:root{
  --bg:#f4f6f9; --panel:#ffffff; --ink:#1f2a37; --muted:#6b7a8d;
  --line:#e2e8f0; --brand:#0d4d8c; --brand-d:#093a6b; --accent:#1c7ed6;
  --danger:#d64545; --ok:#2f9e44; --shadow:0 1px 3px rgba(16,42,67,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:15px;line-height:1.45}
a{color:var(--accent);text-decoration:none}

/* Top bar */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px 20px;background:linear-gradient(90deg,var(--brand),var(--brand-d));color:#fff;
  position:sticky;top:0;z-index:20;box-shadow:var(--shadow)}
.brand{display:flex;align-items:center;gap:12px}
.logo{height:42px;width:auto;background:#fff;border-radius:8px;padding:3px}
.titles h1{margin:0;font-size:19px;font-weight:650;letter-spacing:.2px}
.titles p{margin:2px 0 0;font-size:12px;opacity:.85}
.admin-box{display:flex;align-items:center;gap:10px}
.admin-state{font-size:13px;opacity:.9}

/* Buttons */
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:8px;
  padding:8px 14px;font-size:14px;cursor:pointer;transition:.12s;white-space:nowrap}
.btn:hover{background:#f0f4f8}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:#1668b8}
.btn.ghost{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.btn.ghost:hover{background:rgba(255,255,255,.15)}
.btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn.danger:hover{filter:brightness(.94)}
.btn.small{padding:5px 10px;font-size:13px;border-radius:6px}
.btn.disabled{opacity:.5;cursor:default;background:#f1f3f5}
.btn:disabled{opacity:.5;cursor:default}

/* Breadcrumbs */
.crumbs{padding:12px 20px 0;display:flex;flex-wrap:wrap;align-items:center;gap:4px;font-size:14px}
.crumb{color:var(--brand);font-weight:500}
.crumb.cur{color:var(--ink);font-weight:600}
.crumbs .sep{color:var(--muted);margin:0 2px}

/* Toolbar */
.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:14px 20px}
.toolbar .spacer{flex:1}
.selbar{display:flex;align-items:center;gap:8px;background:#eaf2fb;border:1px solid #cfe1f6;
  padding:6px 10px;border-radius:10px}
.selbar #selCount{font-size:13px;color:var(--brand-d);font-weight:600}

/* Listing */
.listing{padding:4px 20px 40px;max-width:1100px;margin:0 auto}
.loading,.empty{padding:40px 10px;text-align:center;color:var(--muted)}

.grid.folders{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-bottom:22px}
.fcard{display:flex;align-items:center;gap:12px;background:var(--panel);border:1px solid var(--line);
  border-radius:12px;padding:12px 14px;cursor:pointer;box-shadow:var(--shadow);transition:.12s;position:relative}
.fcard:hover{border-color:#b9d3ef;transform:translateY(-1px)}
.fcard.drop{outline:2px dashed var(--accent);outline-offset:2px;background:#eef6ff}
.fcard.dragging{opacity:.5}
.fcard .fic{font-size:30px;line-height:1}
.fcard .fmeta{flex:1;min-width:0}
.fcard .fname{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fcard .fsub{font-size:12px;color:var(--muted)}
.fcard .facts{display:flex;gap:2px;opacity:0;transition:.12s}
.fcard:hover .facts{opacity:1}
.ic{border:none;background:transparent;cursor:pointer;font-size:15px;padding:5px;border-radius:6px;line-height:1}
.ic:hover{background:#eef2f7}
.ic.del:hover{background:#fde8e8}

/* File list */
.filelist{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.fl-head,.frow{display:grid;grid-template-columns:34px 1fr 90px auto;align-items:center;gap:10px;padding:10px 14px}
.fl-head{background:#f7f9fc;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted);
  text-transform:uppercase;letter-spacing:.5px;font-weight:600}
.frow{border-bottom:1px solid var(--line);cursor:default;margin:0}
.frow:last-child{border-bottom:none}
.frow:hover{background:#f8fafc}
.c-name{display:flex;align-items:center;gap:10px;min-width:0}
.ficon{font-size:20px;flex:none}
.ftext{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.c-size{color:var(--muted);font-size:13px;text-align:right}
.c-act{display:flex;align-items:center;gap:6px;justify-content:flex-end}
.selbox{width:16px;height:16px;cursor:pointer}

/* Progress overlay */
.progress-wrap{position:fixed;inset:0;background:rgba(15,30,50,.5);display:flex;
  align-items:center;justify-content:center;z-index:50}
.progress-card{background:#fff;border-radius:14px;padding:22px 24px;width:min(460px,92vw);box-shadow:0 10px 40px rgba(0,0,0,.25)}
.progress-title{font-weight:600;margin-bottom:12px}
.progress-bar{height:9px;background:#e9eef4;border-radius:6px;overflow:hidden}
.progress-fill{height:100%;width:0;background:var(--accent);transition:width .2s}
.progress-log{margin-top:12px;max-height:180px;overflow:auto;font-size:13px;color:var(--muted);font-family:ui-monospace,monospace}
.progress-log .err{color:var(--danger)}

.foot{text-align:center;color:var(--muted);font-size:12px;padding:18px}

/* Viewer page */
.viewer-body{display:flex;flex-direction:column;height:100vh;margin:0}
.viewer-top{flex:none}
.viewer-top .vtitle{flex:1;text-align:center;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:0 10px}
.viewer{flex:1;position:relative;background:#525659;min-height:0}
.docframe{width:100%;height:100%;border:none;background:#fff}
.imgwrap{width:100%;height:100%;overflow:auto;display:flex;align-items:center;justify-content:center;padding:16px}
.imgwrap img{max-width:100%;height:auto;box-shadow:0 4px 20px rgba(0,0,0,.4)}
.vnote{position:absolute;top:0;left:0;right:0;padding:10px 16px;background:#fff8e1;color:#7a5b00;
  text-align:center;font-size:14px;z-index:2}

@media (max-width:640px){
  .titles h1{font-size:16px}.titles p{display:none}
  .fl-head .c-size,.frow .c-size{display:none}
  .fl-head,.frow{grid-template-columns:30px 1fr auto}
}