:root {
    /* Theme Colors (Light Default) */
    --color-primary: #001f3f;
    --color-accent: #2e7d32;
    --color-bg: #FFFFFF;
    --color-bg-soft: rgba(245, 245, 247, 0.8);
    --color-text: #1d1d1f;
    --color-text-dim: #86868b;
    --color-glass: rgba(255, 255, 255, 0.7);
    --color-border: rgba(0, 0, 0, 0.1);

    /* iOS Radius & Shadows */
    --radius-ios: 24px;
    --radius-s: 12px;
    --shadow-ios: 0 8px 32px 0 rgba(0, 0, 0, 0.08);
    --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.04);

    /* Typography: Hybrid Maximalist */
    --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-tech: 'JetBrains Mono', monospace;

    /* Layout & White Space (Refined for better flow) */
    --spacing-xs: 8px;
    --spacing-s: 16px;
    --spacing-m: 32px;
    --spacing-l: 48px;
    --spacing-xl: 80px;
    --max-width: 1200px;

    /* Animation Easing */
    --spring-easing: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    font-family: var(--font-ui);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    opacity: 0;
    animation: page-in 1s var(--spring-easing) forwards;
}

@keyframes page-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Utilities */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-m);
    position: relative;
}

/* Glassmorphism & Cards */
.glass-card {
    background: var(--color-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-ios);
    box-shadow: var(--shadow-ios);
    padding: var(--spacing-m);
    transition: transform 0.3s var(--spring-easing);
}

.glass-card:hover {
    transform: translateY(-4px);
}

/* Animation Reveal Classes */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--spring-easing);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Fallback: ensure content is visible if JS is slow or fails */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
    }
}

.no-js .reveal {
    opacity: 1;
    transform: none;
}

/* Grid Overlay - Removed for cleaner premium look */
.grid-overlay {
    display: none;
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-size: clamp(2rem, 7vw, 4.5rem);
    /* Reduced for elegance */
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: var(--spacing-m);
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: clamp(1rem, 1.2vw, 1.2rem);
    /* Slightly smaller */
    max-width: 550px;
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-l);
    font-weight: 450;
}

/* Buttons */
.btn {
    display: inline-flex;
    padding: 14px 32px;
    /* Slightly more compact */
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s var(--spring-easing);
    border-radius: 100px;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 31, 63, 0.2);
}

.btn-primary {
    background: var(--color-accent);
    box-shadow: 0 4px 15px rgba(46, 125, 50, 0.2);
}

.btn:hover {
    transform: scale(1.05);
    opacity: 0.95;
}

/* Human Touch Underline */
.underline-human {
    position: relative;
    display: inline-block;
}

.underline-human::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: var(--color-accent);
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 20'%3E%3Cpath d='M0 10 Q 25 20 50 10 T 100 10 T 150 10 T 200 10' stroke='black' stroke-width='4' fill='transparent'/%3E%3C/svg%3E") no-repeat center bottom;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 20'%3E%3Cpath d='M0 10 Q 25 20 50 10 T 100 10 T 150 10 T 200 10' stroke='black' stroke-width='4' fill='transparent'/%3E%3C/svg%3E") no-repeat center bottom;
    mask-size: 100% 100%;
    -webkit-mask-size: 100% 100%;
}

/* Generic Section */
.section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-l);
}

.section-header h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    /* Reduced for premium feel */
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--color-primary);
}

/* Diagram System & Card Grids */
.diagram-container,
.card-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    /* Force 4 columns on desktop */
    gap: var(--spacing-m);
}

@media (max-width: 1024px) {

    .diagram-container,
    .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {

    .diagram-container,
    .card-grid-4 {
        grid-template-columns: 1fr;
    }
}

.diagram-num {
    color: var(--color-accent);
    margin-bottom: var(--spacing-s);
    font-weight: 700;
}

.diagram-item h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-s);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-m);
}

.form-input {
    width: 100%;
    padding: 16px;
    background: #fbfbfd;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    font-family: var(--font-ui);
    font-size: 1rem;
    color: var(--color-text);
    transition: all 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: white;
    box-shadow: 0 0 0 4px rgba(46, 125, 50, 0.1);
}

.form-message {
    padding: 10px;
    border-radius: 8px;
    margin-top: 15px;
    text-align: center;
    font-size: 13px;
    font-weight: 500;
}

/* FAQ Interaction */
.faq-trigger {
    font-size: 1.1rem;
    color: var(--color-text);
    transition: color 0.2s;
}

.faq-trigger:hover {
    color: var(--color-accent);
}

.faq-answer {
    color: var(--color-text-dim);
    line-height: 1.6;
}

/* Nav Links */
.nav-link {
    text-decoration: none;
    color: var(--color-text);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Interactive Process Section */
.process-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-l);
    align-items: center;
}

.process-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-s);
}

.step-indicator {
    padding: var(--spacing-s);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s;
    border: 1px solid transparent;
}

.step-indicator.active {
    background: var(--color-glass);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-ios);
}

.step-indicator h3 {
    font-size: 1.1rem;
    margin-bottom: 4px;
    color: var(--color-primary);
}

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

.process-content {
    background: var(--color-glass);
    padding: var(--spacing-m);
    border-radius: 24px;
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

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

/* Mobile Navigation Logic */
.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    padding: 10px;
}

/* Responsive Overrides (Refined for Hub Efficiency) */
@media (max-width: 1024px) {
    .hero>.container>div {
        grid-template-columns: 1fr !important;
        text-align: center;
        gap: var(--spacing-l) !important;
    }

    .hero-subtitle {
        margin-left: auto !important;
        margin-right: auto !important;
    }

    .cta-group {
        justify-content: center;
    }

    .hero-image-container {
        max-width: 500px;
        margin: 40px auto 0;
    }

    .nav-links {
        display: none;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        padding: var(--spacing-m);
        border-bottom: 2px solid var(--color-accent);
        box-shadow: var(--shadow-ios);
        z-index: 1000;
        gap: 20px;
    }

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

@media (max-width: 768px) {
    :root {
        --spacing-xl: 60px;
        --spacing-l: 32px;
    }

    .hero-title {
        font-size: 2.1rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .glass-card {
        padding: var(--spacing-s);
    }

    #careers .glass-card {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-m);
    }

    .diagram-container,
    .card-grid-4 {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-s);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-s);
    }

    .hero-title {
        font-size: 2.2rem;
    }
}