/* Biến màu sắc và font chữ */
:root {
    --primary-color: #1A5276;
    --secondary-color: #2C5530;
    --accent-color: #E67E22;
    --light-color: #F8F9FA;
    --dark-color: #333;
    --gray-color: #6c757d;
    --serif-font: 'Georgia', 'Times New Roman', serif;
    --sans-font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Reset và thiết lập cơ bản */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--sans-font);
    color: var(--dark-color);
    line-height: 1.6;
    background-color: #fff;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    border: none;
}

    .btn-primary:hover {
        background-color: #d35400;
    }

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

    .btn-outline:hover {
        background-color: var(--primary-color);
        color: white;
    }

/* Header */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo-img {
    height: 60px; /* Điều chỉnh kích thước theo ý muốn */
    width: auto;
    margin-right: 10px;
}



.search-bar {
    flex: 1;
    max-width: 500px;
    margin: 0 20px;
    position: relative;
    overflow: hidden;
}

    .search-bar input {
        width: 100%;
        padding: 10px 15px;
        border: 1px solid #ddd;
        border-radius: 30px;
        font-size: 16px;
    }

    .search-bar button {
        position: absolute;
        right: 2px;
        top: 1px;
        background: #099e06;
        color: white;
        border: none;
        border-radius: 50%;
        height: 40px;
        cursor: pointer;
    }

.user-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

    .user-actions a {
        color: var(--dark-color);
        font-weight: 500;
    }

    .user-actions .btn {
        padding: 15px 15px;
    }

/* Navigation */
nav {
    background-color: var(--primary-color);
    padding: 10px 0;
}

.nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
}

    .nav-menu a {
        color: white;
        font-weight: 500;
        padding: 5px 0;
        position: relative;
    }

        .nav-menu a:hover::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--accent-color);
        }

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
}

    .dropdown-toggle i {
        font-size: 12px;
        transition: transform 0.3s ease;
    }

.dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    min-width: 250px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    padding: 10px 0;
    margin-top: 10px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--dark-color);
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 0;
    position: relative;
}

    .dropdown-menu a:hover {
        background-color: var(--light-color);
        color: var(--primary-color);
        padding-left: 25px;
    }

        .dropdown-menu a:hover::after {
            display: none;
        }

    .dropdown-menu a i {
        color: var(--primary-color);
        width: 16px;
        text-align: center;
        font-size: 14px;
    }

/* Hero Section */
.hero {
    background-image: linear-gradient(rgba(0,0,0,.6), rgba(0,0,0,.6)), url('/Designs/Images/img-thuvien.png');
    background-position: center;
    background-size: cover;
    background-size: cover;
    background-position: center;
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-family: var(--serif-font);
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

/* Categories Section */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    font-family: 'Times New Roman', Times, serif;
    font-size: 36px;
    color: var(--primary-color);
}

.categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 30px;
}

.category-card {
    background-color: white;
    border-radius: 8px;
    padding: 30px 20px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

    .category-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

.category-icon {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.category-card h3 {
    font-size: 18px;
    color: var(--dark-color);
}

/* Books Section */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
}

.books-filter {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.book-card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

    .book-card:hover {
        transform: translateY(-5px);
        box-shadow: rgba(50, 50, 93, 0.25) 0px 2px 5px -1px, rgba(0, 0, 0, 0.3) 0px 1px 3px -1px;
    }

.book-cover {
    background-color: #eee;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-color);
}

    .book-cover img.book-img {
        width: 100%;
        height: 100%;
        object-fit: cover; /* hoặc "contain" nếu muốn hiển thị toàn bộ ảnh */
        border-radius: 8px;
    }

.book-info {
    padding: 20px;
}

.book-title {
    font-weight: bold;
    margin-bottom: 5px;
    font-size: 18px;
}

.book-author {
    color: var(--gray-color);
    margin-bottom: 10px;
}

.book-meta {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--gray-color);
    margin-bottom: 15px;
}

