:root {
    --obsidian: #1A1D21;
    --titanium: #8E9AA8;
    --void: #000000;
    --frost: #FFFFFF;
    --light-border: rgba(142, 154, 168, 0.2);
    --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --section-spacing: 6rem;
    --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

body {
    background-color: var(--obsidian);
    color: var(--titanium);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    margin: 0;
    min-height: 100vh;
    transition: var(--transition);
    overflow-x: hidden;
}

.background-image {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/architectural-void.svg');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    z-index: -1;
}

/* Corporate Navigation */
.corporate-nav {
    position: sticky;
    top: 0;
    width: 100%;
    left: 0;
    background: var(--obsidian);
    border-bottom: 1px solid #2a2e34;
    z-index: 1000;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

body.light-mode .corporate-nav a,
body.light-mode .corporate-nav .brand-mark {
    color: var(--obsidian);
}

body.light-mode .corporate-nav {
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid var(--light-border);
}

.nav-container {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    padding: 0.8rem 2rem;
    margin: 0;
    max-width: 1200px;
    margin: 0 auto;
}

.brand-mark {
    font-family: 'Neue Haas Grotesk', sans-serif;
    font-weight: bold;
    letter-spacing: -0.5px;
    font-size: 1.2rem;
}

.corporate-nav ul {
    display: flex;
    justify-content: center;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.corporate-nav a {
    color: var(--titanium);
    text-decoration: none;
    position: relative;
    padding-bottom: 0.3rem;
    font-size: 0.9rem;
}

.corporate-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--titanium);
    transition: width 0.3s ease;
}

.corporate-nav a:hover::after {
    width: 100%;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle-label {
    font-size: 0.8rem;
    color: var(--titanium);
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--titanium);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "☽";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: var(--obsidian);
    transition: .4s;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
}

input:checked + .slider {
    background-color: var(--obsidian);
}

input:checked + .slider:before {
    content: "☀";
    color: var(--titanium);
    background-color: var(--frost);
    transform: translateX(26px);
}

main {
    margin: 0 auto;
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 4rem;
    margin-bottom: 0;
    text-align: center;
}

h1 {
    color: var(--titanium);
    font-family: 'Neue Haas Grotesk', sans-serif;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: -0.05em;
    font-size: 4rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.tagline {
    font-weight: 400;
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

.hero-services {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.service-tag {
    background: rgba(142, 154, 168, 0.1);
    color: var(--titanium);
    padding: 0.5rem 1rem;
    border: 1px solid var(--light-border);
    font-size: 0.9rem;
    font-weight: 300;
    transition: var(--transition);
}

.service-tag:hover {
    background: rgba(142, 154, 168, 0.2);
}

/* Section Headings */
section h2 {
    font-family: 'Neue Haas Grotesk', sans-serif;
    font-weight: 300;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--titanium);
}

/* Pillars */
.pillars {
    margin: var(--section-spacing) 0;
}

.pillar {
    margin-bottom: 5rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--light-border);
    transition: var(--transition);
}

.pillar h2 {
    font-weight: 400;
    font-size: 2.2rem;
    max-width: 900px;
    margin-bottom: 1.5rem;
    transition: var(--transition);
    text-align: left;
    line-height: 1.3;
}

.reveal-on-hover {
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition);
    max-width: 600px;
}

.pillar:hover .reveal-on-hover,
.service-card:hover .reveal-on-hover,
.case-study:hover .reveal-on-hover {
    opacity: 0.8;
    transform: translateY(0);
}

/* Services Section */
.services {
    margin: var(--section-spacing) 0;
    padding: 0 2rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: rgba(142, 154, 168, 0.02);
    border: 1px solid var(--light-border);
    padding: 2rem;
    transition: var(--transition);
    cursor: pointer;
}

.service-card:hover {
    background: rgba(142, 154, 168, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--card-shadow);
}


.service-card h3 {
    font-weight: 500;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--titanium);
}

.service-description {
    font-style: italic;
    opacity: 0.8;
    margin-bottom: 1.5rem;
}

.service-card ul {
    padding-left: 1.5rem;
    margin: 0.5rem 0;
}

.service-card li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    line-height: 1.5;
}


/* Process Section */
.process {
    margin: var(--section-spacing) 0;
    padding: 0 2rem;
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.process-step {
    text-align: center;
    padding: 2rem;
    transition: var(--transition);
}

.process-step:hover {
    transform: translateY(-5px);
}

.step-number {
    font-family: 'Neue Haas Grotesk', sans-serif;
    font-size: 3rem;
    font-weight: bold;
    color: var(--titanium);
    opacity: 0.3;
    margin-bottom: 1rem;
}

