:root{
  --bg:#f4f6fb; --panel:#ffffff; --ink:#0f172a; --ink-2:#475569; --muted:#94a3b8; --line:#e6eaf2;
  --side:#0d1424; --side-2:#141d33; --side-ink:#cbd5e1; --side-muted:#64748b;
  --accent:#10b981; --accent-2:#059669; --accent-soft:#e7f8f1; --danger:#ef4444;
  --radius:14px; --shadow:0 1px 2px rgba(15,23,42,.04),0 6px 24px rgba(15,23,42,.06);
  font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);font-size:14px}
.hidden{display:none!important}
svg{width:18px;height:18px;fill:currentColor;flex:none}
.muted{color:var(--ink-2)}
button{font:inherit;cursor:pointer}
input{font:inherit}

/* brand */
.brand{display:flex;align-items:center;gap:10px;font-size:17px;color:#fff;letter-spacing:.2px}
.brand b{color:var(--accent)}
.brand.big{font-size:22px;color:var(--ink);justify-content:center}
.logo{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,#34d399,#059669);position:relative;box-shadow:0 4px 14px rgba(16,185,129,.35)}
.logo:after{content:"";position:absolute;inset:8px;border:2px solid #fff;border-radius:3px;background:linear-gradient(#fff 0 0) center/2px 100% no-repeat,linear-gradient(#fff 0 0) center/100% 2px no-repeat}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:9px 14px;border-radius:10px;font-weight:550;transition:.15s}
.btn:hover{border-color:#cfd6e4;background:#f8fafc}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(16,185,129,.28)}
.btn.primary:hover{background:var(--accent-2)}
.btn.ghost{background:transparent}
.btn.block{width:100%;justify-content:center}
.btn.danger{color:var(--danger)}
.icon-btn{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;border:0;background:transparent;color:inherit}
.icon-btn:hover{background:rgba(148,163,184,.15)}

/* login */
.login{position:fixed;inset:0;display:grid;place-items:center;background:radial-gradient(1200px 600px at 20% -10%,#d1fae5,transparent),var(--bg)}
.login-card{width:min(380px,calc(100% - 32px));background:var(--panel);padding:32px;border-radius:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:14px;text-align:center}
.login-card input,.modal-card input{padding:11px 13px;border:1px solid var(--line);border-radius:10px;outline:none;width:100%}
.login-card input:focus,.modal-card input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.err{color:var(--danger);min-height:1em;margin:0}

/* layout */
.app{display:flex;height:100vh;overflow:hidden}
.sidebar{width:264px;flex:none;background:var(--side);color:var(--side-ink);display:flex;flex-direction:column;padding:20px 14px;gap:14px}
.nav{display:flex;flex-direction:column;gap:2px;margin-top:8px}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;color:var(--side-ink);text-decoration:none;font-weight:500}
.nav-item:hover{background:var(--side-2)}
.nav-item.active{background:var(--side-2);color:#fff;box-shadow:inset 3px 0 0 var(--accent)}
.side-section{display:flex;align-items:center;justify-content:space-between;color:var(--side-muted);font-size:11px;text-transform:uppercase;letter-spacing:.9px;font-weight:700;padding:8px 6px 0 12px}
.side-section .icon-btn{color:var(--side-ink)}
.ws-list{list-style:none;margin:0;padding:0;overflow:auto;flex:1;display:flex;flex-direction:column;gap:2px}
.ws-item{display:flex;align-items:center;gap:10px;padding:9px 10px 9px 12px;border-radius:10px;cursor:pointer;user-select:none}
.ws-item:hover{background:var(--side-2)}
.ws-item.active{background:var(--side-2);color:#fff;box-shadow:inset 3px 0 0 var(--accent)}
.ws-dot{width:10px;height:10px;border-radius:3px;flex:none}
.ws-name{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ws-count{font-size:11px;color:var(--side-muted);background:rgba(148,163,184,.12);padding:2px 7px;border-radius:20px}
.ws-item input{flex:1;min-width:0;background:#0b1220;border:1px solid var(--accent);color:#fff;border-radius:6px;padding:3px 6px}
.ws-empty{color:var(--side-muted);font-size:13px;padding:8px 12px}
.side-foot{display:flex;flex-direction:column;gap:12px}
.side-foot .btn{color:var(--side-ink);border-color:#24304a}
.side-foot .btn:hover{background:var(--side-2)}
.storage{background:var(--side-2);border-radius:12px;padding:12px}
.storage-label{display:flex;justify-content:space-between;font-size:12px;color:var(--side-muted);margin-bottom:8px}
.storage-label span:last-child{color:#fff}
.bar{height:6px;background:#24304a;border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#34d399,#10b981);border-radius:6px}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{height:64px;flex:none;display:flex;align-items:center;gap:16px;padding:0 28px;background:var(--panel);border-bottom:1px solid var(--line)}
.crumbs{flex:1;font-weight:600;font-size:15px;display:flex;align-items:center;gap:8px;min-width:0;white-space:nowrap;overflow:hidden}
.crumbs .sep{color:var(--muted)}
.crumbs a{color:var(--ink-2);text-decoration:none}
.search{display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--line);padding:8px 12px;border-radius:10px;width:min(320px,40vw);color:var(--muted)}
.search input{border:0;background:transparent;outline:none;flex:1;color:var(--ink);min-width:0}
.view{flex:1;overflow:auto;padding:28px}
.mobile-only{display:none}

