/**
 * Cee Vee Engineering Ltd - Main Stylesheet
 * Modern, responsive design with Bootstrap 5
 * Brand Colours: Navy Blue (#0a4f84), White, Light Grey
 */

/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
    /* Brand Colours */
    --cv-navy: #0a4f84;
    --cv-navy-dark: #083d66;
    --cv-navy-light: #0d6ebd;
    --cv-white: #ffffff;
    --cv-light-grey: #f8f9fa;
    --cv-dark-grey: #212529;
    --cv-text-muted: #6c757d;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif;
    
    /* Spacing */
    --section-padding: 6rem;
    --section-padding-mobile: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    
    /* Shadows */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}

/* ============================================
   Base Styles
   ============================================ */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 76px;
}

body {
    font-family: var(--font-primary);
    letter-spacing: -0.01em;
    line-height: 1.6;
    color: var(--cv-dark-grey);
    font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

a {
    color: var(--cv-navy);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover, a:focus {
    color: var(--cv-navy-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    padding: 0.75rem 0;
    background-color: var(--cv-white);
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    padding: 0;
}

.navbar-brand img {
    height: 50px;
    width: auto;
}

.navbar-nav .nav-link {
    color: var(--cv-dark-grey);
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    text-transform: none;
    letter-spacing: 0;
    padding: 1rem 1.25rem;
    position: relative;
    transition: color var(--transition-fast);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link:focus {
    color: var(--cv-navy);
}

.navbar-nav .nav-link.active {
    color: var(--cv-navy);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0.5rem;
    left: 1.25rem;
    right: 1.25rem;
    height: 3px;
    background-color: var(--cv-navy);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    transform: scaleX(1);
}

.navbar-toggler {
    border: 2px solid var(--cv-navy);
    padding: 0.5rem 0.75rem;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2810, 79, 132, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Mobile Navigation */
@media (max-width: 991.98px) {
    .navbar-nav .nav-link {
        padding: 0.75rem 1rem;
    }
    
    .navbar-nav .nav-link::after {
        display: none;
    }
    
    .navbar-collapse {
        background-color: var(--cv-white);
        padding: 1rem;
        margin-top: 0.5rem;
        border-radius: 0.5rem;
        box-shadow: var(--shadow-md);
    }
}

/* ============================================
   Hero Section - Split Layout
   ============================================ */
.hero-split {
    margin-top: 76px;
}

.hero-split .row {
    margin: 0;
}

.hero-split-content {
    background: linear-gradient(135deg, var(--cv-navy) 0%, var(--cv-navy-dark) 100%);
    padding: 3rem 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-split-inner {
    max-width: 480px;
    color: var(--cv-white);
}

.hero-split h1 {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
    line-height: 1.15;
}

.hero-split .lead {
    font-size: clamp(0.85rem, 1.5vw, 1.1rem);
    opacity: 0.95;
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.95);
}

.hero-split-content .btn {
    font-weight: 600;
}

.hero-split-content .btn-primary {
    background-color: var(--cv-white);
    color: var(--cv-navy);
    border-color: var(--cv-white);
}

.hero-split-content .btn-primary:hover {
    background-color: var(--cv-light-grey);
    border-color: var(--cv-light-grey);
}

.hero-split-content .btn-outline-primary {
    color: var(--cv-white);
    border-color: var(--cv-white);
}

.hero-split-content .btn-outline-primary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--cv-white);
}

.hero-split-image {
    display: none;
    padding: 0;
}

.hero-split-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

@media (min-width: 992px) {
    .hero-split .row {
        min-height: 400px;
    }
    
    .hero-split-content {
        padding: 3rem;
        background: linear-gradient(135deg, var(--cv-navy) 0%, var(--cv-navy-dark) 100%);
    }
    
    .hero-split-image {
        display: block;
        min-height: 400px;
    }
}

@media (max-width: 991.98px) {
    .hero-split-content {
        padding: 3rem 1.5rem;
        background: linear-gradient(rgba(10, 79, 132, 0.85), rgba(7, 54, 91, 0.9)), url('../img/nuclear-big.jpg');
        background-size: cover;
        background-position: center;
        min-height: 400px;
    }
    
    .hero-split-inner {
        max-width: 100%;
        text-align: center;
    }
    
    .hero-split-inner .d-flex {
        justify-content: center;
    }
}

.hero-split-content .certification-badge {
    width: 60px;
    height: auto;
    margin-top: 0.5rem;
    opacity: 0.95;
}
/* Page Hero (smaller for inner pages) */
.page-hero {
    position: relative;
    padding: 8rem 1rem 4rem;
    text-align: center;
    color: var(--cv-white);
    background: linear-gradient(
        135deg,
        var(--cv-navy) 0%,
        var(--cv-navy-dark) 100%
    );
}

.page-hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.page-hero .lead {
    font-size: 1.125rem;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    font-family: var(--font-heading);
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    padding: 0.875rem 2rem;
    border-radius: 0.375rem;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--cv-navy);
    border-color: var(--cv-navy);
}

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

.btn-outline-primary {
    color: var(--cv-navy);
    border-color: var(--cv-navy);
    border-width: 2px;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
    background-color: var(--cv-navy);
    border-color: var(--cv-navy);
    transform: translateY(-2px);
}

.btn-light {
    background-color: var(--cv-white);
    color: var(--cv-navy);
}

.btn-light:hover,
.btn-light:focus {
    background-color: var(--cv-light-grey);
    color: var(--cv-navy-dark);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1rem;
}

/* ============================================
   Section Styles
   ============================================ */
section {
    padding: var(--section-padding) 0;
}

