:root {
    --bg: #ffffff;
    --text: #111111;
    --muted: #6b7280;
    --border: #e5e7eb;
    --card: #fafafa;
    --accent: #111111;
    --radius: 12px;
    --container: 960px;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-7: 32px;
    --space-8: 40px;
    --space-9: 56px;
    --space-10: 72px
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0b0b;
        --text: #f3f4f6;
        --muted: #9ca3af;
        --border: #1f2937;
        --card: #0f1115;
        --accent: #f3f4f6
    }
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto
    }
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;
    line-height: 1.6;
    letter-spacing: 0.2px;
    text-rendering: optimizeLegibility
}

.container {
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: var(--space-6)
}

.section {
    padding-block: var(--space-10)
}

.section-title {
    font-size: clamp(24px, 3vw, 32px);
    line-height: 1.2;
    margin: 0 0 var(--space-4)
}

.section-subtitle {
    margin: 0 0 var(--space-7);
    color: var(--muted);
    max-width: 65ch
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: saturate(1.2) blur(6px);
    border-bottom: 1px solid var(--border)
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px
}

.brand {
    font-weight: 600;
    text-decoration: none;
    color: var(--text)
}

.site-nav {
    display: flex;
    gap: var(--space-4)
}

.site-nav a {
    color: var(--muted);
    text-decoration: none;
    padding: 6px 8px;
    border-radius: 8px
}

.site-nav a.is-active,
.site-nav a:hover {
    color: var(--text);
    background: var(--card)
}

.hero .kicker {
    color: var(--muted);
    margin: 0 0 var(--space-3)
}

.headline {
    font-size: clamp(28px, 6vw, 48px);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin: 0 0 var(--space-4)
}

.lede {
    font-size: clamp(16px, 2.2vw, 20px);
    color: var(--muted);
    max-width: 60ch;
    margin: 0 0 var(--space-6)
}

.hero-cta {
    display: flex;
    align-items: center;
    gap: var(--space-4)
}

.link-underline {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid var(--border)
}

.link-underline:hover {
    border-color: var(--text)
}

.sep {
    color: var(--muted)
}

/* Lens panels */
.lens-panels {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    margin-top: var(--space-6)
}

@media (min-width: 800px) {
    .lens-panels {
        grid-template-columns: repeat(3, minmax(0, 1fr))
    }
}

.panel {
    display: flex;
    flex-direction: column;
    gap: 6px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px 16px;
    background: var(--card);
    text-decoration: none;
    color: inherit;
    transition: transform .15s ease, background .2s ease
}

.panel:hover {
    transform: translateY(-2px);
    background: color-mix(in srgb, var(--card) 70%, var(--bg))
}

.panel-title {
    font-weight: 600
}

.panel-sub {
    color: var(--muted);
    font-size: 14px
}

.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5)
}

@media (min-width: 720px) {
    .cards {
        grid-template-columns: repeat(2, minmax(0, 1fr))
    }
}

.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3)
}

.card .meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    color: var(--muted);
    font-size: 14px
}

.card .title {
    font-size: 18px;
    margin: 0
}

.card .desc {
    margin: 0;
    color: var(--muted)
}

.xp {
    border-left: 2px solid var(--border);
    padding-left: var(--space-6);
    margin-bottom: var(--space-7)
}

.xp-title {
    margin: 0 0 var(--space-2)
}

.xp-meta {
    margin: 0 0 var(--space-3);
    color: var(--muted)
}

.xp-body {
    margin: 0;
    max-width: 70ch
}

.filterbar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6)
}

.chip {
    appearance: none;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    padding: 6px 10px;
    border-radius: 999px;
    cursor: pointer
}

.chip:hover {
    color: var(--text)
}

.chip.is-active {
    color: var(--text);
    background: var(--card)
}

.post-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5)
}

@media (min-width: 820px) {
    .post-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr))
    }
}

.post {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    transition: transform .2s ease
}

.post:hover {
    transform: translateY(-2px)
}

.post .post-title {
    font-size: 20px;
    line-height: 1.3;
    margin: 0
}

.post .post-excerpt {
    margin: 0;
    color: var(--muted)
}

.post .post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    color: var(--muted);
    font-size: 14px
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px
}

.tag::before {
    content: "#";
    color: var(--border)
}

.inline-link {
    color: inherit
}

.inline-link:hover {
    color: var(--accent)
}

.site-footer {
    border-top: 1px solid var(--border);
    padding-block: var(--space-6);
    color: var(--muted)
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between
}

.reader {
    position: fixed;
    inset: 0;
    z-index: 100
}

.reader[hidden] {
    display: none
}

.reader-backdrop {
    position: absolute;
    inset: 0;
    background: color-mix(in srgb, var(--bg) 80%, black)
}

.reader-panel {
    position: absolute;
    inset: auto 0 0 0;
    max-height: 85vh;
    margin: 0 auto;
    max-width: min(880px, 92vw);
    background: var(--bg);
    border: 1px solid var(--border);
    border-bottom: none;
    border-radius: 16px 16px 0 0;
    box-shadow: 0 10px 40px rgba(0, 0, 0, .25);
    overflow: auto;
    padding: var(--space-7)
}

@media (min-width:900px) {
    .reader-panel {
        inset: 5% 0 auto 0;
        border-radius: 16px
    }
}

.reader-close {
    position: absolute;
    top: 10px;
    right: 14px;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 28px;
    cursor: pointer
}

.reader-head {
    margin-bottom: var(--space-5)
}

.reader-title {
    margin: 0 0 var(--space-2);
    font-size: clamp(22px, 3vw, 32px)
}

.reader-meta {
    margin: 0;
    color: var(--muted)
}

.reader-content {
    max-width: 70ch
}

.reader-content h4 {
    margin-top: var(--space-6);
    margin-bottom: var(--space-3)
}

.reader-content p {
    margin: 0 0 var(--space-4)
}

:focus-visible {
    outline: 2px solid color-mix(in srgb, var(--accent) 70%, var(--border));
    outline-offset: 2px
}