-desc p{margin:6px 0 0}
.file-card{text-align:center;padding:40px 20px}
.file-actions{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:6px}
.modal-box-lg{max-width:780px}
.preview-area{width:100%;min-height:340px;max-height:62vh;box-sizing:border-box;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.55;white-space:pre-wrap;word-break:break-word;overflow:auto;resize:vertical;border:1px solid var(--border);border-radius:9px;padding:12px;background:#fafbfe;color:var(--text)}
.center-card{text-align:center;padding:50px 24px}
.file-big-icon{font-size:56px;line-height:1}
.file-card h2,.center-card h2{margin:14px 0 6px}
.folder-bar{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--border);flex-wrap:wrap;gap:10px}
.filelist-table{margin:0}
.pw-form{display:flex;gap:10px;margin-top:16px;justify-content:center}
.pw-form input{max-width:220px;padding:10px 12px;border:1px solid var(--border);border-radius:9px}
.share-foot{text-align:center;margin-top:24px;font-size:12px}

/* ---------- 统计 ---------- */
.stats-row{display:flex;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.stat{flex:1;min-width:160px;padding:20px;text-align:center}
.stat-num{font-size:30px;font-weight:700}
.stat-label{color:var(--muted);font-size:13px}

@media(max-width:640px){
    .col-time,.col-size{display:none}
    .toolbar{flex-direction:column;align-items:stretch}
}