.book-actions {
    display: flex;
    gap: 10px;
}

    .book-actions button {
        flex: 1;
        padding: 8px 0;
        border: none;
        border-radius: 4px;
        cursor: pointer;
        font-weight: 500;
        transition: background-color 0.3s;
    }

.btn-read {
    background-color: var(--accent-color);
    color: white;
}

    .btn-read:hover {
        background-color: #d35400;
    }

.btn-save {
    background-color: #eee;
    color: var(--dark-color);
}

    .btn-save:hover {
        background-color: #ddd;
    }

.view-more {
    text-align: center;
    margin-top: 40px;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    font-family: var(--serif-font);
}

.footer-section p {
    margin-bottom: 20px;
    color: #ccc;
}

.footer-section ul li {
    margin-bottom: 10px;
}

    .footer-section ul li a {
        color: #ccc;
        transition: color 0.3s;
    }

        .footer-section ul li a:hover {
            color: white;
        }

.social-icons {
    display: flex;
    gap: 15px;
}

    .social-icons a {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        transition: background-color 0.3s;
    }

        .social-icons a:hover {
            background-color: var(--accent-color);
        }

.newsletter input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: none;
    border-radius: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #ccc;
}

/* Footer contact block */
.footer-contact {
    padding-top: 15px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.footer-contact-item {
    color: #ddd;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

    .footer-contact-item i {
        width: 18px;
        color: var(--accent-color);
    }

/* Contact page */
.contact-hero .hero-content h1 {
    font-family: var(--serif-font);
    font-size: 40px;
    margin-bottom: 10px
}

.contact-hero .hero-content p {
    font-size: 18px
}

.contact-wrapper .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px
}

/* Responsive Design */
@media (max-width: 992px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }

    .search-bar {
        max-width: 100%;
        margin: 10px 0;
    }

    .nav-menu {
        flex-wrap: wrap;
        gap: 15px;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background-color: var(--primary-color);
        margin-top: 0;
        padding: 0;
        border-radius: 0;
    }

        .dropdown-menu a {
            color: white;
            padding: 10px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

            .dropdown-menu a:hover {
                background-color: rgba(255, 255, 255, 0.1);
                color: white;
                padding-left: 25px;
            }

            .dropdown-menu a i {
                color: var(--accent-color);
            }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 18px;
    }

    .books-filter {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .categories {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .user-actions {
        flex-direction: column;
        gap: 10px;
    }

    .nav-menu {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }

    .hero {
        padding: 60px 0;
    }

        .hero h1 {
            font-size: 28px;
        }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .categories {
        grid-template-columns: 1fr 1fr;
    }

    .books-grid {
        grid-template-columns: 1fr;
    }
}
.hidden-book {
    display: none !important;
}







/* Header */
header {
    padding: 18px 0;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: saturate(150%) blur(10px);
    -webkit-backdrop-filter: saturate(150%) blur(10px);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

    .brand img {
        height: 42px;
        width: auto;
    }

nav ul {
    list-style: none;
    display: flex;
}

nav a {
    color: var(--text-medium);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

    nav a:hover {
        color: var(--primary);
    }

    nav a:after {
        content: "";
        position: absolute;
        width: 0;
        height: 2px;
        bottom: -4px;
        left: 0;
        background-color: var(--primary);
        transition: var(--transition);
    }

    nav a:hover:after {
        width: 100%;
    }

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border);
    padding: 8px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--text-dark);
    transition: var(--transition);
}

    .menu-toggle:focus-visible {
        outline: 3px solid var(--primary-light);
        outline-offset: 2px;
    }

    .menu-toggle:hover {
        background-color: #f1f5f9;
    }

.cta-link {
    padding: 10px 20px;
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius);
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

    .cta-link:hover {
        background-color: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: var(--shadow);
    }



