:root{--bg: #0e0f13;--bg-2: #14161c;--bg-3: #1b1e26;--surface: #191c24;--border: #282c37;--border-2: #343946;--text: #e9ebf2;--text-2: #a6adbd;--text-3: #6b7282;--accent: #6c8cff;--accent-hi: #8aa7ff;--accent-dim: rgba(108, 140, 255, .16);--ok: #4ade80;--warn: #fbbf24;--danger: #f87171;--radius: 10px;--mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, monospace}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Inter,sans-serif;font-size:14.5px;line-height:1.5}h1,h2,h3{margin:0 0 8px;font-weight:650}h1{font-size:22px}h2{font-size:18px}h3{font-size:15px}p{margin:0 0 10px}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hi)}button{font:inherit}.app-shell{display:flex;flex-direction:column;height:100%}.center-screen{display:grid;place-items:center;height:100%}.auth-screen{display:grid;place-items:center;height:100%;background:radial-gradient(600px circle at 20% 10%,rgba(108,140,255,.14),transparent 45%),var(--bg)}.auth-card{width:360px;max-width:92vw;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:28px 26px;box-shadow:0 18px 50px #00000073}.auth-logo{font-size:24px;letter-spacing:-.02em;background:linear-gradient(90deg,var(--accent-hi),#b79cff);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.auth-sub{color:var(--text-2);margin-bottom:18px}.form-error{color:var(--danger);font-size:13px;margin:6px 0 10px;background:#f8717114;border-radius:8px;padding:8px 10px}.link-btn{display:block;margin:14px auto 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18px}.modal-footer{display:flex;justify-content:flex-end;gap:8px;padding:0 18px 16px}.menu-wrap{position:relative;display:inline-flex}.menu{position:absolute;right:0;top:calc(100% + 6px);min-width:170px;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:0 14px 40px #00000080;z-index:40;padding:5px}.menu-item{display:block;width:100%;text-align:left;background:none;border:none;color:var(--text);padding:8px 12px;border-radius:7px;cursor:pointer;font-size:13.5px}.menu-item:hover{background:var(--bg-3)}.menu-item.danger{color:var(--danger)}.empty-state{text-align:center;padding:48px 20px;color:var(--text-2)}.empty-state h3{color:var(--text)}.empty-icon{font-size:34px;margin-bottom:10px}.toggle-row{display:inline-flex;align-items:center;gap:8px;cursor:pointer;color:var(--text-2)}.toggle-row 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860px){.app-tab-name{display:none}.app-tab{padding:7px}}.sheets-layout{display:flex;flex:1;min-height:0}.sheets-side{width:240px;border-right:1px solid var(--border);background:var(--bg-2);display:flex;flex-direction:column;overflow:hidden}.sheets-side-head{display:flex;align-items:center;justify-content:space-between;padding:16px 14px}.sheets-side-head h2{margin:0;font-size:15px}.book-list{flex:1;overflow-y:auto;padding:0 8px 12px}.book-row{display:block;width:100%;text-align:left;background:none;border:none;border-radius:8px;padding:9px 10px;cursor:pointer;color:var(--text)}.book-row:hover{background:var(--bg-3)}.book-row.active{background:var(--accent-dim)}.book-row-title{font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.book-row-meta{font-size:11.5px;color:var(--text-3)}.sheets-main{flex:1;min-width:0;overflow:auto}.sheet-view{display:flex;flex-direction:column;height:100%}.sheet-toolbar{padding:10px 16px;border-bottom:1px solid 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th{background:var(--bg-2);color:var(--text-2);font-weight:500;text-align:center;position:sticky}.grid thead th{top:0;z-index:2}.grid .corner{z-index:3}.grid .row-head{left:0;min-width:42px;max-width:42px;z-index:1;position:sticky;text-align:right;padding-right:8px}.grid td{cursor:cell}.grid td:hover{background:var(--bg-2)}.grid td.active{background:var(--accent-dim)}.tab-bar{display:flex;align-items:center;gap:6px;padding:8px 12px;border-top:1px solid var(--border);background:var(--bg-2)}.tab-pill{background:none;border:none;border-radius:8px;padding:6px 14px;color:var(--text-2);font-size:13px;cursor:pointer}.tab-pill.active{background:var(--bg-3);color:var(--text)}.tab-pill.add-tab{font-weight:700;color:var(--text-3)}