/* CSS Variables for Theme */
:root {
    --primary-blue: #0052FF;
    --primary-blue-hover: #0040cc;
    --text-dark: #1F2937;
    --text-gray: #6B7280;
    --bg-white: #FFFFFF;
    --bg-light: #F4F7FE;
    --bg-light-blue: #F0F4FF;
    --bg-stats: #F8FAFC;
    --border-color: #E5E7EB;
    --container-max: 1200px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    --shadow-blue: 0 10px 25px -5px rgba(0, 82, 255, 0.3);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.bg-white { background-color: var(--bg-white); }
.bg-light-blue { background-color: var(--bg-light-blue); }

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.small-title {
    font-size: 20px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-size: 16px;
}

.text-blue {
    color: var(--primary-blue);
}

.text-left {
    text-align: left;
    margin-left: 0;
    margin-right: 0;
}

.mb-0 { margin-bottom: 0 !important; }
.mt-30 { margin-top: 30px !important; }
.mt-40 { margin-top: 40px !important; }

.section-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 40px;
}

.view-all-link {
    color: var(--primary-blue);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.view-all-link:hover { gap: 12px; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 15px;
}

.btn-primary {
    background-color: var(--primary-blue);
    color: white;
    box-shadow: var(--shadow-blue);
}

.btn-primary:hover {
    background-color: var(--primary-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(0, 82, 255, 0.4);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
}

.btn-outline:hover {
    background-color: var(--bg-light-blue);
}

.btn-pill {
    border-radius: 50px;
}

.btn-block {
    width: 100%;
}

/* Header */
.site-header {
    background: var(--bg-white);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    flex: 1;
    display: flex;
    align-items: center;
}

.main-nav {
    flex: 0 0 auto;
}

.main-nav ul {
    display: flex;
    gap: 32px;
}

.main-nav li {
    position: relative;
    display: flex;
    align-items: center;
}

.main-nav a {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-dark);
    display: block;
    padding: 10px 0;
}

.main-nav a:hover,
.main-nav a.active,
.main-nav .current-menu-item > a,
.main-nav .current-menu-ancestor > a {
    color: var(--primary-blue);
}

/* Dropdown Menu Styles - Sporty, Dynamic, Bright */
.main-nav ul.sub-menu {
    display: block;
    position: absolute;
    top: calc(100% + 20px);
    left: -20px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    min-width: 300px;
    box-shadow: 0 30px 60px rgba(0, 82, 255, 0.12), 0 0 0 1px rgba(0, 82, 255, 0.05);
    border-radius: 20px;
    padding: 16px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px) scale(0.95);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1001;
    border-top: 4px solid var(--primary-blue);
}

.main-nav li {
    position: relative; /* ensure bridge works */
}

/* Invisible bridge so hover doesn't break when moving mouse down */
.main-nav li::after {
    content: '';
    position: absolute;
    bottom: -30px;
    left: 0;
    width: 100%;
    height: 30px;
}

.main-nav li:hover > ul.sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    top: 100%;
}

.main-nav ul.sub-menu li {
    display: block;
    width: 100%;
    margin-bottom: 8px;
}
.main-nav ul.sub-menu li:last-child {
    margin-bottom: 0;
}

.main-nav ul.sub-menu a {
    padding: 14px 20px;
    font-weight: 800;
    font-size: 13px;
    color: var(--text-dark);
    background: #f8fafc;
    border-radius: 12px;
    display: block;
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 1px solid #f1f5f9;
}

.main-nav ul.sub-menu a::before {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(135deg, var(--primary-blue), #0dcaf0);
    z-index: -1;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform: skewX(-20deg);
}

.main-nav ul.sub-menu a:hover {
    color: white;
    padding-left: 28px;
    border-color: transparent;
    box-shadow: 0 10px 20px rgba(0, 82, 255, 0.25);
    transform: translateX(5px);
}

.main-nav ul.sub-menu a:hover::before {
    left: 0;
    transform: skewX(0);
}

/* Hero Section */
.hero {
    padding: 60px 0 100px;
    background: var(--bg-light);
    overflow: hidden;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-light-blue);
    color: var(--primary-blue);
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 20px;
}

.hero-content h1 {
    font-size: 42px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    color: var(--text-dark);
}

.hero-content p {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 40px;
    max-width: 90%;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-trust {
    display: flex;
    align-items: center;
    gap: 16px;
}

.trust-avatars {
    display: flex;
}

.trust-avatars img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 3px solid white;
    margin-left: -16px;
}
.trust-avatars img:first-child { margin-left: 0; }

