:root {
    /* Soft Pink + Warm Beige */
    --primary-color: #d46a6a;   /* Muted Rose Pink */
    --secondary-color: #b08968; /* Warm Mocha */
    --accent-color: #e5989b;    /* Soft Coral Pink */
    --text-color: #3e2723;      /* Dark Brown Text */
    --bg-color: #fdf6f6;        /* Blush-Tinted Background */
    --panel-color: #fffaf7;     /* Creamy White Panels */
    --border-color: #f0d9d9;    /* Light Pinkish Border */
    --shadow-color: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
    /* Dark Cocoa + Rose Gold Accents */
    --primary-color: #ff99ac;   /* Bright Rose Pink */
    --secondary-color: #a47148; /* Cocoa Brown */
    --accent-color: #f6c1c1;    /* Pale Pink */
    --text-color: #f5e6e6;      /* Soft Cream Text */
    --bg-color: #2b1d1d;        /* Deep Brown Background */
    --panel-color: #3c2e2e;     /* Slightly Lighter Brown Panels */
    --border-color: #5a3f3f;    /* Subtle Brown Border */
    --shadow-color: rgba(0, 0, 0, 0.4);
}

[data-theme="professional"] {
    /* Elegant Pink + Chocolate Accents */
    --primary-color: #c97b7b;   /* Dusty Rose */
    --secondary-color: #8b5e3c; /* Rich Chocolate */
    --accent-color: #e6b8b8;    /* Light Pink Highlight */
    --text-color: #4a2c2a;      /* Deep Brown Text */
    --bg-color: #faf5f5;         /* Soft Pink-White Background */
    --panel-color: #ffffff;     /* White Panels */
    --border-color: #e4cfcf;    /* Pale Pink Border */
    --shadow-color: rgba(0, 0, 0, 0.12);
}


* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.theme-switcher {
    display: flex;
    gap: 10px;
}

.theme-btn {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    background-color: var(--panel-color);
    color: var(--text-color);
    cursor: pointer;
    font-weight: 500;
    box-shadow: 0 2px 5px var(--shadow-color);
}

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

.stopwatch-display {
    background-color: var(--panel-color);
    border-radius: 10px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px var(--shadow-color);
    text-align: center;
}

.time-display {
    font-size: 4rem;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.control-btn {
    padding: 12px 25px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    min-width: 100px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

#start-btn {
    background-color: var(--secondary-color);
    color: white;
}

#pause-btn {
    background-color: var(--accent-color);
    color: white;
}

#reset-btn, #lap-btn {
    background-color: var(--panel-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.features-panel {
    background-color: var(--panel-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.feature-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.feature-tab {
    padding: 15px 25px;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-color);
    position: relative;
}

.feature-tab.active {
    color: var(--primary-color);
}

.feature-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
}

.tab-content {
    padding: 25px;
    display: none;
}

.tab-content.active {
    display: block;
}

.lap-list {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.lap-header {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    padding: 10px 15px;
    font-weight: 600;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.lap-item {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
}

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

.lap-item.highlight {
    background-color: rgba(66, 133, 244, 0.1);
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.stat-card h4 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.stat-card p {
    font-size: 1.2rem;
    font-weight: 600;
}

.setting-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
}

.setting-option:last-child {
    border-bottom: none;
}

.setting-option label {
    font-weight: 500;
}

.setting-option select, .setting-option input[type="checkbox"] {
    padding: 8px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background-color: var(--panel-color);
    color: var(--text-color);
}

footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-color);
    opacity: 0.8;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .time-display {
        font-size: 3rem;
    }
    
    .controls {
        gap: 10px;
    }
    
    .control-btn {
        padding: 10px 15px;
        min-width: 80px;
    }
    
    header {
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .time-display {
        font-size: 2.5rem;
    }
    
    .feature-tabs {
        flex-wrap: wrap;
    }
    
    .feature-tab {
        flex: 1 0 auto;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}