:root {
    --color-index-light: hsl(277, 30%, 93%);
    --color-index-medium: hsl(277, 30%, 80%);
    --color-index-dark: hsl(277, 30%, 60%);
    --color-productized-ai-light: hsl(0, 30%, 93%);
    --color-productized-ai-medium: hsl(0, 30%, 80%);
    --color-productized-ai-dark: hsl(0, 30%, 60%);
    --color-ml-research-light: hsl(220, 30%, 93%);
    --color-ml-research-medium: hsl(220, 30%, 80%);
    --color-ml-research-dark: hsl(220, 30%, 60%);
    --color-climate-ai-light: hsl(133, 30%, 93%);
    --color-climate-ai-medium: hsl(133, 30%, 80%);
    --color-climate-ai-dark: hsl(133, 30%, 60%);
    --color-cool-things-light: hsl(36, 30%, 93%);
    --color-cool-things-medium: hsl(36, 30%, 80%);
    --color-cool-things-dark: hsl(36, 30%, 60%);
    --color-text: #333;
    --font-h: 'Overpass Mono', monospace;
    --font-text: 'Noto Sans JP', sans-serif;
    ;
}

body {
    margin: 0;
    color: var(--color-text);
    font-family: var(--font-text);
    font-weight: 300;
}

a {
    text-decoration: none;
    font-weight: 400;
}

b, strong {
    font-weight: 400;
}

blockquote {
    background-color: rgb(245, 245, 245);
    margin: 1rem 0 0 0;
}

blockquote p {
    margin: 0;
    padding: 0.7rem 1rem;
}

h1, h2 {
    font-family: var(--font-h);
    font-weight: 300;
}

h1 {
    font-size: 1.4rem;
    line-height: 1.3em;
    margin: 1rem 0 0 0;
}

h2 {
    font-size: 1.1rem;
    font-weight: 400;
    margin: 2rem 0 0 0;
}

@media screen and (max-width: 500px) {
    h1 {
        font-size: 1.3rem;
    }
    h2 {
        font-size: 1rem;
    }
}

p {
    margin: 1rem 0 0 0;
}

ul {
    margin-top: 0.3rem;
}

input {
    border-radius: 0;
}

input[type="email"], input[type="submit"] {
    -webkit-appearance: none;
}

/* Layout */

.grid {
    display: grid;
    grid-template-columns: 1fr 250px;
    column-gap: 1rem;
    justify-content: center;
    align-items: start;
    max-width: calc(600px + 1rem + 250px);
    margin: 0 auto;
    padding: 1rem;
    box-sizing: border-box;
    min-height: calc(100vh - 70px - 20vh);
}

@media screen and (max-width: 500px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

/* Main */

.main {
    margin-bottom: 2rem;
}

.main img {
    width: 100%;
}

.main h1 {
    margin-top: 0;
}

/* Category tweaks: link */

.cat-index a {
    color: var(--color-index-dark);
}

.cat-productized-ai a {
    color: var(--color-productized-ai-dark);
}

.cat-ml-research a {
    color: var(--color-ml-research-dark);
}

.cat-climate-ai a {
    color: var(--color-climate-ai-dark);
}

.cat-cool-things a {
    color: var(--color-cool-things-dark);
}

/* Category tweaks: background */

.cat-index-background {
    background-color: var(--color-index-light);
}

.cat-productized-ai-background {
    background-color: var(--color-productized-ai-light);
}

.cat-ml-research-background {
    background-color: var(--color-ml-research-light);
}

.cat-climate-ai-background {
    background-color: var(--color-climate-ai-light);
}

.cat-cool-things-background {
    background-color: var(--color-cool-things-light);
}

/* Category tweaks: border */

.cat-index-border {
    border: 1px solid var(--color-index-dark);
}

.cat-productized-ai-border {
    border: 1px solid var(--color-productized-ai-dark);
}

.cat-ml-research-border {
    border: 1px solid var(--color-ml-research-dark);
}

.cat-climate-ai-border {
    border: 1px solid var(--color-climate-ai-dark);
}

.cat-cool-things-border {
    border: 1px solid var(--color-cool-things-dark);
}