/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Y2K-inspired color palette */
    --primary: #2196F3;
    --success: #4CAF50;
    --warning: #FFC107;
    --danger: #F44336;
    --accent: #9C27B0;
    
    /* Theme colors - Light */
    --bg-primary: #f0f0ff;
    --bg-secondary: #e0e0ff;
    --text-primary: #303050;
    --text-secondary: #505070;
    --shadow-color: rgba(0, 0, 255, 0.2);
    --border-color: rgba(100, 100, 255, 0.3);
    
    /* Fonts */
    --font-display: 'Orbitron', sans-serif;
    --font-text: 'VT323', monospace;
    
    /* Sizing */
    --border-radius: 12px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2.5rem;
}

.dark-theme {
    --bg-primary: #202040;
    --bg-secondary: #303060;
    --text-primary: #e0e0ff;
    --text-secondary: #b0b0d0;
    --shadow-color: rgba(100, 100, 255, 0.4);
    --border-color: rgba(150, 150, 255, 0.3);
}

body {
    font-family: var(--font-text);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Header Styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.title {
    font-family: var(--font-display);
    font-size: 1.8rem;
    text-align: center;
    color: var(--primary);
    text-shadow: 2px 2px 0 var(--shadow-color);
    letter-spacing: 2px;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, background-color 0.3s ease;
    background-color: var(--bg-secondary);
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    transform: rotate(15deg);
    background-color: var(--border-color);
}

/* Stopwatch Display */
.stopwatch-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stopwatch-display {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 8px 16px var(--shadow-color), 
                inset 0 0 0 2px var(--border-color);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.stopwatch-display::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--warning));
    opacity: 0.7;
}

.time {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--primary);
    text-shadow: 0 0 10px rgba(33, 150, 243, 0.5);
    letter-spacing: 2px;
}

/* Controls */
.controls {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.btn {
    font-family: var(--font-display);
    padding: var(--spacing-md) var(--spacing-sm);
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 8px var(--shadow-color);
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-start {
    background-color: var(--success);
    color: white;
}

.btn-pause {
    background-color: var(--warning);
    color: var(--text-primary);
}

.btn-lap {
    background-color: var(--primary);
    color: white;
}

.btn-reset {
    background-color: var(--danger);
    color: white;
}

/* Laps Section */
.laps-container {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.laps-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent);
    text-align: center;
    letter-spacing: 2px;
}

.laps-list {
    max-height: 200px;
    overflow-y: auto;
    border-radius: var(--border-radius);
    background-color: var(--bg-primary);
    padding: var(--spacing-sm);
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--bg-secondary);
}

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

.laps-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.laps-list::-webkit-scrollbar-thumb {
    background-color: var(--primary);
    border-radius: var(--border-radius);
}

.lap-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-text);
    font-size: 1.1rem;
}

.lap-item:last-child {
    border-bottom: none;
}

.lap-number {
    color: var(--accent);
    font-weight: bold;
}

.lap-time {
    color: var(--text-secondary);
}

.empty-laps {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-secondary);
    font-style: italic;
}

/* Keyboard Shortcuts */
.keyboard-shortcuts {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.shortcut {
    display: inline-block;
    padding: 2px 6px;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    margin: 0 2px;
    font-family: var(--font-display);
}

/* Footer */
footer {
    margin-top: var(--spacing-xl);
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    width: 100%;
}

footer a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* Animations */
@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.03);
    }
    100% {
        transform: scale(1);
    }
}

.pulse {
    animation: pulse 1s infinite;
}

/* Responsive Design */
@media (max-width: 480px) {
    .title {
        font-size: 1.4rem;
    }
    
    .time {
        font-size: 2rem;
    }
    
    .controls {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: var(--spacing-md);
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .time {
        font-size: 2.2rem;
    }
}

/* Highlight for newest lap */
.lap-item.highlight {
    background-color: rgba(156, 39, 176, 0.1);
    animation: fadeIn 1s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}