.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 14px;
    border: 1px solid rgba(37, 99, 235, 0.18);
}

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

    .btn-secondary:hover {
        background-color: rgba(37, 99, 235, 0.05);
        transform: translateY(-2px);
    }

.hero-visual {
    border-radius: calc(var(--radius) + 6px);
    overflow: hidden;
    box-shadow: 0 20px 45px -20px rgba(37, 99, 235, 0.35);
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: linear-gradient( 180deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.9) );
    height: 60%;
}

a {
    text-decoration: none;
}

.hero-visual video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    object-fit: cover;
    transition: var(--transition);
}

.hero-visual:hover video {
    transform: scale(1.02);
}

button {
    border: none;
    background-color: transparent;
    border-radius: 15px !important;
    height: 50px;
}

nav {
    display: flex;
    justify-content: space-between;
}
/* Media gallery */
.media-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.media-card {
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--shadow);
    aspect-ratio: 4 / 3;
}

    .media-card img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        transition: transform 0.5s ease;
    }

    .media-card:hover img {
        transform: scale(1.03);
    }

.section-image {
    width: 100%;
    max-width: 900px;
    height: auto;
    display: block;
    margin: 24px auto 0;
    border-radius: var(--radius);
    box-shadow: 0 12px 30px -12px rgba(15, 23, 42, 0.25);
    border: 1px solid rgba(148, 163, 184, 0.25);
}

/* Back to top */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #fff;
    border: none;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 200;
}

    .back-to-top.visible {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

/* Sections */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-family: "Playfair Display", serif;
    font-size: 2.25rem;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-medium);
    max-width: 700px;
    margin: 0 auto;
}

/* Split section */
.split-section .container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
}

.split-section .text-col .section-header {
    text-align: left;
    margin-bottom: 24px;
}

.split-section .text-col {
    max-width: 680px;
}

.split-section.reverse .text-col {
    order: 2;
}

.split-section.reverse .media-col {
    order: 1;
}

.split-media {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: 0 20px 45px -20px rgba(37, 99, 235, 0.25);
    background: #fff;
}

    .split-media img {
        width: 100%;
        height: 100%;
        display: block;
        object-fit: cover;
    }

/* Problem Solution */
.problem-solution {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.problem-card,
.solution-card {
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: var(--gradient-card);
    border: 1px solid rgba(148, 163, 184, 0.25);
    transition: var(--transition);
}

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

.problem-card {
    border-top: 4px solid #ef4444;
}

.solution-card {
    border-top: 4px solid var(--accent);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

    .card-header i {
        font-size: 1.5rem;
    }

.problem-card .card-header i {
    color: #ef4444;
}

.solution-card .card-header i {
    color: var(--accent);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.card-content {
    color: var(--text-medium);
    text-align: justify;
    text-justify: inter-word;
}

/* Benefits */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.benefit-card {
    background: #fff;
    border-radius: 16px;
    padding: 24px 20px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

    .benefit-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
    }

.benefit-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #2563eb; /* xanh dương chính */
    background: #e0ecff; /* nền nhạt */
    transition: all 0.3s ease;
}

.benefit-card:hover .benefit-icon {
    background: #2563eb;
    color: #fff;
}

.benefit-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #1e293b;
}

.benefit-description {
    font-size: 14px;
    color: #475569;
    line-height: 1.6;
}
/* 🎨 Màu icon cho từng ô */
.benefit-card:nth-child(1) .benefit-icon {
    color: #2196f3;
}
/* xanh dương */
.benefit-card:nth-child(2) .benefit-icon {
    color: #ff9800;
}
/* cam */
.benefit-card:nth-child(3) .benefit-icon {
    color: #4caf50;
}
/* xanh lá */
.benefit-card:nth-child(4) .benefit-icon {
    color: #9c27b0;
}
/* tím */

/* 🌈 Hiệu ứng đổi màu nền nhẹ khi hover */
.benefit-card:nth-child(1):hover {
    background: #e3f2fd;
}

