/* Trợ Lý Giao Thông Online - Professional Styles */

/* Import Bootstrap Icons - Multiple CDN fallbacks */
@import url('https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.css');
@import url('https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.11.3/bootstrap-icons.min.css');
@import url('https://unpkg.com/bootstrap-icons@1.11.3/font/bootstrap-icons.css');

/* Icon Fallbacks */
.bi::before {
    font-family: "bootstrap-icons" !important;
}

.bi {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    line-height: 1;
}

/* Ensure icons are visible */
.bi-sm { font-size: 0.875rem; }
.bi-lg { font-size: 1.25rem; }
.bi-xl { font-size: 1.5rem; }

/* Specific icon fallbacks */
.bi-facebook::before { content: "\f344"; }
.bi-twitter::before { content: "\f5ef"; }
.bi-linkedin::before { content: "\f472"; }
.bi-github::before { content: "\f3ed"; }
.bi-house::before { content: "\f425"; }
.bi-file-earmark-text::before { content: "\f31d"; }
.bi-journal-bookmark::before { content: "\f46e"; }
.bi-info-circle::before { content: "\f431"; }
.bi-envelope::before { content: "\f32f"; }
.bi-moon::before { content: "\f494"; }
.bi-sun::before { content: "\f6ee"; }
.bi-eye::before { content: "\f341"; }
.bi-database::before { content: "\f2a9"; }
.bi-mortarboard::before { content: "\f4a8"; }
.bi-people::before { content: "\f4c7"; }
.bi-person-badge::before { content: "\f4d0"; }
.bi-telephone::before { content: "\f5e3"; }
.bi-robot::before { content: "\f5e4"; }
.bi-search::before { content: "\f52a"; }
.bi-calendar::before { content: "\f1ec"; }
.bi-building::before { content: "\f1ad"; }
.bi-hash::before { content: "\f422"; }

/* Import Vietnamese-friendly Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Source+Serif+Pro:wght@400;600;700&family=Roboto:wght@300;400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans:wght@300;400;500;600;700&family=Open+Sans:wght@300;400;500;600;700&display=swap');

/* Animations for Autocomplete System */
@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

:root {
    /* Professional Color Palette */
    --primary-color: #2C3E50;        /* Deep Blue-Gray */
    --primary-dark: #1A252F;         /* Darker Blue-Gray */
    --accent-color: #E67E22;         /* Professional Orange */
    --accent-light: #F39C12;         /* Light Orange */
    --secondary-color: #34495E;      /* Medium Blue-Gray */
    --success-color: #27AE60;        /* Professional Green */
    --warning-color: #F39C12;        /* Professional Yellow */
    --danger-color: #E74C3C;         /* Professional Red */
    --info-color: #3498DB;           /* Professional Blue */
    
    /* Neutral Colors */
    --dark-color: #2C3E50;           /* Text Color */
    --medium-color: #5D6D7E;         /* Secondary Text */
    --light-color: #ECF0F1;          /* Light Background */
    --white: #FFFFFF;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-500: #ADB5BD;
    --gray-600: #6C757D;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    
    /* Vietnamese-friendly Typography - Modern Sans-serif */
    --font-primary: 'Inter', 'Noto Sans', 'Roboto', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Arial', sans-serif;
    --font-heading: 'Inter', 'Noto Sans', 'Roboto', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Arial', sans-serif;
    --font-secondary: 'Roboto', 'Noto Sans', 'Inter', 'Open Sans', 'Source Sans Pro', sans-serif;
    --font-legal: 'Inter', 'Noto Sans', 'Roboto', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Arial', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Arial', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--gray-100);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Vietnamese text optimization */
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1;
    font-kerning: normal;
    font-variant-ligatures: none;
    /* Better Vietnamese character support */
    font-display: swap;
    unicode-bidi: normal;
    direction: ltr;
}

/* Professional Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    /* Better Vietnamese character rendering */
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1;
    font-kerning: normal;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    font-weight: 600;
}

h5 {
    font-size: 1.125rem;
    font-weight: 600;
}

h6 {
    font-size: 1rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--medium-color);
    line-height: 1.7;
}

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--medium-color);
    line-height: 1.6;
}

.display-1, .display-2, .display-3, .display-4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

/* Professional Header */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) 0;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    min-height: 70px;
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--white) !important;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand img {
    /* Remove white filter to show original logo colors */
    filter: none;
    opacity: 1;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    font-size: 0.85rem;
    margin: 0 var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-sm) !important;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
    white-space: nowrap;
}

