:root {
    --foundation-black: #050505;
    --foundation-charcoal: #0f0f0f;
    --foundation-slate: #171717;
    --foundation-border: rgba(255, 255, 255, 0.08);
    --foundation-text: #f5f5f5;
    --foundation-muted: #a3a3a3;
    --foundation-dim: #737373;
    --foundation-accent: #00e676;
    --foundation-accent-soft: rgba(0, 230, 118, 0.12);
    --foundation-prism-start: #ff0844;
    --foundation-prism-end: #0066ff;
    --foundation-font-ui: 'Manrope', system-ui, sans-serif;
    --foundation-font-mono: 'IBM Plex Mono', monospace;
    --foundation-space-2: 8px;
    --foundation-space-3: 12px;
    --foundation-space-4: 16px;
    --foundation-space-6: 24px;
    --foundation-space-8: 32px;
    --foundation-space-10: 40px;
    --foundation-space-12: 48px;
    --foundation-space-16: 64px;
    --foundation-space-20: 80px;
    --foundation-ease: cubic-bezier(0.19, 1, 0.22, 1);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at top left, rgba(255, 8, 68, 0.06), transparent 34%),
        radial-gradient(circle at top right, rgba(0, 102, 255, 0.08), transparent 28%),
        var(--foundation-black);
    color: var(--foundation-text);
    font-family: var(--foundation-font-ui);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.02;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.72' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

a {
    color: inherit;
}

main {
    animation: foundationFade 0.55s var(--foundation-ease) both;
}

@keyframes foundationFade {
    from {
        opacity: 1;
        transform: translateY(12px);
    }

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

.foundation-container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--foundation-space-8);
}

.foundation-container--narrow {
    max-width: 840px;
}

.foundation-hero {
    position: relative;
    overflow: hidden;
    padding: 144px 0 var(--foundation-space-16);
    border-bottom: 1px solid var(--foundation-border);
}

.foundation-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 80%);
    pointer-events: none;
}

.foundation-hero::after {
    content: "";
    position: absolute;
    inset: auto -6% -44% auto;
    width: 520px;
    height: 520px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 230, 118, 0.16), transparent 68%);
    filter: blur(18px);
    pointer-events: none;
}

.foundation-back-link,
.foundation-inline-link {
    display: inline-flex;
    align-items: center;
    gap: var(--foundation-space-2);
    text-decoration: none;
    color: var(--foundation-muted);
    transition: color 0.2s ease;
}

.foundation-back-link {
    font-family: var(--foundation-font-mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--foundation-space-8);
}

.foundation-back-link:hover,
.foundation-inline-link:hover {
    color: var(--foundation-text);
}

.foundation-label {
    display: inline-block;
    margin-bottom: var(--foundation-space-6);
    font-family: var(--foundation-font-mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--foundation-prism-start), var(--foundation-accent), var(--foundation-prism-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.foundation-title {
    max-width: 760px;
    margin: 0 0 var(--foundation-space-6);
    font-size: clamp(2.5rem, 5.2vw, 4.5rem);
    line-height: 1.02;
    letter-spacing: -0.05em;
}

.foundation-title span {
    background: linear-gradient(135deg, var(--foundation-prism-start), var(--foundation-accent), var(--foundation-prism-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.foundation-subtitle {
    max-width: 720px;
    margin: 0;
    font-size: 1.05rem;
    color: var(--foundation-muted);
}

.foundation-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--foundation-space-4);
    margin-top: var(--foundation-space-8);
}

.foundation-meta-item {
    display: inline-flex;
    gap: 6px;
    align-items: center;
    padding: 7px 12px;
    border: 1px solid var(--foundation-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.02);
    font-family: var(--foundation-font-mono);
    font-size: 11px;
    color: var(--foundation-muted);
    text-transform: uppercase;
}

.foundation-meta-item strong {
    color: var(--foundation-text);
    font-weight: 600;
}

.foundation-section {
    padding: var(--foundation-space-16) 0 0;
}

.foundation-grid {
    display: grid;
    gap: var(--foundation-space-8);
    grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.95fr);
    align-items: start;
}

.foundation-panel {
    padding: var(--foundation-space-8);
    border: 1px solid var(--foundation-border);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0.01));
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.22);
}

.foundation-panel + .foundation-panel {
    margin-top: var(--foundation-space-8);
}

