* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: #eef2ff;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Poppins', sans-serif;
}

.stopwatch-card {
    position: relative;
    width: 420px;
    height: 260px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.card-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: url('[https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80](https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80)');
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.card-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(1px);
    z-index: 1;
}

.content {
    position: relative;
    z-index: 2;
    text-align: center;
    width: 100%;
}

.timer-display {
    font-family: 'Roboto Mono', monospace;
    font-size: 3.5rem;
    color: white;
    font-weight: 500;
    margin-bottom: 30px;
    font-variant-numeric: tabular-nums;
}

.milliseconds {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.7);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 25px;
}

.btn {
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
}

.btn:active { transform: scale(0.95); }

.btn-secondary {
    width: 45px; height: 45px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: white;
    transform: scale(1.1);
}

.btn-primary {
    width: 65px; height: 65px;
    border-radius: 50%;
    background-color: #ff5722;
    color: white;
    box-shadow: 0 4px 15px rgba(255, 87, 34, 0.4);
}

.btn-primary:hover {
    background-color: #f4511e;
    transform: scale(1.1);
}

svg {
    fill: currentColor;
    width: 20px; height: 20px;
}

.btn-primary svg { width: 28px; height: 28px; margin-left: 4px; }
.btn-primary.paused svg { margin-left: 0; }
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: #eef2ff;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Poppins', sans-serif;
}

.stopwatch-card {
    position: relative;
    width: 420px;
    height: 260px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.card-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: url('https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80](https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80)');
    background-size: cover;
    background-position: center;
    z-index: 0;
}

.card-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(1px);
    z-index: 1;
}

.content {
    position: relative;
    z-index: 2;
    text-align: center;
    width: 100%;
}

.timer-display {
    font-family: 'Roboto Mono', monospace;
    font-size: 3.5rem;
    color: white;
    font-weight: 500;
    margin-bottom: 30px;
    font-variant-numeric: tabular-nums;
}

.milliseconds {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.7);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 25px;
}

.btn {
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    justify-content: center;
    outline: none;
}

.btn:active { transform: scale(0.95); }

.btn-secondary {
    width: 45px; height: 45px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: white;
    transform: scale(1.1);
}

.btn-primary {
    width: 65px; height: 65px;
    border-radius: 50%;
    background-color: #ff5722;
    color: white;
    box-shadow: 0 4px 15px rgba(255, 87, 34, 0.4);
}

.btn-primary:hover {
    background-color: #f4511e;
    transform: scale(1.1);
}

svg {
    fill: currentColor;
    width: 20px; height: 20px;
}

.btn-primary svg { width: 28px; height: 28px; margin-left: 4px; }
.btn-primary.paused svg { margin-left: 0; }