/* ================================
   TATA MOTORS - ENTERPRISE UI STYLESHEET
   Vehicle Service Assistant Application
   ================================ */

/* ===== CSS Variables ===== */
:root {
    /* Tata Motors Brand Colors - Updated to Blue/Turquoise/Light Green */
    --primary-color: #0066CC;        /* Tata Blue */
    --primary-dark: #004C99;         /* Darker Blue */
    --primary-light: #3385FF;        /* Light Blue */
    --secondary-color: #00A693;      /* Tata Turquoise */
    --accent-color: #66CC99;         /* Light Green */
    --accent-gradient: linear-gradient(135deg, #0066CC 0%, #00A693 100%);
    
    /* Neutral Colors */
    --text-primary: #2D3748;
    --text-secondary: #4A5568;
    --text-muted: #718096;
    --border-color: #E2E8F0;
    --bg-light: #F7FAFC;
    --bg-white: #FFFFFF;
    --success-color: #22C55E;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
}

/* ===== Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--bg-light);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.app-header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.header-left h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

/* Logo Styles */
.logo-left, .logo-right {
    height: 60px;
    width: auto;
    object-fit: contain;
}

.header-center {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.header-center h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.header-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.header-middle {
    display: flex;
    align-items: center;
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.user-email {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.btn-menu {
    background: transparent;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
}

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

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    display: none;
    z-index: 1000;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background 0.2s;
}

.dropdown-menu a:hover {
    background: var(--bg-light);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    padding: var(--spacing-lg);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== Demo Mode Warning ===== */
.demo-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #FB923C 100%);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    text-align: center;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    border-radius: 8px;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-title i {
    color: var(--primary-color);
}

/* ===== Collapsible Sections ===== */
.collapsible-section {
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.collapsible-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    user-select: none;
}

.collapsible-header:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #008A78 100%);
}

.collapsible-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.collapsible-toggle {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.collapsible-toggle.expanded {
    transform: rotate(180deg);
}

.collapsible-content {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.collapsible-content.expanded {
    max-height: 2000px;
    padding: var(--spacing-lg);
}

/* ===== Form Styles ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Custom Searchable Dropdown */
.custom-dropdown {
    position: relative;
    display: flex;
}

.custom-dropdown input {
    flex: 1;
    padding-right: 2.5rem;
    cursor: pointer;
}

.custom-dropdown input[readonly] {
    cursor: pointer !important;
    pointer-events: auto !important;
    background: white;
    user-select: none;
}

.custom-dropdown input:focus {
    cursor: text;
}

.dropdown-arrow {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 2.5rem;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.dropdown-arrow:hover {
    color: var(--primary-color);
}

.dropdown-arrow.open {
    transform: rotate(180deg);
}

.dropdown-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 8px 8px;
    max-height: 200px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.dropdown-list.open {
    display: block;
}

.dropdown-item {
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background 0.2s ease;
    border-bottom: 1px solid #f0f0f0;
}

.dropdown-item:hover {
    background: var(--bg-light);
}

.dropdown-item.selected {
    background: var(--primary-color);
    color: white;
}

.dropdown-item.hidden {
    display: none;
}

.dropdown-list::-webkit-scrollbar {
    width: 8px;
}

.dropdown-list::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.dropdown-list::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.form-group small {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Buttons ===== */
.btn-primary,
.btn-secondary,
.btn-print {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #008A78 100%);
    box-shadow: 0 6px 16px rgba(0, 102, 204, 0.4);
    transform: translateY(-2px);
}

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

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

.btn-print {
    background: var(--success-color);
    color: white;
    opacity: 0.5;
    pointer-events: none;
}

.btn-print.enabled {
    opacity: 1;
    pointer-events: auto;
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.btn-print.enabled:hover {
    background: #16A34A;
    box-shadow: 0 6px 16px rgba(34, 197, 94, 0.4);
    transform: translateY(-2px);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    background: white;
    padding: var(--spacing-xl);
    border-radius: 12px;
    text-align: center;
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin: var(--spacing-md) 0;
    min-height: 1.5rem;
}