.trust-text {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.5;
}
.trust-text strong {
    color: var(--text-dark);
    font-size: 16px;
}
.stars { color: #FBBF24; font-size: 16px; letter-spacing: 2px;}

.hero-image-wrapper {
    position: relative;
}

.hero-image-box {
    background: #2D3748;
    border-radius: var(--radius-lg);
    padding: 20px;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

.hero-image-box img {
    border-radius: var(--radius-sm);
    width: 100%;
}

.floating-badge {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: white;
    padding: 12px 24px;
    border-radius: 50px;
    box-shadow: var(--shadow-lg);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: float 4s ease-in-out infinite;
}

.floating-badge i {
    color: var(--primary-blue);
}

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

/* Stats Section */
.stats {
    background: var(--bg-stats);
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
}

.stats-inner {
    display: flex;
    justify-content: space-between;
    text-align: center;
    margin-top: 30px;
}

.stat-item h3 {
    font-size: 40px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.stat-item p {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-gray);
}

/* Partners Section */
.partners {
    background: var(--bg-white);
    padding: 60px 0;
    text-align: center;
}

.partners-carousel {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    color: var(--text-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.nav-btn:hover {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

.partners-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex: 1;
}

.logo-box {
    height: 80px;
    flex: 1;
    max-width: 160px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: var(--transition);
}

.logo-box:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 30px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
}

.dot.active {
    background: var(--primary-blue);
    width: 24px;
    border-radius: 4px;
}

/* Features (Why Choose) */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.feature-icon-wrapper {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.feature-number {
    width: 48px;
    height: 48px;
    background: var(--bg-light-blue);
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 18px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon {
    font-size: 24px;
    color: var(--text-gray);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    font-size: 15px;
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bg-light-blue);
    border-radius: var(--radius-md);
    padding: 40px 30px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.service-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    border-color: var(--bg-light-blue);
    transform: translateY(-5px);
}

.service-icon {
    width: 56px;
    height: 56px;
    background: white;
    color: var(--primary-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-gray);
    font-size: 14px;
    margin-bottom: 20px;
}

.service-features {
    margin-bottom: 24px;
}

.service-features li {
    font-size: 14px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-dark);
}

.service-features li::before {
    content: '■';
    color: #FBBF24; /* yellow square bullet */
    font-size: 10px;
}

.service-link {
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.service-link:hover { gap: 8px; }

/* Process Section */
.process-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.process-img-main {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
}

.process-steps {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: 30px;
}

.process-step {
    display: flex;
    gap: 20px;
}

.step-number {
    width: 32px;
    height: 32px;
    background: var(--bg-light-blue);
    color: var(--primary-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.step-content p {
    color: var(--text-gray);
    font-size: 14px;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.project-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.project-img {
    height: 220px;
    overflow: hidden;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-img img { transform: scale(1.05); }

.project-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-content {
    padding: 24px;
}

.project-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.tag {
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 4px;
}

.tag-outline {
    border: 1px solid var(--primary-blue);
    color: var(--primary-blue);
    background: var(--bg-white);
}

.project-content h3 {
    font-size: 18px;
    margin-bottom: 16px;
    min-height: 50px;
}

/* Testimonials Section */
.carousel-nav {
    display: flex;
    gap: 10px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.rating {
    color: #FBBF24;
    margin-bottom: 16px;
    font-size: 18px;
}

.testimonial-text {
    font-size: 15px;
    color: var(--text-dark);
    margin-bottom: 24px;
    line-height: 1.7;
}

.client-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

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

.client-details h4 {
    font-size: 16px;
    margin-bottom: 2px;
}

.client-details p {
    font-size: 13px;
    color: var(--text-gray);
}

/* News Section */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.news-img {
    height: 200px;
    overflow: hidden;
    margin-bottom: 0;
}

.news-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-card:hover .news-img img { transform: scale(1.05); }

.news-content {
    padding: 20px 24px 24px;
}

.news-content h3 {
    font-size: 18px;
    margin: 12px 0;
    line-height: 1.4;
}

.news-meta {
    font-size: 13px;
    color: var(--text-gray);
}

/* News card link */
.news-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

/* News category tag with border frame */
.news-content .tag {
    display: inline-block;
    padding: 5px 14px;
    border: 1.5px solid var(--primary-blue);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-blue);
    background: rgba(0, 82, 255, 0.04);
    letter-spacing: 0.3px;
    transition: all 0.3s ease;
}

.news-card:hover .news-content .tag {
    background: var(--primary-blue);
    color: #fff;
}

/* CTA Section */
.cta-wrapper {
    display: grid;
    grid-template-columns: 1fr 450px;
    background: var(--primary-blue);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-blue);
}

