/* CSS Custom Properties for Theming */
:root {
    /* Light Theme Colors */
    --primary-blue: #2563eb;
    --primary-blue-hover: #1d4ed8;
    --secondary-blue: #3b82f6;
    --light-blue: #dbeafe;
    --white: #ffffff;
    --light-gray: #f8fafc;
    --medium-gray: #64748b;
    --dark-gray: #334155;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    
    /* Spacing and Layout */
    --container-max-width: 1200px;
    --section-padding: 80px 0;
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary-blue: #3b82f6;
    --primary-blue-hover: #2563eb;
    --secondary-blue: #60a5fa;
    --light-blue: #1e3a8a;
    --white: #0f172a;
    --light-gray: #1e293b;
    --medium-gray: #94a3b8;
    --dark-gray: #cbd5e1;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.4);
}

/* High Contrast Theme */
[data-theme="high-contrast"] {
    --primary-blue: #000000;
    --primary-blue-hover: #333333;
    --secondary-blue: #000000;
    --light-blue: #ffffff;
    --white: #ffffff;
    --light-gray: #ffffff;
    --medium-gray: #000000;
    --dark-gray: #000000;
    --text-primary: #000000;
    --text-secondary: #000000;
    --border-color: #000000;
    --shadow: rgba(0, 0, 0, 0.8);
    --shadow-hover: rgba(0, 0, 0, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--white);
    transition: var(--transition);
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-blue);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--border-radius);
    z-index: 1000;
    transition: var(--transition);
}

.skip-link:focus {
    top: 6px;
}

/* Theme Dropdown */
.theme-dropdown {
    position: relative;
}

.theme-dropdown-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-dropdown-btn:hover,
.theme-dropdown-btn:focus {
    background: var(--light-blue);
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.theme-dropdown-btn[aria-expanded="true"] {
    background: var(--light-blue);
}

.theme-dropdown-btn[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-arrow {
    font-size: 0.8rem;
    transition: var(--transition);
}

.theme-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow);
    min-width: 160px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    list-style: none;
    padding: 0.5rem 0;
    margin: 0.25rem 0 0 0;
}

.theme-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.theme-dropdown-menu li {
    margin: 0;
}

.theme-option {
    width: 100%;
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-option:hover,
.theme-option:focus {
    background: var(--light-blue);
    outline: none;
}

.theme-option.active {
    background: var(--primary-blue);
    color: white;
}

.theme-option.active:hover {
    background: var(--primary-blue-hover);
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header and Navigation */
.header {
    background: var(--white);
    box-shadow: 0 2px 10px var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 999;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    flex-direction: column;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 0;
}

.tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    font-style: italic;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link:focus {
    color: var(--primary-blue);
    outline: none;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: var(--primary-blue);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:focus::after {
    width: 100%;
}

.nav-link.active {
    color: var(--primary-blue);
}

.nav-link:focus {
    color: var(--primary-blue);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    position: relative;
    width: 30px;
    height: 30px;
}

.hamburger-icon,
.close-icon {
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 100vh;
}

.hero-content {
    padding: 0 2rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.cta-button {
    display: inline-block;
    background: var(--primary-blue);
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px var(--shadow);
}

.cta-button:hover,
.cta-button:focus {
    background: var(--primary-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-hover);
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Carousel */
.carousel {
    position: relative;
    height: 500px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 10px 30px var(--shadow);
}

.carousel-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.carousel-nav {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.carousel-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid white;
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
}

.carousel-dot.active {
    background: white;
}

.carousel-dot:hover,
.carousel-dot:focus {
    background: rgba(255, 255, 255, 0.7);
    outline: none;
    transform: scale(1.2);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.carousel-btn:hover,
.carousel-btn:focus {
    background: white;
    transform: translateY(-50%) scale(1.1);
    outline: 2px solid var(--primary-blue);
}

.carousel-prev {
    left: 20px;
}

.carousel-next {
    right: 20px;
}

/* Section Styles */
section {
    padding: var(--section-padding);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 3rem;
}

/* Services Section */
.services {
    background: var(--light-gray);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.service-card:hover,
.service-card:focus-within {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-hover);
}

.service-card h3 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Why Choose Us Section */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.benefit-item {
    text-align: center;
    padding: 1.5rem;
}

.benefit-item h3 {
    font-size: 1.3rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.benefit-item p {
    color: var(--text-secondary);
}

/* Contact Section */
.contact {
    background: var(--light-gray);
}

.contact-intro {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.error-message {
    display: block;
    color: #dc2626;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    min-height: 1rem;
}

