/* 
  Apple Design System Inspired Variables 
  Extracted from DESIGN-a.md 
*/
:root {
    /* Colors */
    --primary: #0066cc;
    --ink: #1d1d1f;
    --body-on-dark: #ffffff;
    --ink-muted-80: #333333;
    --ink-muted-48: #7a7a7a;
    --hairline: #e0e0e0;
    --canvas: #ffffff;
    --canvas-parchment: #f5f5f7;
    --surface-tile-1: #272729;
    --surface-black: #000000;
    
    /* Typography */
    --font-family: 'Pretendard', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 17px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-section: 80px;

    /* Radii */
    --rounded-lg: 18px;
}

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

body {
    font-family: var(--font-family);
    color: var(--ink);
    background-color: var(--canvas);
    -webkit-font-smoothing: antialiased;
    line-height: 1.47;
    font-size: 17px;
    letter-spacing: -0.374px;
}

/* Typography Classes */
.display-title {
    font-size: 56px;
    font-weight: 600;
    line-height: 1.07;
    letter-spacing: -0.28px;
    margin-bottom: var(--spacing-sm);
}

.display-lg {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.01em; /* Apple tight emulation */
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: 34px;
    font-weight: 600;
    line-height: 1.47;
    letter-spacing: -0.374px;
    margin-bottom: var(--spacing-xxl);
    text-align: center;
}

.tagline {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.231px;
}

.lead-airy {
    font-size: 24px;
    font-weight: 300;
    line-height: 1.5;
    letter-spacing: 0;
    max-width: 800px;
    margin: 0 auto;
}

/* Layout Utilities */
.section {
    padding: var(--spacing-section) 0;
    overflow: hidden;
    scroll-margin-top: 100px;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

/* Surface Modes */
.dark-tile {
    background-color: var(--surface-black);
    color: var(--body-on-dark);
}

.light-tile {
    background-color: var(--canvas);
    color: var(--ink);
}

.parchment-tile {
    background-color: var(--canvas-parchment);
    color: var(--ink);
}

/* Global Nav Header (Floating Pill) */
.global-nav {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 900px;
    height: 64px;
    background: linear-gradient(90deg, rgba(15, 10, 60, 0.85) 0%, rgba(20, 50, 200, 0.85) 50%, rgba(15, 10, 60, 0.85) 100%);
    border-radius: 32px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    z-index: 1000;
}

.nav-container {
    width: 100%;
    padding: 0 32px;
    display: flex;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--body-on-dark);
    gap: 8px;
}

.brand-logo {
    height: 24px;
    width: auto;
}

.brand-text {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.12px;
}

.nav-links {
    margin-left: auto;
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: rgba(255, 255, 255, 1);
}

/* Hero Section */
.hero {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding-top: 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin-top: 100px;
}

.hero-image-container {
    margin-top: auto;
    width: 100%;
    max-width: 1000px;
    display: flex;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.hero-image {
    width: 60%; /* Reduced size by 40% */
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: contain;
    /* Apple's single signature product shadow */
    filter: drop-shadow(3px 5px 30px rgba(255, 255, 255, 0.1));
}

/* About Section */
.about {
    text-align: center;
    padding: 80px 0;
}

.about-image-container {
    margin-top: 60px;
    display: flex;
    justify-content: center;
}

.about-image {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: 8px;
    filter: grayscale(80%);
    opacity: 0.9;
    /* Soft shadow on white/parchment surfaces */
    box-shadow: 3px 5px 30px 0 rgba(0, 0, 0, 0.22);
}

/* Products Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.utility-card {
    background-color: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.card-image {
    width: 100%;
    aspect-ratio: 1;
    background-color: var(--canvas-parchment);
    border-radius: 8px;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
}

.card-desc {
    font-size: 14px;
    color: var(--ink-muted-80);
}

/* Portfolio Tiles */
.portfolio-tile {
    padding: var(--spacing-section);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.portfolio-image {
    width: 100%;
    max-width: 1000px;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    margin-top: 40px;
    border-radius: 8px;
    /* Soft shadow on white/parchment surfaces */
    box-shadow: 3px 5px 30px 0 rgba(0, 0, 0, 0.22);
}

/* Workflow */
.workflow-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 60px;
    text-align: left;
}

.workflow-item h3 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--hairline);
    padding-bottom: 8px;
}

.workflow-item ul {
    list-style: none;
}

.workflow-item li, .workflow-item p {
    font-size: 17px;
    margin-bottom: 8px;
    color: var(--ink-muted-80);
}

/* Footer */
.footer {
    padding: 64px var(--spacing-lg) 40px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-heading {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}

.dense-link {
    font-size: 17px;
    font-weight: 400;
    line-height: 2.41;
    color: var(--ink-muted-80);
}

.fine-print {
    font-size: 12px;
    color: var(--ink-muted-80);
    line-height: 1.5;
}

.footer-legal {
    border-top: 1px solid var(--hairline);
    padding-top: 20px;
}

.micro-legal {
    font-size: 10px;
    color: var(--ink-muted-48);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.hamburger {
    display: none;
    cursor: pointer;
    margin-left: auto;
    padding: 4px;
}

.mobile-br {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .hamburger { display: block; }
    
    .mobile-br { display: block; }
    .desktop-only { display: none; }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        right: 0;
        background: rgba(15, 10, 60, 0.95);
        backdrop-filter: blur(12px);
        padding: 20px;
        border-radius: 16px;
        flex-direction: column;
        min-width: 160px;
        text-align: right;
        border: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }
    .nav-links.active { display: flex; }
    
    .display-title { font-size: 36px; }
    .display-xl { font-size: 44px !important; }
    .display-lg { font-size: 28px !important; }
    .section-title { font-size: 28px; margin-bottom: 32px; }
    
    .section { padding: 50px 0; }
    .container { padding: 0 16px; }
    
    .hero { padding-top: 100px; min-height: auto; padding-bottom: 10px; }
    #products { padding-top: 20px; }
    .hero-content { margin-top: 40px; }
    .hero-subtitle { font-size: 16px; padding: 0 20px; }
    .hero-image-container { margin-top: 4px; }
    .hero-image { width: 95%; margin-top: 0; }
    
    .global-nav { width: 95%; height: 56px; top: 12px; }
    .nav-container { padding: 0 16px; }
    .nav-links a { font-size: 15px; }
    .brand-text { font-size: 15px; }
    
    .lead-airy { font-size: 17px !important; margin-bottom: 16px !important; }
    
    .workflow-grid { grid-template-columns: 1fr; gap: 24px; margin-top: 32px; }
    .workflow-step { margin-bottom: 32px; }
    
    .about-image-container { margin-top: 32px; width: 100% !important; max-width: 100% !important; aspect-ratio: 1 / 1 !important; }
    
    .footer { padding-top: 40px; padding-bottom: 30px; }
    .footer > .container > div { flex-direction: column !important; gap: 32px !important; align-items: flex-start !important; text-align: left !important; }
    .footer > .container > div > div { text-align: left !important; }
    
    #about div[style*="font-size: 26px"] {
        font-size: 20px !important;
        gap: 12px !important;
        flex-wrap: wrap;
    }
    
    #portfolio-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px !important;
        margin-top: 32px !important;
    }
    #portfolio-grid > div {
        padding: 12px !important;
        border-radius: 12px !important;
    }
    #portfolio-grid h4 {
        font-size: 14px !important;
        margin-bottom: 6px !important;
    }
    #portfolio-grid p {
        font-size: 11px !important;
        line-height: 1.4 !important;
    }
}