/* Variables */
:root {
    --primary: #135bec;
    --bg-light: #f6f6f8;
    --bg-dark: #101622;
    --surface-light: #ffffff;
    --surface-dark: #1a1f2e;
    --text-light: #0d121b;
    --text-dark: #f8f9fc;
    --text-muted-light: #4c669a;
    --text-muted-dark: #a0b3d7;
    --border-light: #e2e8f0;
    --border-dark: #334155;
    --success: #28A745;
    --warning: #FFC107;
    --danger: #DC3545;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-light);
    transition: background-color 0.3s, color 0.3s;
}

body.dark {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

/* Container Layout */
.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 256px;
    background-color: var(--surface-light);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

body.dark .sidebar {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-text h1 {
    font-size: 1rem;
    font-weight: 700;
}

.logo-text p {
    font-size: 0.875rem;
    color: var(--text-muted-light);
}

body.dark .logo-text p {
    color: var(--text-muted-dark);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-muted-light);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

body.dark .nav-item {
    color: var(--text-muted-dark);
}

.nav-item:hover {
    background-color: rgba(19, 91, 236, 0.1);
}

.nav-item.active {
    background-color: rgba(19, 91, 236, 0.15);
    color: var(--primary);
    font-weight: 600;
}

.nav-icon {
    font-size: 1.25rem;
}

/* Main Content */
.main-content {
    flex: 1;
    overflow-y: auto;
    background-color: var(--bg-light);
}

body.dark .main-content {
    background-color: var(--bg-dark);
}

.content-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
}

/* Page Header */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.25rem;
    font-weight: 900;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1rem;
    color: var(--text-muted-light);
}

body.dark .page-header p {
    color: var(--text-muted-dark);
}

/* Form Card */
.form-card {
    background-color: var(--surface-light);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    padding: 2rem;
}

body.dark .form-card {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
}

.form-section-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--primary);
}

.form-section-header h2 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--primary);
}

/* Form Grid */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

body.dark .form-group label {
    color: var(--text-dark);
}

.required {
    color: var(--danger);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem;
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    background-color: var(--bg-light);
    color: var(--text-light);
    font-size: 0.875rem;
    font-family: inherit;
    transition: all 0.2s;
}

body.dark .form-group input,
body.dark .form-group select,
body.dark .form-group textarea {
    border-color: var(--border-dark);
    background-color: #1e293b;
    color: var(--text-dark);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(19, 91, 236, 0.1);
}

.form-group input:disabled,
.form-group select:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: var(--border-light);
}

body.dark .form-group input:disabled,
body.dark .form-group select:disabled {
    background-color: rgba(30, 41, 59, 0.5);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Validation Messages */
.error-message {
    font-size: 0.75rem;
    color: var(--danger);
    margin-top: 0.25rem;
    min-height: 1rem;
}

.info-message {
    font-size: 0.75rem;
    color: var(--text-muted-light);
    margin-top: 0.25rem;
}

body.dark .info-message {
    color: var(--text-muted-dark);
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--danger);
}

.form-group.success input,
.form-group.success select {
    border-color: var(--success);
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
    flex-wrap: wrap;
}

body.dark .form-actions {
    border-color: var(--border-dark);
}

.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 2px 4px rgba(19, 91, 236, 0.2);
}

.btn-primary:hover:not(:disabled) {
    background-color: #0d4ac4;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(19, 91, 236, 0.3);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--border-light);
    color: var(--text-light);
}

body.dark .btn-secondary {
    background-color: var(--border-dark);
    color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: var(--text-muted-light);
    color: white;
}

/* Fleet Sidebar */
.fleet-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: sticky;
    top: 2rem;
    height: fit-content;
}

.fleet-card,
.stats-card {
    background-color: var(--surface-light);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

body.dark .fleet-card,
body.dark .stats-card {
    background-color: var(--surface-dark);
    border-color: var(--border-dark);
}

.fleet-card h3,
.stats-card h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: 1rem;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1.125rem;
    height: 1.125rem;
    color: var(--text-muted-light);
}

body.dark .search-icon {
    color: var(--text-muted-dark);
}

.search-box input {
    width: 100%;
    padding: 0.625rem 0.75rem 0.625rem 2.5rem;
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    background-color: var(--bg-light);
    color: var(--text-light);
    font-size: 0.875rem;
    outline: none;
}

body.dark .search-box input {
    border-color: var(--border-dark);
    background-color: #1e293b;
    color: var(--text-dark);
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(19, 91, 236, 0.1);
}

/* Fleet List */
.fleet-list {
    max-height: 500px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.fleet-item {
    padding: 1rem;
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
    cursor: pointer;
}

body.dark .fleet-item {
    border-color: var(--border-dark);
}

.fleet-item:hover {
    background-color: var(--bg-light);
    transform: translateX(4px);
}

body.dark .fleet-item:hover {
    background-color: rgba(30, 41, 59, 0.3);
}

.fleet-item.selected {
    border-color: var(--primary);
    background-color: rgba(19, 91, 236, 0.05);
}

.fleet-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.fleet-icon {
    font-size: 1.875rem;
}

.fleet-details h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.125rem;
}

.fleet-details p {
    font-size: 0.75rem;
    color: var(--text-muted-light);
}

body.dark .fleet-details p {
    color: var(--text-muted-dark);
}

.fleet-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
}

.status-dot.available {
    background-color: var(--success);
}

.status-dot.assigned {
    background-color: var(--danger);
}

.status-dot.maintenance {
    background-color: var(--warning);
}

.status-text {
    font-size: 0.75rem;
    font-weight: 500;
}

.status-text.available {
    color: var(--success);
}

.status-text.assigned {
    color: var(--danger);
}

.status-text.maintenance {
    color: var(--warning);
}

/* Stats Card */
.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-light);
}

body.dark .stat-item {
    border-color: var(--border-dark);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted-light);
}

body.dark .stat-label {
    color: var(--text-muted-dark);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-value.available {
    color: var(--success);
}

.stat-value.assigned {
    color: var(--danger);
}

.stat-value.maintenance {
    color: var(--warning);
}

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

.modal.show {
    display: flex;
}

.modal-content {
    background-color: var(--surface-light);
    border-radius: 0.75rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

body.dark .modal-content {
    background-color: var(--surface-dark);
}

.modal-content.success {
    text-align: center;
    padding: 3rem 2rem;
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.modal-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.modal-content p {
    color: var(--text-muted-light);
    margin-bottom: 2rem;
}

body.dark .modal-content p {
    color: var(--text-muted-dark);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

body.dark .modal-header {
    border-color: var(--border-dark);
}

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

body.dark .modal-close {
    color: var(--text-muted-dark);
}

.modal-body {
    padding: 1.5rem;
}

/* Loading Overlay */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
}

.loading-overlay.show {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    color: white;
    font-size: 1rem;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 1200px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .fleet-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}