/* =============================================
   TRANG CHỦ HỆ THỐNG ĐÀO TẠO
   ============================================= */

/* Common Styles for All Pages */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 1rem;
    position: relative;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 2px;
}

.section-title p {
    font-size: 1.1rem;
    color: #6c757d;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* CTA Section - Shared across pages */
.cta-section {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    padding: 4rem 0;
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="ctaPattern" width="40" height="40" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1" fill="white" opacity="0.1"/><circle cx="10" cy="30" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23ctaPattern)"/></svg>');
    pointer-events: none;
}

.cta-section .container {
    position: relative;
    z-index: 2;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.cta-description {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.cta-buttons .btn {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
    margin: 0.5rem;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 60vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    color: white;
    padding: 3rem 0;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1" fill="white" opacity="0.1"/><circle cx="80" cy="80" r="1" fill="white" opacity="0.1"/><circle cx="40" cy="60" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    line-height: 1.7;
}

.hero-actions {
    margin-top: 2rem;
}

.hero-actions .btn {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

.hero-image {
    position: relative;
    z-index: 2;
}

/* Features Section */
.features-section {
    padding: 5rem 0;
    background-color: #f8f9fa;
}

.feature-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    height: 100%;
    border: none;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.feature-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.8rem;
    color: white;
}

.feature-icon.primary { background: linear-gradient(135deg, #667eea, #764ba2); }
.feature-icon.success { background: linear-gradient(135deg, #56ab2f, #a8e6cf); }
.feature-icon.warning { background: linear-gradient(135deg, #f093fb, #f5576c); }
.feature-icon.info { background: linear-gradient(135deg, #4facfe, #00f2fe); }

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.feature-description {
    color: #6c757d;
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works-section {
    padding: 5rem 0;
    background: white;
}

.step-card {
    position: relative;
    padding: 2rem;
    text-align: center;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    height: 100%;
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.4);
}

.step-icon {
    font-size: 3rem;
    color: #667eea;
    margin: 2rem 0 1rem;
}

.step-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.step-description {
    color: #6c757d;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* User Roles Section */
.roles-section {
    padding: 5rem 0;
    background-color: #f8f9fa;
}

.role-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    height: 100%;
}

.role-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

.role-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
}

.role-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #2c3e50;
    text-align: center;
}

.role-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.role-features li {
    padding: 0.75rem 0;
    color: #6c757d;
    border-bottom: 1px solid #f0f0f0;
    line-height: 1.5;
}

.role-features li:last-child {
    border-bottom: none;
}

.role-features li i {
    color: #667eea;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .cta-title,
    .section-title h2 {
        font-size: 1.8rem;
    }
    
    .feature-card,
    .role-card,
    .step-card {
        margin-bottom: 2rem;
    }

    .step-card {
        margin-top: 1.5rem;
    }

    .hero-actions .btn,
    .cta-buttons .btn {
        display: block;
        width: 100%;
        margin: 0.5rem 0;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}