:root {
    --primary-dark: #002060;
    --accent-yellow: #FFFF00;
    --info-blue: #0070C0;
    --light-bg: #f4f7f9;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
}

body {
    font-family: 'Noto Sans Lao', sans-serif;
    background-color: var(--light-bg);
    color: #333;
    overflow-x: hidden;
    line-height: 1.7; /* ปรับเพื่อการอ่านภาษาลาวที่ดีขึ้น */
}

/* --- Sidebar Logic --- */
#sidebar {
    background-color: var(--primary-dark);
    min-height: 100vh;
    color: white;
    width: var(--sidebar-width);
    transition: all 0.3s ease;
    position: fixed;
    z-index: 1050;
}

#sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

#sidebar.collapsed .sidebar-text, 
#sidebar.collapsed .sidebar-header h6,
#sidebar.collapsed hr {
    display: none;
}

#sidebar.collapsed .nav-link {
    text-align: center;
    padding: 15px 0;
}

#sidebar.collapsed .nav-link i {
    margin-right: 0 !important;
    font-size: 1.4rem;
}

@media (max-width: 767.98px) {
    #sidebar { margin-left: calc(-1 * var(--sidebar-width)); }
    #sidebar.show { margin-left: 0; box-shadow: 5px 0 15px rgba(0,0,0,0.3); }
    .main-content { margin-left: 0 !important; }
}

.main-content {
    transition: all 0.3s ease;
    margin-left: var(--sidebar-width);
    width: auto;
}

.main-content.expanded {
    margin-left: var(--sidebar-collapsed-width);
}

.sidebar .nav-link {
    color: rgba(255,255,255,0.8);
    padding: 12px 20px;
    transition: 0.3s;
    border-left: 4px solid transparent;
    white-space: nowrap;
    overflow: hidden;
    text-decoration: none;
    display: block;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background: rgba(255,255,255,0.1);
    color: var(--accent-yellow);
    border-left: 4px solid var(--accent-yellow);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 1040;
    top: 0;
    left: 0;
}
.sidebar-overlay.show { display: block; }

/* --- UI Elements --- */
.header-card {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #003399 100%);
    color: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.form-select-custom {
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    border-radius: 8px;
}

.form-select-custom option { color: #333; }

.score-btn {
    background-color: white;
    border: 1px solid #dee2e6;
    color: var(--primary-dark);
    border-radius: 12px;
    padding: 12px 8px;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.2s;
    height: 100%;
}

.score-btn:hover {
    transform: translateY(-3px);
    background-color: var(--accent-yellow);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.score-btn-special {
    border: 1px solid rgba(0,0,0,0.05);
    background-color: #f8f9fa;
}

.section-title {
    color: var(--primary-dark);
    font-weight: 700;
    border-left: 5px solid var(--accent-yellow);
    padding-left: 15px;
    margin-bottom: 20px;
}

.card-container {
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}