.navbar-nav .nav-link:hover {
    color: var(--white) !important;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.navbar-nav .nav-link i {
    margin-right: var(--spacing-xs);
}

/* Navbar collapse responsive */
@media (max-width: 991px) {
    .navbar-nav {
        text-align: center;
    }
    
    .navbar-nav .nav-link {
        margin: 2px 0;
        padding: var(--spacing-sm) !important;
    }
}

/* Fix for fixed-top navbar */
.navbar.fixed-top {
    position: fixed !important;
    top: 0;
    width: 100%;
    z-index: 1030;
}

/* Dark Mode Toggle */
#darkModeToggle {
    border: 2px solid rgba(255, 255, 255, 0.3);
    background: transparent;
    color: var(--white);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

#darkModeToggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-1px);
}

/* Professional Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    color: var(--white);
    padding: 6rem 0 2rem 0;
    margin-top: 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.6;
}

/* Hero Section Content Sizing */
.hero-section .display-4 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    margin-top: 80px; /* Dời tiêu đề xuống 80px */
    color: #ffffff !important;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero-section .lead {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    line-height: 1.6;
    color: #ffffff !important;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.4);
    font-weight: 400;
}

.hero-section .min-vh-100 {
    min-height: auto !important;
}

/* Ensure hero section content is visible */
.hero-section .container {
    padding-top: 2rem;
    padding-bottom: 1rem;
}

/* Page titles spacing to avoid navbar overlap */
.page-title {
    margin-top: 100px; /* Space for fixed navbar */
    padding-top: 2rem;
}

/* Remove unwanted UI elements */
.hero-section * {
    position: relative;
    z-index: 2;
}

/* Hide any potential bubbles or dots */
.hero-section::after {
    display: none !important;
}

/* Ensure clean hero section */
.hero-section .container {
    position: relative;
    z-index: 3;
}

/* Spacing between hero section and main content */
.hero-section + section {
    margin-top: 2rem;
}

.hero-section + .py-5 {
    padding-top: 3rem !important;
}

/* Specific spacing for about, help, faq, privacy pages */
.about-content,
.help-content,
.faq-content,
.privacy-content,
.van-ban-content {
    margin-top: 1rem;
    padding-top: 1rem;
}

/* Index page specific hero section (smaller) */
.index-hero {
    padding: 5rem 0 2rem 0;
}

.index-hero .display-4 {
    font-size: 3.2rem;
    margin-bottom: 1rem;
    line-height: 1.1;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.index-hero .lead {
    font-size: 1.15rem;
    margin-bottom: 2rem;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-content .lead {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

/* Professional Stats */
.hero-stats {
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    transition: all 0.3s ease;
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    transform: translateY(-2px);
}

/* Legal Documents Section */
.legal-documents-section {
    background: var(--gray-100);
}

.legal-documents-preview {
    background: var(--white);
}

.legal-document-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    transition: all 0.3s ease;
    overflow: hidden;
}

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

.legal-document-card .card-body {
    padding: 1.5rem;
}

.legal-document-card .card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    line-height: 1.4;
}

.legal-document-card .card-text {
    font-size: 0.9rem;
    color: var(--medium-color);
    margin-bottom: 0.5rem;
}

.legal-document-card .badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
}

.legal-document-card .btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.legal-document-card .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.stat-item h3 {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-light);
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.stat-item small {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Professional Search Container */
.search-container {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    margin-top: var(--spacing-xl);
    border: 1px solid var(--gray-200);
    position: relative;
    z-index: 10;
}

.search-input {
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.125rem;
    font-weight: 400;
    transition: all var(--transition-normal);
    background: var(--white);
    color: var(--dark-color);
}

.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(230, 126, 34, 0.1);
    outline: none;
}

.search-input::placeholder {
    color: var(--gray-500);
    font-weight: 400;
}

/* Autocomplete Styling */
.autocomplete-container {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid #e0e0e0;
    border-top: none;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    z-index: 99999; /* Higher z-index to overlay form */
    max-height: 300px;
    overflow-y: auto;
    margin-top: -1px; /* Overlap with input border */
    backdrop-filter: blur(10px);
    isolation: isolate;
}

/* Ensure input group has relative positioning for autocomplete */
.input-group {
    position: relative;
    z-index: 1; /* Lower z-index to allow autocomplete overlay */
}

/* Ensure suggestions container is positioned correctly */
.suggestions-container {
    position: relative;
    z-index: 99999; /* High z-index to overlay everything */
}

/* Ensure search form doesn't block autocomplete */
#searchForm {
    position: relative;
    z-index: 1;
}

