/* CSS Variables - Bariton AI Corporate Identity */
:root {
    /* Colors */
    --carbon-black: #0A0A0A;
    --pure-white: #FFFFFF;
    --off-white: #F5F5FA;
    --electric-cyan: #00E5FF;
    --engineering-blue: #0F223D;
    
    /* Derived colors */
    --text-primary: var(--carbon-black);
    --text-secondary: #4A4A4A;
    --text-muted: #6B7280;
    --bg-primary: var(--pure-white);
    --bg-secondary: var(--off-white);
    --border-color: #E5E7EB;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --container-max: 1200px;
    --section-padding: 120px;
    --section-padding-mobile: 80px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
}

.btn-primary {
    background-color: var(--electric-cyan);
    color: var(--carbon-black);
}

.btn-primary:hover {
    background-color: #00D4EB;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 229, 255, 0.3);
}

.btn-primary:disabled {
    background-color: #9CA3AF;
    color: var(--pure-white);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--carbon-black);
    background-color: var(--carbon-black);
    color: var(--pure-white);
}

.btn-full {
    width: 100%;
}

/* Section Headers */
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--electric-cyan);
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-text {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-sub {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    background-color: var(--electric-cyan);
    color: var(--carbon-black) !important;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 500;
}

.nav-cta:hover {
    background-color: #00D4EB;
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    background-color: var(--off-white);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
}

.hero-title {
    font-size: 64px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 40px;
    max-width: 560px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Services Section */
.services {
    padding: var(--section-padding) 0;
    background-color: var(--bg-primary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.service-card {
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all var(--transition-normal);
    background-color: var(--bg-primary);
}

.service-card:hover {
    border-color: var(--electric-cyan);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.service-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--off-white);
    border-radius: 10px;
    margin-bottom: 24px;
    color: var(--electric-cyan);
}

.service-icon svg {
    width: 24px;
    height: 24px;
}

.service-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.service-description {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-features li {
    font-size: 14px;
    color: var(--text-muted);
    padding-left: 16px;
    position: relative;
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background-color: var(--electric-cyan);
    border-radius: 50%;
}

/* About Section */
.about {
    padding: var(--section-padding) 0;
    background-color: var(--off-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-text {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.about-values {
    display: flex;
    gap: 40px;
    margin-top: 40px;
}

.value-item {
    display: flex;
    flex-direction: column;
}

.value-number {
    font-size: 32px;
    font-weight: 600;
    color: var(--electric-cyan);
    line-height: 1;
}

.value-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.about-culture {
    display: flex;
    justify-content: center;
}

.culture-card {
    background-color: var(--bg-primary);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    max-width: 400px;
}

.culture-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.culture-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.culture-traits {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.trait {
    font-size: 12px;
    font-weight: 500;
    padding: 6px 12px;
    background-color: var(--off-white);
    border-radius: 20px;
    color: var(--text-secondary);
}

/* Why Bariton Section */
.why-us {
    padding: var(--section-padding) 0;
    background-color: var(--bg-primary);
}

.why-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    margin-bottom: 64px;
}

.why-subtitle {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.problem-list,
.solution-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.problem-list li,
.solution-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 16px;
    color: var(--text-secondary);
}

.problem-x {
    color: #EF4444;
    font-weight: 600;
    flex-shrink: 0;
}

.solution-check {
    color: var(--electric-cyan);
    font-weight: 600;
    flex-shrink: 0;
}

.differentiators {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.diff-card {
    padding: 28px;
    background-color: var(--off-white);
    border-radius: 10px;
    text-align: center;
}

.diff-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.diff-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Contact Section */
.contact {
    padding: var(--section-padding) 0;
    background-color: var(--off-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-info .section-title {
    text-align: left;
    margin-bottom: 20px;
}

.contact-text {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.contact-value {
    font-size: 16px;
    color: var(--text-primary);
    font-weight: 500;
}

.contact-value:hover {
    color: var(--electric-cyan);
}

.contact-form-wrapper {
    background-color: var(--bg-primary);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color var(--transition-fast);
    background-color: var(--bg-primary);
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #9CA3AF;
}

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

/* Footer */
.footer {
    padding: 60px 0 30px;
    background-color: var(--carbon-black);
    color: var(--pure-white);
}

.footer-content {
    text-align: center;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 16px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.footer-sub {
    font-size: 12px;
    color: #6B7280;
    letter-spacing: 0.05em;
}

.footer-text {
    font-size: 16px;
    color: #9CA3AF;
    font-style: italic;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #1F2937;
}

.footer-bottom p {
    font-size: 14px;
    color: #6B7280;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 52px;
    }
    
    .about-grid,
    .contact-grid {
        gap: 48px;
    }
    
    .differentiators {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: var(--section-padding-mobile);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        font-size: 18px;
        padding: 8px 0;
    }
    
    .nav-cta {
        width: 100%;
        text-align: center;
        margin-top: 8px;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-accent {
        width: 300px;
        height: 300px;
        opacity: 0.5;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .service-card {
        padding: 32px;
    }
    
    .about-grid,
    .contact-grid,
    .why-grid {
        grid-template-columns: 1fr;
    }
    
    .about-values {
        gap: 24px;
    }
    
    .differentiators {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        padding: 28px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .service-card {
        padding: 24px;
    }
    
    .culture-card {
        padding: 28px;
    }
}

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

.service-card,
.diff-card,
.culture-card {
    animation: fadeInUp 0.6s ease forwards;
}

/* 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;
    }
}