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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

/* Header Styles */
.header {
    margin-bottom: 2rem;
}

.title {
    font-size: 2rem;
    font-weight: bold;
    color: #4a5568;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #718096;
    font-size: 0.9rem;
}

/* Session Info */
.session-info {
    margin-bottom: 2rem;
}

.session-type {
    font-size: 1.2rem;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.session-count {
    color: #718096;
    font-size: 0.9rem;
}

/* Timer Display */
.timer-display {
    margin-bottom: 2rem;
}

.timer-circle {
    width: 200px;
    height: 200px;
    border: 8px solid #e2e8f0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    position: relative;
    transition: border-color 0.3s ease;
}

.timer-circle.active {
    border-color: #667eea;
}

.timer-circle.break {
    border-color: #48bb78;
}

.timer-inner {
    text-align: center;
}

.time {
    font-size: 2.5rem;
    font-weight: bold;
    color: #4a5568;
    font-family: 'Courier New', monospace;
}

.status {
    color: #718096;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Control Buttons */
.controls {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 80px;
}

.btn-primary {
    background-color: #667eea;
    color: white;
}

.btn-primary:hover {
    background-color: #5a67d8;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #e2e8f0;
    color: #4a5568;
}

.btn-secondary:hover {
    background-color: #cbd5e0;
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Settings Panel */
.settings-panel {
    background-color: #f7fafc;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    text-align: left;
}

.settings-panel h3 {
    color: #4a5568;
    margin-bottom: 1rem;
    text-align: center;
}

.setting-item {
    margin-bottom: 1rem;
}

.setting-item:last-child {
    margin-bottom: 0;
    text-align: center;
    margin-top: 1.5rem;
}

.setting-item label {
    display: block;
    color: #4a5568;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.setting-item input {
    width: 100%;
    padding: 0.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-size: 1rem;
}

.setting-item input:focus {
    outline: none;
    border-color: #667eea;
}

/* Progress Indicator */
.progress-indicator {
    margin-top: 1rem;
}

.progress-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #e2e8f0;
    transition: background-color 0.3s ease;
}

.dot.active {
    background-color: #667eea;
}

.dot.completed {
    background-color: #48bb78;
}

/* Responsive Design */
@media (max-width: 480px) {
    .container {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .timer-circle {
        width: 150px;
        height: 150px;
    }
    
    .time {
        font-size: 2rem;
    }
    
    .controls {
        gap: 0.5rem;
    }
    
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
        min-width: 70px;
    }
}