*{margin:0;padding:0;box-sizing:border-box}
:root{--p:#6366f1;--ph:#4f46e5;--pl:rgba(99,102,241,.08);--pg:rgba(99,102,241,.18);--ac:#a855f7;--bg:#f4f4f8;--sf:#fff;--sfh:#f8f8fc;--bd:#e5e7eb;--bdl:#f0f0f4;--tx:#1e1e2e;--ts:#6b7280;--tm:#9ca3af;--dn:#ef4444;--ok:#22c55e;--r:12px;--rs:8px;--t:.2s cubic-bezier(.4,0,.2,1)}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--tx);height:100vh;overflow:hidden;-webkit-font-smoothing:antialiased}
.screen{width:100%;height:100vh}

/* Login */
#login-screen{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1e1b4b,#312e81 40%,#4c1d95);position:relative;overflow:hidden}
.login-bg{position:absolute;inset:0;pointer-events:none}
.shape{position:absolute;border-radius:50%;filter:blur(80px);opacity:.4;animation:fl 20s ease-in-out infinite}
.s1{width:500px;height:500px;background:#6366f1;top:-15%;left:-10%}
.s2{width:400px;height:400px;background:#a855f7;bottom:-10%;right:-5%;animation-delay:-7s;animation-duration:25s}
.s3{width:300px;height:300px;background:#ec4899;top:50%;left:50%;transform:translate(-50%,-50%);animation-delay:-14s;animation-duration:30s}
@keyframes fl{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(30px,-40px) scale(1.05)}66%{transform:translate(-20px,30px) scale(.95)}}
.login-card{background:rgba(255,255,255,.95);backdrop-filter:blur(20px);padding:44px 36px;border-radius:20px;box-shadow:0 32px 80px rgba(0,0,0,.3);width:100%;max-width:400px;margin:20px;position:relative;z-index:1;animation:ci .6s cubic-bezier(.16,1,.3,1)}
@keyframes ci{from{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}
.login-logo{text-align:center;margin-bottom:16px}
.login-card h1{text-align:center;font-size:24px;font-weight:700;margin-bottom:4px}
.login-sub{text-align:center;color:var(--tm);font-size:13px;margin-bottom:32px}
.igroup{position:relative;margin-bottom:14px}
.iico{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:16px;height:16px;color:var(--tm);pointer-events:none;transition:color var(--t)}
.igroup input{width:100%;padding:13px 14px 13px 42px;border:2px solid var(--bd);border-radius:var(--r);font-size:14px;outline:none;transition:all var(--t);background:var(--sf);color:var(--tx)}
.igroup input:focus{border-color:var(--p);box-shadow:0 0 0 4px var(--pg)}
.igroup:focus-within .iico{color:var(--p)}
.login-card button[type=submit]{width:100%;padding:13px;background:linear-gradient(135deg,var(--p),var(--ac));color:#fff;border:none;border-radius:var(--r);font-size:15px;font-weight:600;cursor:pointer;transition:all var(--t);margin-top:6px}
.login-card button[type=submit]:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(99,102,241,.35)}
.login-card button[type=submit]:disabled{opacity:.6;cursor:not-allowed;transform:none;box-shadow:none}
.error{color:var(--dn);text-align:center;margin-top:14px;font-size:13px;min-height:18px}

/* App layout */
#app-screen{display:flex;flex-direction:column;animation:fi .3s ease}
@keyframes fi{from{opacity:0}to{opacity:1}}
header{background:var(--sf);padding:0 16px;height:54px;display:flex;align-items:center;border-bottom:1px solid var(--bd);flex-shrink:0;z-index:20}
.hdr-brand{display:flex;align-items:center;gap:8px;margin-right:auto}
.hdr-brand h2{font-size:16px;font-weight:700}
.hdr-right{display:flex;align-items:center;gap:10px}
.hdr-widget{display:flex;align-items:center;gap:6px;font-size:11px;color:var(--ts);background:var(--bg);padding:5px 10px;border-radius:20px}
.st-bar{width:40px;height:3px;background:var(--bd);border-radius:2px;overflow:hidden}
.st-bar-fill{height:100%;background:var(--p);border-radius:2px;transition:width .5s ease;width:0}
.user-badge{display:flex;align-items:center;gap:6px}
.user-av{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--p),var(--ac));color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;text-transform:uppercase}
.user-badge span{font-size:12px;color:var(--ts);font-weight:500}
.ico-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:none;border:1px solid var(--bd);border-radius:var(--rs);cursor:pointer;color:var(--tm);transition:all var(--t)}
.ico-btn:hover{background:var(--bg);color:var(--tx)}
.danger-ico:hover{color:var(--dn)!important;border-color:var(--dn)!important;background:rgba(239,68,68,.05)!important}
.main-content{display:flex;flex:1;overflow:hidden}