.autocomplete-item {
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid #f5f5f5;
    transition: background-color 0.15s ease;
    position: relative;
    background: white;
    z-index: 9999;
    font-size: 14px;
    line-height: 1.4;
}

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

.autocomplete-item:hover {
    background-color: #f8f9fa;
    z-index: 9999;
}

.autocomplete-item.selected {
    background-color: #e3f2fd;
    color: #1976d2;
    z-index: 9999;
}

.autocomplete-item.selected .category-badge {
    background-color: rgba(255,255,255,0.2) !important;
    color: white !important;
}

.autocomplete-item.selected .priority-text {
    color: rgba(255,255,255,0.8) !important;
}

.autocomplete-item.selected .quick-answer-badge {
    background-color: rgba(255,255,255,0.2) !important;
    color: white !important;
}

/* Card Header Styling */
.card-header h5 {
    color: white !important;
    font-weight: 600 !important;
    margin: 0 !important;
}

.card-header h5 i {
    color: white !important;
    margin-right: 8px;
}

/* Question Display in Result */
.question-display {
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
    background: rgba(0, 123, 255, 0.05);
    border-radius: 0 8px 8px 0;
    margin-left: -1rem;
    padding-right: 1rem;
}

.question-text {
    font-size: 1.05rem;
    color: var(--primary-color);
    font-weight: 500;
    line-height: 1.4;
}

/* Answer Section */
.answer-section {
    border-left: 3px solid var(--success-color);
    padding-left: 1rem;
    background: rgba(40, 167, 69, 0.05);
    border-radius: 0 8px 8px 0;
    margin-left: -1rem;
    padding-right: 1rem;
}

.answer-text {
    color: var(--dark);
    line-height: 1.6;
}

/* Responsive Autocomplete */
@media (max-width: 768px) {
    .autocomplete-container {
        max-height: 300px;
        margin: 8px -16px 0 -16px;
        border-radius: 0 0 8px 8px;
    }
    
    .autocomplete-item {
        padding: 10px 12px;
    }
    
    .autocomplete-item .category-badge {
        font-size: 10px;
        padding: 1px 4px;
    }
    
    .autocomplete-item .quick-answer-badge {
        font-size: 9px;
        padding: 3px 6px;
    }
}

.search-btn {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    color: var(--white);
    font-weight: 600;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 100%);
}

.search-btn:active {
    transform: translateY(0);
}

/* Professional Suggestions */
.suggestions-container {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-height: 300px;
    overflow-y: auto;
}

.suggestion-item {
    padding: var(--spacing-md) var(--spacing-xl);
    cursor: pointer;
    border-bottom: 1px solid var(--gray-200);
    transition: background-color var(--transition-fast);
    color: var(--dark-color);
    font-size: 0.95rem;
}

.suggestion-item:hover,
.suggestion-item.active {
    background: var(--gray-100);
    color: var(--accent-color);
}

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

/* Professional Quick Examples */
.quick-examples {
    margin-top: var(--spacing-lg);
}

.quick-examples small {
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
}

.example-btn {
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    margin: var(--spacing-xs);
    text-align: left;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
    line-height: 1.4;
}

.example-btn:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Professional Features Section */
.features-section {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-normal);
    height: 100%;
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.feature-card .icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-lg);
    display: block;
}

.feature-card h5 {
    font-family: var(--font-primary);
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--medium-color);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* Professional Cards */
.card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    background: var(--white);
}

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

.card-header {
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-header h5 {
    margin-bottom: 0;
    font-weight: 600;
    color: var(--dark-color);
}

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

/* Professional Answer Styling */
.answer-text {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    color: var(--gray-800);
}

.answer-text p {
    margin-bottom: var(--spacing-md);
}

.answer-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

.answer-text em {
    color: var(--secondary-color);
    font-style: italic;
}

/* Professional Buttons */
.btn {
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: all var(--transition-normal);
    border: none;
    font-size: 0.95rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

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

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border: 2px solid var(--gray-400);
    color: var(--gray-600);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--gray-600);
    color: var(--white);
    border-color: var(--gray-600);
}

/* Professional Badges */
.badge {
    font-weight: 500;
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.bg-success {
    background: var(--success-color) !important;
}

.bg-warning {
    background: var(--warning-color) !important;
}

.bg-danger {
    background: var(--danger-color) !important;
}

.bg-info {
    background: var(--info-color) !important;
}

.bg-secondary {
    background: var(--gray-500) !important;
}

/* Professional Footer */
.footer {
    background: var(--primary-color);
    color: #ffffff;
    padding: var(--spacing-3xl) 0 var(--spacing-xl) 0;
    margin-top: var(--spacing-3xl);
}

