:root {
    --primary-color: #0d47a1; 
    --accent-color: #ffc107; 
    --bg-light: #f8f9fa;
}
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { font-family: 'Sarabun', sans-serif; background-color: var(--bg-light); color: #333; }
h1, h2, h3, h4, h5, h6, .nav-link, .btn { font-family: 'Prompt', sans-serif; }

/* Navbar & Header */
.navbar-custom { background-color: #ffffff; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
.nav-link { font-weight: 500; color: #333; transition: color 0.3s; }
.nav-link:hover, .nav-link.active { color: var(--primary-color) !important; font-weight: 600; }

/* Hero Section */
.carousel-item img { height: 450px; object-fit: cover; filter: brightness(0.6); }
.carousel-caption { bottom: 20%; }

/* Icon Grid */
.quick-link-card { background: #fff; border-radius: 12px; padding: 25px 15px; text-align: center; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border: 1px solid #eee; transition: all 0.3s; height: 100%; display: block; text-decoration: none; color: #333; }
.quick-link-card:hover { transform: translateY(-5px); box-shadow: 0 8px 15px rgba(13, 71, 161, 0.15); border-color: var(--primary-color); color: var(--primary-color); }
.quick-link-icon { font-size: 2.5rem; color: var(--primary-color); margin-bottom: 15px; }

/* News Card */
.news-card { border: none; border-radius: 10px; overflow: hidden; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: transform 0.3s; }
.news-card:hover { transform: translateY(-5px); }

/* Stats */
.stats-section { background-color: var(--primary-color); color: white; padding: 60px 0; border-radius: 15px; }
.stat-item i { font-size: 3rem; color: var(--accent-color); margin-bottom: 15px; }
.stat-number { font-size: 2.5rem; font-family: 'Prompt', sans-serif; font-weight: 700; }

footer { background-color: #0a3578; color: white; padding: 40px 0 20px; }
footer a { color: #ccc; text-decoration: none; }
footer a:hover { color: var(--accent-color); }
.section-title { border-start: 4px solid var(--primary-color); padding-left: 15px; font-weight: 700; margin-bottom: 30px; }

/* Page Header */
.page-header { background-color: var(--primary-color); color: white; padding: 30px 0; margin-bottom: 30px; border-bottom: 5px solid var(--accent-color); }
.breadcrumb-item a { color: rgba(255,255,255,0.8); text-decoration: none; }
.breadcrumb-item a:hover { color: white; }
.breadcrumb-item.active { color: var(--accent-color); }

/* Category Sidebar */
.list-group-item { font-family: 'Prompt', sans-serif; font-size: 0.95rem; border: none; padding: 12px 20px; margin-bottom: 5px; border-radius: 8px !important; transition: all 0.2s; }
.list-group-item:hover { background-color: #e3f2fd; color: var(--primary-color); }
.list-group-item.active { background-color: var(--primary-color); color: white; border-color: var(--primary-color); box-shadow: 0 4px 6px rgba(13, 71, 161, 0.2); }
.list-group-item i { width: 25px; text-align: center; margin-right: 10px; }

/* Document Table */
.doc-card { background: #fff; border-radius: 12px; padding: 25px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border: 1px solid #eee; }
.table > :not(caption) > * > * { padding: 15px 10px; border-bottom-color: #f0f0f0; }
.table-hover tbody tr:hover { background-color: #f8faff; transition: background-color 0.2s; }
.doc-title { font-weight: 600; color: var(--primary-color); text-decoration: none; font-size: 1.05rem; }
.doc-title:hover { text-decoration: underline; }
.doc-meta { font-size: 0.85rem; color: #6c757d; display: flex; align-items: center; gap: 15px; margin-top: 5px; }

/* สำหรับเมนูที่มีหมวดหมู่ย่อย */
.list-group-item.has-submenu {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* หมุนลูกศรเมื่อเมนูถูกเปิด */
.list-group-item[aria-expanded="true"] i.fa-chevron-right {
    transform: rotate(90-deg);
    transition: transform 0.2s;
}

/* สไตล์สำหรับเมนูย่อย */
.submenu .list-group-item {
    padding-left: 50px; /* ดันเมนูย่อยเข้าไปข้างใน */
    background-color: #f1f4f9;
    font-size: 0.9rem;
    border-bottom: 1px solid #e9ecef !important;
}

.submenu .list-group-item:hover {
    background-color: #e3f2fd;
}

.list-group-item.has-submenu .fa-chevron-right {
    transition: transform 0.3s ease;
}

.list-group-item.has-submenu:not(.collapsed) .fa-chevron-right {
    transform: rotate(90deg);
}

/* ปรับแต่ง List Group Item พื้นฐาน */
.list-group-item {
    border: none;
    padding: 0.75rem 1.25rem;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    color: #444;
}

/* เมื่อเอาเมาส์ชี้ */
.list-group-item:hover {
    background-color: #f0f4f8;
    color: var(--primary-color);
}

/* สถานะ Active สำหรับเมนูหลักและเมนูย่อย */
.list-group-item.active {
    background-color: #e3f2fd !important; /* สีฟ้าอ่อน */
    color: var(--primary-color) !important; /* สีน้ำเงินเข้ม อบจ. */
    font-weight: 600;
    border-left: 4px solid var(--primary-color) !important; /* แถบสีด้านข้าง */
    border-radius: 0;
}

/* ปรับแต่ง Submenu ให้ดูแยกส่วนชัดเจน */
.submenu .list-group-item {
    padding-left: 3rem; /* ดันตัวอักษรเข้าไปให้ดูเป็นลูก */
    font-size: 0.9rem;
    background-color: #fafafa;
}

.submenu .list-group-item.active {
    background-color: #f1f7fe !important;
    border-left: 4px solid var(--primary-color) !important;
}