:root {
    /* Brand Colors */
    --slate: #445461;
    --deep-navy: #171c21;
    --soft-gray: #f0f0f0;
    --charcoal: #202224;
    
    /* Accent Colors */
    --accent-primary: #445461;
    --accent-glow: rgba(68, 84, 97, 0.3);
    
    /* Typography */
    --font-primary: 'Lato', sans-serif;
    --font-display: 'Playfair Display', serif;
    
    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Dark Theme (Default) */
[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: rgba(22, 27, 34, 0.8);
    --text-primary: #f0f0f0;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border-color: rgba(68, 84, 97, 0.3);
    --gradient-hero: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #1a1f26 100%);
    --glass-bg: rgba(22, 27, 34, 0.7);
    --shadow-glow: 0 0 60px rgba(68, 84, 97, 0.15);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f0f0f0;
    --bg-card: rgba(255, 255, 255, 0.9);
    --text-primary: #171c21;
    --text-secondary: #445461;
    --text-muted: #6e7681;
    --border-color: rgba(68, 84, 97, 0.15);
    --gradient-hero: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #f0f0f0 100%);
    --glass-bg: rgba(255, 255, 255, 0.8);
    --shadow-glow: 0 0 60px rgba(68, 84, 97, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-weight: 300;
    overflow-x: hidden;
    transition: background 0.5s var(--transition-smooth), color 0.5s var(--transition-smooth);
}

/* Subtle Grid Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 80px 80px;
    opacity: 0.3;
    pointer-events: none;
    z-index: -1;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s var(--transition-smooth);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 0.02em;
}

.nav-logo span {
    color: var(--slate);
}

.nav-links {
    display: flex;
    gap: 3rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color 0.3s var(--transition-smooth);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--slate);
    transition: width 0.3s var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--text-primary);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s var(--transition-smooth);
}

.theme-toggle:hover {
    border-color: var(--slate);
    color: var(--text-primary);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }
[data-theme="light"] .theme-toggle .sun { display: none; }
[data-theme="light"] .theme-toggle .moon { display: block; }

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 4rem 4rem;
    position: relative;
    background: var(--gradient-hero);
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.2s both;
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--slate);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.4s both;
}

.hero-title .highlight {
    color: var(--slate);
    font-style: italic;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
    font-weight: 300;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.6s both;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.8s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--slate);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--deep-navy);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--slate);
    background: var(--bg-tertiary);
}

.btn svg {
    width: 16px;
    height: 16px;
}

/* Decorative Element */
.hero-visual {
    position: absolute;
    right: 4rem;
    top: 50%;
    transform: translateY(-50%);
    width: 500px;
    height: 500px;
    opacity: 0.15;
    pointer-events: none;
}

.hero-visual::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border: 1px solid var(--slate);
    border-radius: 50%;
    animation: rotate 30s linear infinite;
}

.hero-visual::after {
    content: '';
    position: absolute;
    width: 70%;
    height: 70%;
    top: 15%;
    left: 15%;
    border: 1px solid var(--slate);
    border-radius: 50%;
    animation: rotate 20s linear infinite reverse;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Section Styles */
section {
    padding: 8rem 4rem;
    position: relative;
}

.section-header {
    max-width: 600px;
    margin-bottom: 4rem;
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--slate);
    margin-bottom: 1rem;
    position: relative;
    padding-left: 3rem;
}

.section-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 2rem;
    height: 1px;
    background: var(--slate);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.section-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* About Section */
.about {
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
}

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

.stat-item {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s var(--transition-smooth);
}

.stat-item:hover {
    border-color: var(--slate);
    transform: translateY(-4px);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--slate);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.about-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image-container {
    position: relative;
    width: 400px;
    height: 500px;
}

.about-image-frame {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 1px solid var(--slate);
    top: 20px;
    left: 20px;
    z-index: 1;
}

.about-image {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    overflow: hidden;
}

.about-image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
}

.about-image-placeholder svg {
    width: 80px;
    height: 80px;
    opacity: 0.5;
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.service-card {
    padding: 2.5rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.4s var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--slate);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--transition-smooth);
}

.service-card:hover {
    border-color: var(--slate);
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

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

.service-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    color: var(--slate);
}

.service-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.service-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.service-features li::before {
    content: '';
    width: 4px;
    height: 4px;
    background: var(--slate);
    border-radius: 50%;
}

/* Projects Section */
.projects {
    background: var(--bg-secondary);
}

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

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.4s var(--transition-smooth);
}

.project-card:hover {
    border-color: var(--slate);
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.project-image {
    height: 200px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.project-image::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--slate) 0%, var(--deep-navy) 100%);
    opacity: 0.1;
}

.project-image svg {
    width: 60px;
    height: 60px;
    color: var(--slate);
    opacity: 0.5;
}

.project-content {
    padding: 1.5rem;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.project-tag {
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.25rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    color: var(--text-muted);
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--slate);
    text-decoration: none;
    transition: gap 0.3s var(--transition-smooth);
}

.project-link:hover {
    gap: 0.75rem;
}

.project-link svg {
    width: 14px;
    height: 14px;
}

/* Expertise Section */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem;
}

.expertise-column h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.expertise-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.expertise-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.expertise-item-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--slate);
}

.expertise-item-icon svg {
    width: 20px;
    height: 20px;
}

.expertise-item-content h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.expertise-item-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Process Section */
.process {
    background: var(--bg-secondary);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    position: relative;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 10%;
    right: 10%;
    height: 1px;
    background: var(--border-color);
}

.process-step {
    text-align: center;
    position: relative;
}

.process-number {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--slate);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    z-index: 2;
    transition: all 0.3s var(--transition-smooth);
}

.process-step:hover .process-number {
    background: var(--slate);
    color: #ffffff;
    border-color: var(--slate);
}

.process-step h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.process-step p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Contact Section */
.contact {
    position: relative;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-item-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--slate);
}

.contact-item-icon svg {
    width: 20px;
    height: 20px;
}

.contact-item h4 {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.contact-item p, .contact-item a {
    font-size: 1rem;
    color: var(--text-primary);
    text-decoration: none;
}

.contact-item a:hover {
    color: var(--slate);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.social-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    transition: all 0.3s var(--transition-smooth);
}

.social-link:hover {
    background: var(--slate);
    border-color: var(--slate);
    color: #ffffff;
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color 0.3s var(--transition-smooth);
}

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

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* Footer */
footer {
    padding: 3rem 4rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
}

.footer-logo span {
    color: var(--slate);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Mobile Navigation */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

/* Scroll Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--transition-smooth);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-visual {
        display: none;
    }
}

@media (max-width: 992px) {
    .nav {
        padding: 1rem 2rem;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    section {
        padding: 4rem 2rem;
    }

    .hero {
        padding: 6rem 2rem 4rem;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 3rem;
    }

    .process-steps::before {
        display: none;
    }

    .expertise-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .about-visual {
        order: -1;
    }

    .about-image-container {
        width: 300px;
        height: 400px;
    }
}

@media (max-width: 768px) {
    .services-grid,
    .projects-grid,
    .process-steps {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}