*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4a90e2;--primary-hover: #357abd;--secondary-color: #95a5a6;--secondary-hover: #7f8c8d;--background: #f5f7fa;--surface: #ffffff;--text-primary: #2c3e50;--text-secondary: #7f8c8d;--border-color: #e1e8ed;--success-color: #27ae60;--shadow: 0 2px 8px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .15)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:#faf8f3;min-height:100vh;padding-top:60px;padding-bottom:20px;color:var(--text-primary)}.top-nav{position:fixed;top:0;left:0;right:0;z-index:100;background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid #e5e7eb;padding:12px 20px}.nav-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.nav-logo{display:flex;align-items:center;text-decoration:none;color:#1f2937;font-weight:600;font-size:18px;transition:opacity .2s ease}.nav-logo:hover{opacity:.8}.nav-logo img{width:32px;height:32px;border-radius:50%;margin-right:8px}.nav-links{display:flex;gap:20px;align-items:center}.nav-link{color:#6b7280;text-decoration:none;font-size:14px;transition:color .2s ease}.nav-link:hover{color:#0b84ff}@media (max-width: 640px){.nav-links{gap:12px}.nav-link{font-size:13px}.nav-logo{font-size:16px}.nav-logo img{width:28px;height:28px}}.container{background:var(--surface);border-radius:24px;box-shadow:var(--shadow-lg);padding:40px;max-width:600px;width:100%;margin:0 auto;animation:fadeIn .5s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.app-header{text-align:center;margin-bottom:40px}.app-title{font-size:2.5rem;font-weight:700;color:var(--text-primary);margin-bottom:8px}.app-description{font-size:1rem;color:var(--text-secondary)}.timer-display{display:flex;justify-content:center;margin-bottom:40px}.time-circle{position:relative;width:200px;height:200px}.progress-ring{transform:rotate(-90deg)}.progress-ring-circle{transition:stroke-dashoffset .3s ease;stroke-linecap:round}.time-content{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center}.time-text{font-size:2.5rem;font-weight:700;color:var(--text-primary);font-variant-numeric:tabular-nums;line-height:1.2;cursor:pointer;-webkit-user-select:none;user-select:none;transition:opacity .2s ease}.time-text:hover{opacity:.7}.status-text{font-size:.9rem;color:var(--text-secondary);margin-top:8px;font-weight:500}.controls{display:flex;flex-direction:column;gap:32px}.section-title{font-size:1.1rem;font-weight:600;color:var(--text-primary);margin-bottom:16px}.preset-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:12px}.preset-btn{padding:14px 20px;background:var(--surface);border:2px solid var(--border-color);border-radius:12px;font-size:1rem;font-weight:500;color:var(--text-primary);cursor:pointer;transition:all .2s ease;font-family:inherit}.preset-btn:hover{border-color:var(--primary-color);background:#f0f7ff;transform:translateY(-2px);box-shadow:var(--shadow)}.preset-btn:active{transform:translateY(0)}.input-group{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.input-field{flex:1;min-width:120px;padding:14px 16px;border:2px solid var(--border-color);border-radius:12px;font-size:1rem;font-family:inherit;transition:all .2s ease}.input-field:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #4a90e21a}.input-label{font-size:1rem;color:var(--text-secondary);font-weight:500;white-space:nowrap}.input-hint{font-size:.85rem;color:var(--text-secondary);margin-top:8px;text-align:center;font-style:italic}.timer-controls{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.btn{padding:14px 28px;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;font-family:inherit;min-width:100px}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--secondary-color);color:#fff}.btn-secondary:hover{background:var(--secondary-hover);transform:translateY(-2px);box-shadow:var(--shadow)}.btn-secondary:active{transform:translateY(0)}.btn-small{padding:8px 16px;font-size:.9rem;min-width:auto}.sound-settings{margin-top:24px;padding:16px;background:#f9fafb;border-radius:12px;border:1px solid var(--border-color)}.sound-toggle{display:flex;align-items:center;gap:12px;cursor:pointer;-webkit-user-select:none;user-select:none}.sound-toggle input[type=checkbox]{width:20px;height:20px;cursor:pointer;accent-color:var(--primary-color)}.toggle-label{font-size:.95rem;color:var(--text-primary);font-weight:500}.notification-status{margin-top:24px;padding:16px;background:#fff3cd;border:2px solid #ffc107;border-radius:12px;text-align:center}.notification-status p{color:#856404;margin-bottom:12px;font-size:.95rem}.hidden{display:none!important}@media (max-width: 640px){.container{padding:24px}.app-title{font-size:2rem}.time-circle{width:180px;height:180px}.time-text{font-size:2rem}.preset-grid{grid-template-columns:repeat(2,1fr)}.input-group{flex-direction:column;align-items:stretch}.input-field{width:100%}.timer-controls{flex-direction:column}.btn{width:100%}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.timer-finished .time-text{animation:pulse 1s ease-in-out infinite;color:var(--success-color)}