/* 
 * Modern Theme System - Comprehensive Dark/Light Mode with Enhanced UI/UX
 * Includes modern fonts, colors, animations, and responsive design
 */

/* Import Additional Enhancement Files */
@import url('responsive-enhancements.css');
@import url('advanced-animations.css');

/* Import Modern Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Poppins:wght@300;400;500;600;700;800&display=swap');

/* CSS Variables for Light and Dark Themes */
:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
    
    /* Primary Colors */
    --primary: #6366f1;
    --primary-dark: #4338ca;
    --primary-light: #a5b4fc;
    --secondary: #10b981;
    --accent: #f59e0b;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Modern Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing & Sizing */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --card-bg: #1e293b;
    --navbar-bg: rgba(30, 41, 59, 0.95);
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.4);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: clamp(1.125rem, 2vw, 1.25rem); }
h6 { font-size: clamp(1rem, 1.5vw, 1.125rem); }

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
    line-height: 1.7;
}

/* Enhanced Navbar */
.navbar {
    background-color: var(--navbar-bg) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
    position: sticky !important;
    top: 0;
    z-index: 1030;
    transition: var(--transition);
}

.navbar-brand h2 {
    font-family: var(--font-secondary);
    font-weight: 700;
    color: var(--primary) !important;
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    margin: 0;
}

.navbar-nav .nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
    padding: 0.75rem 1rem !important;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    position: relative;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary) !important;
    background-color: var(--bg-secondary);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--primary);
    transition: var(--transition);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 80%;
}

/* Dropdown Enhancements */
.dropdown-menu {
    background-color: var(--card-bg) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--border-radius) !important;
    box-shadow: var(--shadow-hover) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0.5rem !important;
    margin-top: 0.5rem !important;
}

.dropdown-item {
    color: var(--text-primary) !important;
    border-radius: var(--border-radius-sm) !important;
    padding: 0.75rem 1rem !important;
    transition: var(--transition);
    font-weight: 500;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: var(--bg-secondary) !important;
    color: var(--primary) !important;
    transform: translateX(4px);
}

/* Button Enhancements */
.btn {
    font-family: var(--font-primary);
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: none;
    padding: 0.75rem 1.5rem;
    text-transform: none;
    letter-spacing: 0.025em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-card);
}

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

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), #059669);
    color: white;
    box-shadow: var(--shadow-card);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #059669, var(--secondary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    color: white;
}

/* Card System */
.card,
.service-item,
.feature-card {
    background-color: var(--card-bg) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--border-radius) !important;
    box-shadow: var(--shadow-card) !important;
    transition: var(--transition);
    overflow: hidden;
}

.card:hover,
.service-item:hover,
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover) !important;
}

.card-3d {
    position: relative;
    transition: var(--transition);
}

.card-3d::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
    border-radius: var(--border-radius);
    z-index: -1;
}

.card-3d:hover::before {
    opacity: 0.1;
}

/* Enhanced Topbar */
.container-fluid[style*="background: var(--bg-secondary)"] {
    background-color: var(--bg-secondary) !important;
    border-bottom: 1px solid var(--border-color) !important;
}

/* Background Sections */
.bg-light {
    background-color: var(--bg-secondary) !important;
}

/* Text Color Overrides */
.text-dark,
.text-muted {
    color: var(--text-primary) !important;
}

.text-secondary {
    color: var(--text-secondary) !important;
}

.text-black-50 {
    color: var(--text-muted) !important;
}

/* Footer Enhancements */
.footer {
    background: linear-gradient(135deg, #1e293b, #0f172a) !important;
    color: var(--text-primary) !important;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

.footer h4 {
    color: var(--text-primary) !important;
    font-weight: 600;
}

.footer p,
.footer a {
    color: var(--text-secondary) !important;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--primary) !important;
    text-decoration: none;
}

/* Spinner Enhancement */
#spinner {
    background-color: var(--bg-primary);
}

.spinner-grow {
    color: var(--primary) !important;
}

/* Back to Top Button */
.back-to-top {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
    border: none !important;
    border-radius: 50% !important;
    width: 50px !important;
    height: 50px !important;
    box-shadow: var(--shadow-hover) !important;
    transition: var(--transition) !important;
}

.back-to-top:hover {
    transform: translateY(-2px) scale(1.1);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary)) !important;
}

/* Enhanced Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: 1050;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 50%;
    width: 55px;
    height: 55px;
    cursor: pointer;
    box-shadow: var(--shadow-hover);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.theme-toggle:hover {
    transform: translateY(-50%) scale(1.1);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    box-shadow: 0 15px 25px -5px rgba(0, 0, 0, 0.2);
}

.theme-toggle i {
    transition: var(--transition);
}

.theme-toggle:active i {
    transform: rotate(180deg);
}

/* Mobile Responsive Enhancements */
@media (max-width: 768px) {
    .theme-toggle {
        width: 45px;
        height: 45px;
        font-size: 1rem;
        right: 15px;
    }
    
    .navbar-brand h2 {
        font-size: 1rem !important;
    }
    
    .navbar-nav .nav-link {
        padding: 0.5rem 1rem !important;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

/* Smooth Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

/* Intersection Observer Animation Classes */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Enhanced Focus States for Accessibility */
.btn:focus,
.nav-link:focus,
.dropdown-item:focus,
.theme-toggle:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Glassmorphism Effects */
.glass-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
}

[data-theme="dark"] .glass-card {
    background: rgba(30, 41, 59, 0.3);
    border: 1px solid rgba(100, 116, 139, 0.2);
}

/* Enhanced Feature Cards */
.feature-card {
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transform: rotate(-45deg);
    transition: var(--transition);
    opacity: 0;
}

.feature-card:hover::before {
    opacity: 1;
    animation: shimmer 1.5s ease-in-out;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(-45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(-45deg); }
}

/* Image Enhancements */
img {
    transition: var(--transition);
}

img:hover {
    transform: scale(1.02);
}

/* Enhanced Links */
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

/* Form Enhancements */
.form-control {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-control:focus {
    background-color: var(--card-bg);
    border-color: var(--primary);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(99, 102, 241, 0.25);
}

/* Enhanced Box Shadows */
.shadow-sm { box-shadow: var(--shadow-card) !important; }
.shadow { box-shadow: var(--shadow-hover) !important; }
.shadow-lg { box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04) !important; }

/* Print Styles */
@media print {
    .theme-toggle,
    .navbar,
    .footer,
    .back-to-top {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}