.cta-info-box {
    padding: 60px;
    color: white;
    position: relative;
    z-index: 1;
}

.cta-info-box h2 {
    font-size: 36px;
    margin-bottom: 16px;
}

.cta-info-box p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 15px;
}

.cta-person-img {
    position: absolute;
    bottom: 0;
    right: -60px; /* Overlap slightly */
    height: 110%;
    max-width: none;
    z-index: 2;
    opacity: 0.9;
}

.cta-form-box {
    background: white;
    padding: 40px;
    border-radius: var(--radius-md);
    margin: 20px;
    box-shadow: var(--shadow-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px; /* Khoảng cách chuẩn xác giữa chữ và ô nhập */
    font-size: 14px;
    font-weight: 600;
}

/* Ẩn tất cả thẻ <br> do CF7 tự động sinh ra trong form-group để loại bỏ khoảng trống thừa */
.form-group br {
    display: none;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 15px;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.1);
}

/* Footer */
.site-footer {
    background: var(--bg-stats);
    padding: 60px 0 20px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 36px;
    height: 36px;
    background: var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-blue);
    color: white;
}

.footer-widget h4 {
    font-size: 16px;
    margin-bottom: 24px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-gray);
    font-size: 14px;
}

.footer-links a:hover {
    color: var(--primary-blue);
}

.newsletter-form {
    display: flex;
    gap: 8px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.newsletter-form button {
    padding: 0 20px;
    background: var(--primary-blue);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-gray);
    font-size: 14px;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
}

/* Responsive */
@media (max-width: 992px) {
    .hero-inner, .process-inner {
        grid-template-columns: 1fr;
    }
    .cta-wrapper {
        grid-template-columns: 1fr;
    }
    .cta-person-img {
        display: none;
    }
    .features-grid, .services-grid, .projects-grid, .testimonials-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-nav, .header-actions {
        display: none; /* Add hamburger menu logic in JS if needed */
    }
    .stats-inner {
        flex-direction: column;
        gap: 30px;
    }
    .features-grid, .services-grid, .projects-grid, .testimonials-grid, .news-grid, .footer-grid {
        grid-template-columns: 1fr;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

/* ═══════════════════════════════════════════════════════════════
   SCROLL REVEAL — Lazy Load Animation (áp dụng toàn site)
   IntersectionObserver tự động kích hoạt khi phần tử vào viewport
   ═══════════════════════════════════════════════════════════════ */

/* Trạng thái ban đầu — ẩn trước khi vào viewport */
.sr-hidden {
    opacity: 0;
    will-change: opacity, transform;
}

/* Kiểu 1: Fade Up (mặc định — từ dưới lên) */
.sr-fade-up {
    transform: translateY(50px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Kiểu 2: Fade Left (từ phải sang trái) */
.sr-fade-left {
    transform: translateX(60px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Kiểu 3: Fade Right (từ trái sang phải) */
.sr-fade-right {
    transform: translateX(-60px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Kiểu 4: Fade In (chỉ opacity + scale nhẹ) */
.sr-fade-in {
    transform: scale(0.97);
    transition: opacity 0.6s ease,
                transform 0.6s ease;
}

/* Trạng thái hiển thị — khi phần tử vào viewport */
.sr-visible {
    opacity: 1 !important;
    transform: translateY(0) translateX(0) scale(1) !important;
}

/* Stagger Delay — trễ dần cho từng item trong grid/list */
.sr-stagger-1 { transition-delay: 0.05s !important; }
.sr-stagger-2 { transition-delay: 0.12s !important; }
.sr-stagger-3 { transition-delay: 0.19s !important; }
.sr-stagger-4 { transition-delay: 0.26s !important; }
.sr-stagger-5 { transition-delay: 0.33s !important; }
.sr-stagger-6 { transition-delay: 0.40s !important; }
.sr-stagger-7 { transition-delay: 0.47s !important; }
.sr-stagger-8 { transition-delay: 0.54s !important; }

/* Accessibility: Tắt animation nếu người dùng prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    .sr-hidden,
    .sr-fade-up,
    .sr-fade-left,
    .sr-fade-right,
    .sr-fade-in {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
}

/* ═══════════════════════════════════════════════════════════════
   PAGE TRANSITION — Progress Bar + Skeleton Loading
   Kích hoạt NGAY khi click link, không cần chờ trang load xong
   ═══════════════════════════════════════════════════════════════ */

