/* CSS Variables */
:root {
    --primary-color: #6E48AA;
    --secondary-color: #9D50BB;
    --complement-color: #00FFA3;
    --bg-color: #0f0f1a;
    --text-color: #FFFFFF;
    --error-color: #FF4646;
    --accent-color: #00ffa3;
}

/* Base Styles */
body, html {
    font-family: 'Poppins', sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-top: 120px;
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, rgba(110, 72, 170, 0.1), rgba(157, 80, 187, 0.1));
    z-index: -1;
}

/* Typography */
h1 {
    font-size: 4rem;
    margin-bottom: 10px;
    color: var(--accent-color);
    text-shadow: 0 0 20px rgba(0, 60, 255, 0.5);
}

h3 {
    color: var(--text-color);
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 4rem;
    line-height: 1.6;
}

/* Responsive Typography */
@media (max-width: 1024px) {
    h1 { font-size: 3rem; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
}

/* Search Section */
.search-section {
    padding: 40px 0;
    margin-bottom: 20px;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-bar {
    width: 100%;
    padding: 15px 20px;
    font-size: 1.1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--accent-color);
    border-radius: 30px;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.search-bar:focus {
    outline: none;
    box-shadow: 0 0 15px rgba(0, 255, 163, 0.3);
    background: rgba(255, 255, 255, 0.15);
}

.search-bar::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.search-container:focus-within .search-bar {
    box-shadow: 0 0 20px rgba(0, 255, 163, 0.4);
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent-color);
    font-size: 1.2rem;
}

/* Filter Tags */
.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
}

.filter-tag {
    padding: 8px 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    color: var(--text-color);
    cursor: pointer;
    transition: background 0.3s ease, border 0.3s ease;
    border: 1px solid transparent;
}

.filter-tag:hover {
    background: rgba(0, 255, 163, 0.1);
    border-color: var(--accent-color);
}

.filter-tag.active {
    background: var(--accent-color);
    color: var(--bg-color);
}

/* Layout & Grid */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.courses {
    padding-bottom: 100px;
}

.course-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

/* Course Cards */
.course-feature-card {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease;
}

.course-feature-card img {
    margin-bottom: 20px;
}

.course-feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.course-feature-card p {
    color: var(--text-color);
}

.course-feature-card:hover {
    transform: translateY(-10px);
}

.course-feature-card.hidden {
    display: none;
}