:root {
    --primary-color: #0056B3; /* Deep Blue from logo */
    --primary-hover: #004494;
    --secondary-color: #00BFA5; /* Teal/Green from logo */
    --secondary-hover: #00A68F;
    --dark-bg: #111827;
    --light-bg: #F0F4F8; /* Slight blue tint to light bg */
    --white: #FFFFFF;
    --text-main: #1F2937;
    --text-muted: #6B7280;
    --border-color: #E5E7EB;
    --radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font-family: 'Inter', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--light-bg);
    color: var(--text-main);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-hover);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    color: var(--white);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--secondary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navbar */
.navbar {
    background-color: var(--white);
    padding: 1rem 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: var(--font-family);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
}

.alert-error {
    background-color: #FEE2E2;
    color: #B91C1C;
    border: 1px solid #F87171;
}

.alert-success {
    background-color: #D1FAE5;
    color: #047857;
    border: 1px solid #34D399;
}

/* Sidebar Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}
.sidebar {
    width: 260px;
    background-color: var(--white);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    z-index: 1000;
}
.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.sidebar-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--primary-color);
}
.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}
.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}
.sidebar-nav a:hover, .sidebar-nav a.active {
    background-color: var(--light-bg);
    color: var(--primary-color);
    border-right: 4px solid var(--primary-color);
}
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
    background-color: var(--light-bg);
    min-height: 100vh;
}
@media print {
    .sidebar { display: none !important; }
    .main-content { margin-left: 0 !important; padding: 0 !important; background: white !important; }
}