.benefit-card:nth-child(2):hover {
    background: #fff3e0;
}

.benefit-card:nth-child(3):hover {
    background: #e8f5e9;
}

.benefit-card:nth-child(4):hover {
    background: #f3e5f5;
}
/* Steps */
#quy-trinh {
    text-align: center;
    background: #f9fafc;
    padding: 60px 20px;
    font-family: "Inter", sans-serif;
}

    #quy-trinh h2 {
        font-size: 32px;
        font-weight: 700;
        color: #1e2a5a;
    }

    #quy-trinh p {
        color: #555;
        margin-bottom: 40px;
        font-style: italic;
    }

.steps {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 50px;
}

.row {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.step {
    background: #fff;
    width: 200px;
    padding: 25px 15px;
    border-radius: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

    .step:hover {
        transform: translateY(-8px);
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    }

.icon {
    font-size: 30px;
}

.number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin: 10px auto;
    font-size: 18px;
    white-space: nowrap;
}

/* màu cho từng bước */
.color1 .number,
.color1 .icon {
    color: #2196f3;
}

.color2 .number,
.color2 .icon {
    color: #4caf50;
}

.color3 .number,
.color3 .icon {
    color: #ff9800;
}

.color4 .number,
.color4 .icon {
    color: #9c27b0;
}

.color5 .number,
.color5 .icon {
    color: #e91e63;
}

.color6 .number,
.color6 .icon {
    color: #00bcd4;
}

.color7 .number,
.color7 .icon {
    color: #795548;
}

.step h3 {
    font-size: 18px;
    color: #1e2a5a;
    margin-bottom: 8px;
}

.step p {
    font-size: 14px;
    color: #666;
}

/* bố cục kim tự tháp ngược */
.row.bottom {
    margin-top: -20px;
}

/* Modules */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 20px;
}

.module-card {
    position: relative;
    border-radius: 20px;
    background: #fff;
    border: 1px solid rgba(148, 163, 184, 0.15);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

    .module-card:hover {
        transform: translateY(-8px) scale(1.02);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    }

.module-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

    .module-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.4s ease;
    }

.module-card:hover .module-image img {
    transform: scale(1.1);
}

.module-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.3));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.module-card:hover .module-overlay {
    opacity: 1;
}

.module-content {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.module-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.module-school .module-icon {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.module-ebook .module-icon {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    box-shadow: 0 8px 20px rgba(240, 147, 251, 0.3);
}

.module-standard .module-icon {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    box-shadow: 0 8px 20px rgba(79, 172, 254, 0.3);
}

.module-icon i {
    font-size: 1.5rem;
    color: #fff;
}

.module-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-dark);
    text-align: center;
    line-height: 1.3;
}

.module-description {
    color: var(--text-medium);
    margin-bottom: 20px;
    text-align: center;
    line-height: 1.6;
    flex: 1;
}

.module-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: auto;
}

.feature-tag {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.2);
    transition: all 0.3s ease;
}

.module-school .feature-tag {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    border-color: rgba(102, 126, 234, 0.2);
}

.module-ebook .feature-tag {
    background: rgba(240, 147, 251, 0.1);
    color: #f093fb;
    border-color: rgba(240, 147, 251, 0.2);
}

.module-standard .feature-tag {
    background: rgba(79, 172, 254, 0.1);
    color: #4facfe;
    border-color: rgba(79, 172, 254, 0.2);
}

.module-card:hover .feature-tag {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Module specific hover effects */
.module-school:hover {
    border-color: rgba(102, 126, 234, 0.3);
}

.module-ebook:hover {
    border-color: rgba(240, 147, 251, 0.3);
}

.module-standard:hover {
    border-color: rgba(79, 172, 254, 0.3);
}

/* Users */
.users-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-top: 20px;
}

