/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

#app {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* Header */
.header-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    text-align: center;
}

.header-icon {
    font-size: 48px;
    color: #2196F3;
    margin-bottom: 8px;
}

.app-title {
    font-size: 28px;
    font-weight: 700;
    color: #2196F3;
    margin-bottom: 8px;
}

.app-subtitle {
    font-size: 16px;
    color: rgba(33, 150, 243, 0.8);
    font-weight: 400;
}

/* Screens */
.screen {
    transition: all 0.3s ease;
}

.hidden {
    display: none !important;
}

/* Welcome Card */
.welcome-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.welcome-icon {
    font-size: 40px;
    color: #2196F3;
    margin-bottom: 12px;
}

.welcome-title {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.welcome-subtitle {
    font-size: 14px;
    color: rgba(51, 51, 51, 0.7);
    line-height: 1.5;
}

/* Input Cards */
.input-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.input-row {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.input-icon {
    font-size: 20px;
    color: #2196F3;
    margin-right: 12px;
}

.input-label {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.date-time-button {
    width: 100%;
    padding: 12px 16px;
    background: rgba(33, 150, 243, 0.1);
    border: 2px solid rgba(33, 150, 243, 0.3);
    border-radius: 8px;
    font-size: 16px;
    color: #2196F3;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.date-time-button:hover {
    background: rgba(33, 150, 243, 0.2);
    border-color: #2196F3;
}

/* Start Button */
.start-button {
    width: 100%;
    height: 56px;
    background: #2196F3;
    border: none;
    border-radius: 16px;
    color: white;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 16px rgba(33, 150, 243, 0.3);
}

.start-button:hover {
    background: #1976D2;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(33, 150, 243, 0.4);
}

/* Reset Button */
.reset-row {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 16px;
}

.reset-button {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 8px 16px;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
}

.reset-button:hover {
    background: #f5f5f5;
    border-color: #ccc;
}

/* Age Card */
.age-card {
    background: #2196F3;
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 8px 32px rgba(33, 150, 243, 0.3);
    color: white;
}

.age-title {
    font-size: 24px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
}

.age-values {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.age-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
}

.age-label {
    font-size: 16px;
    font-weight: 500;
    opacity: 0.9;
}

.age-value {
    font-size: 20px;
    font-weight: 700;
    min-width: 60px;
    text-align: right;
}

/* Stats Row */
.stats-row {
    display: flex;
    flex-direction: row;
    gap: 16px;
    margin-bottom: 16px;
}

.stat-card {
    flex: 1 1 0;
    min-width: 0;
    background: #009688;
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    color: white;
    box-shadow: 0 4px 16px rgba(0, 150, 136, 0.3);
}

.stat-icon {
    font-size: 24px;
    margin-bottom: 8px;
    opacity: 0.9;
}

.stat-title {
    font-size: 12px;
    font-weight: 500;
    opacity: 0.8;
    display: block;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 18px;
    font-weight: 700;
    display: block;
}

/* Birth Info Card */
.birth-info-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.birth-info-header {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.birth-icon {
    font-size: 20px;
    color: #2196F3;
    margin-right: 8px;
}

.birth-info-title {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.birth-text {
    font-size: 16px;
    color: #333;
    margin-bottom: 4px;
}

.birth-text:last-child {
    color: rgba(51, 51, 51, 0.7);
    margin-bottom: 0;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    border-radius: 16px;
    padding: 24px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
}

.close-button {
    background: none;
    border: none;
    font-size: 24px;
    color: #666;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.close-button:hover {
    background: #f5f5f5;
}

.modal-body {
    margin-bottom: 20px;
}

.date-input, .time-input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.date-input:focus, .time-input:focus {
    outline: none;
    border-color: #2196F3;
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.confirm-button, .cancel-button {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.confirm-button {
    background: #2196F3;
    color: white;
}

.confirm-button:hover {
    background: #1976D2;
}

.cancel-button {
    background: #f5f5f5;
    color: #666;
}

.cancel-button:hover {
    background: #e0e0e0;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.screen:not(.hidden) {
    animation: fadeIn 0.3s ease;
}

/* Responsive Design */
@media (max-width: 480px) {
    #app {
        padding: 16px;
    }
    
    .header-card {
        padding: 20px;
    }
    
    .app-title {
        font-size: 24px;
    }
    
    /* Comment out or remove the stacking for .stats-row */
    /* .stats-row { grid-template-columns: 1fr; } */
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
    
    .header-card, .welcome-card, .input-card, .birth-info-card {
        background: rgba(255, 255, 255, 0.95);
    }
    
    .reset-button {
        background: rgba(255, 255, 255, 0.9);
        color: #333;
    }
    
    .modal-content {
        background: rgba(255, 255, 255, 0.95);
    }
}