/**
 * Homepage Styles - Light Theme với màu sắc tươi sáng
 */

/* Hero Section */
.hero {
    position: relative;
    background: var(--gradient-hero);
    color: white;
    padding: var(--space-3xl) 0;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='50' cy='50' r='40' fill='none' stroke='rgba(255,255,255,0.1)' stroke-width='1'/%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    backdrop-filter: blur(4px);
}

.hero-badge .pulse-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.7;
        transform: scale(1.2);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 3.25rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: var(--space-lg);
}

.hero-title .highlight {
    background: linear-gradient(135deg, #fbbf24 0%, #f97316 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    opacity: 0.95;
    margin-bottom: var(--space-xl);
    max-width: 550px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
}

@media (min-width: 480px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    padding: 0 var(--space-lg);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 800;
    color: white;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-top: var(--space-xs);
}

/* Grade Selector */
.grade-selector {
    background: white;
    margin-top: -30px;
    position: relative;
    z-index: 10;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-lg);
}

.grade-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

@media (min-width: 640px) {
    .grade-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

.grade-item {
    padding: var(--space-lg);
    text-align: center;
    border-radius: var(--radius-xl);
    background: var(--bg-secondary);
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.grade-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.grade-item.active,
.grade-item:hover {
    border-color: var(--primary);
    background: rgba(14, 165, 233, 0.1);
}

.grade-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.grade-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    margin-top: var(--space-xs);
}

/* Grade Colors */
.grade-item.grade-10 {
    border-left: 4px solid #22c55e;
}

.grade-item.grade-11 {
    border-left: 4px solid #eab308;
}

.grade-item.grade-12 {
    border-left: 4px solid #ef4444;
}

.grade-item.grade-onthi {
    border-left: 4px solid #8b5cf6;
}

.grade-item.grade-luyende {
    border-left: 4px solid #06b6d4;
}

.grade-item.grade-coban {
    border-left: 4px solid #f97316;
}

.grade-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin: 0 auto;
}

.grade-icon svg {
    color: var(--primary);
}

.grade-item.grade-onthi .grade-icon svg {
    color: #8b5cf6;
}

.grade-item.grade-luyende .grade-icon svg {
    color: #06b6d4;
}

.grade-item.grade-coban .grade-icon svg {
    color: #f97316;
}

/* Section */
.section {
    padding: var(--space-3xl) 0;
}

.section-alt {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

.section-badge {
    display: inline-block;
    padding: 0.375rem 1rem;
    background: rgba(14, 165, 233, 0.1);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.section-description {
    color: var(--text-secondary);
    font-size: 1.0625rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    background: var(--bg-card);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-lg);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.feature-icon.orange {
    background: var(--gradient-secondary);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Subject Cards */
.subject-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.subject-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.subject-img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: var(--gradient-primary);
}

.subject-content {
    padding: var(--space-lg);
}

.subject-grade {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(14, 165, 233, 0.1);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}

.subject-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.subject-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.subject-meta span {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Teacher Cards */
.teacher-card {
    text-align: center;
    background: var(--bg-card);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.teacher-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

.teacher-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto var(--space-lg);
    border: 4px solid var(--primary);
    background: var(--gradient-primary);
}

.teacher-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.teacher-subject {
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.teacher-bio {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    gap: var(--space-lg);
}

@media (min-width: 768px) {
    .testimonials-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.testimonial-card {
    background: var(--bg-card);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.testimonial-stars {
    display: flex;
    gap: 4px;
    margin-bottom: var(--space-md);
    color: #fbbf24;
}

.testimonial-content {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.testimonial-author img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-name {
    font-weight: 700;
    color: var(--text-primary);
}

.testimonial-info {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* CTA Section */
.cta-section {
    background: var(--gradient-primary);
    padding: var(--space-3xl) 0;
    text-align: center;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    color: white;
    margin-bottom: var(--space-md);
}

.cta-description {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.0625rem;
    margin-bottom: var(--space-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}