/* ==========================================================================
   OC3 Engineering Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables and Base Styles
   -------------------------------------------------------------------------- */

:root {
    /* Brand Colors */
    --color-primary: rgb(254, 53, 1);       /* OC3 Orange-Red */
    --color-secondary: rgb(255, 158, 1);     /* OC3 Orange */
    --color-accent: rgb(101, 117, 142);      /* OC3 Blue-Gray */

    /* Neutral Colors */
    --color-text: #333333;
    --color-text-light: #666666;
    --color-white: #ffffff;
    --color-bg-light: #f8f9fa;
    --color-bg-alt: #f0f2f5;
    --color-border: #e0e0e0;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Layout */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* --------------------------------------------------------------------------
   Reset and Base
   -------------------------------------------------------------------------- */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-white);
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-secondary);
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-sm);
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }

p {
    margin: 0 0 var(--spacing-sm);
}

ul, ol {
    margin: 0 0 var(--spacing-sm);
    padding-left: var(--spacing-md);
}

li {
    margin-bottom: var(--spacing-xs);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.hidden {
    display: none !important;
}

/* --------------------------------------------------------------------------
   Header and Navigation
   -------------------------------------------------------------------------- */

.site-header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo img {
    height: 50px;
    width: auto;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-md);
}

.main-nav a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Mobile Navigation Toggle */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    flex-direction: column;
    gap: 4px;
}

.mobile-nav-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--color-text);
    transition: all 0.3s ease;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #e04a00;
    color: var(--color-white);
}

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

.btn-secondary:hover {
    background-color: #7a8a9e;
    color: var(--color-white);
}

.link-arrow {
    font-weight: 500;
}

.link-arrow::after {
    content: " →";
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */

.hero {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.hero h1 {
    font-size: 2rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

/* --------------------------------------------------------------------------
   Page Header
   -------------------------------------------------------------------------- */

.page-header {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl) 0;
}

.page-header h1 {
    margin-bottom: var(--spacing-xs);
}

.page-intro {
    color: var(--color-text-light);
    font-size: 1.125rem;
}

/* --------------------------------------------------------------------------
   Content Sections
   -------------------------------------------------------------------------- */

section {
    padding: var(--spacing-xl) 0;
}

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

.intro h2 {
    margin-bottom: var(--spacing-md);
}

.intro p {
    max-width: 800px;
}

.intro-centered {
    text-align: center;
}

.intro-centered p {
    margin-left: auto;
    margin-right: auto;
}

/* --------------------------------------------------------------------------
   Services Summary (Home Page)
   -------------------------------------------------------------------------- */

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.service-card {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 4px;
    border: 1px solid var(--color-border);
}

.service-card h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.service-card p {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.services-cta {
    text-align: center;
}

/* --------------------------------------------------------------------------
   Why OC3 Section
   -------------------------------------------------------------------------- */

.why-oc3 {
    background-color: var(--color-white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 900px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .benefits-grid {
        grid-template-columns: 1fr;
    }
}

.benefit h3 {
    color: var(--color-primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.benefit p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin: 0;
}

/* --------------------------------------------------------------------------
   Featured Projects (Home Page)
   -------------------------------------------------------------------------- */

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

.projects-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.project-preview {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 4px;
    border-left: 3px solid var(--color-secondary);
}

.project-preview h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.project-preview p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin: 0;
}

.projects-cta {
    text-align: center;
}

/* --------------------------------------------------------------------------
   CTA Section
   -------------------------------------------------------------------------- */

.cta-section {
    background-color: var(--color-accent);
    color: var(--color-white);
    text-align: center;
}

.cta-section h2 {
    color: var(--color-white);
}

.cta-section p {
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */

.about-intro,
.principal,
.professional {
    background-color: var(--color-white);
}

.principal-bio p {
    max-width: 800px;
}

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

.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 900px) {
    .principles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .principles-grid {
        grid-template-columns: 1fr;
    }
}

.principle {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 4px;
}

.principle h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.principle p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin: 0;
}

.project-types {
    background-color: var(--color-white);
}

.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.type-card {
    border-left: 3px solid var(--color-secondary);
    padding-left: var(--spacing-sm);
}

.type-card h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.type-card p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin: 0;
}

/* --------------------------------------------------------------------------
   Services Page
   -------------------------------------------------------------------------- */

.service-detail {
    background-color: var(--color-white);
}

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

.service-detail h2 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.service-description h3 {
    font-size: 1rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.service-description ul {
    color: var(--color-text-light);
}

.service-description > p:first-child {
    font-size: 1.0625rem;
}

/* --------------------------------------------------------------------------
   Projects Page
   -------------------------------------------------------------------------- */

.projects-grid-section {
    background-color: var(--color-white);
}

.projects-full-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.project-info {
    padding: var(--spacing-md);
}

.project-card h2 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.project-location {
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.project-type {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.project-scope h3,
.project-outcome h3,
.project-status h3 {
    font-size: 0.875rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.project-scope p,
.project-outcome p,
.project-status p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin: 0;
}

.projects-disclaimer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-align: center;
    font-style: italic;
}

/* --------------------------------------------------------------------------
   Contact Page
   -------------------------------------------------------------------------- */

.contact-section {
    background-color: var(--color-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
}

.contact-info h2,
.contact-form-wrapper h2 {
    margin-bottom: var(--spacing-md);
}

.contact-method {
    margin-bottom: var(--spacing-md);
}

.contact-method h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.contact-method p {
    margin: 0;
}

/* Contact Form */
.contact-form {
    max-width: 500px;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
    background-color: var(--color-text);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.footer-content p {
    margin: 0 0 var(--spacing-xs);
    font-size: 0.9375rem;
}

.site-footer a {
    color: var(--color-secondary);
}

.site-footer a:hover {
    color: var(--color-white);
}

.footer-legal {
    opacity: 0.8;
    font-size: 0.875rem;
}

/* --------------------------------------------------------------------------
   Thank You Page
   -------------------------------------------------------------------------- */

.thank-you-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.thank-you-content {
    max-width: 600px;
    margin: 0 auto;
}

.thank-you-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
    /* Typography */
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }

    .hero h1 {
        font-size: 1.5rem;
    }

    /* Navigation */
    .mobile-nav-toggle {
        display: flex;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-sm);
    }

    .main-nav.nav-open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }

    .main-nav li {
        margin: 0;
    }

    .main-nav a {
        display: block;
        padding: var(--spacing-sm);
        border-bottom: none;
    }

    /* Mobile menu animation */
    .mobile-nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    /* Contact Grid */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* Projects Grid */
    .projects-full-grid {
        grid-template-columns: 1fr;
    }

    /* Spacing */
    section {
        padding: var(--spacing-lg) 0;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }

    .services-grid,
    .benefits-grid,
    .principles-grid,
    .types-grid {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */

/* Focus styles */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip link (can add to HTML if desired) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 8px;
    z-index: 100;
}

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

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

    html {
        scroll-behavior: auto;
    }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */

@media print {
    .site-header,
    .site-footer,
    .cta-section,
    .mobile-nav-toggle {
        display: none;
    }

    body {
        font-size: 12pt;
        color: #000;
    }

    a {
        color: #000;
        text-decoration: underline;
    }
}