:root {
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --secondary-gradient: linear-gradient(135deg, #3b82f6 0%, #2dd4bf 100%);
    --dark-bg: #030712;
    --card-bg: rgba(17, 24, 39, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
}

body {
    background-color: var(--dark-bg);
    color: var(--text-primary);
    overflow-x: hidden;
}

/* Hero Section */
.course-detail-hero {
    padding: 180px 0 100px;
    background: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.course-detail-icon {
    font-size: 4rem;
    margin-bottom: 25px;
    display: inline-block;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.3));
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.course-detail-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.course-meta-badges {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 35px;
    flex-wrap: wrap;
}

.meta-badge {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.meta-badge:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    border-color: rgba(99, 102, 241, 0.3);
}

.meta-badge i {
    color: #6366f1;
}

/* Phases Section */
.phases-section {
    padding: 100px 0;
}

.phase-container {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

/* Timeline Line */
.phase-container::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, transparent, var(--border-color) 10%, var(--border-color) 90%, transparent);
}

.phase-card {
    display: flex;
    gap: 40px;
    margin-bottom: 60px;
    position: relative;
}

.phase-number {
    flex-shrink: 0;
    width: 62px;
    height: 62px;
    background: var(--dark-bg);
    border: 2px solid #6366f1;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.5rem;
    color: #fff;
    z-index: 2;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.phase-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 35px;
    width: 100%;
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.phase-card:hover .phase-content {
    transform: translateX(10px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.phase-content h3 {
    font-size: 1.6rem;
    margin-bottom: 20px;
    color: #fff;
    font-weight: 700;
}

.module-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 15px;
}

.module-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.03);
    padding: 12px 18px;
    border-radius: 12px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.module-item i {
    color: #10b981;
    font-size: 0.8rem;
}

.module-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-color);
    color: #fff;
}

/* Enroll Strip */
.enroll-strip {
    margin-top: 80px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 24px;
    padding: 60px 40px;
    text-align: center;
    backdrop-filter: blur(20px);
}

.enroll-strip h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 15px;
}

/* Responsive */
@media (max-width: 768px) {
    .course-detail-title {
        font-size: 2.2rem;
    }
    
    .course-detail-hero {
        padding: 120px 0 60px;
    }
    
    .phase-container::before {
        left: 20px;
    }
    
    .phase-card {
        gap: 20px;
    }
    
    .phase-number {
        width: 42px;
        height: 42px;
        font-size: 1.1rem;
    }
    
    .phase-content {
        padding: 25px;
    }
    
    .module-list {
        grid-template-columns: 1fr;
    }
}