.user-card {
    position: relative;
    border-radius: 20px;
    background: #fff;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(148, 163, 184, 0.15);
}

    .user-card:hover {
        transform: translateY(-8px) scale(1.02);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    }

.user-avatar {
    position: relative;
    height: 120px;
    overflow: hidden;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

    .user-avatar img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.4s ease;
    }

.user-card:hover .user-avatar img {
    transform: scale(1.1);
}

.user-badge {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 2;
}

.user-education .user-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.user-principal .user-badge {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.user-teacher .user-badge {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.user-student .user-badge {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.user-badge i {
    font-size: 1.1rem;
    color: #fff;
}

.user-content {
    padding: 32px 24px 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
    text-align: center;
}

.user-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-dark);
    line-height: 1.3;
}

.user-description {
    color: var(--text-medium);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.6;
    flex: 1;
}

.user-benefits {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: auto;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 12px;
    background: rgba(37, 99, 235, 0.05);
    transition: all 0.3s ease;
    font-size: 0.85rem;
    font-weight: 500;
}

.user-education .benefit-item {
    background: rgba(102, 126, 234, 0.05);
    color: #667eea;
}

.user-principal .benefit-item {
    background: rgba(240, 147, 251, 0.05);
    color: #f093fb;
}

.user-teacher .benefit-item {
    background: rgba(79, 172, 254, 0.05);
    color: #4facfe;
}

.user-student .benefit-item {
    background: rgba(67, 233, 123, 0.05);
    color: #43e97b;
}

.benefit-item i {
    font-size: 0.9rem;
    width: 16px;
    text-align: center;
}

.user-card:hover .benefit-item {
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* User card specific hover effects */
.user-education:hover {
    border-color: rgba(102, 126, 234, 0.3);
}

.user-principal:hover {
    border-color: rgba(240, 147, 251, 0.3);
}

.user-teacher:hover {
    border-color: rgba(79, 172, 254, 0.3);
}

.user-student:hover {
    border-color: rgba(67, 233, 123, 0.3);
}

/* CTA */
.cta-section {
    text-align: center;
    padding: 60px 0;
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius);
}

.cta-title {
    font-family: "Playfair Display", serif;
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.cta-description {
    font-size: 1.125rem;
    margin-bottom: 32px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

.btn-white {
    background-color: white;
    color: var(--primary);
    border: none;
}

    .btn-white:hover {
        background-color: #f1f5f9;
        transform: translateY(-2px);
        box-shadow: var(--shadow-lg);
    }

/* Footer */

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
}

    .footer-links a {
        color: #cbd5e1;
        transition: var(--transition);
    }

        .footer-links a:hover {
            color: #fff;
        }

/* Responsive */
@media (max-width: 1200px) {
    .modules-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
    }

    .module-card:last-child {
        grid-column: 1 / -1;
        max-width: 50%;
        margin: 0 auto;
    }
}

@media (max-width: 1024px) {
    .benefits-grid,
    .users-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .steps-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .split-section .container {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .user-avatar {
        height: 100px;
    }

    .user-content {
        padding: 28px 20px 20px;
    }
}

@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
        min-height: unset;
    }

    .hero-content h1 {
        font-size: 2.25rem;
    }

    .problem-solution {
        grid-template-columns: 1fr;
    }

    .menu-toggle {
        display: inline-flex;
        align-items: center;
        gap: 8px;
    }

    nav ul {
        display: none;
        position: absolute;
        top: 72px;
        right: 24px;
        left: 24px;
        flex-direction: column;
        gap: 12px;
        background: rgba(255, 255, 255, 0.98);
        padding: 16px;
        border-radius: var(--radius);
        box-shadow: var(--shadow-lg);
    }

    nav[aria-expanded="true"] ul {
        display: flex;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .modules-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .module-card:last-child {
        grid-column: 1;
        max-width: 100%;
        margin: 0;
    }

