:root {
    --ink: #111;
    --text: #2b2b2b;
    --muted: #8a8a8a;
    --line: #ededed;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background: #fff;
    color-scheme: light;
    -webkit-text-size-adjust: 100%;
}

body {
    background: #fff;
    color: var(--ink);
    font: 400 16px/1.6 "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-feature-settings: "cv11";
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--ink);
    color: #fff;
}

a {
    color: inherit;
    text-decoration: underline;
    text-decoration-color: #cfcfcf;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: text-decoration-color 200ms ease;
}

a:hover {
    text-decoration-color: currentColor;
}

.progress {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 10;
    height: 2px;
    background: var(--ink);
    transform: scaleX(0);
    transform-origin: left;
}

.post {
    width: min(100%, 620px);
    margin: 0 auto;
    padding: clamp(48px, 12vh, 112px) 16px 96px;
    animation: rise 800ms var(--ease) both;
}

.by {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 14px;
    text-decoration: none;
}

.by img {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}

.by:hover {
    color: var(--ink);
}

.post header {
    margin: 56px 0 40px;
}

.post h1 {
    font-size: clamp(28px, 5vw, 36px);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.03em;
    text-wrap: balance;
}

.meta {
    margin-top: 12px;
    color: var(--muted);
    font-size: 14px;
    font-variant-numeric: tabular-nums;
}

/* article body */

.prose {
    color: var(--text);
    font-size: 17px;
    line-height: 1.75;
}

.prose > * + * {
    margin-top: 1.1em;
}

.prose h2 {
    margin-top: 2.2em;
    color: var(--ink);
    font-size: 19px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.015em;
}

.prose h3 {
    margin-top: 1.8em;
    color: var(--ink);
    font-size: 17px;
    font-weight: 600;
}

.prose h2 + *,
.prose h3 + * {
    margin-top: 0.6em;
}

.prose strong {
    color: var(--ink);
    font-weight: 600;
}

.prose ul,
.prose ol {
    padding-left: 1.2em;
}

.prose li + li {
    margin-top: 0.35em;
}

.prose blockquote {
    padding-left: 18px;
    border-left: 2px solid var(--ink);
    color: var(--ink);
}

.prose code {
    padding: 1px 5px;
    border-radius: 4px;
    background: #f4f4f4;
    font-size: 0.9em;
}

.prose img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.prose hr {
    height: 1px;
    border: 0;
    background: var(--line);
}

.like-wrap {
    display: flex;
    justify-content: center;
    min-height: 44px;
    margin-top: 56px;
}

.like {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 44px;
    padding: 0 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: #fff;
    color: var(--muted);
    font: inherit;
    font-size: 15px;
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    transition: border-color 200ms ease, color 200ms ease, background-color 200ms ease;
}

.like[hidden] {
    display: none;
}

.like svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    transition: fill 200ms ease, transform 300ms var(--ease);
}

.like:hover {
    border-color: #d5d5d5;
    color: var(--ink);
}

.like[aria-pressed="true"] {
    border-color: var(--ink);
    background: var(--ink);
    color: #fff;
}

.like[aria-pressed="true"] svg {
    fill: currentColor;
}

.like.pop svg {
    animation: heart 450ms var(--ease);
}

@keyframes heart {
    40% { transform: scale(1.35); }
}

.end {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 14px;
}

/* writing index */

.list {
    list-style: none;
    border-top: 1px solid var(--line);
}

.list li {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.list time {
    color: var(--muted);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 2px;
    border-radius: 4px;
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
}

@media (max-width: 480px) {
    .prose {
        font-size: 16px;
    }

    .list li {
        flex-direction: column;
        gap: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .post {
        animation: none;
    }
}