/* ── Top Progress Bar (giống YouTube / GitHub) ── */
#page-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, #0052FF, #00c6ff, #0052FF);
    background-size: 200% 100%;
    z-index: 99999;
    transition: width 0.3s ease, opacity 0.4s ease;
    opacity: 0;
    border-radius: 0 2px 2px 0;
    box-shadow: 0 0 10px rgba(0, 82, 255, 0.6);
    animation: progress-shimmer 1.5s linear infinite;
    will-change: width, opacity;
}

#page-progress-bar.active {
    opacity: 1;
    animation: progress-shimmer 1.5s linear infinite;
}

#page-progress-bar.done {
    width: 100% !important;
    opacity: 0;
    transition: width 0.2s ease, opacity 0.5s ease 0.2s;
}

@keyframes progress-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ── Page Transition Fade Overlay ── */
#page-transition-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0);
    z-index: 9998;
    pointer-events: none;
    transition: background 0.25s ease;
}

#page-transition-overlay.fading {
    background: rgba(255, 255, 255, 0.6);
    pointer-events: all;
}

/* ── Skeleton Loading — Header Placeholder ── */
#skeleton-header {
    position: fixed;
    top: 80px; /* bên dưới sticky header */
    left: 0;
    right: 0;
    z-index: 9997;
    background: #fff;
    padding: 40px 20px 30px;
    display: none;
    pointer-events: none;
}

#skeleton-header.visible {
    display: block;
}

/* Skeleton shimmer animation */
@keyframes skeleton-shimmer {
    0%   { background-position: -600px 0; }
    100% { background-position: 600px 0; }
}

.skeleton-block {
    border-radius: 8px;
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 50%,
        #f0f0f0 75%
    );
    background-size: 600px 100%;
    animation: skeleton-shimmer 1.4s ease-in-out infinite;
}

/* Hero skeleton */
.sk-hero {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 40px 0;
}

.sk-hero-left { display: flex; flex-direction: column; gap: 16px; }
.sk-badge    { height: 28px; width: 140px; border-radius: 20px; }
.sk-title-1  { height: 44px; width: 90%; }
.sk-title-2  { height: 44px; width: 70%; }
.sk-text-1   { height: 16px; width: 100%; margin-top: 8px; }
.sk-text-2   { height: 16px; width: 85%; }
.sk-btn      { height: 48px; width: 180px; border-radius: 8px; margin-top: 8px; }
.sk-hero-right { height: 340px; border-radius: 24px; }

/* Section skeleton (for below-the-fold) */
.sk-section {
    max-width: 1200px;
    margin: 40px auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 0;
}

.sk-card      { height: 220px; border-radius: 16px; }
.sk-card-tall { height: 280px; border-radius: 16px; }

@media (max-width: 768px) {
    .sk-hero     { grid-template-columns: 1fr; gap: 24px; }
    .sk-hero-right { display: none; }
    .sk-section  { grid-template-columns: 1fr; }
}

/* ── Body transition class — mờ dần content hiện tại khi navigate ── */
body.page-leaving > *:not(#page-progress-bar):not(#page-transition-overlay):not(#skeleton-header):not(.site-header) {
    opacity: 0.4;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

/* ── Loading spinner nhỏ góc phải ── */
#page-load-spinner {
    display: none !important;
}

#page-load-spinner.visible {
    display: none !important;
}

@keyframes spin {
    to { transform: rotate(360deg) scale(1); }
}

#page-load-spinner.visible {
    display: none !important;
}

@keyframes spin-show {
    0%   { transform: scale(1) rotate(0deg); }
    100% { transform: scale(1) rotate(360deg); }
}

/* ============================================
   PERFORMANCE: CHỈ GPU ACCELERATE PHẦN TỬ THỰC SỰ ANIMATE
   Không dùng will-change trên static elements → gây TBT cao
   ============================================ */

/* Chỉ ticker-track cần will-change vì nó animate liên tục */
.ticker-track {
    will-change: transform;
}

/* Scroll reveal — chỉ áp dụng trên desktop (JS tắt trên mobile) */
.sr-hidden {
    opacity: 0;
}
.sr-fade-up.sr-hidden {
    transform: translateY(24px);
}
.sr-fade-in.sr-hidden {
    transform: none;
}
.sr-visible {
    opacity: 1 !important;
    transform: none !important;
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.sr-stagger-1 { transition-delay: 0.05s; }
.sr-stagger-2 { transition-delay: 0.10s; }
.sr-stagger-3 { transition-delay: 0.15s; }
.sr-stagger-4 { transition-delay: 0.20s; }
.sr-stagger-5 { transition-delay: 0.25s; }
.sr-stagger-6 { transition-delay: 0.30s; }
.sr-stagger-7 { transition-delay: 0.35s; }
.sr-stagger-8 { transition-delay: 0.40s; }