    .module-image {
        height: 180px;
    }

    .module-content {
        padding: 20px;
    }

    .module-title {
        font-size: 1.1rem;
    }

    .module-features {
        gap: 6px;
    }

    .feature-tag {
        font-size: 0.75rem;
        padding: 4px 10px;
    }
}

@media (max-width: 640px) {
    .benefits-grid,
    .users-grid,
    .steps-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .hero-content h1 {
        font-size: 1.875rem;
    }

    .user-avatar {
        height: 80px;
    }

    .user-content {
        padding: 24px 16px 16px;
    }

    .user-title {
        font-size: 1.1rem;
    }

    .user-description {
        font-size: 0.9rem;
    }

    .benefit-item {
        font-size: 0.8rem;
        padding: 6px 10px;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
    }
}

/* Screen-reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Nếu muốn thêm pattern chấm mờ */
#loi-ich {
    background: linear-gradient(135deg, #e3f0ff 0%, #cfd9f5 100%), url("https://www.transparenttextures.com/patterns/cubes.png");
    background-size: cover;
    padding: 60px 0;
    border-radius: 12px;
}

/* Phan-he section styling */
#phan-he {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

    #phan-he::before {
        content: "";
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: radial-gradient( circle, rgba(37, 99, 235, 0.03) 0%, transparent 70% );
        animation: float 20s ease-in-out infinite;
        pointer-events: none;
    }

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }

    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }

    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

/* Module card entrance animation */
.module-card {
    opacity: 0;
    transform: translateY(30px);
    animation: slideInUp 0.6s ease-out forwards;
}

    .module-card:nth-child(1) {
        animation-delay: 0.1s;
    }

    .module-card:nth-child(2) {
        animation-delay: 0.2s;
    }

    .module-card:nth-child(3) {
        animation-delay: 0.3s;
    }

@keyframes slideInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Pulse effect for module icons */
.module-icon::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    border-radius: 16px;
    background: inherit;
    opacity: 0.3;
    transform: translate(-50%, -50%) scale(1);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.3;
    }

    50% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.1;
    }

    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.3;
    }
}

/* Users section styling */
#nguoi-dung {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

    #nguoi-dung::before {
        content: "";
        position: absolute;
        top: -30%;
        right: -30%;
        width: 60%;
        height: 60%;
        background: radial-gradient( circle, rgba(6, 182, 212, 0.05) 0%, transparent 70% );
        animation: float 25s ease-in-out infinite reverse;
        pointer-events: none;
    }

/* User card entrance animation */
.user-card {
    opacity: 0;
    transform: translateY(40px);
    animation: slideInUp 0.8s ease-out forwards;
}

    .user-card:nth-child(1) {
        animation-delay: 0.1s;
    }

    .user-card:nth-child(2) {
        animation-delay: 0.2s;
    }

    .user-card:nth-child(3) {
        animation-delay: 0.3s;
    }

    .user-card:nth-child(4) {
        animation-delay: 0.4s;
    }

/* User badge pulse effect */
.user-badge::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: inherit;
    opacity: 0.3;
    transform: translate(-50%, -50%) scale(1);
    animation: badgePulse 3s infinite;
}

img {
    object-fit: contain;
    height: 100%;
}

nav {
    background-color: var(--primary-color);
    padding: 10px 0;
}

.nav-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
}

    .nav-menu a {
        color: white;
        font-weight: 500;
        padding: 5px 0;
        position: relative;
    }

        .nav-menu a:hover::after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--accent-color);
        }

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
}

    .dropdown-toggle i {
        font-size: 12px;
        transition: transform 0.3s ease;
    }

.dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    min-width: 250px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    padding: 10px 0;
    margin-top: 10px;
    display: flex;
    flex-direction: column;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--dark-color);
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 0;
    position: relative;
}

    .dropdown-menu a:hover {
        background-color: var(--light-color);
        color: var(--primary-color);
        padding-left: 25px;
    }