/* Ensure all Bootstrap Icons are visible */
.bi {
    display: inline-block !important;
    font-style: normal !important;
    font-variant: normal !important;
    text-rendering: auto !important;
    line-height: 1 !important;
    color: inherit !important;
}

.bi::before {
    font-family: "bootstrap-icons" !important;
    font-weight: normal !important;
    color: inherit !important;
}

/* Navigation icons specific */
.navbar .bi {
    color: rgba(255, 255, 255, 0.9) !important;
}

.navbar .bi::before {
    color: rgba(255, 255, 255, 0.9) !important;
}

.footer h5,
.footer h6 {
    color: #ffffff;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.footer p {
    color: #e8f0fe;
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.footer .text-muted {
    color: #e0e6ed !important;
    transition: color 0.3s ease;
}

.footer .text-muted:hover {
    color: #ffffff !important;
}

.footer a {
    color: #d1dae3;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.footer .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    margin-right: var(--spacing-sm);
    transition: all var(--transition-normal);
}

.footer .social-links a:hover {
    background: var(--accent-color);
    transform: translateY(-2px);
}

/* Professional Animations */
.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Professional Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s ease-in-out infinite;
}

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

/* Professional Search History Sidebar */
.search-history-sidebar {
    width: 280px;
    max-height: 400px;
    overflow-y: auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: 1000;
    display: none; /* Hidden by default */
}

/* Show sidebar only on very large screens */
@media (min-width: 1600px) {
    .search-history-sidebar {
        display: block;
    }
}

.search-history-sidebar .card-header {
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-md);
}

.search-history-sidebar .card-body {
    padding: var(--spacing-md);
}

/* Professional Results */
.result-summary {
    margin-bottom: var(--spacing-xl);
}

.result-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.answer-content {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--dark-color);
}

.result-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.citations-section {
    margin-top: var(--spacing-xl);
}

.citation-item {
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-normal);
}

.citation-item:hover {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    border-color: var(--accent-color);
}

.citation-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.citation-title {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0;
}

.citation-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-end;
}

.citation-source {
    margin-bottom: var(--spacing-sm);
}

.citation-source strong {
    color: var(--primary-color);
    font-weight: 600;
}

.citation-text {
    color: var(--medium-color);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.citation-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* News Article Styles */
.news-article {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.article-header {
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.article-content {
    padding: var(--spacing-xl);
    line-height: 1.8;
    font-size: 1.1rem;
}

.article-content h2,
.article-content h3,
.article-content h4 {
    color: var(--primary-color);
    font-family: var(--font-heading);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.article-content p {
    margin-bottom: var(--spacing-lg);
    color: var(--dark-color);
}

.article-content ul,
.article-content ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.article-content li {
    margin-bottom: var(--spacing-sm);
    color: var(--dark-color);
}

.article-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--gray-100);
}

/* Sidebar Styles */
.sidebar .card {
    border: none;
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius-lg);
}

.sidebar .card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
    border: none;
}

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

/* Alert Styles for News */
.alert {
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
    color: #0c5460;
    border-left: 4px solid var(--info-color);
}

/* Badge Styles */
.badge {
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
}

/* Professional Dark Mode */
.dark-mode {
    --dark-color: #E8EAED;
    --medium-color: #9AA0A6;
    --light-color: #202124;
    --white: #1A1A1A;
    --gray-100: #2D2D2D;
    --gray-200: #3C4043;
    --gray-300: #5F6368;
    --gray-400: #80868B;
    --gray-500: #9AA0A6;
    --gray-600: #BDC1C6;
    --gray-700: #DADCE0;
    --gray-800: #E8EAED;
    --gray-900: #F8F9FA;
}

.dark-mode .navbar {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.dark-mode .hero-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 50%, var(--accent-color) 100%);
}

.dark-mode .search-container {
    background: var(--gray-100);
    border-color: var(--gray-200);
}

.dark-mode .search-input {
    background: var(--gray-100);
    border-color: var(--gray-200);
    color: var(--dark-color);
}

.dark-mode .card {
    background: var(--gray-100);
    border-color: var(--gray-200);
}

.dark-mode .feature-card {
    background: var(--gray-100);
    border-color: var(--gray-200);
}

/* Smooth transitions for results section */
#resultsSection {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    visibility: hidden;
    display: none; /* Hide completely when not needed */
}

#resultsSection.show {
    opacity: 1;
    visibility: visible;
    display: block; /* Show when needed */
}

/* Professional Responsive Design */

@media (max-width: 768px) {
    .hero-section {
        padding: 5rem 0 2rem 0;
    }
    
