:root{--primary: #3b82f6;--primary-dark: #2563eb;--bg: #f8fafc;--card: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-secondary: #64748b;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--radius: 12px;--spacing: 16px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}.app{min-height:100vh;display:flex;flex-direction:column;max-width:600px;margin:0 auto;background:var(--card)}.app-header{position:sticky;top:0;background:var(--card);border-bottom:1px solid var(--border);padding:var(--spacing);display:flex;justify-content:space-between;align-items:center;z-index:10}.app-header h1{font-size:1.25rem;cursor:pointer}.active-timer{display:flex;align-items:center;gap:8px;padding:8px 12px;background:var(--primary);color:#fff;border-radius:var(--radius);cursor:pointer;font-size:.875rem}.timer-pulse{animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.app-main{flex:1;overflow-y:auto;padding-bottom:80px}.onboarding{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--spacing);background:linear-gradient(135deg,#667eea,#764ba2)}.onboarding-card{background:var(--card);border-radius:var(--radius);padding:2rem;max-width:400px;width:100%;text-align:center;box-shadow:var(--shadow-lg)}.onboarding-logo{font-size:4rem;margin-bottom:1rem}.onboarding-card h1{font-size:1.75rem;margin-bottom:.5rem}.onboarding-card p{color:var(--text-secondary);margin-bottom:1.5rem}.onboarding-actions{display:flex;flex-direction:column;gap:12px}.home{padding:var(--spacing)}.home h2{font-size:1.25rem;margin-bottom:1rem}.quick-actions{margin-bottom:2rem}.activity-grid{display:flex;flex-direction:column;gap:1.5rem}.activity-category h3{font-size:.875rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.75rem}.activity-buttons{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:12px}.activity-btn{display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px 8px;border:none;border-radius:var(--radius);color:#fff;font-weight:500;cursor:pointer;transition:transform .2s;position:relative}.activity-btn:active{transform:scale(.95)}.activity-btn.active{animation:pulse 2s infinite}.activity-icon{font-size:2rem}.activity-label{font-size:.75rem}.timer-badge{position:absolute;top:4px;right:4px;font-size:.875rem}.recent-activities h2{margin-bottom:1rem}.activity-list{display:flex;flex-direction:column;gap:12px}.activity-item{display:flex;align-items:center;gap:12px;padding:12px;background:var(--bg);border-radius:var(--radius)}.activity-item .activity-icon{font-size:1.5rem}.activity-details{flex:1}.activity-title{font-weight:500;margin-bottom:4px}.activity-meta{font-size:.875rem;color:var(--text-secondary)}.activity-actions{display:flex;gap:8px}.btn-icon{background:none;border:none;font-size:1.25rem;cursor:pointer;padding:4px;opacity:.7;transition:opacity .2s}.btn-icon:hover{opacity:1}.empty-state{text-align:center;color:var(--text-secondary);padding:2rem}.history{padding:var(--spacing)}.history h2{font-size:1.25rem;margin-bottom:1rem}.history-groups{display:flex;flex-direction:column;gap:1.5rem}.history-day{font-size:.875rem;color:var(--text-secondary);margin-bottom:.75rem}.stats{padding:var(--spacing)}.stats h2{font-size:1.25rem;margin-bottom:1rem}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:2rem}.stat-card{background:var(--bg);border-radius:var(--radius);padding:1rem;text-align:center}.stat-icon{font-size:2rem;margin-bottom:.5rem}.stat-value{font-size:2rem;font-weight:600;margin-bottom:.25rem}.stat-label{font-size:.875rem;color:var(--text-secondary)}.stat-detail{font-size:.75rem;color:var(--text-secondary);margin-top:.25rem}.stats-breakdown{margin-top:2rem}.stats-breakdown h3{font-size:1rem;margin-bottom:1rem}.breakdown-list{display:flex;flex-direction:column;gap:8px}.breakdown-item{display:flex;align-items:center;gap:12px;padding:12px;background:var(--bg);border-radius:var(--radius)}.breakdown-icon{font-size:1.5rem}.breakdown-label{flex:1}.breakdown-count{font-weight:600;color:var(--primary)}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--card);border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:8px;max-width:600px;margin:0 auto}.nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 16px;background:none;border:none;color:var(--text-secondary);cursor:pointer;transition:color .2s}.nav-item.active{color:var(--primary)}.nav-icon{font-size:1.5rem}.nav-label{font-size:.75rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;padding:var(--spacing);z-index:100}.modal{background:var(--card);border-radius:var(--radius);width:100%;max-width:500px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg)}.modal-small{max-width:350px}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing);border-bottom:1px solid var(--border)}.modal-header h2{font-size:1.25rem}.modal-close{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text-secondary)}.modal-body{padding:var(--spacing)}.modal-actions{display:flex;gap:12px;margin-top:1.5rem}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.5rem}.input{width:100%;padding:12px;border:1px solid var(--border);border-radius:var(--radius);font-size:1rem;font-family:inherit}.input:focus{outline:none;border-color:var(--primary)}textarea.input{resize:vertical}.radio-group{display:flex;gap:16px}.radio-group label{display:flex;align-items:center;gap:8px;font-weight:400}.btn{padding:12px 24px;border:none;border-radius:var(--radius);font-size:1rem;font-weight:500;cursor:pointer;transition:background .2s;flex:1}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--bg);color:var(--text)}.btn-secondary:hover{background:var(--border)}