:root {
    --primary-color: #2E7D32;
    --secondary-color: #4CAF50;
    --accent-color: #81C784;
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #f5f5f5;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --error-color: #d32f2f;
    --success-color: #388e3c;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

/* Header */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo img {
    max-height: 50px;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    gap: 20px;
    list-style: none;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Banner */
.banner {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.banner h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.banner p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Calculator Section */
.calculator-section {
    padding: 60px 0;
}

.calculator-card {
    background: var(--white);
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.calculator-card h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 30px;
    text-align: center;
}

/* Form Styles */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-section {
    background: var(--bg-color);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 25px;
}

.form-section h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-section h4 i {
    font-size: 1.2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
}

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

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

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

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

.btn-block {
    display: block;
    width: 100%;
}

.btn-lg {
    padding: 15px 40px;
    font-size: 1.1rem;
}

/* Results */
.result-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    display: none;
}

.result-card.show {
    display: block;
    animation: fadeIn 0.5s ease;
    margin-top: 36px;
}

.result-card h3,
.result-card h2,
.result-card p {
    color: #fff;
}

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

.result-value {
    font-size: 3rem;
    font-weight: 700;
    margin: 20px 0;
}

.result-credits {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.result-cost {
    font-size: 1.3rem;
    opacity: 0.9;
}

.result-actions {
    margin-top: 30px;
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Info Section */
.info-section {
    padding: 60px 0;
    background: var(--white);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.info-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.info-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.info-card h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Footer */
.footer {
    background: var(--text-color);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

.footer p {
    opacity: 0.8;
}

/* Admin Styles */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--primary-color);
    color: var(--white);
    padding: 20px 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 20px;
}

.sidebar-header h2 {
    font-size: 1.3rem;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 5px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: all 0.3s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: rgba(255,255,255,0.1);
    color: var(--white);
    border-left: 3px solid var(--white);
}

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 30px;
    background: var(--bg-color);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h1 {
    color: var(--text-color);
    font-size: 1.8rem;
}

/* Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow);
}

.stat-card h3 {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.stat-card .value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-card .change {
    font-size: 0.85rem;
    margin-top: 5px;
}

.stat-card .change.positive {
    color: var(--success-color);
}

/* Tables */
.table-card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.table-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header h3 {
    color: var(--text-color);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-color);
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.85rem;
    text-transform: uppercase;
}

tr:hover {
    background: var(--bg-color);
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-success {
    background: rgba(56, 142, 60, 0.1);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(255, 152, 0, 0.1);
    color: #f57c00;
}

.badge-danger {
    background: rgba(211, 47, 47, 0.1);
    color: var(--error-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: 15px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    color: var(--text-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* Login Page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.login-card {
    background: var(--white);
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-card h2 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
}

.alert {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-error {
    background: rgba(211, 47, 47, 0.1);
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.alert-success {
    background: rgba(56, 142, 60, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

/* Filters */
.filters-bar {
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.filters-bar .form-group {
    margin-bottom: 0;
    flex: 1;
    min-width: 150px;
}

/* Pagination */
.pagination {
    display: flex;
    gap: 5px;
    justify-content: center;
    padding: 20px;
}

.pagination a,
.pagination span {
    padding: 8px 15px;
    border-radius: 5px;
    text-decoration: none;
    color: var(--text-color);
    background: var(--white);
    border: 1px solid var(--border-color);
}

.pagination a:hover {
    background: var(--primary-color);
    color: var(--white);
}

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

/* Color Picker */
.color-input {
    display: flex;
    gap: 10px;
    align-items: center;
}

.color-input input[type="color"] {
    width: 50px;
    height: 40px;
    padding: 0;
    border: none;
    cursor: pointer;
}

.color-input input[type="text"] {
    flex: 1;
}

/* Loading */
.loading {
    display: none;
    text-align: center;
    padding: 40px;
}

.loading.show {
    display: block;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
        z-index: 1000;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .banner h2 {
        font-size: 1.8rem;
    }
    
    .result-value {
        font-size: 2rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .filters-bar {
        flex-direction: column;
    }
    
    .page-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}