:root {
    --primary-blue: #1a4d7a;
    --dark-blue: #0d2a47;
    --light-blue: #2563a8;
    --accent-orange: #ff6b35;
    --gray-dark: #4a5568;
    --gray-medium: #718096;
    --gray-light: #e2e8f0;
    --white: #ffffff;
    --bg-light: #f7fafc;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--gray-dark);
    background-color: var(--bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-2px);
    color: var(--accent-orange);
}

.logo-icon {
    font-size: 2rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 0.5rem;
}

nav a {
    color: var(--white);
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

nav a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-orange);
    transition: var(--transition);
    transform: translateX(-50%);
}

nav a:hover::before,
nav a.active::before {
    width: 80%;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

nav a.active {
    background-color: rgba(255, 107, 53, 0.2);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    font-weight: 500;
}

.btn-logout {
    background-color: var(--accent-orange);
    border: none;
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.btn-logout:hover {
    background-color: #e55a2b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem 0;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

.page-title {
    font-size: 2.5rem;
    color: var(--dark-blue);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.page-subtitle {
    color: var(--gray-medium);
    font-size: 1.1rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    border: 1px solid var(--gray-light);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--light-blue);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--gray-light);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-blue);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background-color: var(--light-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
    background-color: #e55a2b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--gray-dark);
}

.btn-danger {
    background-color: #dc3545;
    color: var(--white);
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--gray-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(26, 77, 122, 0.1);
}

select.form-control {
    cursor: pointer;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
}

thead {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
    color: var(--white);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-light);
}

tbody tr {
    transition: var(--transition);
}

tbody tr:hover {
    background-color: rgba(26, 77, 122, 0.05);
}

/* Grid Layout */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Stats Cards */
.stat-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--light-blue) 100%);
    color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Filters */
.filters {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.filter-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

/* Alert Messages */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    animation: slideInDown 0.4s ease-out;
}

.alert-success {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-error {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-info {
    background-color: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--gray-light);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

/* Footer */
footer {
    background-color: var(--dark-blue);
    color: var(--white);
    padding: 2rem 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    margin-left: 1.5rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-orange);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .filter-group {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links a {
        margin: 0 0.75rem;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.hidden {
    display: none;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-success {
    background-color: #28a745;
    color: var(--white);
}

.badge-warning {
    background-color: var(--accent-orange);
    color: var(--white);
}

.badge-info {
    background-color: var(--primary-blue);
    color: var(--white);
}