/* Sidebar */
#sidebar{width:280px;background:var(--sf);border-right:1px solid var(--bd);display:flex;flex-direction:column;flex-shrink:0}
.sb-top{padding:12px;display:flex;flex-direction:column;gap:8px;border-bottom:1px solid var(--bdl)}
.primary-btn{width:100%;padding:9px 14px;background:var(--p);color:#fff;border:none;border-radius:var(--rs);font-size:13px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:5px;transition:all var(--t)}
.primary-btn:hover{background:var(--ph)}
.search-wrap{position:relative}
.s-ico{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--tm);pointer-events:none}
#search-input{width:100%;padding:7px 10px 7px 30px;border:1px solid var(--bd);border-radius:var(--rs);font-size:12px;outline:none;transition:all var(--t);background:var(--bg);color:var(--tx)}
#search-input:focus{border-color:var(--p);background:var(--sf);box-shadow:0 0 0 3px var(--pg)}

/* Folders */
.folder-section{padding:6px 8px}
.folder-list{display:flex;flex-direction:column;gap:1px}
.folder-item{display:flex;align-items:center;gap:6px;padding:7px 10px;border-radius:6px;cursor:pointer;font-size:12px;color:var(--ts);transition:all .12s;user-select:none}
.folder-item:hover{background:var(--sfh);color:var(--tx)}
.folder-item.active{background:var(--pl);color:var(--p);font-weight:600}
.folder-item .f-icon{width:14px;height:14px;flex-shrink:0;opacity:.6}
.folder-item .f-count{margin-left:auto;font-size:10px;background:var(--bg);padding:1px 6px;border-radius:10px;color:var(--tm)}
.folder-item.active .f-count{background:var(--pg);color:var(--p)}
.folder-item .f-del{display:none;margin-left:4px;background:none;border:none;cursor:pointer;color:var(--tm);padding:2px;border-radius:4px;line-height:0}
.folder-item:hover .f-del{display:flex}
.folder-item .f-del:hover{color:var(--dn);background:rgba(239,68,68,.1)}
.add-folder-btn{background:none;border:1px dashed var(--bd);border-radius:6px;padding:6px;font-size:11px;color:var(--tm);cursor:pointer;margin-top:4px;transition:all var(--t);width:100%;text-align:center}
.add-folder-btn:hover{border-color:var(--p);color:var(--p)}
.sb-divider{height:1px;background:var(--bdl);margin:4px 12px}

/* Notes list */
.notes-list{flex:1;overflow-y:auto;padding:4px 8px}
.note-item{padding:10px 10px;margin-bottom:1px;border-radius:var(--rs);cursor:pointer;transition:all .12s;border:1px solid transparent}
.note-item:hover{background:var(--sfh);border-color:var(--bdl)}
.note-item.active{background:var(--pl);border-color:rgba(99,102,241,.12)}
.note-item.active .ni-title{color:var(--p)}
.ni-top{display:flex;align-items:center;gap:6px;margin-bottom:3px}
.ni-type{font-size:9px;padding:1px 5px;border-radius:4px;font-weight:600;text-transform:uppercase;flex-shrink:0}
.ni-type.t-text{background:#dbeafe;color:#2563eb}
.ni-type.t-sheet{background:#d1fae5;color:#059669}
.ni-title{font-weight:600;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--tx);flex:1;min-width:0}
.ni-preview{font-size:11px;color:var(--tm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ni-date{font-size:10px;color:var(--tm);margin-top:4px;opacity:.6}
.sb-footer{padding:8px 12px;border-top:1px solid var(--bdl);text-align:center;font-size:10px;color:var(--tm)}

/* Dropdown */
.dropdown{position:relative}
.dropdown-menu{display:none;position:absolute;top:100%;left:0;background:var(--sf);border:1px solid var(--bd);border-radius:var(--rs);box-shadow:0 8px 24px rgba(0,0,0,.12);z-index:50;min-width:160px;padding:4px;margin-top:4px}
.dropdown.open .dropdown-menu{display:block;animation:dd .15s ease}
@keyframes dd{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}
.dropdown-menu button{display:block;width:100%;text-align:left;padding:8px 12px;border:none;background:none;font-size:13px;cursor:pointer;border-radius:6px;color:var(--tx);transition:background .1s}
.dropdown-menu button:hover{background:var(--pl)}
.dropdown-sep{height:1px;background:var(--bdl);margin:4px 0}

/* Editor common */
#editor{flex:1;display:flex;flex-direction:column;background:var(--bg);min-width:0}
.editor-empty{display:flex;align-items:center;justify-content:center;flex:1;flex-direction:column;gap:12px;color:var(--tm);font-size:14px}
.editor-panel{display:flex;flex-direction:column;flex:1;min-height:0;animation:fi .2s ease}
.ed-header{padding:8px 16px;display:flex;align-items:center;gap:8px;background:var(--sf);border-bottom:1px solid var(--bd);flex-shrink:0;flex-wrap:wrap}
.ed-header input[type=text]{flex:1;padding:8px 10px;border:2px solid transparent;border-radius:var(--rs);font-size:17px;font-weight:700;outline:none;background:transparent;min-width:120px;transition:all var(--t);color:var(--tx)}
.ed-header input[type=text]:focus{border-color:var(--p);background:var(--sf);box-shadow:0 0 0 3px var(--pg)}
.ed-actions{display:flex;align-items:center;gap:6px;flex-shrink:0;flex-wrap:wrap}
.sm-btn{padding:4px 10px;border:1px solid var(--bd);border-radius:6px;background:var(--sf);font-size:11px;cursor:pointer;color:var(--ts);transition:all var(--t);white-space:nowrap}
.sm-btn:hover{border-color:var(--p);color:var(--p)}
.sm-btn.ghost{border-style:dashed}
.sm-btn.ghost:hover{border-color:var(--dn);color:var(--dn)}
.muted{color:var(--tm)}.small{font-size:11px}
#save-status,#sheet-save-status{font-size:11px;padding:3px 8px;border-radius:12px;white-space:nowrap;transition:all .3s}
.ss-saving{background:rgba(234,179,8,.1);color:#ca8a04}
.ss-saved{background:rgba(34,197,94,.1);color:#16a34a}
.ss-err{background:rgba(239,68,68,.1);color:var(--dn)}

