:root {
    /* Font Sizes */
    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.875rem;  /* 14px */
    --font-size-md: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;  /* 18px */
    --font-size-xl: 1.25rem;   /* 20px */
    
    /* Color Scheme */
    --primary: #00a6fb;
    --secondary: #0582ca;
    --dark: #003554;
    --darker: #051923;
    --light: #f8f9fa;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #fd7e14;
    --info: #17a2b8;
    
    /* Layout */
    --navbar-height: 70px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    font-size: var(--font-size-sm);
}

/* Navbar Styles (from sidebar.php header) */
.header {
    height: var(--navbar-height);
    background: #2c3e50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.hospital-logo {
    display: flex;
    align-items: center;
    color: white;
    font-size: var(--font-size-md);
    font-weight: bold;
}

.hospital-logo i {
    margin-right: 6px;
    font-size: var(--font-size-lg);
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-menu ul.main-menu {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: nowrap;
}

.nav-menu ul.main-menu > li {
    position: relative;
    margin: 0 5px;
}

.nav-menu ul.main-menu > li > a {
    color: white;
    text-decoration: none;
    padding: 6px 8px;
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    transition: background-color 0.3s;
    white-space: nowrap;
}

.nav-menu ul.main-menu > li > a:hover {
    background-color: #34495e;
    border-radius: 4px;
}

.nav-menu ul.main-menu > li > a i {
    margin-right: 4px;
    font-size: var(--font-size-sm);
}

.submenu {
    display: none;
    position: absolute;
    top: 0%;
    left: 0;
    background-color: #34495e;
    min-width: 0px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    border-radius: 4px;
    z-index: 1001;
}

.has-submenu.active .submenu {
    display: block;
}

.submenu li a {
    color: white;
    text-decoration: none;
    padding: 6px 10px;
    display: block;
    font-size: var(--font-size-xs);
}

.submenu li a:hover {
    background-color: #2c3e50;
}

.menu-item.has-submenu > a .arrow {
    margin-left: 6px;
    font-size: var(--font-size-xs);
    transition: transform 0.3s;
}

.menu-item.has-submenu.active > a .arrow {
    transform: rotate(90deg);
}

.hamburger {
    display: none;
    color: white;
    font-size: var(--font-size-lg);
    cursor: pointer;
}

/* Main Content Styles */
.main-content {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px;
    padding-top: calc(var(--navbar-height) + 20px);
    min-height: 100vh;
    transition: var(--transition);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background-color: #2c3e50;
        flex-direction: column;
        padding: 8px;
    }
    
    .nav-menu.active {
        display: block;
    }
    
    .nav-menu ul.main-menu {
        flex-direction: column;
    }
    
    .nav-menu ul.main-menu > li {
        margin: 4px 0;
    }
    
    .nav-menu ul.main-menu > li > a {
        font-size: var(--font-size-sm);
    }
    
    .submenu {
        position: static;
        background-color: #34495e;
        box-shadow: none;
    }
    
    .hamburger {
        display: block;
    }
    
    .main-content {
        padding-top: calc(var(--navbar-height) + 10px);
    }
}

/* Dashboard Specific Styles */
#dashboard-wrapper {
    width: 100%;
    overflow-y: auto;
    background-color: #f4f7fc;
}

#dashboard-wrapper .dashboard-container {
    font-family: 'Segoe UI', sans-serif;
    padding: 25px;
    width: 100%;
}

#dashboard-wrapper .dashboard-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: #4A4A4A;
}

#dashboard-wrapper .dashboard-header p {
    font-size: 16px;
    color: #7f8c8d;
}

#dashboard-wrapper .dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(0px, 1fr));
    gap: 25px;
}

#dashboard-wrapper .dashboard-card {
    background-color: #ffffff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.2s ease-in-out;
}

#dashboard-wrapper .dashboard-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.kpi-card {
    position: relative;
}

.kpi-card .tooltip {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 10px;
    background-color: #333;
    color: #fff;
    padding: 10px 15px;
    border-radius: 8px;
    z-index: 10;
    width: max-content;
    min-width: 0px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    transition: opacity 0.2s, visibility 0.2s;
    font-size: 13px;
}

.kpi-card:hover .tooltip {
    visibility: visible;
    opacity: 1;
}

.kpi-card .tooltip h4 {
    margin: 0 0 10px 0;
    padding-bottom: 5px;
    border-bottom: 1px solid #555;
    font-size: 14px;
}

.kpi-card .tooltip ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.kpi-card .tooltip li {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
}

.kpi-card .tooltip .name {
    font-weight: 500;
}

.kpi-card .tooltip .details {
    color: #ccc;
}

#dashboard-wrapper .kpi-card {
    display: flex;
    flex-direction: row;
    align-items: center;
}

#dashboard-wrapper .kpi-card .icon {
    font-size: 28px;
    padding: 18px;
    border-radius: 50%;
    margin-right: 20px;
    color: #fff;
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#dashboard-wrapper .kpi-card .info .value {
    font-size: 32px;
    font-weight: 700;
    color: #4A4A4A;
}

#dashboard-wrapper .kpi-card .info .label {
    font-size: 14px;
    color: #7f8c8d;
}

.icon.patients { background-color: #5DADE2; }
.icon.admitted { background-color: #AF7AC5; }
.icon.appointments { background-color: #58D68D; }
.icon.discharges { background-color: #EC7063; }
.icon.ots { background-color: #F5B041; }
.icon.staff { background-color: #76D7C4; }