/**
 * Robotics Lab - Main Stylesheet
 * Custom CSS for the robotics lab website
 * 
 * @version 1.0
 * @author RoboticsLab Development Team
 * @created 2025-09-22
 */

/* ===== CSS VARIABLES ===== */
:root {
    --primary-color: #1E40AF;
    --primary-dark: #1E3A8A;
    --primary-light: #3B82F6;
    --secondary-color: #C0C0C0;
    --success-color: #059669;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --info-color: #0EA5E9;
    --light-color: #F8FAFC;
    --dark-color: #0F172A;
    --white: #FFFFFF;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --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;
    
    --border-radius: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --border-radius-2xl: 1rem;
    
    --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-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
    
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    --transition-slow: all 0.5s ease;
}

/* ===== GLOBAL 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: var(--dark-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

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); }

.display-1 { font-size: 4rem; font-weight: 700; }
.display-2 { font-size: 3.5rem; font-weight: 700; }
.display-3 { font-size: 3rem; font-weight: 700; }
.display-4 { font-size: 2.5rem; font-weight: 700; }
.display-5 { font-size: 2rem; font-weight: 700; }

.lead {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--secondary-color);
    text-shadow: 0 0 8px rgba(192, 192, 192, 0.2);
}

.text-primary { color: var(--primary-color) !important; }
.text-secondary { 
    color: var(--secondary-color) !important; 
    text-shadow: 0 0 10px rgba(192, 192, 192, 0.3);
}
.text-success { color: var(--success-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-info { color: var(--info-color) !important; }
.text-light { color: var(--light-color) !important; }
.text-dark { color: var(--dark-color) !important; }

/* ===== BUTTONS ===== */
.btn {
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: none;
    padding: 0.5rem 1rem;
    font-size: var(--font-size-base);
    line-height: 1.5;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border: 1px solid var(--primary-color);
}

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

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

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

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-size-sm);
}

.btn-floating {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.btn-floating.show {
    opacity: 1;
    visibility: visible;
}

/* ===== CARDS ===== */
.card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
}

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

.card-header {
    background-color: var(--light-color);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: var(--light-color);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding: 1rem 1.5rem;
}

/* ===== FORMS ===== */
.form-control {
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 86, 210, 0.25);
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* ===== NAVIGATION ===== */
.navbar {
    padding: 1rem 0;
    transition: var(--transition);
}

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

.navbar-nav .nav-link {
    font-weight: 500;
    color: var(--dark-color) !important;
    padding: 0.5rem 1rem !important;
    transition: var(--transition);
    position: relative;
    display: flex;
    align-items: center;
    vertical-align: baseline;
}

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

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

.navbar-nav .nav-item {
    display: flex;
    align-items: center;
}

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

.dropdown-toggle::after {
    vertical-align: middle;
    margin-left: 0.5rem;
}

.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-lg);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.dropdown-item {
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

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

/* ===== HERO SECTION ===== */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 86, 210, 0.9) 0%, rgba(0, 58, 143, 0.9) 100%);
}

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-down {
    display: inline-block;
    color: var(--white);
    font-size: 24px;
    animation: bounce 2s infinite;
    text-decoration: none;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* ===== SECTIONS ===== */
.section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-subtitle {
    color: var(--secondary-color);
    font-size: var(--font-size-lg);
    margin-bottom: 0;
    text-shadow: 0 0 12px rgba(192, 192, 192, 0.4);
}

/* ===== SERVICE CARDS ===== */
.service-card {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    margin-bottom: 1.5rem;
}

.service-icon i {
    color: var(--primary-color);
    transition: var(--transition);
}

.service-card:hover .service-icon i {
    transform: scale(1.1);
}

/* ===== PROJECT CARDS ===== */
.project-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    position: relative;
    overflow: hidden;
}

.project-image img {
    transition: var(--transition);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 86, 210, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-category {
    position: absolute;
    top: 15px;
    right: 15px;
}

.project-content {
    padding: 1.5rem;
}

/* ===== PRODUCT CARDS ===== */
.product-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    position: relative;
    overflow: hidden;
}

.product-image img {
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 86, 210, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
}

.product-content {
    padding: 1rem;
}

.product-price {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* ===== BLOG CARDS ===== */
.blog-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-image {
    overflow: hidden;
}

.blog-image img {
    transition: var(--transition);
}

.blog-card:hover .blog-image img {
    transform: scale(1.05);
}

.blog-content {
    padding: 1.5rem;
}

.blog-meta {
    margin-bottom: 1rem;
}

/* ===== FOOTER ===== */
.footer-widget h6 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-widget ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-widget ul li {
    margin-bottom: 0.5rem;
}

.footer-widget ul li a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

.footer-widget ul li a:hover {
    color: var(--primary-color);
}

.contact-info i {
    color: var(--primary-color);
    width: 20px;
}

.newsletter-section {
    background: var(--primary-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
}

.newsletter-form .input-group {
    max-width: 400px;
}

.stats-section .stat-item {
    text-align: center;
}

.stats-section .stat-item h4 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-slide-in-left {
    animation: slideInLeft 1s ease-out;
}

.animate-slide-in-right {
    animation: slideInRight 1s ease-out;
}

.animate-slide-in-up {
    animation: slideInUp 1s ease-out;
}

/* ===== UTILITIES ===== */
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { 
    background-color: var(--secondary-color) !important; 
    box-shadow: 0 0 20px rgba(192, 192, 192, 0.2);
}
.bg-success { background-color: var(--success-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-info { background-color: var(--info-color) !important; }
.bg-light { background-color: var(--light-color) !important; }
.bg-dark { background-color: var(--dark-color) !important; }

.text-white { color: var(--white) !important; }
.text-white-50 { color: rgba(255, 255, 255, 0.5) !important; }

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !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; }
.rounded-2xl { border-radius: var(--border-radius-2xl) !important; }

/* ===== LOADING SPINNER ===== */
.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* ===== MOBILE MENU OVERLAY ===== */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1040;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.mobile-menu-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .display-1 { font-size: 2.5rem; }
    .display-2 { font-size: 2.25rem; }
    .display-3 { font-size: 2rem; }
    .display-4 { font-size: 1.75rem; }
    .display-5 { font-size: 1.5rem; }
    
    .hero-section {
        min-height: 80vh;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: var(--font-size-base);
    }
    
    .service-card,
    .project-card,
    .product-card,
    .blog-card {
        margin-bottom: 2rem;
    }
    
    .navbar-nav {
        text-align: center;
        padding: 1rem 0;
    }
    
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem !important;
        display: flex;
        align-items: center;
    }
    
    .navbar-nav .nav-item {
        display: flex;
        align-items: center;
    }
}

@media (max-width: 576px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .hero-content h1 {
        font-size: 1.75rem;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
    
    .hero-buttons .btn:last-child {
        margin-bottom: 0;
    }
    
    .service-card,
    .project-card,
    .product-card,
    .blog-card {
        margin-bottom: 1.5rem;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .navbar,
    .footer,
    .btn,
    .btn-floating,
    .scroll-indicator {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }
    
    .card {
        break-inside: avoid;
    }
}

/* ===== ACCESSIBILITY ===== */
.visually-hidden-focusable:not(:focus):not(:focus-within) {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.visually-hidden-focusable:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: inherit !important;
    margin: inherit !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: inherit !important;
}

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

/* ===== CUSTOM SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-color);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ===== SELECTION STYLES ===== */
::selection {
    background-color: var(--primary-color);
    color: var(--white);
}

::-moz-selection {
    background-color: var(--primary-color);
    color: var(--white);
}