.foundation-panel h2 {
    margin: 0 0 var(--foundation-space-4);
    font-size: 1.65rem;
    letter-spacing: -0.03em;
}

.foundation-panel h3 {
    margin: var(--foundation-space-8) 0 var(--foundation-space-3);
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

.foundation-panel p,
.foundation-panel li {
    color: var(--foundation-muted);
    font-size: 0.98rem;
}

.foundation-panel strong {
    color: var(--foundation-text);
}

.foundation-panel ul,
.foundation-panel ol {
    padding-left: 1.25rem;
    margin: 0;
}

.foundation-panel li + li {
    margin-top: 10px;
}

.foundation-side-card {
    position: sticky;
    top: 96px;
}

.foundation-side-card h3 {
    margin-top: 0;
}

.foundation-card-list {
    display: grid;
    gap: var(--foundation-space-4);
}

.foundation-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border: 1px solid rgba(0, 230, 118, 0.25);
    background: var(--foundation-accent-soft);
    color: #8bf8bd;
    font-family: var(--foundation-font-mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.foundation-exercise {
    padding: var(--foundation-space-6);
    border-left: 2px solid var(--foundation-accent);
    background: rgba(0, 230, 118, 0.04);
}

.foundation-exercise h3,
.foundation-takeaways h3 {
    margin-top: 0;
}

.foundation-takeaways {
    padding: var(--foundation-space-6);
    border: 1px solid var(--foundation-border);
    background: rgba(255, 255, 255, 0.02);
}

.foundation-nav {
    display: grid;
    gap: var(--foundation-space-4);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: var(--foundation-space-10);
}

.foundation-nav a {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: var(--foundation-space-6);
    text-decoration: none;
    border: 1px solid var(--foundation-border);
    background: rgba(255, 255, 255, 0.02);
    transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.foundation-nav a:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.16);
    background: rgba(255, 255, 255, 0.03);
}

.foundation-nav span {
    font-family: var(--foundation-font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--foundation-dim);
}

.foundation-nav strong {
    font-size: 1rem;
    letter-spacing: -0.01em;
}

.foundation-footer {
    padding: var(--foundation-space-16) 0 var(--foundation-space-10);
    border-top: 1px solid var(--foundation-border);
    margin-top: var(--foundation-space-20);
    background: var(--foundation-charcoal);
}

.foundation-footer-inner {
    display: flex;
    justify-content: space-between;
    gap: var(--foundation-space-12);
    align-items: flex-start;
}

.foundation-footer-copy {
    max-width: 280px;
}

.foundation-footer-copy strong {
    display: block;
    margin-bottom: var(--foundation-space-2);
    font-size: 14px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.foundation-footer-copy p {
    margin: 0;
    color: var(--foundation-dim);
    font-size: 0.85rem;
}

.foundation-footer-nav {
    display: flex;
    gap: var(--foundation-space-12);
}

.foundation-footer-nav-group h4 {
    margin: 0 0 var(--foundation-space-3);
    font-size: 11px;
    font-family: var(--foundation-font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--foundation-dim);
}

.foundation-footer-nav-group a {
    display: block;
    text-decoration: none;
    color: var(--foundation-muted);
    font-size: 0.92rem;
}

.foundation-footer-nav-group a + a {
    margin-top: 10px;
}

.foundation-footer-bottom {
    padding-top: var(--foundation-space-6);
    margin-top: var(--foundation-space-6);
    border-top: 1px solid var(--foundation-border);
    display: flex;
    justify-content: space-between;
    gap: var(--foundation-space-4);
    color: var(--foundation-dim);
    font-family: var(--foundation-font-mono);
    font-size: 11px;
}

.foundation-footer-bottom a {
    color: inherit;
    text-decoration: none;
}

@media (max-width: 920px) {
    .foundation-grid {
        grid-template-columns: 1fr;
    }

    .foundation-side-card {
        position: static;
    }

    .foundation-footer-inner,
    .foundation-footer-nav,
    .foundation-footer-bottom {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .foundation-container {
        padding: 0 var(--foundation-space-6);
    }

    .foundation-hero {
        padding-top: 124px;
    }

    .foundation-panel {
        padding: var(--foundation-space-6);
    }

    .foundation-nav {
        grid-template-columns: 1fr;
    }
}