:root {
    --primary: #8b1a1a;
    --primary-light: #c62828;
    --dark: #1a1a2e;
    --gray-light: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
}

/* Override Bootstrap primary */
.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
}
.btn-primary:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-light);
}
.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
}
.btn-outline-primary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
}
.text-primary {
    color: var(--primary) !important;
}
.bg-primary {
    background-color: var(--primary) !important;
}
.border-primary {
    border-color: var(--primary) !important;
}
.page-link {
    color: var(--primary);
}
.page-item.active .page-link {
    background-color: var(--primary);
    border-color: var(--primary);
}

/* Top Bar */
.top-bar {
    background-color: var(--dark);
    color: #ccc;
    font-size: 0.82rem;
    padding: 6px 0;
}
@media (max-width: 575.98px) {
    .top-bar {
        font-size: 0.7rem;
    }
    .top-bar .container {
        flex-wrap: wrap;
        row-gap: 0.35rem;
    }
}
.top-bar a {
    color: #ddd;
    text-decoration: none;
}
.top-bar a:hover {
    color: #fff;
}

/* Navbar — 2 hàng: brand | menu full-width; expand từ xl */
.navbar {
    padding: 0.5rem 1rem;
}
.main-navbar.navbar {
    padding: 0;
    overflow: visible !important;
}
/* Cao hơn .sticky-lg-top của sidebar tài liệu (mặc định BS cùng 1020 → sidebar đè dropdown) */
.main-navbar.navbar.sticky-top {
    z-index: 1030;
}
.main-navbar-inner {
    max-width: 1400px;
    margin: 0 auto;
    overflow: visible;
}
.main-navbar .navbar-collapse.main-navbar-collapse {
    overflow: visible !important;
}
.main-navbar-top {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.main-navbar-brand.navbar-brand {
    min-width: 0;
    flex: 1 1 auto;
    max-width: none;
    margin-right: 0;
    padding-right: 0.25rem;
}
.main-navbar-toggler {
    flex-shrink: 0;
    padding: 0.4rem 0.55rem;
}
.main-navbar-top .brand-text {
    min-width: 0;
}
.brand-name {
    font-size: clamp(0.68rem, 0.55vw + 0.6rem, 0.88rem);
    color: var(--primary);
    line-height: 1.25;
    display: block;
    max-width: 100%;
}
.brand-sub {
    font-size: clamp(0.6rem, 0.4vw + 0.52rem, 0.72rem);
    line-height: 1.2;
}
/* Mobile & tablet: tên công ty xuống dòng, không đè lên nút menu */
@media (max-width: 1199.98px) {
    .main-navbar-brand .brand-name {
        white-space: normal;
        overflow-wrap: anywhere;
        word-break: break-word;
        font-size: 0.64rem;
        line-height: 1.35;
    }
    .main-navbar-brand .brand-sub {
        font-size: 0.58rem;
        margin-top: 0.15rem;
    }
}
@media (min-width: 1200px) {
    /* overflow: visible trên .main-navbar-collapse (global) để submenu không bị cắt */
    .main-navbar-collapse {
        width: 100%;
        border-top: 1px solid rgba(0, 0, 0, 0.06);
        margin-top: 0;
    }
    .main-navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
        margin-inline: auto;
        column-gap: 0.15rem;
        row-gap: 0.25rem;
        padding: 0.45rem 0 0.55rem;
    }
}
.main-navbar .nav-item.dropdown {
    position: relative;
}
.main-navbar .dropdown-menu {
    z-index: 1060;
}
.main-navbar .nav-link,
.main-navbar .dropdown-toggle {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.68rem;
    letter-spacing: 0.02em;
    padding: 0.5rem 0.32rem !important;
    color: #333 !important;
    transition: color 0.2s;
    white-space: nowrap;
}
.main-navbar .navbar-nav .dropdown-menu {
    font-size: 0.88rem;
    text-transform: none;
    max-height: 70vh;
    overflow-y: auto;
}
.main-navbar .dropdown-item {
    line-height: 1.4;
    padding-top: 0.55rem;
    padding-bottom: 0.55rem;
}
/* Submenu rộng — mỗi dòng một hàng (desktop) */
@media (min-width: 1200px) {
    .main-navbar .dropdown-menu-submenu.dropdown-menu-documents {
        min-width: max(30rem, max-content);
        max-width: min(48rem, 94vw);
        padding-top: 0.35rem;
        padding-bottom: 0.35rem;
    }
    .main-navbar .dropdown-menu-submenu.dropdown-menu-documents .dropdown-item {
        white-space: nowrap;
    }
}
.main-navbar .dropdown-menu-submenu.dropdown-menu-service {
    min-width: 12rem;
}
@media (min-width: 1200px) {
    .main-navbar .dropdown-menu-submenu.dropdown-menu-service .dropdown-item {
        white-space: nowrap;
    }
}
/* Mobile / collapse: submenu full width, chữ một dòng + cuộn ngang nếu cần */
@media (max-width: 1199.98px) {
    .main-navbar .navbar-nav .dropdown-menu-submenu {
        width: 100%;
        min-width: 100%;
        max-width: 100%;
        margin-top: 0;
        border-radius: 0;
        border-left: 3px solid var(--primary);
    }
    .main-navbar .dropdown-menu-submenu {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .main-navbar .dropdown-menu-submenu .dropdown-item {
        white-space: nowrap;
    }
}
@media (min-width: 1400px) {
    .main-navbar .nav-link,
    .main-navbar .dropdown-toggle {
        font-size: 0.74rem;
        padding: 0.52rem 0.42rem !important;
    }
}
.nav-link:hover,
.nav-link.active {
    color: var(--primary) !important;
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 480px;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    z-index: 0;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}
.hero-content {
    position: relative;
    z-index: 2;
    padding: 4rem 0;
}
.hero-title {
    font-size: 2.2rem;
    font-weight: 700;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.4);
}
.hero-subtitle {
    font-size: 1.2rem;
    text-shadow: 1px 1px 4px rgba(0,0,0,0.3);
    max-width: 600px;
    margin: 0 auto;
}

