/* ===== SECTIONS - HERO, FEATURES, DOWNLOAD, etc. ===== */

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding: 6rem 0 3rem;  /* giảm padding */
    min-height: 90vh;      /* giảm min-height */
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.hero-text h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.stat i {
    color: var(--primary-color);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    width: clamp(200px, 40vw, 400px);
    height: auto;
    filter: drop-shadow(var(--shadow-xl));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* ===== FEATURES SECTION ===== */
.features {
    padding: var(--space-2xl) 0;   /* giảm từ 3xl xuống 2xl */
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    background: var(--bg-primary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--text-muted);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--feature-bg-1), var(--feature-bg-2));
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.feature-card:hover::before {
    opacity: 0.1;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* Individual feature card colors */
.feature-card:nth-child(1) {
    --feature-bg-1: var(--feature-color-1);
    --feature-bg-2: var(--feature-color-1-hover);
}

.feature-card:nth-child(1) .feature-icon {
    background: linear-gradient(135deg, var(--feature-color-1), var(--feature-color-1-hover));
}

.feature-card:nth-child(2) {
    --feature-bg-1: var(--feature-color-2);
    --feature-bg-2: var(--feature-color-2-hover);
}

.feature-card:nth-child(2) .feature-icon {
    background: linear-gradient(135deg, var(--feature-color-2), var(--feature-color-2-hover));
}

.feature-card:nth-child(3) {
    --feature-bg-1: var(--feature-color-3);
    --feature-bg-2: var(--feature-color-3-hover);
}

.feature-card:nth-child(3) .feature-icon {
    background: linear-gradient(135deg, var(--feature-color-3), var(--feature-color-3-hover));
}

.feature-card:nth-child(4) {
    --feature-bg-1: var(--feature-color-4);
    --feature-bg-2: var(--feature-color-4-hover);
}

.feature-card:nth-child(4) .feature-icon {
    background: linear-gradient(135deg, var(--feature-color-4), var(--feature-color-4-hover));
}

.feature-card:nth-child(5) {
    --feature-bg-1: var(--feature-color-5);
    --feature-bg-2: var(--feature-color-5-hover);
}

.feature-card:nth-child(5) .feature-icon {
    background: linear-gradient(135deg, var(--feature-color-5), var(--feature-color-5-hover));
}

.feature-card:nth-child(6) {
    --feature-bg-1: var(--feature-color-6);
    --feature-bg-2: var(--feature-color-6-hover);
}

.feature-card:nth-child(6) .feature-icon {
    background: linear-gradient(135deg, var(--feature-color-6), var(--feature-color-6-hover));
}

.feature-icon {
    width: 4rem;
    height: 4rem;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    transition: transform var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--text-light);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== SCREENSHOTS SECTION ===== */
.screenshots {
    padding: var(--space-2xl) 0;   /* giảm từ 3xl xuống 2xl */
    background: var(--bg-primary);
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));  /* tăng từ 300px lên 350px */
    gap: var(--space-xl);
}

.screenshot-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.screenshot-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(37, 99, 235, 0.1);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 1;
}

.screenshot-item:hover::before {
    opacity: 1;
}

.screenshot-item::after {
    content: '🔍';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 2;
    color: var(--text-light);
}

.screenshot-item:hover::after {
    opacity: 1;
}

.screenshot-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-normal);
}

.screenshot-item:hover img {
    transform: scale(1.05);
}

/* ===== DOWNLOAD SECTION ===== */
.download {
    padding: var(--space-2xl) 0;   /* giảm từ 3xl xuống 2xl */
    background: var(--bg-secondary);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.download-card {
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--text-muted);
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.download-icon {
    width: 5rem;
    height: 5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
}

.download-icon i {
    font-size: 2rem;
    color: var(--text-light);
}

.download-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

/* ===== DOCUMENTATION SECTION ===== */
.docs {
    padding: var(--space-2xl) 0;   /* giảm từ 3xl xuống 2xl */
    background: var(--bg-primary);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));  /* giảm từ 280px để fit 5 cards */
    gap: var(--space-xl);
}

.doc-card {
    background: var(--bg-secondary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--text-muted);
    position: relative;
}

.doc-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    width: 3rem;
    height: 3rem;
    background: var(--primary-color);
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0 auto var(--space-lg);
}

.doc-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.doc-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--space-3xl) 0 var(--space-xl);
}

[data-theme="dark"] .footer {
    background: var(--bg-tertiary);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
}

.footer-logo img {
    width: 2rem;
    height: 2rem;
}

.footer-section h4 {
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-light);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--space-sm);
}

.footer-section ul li a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--text-light);
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-links a {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--text-muted);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    color: var(--text-primary);
}

[data-theme="dark"] .social-links a {
    background: var(--bg-primary);
    border-color: var(--text-secondary);
    color: var(--text-light);
}

.social-links a:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--text-muted);
    color: var(--text-muted);
}