:root {
    --primary-color: #198754; /* Green */
    --primary-dark: #146c43;
    --secondary-color: #c9a227; /* Light Gold */
    --bg-light: #f4f6f9;
    --text-dark: #333333;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --sidebar-bg: #ffffff;
    --sidebar-text: #333333;
    --sidebar-active: #198754;
    --sidebar-active-bg: rgba(25, 135, 84, 0.1);
    --border-radius: 12px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body {
    font-family: 'Sarabun', 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
}

/* Premium Login Page */
.login-page {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(25,135,84,0.1) 0%, rgba(201,162,39,0.1) 100%);
}

.login-card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    max-width: 450px;
    width: 100%;
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo img {
    height: 80px;
    margin-bottom: 1rem;
}

.login-logo h4 {
    color: var(--primary-color);
    font-weight: 700;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 8px;
    padding: 0.6rem 1.2rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(25, 135, 84, 0.2);
}

.form-control {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    border-color: #dee2e6;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(25, 135, 84, 0.25);
}

/* Admin Layout */
#wrapper {
    display: flex;
    width: 100%;
    align-items: stretch;
}

#sidebar {
    min-width: 260px;
    max-width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    transition: all 0.3s;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
    z-index: 1000;
    height: 100vh;
    position: sticky;
    top: 0;
    overflow-y: auto;
}

#sidebar .sidebar-header {
    padding: 20px;
    background: var(--sidebar-bg);
    border-bottom: 1px solid #eee;
    text-align: center;
}

#sidebar .sidebar-header h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0;
}

#sidebar ul.components {
    padding: 20px 0;
}

#sidebar ul p {
    color: #fff;
    padding: 10px;
}

#sidebar ul li a {
    padding: 12px 20px;
    font-size: 1rem;
    display: block;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: 0.3s;
    font-weight: 500;
}

#sidebar ul li a i {
    width: 25px;
    text-align: center;
    margin-right: 10px;
    color: var(--primary-color);
}

#sidebar ul li a:hover, #sidebar ul li.active > a {
    color: var(--primary-color);
    background: var(--sidebar-active-bg);
    border-right: 4px solid var(--primary-color);
}

#content {
    width: 100%;
    min-height: 100vh;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
}

.topbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-content {
    padding: 25px;
    flex: 1;
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 1.5rem;
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #f0f0f0;
    padding: 1rem 1.5rem;
    border-radius: calc(var(--border-radius) - 1px) calc(var(--border-radius) - 1px) 0 0 !important;
    font-weight: 600;
}

/* KPI Cards */
.kpi-card {
    display: flex;
    align-items: center;
    padding: 1.5rem;
}

.kpi-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 1rem;
}

.kpi-icon.primary { background: rgba(25, 135, 84, 0.1); color: var(--primary-color); }
.kpi-icon.gold { background: rgba(201, 162, 39, 0.1); color: var(--secondary-color); }
.kpi-icon.blue { background: rgba(13, 110, 253, 0.1); color: #0d6efd; }
.kpi-icon.danger { background: rgba(220, 53, 69, 0.1); color: #dc3545; }

.kpi-details h4 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}
.kpi-details p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Compact, readable navigation for information-dense admin work. */
#sidebar.sidebar {
    --sidebar-width: 244px;
    flex: 0 0 var(--sidebar-width);
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    min-height: 100vh;
    height: 100vh;
    position: sticky;
    top: 0;
    z-index: 1030;
    padding: 14px 10px;
    overflow: hidden;
    background: linear-gradient(180deg, #1b2f2d 0%, #142421 100%) !important;
    box-shadow: 2px 0 14px rgba(15, 35, 30, 0.16);
}

#sidebar .sidebar-brand {
    min-height: 54px;
    padding: 0 8px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
    letter-spacing: -0.01em;
    color: #ffffff;
}

#sidebar .sidebar-nav {
    flex: 1 1 auto;
    min-height: 0;
    min-width: 0;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.35) transparent;
}

#sidebar .sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

#sidebar .sidebar-nav::-webkit-scrollbar-thumb {
    border-radius: 99px;
    background: rgba(255, 255, 255, 0.32);
}

#sidebar .nav-header {
    margin: 17px 8px 6px;
    color: #c9ded4;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

#sidebar .nav-link {
    display: flex;
    align-items: center;
    min-width: 0;
    margin: 1px 0;
    padding: 9px 10px;
    border-radius: 8px;
    color: #f3faf6;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.35;
    white-space: normal;
}

#sidebar .nav-link i.fa-fw {
    width: 1.45rem;
    margin-right: 4px;
    color: #b9ecd0;
}

#sidebar .nav-link:hover,
#sidebar .nav-link.section-active {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.14);
}

#sidebar .nav-link.active {
    color: #15382a;
    background: #f2c96d;
    box-shadow: 0 5px 12px rgba(7, 35, 22, 0.34);
}

#sidebar .nav-link.active i.fa-fw {
    color: #15382a;
}

#sidebar .nav-link:focus-visible {
    outline: 2px solid #f2c96d;
    outline-offset: 2px;
}

#sidebar .sidebar-group-link .fa-chevron-down {
    margin-left: 8px;
    transition: transform 0.2s ease;
}

#sidebar .sidebar-group-link[aria-expanded="true"] .fa-chevron-down {
    transform: rotate(180deg);
}

#sidebar .sidebar-submenu {
    margin: 2px 0 5px 12px;
    padding-left: 8px;
    border-left: 1px solid rgba(168, 216, 194, 0.28);
}

#sidebar .sidebar-submenu .nav-link {
    padding: 7px 8px;
    color: #d8eee4 !important;
    font-size: 0.84rem;
    font-weight: 500;
}

#sidebar .sidebar-submenu .nav-link i {
    color: #9fe0bc;
}

#sidebar .sidebar-submenu .nav-link:hover {
    color: #ffffff !important;
}

@media (max-width: 767.98px) {
    #sidebar.sidebar {
        position: fixed;
        left: 0;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
    }

    #sidebar.sidebar.sidebar-open {
        transform: translateX(0);
    }

    .page-content {
        padding: 18px;
    }
}