:root{
  --bg:#f5f6f8; --panel:#ffffff; --ink:#1d2330; --muted:#6b7385; --line:#e3e6ec;
  --accent:#2f6fde; --accent-ink:#ffffff; --hover:#eef2fa; --sel:#dfe9fc; --danger:#c8382e;
  --shadow:0 6px 24px rgba(20,30,50,.12); --r:10px;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#14171d; --panel:#1c2028; --ink:#e7eaf0; --muted:#98a0b2; --line:#2b313c;
    --accent:#5b8ff0; --accent-ink:#0d1220; --hover:#242a35; --sel:#26375a; --danger:#ef6b61;
    --shadow:0 6px 24px rgba(0,0,0,.5); }
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);
  font:15px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
button,input,select{font:inherit;color:inherit}
a{color:var(--accent)}
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--panel);
  padding:8px 14px;border-radius:8px;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--hover)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}
.btn.primary:hover{filter:brightness(1.05)}
.btn.danger{color:var(--danger)}
.btn.ghost{border-color:transparent;background:transparent}
.btn svg{width:18px;height:18px;flex:none}
input[type=text],input[type=password],input[type=search],select{border:1px solid var(--line);background:var(--panel);
  padding:9px 12px;border-radius:8px;outline:none;width:100%}
input:focus,select:focus{border-color:var(--accent)}
.icon{width:20px;height:20px;flex:none}

/* layout */
.app{display:grid;grid-template-columns:232px 1fr;grid-template-rows:60px 1fr;height:100vh}
.top{grid-column:1/3;display:flex;align-items:center;gap:16px;padding:0 18px;background:var(--panel);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;min-width:196px}
.logo .mark{width:30px;height:30px;border-radius:8px;background:var(--accent);display:grid;place-items:center;color:var(--accent-ink)}
.search{flex:1;max-width:560px}
.side{background:var(--panel);border-right:1px solid var(--line);padding:14px 10px;display:flex;flex-direction:column;gap:4px;overflow:auto}
.side .nav{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:8px;cursor:pointer;color:var(--ink);text-decoration:none}
.side .nav:hover{background:var(--hover)}
.side .nav.on{background:var(--sel);font-weight:600}
.side .upl{margin:4px 2px 14px}
.side .upl .btn{width:100%;justify-content:center;padding:11px}
.quota{margin-top:auto;padding:12px;font-size:13px;color:var(--muted)}
.bar{height:6px;background:var(--line);border-radius:4px;overflow:hidden;margin-top:6px}
.bar>i{display:block;height:100%;background:var(--accent)}
.main{overflow:auto;position:relative}
.head{position:sticky;top:0;z-index:5;background:var(--bg);padding:14px 22px 10px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.crumbs{display:flex;align-items:center;flex-wrap:wrap;gap:2px;font-size:18px;font-weight:600;flex:1;min-width:200px}
.crumbs a{color:var(--ink);text-decoration:none;padding:4px 6px;border-radius:6px;cursor:pointer}
.crumbs a:hover{background:var(--hover)}
.crumbs .sep{color:var(--muted);font-weight:400}
.tools{display:flex;gap:8px;flex-wrap:wrap}
.selbar{display:none;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:6px 10px}
.selbar.on{display:flex}

/* grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:10px;padding:6px 22px 40px}
.tile{position:relative;border-radius:var(--r);padding:8px;cursor:pointer;user-select:none;border:1px solid transparent}
.tile:hover{background:var(--hover)}
.tile.sel{background:var(--sel);border-color:var(--accent)}
.tile .th{aspect-ratio:1/1;border-radius:8px;display:grid;place-items:center;overflow:hidden;background:var(--panel);border:1px solid var(--line)}
.tile .th img{width:100%;height:100%;object-fit:cover;display:block}
.tile .th svg{width:46%;height:46%}
.tile .nm{margin-top:8px;font-size:13px;line-height:1.3;word-break:break-word;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;text-align:center}
.tile .meta{font-size:12px;color:var(--muted);text-align:center;margin-top:2px}
.tile .chk{position:absolute;top:12px;left:12px;width:22px;height:22px;border-radius:50%;border:2px solid #fff;background:rgba(0,0,0,.25);display:none}
.tile:hover .chk,.tile.sel .chk,.grid.selecting .chk{display:block}
.tile.sel .chk{background:var(--accent);border-color:var(--accent)}
.tile .more{position:absolute;top:10px;right:10px;width:30px;height:30px;border-radius:8px;border:none;background:var(--panel);box-shadow:var(--shadow);display:none;cursor:pointer;align-items:center;justify-content:center}
.tile:hover .more{display:flex}
.tile .vbadge{position:absolute;left:16px;bottom:58px;background:rgba(0,0,0,.6);color:#fff;font-size:11px;padding:2px 6px;border-radius:5px}

