:root {
    /* Swiss Grid Palette */
    --bg-color: #ffffff;
    --text-color: #111111;
    --accent-color: #FF3B30; /* Wondrel Red */
    --grid-line: #eeeeee;
    --secondary-text: #666666;
    --card-bg: #fafafa;

    /* Typography */
    --font-stack: "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --font-size-base: 18px;
    --font-size-h1: 4rem;
    --font-size-h2: 1.5rem;
    --line-height: 1.4;

    /* Spacing */
    --grid-gap: 2rem;
    --container-max: 1200px;
    --section-padding: 4rem 0;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #111111;
        --text-color: #ffffff;
        --accent-color: #FF453A;
        --grid-line: #333333;
        --secondary-text: #aaaaaa;
        --card-bg: #181818;
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 2px solid var(--accent-color);
    transition: background-color 0.2s, color 0.2s;
}

a:hover, a:focus {
    background-color: var(--accent-color);
    color: white;
}

/* Skip link */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--accent-color);
    color: #fff;
    padding: 1rem 1.5rem;
    z-index: 100;
    border-bottom: none;
}

.skip-link:focus {
    left: 1rem;
    top: 1rem;
}

/* Header */
header {
    padding: 6rem 0 4rem 0;
    border-bottom: 4px solid var(--text-color);
}

.wordmark {
    font-size: var(--font-size-h1);
    font-weight: 800;
    margin: 0 0 1rem 0;
    letter-spacing: -0.02em;
    line-height: 1;
}

.wordmark .dot {
    color: var(--accent-color);
}

header .tagline {
    font-size: 1.5rem;
    max-width: 38ch;
    color: var(--secondary-text);
    margin-top: 1rem;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

nav a {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.9rem;
    border-bottom: none;
}

nav a:hover, nav a[aria-current="page"] {
    background: none;
    color: var(--accent-color);
}

/* Main / sections */
main {
    padding: 0;
}

section {
    padding: var(--section-padding);
    border-bottom: 1px solid var(--grid-line);
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 768px) {
    section {
        grid-template-columns: 250px 1fr;
        gap: 4rem;
        align-items: start;
    }
}

h2 {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin: 0;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

h3 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--secondary-text);
    margin: 1.5rem 0 0.5rem 0;
}

section ul {
    list-style: none;
    padding: 0;
}

section li {
    margin-bottom: 0.5rem;
}

/* Product grid */
.product-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.product-card {
    background: var(--card-bg);
    border: 1px solid var(--grid-line);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.product-card h4.product-name {
    color: var(--text-color);
    font-size: 1.15rem;
    text-transform: none;
    letter-spacing: 0;
    margin: 0;
    font-weight: 700;
}

.product-card p {
    margin: 0;
    color: var(--secondary-text);
    flex-grow: 1;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--secondary-text);
    border: 1px solid var(--grid-line);
    padding: 0.2rem 0.5rem;
}

.card-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.card-links a {
    font-size: 0.85rem;
    font-weight: 700;
}

/* Compact list (extras) */
.compact-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 1rem;
}

.compact-list li {
    border-bottom: 1px solid var(--grid-line);
    padding-bottom: 1rem;
}

.compact-list strong {
    display: block;
}

.compact-list span {
    color: var(--secondary-text);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding: 4rem 0;
    font-size: 0.8rem;
    color: var(--secondary-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

footer a {
    text-transform: none;
    letter-spacing: 0;
}