:root{
  --desk:#EEF1F5; --card:#FFFFFF; --ink:#1B1F24; --ink2:#3D4652; --muted:#5B6573; --line:#E2E6EC;
  --blue:#1F4FC8; --blue-soft:#F4F7FE; --blue-edge:#9DB3E6; --chip:#F2F4F7;
  --green:#1D5E3C; --green-bg:#E8F4EE; --amber:#6B4A00; --amber-bg:#FFF6E5; --amber-edge:#F0D49A;
  --red:#B3261E; --red-bg:#FDECEA;
  --font:Inter,system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  color-scheme:light;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0;overflow:hidden}
body{background:var(--card);color:var(--ink);font-family:var(--font);overscroll-behavior-y:contain}
#app{height:100%;display:flex;flex-direction:column;position:relative;overflow:hidden;padding-top:env(safe-area-inset-top,0)}
button{font:inherit;color:inherit;cursor:pointer}
svg{display:block}

/* app bar + tabs */
.appbar{flex:none;display:flex;align-items:center;gap:8px;padding:10px 14px}
.appbar .name{font-size:18px;font-weight:700;letter-spacing:-.01em;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.appbar .avatar{margin-left:auto;width:32px;height:32px;border-radius:50%;background:var(--blue);color:#fff;font-size:14px;font-weight:600;display:flex;align-items:center;justify-content:center;flex:none}
.iconbtn{width:44px;height:44px;border:0;background:none;border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--ink);flex:none}
.iconbtn:active{background:var(--chip)}
.iconbtn svg{width:22px;height:22px}
.appbar .iconbtn.first{margin-left:-10px}
.content{flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;display:flex;flex-direction:column;gap:10px;padding:0 14px 16px;-webkit-overflow-scrolling:touch}
.tabbar{flex:none;display:flex;border-top:1px solid var(--line);background:var(--card);padding:6px 4px calc(6px + env(safe-area-inset-bottom,0))}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11px;font-weight:600;color:var(--muted);min-height:48px;justify-content:center;background:none;border:0}
.tab.on{color:var(--blue)}
.tab svg{width:22px;height:22px}

/* pills, buttons */
.pills{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.pill{border-radius:999px;padding:6px 11px;font-size:12px}
.pill.g{background:var(--green-bg);color:var(--green);font-weight:600}
.pill.n{background:var(--chip);color:var(--ink2)}
.btn{min-height:48px;border-radius:12px;border:1px solid var(--blue);background:#fff;color:var(--blue);font:600 15px var(--font);display:flex;align-items:center;justify-content:center;gap:8px;padding:0 16px;text-align:center}
.btn.p{background:var(--blue);color:#fff}
.btn.full{width:100%}
.btn:active{opacity:.8}
.btn svg{width:20px;height:20px}
.refresh{margin-left:auto;min-height:36px;padding:0 12px;font-size:13px;border-radius:999px}
.refresh svg{width:16px;height:16px}
.crumbs{display:flex;gap:2px;align-items:center;overflow-x:auto;white-space:nowrap;flex:none;scrollbar-width:none;font-size:13px;color:var(--muted)}
.crumbs::-webkit-scrollbar{display:none}
.crumbs button{border:0;background:none;padding:8px 6px;min-height:36px;font-weight:600;color:var(--blue);border-radius:8px}
.crumbs button:last-child{color:var(--ink)}
.crumbs i{font-style:normal;color:#9AA3B0}

/* grid */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.item{border:1px solid var(--line);border-radius:12px;padding:8px;display:flex;flex-direction:column;gap:6px;background:#fff;min-width:0;text-align:left;width:100%}
.item:active{background:var(--blue-soft)}
.item .nm{font-size:13px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.badges{display:flex;gap:4px;flex-wrap:wrap}
.badge{font-size:10.5px;border-radius:999px;padding:2px 8px;border:1px solid #C9D3E3;color:var(--ink2)}
.badge.dr{background:var(--green-bg);border-color:#BFE0CE;color:var(--green);font-weight:600}
.thumb{height:88px;border-radius:8px;display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}
.thumb svg{width:36px;height:36px}
.thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.photo{background:linear-gradient(135deg,#DCE6FB,#C4D5F7);color:#2D58C4}
.video{background:linear-gradient(135deg,#FBE6D6,#F6CFB3);color:#A4521C}
.doc{background:linear-gradient(135deg,#E3EEE8,#CFE2D8);color:#3D6B54}
.folder{background:linear-gradient(135deg,#FFF1C9,#FBE3A0);color:#8A6200}
.audio{background:linear-gradient(135deg,#EBE1F7,#DACBF0);color:#6A3FA0}

/* states */
.empty,.msg{border:1px dashed var(--blue-edge);background:var(--blue-soft);border-radius:14px;padding:22px 16px;text-align:center;color:var(--ink2);font-size:15px;line-height:1.5}
.msg.err{border:1px solid #F1B8B4;background:var(--red-bg);color:var(--red);font-weight:600;text-align:left}
.msg.err small{display:block;font-weight:400;color:var(--ink2);margin-top:6px;word-break:break-word}
.stack{display:flex;flex-direction:column;gap:10px}
.center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:24px;text-align:center}
.center h1{margin:0;font-size:26px;color:var(--blue)}
.center p{margin:0;color:var(--muted);font-size:15px;line-height:1.45;max-width:30ch}
.center .logo{width:84px;height:84px;border-radius:20px}
.center .btn{width:100%;max-width:320px;min-height:56px;font-size:17px}
.center .msg{max-width:340px;width:100%}
.spin{width:30px;height:30px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--blue);animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.ptr{height:0;overflow:hidden;text-align:center;font-size:12px;color:var(--muted);flex:none;transition:height .15s}
.ptr.show{height:30px;line-height:30px}

