/**
 * OBD2 Fleet Management - Flat Design v3.1
 * Modern, clean, professional interface for fleet management
 * Design: Flat, minimal shadows, clean typography
 */

/* ==================== COLOR PALETTE ==================== */
:root {
    /* Primary Colors - Flat & Professional */
    --primary-blue: #2563EB;
    --primary-blue-hover: #1D4ED8;
    --primary-green: #10B981;
    --primary-green-hover: #059669;
    --primary-red: #EF4444;
    --primary-red-hover: #DC2626;
    --primary-orange: #F59E0B;
    --primary-orange-hover: #D97706;
    --primary-purple: #8B5CF6;
    --primary-purple-hover: #7C3AED;

    /* Neutral Colors */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Chart Colors */
    --chart-blue: #3B82F6;
    --chart-green: #22C55E;
    --chart-yellow: #FACC15;
    --chart-red: #F87171;
    --chart-purple: #A78BFA;
    --chart-orange: #FB923C;

    /* Semantic Colors */
    --success: var(--primary-green);
    --warning: var(--primary-orange);
    --danger: var(--primary-red);
    --info: var(--primary-blue);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows - Minimal for flat design */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-primary: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
}

/* ==================== GLOBAL RESET ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== TOP NAVIGATION ==================== */
.top-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: #FFFFFF;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
    margin-right: var(--spacing-xl);
}

.navbar-brand .logo-icon {
    width: 32px;
    height: 32px;
    background: var(--primary-blue);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    flex: 1;
}

.navbar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--gray-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
}

.navbar-menu a:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.navbar-menu a.active {
    background: var(--primary-blue);
    color: white;
}

.navbar-menu .icon {
    width: 20px;
    height: 20px;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-left: auto;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gray-100);
    border-radius: var(--radius-full);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--primary-blue);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.btn-logout {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-logout:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

/* ==================== MAIN CONTENT ==================== */
.main-wrapper {
    margin-top: 60px;
    padding: var(--spacing-xl);
    max-width: 1600px;
    margin-left: auto;
    margin-right: auto;
}

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    font-size: 1rem;
    color: var(--gray-600);
}

/* ==================== CARDS ==================== */
.card {
    background: #FFFFFF;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    font-size: 0.875rem;
    color: var(--gray-700);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: #FFFFFF;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-blue);
    transition: width 0.2s ease;
}

.stat-card:hover::before {
    width: 6px;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card.blue::before { background: var(--primary-blue); }
.stat-card.green::before { background: var(--primary-green); }
.stat-card.orange::before { background: var(--primary-orange); }
.stat-card.red::before { background: var(--primary-red); }

.stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-icon svg {
    width: 20px;
    height: 20px;
}

.stat-card.blue .stat-icon { background: rgba(37, 99, 235, 0.1); color: var(--primary-blue); }
.stat-card.green .stat-icon { background: rgba(16, 185, 129, 0.1); color: var(--primary-green); }
.stat-card.orange .stat-icon { background: rgba(245, 158, 11, 0.1); color: var(--primary-orange); }
.stat-card.red .stat-icon { background: rgba(239, 68, 68, 0.1); color: var(--primary-red); }

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xs);
}

.stat-change {
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-blue-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: var(--primary-green-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--primary-red-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-warning:hover:not(:disabled) {
    background: var(--primary-orange-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover:not(:disabled) {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 1rem;
}

/* ==================== BADGES ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary-green);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--primary-orange);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--primary-red);
}

.badge-info {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-blue);
}

.badge-gray {
    background: var(--gray-200);
    color: var(--gray-700);
}

/* ==================== TABLES ==================== */
.table-container {
    background: #FFFFFF;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

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

.table thead {
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
}

.table th {
    padding: var(--spacing-md);
    text-align: left;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table td {
    padding: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr {
    transition: background 0.2s ease;
}

.table tbody tr:hover {
    background: var(--gray-50);
}

/* ==================== FORMS ==================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-xs);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--gray-900);
    background: #FFFFFF;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control:disabled {
    background: var(--gray-100);
    cursor: not-allowed;
}

.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--gray-900);
    background: #FFFFFF;
    cursor: pointer;
    transition: all 0.2s ease;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-text {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-top: var(--spacing-xs);
}

/* ==================== ALERTS ==================== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #047857;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #92400E;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #991B1B;
}

.alert-info {
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.3);
    color: #1E40AF;
}

/* ==================== PAGINATION ==================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xl);
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--spacing-sm);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    color: var(--gray-700);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.pagination a:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

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

.pagination .disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ==================== CHARTS ==================== */
.chart-container {
    background: #FFFFFF;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.chart-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
}

.chart-filters {
    display: flex;
    gap: var(--spacing-sm);
}

.chart-wrapper {
    position: relative;
    height: 300px;
}

/* ==================== MODALS ==================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1040;
    backdrop-filter: blur(2px);
}

.modal-content {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

/* ==================== UTILITIES ==================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-primary { color: var(--primary-blue); }
.text-success { color: var(--primary-green); }
.text-danger { color: var(--primary-red); }
.text-warning { color: var(--primary-orange); }
.text-muted { color: var(--gray-500); }

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .main-wrapper {
        padding: var(--spacing-md);
    }

    .navbar-menu {
        display: none;
    }

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

    .page-title {
        font-size: 1.5rem;
    }

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

    .chart-wrapper {
        height: 250px;
    }
}

@media (max-width: 480px) {
    .top-navbar {
        padding: 0 var(--spacing-md);
    }

    .navbar-brand {
        font-size: 1rem;
    }

    .user-name {
        display: none;
    }
}

/* ==================== ICON STANDARDIZATION ==================== */
/* Chuẩn hóa kích thước tất cả SVG icons */
.icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Buttons với icons */
.btn .icon {
    width: 16px;
    height: 16px;
    margin-right: 6px;
}

.btn-sm .icon {
    width: 14px;
    height: 14px;
    margin-right: 4px;
}

.btn-lg .icon {
    width: 18px;
    height: 18px;
    margin-right: 8px;
}

/* Card title icons */
.card-title .icon {
    width: 20px;
    height: 20px;
    margin-right: 8px;
}

/* Navbar icons */
.navbar-menu .icon {
    width: 18px;
    height: 18px;
}

/* ==================== NAVIGATION TABS (Devices) ==================== */
.nav-tabs {
    display: flex;
    gap: 4px;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: var(--spacing-lg);
    padding: 0;
    list-style: none;
}

.nav-item {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 12px 20px;
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--primary-blue);
    background: rgba(37, 99, 235, 0.05);
}

.nav-link.active {
    color: var(--primary-blue);
    border-bottom-color: var(--primary-blue);
    font-weight: 600;
}

/* Secondary button style */
.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-200);
    border-color: var(--gray-400);
    transform: translateY(-1px);
}

/* Animation for spinning icons */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}