/* Apple Design System Variables */
:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-link: #0066cc;
    --color-nav-bg: rgba(255, 255, 255, 0.8);
    --color-footer-bg: #f5f5f7;
    --color-accent: #0071e3;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
    
    /* Layout */
    --max-width: 1200px;
    --nav-height: 62px;
}

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.7;
}

ul {
    list-style: none;
}

/* Common Layout Components */
.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

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

/* Navigation Bar (Apple Style) */
.global-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--color-nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 9999;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.nav-content {
    max-width: 1024px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-md);
}

.nav-logo {
    display: flex;
    align-items: center;
    font-weight: 600;
    font-size: 1.54rem;
    color: var(--color-text);
}

.nav-logo img {
    height: 34px;
    margin-right: 11px;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 1.12rem;
    color: var(--color-text);
    opacity: 0.8;
    transition: opacity 0.2s;
}

.nav-links a:hover {
    opacity: 1;
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* Hide for now, can implement mobile menu if needed */
    }
    
    .section-container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

/* Footer (Apple Style) */
.global-footer {
    background: var(--color-footer-bg);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.footer-content {
    max-width: 980px;
    margin: 0 auto;
}

.footer-top {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}