.submit-btn {
    width: 100%;
    background: var(--primary-blue);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.submit-btn:hover:not(:disabled),
.submit-btn:focus {
    background: var(--primary-blue-hover);
    transform: translateY(-2px);
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-loading {
    display: none;
}

.submit-btn.loading .btn-text {
    display: none;
}

.submit-btn.loading .btn-loading {
    display: inline;
}

.form-messages {
    max-width: 600px;
    margin: 2rem auto 0;
}

.success-message,
.error-message {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: none;
}

.success-message {
    background: #dcfce7;
    border: 1px solid #22c55e;
    color: #166534;
}

.error-message {
    background: #fef2f2;
    border: 1px solid #dc2626;
    color: #991b1b;
}

.success-message h3,
.error-message h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background: var(--dark-gray);
    color: white;
    padding: 3rem 0 1rem;
}

/* Dark mode footer - make it darker for better contrast */
[data-theme="dark"] .footer {
    background: #0f172a;
}

/* Dark mode carousel arrows - improve contrast */
[data-theme="dark"] .carousel-btn {
    background: rgba(15, 23, 42, 0.9);
    color: white;
}

[data-theme="dark"] .carousel-btn:hover,
[data-theme="dark"] .carousel-btn:focus {
    background: #0f172a;
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: white;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.8);
    font-style: italic;
}

.footer-links h4 {
    margin-bottom: 1rem;
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition);
    color: rgba(255, 255, 255, 0.8);
}

.social-links a:hover,
.social-links a:focus {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-2px);
    outline: 2px solid white;
    outline-offset: 2px;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 120px 0 60px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .carousel {
        height: 400px;
    }
}

@media (max-width: 768px) {
    .theme-dropdown-menu {
        position: static;
        visibility: visible;
        transform: none;
        background: var(--light-gray);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
        min-width: auto;
        width: 100%;
        margin: 0.5rem 0 0 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-in-out, padding 0.3s ease-in-out;
        padding: 0;
    }
    
    .theme-dropdown-menu.show {
        max-height: 200px;
        padding: 0.5rem 0;
    }
    
    .nav-container {
        padding: 1rem;
        position: relative;
        z-index: 1000;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 6rem 2rem 2rem;
        box-shadow: none;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out, visibility 0s linear 0.3s;
        gap: 1.5rem;
        z-index: 998;
        overflow-y: auto;
        justify-content: flex-start;
        align-items: center;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out, visibility 0s linear 0s;
    }
    
    .nav-menu li {
        width: 100%;
        text-align: center;
    }
    
    .nav-link {
        display: block;
        padding: 1rem;
        font-size: 1.2rem;
        width: 100%;
    }
    
    /* Ensure theme dropdown button doesn't inherit nav-link underline styles */
    .theme-dropdown-btn:not(.nav-link) {
        position: relative;
    }
    
    .theme-dropdown-btn:not(.nav-link)::after {
        display: none !important;
    }
    
    .theme-dropdown {
        width: 100%;
    }
    
    .theme-dropdown-btn {
        width: 100%;
        justify-content: center;
        padding: 1rem;
        font-size: 1.2rem;
        position: relative;
    }
    
    .theme-dropdown-btn::after {
        display: none !important;
        content: none !important;
    }
    
    .theme-dropdown .theme-dropdown-btn::after {
        display: none !important;
    }
    
    .nav-toggle {
        display: block;
        z-index: 1001;
    }
    
    .hamburger-icon {
        display: inline-block;
    }
    
    .close-icon {
        display: none;
    }
    
    .nav-toggle.active .hamburger-icon {
        display: none;
    }
    
    .nav-toggle.active .close-icon {
        display: inline-block;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .carousel {
        height: 300px;
    }
    
    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .carousel-prev {
        left: 10px;
    }
    
    .carousel-next {
        right: 10px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .carousel {
        height: 250px;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
}

/* High contrast and reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

@media (prefers-contrast: high) {
    :root {
        --shadow: rgba(0, 0, 0, 0.5);
        --shadow-hover: rgba(0, 0, 0, 0.7);
        --border-color: #000000;
    }
}

/* Print styles */
@media print {
    .theme-controls,
    .carousel-btn,
    .carousel-nav,
    .nav-toggle {
        display: none;
    }
    
    .header {
        position: static;
        box-shadow: none;
    }
    
    .hero {
        padding: 2rem 0;
        background: white;
    }
    
    .carousel {
        height: auto;
    }
    
    .carousel-slide {
        position: static;
        opacity: 1;
    }
    
    .carousel-slide:not(:first-child) {
        display: none;
    }
}