        .dropdown-menu a:hover::after {
            display: none;
        }

    .dropdown-menu a i {
        color: var(--primary-color);
        width: 16px;
        text-align: center;
        font-size: 14px;
    }

@keyframes badgePulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.3;
    }

    50% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 0.1;
    }

    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.3;
    }
}

/* Benefit item stagger animation */
.benefit-item {
    opacity: 0;
    transform: translateX(-20px);
    animation: slideInLeft 0.6s ease-out forwards;
}

.user-card:hover .benefit-item:nth-child(1) {
    animation-delay: 0.1s;
}

.user-card:hover .benefit-item:nth-child(2) {
    animation-delay: 0.2s;
}

.user-card:hover .benefit-item:nth-child(3) {
    animation-delay: 0.3s;
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}


.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    font-family: var(--serif-font);
}

.footer-section p {
    margin-bottom: 20px;
    color: #ccc;
}

.footer-section ul li {
    margin-bottom: 10px;
}

    .footer-section ul li a {
        color: #ccc;
        transition: color 0.3s;
    }

        .footer-section ul li a:hover {
            color: white;
        }

.social-icons {
    display: flex;
    gap: 15px;
}

    .social-icons a {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        transition: background-color 0.3s;
    }

        .social-icons a:hover {
            background-color: var(--accent-color);
        }

.newsletter input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: none;
    border-radius: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #ccc;
    background: linear-gradient(180deg, #0f172a, #0b1220);
}

/* Footer contact block */
.footer-contact {
    padding-top: 15px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.footer-contact-item {
    color: #ddd;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

    .footer-contact-item i {
        width: 18px;
        color: var(--accent-color);
    }

footer {
    background: linear-gradient(180deg, #0f172a, #0b1220);
    color: white;
    padding: 60px 0 20px;
}
@media (max-width: 768px) {
    .header-middle-v1 {
        display: none;
    }
}
.custom-btn {
    border-radius: 0px !important;
    min-height: 0 !important
}
.category-nav .category-trigger {
    position: relative;
    color: #000;
    text-decoration: none;
    border: 2px solid #eeeeee;
    display: block;
    font-weight: 700;
    padding: 14px 15px 12px 15px;
    margin-left: 10px;
}
@media (max-width: 768px) {
    #categoryFilter {
        font-size: 13px; /* chữ nhỏ hơn trên mobile */
        padding: 0.2rem 0.4rem;
    }
    option {
        font-size: 13px; /* chữ nhỏ hơn trên mobile */
        padding: 0.2rem 0.4rem;
    }

}

.input-sreach-custom{
    border-radius: 50% !important;
}

.accordion-header {
    width: 100%;
    color: white;
    background-color: #389740; 
    font-weight: 600;
    text-align: center;
    padding: 10px;
    border: none;
    outline: none;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 8px;
    transition: background 0.3s ease;
}

    .accordion-header:hover {
        background-color: #0056b3; /* xanh dương đậm hơn khi hover */
    }

/* Nội dung accordion */
.accordion-content {
    list-style: none;
    padding: 0 10px;
    margin: 0 0 10px 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

/* Khi mở */
.accordion-item.active .accordion-content {
    max-height: 500px;
    opacity: 1;
}

/* Liên kết danh mục */
.accordion-content li {
    margin: 6px 0;
}

.accordion-content a {
    text-decoration: none;
    color: #333;
    padding: 4px 8px;
    display: block;
    border-radius: 4px;
    transition: all 0.2s;
}

    /* Hover link */
    .accordion-content a:hover {
        background-color: #007bff;
        color: #fff;
        padding-left: 12px;
    }

.btn-mar-top-40{
    margin-top:40px;
}
::before {
    margin-right: 10px;
}
.fa-search:before {
    margin-right: 0px;
}
.fa-grip-vertical:before{
        margin-right: 0px;
}