@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;700;900&family=Roboto:wght@300;400;500;700&display=swap');

:root {
    --bg-color: #050505;
    --card-bg: rgba(20, 20, 20, 0.6);
    --text-color: #e0e0e0;
    --accent-cyan: #00E5FF;
    --accent-magenta: #FF00E5;
    --accent-yellow: #FFEA00;
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --neon-glow: 0 0 10px rgba(0, 229, 255, 0.5), 0 0 20px rgba(0, 229, 255, 0.3);
}

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

body {
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(0, 229, 255, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(255, 0, 229, 0.1) 0%, transparent 20%);
    color: var(--text-color);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* Header */
.course-header {
    text-align: center;
    padding: 80px 0;
    margin-bottom: 60px;
    position: relative;
}

.course-header h1 {
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(to right, var(--accent-cyan), #fff, var(--accent-magenta));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 30px rgba(0, 229, 255, 0.3);
    margin-bottom: 20px;
}

.course-header p {
    font-size: 1.2rem;
    color: #aaa;
    max-width: 600px;
    margin: 0 auto;
}

.back-nav {
    position: absolute;
    top: 20px;
    left: 20px;
}

.back-nav a {
    color: var(--accent-cyan);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.back-nav a:hover {
    text-shadow: 0 0 10px var(--accent-cyan);
}

/* Phase Section */
.phase-section {
    margin-bottom: 80px;
}

.phase-title {
    font-size: 2rem;
    margin-bottom: 30px;
    padding-left: 20px;
    border-left: 4px solid var(--accent-yellow);
    color: #fff;
    display: flex;
    align-items: center;
    gap: 15px;
}

.phase-title span {
    font-size: 1rem;
    color: var(--accent-cyan);
    font-family: 'Roboto', sans-serif;
    font-weight: 400;
    letter-spacing: 1px;
}

/* Grid */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

/* Card Style */
.lesson-card {
    background: var(--card-bg);
    border: var(--glass-border);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 25px;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.3);
}

.lesson-card:hover::before {
    opacity: 1;
}

.card-number {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    color: var(--accent-cyan);
    margin-bottom: 10px;
    display: block;
}

.card-title {
    font-size: 1.2rem;
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.4;
    color: #fff;
}

.card-desc {
    font-size: 0.9rem;
    color: #bbb;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-action {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.btn-start {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    color: var(--accent-magenta);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.icon-box {
    width: 30px;
    height: 30px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    font-size: 0.8rem;
}

/* Lesson Detail Page */
.lesson-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 20px;
}

.lesson-hero {
    text-align: center;
    margin-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 40px;
}

.lesson-hero .phase-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    border-radius: 20px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    margin-bottom: 20px;
}

.lesson-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #fff;
}

.content-section {
    margin-bottom: 60px;
}

.content-section h2 {
    color: var(--accent-magenta);
    margin-bottom: 25px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-section h2::before {
    content: '#';
    color: var(--accent-cyan);
}

.content-section p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: #d0d0d0;
}

.highlight-box {
    background: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--accent-yellow);
    padding: 20px;
    margin: 30px 0;
    border-radius: 0 8px 8px 0;
}

/* Interactive Elements Container */
.interactive-widget {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--accent-cyan);
    border-radius: 12px;
    padding: 30px;
    margin: 50px 0;
    box-shadow: 0 0 20px rgba(0, 229, 255, 0.1);
}

.widget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 15px;
}

.widget-header h3 {
    color: var(--accent-cyan);
    font-size: 1.2rem;
}

.widget-content {
    color: #fff;
}

/* Buttons */
.cyber-btn {
    background: transparent;
    border: 1px solid var(--accent-magenta);
    color: var(--accent-magenta);
    padding: 10px 20px;
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.cyber-btn:hover {
    background: var(--accent-magenta);
    color: #000;
    box-shadow: 0 0 15px var(--accent-magenta);
}

/* Footer */
footer {
    text-align: center;
    padding: 60px 0;
    color: #666;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 60px;
}

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

    .lesson-grid {
        grid-template-columns: 1fr;
    }
}
/* AdSense Containers */
.ad-container {
    width: 100%;
    max-width: 100%;
    margin: 30px 0;
    padding: 10px;
    background: #0a0a0a;
    border: 1px dashed #333;
    text-align: center;
    color: #555;
    font-size: 0.8rem;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}
.ad-label {
    margin-bottom: 5px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}