:root{--bg-color:#0f172a;--text-primary:#f8fafc;--text-secondary:#94a3b8;--accent-color:#3b82f6;--timer-bg:#ef4444;--timer-text:#fff;--card-bg:#1e293b;--border-color:#334155;--hover-color:#2563eb}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);flex-direction:column;min-height:100vh;font-family:Inter,system-ui,-apple-system,sans-serif;display:flex}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;font-family:inherit;transition:all .2s}input,select{background-color:var(--bg-color);border:1px solid var(--border-color);color:var(--text-primary);border-radius:.5rem;outline:none;padding:.5rem 1rem;font-family:inherit}input:focus,select:focus{border-color:var(--accent-color);box-shadow:0 0 0 2px #3b82f633}.main-container{flex-direction:column;flex:1;width:100%;max-width:1200px;margin:0 auto;padding:2rem;display:flex}.nav{background-color:var(--card-bg);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:1rem 2rem;display:flex}.nav-links{gap:1rem;display:flex}.nav-link{color:var(--text-secondary);font-weight:500}.nav-link:hover,.nav-link.active{color:var(--text-primary)}.btn{background-color:var(--accent-color);color:#fff;border-radius:.5rem;padding:.75rem 1.5rem;font-weight:600}.btn:hover{background-color:var(--hover-color);transform:translateY(-1px)}.btn:active{transform:translateY(1px)}.btn-danger{background-color:#ef4444}.btn-danger:hover{background-color:#dc2626}.btn-outline{border:1px solid var(--border-color);background-color:#0000}.btn-outline:hover{background-color:var(--border-color)}.card{background-color:var(--card-bg);border:1px solid var(--border-color);border-radius:1rem;padding:2rem;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.timer-container{background:linear-gradient(135deg, var(--timer-bg), #dc2626);color:var(--timer-text);text-align:center;border-radius:2rem;margin-bottom:2rem;padding:4rem 2rem;transition:background .5s,box-shadow .5s;position:relative;overflow:hidden;box-shadow:0 20px 25px -5px #0003,0 10px 10px -5px #0000001a,inset 0 2px 4px #fff3}.timer-display{font-variant-numeric:tabular-nums;letter-spacing:-.02em;text-shadow:0 4px 10px #00000026;margin-bottom:2.5rem;font-size:8rem;font-weight:700;line-height:1}.timer-controls{justify-content:center;gap:1rem;display:flex}.timer-btn{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#fff;background-color:#ffffff26;border:1px solid #fff3;border-radius:3rem;padding:1rem 2.5rem;font-size:1.25rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 6px #0000001a}.timer-btn:hover{background-color:#ffffff40;transform:translateY(-2px);box-shadow:0 6px 12px #00000026}.timer-btn:active{transform:translateY(0)}.timer-config{justify-content:center;align-items:center;gap:1rem;margin-top:2rem;display:flex}.timer-config label{color:#ffffffe6;font-weight:500}.timer-config input{text-align:center;color:#fff;background-color:#ffffff1a;border:1px solid #ffffff4d;width:80px}.timer-config input:focus{box-shadow:none;border-color:#fff}.mode-tabs{justify-content:center;gap:.5rem;margin-bottom:2rem;display:flex}.mode-tab{color:#fff9;cursor:pointer;background:0 0;border:none;border-radius:2rem;padding:.5rem 1.25rem;font-size:1rem;font-weight:600;transition:all .3s cubic-bezier(.4,0,.2,1)}.mode-tab.active{color:#fff;background:#fff3}.mode-tab:hover:not(.active){color:#fff;background:#ffffff1a}.todo-list{flex-direction:column;gap:.5rem;max-height:300px;margin-top:1rem;display:flex;overflow-y:auto}.todo-item{background:var(--bg-color);border:1px solid var(--border-color);cursor:pointer;border-radius:.5rem;justify-content:space-between;align-items:center;padding:1rem;display:flex}.todo-item:hover{border-color:var(--text-secondary)}.todo-item.active-todo{border-left:4px solid var(--accent-color);background:#3b82f60d}.timer-container.mode-pomodoro{background:linear-gradient(135deg,#ef4444,#b91c1c);box-shadow:0 20px 25px -5px #ef444466,0 10px 10px -5px #ef444433,inset 0 2px 10px #fff3}.timer-container.mode-short{background:linear-gradient(135deg,#0ea5e9,#0369a1);box-shadow:0 20px 25px -5px #0ea5e966,0 10px 10px -5px #0ea5e933,inset 0 2px 10px #fff3}.timer-container.mode-long{background:linear-gradient(135deg,#3b82f6,#1d4ed8);box-shadow:0 20px 25px -5px #3b82f666,0 10px 10px -5px #3b82f633,inset 0 2px 10px #fff3}.stats-categories{flex-wrap:wrap;justify-content:center;gap:.5rem;margin-bottom:2rem;display:flex}.category-badge{background:#0003;border:1px solid;border-radius:.25rem;align-items:center;gap:.5rem;padding:.25rem .5rem;font-size:.75rem;font-weight:600;display:inline-flex}.stats-cards-row{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:.5rem;margin-bottom:2rem;display:grid}.stats-summary-card{color:#fff;border-radius:.5rem;align-items:center;gap:1rem;padding:1rem;display:flex}.stats-summary-card .icon{background:#fff3;border-radius:50%;justify-content:center;align-items:center;width:48px;height:48px;padding:.75rem;font-size:1.5rem;display:flex}.stats-summary-card .value{font-size:1.75rem;font-weight:800;line-height:1}.stats-summary-card .label{opacity:.9;text-transform:uppercase;font-size:.75rem;font-weight:600}.card-red{background-color:#d32f2f}.card-orange{background-color:#f57c00}.card-green{background-color:#388e3c}.card-purple{background-color:#7b1fa2}.history-item{border-bottom:1px solid #ffffff0d;justify-content:space-between;align-items:center;padding:.75rem 1rem;font-size:.875rem;display:flex}.history-item:hover{background:#ffffff05}.history-cat{flex:1;font-weight:500}.history-desc{color:var(--text-secondary);flex:2;font-style:italic}.history-meta{text-align:right;color:var(--text-secondary);flex:1;justify-content:flex-end;align-items:center;gap:1rem;display:flex}.history-meta strong{color:var(--text-primary)}@media (max-width:640px){.main-container{padding:1rem}.nav{flex-direction:column;gap:1rem;padding:1rem}.timer-container{padding:2rem 1rem}.timer-display{font-size:4rem}.timer-controls,.mode-tabs{flex-wrap:wrap}.todo-form{flex-direction:column!important}.todo-item{flex-direction:column;align-items:flex-start;gap:.75rem}.todo-item>div:last-child{justify-content:flex-end;width:100%}.history-item{flex-direction:column;align-items:flex-start;gap:.5rem}.history-meta{justify-content:space-between;width:100%}.stats-cards-row{grid-template-columns:1fr}}