/* page header */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.page-head h1{margin:0;font-size:24px;letter-spacing:-.3px;display:flex;align-items:center;gap:10px}
.page-head h1 .icon-btn{color:var(--muted)}
.page-head p{margin:4px 0 0;color:var(--ink-2)}
.actions{display:flex;gap:10px;flex-wrap:wrap}

/* KPI */
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:24px}
.kpi{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);display:flex;gap:14px;align-items:center}
.kpi .k-ico{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent-2)}
.kpi .k-ico.b{background:#eef2ff;color:#4f46e5}.kpi .k-ico.c{background:#fff7ed;color:#ea580c}
.kpi .k-val{font-size:24px;font-weight:700;letter-spacing:-.5px}
.kpi .k-lab{color:var(--ink-2);font-size:13px}

.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.card-head{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line)}
.card-head h2{font-size:15px;margin:0}
.table{width:100%;border-collapse:collapse}
.table td,.table th{padding:12px 20px;text-align:left;border-bottom:1px solid var(--line)}
.table th{font-size:12px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.6px}
.table tr:last-child td{border-bottom:0}
.table tbody tr{cursor:pointer}
.table tbody tr:hover{background:#f8fafc}
.cell-file{display:flex;align-items:center;gap:10px;font-weight:550}

.ws-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.ws-card{padding:18px;cursor:pointer;transition:.15s}
.ws-card:hover{transform:translateY(-2px);border-color:#cfd6e4}
.ws-card .ws-dot{width:36px;height:36px;border-radius:10px;margin-bottom:14px}
.ws-card h3{margin:0 0 4px;font-size:15px}

/* files */
.files{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px}
.file{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;cursor:pointer;user-select:none;transition:.15s;position:relative}
.file:hover{border-color:var(--accent);transform:translateY(-2px)}
.file.sel{outline:2px solid var(--accent);outline-offset:-1px}
.file .thumb{height:118px;background:linear-gradient(180deg,#f8fafc,#eef2f7);display:grid;place-items:center;border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.grid-art{width:78%;height:70%;background:#fff;border-radius:6px;box-shadow:0 2px 8px rgba(15,23,42,.08);background-image:linear-gradient(#e2e8f0 1px,transparent 1px),linear-gradient(90deg,#e2e8f0 1px,transparent 1px);background-size:100% 14px,28px 100%;position:relative}
.grid-art:before{content:"";position:absolute;left:0;right:0;top:0;height:14px;background:#d1fae5;border-radius:6px 6px 0 0}
.file .meta{padding:12px 14px}
.file .fname{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:8px}
.file .fsub{color:var(--muted);font-size:12px;margin-top:4px}
.file .more{position:absolute;top:8px;right:8px;background:rgba(255,255,255,.9);color:var(--ink-2)}
.file-ico{width:22px;height:22px;border-radius:5px;background:linear-gradient(135deg,#34d399,#059669);flex:none;position:relative}
.file-ico:after{content:"";position:absolute;inset:6px 5px;border:1.5px solid #fff;border-radius:1px;background:linear-gradient(#fff 0 0) center/1.5px 100% no-repeat,linear-gradient(#fff 0 0) center/100% 1.5px no-repeat}
.file-ico.small{width:20px;height:20px}
.hint{color:var(--muted);font-size:12px;margin:-8px 0 16px}

