/* theme-2 — UI dựa trên web-2 (dark navy + gold + teal, glass-card) */
:root {
    --color-navy: #0a1628;
    --color-dark-blue: #0f1d36;
    --color-accent-gold: #c8956c;
    --color-accent-teal: #2dd4bf;
    --color-text-primary: #e8edf2;
    --color-text-secondary: #94a3b8;
    --color-glass: rgba(15, 29, 54, 0.75);
    --color-border: rgba(200, 149, 108, 0.2);
}
body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--color-navy);
    color: var(--color-text-primary);
    overflow-x: hidden;
    line-height: 1.6;
}
.text-gold { color: var(--color-accent-gold); }
.text-teal { color: var(--color-accent-teal); }
.text-secondary-custom { color: var(--color-text-secondary); }
.bg-navy { background: var(--color-navy); }
.bg-dark-blue { background: var(--color-dark-blue); }
.bg-cta { background: linear-gradient(135deg, #1a3050 0%, #0f1d36 100%); }

/* ===== Header ===== */
.navbar-official {
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 0;
}
.navbar-official .navbar-brand img { max-height: 42px; }
.navbar-official .nav-link {
    color: var(--color-text-secondary) !important;
    font-weight: 500;
    margin: 0 0.8rem;
    transition: color 0.2s;
}
.navbar-official .nav-link:hover,
.navbar-official .nav-link.active { color: var(--color-accent-gold) !important; }
.btn-register-official {
    background: transparent;
    border: 1.5px solid var(--color-accent-gold);
    color: var(--color-accent-gold);
    font-weight: 600;
    padding: 0.5rem 1.8rem;
    border-radius: 2px;
    letter-spacing: 0.5px;
    text-decoration: none;
    transition: 0.3s;
}
.btn-register-official:hover { background: var(--color-accent-gold); color: #000; }
.btn-login-official {
    color: var(--color-text-secondary);
    border: 1px solid #1e293b;
    padding: 0.5rem 1.4rem;
    border-radius: 2px;
    font-weight: 500;
    text-decoration: none;
    transition: 0.3s;
}
.btn-login-official:hover { color: var(--color-text-primary); border-color: var(--color-text-secondary); }

/* ===== Nút vàng đặc ===== */
.btn-solid-gold {
    display: inline-block;
    background: var(--color-accent-gold);
    border: none;
    color: #000;
    font-weight: 700;
    padding: 0.7rem 2.2rem;
    border-radius: 2px;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    text-decoration: none;
    transition: 0.3s;
}
.btn-solid-gold:hover { background: #dba97a; color: #000; }

/* ===== Breadcrumb ===== */
.breadcrumb-nav { background: #0f1d36; border-bottom: 1px solid #1e293b; }
.breadcrumb-nav .breadcrumb-item.active { color: var(--color-text-primary); }
.breadcrumb-nav .breadcrumb-item + .breadcrumb-item::before { color: var(--color-text-secondary); }

/* ===== Hero ===== */
.hero-section-official {
    background: radial-gradient(ellipse at 30% 20%, #1a3050 0%, #0a1628 70%);
    min-height: 72vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}
.hero-section-official::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(45, 212, 191, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}
.badge-authority {
    background: rgba(200, 149, 108, 0.12);
    border-left: 3px solid var(--color-accent-gold);
    padding: 0.4rem 1.2rem;
    font-size: 0.85rem;
    color: var(--color-accent-gold);
    letter-spacing: 0.8px;
    display: inline-block;
}
.hero-img { max-height: 400px; }

/* ===== Glass card ===== */
.glass-card {
    background: var(--color-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--color-border);
    border-radius: 0;
    transition: 0.3s;
    overflow: hidden;
}
.glass-card:hover {
    border-color: var(--color-accent-gold);
    background: rgba(15, 29, 54, 0.9);
}
.glass-card .card-img-top { width: 100%; object-fit: cover; }
.glass-card a { text-decoration: none; }
.glass-card h2 a, .glass-card h3 a { color: var(--color-text-primary); }
.glass-card h2 a:hover, .glass-card h3 a:hover { color: var(--color-accent-gold); }

/* ===== Tiêu đề section ===== */
.section-heading {
    font-weight: 700;
    letter-spacing: 1px;
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 2.5rem;
    text-align: center;
    color: var(--color-text-primary);
}
.section-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--color-accent-gold);
}

