@font-face {
    font-family: "Petrona";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("fonts/petrona-latin-400.woff2") format("woff2");
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
    font-family: "Petrona";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("fonts/petrona-latin-ext-400.woff2") format("woff2");
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@property --dot-color {
    syntax: "<color>";
    inherits: false;
    initial-value: #DCDCDC;
}

/* ==========================================================================
   Tokens
   ========================================================================== */

:root {
    color-scheme: light;
    --background: #FBFAF8;
    --foreground: #171614;
    --muted: #5F5D59;
    --grid-color: #DCDCDC;
    --accent: #C97248;
    --accent-strong: #A6532E;
    --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
    --on-accent: var(--background);
    --surface: #FFFFFF;
    --surface-border: rgb(23 22 20 / 0.07);
    --fill: #F3F2ED;
    --track: #C2C1C2;
    --glass: rgb(255 255 255 / 0.72);
    --tile-shadow: 0 1px 2px rgb(23 22 20 / 0.04), 0 24px 48px -32px rgb(23 22 20 / 0.25);
    --toggle-track: #F5F5F5;
    --toggle-thumb: #FFFFFF;
    --toggle-icon: #BDBDBD;
    --toggle-shadow: 0 2px 6px rgb(0 0 0 / 0.1);
    --wallpaper: linear-gradient(140deg, #F1D7B8, #D98E62 55%, #9C4A2C);
    --screen-control: #000000;
    --screen-track: #E2E1DF;
    --screen-label: #1C1B1B;
    --screen-thumb-shadow: 0 1px 3px rgb(0 0 0 / 0.15);
    --font-serif: "Petrona", Georgia, serif;
    --theme-transition: 200ms ease;
    --reveal-easing: cubic-bezier(0.2, 0.7, 0.2, 1);
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --page-gutter: 1.5rem;
    --page-inline-start: 5.333333rem;
    --page-inline-end: 3rem;
    --content-max: 85rem;
    --hero-padding-block: 5.875rem;
    --dock-inset: 1.625rem;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --background: #171614;
    --foreground: #FBFAF8;
    --muted: #A9A7A2;
    --grid-color: #3B3B3B;
    --accent: #F4AF60;
    --accent-strong: #F4AF60;
    --surface: #1F1E1C;
    --surface-border: rgb(251 250 248 / 0.07);
    --fill: #2A2826;
    --track: #575658;
    --glass: rgb(36 34 32 / 0.72);
    --tile-shadow: 0 24px 48px -32px rgb(0 0 0 / 0.6);
    --toggle-track: #2F2F2F;
    --toggle-thumb: #1D1D1D;
    --toggle-icon: #939393;
    --toggle-shadow: 0 2px 6px rgb(0 0 0 / 0.35);
    --wallpaper: linear-gradient(140deg, #4A3020, #2A1E17 55%, #171614);
    --screen-control: #FFFFFF;
    --screen-track: #2E2D2B;
    --screen-label: #E5E5E5;
    --screen-thumb-shadow: none;
}

/* ==========================================================================
   Base
   ========================================================================== */

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-block-start: 2rem;
}

body {
    min-height: 100vh;
    min-height: 100svh;
    margin: 0;
    background-color: var(--background);
    color: var(--foreground);
    font-family: system-ui, sans-serif;
    line-height: 1.5;
    transition: background-color var(--theme-transition), color var(--theme-transition);
}

body::before {
    --dot-color: var(--grid-color);
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: radial-gradient(circle, var(--dot-color) 0.75px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
    transition: --dot-color var(--theme-transition);
}

.dot-grid {
    position: fixed;
    inset: 0;
    z-index: -1;
    display: none;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.has-dot-grid .dot-grid {
    display: block;
}

.has-dot-grid body::before {
    display: none;
}

img,
svg {
    display: block;
}

button {
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    cursor: pointer;
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

p,
figure {
    margin: 0;
}

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

[tabindex="-1"]:focus {
    outline: none;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.icon-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

.icon {
    flex: none;
    width: 1.25rem;
    height: 1.25rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.skip-link {
    position: absolute;
    inset-block-start: 1rem;
    inset-inline-start: 1rem;
    z-index: 100;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background-color: var(--foreground);
    color: var(--background);
    font-weight: 600;
    text-decoration: none;
    transform: translateY(-200%);
}

.skip-link:focus {
    transform: none;
}

.container {
    width: min(100% - var(--page-inline-start) * 2, var(--content-max));
    margin-inline: auto;
}

.accent {
    color: var(--accent);
    transition: color var(--theme-transition);
}

/* ==========================================================================
   Header and theme toggle
   ========================================================================== */

/* Stacks above the page so the hero, which follows it and is positioned, can't cover its links;
   the header itself lets clicks through, so only the title and links catch them. */
.site-header {
    position: absolute;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: 5;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem 2rem;
    padding-block: 3.75rem;
    padding-inline: max(var(--page-inline-start), (100% - var(--content-max)) / 2);
    pointer-events: none;
}

.site-header > * {
    pointer-events: auto;
}

.site-title {
    display: inline-block;
    color: inherit;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.2;
    text-decoration: none;
    transition: scale 250ms var(--ease-out-expo);
}