/* Page Header (inner pages) */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    padding: 2.5rem 0;
}
.page-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}
.page-header .breadcrumb-item a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}
.page-header .breadcrumb-item.active {
    color: rgba(255,255,255,0.6);
}
.page-header .breadcrumb-item + .breadcrumb-item::before {
    color: rgba(255,255,255,0.5);
}

/* Section Title */
.section-title {
    font-weight: 700;
    color: var(--primary);
    position: relative;
    padding-bottom: 0.5rem;
    margin-bottom: 1.2rem;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--primary);
}
.text-center .section-title::after {
    left: 50%;
    transform: translateX(-50%);
}

/* News Card */
.news-card {
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}
.news-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12) !important;
}
.news-card .card-title a:hover {
    color: var(--primary) !important;
}

/* Article Content */
.article-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #222;
}
.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}
.article-content p {
    line-height: 1.8;
}

/* Contact Info Card */
.contact-info-card {
    padding: 1rem;
    border-radius: 8px;
    background: var(--gray-light);
    transition: background 0.2s;
}
.contact-info-card:hover {
    background: #e9ecef;
}
.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-right: 1rem;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background-color: var(--dark);
    color: #ccc;
    padding-top: 3rem;
}
.footer-heading {
    color: #fff;
    font-weight: 600;
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.5rem;
}
.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary);
}
.footer-links li {
    margin-bottom: 0.4rem;
}
.footer-links a {
    color: #aaa;
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: #fff;
}

/* About content */
.about-content img {
    max-width: 100%;
    height: auto;
}

/* Trang tài liệu — viewer rộng, cao gần full viewport (kiểu xaydungbaoviet.com) */
.document-viewer-container {
    max-width: 1680px;
    margin-left: auto;
    margin-right: auto;
}
.document-sidebar-list {
    max-height: min(65vh, 480px);
    overflow-y: auto;
}
@media (min-width: 992px) {
    .document-sidebar-list {
        max-height: calc(100vh - 10rem);
    }
}
.pdf-viewer-shell {
    width: 100%;
    height: calc(100vh - 12rem);
    min-height: 560px;
    background: #4a4a4a;
}
@media (max-width: 991.98px) {
    .pdf-viewer-shell {
        height: calc(100vh - 14rem);
        min-height: 420px;
    }
}
@media (min-width: 1400px) {
    .pdf-viewer-shell {
        height: calc(100vh - 10.5rem);
        min-height: 680px;
    }
}
.pdf-viewer-iframe {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 100%;
    border: 0;
    background: #525659;
}

/* Responsive */
/* < xl: menu gập — dễ đọc trong collapse */
@media (max-width: 1199.98px) {
    .main-navbar-collapse {
        padding-bottom: 0.75rem;
    }
    .main-navbar .navbar-collapse > .navbar-nav > .nav-item > .nav-link:not(.dropdown-toggle) {
        white-space: normal;
        padding: 0.6rem 0 !important;
        font-size: 0.9rem;
    }
    .main-navbar .navbar-collapse .dropdown-toggle.nav-toggle-doc {
        font-size: 0.82rem;
        padding: 0.55rem 0 !important;
        white-space: normal !important;
        line-height: 1.35;
    }
    .main-navbar .navbar-collapse .dropdown-toggle:not(.nav-toggle-doc) {
        white-space: normal;
        padding: 0.6rem 0 !important;
        font-size: 0.9rem;
    }
}
@media (max-width: 768px) {
    .hero-title {
        font-size: 1.5rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero-section {
        min-height: 350px;
    }
}