/* ===== Sidebar hot ===== */
.sidebar-hot-card {
    background: var(--color-glass);
    border: 1px solid var(--color-border);
    padding: 1.2rem;
    margin-bottom: 1.2rem;
}
.sidebar-hot-card .hot-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    text-decoration: none;
    color: var(--color-text-primary);
    transition: background 0.2s;
}
.sidebar-hot-card .hot-item:last-child { border-bottom: none; }
.sidebar-hot-card .hot-item:hover { background: rgba(200, 149, 108, 0.08); }
.sidebar-hot-card .hot-img {
    width: 55px;
    height: 55px;
    object-fit: cover;
    flex-shrink: 0;
}
.sidebar-hot-card .hot-info h3, .sidebar-hot-card .hot-info h4 {
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--color-text-primary);
}
.sidebar-hot-card .hot-info .date { font-size: 0.7rem; color: var(--color-text-secondary); }
.sticky-sidebar { position: sticky; top: 90px; }

/* ===== Nội dung bài viết ===== */
.content-box { line-height: 1.9; color: var(--color-text-primary); }
.content-box img { max-width: 100%; height: auto; }
.content-box a { color: var(--color-accent-teal); }
.article-panel {
    background: var(--color-glass);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
}
.badge-category {
    background: rgba(200, 149, 108, 0.12);
    border: 1px solid var(--color-accent-gold);
    color: var(--color-accent-gold);
    padding: 0.3rem 1rem;
    font-size: 0.75rem;
    text-decoration: none;
    display: inline-block;
}
.badge-category:hover { background: var(--color-accent-gold); color: #000; }

/* ===== Phân trang ===== */
.pagination .page-link {
    background: var(--color-glass);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    border-radius: 0;
}
.pagination .page-link:hover { color: var(--color-accent-gold); border-color: var(--color-accent-gold); background: var(--color-dark-blue); }
.pagination .page-item.active .page-link {
    background: var(--color-accent-gold);
    border-color: var(--color-accent-gold);
    color: #000;
}

/* ===== Form ===== */
.theme2-form .form-control {
    background: var(--color-dark-blue);
    border: 1px solid var(--color-border);
    border-radius: 0;
    color: var(--color-text-primary);
    padding: 0.75rem 1rem;
}
.theme2-form .form-control::placeholder { color: var(--color-text-secondary); }
.theme2-form .form-control:focus {
    background: var(--color-dark-blue);
    border-color: var(--color-accent-gold);
    color: var(--color-text-primary);
    box-shadow: 0 0 0 0.2rem rgba(200, 149, 108, 0.15);
}
.theme2-form .form-label { color: var(--color-text-secondary); }

/* ===== Accordion (FAQ) ===== */
.accordion-button.bg-dark { border-radius: 0; }

/* ===== Footer ===== */
.footer-official-new {
    background: #060e1a;
    border-top: 3px solid var(--color-accent-gold);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}
.footer-official-new h6 {
    color: #e8edf2;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.footer-official-new a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: 0.2s;
}
.footer-official-new a:hover { color: var(--color-accent-gold); }
.footer-official-new .footer-bottom { border-top: 1px solid #1e293b; color: #64748b; }
.footer-official-new .contact-line {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.82rem;
    margin-bottom: 0.4rem;
}
.footer-official-new .contact-line i { color: var(--color-accent-teal); width: 16px; margin-top: 4px; }

/* ===== Back to top ===== */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 0;
    background: var(--color-accent-gold);
    color: #000;
    border: none;
    display: none;
    z-index: 1000;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, .3);
}

/* ===== App page (port từ web-2/app) ===== */
:root {
    --navy: #0b1120;
    --deep-blue: #060b1a;
    --gold: #c9a84c;
    --gold-light: #f5d78c;
    --border-glass: rgba(148, 163, 184, 0.12);
    --radius-xl: 20px;
    --radius-lg: 16px;
    --shadow-elevated: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);
}
.section-padding { padding: 90px 0; }
.card-elevated {
    background: var(--navy);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-elevated);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.card-elevated:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow), var(--shadow-elevated);
    border-color: rgba(201, 168, 76, 0.2);
}
.feature-icon-large {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: 20px;
}
.badge-cert {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    background: rgba(201, 168, 76, 0.12);
    color: var(--gold-light);
    border: 1px solid rgba(201, 168, 76, 0.25);
}
.stat-value {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, #c9a84c 0%, #f5d78c 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.divider-gold {
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, var(--gold) 50%, transparent 100%);
    border: none;
    margin: 0 auto;
    width: 80px;
}
.tracking-wider { letter-spacing: 0.08em; }
@media (max-width: 768px) {
    .section-padding { padding: 56px 0; }
}

/* biến text cho inline style port từ web-2/app */
:root { --text-secondary: #94a3b8; --text-muted: #64748b; --text-primary: #f1f5f9; }