/* sheet */
.scrim{position:absolute;inset:0;background:rgba(20,30,50,.38);z-index:20}
.sheet{position:absolute;left:0;right:0;bottom:0;z-index:21;background:#fff;border-radius:22px 22px 0 0;padding:10px 14px calc(22px + env(safe-area-inset-bottom,0));display:flex;flex-direction:column;gap:6px}
.grab{width:38px;height:4px;border-radius:4px;background:#C9D0DA;align-self:center;margin-bottom:6px}
.sheet .head{display:flex;gap:12px;align-items:center;padding:0 6px 8px}
.sheet .head .thumb{width:64px;height:48px;flex:none}
.sheet .head .thumb svg{width:24px;height:24px}
.sheet .ttl{font-weight:700;font-size:15px;overflow-wrap:anywhere}
.sub{font-size:12px;color:var(--muted)}
.row{display:flex;align-items:center;gap:12px;min-height:52px;border-radius:12px;padding:0 10px;font-size:15px;font-weight:600;border:0;background:none;text-align:left;width:100%}
.row:active{background:var(--chip)}
.row svg{width:22px;height:22px;flex:none;color:var(--ink2)}
.row small{display:block;font-weight:400;font-size:12px;color:var(--muted);margin-top:1px}
.row.main{background:var(--blue);color:#fff;padding:0 14px}
.row.main svg{color:#fff}
.note-box{border-radius:10px;padding:12px;font-size:13.5px;line-height:1.45}
.note-box.amber{background:var(--amber-bg);border:1px solid var(--amber-edge);color:var(--amber)}
.note-box.blue{background:var(--blue-soft);border:1px solid var(--blue-edge);color:var(--ink2)}

/* viewer */
.viewer{position:absolute;inset:0;z-index:30;background:#fff;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0)}
.vstage{flex:1;min-height:0;display:flex;flex-direction:column;gap:10px;padding:0 14px 16px;overflow:auto}
.vstage img.full{max-width:100%;max-height:100%;object-fit:contain;margin:auto;border-radius:8px}
.vstage video{width:100%;max-height:70vh;background:#10141A;border-radius:12px}
.vstage audio{width:100%;margin:auto 0}
.vstage iframe{flex:1;width:100%;border:1px solid var(--line);border-radius:10px;background:#fff}
.vstage pre{margin:0;white-space:pre-wrap;overflow-wrap:anywhere;font:13px/1.5 ui-monospace,Menlo,Consolas,monospace;border:1px solid var(--line);border-radius:10px;padding:12px;background:var(--blue-soft)}
.player{background:#10141A;border-radius:12px;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;color:#fff}
.player svg{width:40px;height:40px}
.btnrow{display:flex;gap:8px}
.btnrow .btn{flex:1}

#toast{position:fixed;left:16px;right:16px;bottom:calc(84px + env(safe-area-inset-bottom,0));z-index:50;background:#1B1F24;color:#fff;border-radius:12px;padding:13px 16px;font-size:14px;line-height:1.4;text-align:center;opacity:0;transform:translateY(8px);pointer-events:none;transition:opacity .2s,transform .2s;max-width:420px;margin:0 auto}
#toast.show{opacity:1;transform:none}

/* settings */
.set{border:1px solid var(--line);border-radius:12px;display:flex;flex-direction:column}
.set .s{display:flex;align-items:center;gap:10px;padding:12px;font-size:14px}
.set .s+.s{border-top:1px solid var(--line)}
.set .s div{flex:1;min-width:0;overflow-wrap:anywhere}
.set .s small{display:block;color:var(--muted);font-size:12px;margin-top:2px}
h2.t{margin:0;font-size:20px}
.label{font-size:12px;color:var(--muted);font-weight:600;letter-spacing:.03em;text-transform:uppercase}

/* library */
.search{width:100%;min-height:44px;border:1px solid var(--line);border-radius:12px;padding:0 14px;font:15px var(--font);color:var(--ink);background:var(--chip);flex:none;-webkit-appearance:none;appearance:none}
.search:focus{outline:2px solid var(--blue-edge);background:#fff}
.chips{display:flex;gap:6px;overflow-x:auto;flex:none;scrollbar-width:none;padding-bottom:2px}
.chips::-webkit-scrollbar{display:none}
.chip{flex:none;min-height:36px;border-radius:999px;border:1px solid var(--line);background:#fff;padding:0 12px;font:600 13px var(--font);color:var(--ink2);display:flex;align-items:center;gap:5px;white-space:nowrap}
.chip b{font-weight:600;color:var(--muted);font-size:12px}
.chip.on{background:var(--blue);border-color:var(--blue);color:#fff}
.chip.on b{color:#DCE6FB}
.chip.folders{border-color:var(--blue);color:var(--blue)}
.chip svg{width:16px;height:16px}
.pill small{font-size:10.5px;color:var(--muted);margin-left:3px}
.savednote{text-align:center}
.badge.pc{background:#E6EEFC;border-color:#B5C8F0;color:var(--blue);font-weight:600}
.badge.both{background:#EDF0F5;border-color:#C5CEDD;color:#43536B;font-weight:600}
.item.shelved{border-style:dashed;border-color:#9FB8AA;background:#F5F7F6}
.item.shelved .thumb{opacity:.72;filter:grayscale(.45)}
.item .thumb img{background:#fff}