    .hero-section .display-4 {
        font-size: 2.5rem;
        margin-top: 60px; /* Dời tiêu đề xuống 60px trên mobile */
    }
    
    .hero-section .lead {
        font-size: 1.1rem;
    }
    
    .search-container {
        padding: var(--spacing-xl);
    }
    
    .index-hero {
        padding: 4rem 0 2rem 0;
    }
    
    /* Navbar responsive */
    .navbar-nav .nav-link {
        font-size: 0.9rem;
        margin: 0 1px;
        padding: var(--spacing-xs) var(--spacing-sm) !important;
        white-space: nowrap;
    }
    
    .navbar-brand {
        font-size: 1.4rem;
    }
    
    /* Ensure all menu items are visible */
    .navbar-nav {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .navbar-nav::-webkit-scrollbar {
        display: none;
    }
    
    .features-section {
        padding: var(--spacing-2xl) 0;
    }
    
    .feature-card {
        margin-bottom: var(--spacing-lg);
    }
    
    .search-history-sidebar {
        display: none;
    }
}

@media (max-width: 1200px) {
    .search-history-sidebar {
        right: 10px;
        width: 250px;
    }
}

@media (max-width: 1400px) {
    .search-history-sidebar {
        position: relative;
        top: auto;
        right: auto;
        transform: none;
        width: 100%;
        margin-top: var(--spacing-xl);
        max-height: 200px;
        display: none !important;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .search-container {
        padding: var(--spacing-lg);
    }
    
    .stat-item h3 {
        font-size: 2rem;
    }
}

/* Professional Utilities */
.text-gradient {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-hover {
    transition: box-shadow var(--transition-normal);
}

.shadow-hover:hover {
    box-shadow: var(--shadow-lg);
}

.border-gradient {
    border: 2px solid;
    border-image: linear-gradient(135deg, var(--accent-color), var(--accent-light)) 1;
}

/* Professional Form Elements */
.form-control {
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background: var(--white);
    color: var(--dark-color);
}

/* Results Section Styling */
#resultsSection {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-top: 1px solid var(--gray-200);
    border-bottom: 1px solid var(--gray-200);
}

#resultsContainer {
    min-height: 200px;
    transition: all var(--transition-normal);
}

.result-summary {
    margin-bottom: var(--spacing-lg);
}

.result-summary .card {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-lg);
}

.result-summary .card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
}

.citations-section {
    margin-top: var(--spacing-lg);
}

.citations-section .card {
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
}

.citation-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
    transition: background-color var(--transition-normal);
}

.citation-item:hover {
    background-color: var(--gray-50);
}

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

.answer-content {
    line-height: 1.6;
    font-size: 1.1rem;
    color: var(--dark-color);
}

.answer-content p {
    margin-bottom: var(--spacing-md);
}

.answer-content strong {
    color: var(--primary-color);
    font-weight: 600;
}

.result-meta .badge {
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
}

.result-actions .btn {
    margin-right: var(--spacing-sm);
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(230, 126, 34, 0.1);
    outline: none;
}

.form-control::placeholder {
    color: var(--gray-500);
}

/* Professional Alert Styles */
.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-weight: 500;
    border-left: 4px solid;
}

.alert-warning {
    background: rgba(243, 156, 18, 0.1);
    border-left-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-danger {
    background: rgba(231, 76, 60, 0.1);
    border-left-color: var(--danger-color);
    color: var(--danger-color);
}

.alert-success {
    background: rgba(39, 174, 96, 0.1);
    border-left-color: var(--success-color);
    color: var(--success-color);
}

.alert-info {
    background: rgba(52, 152, 219, 0.1);
    border-left-color: var(--info-color);
    color: var(--info-color);
}

/* Search suggestions overlay in examples area */
.search-suggestions-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 16px;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    display: none;
}

.search-suggestions-header {
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e0e0e0;
}

.search-suggestions-header small {
    color: #666;
    font-weight: 500;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.search-suggestion-item {
    padding: 12px;
    margin-bottom: 8px;
    background: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.search-suggestion-item:hover {
    background: #e3f2fd;
    border-color: #2196f3;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.2);
}

.search-suggestion-item:last-child {
    margin-bottom: 0;
}

.suggestion-text {
    font-size: 14px;
    color: #333;
    margin-bottom: 4px;
    line-height: 1.4;
}

.suggestion-category {
    font-size: 11px;
    color: #666;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.suggestion-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: #ff9800;
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 600;
}

/* Ensure examples container has relative positioning */
.quick-examples {
    position: relative;
}