* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: #fff;
}

.container {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    animation: fadeIn 1s ease-in;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.stopwatch {
    padding: 20px;
}

#display {
    font-size: 3.5em;
    font-weight: bold;
    margin-bottom: 20px;
    background: rgba(0, 0, 0, 0.2);
    padding: 10px 20px;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

#display:hover {
    transform: scale(1.05);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

button {
    padding: 12px 24px;
    font-size: 1.1em;
    font-weight: bold;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    background: #ff6f61;
    color: #fff;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

button:hover:not(:disabled) {
    background: #ff3b2f;
    transform: translateY(-2px);
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.laps {
    max-height: 200px;
    overflow-y: auto;
    padding: 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-top: 20px;
    scrollbar-width: thin;
    scrollbar-color: #ff6f61 rgba(255, 255, 255, 0.1);
}

.laps::-webkit-scrollbar {
    width: 8px;
}

.laps::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.laps::-webkit-scrollbar-thumb {
    background: #ff6f61;
    border-radius: 10px;
}

.lap-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    margin: 5px 0;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.15);
    font-size: 1.1em;
    font-weight: 500;
    transition: all 0.3s ease;
    animation: slideIn 0.5s ease-in, pulse 0.3s ease-in;
}

.lap-item:nth-child(odd) {
    background: rgba(255, 255, 255, 0.25);
}

.lap-item:hover {
    transform: translateX(5px);
    background: rgba(255, 255, 255, 0.3);
}

.lap-item.fade-out {
    animation: fadeOut 0.5s ease-out forwards;
}

.lap-name {
    cursor: pointer;
    flex: 1;
    padding: 5px;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.lap-name:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lap-name input {
    background: transparent;
    border: none;
    color: #fff;
    font-size: 1.1em;
    font-weight: 500;
    padding: 5px;
    width: 100%;
    outline: none;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.lap-name input:focus {
    background: rgba(0, 0, 0, 0.3);
}

.lap-time {
    flex: 1;
    text-align: right;
}

.delete-btn {
    padding: 8px 12px;
    font-size: 0.9em;
    background: #e63946;
    border-radius: 15px;
    transition: all 0.3s ease;
    margin-left: 10px;
}

.delete-btn:hover {
    background: #d00000;
    transform: scale(1.1);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(20px); }
}

@media (max-width: 600px) {
    #display { font-size: 2.5em; }
    button { padding: 10px 20px; font-size: 1em; }
    h1 { font-size: 2em; }
    .lap-item { font-size: 1em; padding: 10px; }
    .delete-btn { padding: 6px 10px; font-size: 0.8em; }
}