/* CSS Custom Properties */
:root {
    --primary-color: #0066cc;
    --primary-dark: #004a99;
    --primary-light: #3385d6;
    --secondary-color: #00a86b;
    --accent-color: #ff6b35;
    --text-dark: #1a1a1a;
    --text-light: #4a4a4a;
    --text-lighter: #888888;
    --bg-light: #f5f7fa;
    --bg-white: #ffffff;
    --border-color: #e1e8ed;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --gradient-primary: linear-gradient(135deg, #0066cc 0%, #004a99 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(0, 102, 204, 0.95) 0%, rgba(0, 74, 153, 0.95) 100%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.logo-img {
    height: 75px;
    width: auto;
    transition: var(--transition-fast);
}

/* Navigation */
.main-nav {
    position: relative;
}

.nav-list {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-list a {
    color: var(--text-dark);
    font-weight: 600;
    padding: 0.625rem 0.5rem;
    position: relative;
    transition: var(--transition-fast);
    border-radius: 6px;
}

.nav-list a:hover {
    color: var(--primary-color);
    background: rgba(0, 102, 204, 0.05);
}

.nav-list a.active {
    color: var(--primary-color);
}

.nav-list a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px 2px 0 0;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    transition: var(--transition);
}

/* Keywords Bar */
.keywords-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-light);
    letter-spacing: 0.02em;
}

.keywords-bar .separator {
    color: var(--text-lighter);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    color: white;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
    animation: heroShimmer 8s ease-in-out infinite;
}

@keyframes heroShimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.15);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    line-height: 1.15;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.375rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    font-weight: 400;
    line-height: 1.6;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.25rem;
    font-weight: 600;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 102, 204, 0.4);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

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

.btn-light:hover {
    background-color: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Sections */
.section-padding {
    padding: 3rem 0;
}

.bg-light {
    background-color: var(--bg-light);
}

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

.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.bg-primary .section-title {
    color: white;
}

/* Page Header */
.page-header {
    background: var(--gradient-primary);
    color: white;
    padding: 4rem 0 3rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
}

.page-title {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.page-subtitle {
    font-size: 1.25rem;
    opacity: 0.95;
    font-weight: 400;
    position: relative;
    z-index: 1;
}

/* About Section */
.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.lead-text {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 1.75rem;
    color: var(--text-dark);
    line-height: 1.6;
}

.about-content p {
    margin-bottom: 1.5rem;
    color: var(--text-light);
    font-size: 1.0625rem;
    line-height: 1.75;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.75rem;
}

.feature-card {
    background: white;
    padding: 2.25rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: 1.25rem;
    display: inline-block;
    transition: var(--transition);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
    line-height: 1.3;
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.feature-list {
    list-style: disc;
    padding-left: 1.5rem;
    color: var(--text-light);
}

.feature-list li {
    margin-bottom: 0.5rem;
}

/* Industries Section */
.industries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.25rem;
}

.industry-item {
    background: white;
    padding: 1.75rem;
    border-radius: 10px;
    text-align: center;
    font-weight: 600;
    font-size: 1.0625rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
}

.industry-item::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 10px;
    padding: 2px;
    background: var(--gradient-primary);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: var(--transition);
}

.industry-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-md);
    color: var(--primary-color);
}

.industry-item:hover::after {
    opacity: 1;
}

/* CTA Section */
.cta-section {
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: ctaPulse 6s ease-in-out infinite;
}

@keyframes ctaPulse {
    0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.5; }
    50% { transform: scale(1.1) rotate(180deg); opacity: 0.8; }
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
}

.cta-text {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.6;
}

/* Engineering Services */
.content-section {
    max-width: 900px;
    margin: 0 auto;
    font-size: 1.0625rem;
    line-height: 1.75;
}

.service-section {
    margin-bottom: 2.5rem;
}

.service-list {
    list-style: none;
    padding-left: 0;
}

.service-list li {
    padding: 0.875rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-light);
    font-size: 1.0625rem;
    line-height: 1.7;
    transition: var(--transition-fast);
}

.service-list li:hover {
    color: var(--text-dark);
    padding-left: 2.5rem;
}

.service-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.service-list li:hover::before {
    transform: scale(1.2);
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-item {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.feature-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.feature-item p {
    color: var(--text-light);
}

/* Figure Container */
.figure-container {
    text-align: center;
    margin: 2rem 0;
}

.figure-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    margin: 0 auto 1rem;
    transition: var(--transition);
}

.figure-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

.figure-caption {
    font-size: 0.875rem;
    color: var(--text-lighter);
    font-style: italic;
}

/* Case Studies */
.case-study {
    margin-bottom: 3.5rem;
}

.case-study-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 2.5rem;
    color: var(--text-dark);
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.case-study-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: start;
}

.case-study-image {
    position: relative;
}

.case-study-image::after {
    content: '';
    position: absolute;
    inset: -10px;
    background: var(--gradient-primary);
    opacity: 0;
    border-radius: 12px;
    z-index: -1;
    transition: var(--transition);
    filter: blur(20px);
}

.case-study:hover .case-study-image::after {
    opacity: 0.1;
}

.case-study-image {
    text-align: center;
}

.case-study-text {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.case-study-feature {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 10px;
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.case-study-feature:hover {
    background: white;
    border-left-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
    transform: translateX(5px);
}

.case-study-feature h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
    line-height: 1.3;
}

.case-study-feature p {
    color: var(--text-light);
    line-height: 1.75;
    font-size: 1.0625rem;
}

/* Contact Form */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: start;
}

.contact-info h2 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1.75rem;
    color: var(--text-dark);
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.contact-info a {
    color: var(--primary-color);
}

.contact-info a:hover {
    text-decoration: underline;
}

.contact-details {
    margin-top: 2rem;
}

.contact-item {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.contact-item strong {
    color: var(--text-dark);
    display: block;
    margin-bottom: 0.5rem;
}

.contact-form {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

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

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

.required {
    color: var(--accent-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
    background: white;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    background: #fafbfc;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
    transform: translateY(-1px);
}

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

.error-message {
    display: block;
    color: var(--accent-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    min-height: 1.25rem;
}

.form-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 4px;
    display: none;
}

.form-status.success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-status.error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: #cccccc;
    padding: 3.5rem 0 1.5rem;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-logo-img {
    height: 60px;
    width: auto;
    margin-bottom: 1rem;
    /* Try without filter first - many logos work naturally on dark backgrounds */
    opacity: 0.95;
    transition: var(--transition-fast);
}

/* If logo is dark and needs to be white, uncomment this instead: */
/* .footer-logo-img {
    filter: brightness(0) invert(1);
} */

/* Alternative softer approach if invert is too harsh: */
.footer-logo-img.light-version {
    filter: brightness(2) contrast(1.1);
}

.footer-logo:hover .footer-logo-img {
    transform: scale(1.05);
    opacity: 1;
}

.footer-description {
    color: #999999;
    font-size: 0.9rem;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

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

.footer-links a {
    color: #cccccc;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-contact a {
    color: var(--primary-light);
}

.footer-contact a:hover {
    text-decoration: underline;
}

.footer-keywords {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem 0;
    border-top: 1px solid #333333;
    font-size: 0.875rem;
    color: #999999;
}

.footer-keywords .separator {
    color: #666666;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid #333333;
    color: #999999;
    font-size: 0.875rem;
}