.process-step h3 {
    font-weight: 500;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--titanium);
}

.process-step p {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.6;
}

/* Industries Section */
.industries {
    margin: var(--section-spacing) 0;
    padding: 0 2rem;
}

.industries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.industry-card {
    background: rgba(142, 154, 168, 0.02);
    border: 1px solid var(--light-border);
    padding: 2rem;
    transition: var(--transition);
    cursor: pointer;
}

.industry-card:hover {
    background: rgba(142, 154, 168, 0.05);
    transform: translateY(-2px);
}

.industry-card h3 {
    font-weight: 500;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--titanium);
}

.industry-card p {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.6;
}

/* Case Studies Section */
.case-studies {
    margin: var(--section-spacing) 0;
    padding: 0 2rem;
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.case-study {
    background: rgba(142, 154, 168, 0.02);
    border: 1px solid var(--light-border);
    padding: 2rem;
    transition: var(--transition);
    cursor: pointer;
}

.case-study:hover {
    background: rgba(142, 154, 168, 0.05);
    transform: translateY(-2px);
}

.case-study h3 {
    font-weight: 500;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--titanium);
}

.case-description {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.case-tags span {
    background: rgba(142, 154, 168, 0.1);
    color: var(--titanium);
    padding: 0.3rem 0.8rem;
    font-size: 0.8rem;
    border: 1px solid var(--light-border);
}

/* Contact Section */
.contact {
    padding: 5rem 2rem;
    border-top: 1px solid var(--light-border);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1.1rem;
    opacity: 0.8;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    gap: 1rem;
}

.form-group input,
.contact-form input,
.contact-form select,
.contact-form textarea {
    background: transparent;
    border: 1px solid var(--titanium);
    color: var(--titanium);
    padding: 1rem;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
}

.form-group input,
.contact-form input,
.contact-form select {
    flex: 1;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--frost);
    box-shadow: 0 0 0 2px rgba(142, 154, 168, 0.1);
}

.contact-form button {
    background: var(--titanium);
    color: var(--obsidian);
    border: none;
    padding: 1rem 2rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.contact-form button:hover {
    background: var(--frost);
}

/* Scroll Animations */
[data-scroll] {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition);
}

[data-scroll="in"] {
    opacity: 1;
    transform: translateY(0);
}

/* Light Mode */
body.light-mode {
    background-color: var(--frost);
    color: var(--obsidian);
}

body.light-mode .service-card,
body.light-mode .industry-card,
body.light-mode .case-study {
    background: rgba(26, 29, 33, 0.02);
    border-color: rgba(26, 29, 33, 0.1);
}

body.light-mode .service-card:hover,
body.light-mode .industry-card:hover,
body.light-mode .case-study:hover {
    background: rgba(26, 29, 33, 0.05);
}

body.light-mode .service-tag,
body.light-mode .case-tags span {
    background: rgba(26, 29, 33, 0.1);
    color: var(--obsidian);
    border-color: rgba(26, 29, 33, 0.2);
}

body.light-mode h1,
body.light-mode .tagline,
body.light-mode section h2,
body.light-mode .service-card h3,
body.light-mode .process-step h3,
body.light-mode .industry-card h3,
body.light-mode .case-study h3 {
    color: var(--obsidian);
}

body.light-mode .background-image {
    filter: invert(1);
}

body.light-mode .contact-form input,
body.light-mode .contact-form select,
body.light-mode .contact-form textarea {
    border-color: var(--obsidian);
    color: var(--obsidian);
}

body.light-mode .contact-form button {
    background: var(--obsidian);
    color: var(--frost);
}

body.light-mode .contact-form button:hover {
    background: var(--void);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        grid-template-columns: 1fr;
        gap: 1rem;
        text-align: center;
    }
    
    .corporate-nav ul {
        gap: 1.5rem;
    }
    
    .hero {
        padding: 0 2rem;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    .tagline {
        font-size: 1.2rem;
    }
    
    .hero-services {
        flex-direction: column;
        align-items: center;
    }
    
    .services-grid,
    .industries-grid,
    .case-studies-grid {
        grid-template-columns: 1fr;
    }
    
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-group {
        flex-direction: column;
    }
    
    section h2 {
        font-size: 2rem;
    }
    
    .pillar h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .corporate-nav ul {
        font-size: 0.8rem;
    }
    
    .service-card,
    .industry-card,
    .case-study {
        padding: 1.5rem;
    }
}