:root {
    --primary-color: #19245b;
    --secondary-color: #1977cc;
    --text-color: #444444;
    --light-color: #f8f9fa;
    --dark-color: #333333;
    --main-title-size: 2.5rem;
    --section-title-size: 1.6rem;
    --section-subtitle-size: 1.15rem;
    --main-title-color: #19245b;
    --section-title-color: #1977cc;
    --section-bg: #f8f9fa;
    --section-radius: 18px;
    --section-shadow: 0 2px 16px rgba(44,73,100,0.07);
}

* {
    box-sizing: border-box;
}

/* Base styles to prevent horizontal scroll */
html, body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

/* Main Content */
main {
    width: 100%;
    overflow-x: hidden;
    position: relative;
    margin-top: 40px;
    min-height: calc(100vh - 160px);
    padding: 2rem 5%;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    text-align: left;
}

.footer-column {
    flex: 1;
    min-width: 200px;
    margin: 10px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-logo img {
    height: 40px;
    margin-bottom: 5px;
}

.social-links {
    display: flex;
    gap: 18px;
    margin: 5px 5px 0 0;
}

.social-links img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    transition: transform 0.2s;
}

.social-links img:hover {
    transform: scale(1.12);
}

.footer-links {
    list-style: none;
    padding: 0;
}

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

.footer-links a {
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
}

.footer-links a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.footer-divider {
    border: none;
    border-top: 1px solid #b0b8be;
    margin: 0 0 10px 0;
}

.footer-bottom {
    color: #fff;
    text-align: center;
    font-size: 1rem;
    padding-bottom: 10px;
    letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-nav {
        padding: 1rem;
    }
    footer {
        display: none !important;
    }
    .floating-social-menu {
        display: none !important;
    }
}

.main-nav a:hover, .nav-links a:hover {
    text-decoration: none;
}

.bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-color);
    z-index: 1000;
    display: none;
    will-change: transform;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

@media (max-width: 768px) {
    .bottom-nav {
        display: block;
        height: 60px;
        box-shadow: 0 -2px 16px rgba(44, 73, 100, 0.10);
    }
}

.bottom-nav-links {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin: 0;
    padding: 0.5rem 0;
    list-style: none;
    height: 100%;
}

.bottom-nav-links a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #fff;
    font-size: 12px;
    text-decoration: none;
    transition: color 0.2s;
    padding: 4px 8px;
    width: 100%;
}

.bottom-nav-links a span {
    margin-top: 4px;
    font-size: 11px;
    white-space: nowrap;
}

.bottom-nav-links a .fas {
    font-size: 16px;
    margin-bottom: 3px;
    color: #b0b8be;
    transition: color 0.2s;
}

.bottom-nav-links a.active .fas,
.bottom-nav-links a:hover .fas {
    color: #fff;
}

.bottom-nav-links a.active,
.bottom-nav-links a:hover {
    color: #fff;
}

.floating-social-menu {
    align-items: end;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 8px;
    height: auto;
    justify-content: center;
    padding-right: 8px;
    position: fixed;
    right: 0;
    top: 22vh;
    width: 67px;
    z-index: 999;
}

.floating-social-menu a img {
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    transition: transform 0.18s, box-shadow 0.18s;
}

.floating-social-menu a img:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 16px rgba(0,0,0,0.18);
}

/* Scroll to top button */
#scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    z-index: 1000;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

#scroll-to-top:hover {
    background-color: #0056b3;
    transform: translateY(0);
}

/* Hiển thị button khi scroll xuống */
#scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

@media (max-width: 768px) {
    #scroll-to-top {
        display: none !important;
    }
}

.header-social-mobile {
    display: none;
}
@media (max-width: 768px) {
    .header-social-mobile {
        display: flex;
        gap: 12px;
        padding-left: 4px;
        margin-top: 1px;
    }
    .header-social-mobile a img {
        height: 28px;
        width: 28px;
        object-fit: contain;
    }
}

.main-title {
    font-size: var(--main-title-size);
    color: var(--main-title-color);
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.5em;
    letter-spacing: 1px;
}

.mb-15 {
    margin-bottom: 15px;
}

.mt-15 {
    margin-top: 15px;
}

/* Section styles */
.section {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-top: 1.2em;
    width: 100%;
    box-sizing: border-box;
}

/* Common image styles */
.section-image {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    height: auto;
    box-sizing: border-box;
    display: block;
}

.section-image2 {
    width: 100%;
    max-width: 500px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    height: auto;
    box-sizing: border-box;
}

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

/* Responsive styles */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2rem;
    }
    main {
        padding: 1rem 5% 80px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 1em 0 0;
        max-width: 100%;
    }

}

@media (max-width: 480px) {
    .section {
        padding: 0.8em 0 0;
    }

    .section-image,
    .section-image2 {
        width: 100%;
    }

}

.section-title {
    font-size: var(--section-title-size);
    color: var(--section-title-color);
    font-weight: 700;
    margin: 0 0 0.3em 0;
    text-align: left;
}

.section-subtitle {
    font-size: var(--section-subtitle-size);
    color: #444;
    font-weight: 500;
    margin-bottom: 0.2em;
    text-align: left;
}

@media (max-width: 768px) {
    .section-title {
        font-size: 1.3rem;
        margin-bottom: 0.4em;
    }
    .section-subtitle {
        font-size: 1rem;
        line-height: 1.5;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.15rem;
        margin-bottom: 0.3em;
    }
    .section-subtitle {
        font-size: 0.95rem;
        line-height: 1.4;
    }
}

.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    padding-left: 16px;
    padding-right: 16px;
}

/* Hero common styles */
.hero {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding: 0;
    background: none;
    box-shadow: none;
    overflow: hidden;
    width: 100%;
}

.hero-title {
    font-size: 30px;
    color: var(--primary-color);
    text-align: center;
    margin: 25px 0 22px;
    padding: 0 1rem;
    font-weight: 700;
    word-wrap: break-word;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.title-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    vertical-align: middle;
}

.hero-banner-container {
    position: relative;
    width: 100%;
    max-width: 1200px;
    display: flex;
    justify-content: center;
    overflow: hidden;
}

.hero-button {
    width: 100%;
    max-width: 1200px;
    display: block;
}

.hero-banner {
    width: 100%;
    height: auto;
    display: block;
}

/* Hero responsive */
@media (max-width: 1024px) {
    .hero-title {
        margin-top: 35px;
        margin-bottom: 18px;
    }
}

@media (max-width: 768px) {
    .hero {
        width: 100%;
        padding: 0;
        max-width: 100%;
    }

    .hero-banner-container {
        max-width: 100%;
    }

    .hero-button {
        max-width: 100%;
    }

    .hero-title {
        font-size: 1.5rem;
        padding: 0 10px;
    }

    .title-icon {
        width: 28px;
        height: 28px;
    }

}

@media (max-width: 480px) {
    .hero-title {
        font-size: 22px;
    }
    .title-icon {
        width: 24px;
        height: 24px;
    }
}