/* Base styles for VEX Drive Train Simulator */
:root {
    --primary-color: #2196F3;
    --secondary-color: #4CAF50;
    --accent-color: #FF5722;
    --background-color: #f5f5f5;
    --card-color: #ffffff;
    --text-color: #333333;
    --border-color: #dddddd;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Roboto', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Header and Navigation */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.logo a {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 1.5rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}


.nav-links a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* Main content area */
main {
    min-height: calc(100vh - 140px);
    padding: 2rem 0;
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: white;
    padding: 1rem 0;
    margin-top: 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
}

/* Common components */
button {
    cursor: pointer;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    font-weight: 500;
    transition: background-color 0.3s;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.primary-btn:hover {
    background-color: #1976D2;
}

.secondary-btn {
    background-color: #f0f0f0;
    color: var(--text-color);
}

.secondary-btn:hover {
    background-color: #e0e0e0;
}

/* Container for page content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Card styles */
.card {
    background-color: var(--card-color);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        padding: 1rem;
    }
    
    .nav-links {
        margin-top: 1rem;
    }
    
    .nav-links li {
        margin-left: 1rem;
        margin-right: 1rem;
    }
}

/* General container styling */
.about-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    font-family: 'Arial', sans-serif;
    color: #333;
}

/* Page header styling */
.page-header h2 {
    font-size: 2rem;
    color: #0056b3;
    text-align: center;
    margin-bottom: 20px;
    border-bottom: 2px solid #0056b3;
    padding-bottom: 10px;
}

/* Section styling */
.about-section {
    margin-bottom: 30px;
}

.about-section h3 {
    font-size: 1.5rem;
    color: #0056b3;
    margin-bottom: 10px;
    border-left: 4px solid #0056b3;
    padding-left: 10px;
}

.about-section p {
    line-height: 1.6;
    margin-bottom: 15px;
}

.about-section ul, .about-section ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

.about-section ul li, .about-section ol li {
    margin-bottom: 10px;
}

/* Highlighted text (e.g., strong tags) */
.about-section strong {
    color: #333;
    font-weight: bold;
}

/* Controls guide styling */
.controls-guide {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
}

.control-key {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: #e9ecef;
    padding: 10px 15px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.control-key .key {
    font-size: 0.9rem;
    font-weight: bold;
    color: #0056b3;
    background-color: #fff;
    border: 2px solid #0056b3;
    border-radius: 4px;
    padding: 5px 10px;
    text-align: center;
    min-width: 40px;
}

.control-key .description {
    font-size: 1rem;
    color: #333;
}

/* Links styling */
.about-section a {
    color: #0056b3;
    text-decoration: none;
    font-weight: bold;
}

.about-section a:hover {
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .about-container {
        padding: 15px;
    }

    .page-header h2 {
        font-size: 1.8rem;
    }

    .about-section h3 {
        font-size: 1.3rem;
    }

    .control-key {
        flex-direction: column;
        align-items: flex-start;
    }

    .control-key .key {
        min-width: auto;
        margin-bottom: 5px;
    }
}

/* Donation Container Styles */
.donation-container {
    background: #ffffff;
    padding: 30px;
    margin: 40px auto;
    max-width: 500px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.donation-inner {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.donation-header {
    display: flex;
    align-items: center;
    gap: 15px;
}

.coffee-cup {
    width: 40px;
    height: 40px;
}

.donation-title h3 {
    margin: 0;
    color: #2d3748;
    font-size: 1.5rem;
}

.donation-title p {
    margin: 5px 0 0;
    color: #718096;
    font-size: 0.9rem;
}

.donation-amount {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.donation-amount label {
    color: #4a5568;
    font-size: 0.9rem;
}

.amount-input {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 12px;
    color: #4a5568;
}

#donation-value {
    width: 100%;
    padding: 8px 8px 8px 25px;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 1rem;
}

.donation-footer {
    text-align: center;
    color: #718096;
    font-size: 0.9rem;
}

/* Thank You Message Styles */
.thank-you-message {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.thank-you-inner {
    background: white;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    max-width: 400px;
    margin: 20px;
}

.thank-you-inner h3 {
    margin: 0 0 15px;
    color: #2d3748;
}

.close-thanks {
    margin-top: 20px;
    padding: 8px 16px;
    background: #4299e1;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.close-thanks:hover {
    background: #3182ce;
}

/* Responsive Design */
@media (max-width: 768px) {
    .donation-container {
        margin: 20px;
        padding: 20px;
    }
    
    .donation-title h3 {
        font-size: 1.2rem;
    }
}