:root {
    --primary-bg: #000000;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --accent: #007AFF;
    --danger: #FF3B30;
    --success: #34C759;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1a1a, #000000);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.container {
    position: relative;
    width: 100%;
    max-width: 600px;
    padding: 20px;
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.clock-container {
    padding: 40px;
    text-align: center;
    transition: all 0.3s ease;
}

.time {
    font-size: 3.5rem;
    font-weight: 300;
    margin-bottom: 30px;
    letter-spacing: 1px;
}

.timer {
    margin: 30px 0;
}

.timer-display {
    font-size: 5rem;
    font-weight: 300;
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.timer-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

.mode-indicator {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-top: 20px;
}

.settings-btn {
    position: absolute;
    top: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.settings-btn:hover {
    transform: rotate(45deg);
}

.settings-panel {
    position: absolute;
    top: 90px;
    right: 30px;
    width: 280px;
    padding: 20px;
    transition: all 0.3s ease;
    opacity: 1;
    transform: translateY(0);
}

.settings-panel.hidden {
    opacity: 0;
    transform: translateY(-20px);
    pointer-events: none;
}

.settings-panel h2 {
    margin-bottom: 15px;
    font-weight: 400;
    font-size: 1.1rem;
}

.setting-group {
    margin-bottom: 12px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    align-items: center;
    gap: 10px;
}

.setting-group label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.setting-group input[type="number"] {
    width: 100%;
    padding: 6px 8px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.setting-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    justify-self: start;
}

.time-format-select {
    width: 100%;
    padding: 6px 8px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

.time-format-select option {
    background: #1a1a1a;
    color: var(--text-primary);
}

.save-btn {
    width: 100%;
    padding: 8px;
    background: var(--accent);
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 15px;
}

.save-btn:hover {
    background: #0066CC;
}

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

.timer.active .timer-display {
    animation: pulse 2s infinite;
    color: var(--accent);
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .clock-container {
        padding: 30px 20px;
    }
    
    .time {
        font-size: 2.5rem;
    }
    
    .timer-display {
        font-size: 4rem;
    }
    
    .settings-panel {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 85%;
        max-width: 280px;
    }
    
    .settings-panel.hidden {
        transform: translate(-50%, -60%);
    }

    .setting-group {
        grid-template-columns: 1.5fr 1fr;
    }

    .setting-group label {
        font-size: 0.85rem;
    }
}