.drop{border:2px dashed #cdd5e1;border-radius:var(--radius);padding:42px 20px;text-align:center;color:var(--ink-2);background:var(--panel);transition:.15s}
.drop.over{border-color:var(--accent);background:var(--accent-soft)}
.drop h3{margin:10px 0 6px;color:var(--ink)}
.drop .big-ico{width:56px;height:56px;border-radius:16px;background:var(--accent-soft);color:var(--accent-2);display:grid;place-items:center;margin:0 auto}
.drop .big-ico svg{width:28px;height:28px}
.dragging .view{outline:2px dashed var(--accent);outline-offset:-12px}

/* editor */
.editor{position:fixed;inset:0;z-index:50;background:var(--panel);display:flex;flex-direction:column}
.editor-bar{height:56px;flex:none;display:flex;align-items:center;gap:12px;padding:0 14px;border-bottom:1px solid var(--line);background:var(--panel)}
.ed-title{display:flex;align-items:center;gap:8px;flex:1;min-width:0}
.ed-title input{font-weight:650;font-size:16px;border:1px solid transparent;border-radius:8px;padding:5px 8px;min-width:60px;max-width:420px;width:100%;outline:none;background:transparent}
.ed-title input:hover{border-color:var(--line)}
.ed-title input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.ed-ws{color:var(--muted);font-size:13px;white-space:nowrap}
.ed-actions{display:flex;gap:8px}
.pill{font-size:12px;padding:4px 10px;border-radius:20px;background:var(--accent-soft);color:var(--accent-2);font-weight:600;white-space:nowrap}
.pill.dirty{background:#fff7ed;color:#c2410c}
.pill.err{background:#fef2f2;color:var(--danger)}
.ed-host{flex:1;position:relative}
#luckysheet{position:absolute;inset:0;margin:0;padding:0}

/* modal, ctx, toast, busy */
.modal{position:fixed;inset:0;z-index:1000;background:rgba(15,23,42,.45);display:grid;place-items:center;backdrop-filter:blur(2px)}
.modal-card{width:min(440px,calc(100% - 32px));background:var(--panel);border-radius:16px;padding:22px;box-shadow:0 20px 60px rgba(15,23,42,.3);display:flex;flex-direction:column;gap:12px}
.modal-card h3{margin:0}.modal-card p{margin:0}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:4px}
.ctx{position:fixed;z-index:1001;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 40px rgba(15,23,42,.18);padding:6px;min-width:190px}
.ctx button{display:flex;width:100%;align-items:center;gap:10px;border:0;background:transparent;padding:9px 10px;border-radius:8px;text-align:left;color:var(--ink)}
.ctx button:hover{background:var(--bg)}
.ctx button.danger{color:var(--danger)}
.ctx hr{border:0;border-top:1px solid var(--line);margin:4px 0}
.toast{position:fixed;bottom:70px;left:50%;transform:translate(-50%,30px);opacity:0;background:var(--ink);color:#fff;padding:11px 18px;border-radius:12px;z-index:1002;transition:.25s;pointer-events:none;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:var(--danger)}
.busy{position:fixed;inset:0;z-index:999;background:rgba(244,246,251,.75);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;font-weight:600}
.spinner{width:38px;height:38px;border-radius:50%;border:4px solid var(--accent-soft);border-top-color:var(--accent);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.empty{text-align:center;color:var(--ink-2);padding:30px}

@media (max-width:820px){
  .sidebar{position:fixed;inset:0 auto 0 0;z-index:60;transform:translateX(-100%);transition:.2s}
  .sidebar.open{transform:none;box-shadow:0 0 0 100vmax rgba(15,23,42,.4)}
  .mobile-only{display:inline-grid}
  .topbar{padding:0 16px}.view{padding:16px}
  .search{display:none}
  .ed-actions .btn:not(.primary){display:none}
  .ed-ws{display:none}
}