/* Theme variables */
:root {
    /* Light theme (default) */
    --bg-color: #f5f5f5;
    --text-color: #333;
    --container-bg: #fff;
    --container-shadow: rgba(0, 0, 0, 0.1);
    --display-bg: #2c3e50;
    --display-text: #ecf0f1;
    --border-color: #eee;
    --lap-bg: #f9f9f9;
    --split-bg: #e8f4fc;
    --split-border: #3498db;
}

/* Dark theme */
body.dark-theme {
    --bg-color: #1a1a2e;
    --text-color: #e6e6e6;
    --container-bg: #16213e;
    --container-shadow: rgba(0, 0, 0, 0.3);
    --display-bg: #0f3460;
    --display-text: #ffffff;
    --border-color: #2a2a4a;
    --lap-bg: #1f2b46;
    --split-bg: #1a3a5f;
    --split-border: #3a7bd5;
}

/* Base styles and reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 90px 20px 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation and utility controls styles */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--container-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    display: flex;
    align-items: center;
    transition: text-shadow 0.3s ease;
}

.logo span {
    margin-left: 5px;
}


.utility-controls {
    display: flex;
    gap: 20px;
}

.theme-toggle, .fullscreen-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    padding: 10px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, background-color 0.3s ease;
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    position: relative;
}

.theme-toggle:hover, .fullscreen-toggle:hover {
    transform: scale(1.1);
    background-color: rgba(255, 255, 255, 0.3);
}

.theme-toggle:focus, .fullscreen-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--split-border);
}

body.dark-theme .theme-toggle, 
body.dark-theme .fullscreen-toggle {
    background-color: rgba(0, 0, 0, 0.2);
}

body.dark-theme .theme-toggle:hover, 
body.dark-theme .fullscreen-toggle:hover {
    background-color: rgba(0, 0, 0, 0.3);
}

.theme-icon, .fullscreen-icon {
    transition: opacity 0.3s ease, transform 0.3s ease;
}



.lap-segment, .lap-total {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.8;
    margin-left: 10px;
}

.dark-icon {
    display: inline;
}

.light-icon {
    display: none;
}

body.dark-theme .dark-icon {
    display: none;
}

body.dark-theme .light-icon {
    display: inline;
}

.enter-fullscreen,
.exit-fullscreen {
    font-size: 18px;
    color: var(--button-text);
    position: absolute;
    transition: opacity 0.3s, transform 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.enter-fullscreen i,
.exit-fullscreen i {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--text-color);
}

.enter-fullscreen {
    opacity: 1;
    transform: scale(1);
}

.exit-fullscreen {
    opacity: 0;
    transform: scale(0.8);
    visibility: hidden;
}

body.is-fullscreen .enter-fullscreen {
    opacity: 0;
    transform: scale(0.8);
    visibility: hidden;
}

body.is-fullscreen .exit-fullscreen {
    opacity: 1;
    transform: scale(1);
    visibility: visible;
}

/* Container styles */
.container {
    width: 100%;
    max-width: 500px;
    background-color: var(--container-bg);
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--container-shadow);
    padding: 25px;
    text-align: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

h1 {
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.8rem;
    transition: color 0.3s ease;
}

h2 {
    font-size: 1.3rem;
    margin: 20px 0 10px;
    color: var(--text-color);
    transition: color 0.3s ease;
}

/* Stopwatch display styles */
.stopwatch {
    margin-bottom: 20px;
}

.display {
    font-family: 'Roboto Mono', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    background-color: var(--display-bg);
    color: var(--display-text);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.3);
    letter-spacing: 2px;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease;
    animation: fadeIn 0.5s ease-out;
}

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

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.running .display {
    animation: pulse 2s infinite;
}

.countdown-mode .display {
    color: #e74c3c;
    animation: countdown-pulse 1.5s infinite;
}

@keyframes countdown-pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.03); box-shadow: 0 0 15px rgba(231, 76, 60, 0.5); }
    100% { transform: scale(1); }
}

/* Button styles */
.controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    background-color: #3498db;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn:active:not(:disabled) {
    transform: translateY(2px);
    box-shadow: 0 0 2px rgba(0, 0, 0, 0.1);
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn:focus {
    outline: 3px solid #74b9ff;
    outline-offset: 2px;
}

.btn:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
    transform: none;
}

/* Button specific colors */
#startBtn {
    background-color: #2ecc71;
}

#startBtn:hover {
    background-color: #27ae60;
}

#pauseBtn {
    background-color: #f39c12;
}

#pauseBtn:hover {
    background-color: #d35400;
}

#resetBtn {
    background-color: #e74c3c;
}

#resetBtn:hover {
    background-color: #c0392b;
}

#lapBtn {
    background-color: #9b59b6;
}

#lapBtn:hover {
    background-color: #8e44ad;
}

#splitBtn {
    background-color: #3498db;
}

#splitBtn:hover {
    background-color: #2980b9;
}

/* Keyboard shortcut display */
.shortcut {
    font-size: 0.8rem;
    opacity: 0.8;
    margin-left: 8px;
}

/* Timer presets styles */
.presets-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 20px;
}

.preset-btn {
    padding: 8px 12px;
    background-color: var(--display-bg);
    color: var(--display-text);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.2s, background-color 0.3s, box-shadow 0.3s;
    position: relative;
}

.preset-btn:hover {
    transform: translateY(-2px);
    background-color: var(--split-border);
}

.preset-btn:focus {
    outline: 2px solid var(--split-border);
}

.preset-btn.active {
    background-color: var(--split-border);
    box-shadow: 0 0 8px var(--split-border);
}

.preset-btn.active::after {
    content: '✓';
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: #27ae60;
    color: white;
    border-radius: 50%;
    width: 16px;
    height: 16px;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Laps list styles */
.laps-container {
    text-align: left;
}

.lap-times-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.export-controls {
    position: relative;
}

.export-btn {
    background-color: var(--display-bg);
    color: var(--display-text);
    border: none;
    border-radius: 5px;
    padding: 8px 12px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.export-btn:hover {
    background-color: var(--split-border);
    transform: translateY(-2px);
}

.export-dropdown {
    position: absolute;
    right: 0;
    top: 100%;
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: none;
    flex-direction: column;
    z-index: 10;
    min-width: 100px;
}

.export-dropdown.show {
    display: flex;
}

.export-option {
    padding: 8px 12px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    color: var(--text-color);
    transition: background-color 0.2s ease;
}

.export-option:hover {
    background-color: var(--lap-bg);
}

.laps-list {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 10px;
    background-color: var(--lap-bg);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.lap-item {
    padding: 8px 10px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.3s ease;
}

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

.split-item {
    background-color: var(--split-bg);
    border-left: 3px solid var(--split-border);
    transition: background-color 0.3s ease, border-left-color 0.3s ease;
}

.lap-number {
    font-weight: bold;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.lap-time {
    font-family: 'Roboto Mono', monospace;
    color: var(--text-color);
    transition: color 0.3s ease;
}

/* Responsive styles for larger screens */
@media (min-width: 768px) {
    .container {
        padding: 30px;
    }

    h1 {
        font-size: 2.2rem;
    }

    .display {
        font-size: 3rem;
    }

    .controls {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .btn {
        flex: 1;
        min-width: 120px;
        max-width: 200px;
    }

    .laps-list {
        max-height: 250px;
    }
    
    .export-btn {
        padding: 10px 15px;
        font-size: 1rem;
    }
}

/* Mobile-specific styles */
@media (max-width: 767px) {
    .lap-times-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .export-controls {
        align-self: flex-end;
    }
    
    .export-dropdown {
        right: 0;
    }
}