:root {
    --primary-color: #2196F3;
    --secondary-color: #1976D2;
    --surface-color: #FFFFFF;
    --background-color: #F5F5F5;
    --text-primary: rgba(0, 0, 0, 0.87);
    --text-secondary: rgba(0, 0, 0, 0.6);
    --elevation-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}

/* Flutter Scaffold simulation */
body {
    background-color: var(--background-color);
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Flutter AppBar simulation */
.app-bar {
    background: var(--primary-color);
    color: white;
    padding: 16px;
    box-shadow: var(--elevation-1);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    min-height: 56px;
}

.app-bar h1 {
    margin: 0;
    font-size: 20px;
    font-weight: 500;
}

main {
    flex: 1;
    padding: 16px;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.data-item {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--elevation-1);
    transition: box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}

.data-item:active {
    box-shadow: var(--elevation-2);
}

.data-item h2 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0 0 8px 0;
    letter-spacing: 0.1px;
}

.value {
    font-size: 34px;
    color: var(--text-primary);
    font-weight: 400;
    margin: 0;
    line-height: 1.2;
}

.data-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: currentColor;
    opacity: 0;
    transition: opacity 0.3s;
}

.data-item:active::before {
    opacity: 0.1;
}

footer {
    background: var(--surface-color);
    color: var(--text-secondary);
    padding: 16px;
    text-align: center;
    box-shadow: var(--elevation-1);
    font-size: 12px;
}

/* Flutter Dialog styles */
.flutter-dialog-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.32);
    z-index: 1000;
    animation: fadeIn 0.2s ease-out;
}

.flutter-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface-color);
    border-radius: 28px;
    padding: 24px;
    min-width: 280px;
    max-width: 90%;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    animation: slideUp 0.3s ease-out;
}

.flutter-dialog-title {
    font-size: 24px;
    font-weight: 400;
    color: var(--text-primary);
    margin: 0 0 16px 0;
}

.flutter-dialog-content {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.flutter-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.flutter-button {
    border: none;
    background: transparent;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.flutter-button:active {
    background: rgba(33, 150, 243, 0.12);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translate(-50%, -40%);
    }
    to { 
        opacity: 1;
        transform: translate(-50%, -50%);
    }
}

@media (max-width: 600px) {
    main {
        padding: 8px;
    }

    .data-item {
        border-radius: 8px;
        margin-bottom: 8px;
    }
}