.progress-bar {
    width: 300px;
    height: 8px;
    background: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    margin: var(--spacing-md) auto 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 10px;
    width: 0%;
    transition: width 0.5s ease;
}

/* ===== Results Sections ===== */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.metric-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: var(--spacing-md);
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    color: white;
}

.metric-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.details-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.details-table th,
.details-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.details-table th {
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-light);
}

/* ===== Scrollable Table Container ===== */
.table-scroll-container {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-top: 0.5rem;
}

.table-scroll-container::-webkit-scrollbar {
    width: 8px;
}

.table-scroll-container::-webkit-scrollbar-track {
    background: var(--bg-light);
    border-radius: 4px;
}

.table-scroll-container::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.table-scroll-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.table-scroll-container .details-table {
    margin-bottom: 0;
    border: none;
}

.table-scroll-container .details-table thead th {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--bg-light);
    box-shadow: 0 2px 2px -1px rgba(0, 0, 0, 0.1);
}

/* ===== Checklist Items ===== */
.checklist-container {
    margin-top: var(--spacing-md);
}

.checklist-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--bg-light);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.checklist-item:hover {
    background: #F0F7FF;
    border-color: var(--primary-color);
}

.checklist-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
    margin-top: 0.25rem;
}

.checklist-text {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.checklist-item input[type="checkbox"]:checked + .checklist-text {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* ===== Accordion Styles (for Troubleshooting Checklist) ===== */
.accordion-container {
    margin-top: 1rem;
}

.accordion-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.accordion-header {
    padding: 1rem;
    background: var(--bg-light);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background 0.2s;
}

.accordion-header:hover {
    background: #E0F2FE;
}

.accordion-header span {
    font-weight: 600;
    color: var(--text-primary);
}

.accordion-header i {
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-content.active {
    max-height: 1000px;
    padding: 1rem;
}

/* ===== Fault Tree Visualization ===== */
.fault-tree {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: #F8FAFC;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    max-height: 600px;
    overflow-y: auto;
    line-height: 1.6;
}

.fault-tree-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.fault-tree-branch {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-block;
    margin: 0.25rem 0;
}

.fault-tree-leaf {
    color: var(--text-secondary);
    display: inline-block;
    margin: 0.25rem 0;
}

.fault-code-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    margin: 0.25rem 0.5rem 0.25rem 0;
    background: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.fault-code-badge.primary {
    background: var(--error-color);
}

.fault-code-badge.secondary {
    background: var(--secondary-color);
}

/* ===== Fault Tree Node Types ===== */
.fault-tree .fa-link {
    color: #059669;
    margin-right: 0.25rem;
}

.fault-tree .fa-code-branch {
    color: #DC2626;
    margin-right: 0.25rem;
}

.fault-tree strong {
    display: block;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

/* ===== Print Styles ===== */
@media print {
    .app-header,
    .form-actions,
    .btn-print,
    .collapsible-toggle {
        display: none !important;
    }
    
    .collapsible-content {
        max-height: none !important;
        padding: var(--spacing-lg) !important;
    }
    
    .card,
    .collapsible-section {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    body {
        background: white;
    }
}

/* ===== Footer ===== */
.app-footer {
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ===== Login Page ===== */
.login-page {
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.background-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(1deg); }
    66% { transform: translateY(10px) rotate(-1deg); }
}

.login-container {
    position: relative;
    z-index: 1;
    max-width: 400px;
    width: 100%;
    margin: 0 var(--spacing-md);
}

.login-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-header h1 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
}

.btn-microsoft {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 1rem 2rem;
    background: white;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    width: 100%;
    justify-content: center;
    transition: all 0.3s;
}

.btn-microsoft:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
    transform: translateY(-2px);
}

.login-info {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: #FEF3C7;
    border-left: 4px solid var(--warning-color);
    border-radius: 0 8px 8px 0;
    text-align: left;
}

.login-info i {
    color: var(--warning-color);
    margin-right: 0.5rem;
}

.login-footer {
    margin-top: var(--spacing-xl);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .header-left,
    .header-middle,
    .header-right {
        justify-content: center;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary,
    .btn-print {
        width: 100%;
        justify-content: center;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}