@media (max-width: 767.98px) {
    section {
        padding: var(--section-padding-mobile) 0;
    }
}

.section-heading {
    text-align: center;
    margin-bottom: 4rem;
}

.section-heading h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--cv-navy);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-heading h2::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--cv-navy);
    border-radius: 2px;
}

.section-heading p {
    color: var(--cv-text-muted);
    max-width: 700px;
    margin: 1.5rem auto 0;
}

.bg-light {
    background-color: var(--cv-light-grey) !important;
}

.bg-navy {
    background-color: var(--cv-navy) !important;
    color: var(--cv-white);
}

.bg-navy h2,
.bg-navy h3,
.bg-navy h4 {
    color: var(--cv-white);
}

.bg-navy .section-heading h2::after {
    background-color: var(--cv-white);
}

.bg-navy .section-heading p {
    color: rgba(255, 255, 255, 0.85);
}

/* ============================================
   Cards
   ============================================ */
.card {
    border: none;
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    height: 100%;
}

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

.card-img-top {
    height: 220px;
    object-fit: cover;
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--cv-navy);
    margin-bottom: 0.75rem;
}

.card-text {
    color: var(--cv-text-muted);
    font-size: 0.95rem;
}

/* Feature Cards */
.feature-card {
    text-align: center;
    padding: 2.5rem 2rem;
}

.feature-card .icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--cv-navy) 0%, var(--cv-navy-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    color: var(--cv-white);
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
    font-weight: 600;
}

.bg-navy .feature-card {
    background-color: rgba(255, 255, 255, 0.95);
    border: none;
}

.bg-navy .feature-card h3 {
    color: var(--cv-navy);
}

.bg-navy .feature-card p {
    color: var(--cv-text-muted);
}

/* Product Cards */
.product-card .card-img-wrapper {
    position: relative;
    overflow: hidden;
}

.product-card .card-img-top {
    transition: transform var(--transition-normal);
}

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

/* ============================================
   Content Sections with Images
   ============================================ */
.content-section {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
}

.content-section .content-image {
    flex: 1 1 50%;
    min-height: 400px;
    background-size: cover;
    background-position: center;
}

.content-section .content-text {
    flex: 1 1 50%;
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

@media (max-width: 991.98px) {
    .content-section .content-image,
    .content-section .content-text {
        flex: 1 1 100%;
    }
    
    .content-section .content-image {
        min-height: 300px;
    }
    
    .content-section .content-text {
        padding: 2rem 1.5rem;
    }
}

.content-section.reverse {
    flex-direction: row-reverse;
}

/* ============================================
   Product Grid
   ============================================ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.product-item {
    background: var(--cv-white);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.product-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.product-item .product-info {
    padding: 1.25rem;
}

.product-item h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--cv-dark-grey);
}

.product-item p {
    font-size: 0.875rem;
    color: var(--cv-text-muted);
    margin-bottom: 0;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-card {
    text-align: center;
    padding: 2rem;
    height: 100%;
}

.contact-card .icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--cv-navy);
    color: var(--cv-white);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 1.5rem;
}

.contact-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: 1rem;
    color: var(--cv-dark-grey);
}

.contact-card p {
    color: var(--cv-text-muted);
    font-size: 0.95rem;
}

.contact-card a {
    color: var(--cv-navy);
    font-size: 0.95rem;
    text-decoration: underline;
    text-decoration-color: transparent;
    transition: text-decoration-color var(--transition-fast);
}

.contact-card a:hover,
.contact-card a:focus {
    color: var(--cv-navy-dark);
    text-decoration-color: currentColor;
}

/* Map */
.map-container {
    width: 100%;
    height: 400px;
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.map-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ============================================
   Clients Section
   ============================================ */
.clients-grid {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 3rem;
}

.client-logo {
    max-height: 80px;
    max-width: 150px;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all var(--transition-fast);
}

.client-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: linear-gradient(
        135deg,
        var(--cv-navy) 0%,
        var(--cv-navy-dark) 100%
    );
    color: var(--cv-white);
    text-align: center;
    padding: 5rem 1rem;
}

.cta-section h2 {
    color: var(--cv-white);
    margin-bottom: 1.5rem;
}

.cta-section p {
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--cv-dark-grey);
    color: rgba(255, 255, 255, 0.85);
    padding: 4rem 0 2rem;
}

.footer h5 {
    color: var(--cv-white);
    font-size: 1rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: 1.5rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.85);
}

.footer a:hover,
.footer a:focus {
    color: var(--cv-white);
    text-decoration: underline;
}

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

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 3rem;
    padding-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
}

.footer-logo {
    height: auto;
    width: 100%;
    max-width: 160px;
    margin-bottom: 1rem;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--cv-navy);
    color: var(--cv-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--cv-navy-dark);
    transform: translateY(-3px);
}

/* ============================================
   Utilities
   ============================================ */
.text-navy {
    color: var(--cv-navy) !important;
}

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

.border-navy {
    border-color: var(--cv-navy) !important;
}

.fw-semibold {
    font-weight: 600;
}

/* Lazy Loading Images */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity var(--transition-normal);
}

img[loading="lazy"].loaded,
img[loading="lazy"]:not([src=""]) {
    opacity: 1;
}

/* Skip to Main Content (Accessibility) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--cv-navy);
    color: var(--cv-white);
    padding: 8px 16px;
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* Focus Styles (Accessibility) */
*:focus-visible {
    outline: 3px solid var(--cv-navy-light);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .back-to-top,
    .cta-section {
        display: none !important;
    }
    
    .hero,
    .page-hero {
        min-height: auto;
        padding: 2rem;
        background: var(--cv-navy) !important;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
}