/* list view */
.list{padding:0 22px 40px}
.row{display:grid;grid-template-columns:36px 1fr 140px 110px 40px;align-items:center;gap:10px;padding:6px 8px;border-radius:8px;cursor:pointer;border-bottom:1px solid var(--line)}
.row:hover{background:var(--hover)}
.row.sel{background:var(--sel)}
.row .ri{width:32px;height:32px;border-radius:6px;overflow:hidden;display:grid;place-items:center}
.row .ri img{width:100%;height:100%;object-fit:cover}
.row .ri svg{width:24px;height:24px}
.row .m{color:var(--muted);font-size:13px}
.row .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.month{grid-column:1/-1;font-weight:700;font-size:16px;margin:16px 4px 2px}
.empty{padding:60px 20px;text-align:center;color:var(--muted)}

/* menus, dialogs */
.menu{position:fixed;z-index:50;background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:6px;min-width:200px}
.menu button{display:flex;width:100%;align-items:center;gap:10px;border:none;background:none;padding:9px 12px;border-radius:7px;cursor:pointer;text-align:left}
.menu button:hover{background:var(--hover)}
.menu button.danger{color:var(--danger)}
.overlay{position:fixed;inset:0;z-index:60;background:rgba(10,14,22,.45);display:grid;place-items:center;padding:16px}
.dialog{background:var(--panel);border-radius:14px;box-shadow:var(--shadow);width:min(460px,100%);padding:22px;display:flex;flex-direction:column;gap:14px}
.dialog h3{margin:0;font-size:18px}
.dialog .row2{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
.dialog label{font-size:13px;color:var(--muted);display:flex;flex-direction:column;gap:6px}
.dialog .check{flex-direction:row;align-items:center;gap:8px;color:var(--ink);font-size:14px}
.linkbox{display:flex;gap:8px}
.linkbox input{font-size:13px}

/* viewer */
.viewer{position:fixed;inset:0;z-index:70;background:#0b0d11;display:flex;flex-direction:column;color:#eee}
.viewer .vt{display:flex;align-items:center;gap:10px;padding:10px 14px;background:rgba(0,0,0,.4)}
.viewer .vt .t{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.viewer .vt .btn{background:transparent;border-color:#3a3f4a;color:#eee}
.viewer .vt .btn:hover{background:#252a33}
.viewer .stage{flex:1;display:grid;place-items:center;position:relative;overflow:hidden;touch-action:pan-y}
.viewer .stage img,.viewer .stage video{max-width:100%;max-height:100%;object-fit:contain}
.viewer .stage iframe{width:100%;height:100%;border:0;background:#fff}
.viewer .nav{position:absolute;top:50%;transform:translateY(-50%);width:48px;height:72px;border:none;background:rgba(255,255,255,.08);color:#fff;border-radius:10px;cursor:pointer;font-size:28px}
.viewer .nav:hover{background:rgba(255,255,255,.18)}
.viewer .prev{left:12px}.viewer .next{right:12px}
.viewer .nofile{text-align:center;color:#bbb}

/* upload progress */
.toast{position:fixed;right:18px;bottom:18px;z-index:80;background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:12px;padding:14px 16px;width:min(340px,calc(100% - 36px));font-size:14px}
.toast .bar{margin-top:8px}
.drop{position:fixed;inset:0;z-index:65;background:rgba(47,111,222,.12);border:3px dashed var(--accent);display:none;place-items:center;font-size:22px;font-weight:700;color:var(--accent)}
.drop.on{display:grid}

/* login / share */
.center{min-height:100vh;display:grid;place-items:center;padding:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:28px;width:min(380px,100%);display:flex;flex-direction:column;gap:14px}
.card h1{margin:0;font-size:22px;display:flex;align-items:center;gap:10px}
.err{color:var(--danger);font-size:14px}
.sharehead{display:flex;align-items:center;gap:14px;padding:14px 22px;background:var(--panel);border-bottom:1px solid var(--line);flex-wrap:wrap}

.mobile-only{display:none}
@media (max-width:760px){
  .app{grid-template-columns:1fr;grid-template-rows:56px 1fr}
  .top{grid-column:1;padding:0 10px;gap:8px}
  .logo{min-width:0}.logo span{display:none}
  .side{position:fixed;left:0;top:56px;bottom:0;width:250px;z-index:40;transform:translateX(-100%);transition:transform .2s;box-shadow:var(--shadow)}
  .side.open{transform:none}
  .mobile-only{display:inline-flex}
  .grid{grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:6px;padding:4px 10px 40px}
  .head{padding:10px}
  .crumbs{font-size:16px}
  .tools .lbl{display:none}
  .row{grid-template-columns:36px 1fr 40px}
  .row .m{display:none}
  .list{padding:0 10px 40px}
  .tile .more{display:flex;width:26px;height:26px;top:6px;right:6px}
  .viewer .nav{display:none}
}