/* Base Styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --light-text: #fff;
    --grid-gap: 20px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header & Nav */
header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 1rem 5%;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: flex-end;
    gap: 1.5rem;
}

nav a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

nav a:hover, nav a.active {
    background-color: var(--secondary-color);
}

/* Layout */
main {
    flex: 1;
}

.page-container {
    padding: 2rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title, .page-title {
    margin-bottom: 2rem;
    text-align: center;
    color: var(--primary-color);
}

/* Grid System */
.grid-container {
    display: grid;
    gap: var(--grid-gap);
}

.features {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.courses-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.details-grid {
    grid-template-columns: 2fr 1fr;
    align-items: start;
}

.auth-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.contact-grid {
    grid-template-columns: 1fr 1fr;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--light-text);
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    border: 2px solid var(--secondary-color);
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    text-align: center;
}

.btn:hover {
    background-color: #2980b9;
    border-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.btn-outline {
    background-color: transparent;
    color: var(--secondary-color);
}

.btn-outline:hover {
    background-color: var(--secondary-color);
    color: var(--light-text);
}

.btn-full {
    width: 100%;
}

/* Sections */
.banner {
    background: linear-gradient(rgba(44, 62, 80, 0.7), rgba(44, 62, 80, 0.7)), #34495e;
    color: var(--light-text);
    text-align: center;
    padding: 100px 20px;
}

.banner h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.banner p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

/* Cards */
.feature-card, .course-card, .sidebar-card, .form-wrapper, .contact-info, .contact-form-container {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card:hover, .feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

.course-card {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.course-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.course-info {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    margin: 1rem 0;
    font-weight: bold;
}

.price {
    color: var(--secondary-color);
    font-size: 1.2rem;
}

/* Course Details */
.details-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

.details-header h1 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
}

.curriculum-list {
    margin-top: 1rem;
    list-style-position: inside;
}

.curriculum-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

.price-tag {
    font-size: 2rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 1.5rem 0;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

.error-message {
    color: var(--accent-color);
    font-size: 0.85rem;
    display: block;
    margin-top: 0.3rem;
}

/* Contact Info */
.info-block {
    margin-bottom: 1.5rem;
}

.info-block h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.contact-link {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
}

.contact-link:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--light-text);
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1rem;
    }
    
    nav ul {
        justify-content: center;
        flex-wrap: wrap;
    }

    .details-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}