@font-face {
    font-family: "Literata";
    src: url("assets/literata-var.woff2") format("woff2");
    font-weight: 200 900;
    font-style: normal;
    font-display: swap;
}

/*
   Paper and ink, with one accent used everywhere: a printer's vermilion.
   Light and dark are the same layout with swapped tokens, chosen by the
   system. Every corner on the page is square, because every cover is.
*/

:root {
    --paper: #f1f0ec;
    --paper-sunk: #e7e5df;
    --ink: #17171b;
    --muted: #605f66;
    --hairline: #d3d1c9;
    --accent: #b5301a;
    --accent-ink: #ffffff;
    --shadow: 0 10px 26px rgba(23, 23, 27, .16);
    --gutter: clamp(1.25rem, 5vw, 4.5rem);
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper: #16161a;
        --paper-sunk: #202027;
        --ink: #eceae4;
        --muted: #9d9ba4;
        --hairline: #2f2f38;
        --accent: #ff6f52;
        --accent-ink: #1a0a05;
        --shadow: 0 10px 26px rgba(0, 0, 0, .5);
    }
}

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

html {
    color-scheme: light dark;
}

body {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--paper);
    color: var(--ink);
    font-family: "Literata", Georgia, "Times New Roman", serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--ink);
    text-decoration-color: var(--accent);
    text-underline-offset: 3px;
}

a:hover {
    color: var(--accent);
}

img {
    max-width: 100%;
    display: block;
}

/* ---------- top bar ---------- */

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    height: 68px;
    padding: 0 var(--gutter);
    border-bottom: 1px solid var(--hairline);
}

.topbar__mark {
    font-weight: 700;
    letter-spacing: -.015em;
}

.topbar__source {
    font-size: .8125rem;
    color: var(--muted);
}

/* ---------- search ---------- */

.page {
    flex: 1;
    padding: 0 var(--gutter);
}

.finder {
    padding: clamp(2.5rem, 7vw, 5.5rem) 0 clamp(2rem, 4vw, 3rem);
    max-width: 46rem;
}

.finder__title {
    font-size: clamp(2.75rem, 7.5vw, 5rem);
    font-weight: 300;
    line-height: 1.02;
    letter-spacing: -.035em;
    margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.finder__label {
    display: block;
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: .625rem;
}

.finder__row {
    display: flex;
    flex-wrap: wrap;
    gap: .625rem;
}

.finder__input {
    flex: 1 1 16rem;
    font: inherit;
    font-size: 1.0625rem;
    color: var(--ink);
    background: var(--paper);
    border: 1px solid var(--hairline);
    border-radius: 0;
    padding: .9375rem 1.125rem;
    min-width: 0;
    transition: border-color .18s ease;
}

.finder__input::placeholder {
    color: var(--muted);
}

.finder__input:hover {
    border-color: var(--muted);
}

.finder__input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: inset 0 0 0 1px var(--accent);
}

.finder__input::-webkit-search-cancel-button {
    cursor: pointer;
}

.finder__help {
    margin-top: .75rem;
    font-size: .875rem;
    color: var(--muted);
}

.finder__help[data-tone="error"] {
    color: var(--accent);
}

/* ---------- buttons ---------- */

.btn {
    font: inherit;
    font-size: .9375rem;
    font-weight: 600;
    color: var(--ink);
    background: transparent;
    border: 1px solid var(--hairline);
    border-radius: 0;
    padding: .9375rem 1.75rem;
    cursor: pointer;
    white-space: nowrap;
    transition: border-color .18s ease, background-color .18s ease, transform .08s ease;
}

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

.btn:active {
    transform: translateY(1px);
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.btn--primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-ink);
}

.btn--primary:hover {
    filter: brightness(1.1);
    border-color: var(--accent);
}

.btn[disabled] {
    opacity: .5;
    cursor: progress;
}

/* ---------- results ---------- */

.results {
    padding-bottom: clamp(3rem, 6vw, 5rem);
}

.results__count {
    font-size: .875rem;
    color: var(--muted);
    min-height: 1.6em;
    margin-bottom: 1.5rem;
    border-top: 1px solid var(--hairline);
    padding-top: 1.25rem;
}

.results__count:empty {
    border-top: 0;
    padding-top: 0;
    margin-bottom: 0;
}

.results__foot {
    display: flex;
    justify-content: center;
    margin-top: clamp(2rem, 4vw, 3rem);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: clamp(1.75rem, 3.2vw, 2.75rem) clamp(1.25rem, 2.4vw, 2rem);
    align-items: start;
}

/* ---------- one book ---------- */

.book {
    display: flex;
    flex-direction: column;
}

.book__cover {
    display: block;
    margin-bottom: 1rem;
    align-self: start;
}

/*
   Google hands back thumbnails at every aspect ratio it has on file, including
   a few that are barely taller than a letterbox. Pinning every cover to the
   same 2:3 box is what keeps the grid from going ragged.
*/
.book__cover img {
    width: 100%;
    aspect-ratio: 2 / 3;
    object-fit: contain;
    background: var(--paper-sunk);
    box-shadow: var(--shadow);
    transition: transform .28s cubic-bezier(.16, 1, .3, 1);
}

.book__cover:hover img {
    transform: translateY(-4px);
}

/* Plenty of volumes have no cover art. Set their spine instead of a grey box. */
.book__spine {
    aspect-ratio: 2 / 3;
    background: var(--paper-sunk);
    border-left: 6px solid var(--accent);
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-end;
    padding: 1rem .875rem;
    font-size: .8125rem;
    line-height: 1.35;
    color: var(--muted);
    overflow: hidden;
}

.book__title {
    font-size: 1.0625rem;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -.01em;
}

.book__authors {
    font-size: .9375rem;
    color: var(--muted);
    margin-top: .1875rem;
}

.book__meta {
    margin-top: .5rem;
    font-size: .8125rem;
    color: var(--muted);
}

.book__tag {
    display: inline-block;
    margin-top: .5rem;
    font-size: .6875rem;
    font-weight: 600;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--accent);
}

/* ---------- loading, empty, error ---------- */

.skeleton {
    display: flex;
    flex-direction: column;
    gap: .625rem;
}

.skeleton__cover {
    aspect-ratio: 2 / 3;
}

.skeleton__line {
    height: .7rem;
}

.skeleton__line--short {
    width: 55%;
}

.skeleton__cover,
.skeleton__line {
    background: var(--paper-sunk);
    animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: .45;
    }
}

.note {
    grid-column: 1 / -1;
    max-width: 34rem;
    padding: clamp(2rem, 5vw, 3.5rem) 0;
    border-top: 1px solid var(--hairline);
}

.note__head {
    font-size: 1.375rem;
    font-weight: 400;
    letter-spacing: -.02em;
    margin-bottom: .5rem;
}

.note__body {
    color: var(--muted);
}

.note--error .note__head {
    color: var(--accent);
}

/* ---------- footer ---------- */

.footer {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem 2rem;
    justify-content: space-between;
    padding: 1.5rem var(--gutter);
    border-top: 1px solid var(--hairline);
    font-size: .8125rem;
    color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {

    .book__cover img,
    .btn {
        transition: none;
    }

    .book__cover:hover img {
        transform: none;
    }

    .skeleton__cover,
    .skeleton__line {
        animation: none;
    }
}