:root{--bg:oklch(96% .007 65);--bg2:oklch(93% .009 65);--paper:oklch(99.5% .003 65);--text:oklch(22% .01 65);--text-mid:oklch(50% .01 65);--text-soft:oklch(68% .008 65);--border:oklch(88% .008 65);--accent:oklch(52% .18 255);--accent-soft:oklch(94% .04 255);--danger:oklch(52% .2 20);--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--shadow-sm:0 1px 3px oklch(0% 0 0/.06), 0 1px 2px oklch(0% 0 0/.04);--shadow-md:0 4px 16px oklch(0% 0 0/.08), 0 1px 4px oklch(0% 0 0/.04);--shadow-lg:0 12px 40px oklch(0% 0 0/.12), 0 4px 12px oklch(0% 0 0/.06);--font:"DM Sans", system-ui, -apple-system, sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg);width:100%;height:100%;font-family:var(--font);color:var(--text);-webkit-font-smoothing:antialiased;overflow:hidden}#root{width:100%;height:100%}.app{flex-direction:column;height:100%;display:flex}button{font-family:var(--font);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;display:flex}button:disabled{opacity:.38;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff;border-radius:var(--radius-sm);letter-spacing:-.01em;white-space:nowrap;padding:10px 18px;font-size:14px;font-weight:500;transition:opacity .15s,transform .1s}.btn-primary:hover:not(:disabled){opacity:.9}.btn-primary:active:not(:disabled){transform:scale(.97)}.btn-ghost{background:var(--bg2);color:var(--text);border-radius:var(--radius-sm);padding:10px 18px;font-size:14px;font-weight:500;transition:background .15s}.btn-ghost:hover:not(:disabled){background:var(--border)}.btn-danger{background:var(--danger);color:#fff;border-radius:var(--radius-sm);padding:10px 18px;font-size:14px;font-weight:500;transition:opacity .15s}.btn-danger:hover:not(:disabled){opacity:.88}.home-screen{flex-direction:column;height:100%;display:flex;overflow:hidden}.home-header{border-bottom:1px solid 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32px;overflow-y:auto}.section-label{color:var(--text-soft);text-transform:uppercase;letter-spacing:.06em;margin-top:4px;margin-bottom:12px;font-size:12px;font-weight:500}.notebooks-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;display:grid}@media (width>=768px){.notebooks-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}}.notebook-card{background:var(--paper);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border);cursor:pointer;-webkit-user-select:none;user-select:none;flex-direction:column;transition:transform .18s,box-shadow .18s;display:flex;position:relative;overflow:hidden}.notebook-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.notebook-card:active{transform:scale(.98)}.notebook-card-cover{background:var(--nb-color,#e8e0f5);flex-shrink:0;height:140px;display:flex;position:relative;overflow:hidden}.notebook-card-spine{background:oklch(from var(--nb-color,#e8e0f5) calc(l - .08) c 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var(--border);background:var(--bg);flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:12px 20px;display:flex}.btn-back{color:var(--accent);border-radius:var(--radius-sm);white-space:nowrap;align-items:center;gap:4px;padding:8px 4px;font-size:15px;font-weight:500;transition:opacity .15s;display:flex}.btn-back:hover{opacity:.75}.notebook-title-btn{border-radius:var(--radius-sm);background:0 0;flex:1;justify-content:center;align-items:center;gap:6px;min-width:0;padding:8px 12px;transition:background 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var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:300;min-width:200px;animation:.15s popIn;position:absolute;top:calc(100% + 8px);right:0;overflow:hidden}.user-menu-info{padding:12px 16px 10px}.user-menu-name{color:var(--text);font-size:14px;font-weight:600}.user-menu-email{color:var(--text-soft);margin-top:2px;font-size:12px}.auth-root{background:var(--bg);justify-content:center;align-items:center;min-height:100%;padding:24px;display:flex;position:relative;overflow:hidden}.auth-bg-pattern{pointer-events:none;background-image:radial-gradient(circle at 15% 15%,oklch(88% .04 255/.6) 0%,#0000 45%),radial-gradient(circle at 85% 85%,oklch(90% .025 65/.5) 0%,#0000 45%),radial-gradient(circle at 80% 20%,oklch(92% .03 300/.3) 0%,#0000 35%);position:absolute;inset:0}.auth-card{background:var(--paper);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:1;width:100%;max-width:420px;padding:40px 36px;animation:.25s cubic-bezier(.16,1,.3,1) slideUp;position:relative}.auth-logo-row{align-items:center;gap:10px;margin-bottom:32px;display:flex}.auth-app-name{letter-spacing:-.03em;color:var(--text);font-size:20px;font-weight:700}.auth-heading{letter-spacing:-.03em;color:var(--text);margin-bottom:6px;font-size:24px;font-weight:700}.auth-sub{color:var(--text-soft);margin-bottom:28px;font-size:14px;line-height:1.5}.auth-form{flex-direction:column;gap:16px;display:flex}.auth-field{flex-direction:column;gap:6px;display:flex}.auth-label{color:var(--text-mid);font-size:13px;font-weight:500}.auth-input-wrap{border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);align-items:center;transition:border-color .15s,box-shadow .15s;display:flex;position:relative}.auth-input-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px oklch(52% .18 255/.1)}.auth-input-wrap.error{border-color:var(--danger)}.auth-input-wrap.error:focus-within{box-shadow:0 0 0 3px oklch(52% .2 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solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:18px;height:18px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.auth-switch{text-align:center;color:var(--text-soft);margin-top:22px;font-size:14px}.auth-link{color:var(--accent);cursor:pointer;background:0 0;border:none;padding:0;font-size:14px;font-weight:500;transition:opacity .15s}.auth-link:hover{opacity:.75}.auth-success{text-align:center;flex-direction:column;align-items:center;padding:8px 0;display:flex}.auth-success-icon{margin-bottom:8px}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}