/* ===================================
   NOVA CHATBOT - MAIN STYLES
   =================================== */

/* ===================================
   GLOBAL STYLES & VARIABLES
   =================================== */
:root {
    /* Color Palette */
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #764ba2;
    --secondary-color: #f093fb;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --danger-color: #f56565;
    --dark-color: #2d3748;
    --light-color: #f7fafc;
    --muted-color: #718096;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --border-radius: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --border-radius-2xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* ===================================
   BASE STYLES
   =================================== */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: #222;
    background-color: #fff;
    margin: 0;
    padding: 0;
}

/* ===================================
   TYPOGRAPHY
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: #2d2d2d;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--muted-color);
}

a {
    color: #2d6cdf;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: #174ea6;
    text-decoration: none;
}

/* ===================================
   LAYOUT & CONTAINERS
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--spacing-sm));
}

.col {
    flex: 1;
    padding: 0 var(--spacing-sm);
}

/* ===================================
   NAVIGATION
   =================================== */
.navbar {
    background: var(--gradient-primary);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar-brand {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white !important;
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.navbar-nav .nav-item {
    margin: 0 var(--spacing-sm);
}

.navbar-nav .nav-link {
    color: white !important;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.navbar-nav .nav-link:hover {
    color: black !important;
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
}

.navbar-nav .nav-link.active,
.navbar-nav .nav-link:active {
    color: black !important;
    background-color: rgba(255, 255, 255, 0.9);
}

/* Search Bar */
.search-container {
    position: relative;
    max-width: 300px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    padding-left: 2.5rem;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius-xl);
    background-color: #f8f9fa;
    color: #333;
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.search-input::placeholder {
    color: #6c757d;
}

.search-input:focus {
    outline: none;
    background-color: white;
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 0.2rem rgba(var(--bs-primary-rgb), 0.25);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: #6c757d;
    pointer-events: none;
}

/* User Icon */
.user-icon {
    width: 40px;
    height: 40px;
    background-color: rgba(102, 126, 234, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bs-primary);
    font-size: var(--font-size-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
}

.user-icon:hover {
    background-color: rgba(102, 126, 234, 0.2);
    transform: scale(1.05);
    border-color: rgba(102, 126, 234, 0.3);
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

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

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

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

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

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

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
    border-radius: var(--border-radius-lg);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-base);
}

/* ===================================
   CARDS
   =================================== */
.card {
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all var(--transition-normal);
    border: none;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-lg);
    border: none;
}

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

.card-footer {
    padding: var(--spacing-lg);
    background-color: var(--light-color);
    border-top: 1px solid #e2e8f0;
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #e2e8f0;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
}

.form-control.is-valid {
    border-color: var(--success-color);
}

.invalid-feedback {
    display: block;
    color: var(--danger-color);
    font-size: var(--font-size-base);
    margin-top: var(--spacing-xs);
}

.valid-feedback {
    display: block;
    color: var(--success-color);
    font-size: var(--font-size-base);
    margin-top: var(--spacing-xs);
}

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

.text-primary, .navbar-brand, .section-title, .cta-title {
    color: #2d2d2d !important;
}

.text-muted, .section-subtitle, .feature-description, .stat-label, .author-title, .testimonial-text, .policy-content .text-muted, .footer .text-muted {
    color: #555 !important;
}

.text-secondary, .footer a, .navbar-nav .nav-link {
    color: #444 !important;
}

.text-white, .btn-primary, .btn-outline-primary, .hero-title, .hero-subtitle, .cta-section, .cta-card, .hero-section, .feature-icon, .step-icon, .testimonial-card, .chat-header, .chatbot-demo, .stat-number, .stat-label {
    color: #fff !important;
}

.bg-primary { background: var(--gradient-primary) !important; }
.bg-success { background: var(--gradient-success) !important; }
.bg-light { background-color: var(--light-color) !important; }
.bg-dark { background-color: var(--dark-color) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-xs) !important; }
.p-2 { padding: var(--spacing-sm) !important; }
.p-3 { padding: var(--spacing-md) !important; }
.p-4 { padding: var(--spacing-lg) !important; }
.p-5 { padding: var(--spacing-xl) !important; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }

.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }

.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

.rounded { border-radius: var(--border-radius) !important; }
.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-xl { border-radius: var(--border-radius-xl) !important; }

.shadow { box-shadow: var(--shadow) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .navbar-nav {
        flex-direction: column;
        width: 100%;
    }
    
    .navbar-nav .nav-item {
        margin: var(--spacing-xs) 0;
        width: 100%;
    }
    
    .navbar-nav .nav-link {
        display: block;
        text-align: center;
    }
    
    .search-container {
        max-width: 100%;
        margin: var(--spacing-md) 0;
    }
    
    .btn-lg {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-xl); }
}

@media (max-width: 576px) {
    :root {
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
}

/* ===================================
   ANIMATIONS
   =================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* ===================================
   ACCESSIBILITY
   =================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for keyboard navigation */
.btn:focus,
.form-control:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000080;
        --dark-color: #000000;
        --light-color: #ffffff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Ensure all text on dark backgrounds is white */
.cta-section, .cta-card, .hero-section, .chat-header, .feature-icon, .step-icon, .testimonial-card {
    color: #fff !important;
}

/* Muted small text */
small, .text-muted.small, .stat-label, .author-title {
    color: #888 !important;
}

.lead.mb-4 {
    color: #fff !important;
}

.lead.mb-0 {
    color: #fff !important;
}

.nav-link.active,
.navbar-nav .nav-link.active,
.navbar-nav .nav-link:active {
    color: #fff !important;
}