/* Text editor */
#note-content{flex:1;padding:20px 24px;border:none;resize:none;font-size:14px;line-height:1.8;outline:none;font-family:"SF Mono","Fira Code",Consolas,"Source Code Pro","PingFang SC","Microsoft YaHei",monospace;background:var(--sf);color:var(--tx);min-height:0;margin:12px 16px;border-radius:var(--r);box-shadow:0 1px 3px rgba(0,0,0,.06)}
#note-content:focus{box-shadow:0 4px 16px rgba(0,0,0,.08),0 0 0 2px var(--pg)}

/* Sheet editor */
.sheet-wrap{flex:1;overflow:auto;padding:12px 16px;-webkit-overflow-scrolling:touch}
.sheet-table{border-collapse:collapse;min-width:100%;background:var(--sf);border-radius:var(--rs);overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.sheet-table th,.sheet-table td{border:1px solid var(--bd);padding:0;text-align:left;position:relative}
.sheet-table th{background:#f8f9fb;font-size:11px;font-weight:600;color:var(--ts);padding:6px 10px;text-align:center;user-select:none;white-space:nowrap;position:sticky;top:0;z-index:2}
.sheet-table th.corner{width:36px;min-width:36px;z-index:3;background:#f0f1f3}
.sheet-table .row-hdr{background:#f8f9fb;font-size:11px;font-weight:600;color:var(--tm);text-align:center;width:36px;min-width:36px;padding:4px;user-select:none}
.sheet-table td .cell{width:100%;min-height:28px;padding:5px 8px;font-size:13px;outline:none;border:none;display:block;line-height:1.5;font-family:inherit}
.sheet-table td .cell:focus{background:rgba(99,102,241,.04);box-shadow:inset 0 0 0 2px var(--p)}
.sheet-table tr:first-child td .cell{font-weight:600;background:#fafafc}

/* Toast */
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(70px);background:var(--tx);color:#fff;padding:10px 20px;border-radius:10px;font-size:13px;font-weight:500;z-index:1000;opacity:0;transition:all .35s cubic-bezier(.16,1,.3,1);pointer-events:none;box-shadow:0 8px 32px rgba(0,0,0,.2)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Mobile */
.mobile-only{display:none!important}
.desk-only{display:inline}
#menu-btn{display:none}
@media(max-width:768px){
    .mobile-only{display:flex!important}
    .desk-only{display:none!important}
    .login-card{padding:32px 24px;margin:12px}
    header{height:48px;padding:0 10px}
    .hdr-widget{display:none}
    #sidebar{position:absolute;left:0;top:48px;bottom:0;width:100%;z-index:10;transition:transform .25s cubic-bezier(.16,1,.3,1)}
    #sidebar.hidden{transform:translateX(-100%);pointer-events:none}
    #editor{position:absolute;left:0;top:48px;bottom:0;width:100%;display:none;z-index:5}
    #editor.visible{display:flex}
    .main-content{position:relative}
    .hdr-right{gap:6px}
    #note-content{margin:8px;padding:14px;font-size:13px}
    .ed-header{padding:6px 10px}
    .ed-header input[type=text]{font-size:15px}
}

/* Scrollbar */
.notes-list::-webkit-scrollbar,.sheet-wrap::-webkit-scrollbar,#note-content::-webkit-scrollbar{width:5px;height:5px}
.notes-list::-webkit-scrollbar-thumb,.sheet-wrap::-webkit-scrollbar-thumb,#note-content::-webkit-scrollbar-thumb{background:var(--bd);border-radius:4px}
::selection{background:rgba(99,102,241,.2)}

/* Language selector */
.lang-sel{padding:4px 6px;border:1px solid var(--bd);border-radius:6px;font-size:11px;background:var(--sf);color:var(--ts);cursor:pointer;outline:none;transition:all var(--t);-webkit-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%239ca3af'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 6px center;padding-right:20px}
.lang-sel:hover{border-color:var(--p);color:var(--p)}
.lang-sel:focus{border-color:var(--p);box-shadow:0 0 0 2px var(--pg)}
.login-lang-sel{position:absolute;top:16px;right:16px;background:rgba(255,255,255,.8);border-color:rgba(0,0,0,.1)}