/* ETERNAL DESIGN SYSTEM - FOUNDATIONS */
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600&display=swap');

:root {
    /* Main Font */
    --font-family-primary: 'Be Vietnam Pro', sans-serif;
    --font-size-base: 16px;
    --font-weight-base: 300;
    --font-lineheight-base: 24px;
    
    /* Typography Scale */
    --font-size-xs: 12px;
    --font-size-sm: 16px;
    --font-size-md: 18px;
    --font-size-lg: 20px;
    --font-size-xl: 40px;

    /* Color Palette */
    --color-text-primary: #414a5d;
    --color-text-tertiary: #0a0a0a;
    --color-text-inverse: #ffffff;
    --color-surface-base: #000000;
    --color-surface-light: #ffffff;
    --color-surface-muted: #f9fafb;
    --color-border-default: #e5e7eb;
    --color-border-muted: #e6e9ef;

    /* Spacing Scale */
    --space-1: 8px;
    --space-2: 11px;
    --space-3: 16px;
    --space-4: 26px;
    --space-5: 28px;
    --space-6: 48px;
    --space-7: 64px;

    /* Motion */
    --motion-duration-instant: 300ms;
}

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

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-base);
    line-height: var(--font-lineheight-base);
    color: var(--color-text-primary);
    background-color: var(--color-surface-light);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--motion-duration-instant) ease;
}

a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 2px solid var(--color-text-tertiary);
    outline-offset: 4px;
}

/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-tertiary);
    font-weight: 500;
    line-height: 1.2;
}

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-md { font-size: var(--font-size-md); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

/* LAYOUT */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.section {
    padding: var(--space-7) 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-7 { gap: var(--space-7); }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

/* HEADER */
.header {
    background-color: var(--color-surface-light);
    border-bottom: 1px solid var(--color-border-muted);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-list {
    display: flex;
    gap: var(--space-5);
    list-style: none;
}

.nav-item {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    font-weight: 400;
    position: relative;
}

.nav-item:hover {
    color: var(--color-text-tertiary);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--motion-duration-instant) ease;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--color-surface-base);
    color: var(--color-text-inverse);
}

.btn-primary:hover {
    background-color: #333333;
}

.btn-primary:active {
    background-color: #1a1a1a;
}

.btn-primary:disabled {
    background-color: #e5e5e5;
    color: #a3a3a3;
    cursor: not-allowed;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text-tertiary);
    border: 1px solid var(--color-border-default);
}

.btn-outline:hover {
    border-color: var(--color-text-tertiary);
    background-color: var(--color-surface-muted);
}

/* HEADER & LOGO styling matching eternal.com */
.header-logo {
    font-size: 28px;
    font-weight: 700;
    color: #000000;
    letter-spacing: -0.05em;
    font-family: var(--font-family-primary);
}

/* HERO SECTION WITH GRID BACKGROUND */
.hero {
    position: relative;
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    background-color: var(--color-surface-light);
    border-bottom: 1px solid var(--color-border-muted);
    padding: var(--space-7) 0;
    overflow: hidden;
}

.hero-grid-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: 50px 50px;
    background-image: 
        linear-gradient(to right, rgba(230, 233, 239, 0.6) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(230, 233, 239, 0.6) 1px, transparent 1px);
    background-position: center center;
    z-index: 1;
}

.hero-radial-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle 450px at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.05) 25%, rgba(255, 255, 255, 0.95) 80%, #ffffff 100%);
    z-index: 2;
    pointer-events: none;
    transition: background 0.05s ease;
}

.hero .container {
    position: relative;
    z-index: 3;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: calc(100vh - 180px);
}

.hero-content {
    max-width: 1000px;
    margin-top: auto;
    margin-bottom: auto;
}

.hero h1 {
    font-size: 80px;
    font-weight: 300;
    line-height: 1.15;
    margin-bottom: var(--space-4);
    color: var(--color-text-tertiary);
    letter-spacing: -0.03em;
}

/* Founder note container */
.founder-note {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    align-self: flex-end;
    margin-top: var(--space-5);
    background: rgba(255, 255, 255, 0.8);
    padding: var(--space-2);
    border-radius: 4px;
}

.founder-img {
    width: 60px;
    height: 80px;
    object-fit: cover;
    border-radius: 2px;
}

.founder-info {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    line-height: 1.4;
}

.founder-info span {
    display: block;
}

.founder-info .founder-name {
    font-weight: 500;
    color: var(--color-text-tertiary);
}

.founder-info a {
    color: var(--color-text-tertiary);
    text-decoration: underline;
    font-weight: 500;
}

/* Scroll down indicator */
.scroll-down {
    align-self: flex-start;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: transform var(--motion-duration-instant) ease;
}

.scroll-down:hover {
    transform: translateY(4px);
}

.scroll-down svg {
    width: 36px;
    height: 36px;
}

/* Navigation Active Indicator matching eternal */
.nav-item.active::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    height: 1px;
    width: 100%;
    background-color: #7293F3;
}


/* SERVICES / COMPONENT CARDS */
.card {
    background: var(--color-surface-light);
    border: 1px solid var(--color-border-default);
    padding: var(--space-6);
    border-radius: 8px;
    transition: transform var(--motion-duration-instant) ease, box-shadow var(--motion-duration-instant) ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.05);
}

.card-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-3);
    color: var(--color-text-tertiary);
}

.card-text {
    margin-bottom: var(--space-4);
}

/* LISTS */
.feature-list {
    list-style: none;
    margin-bottom: var(--space-5);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

/* FOOTER */
.footer {
    background-color: var(--color-surface-base);
    color: var(--color-text-inverse);
    padding: var(--space-7) 0 var(--space-5);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-7);
}

.footer h4 {
    color: var(--color-text-inverse);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-links a {
    color: #a3a3a3;
}

.footer-links a:hover {
    color: var(--color-text-inverse);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--space-5);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #a3a3a3;
    font-size: var(--font-size-sm);
}

/* UTILITIES */
.text-center { text-align: center; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-7 { margin-bottom: var(--space-7); }

.mt-7 { margin-top: var(--space-7); }

.bg-muted { background-color: var(--color-surface-muted); }

/* ACCESSIBILITY / SR-ONLY */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* MOBILE RESPONSIVE */
@media (max-width: 768px) {
    .nav-list {
        display: none; /* simple mobile handling for now */
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .section {
        padding: var(--space-5) 0;
    }
}