/* Custom Fonts and Colors */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap');

:root {
    --primary-color: #6f42c1;
    --primary-hover: #563d7c;
    --background-color: #f8f9fa;
    --text-color: #333333;
    --header-bg: #ffffff;
    --card-bg: #ffffff;
    --footer-bg: #4a2b82;
    --footer-text: #ffffff;
    --error-color: #dc3545;
}

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

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

/* Header and Navigation */
header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: bold;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--primary-color);
}

/* Banner */
.banner {
    background: linear-gradient(rgba(111,66,193,0.8), rgba(86,61,124,0.8));
    color: white;
    text-align: center;
    padding: 4rem 2rem;
}

.banner h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.intro {
    text-align: center;
    margin: 2rem 0;
}

/* Grid System */
.grid-container {
    display: grid;
    gap: 2rem;
}

.courses-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    margin-top: 2rem;
}

.auth-container, .contact-container {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    align-items: start;
}

/* Cards */
.course-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    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 {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

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

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
    transition: background-color 0.3s ease;
}

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

/* Forms */
.form-section {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 1rem;
}

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

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
}

.error {
    color: var(--error-color);
    font-size: 0.85rem;
    display: block;
    margin-top: 0.25rem;
}

.success {
    color: green;
    font-weight: bold;
    margin-top: 1rem;
}

/* Course Details */
.course-details {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.course-details h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.course-details ul {
    list-style-position: inside;
    margin-top: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1rem;
    margin-top: auto;
}