.header-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
}

.header-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding-inline: 1rem 1.125rem;
    border: 1px solid var(--surface-border);
    border-radius: 999px;
    background-color: var(--fill);
    color: var(--foreground);
    font-size: 0.875rem;
    text-decoration: none;
    transition:
        background-color var(--theme-transition),
        border-color var(--theme-transition),
        color var(--theme-transition),
        scale 250ms var(--ease-out-expo);
}

.header-links .icon {
    width: 1rem;
    height: 1rem;
    color: var(--accent-strong);
}

.theme-toggle {
    position: fixed;
    inset-block-end: var(--dock-inset);
    inset-inline-start: 3rem;
    z-index: 10;
    display: flex;
    padding: 0.25rem;
    border-radius: 999px;
    background-color: var(--toggle-track);
    transition: background-color var(--theme-transition);
}

.theme-toggle[hidden] {
    display: none;
}

.theme-toggle::before {
    content: "";
    position: absolute;
    inset-block-start: 0.25rem;
    inset-inline-start: 0.25rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background-color: var(--toggle-thumb);
    box-shadow: var(--toggle-shadow);
    transition:
        transform var(--theme-transition),
        background-color var(--theme-transition),
        box-shadow var(--theme-transition);
}

:root[data-theme="dark"] .theme-toggle::before {
    transform: translateX(100%);
}

.theme-option {
    position: relative;
    display: grid;
    place-items: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    color: var(--toggle-icon);
    transition: color var(--theme-transition), scale 250ms var(--ease-out-expo);
}

.theme-option:focus-visible {
    outline-offset: 2px;
}

.theme-option svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 4rem;
    min-height: 100vh;
    min-height: 100svh;
    padding-block: var(--hero-padding-block);
    padding-inline:
        max(var(--page-inline-start), (100% - var(--content-max)) / 2)
        max(var(--page-inline-end), (100% - var(--content-max)) / 2);
}

.hero-copy {
    display: grid;
    justify-items: start;
    gap: 4rem;
}

.hero-title {
    max-width: 8em;
    margin: 0;
    font-family: var(--font-serif);
    font-size: min(4.6rem, 4.9vw);
    font-weight: 400;
    line-height: 1.1;
    text-wrap: balance;
    overflow-wrap: break-word;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
}

.app-store-button {
    display: block;
    border-radius: 0.5rem;
    transition: scale 250ms var(--ease-out-expo);
}

.app-store-button img {
    width: auto;
    height: 4rem;
}

.tour-button {
    display: inline-flex;
    align-items: center;
    min-height: 4rem;
    padding-inline: 1.5rem;
    border-radius: 0.4375rem;
    background-color: var(--accent);
    color: var(--on-accent);
    font-family: var(--font-serif);
    font-size: 1.5rem;
    line-height: 1.25;
    text-decoration: none;
    transition:
        background-color var(--theme-transition),
        color var(--theme-transition),
        scale 250ms var(--ease-out-expo);
}

/* --pointer-x and --pointer-y (-1 to 1) are set by hero.js; without it they fall back to a resting 0. */
.hero-devices {
    --device-aspect-ratio: calc(385 / 776);
    --back-device-offset: 0.675;
    --back-device-scale: 0.9;
    --device-group-span: calc(var(--back-device-offset) + var(--back-device-scale));
    /* Nudges the devices down, clear of the header's navigation. They're centered, so their height
       budget gives up twice the shift to keep their bottom edge from moving closer to the fold. */
    --hero-devices-shift: 1.5rem;
    position: relative;
    inset-block-start: var(--hero-devices-shift);
    width: min(
        24.0625rem * var(--device-group-span),
        (100svh - 2 * var(--hero-padding-block) - 2 * var(--hero-devices-shift)) * var(--device-aspect-ratio) * var(--device-group-span),
        40vw
    );
    transform:
        perspective(75rem)
        rotateX(calc(var(--pointer-y, 0) * -3deg))
        rotateY(calc(var(--pointer-x, 0) * 4deg));
}

.hero-devices picture {
    display: contents;
}

.device {
    height: auto;
}

.device-front {
    position: relative;
    width: calc(100% / var(--device-group-span));
    translate: calc(var(--pointer-x, 0) * 0.375rem) calc(var(--pointer-y, 0) * 0.375rem);
}

.device-back {
    position: absolute;
    inset-block-start: 50%;
    inset-inline-start: calc(100% * var(--back-device-offset) / var(--device-group-span));
    width: calc(100% * var(--back-device-scale) / var(--device-group-span));
    transform: translateY(-50%) rotate(2deg);
    translate: calc(var(--pointer-x, 0) * -0.875rem) calc(var(--pointer-y, 0) * -0.625rem);
}

.device-image {
    width: 100%;
    height: auto;
}

/* A desktop-only hint below the fold line; its dot travels like the ones in the tour demos. */
.scroll-cue {
    position: absolute;
    inset-block-end: var(--dock-inset);
    inset-inline-start: 50%;
    display: grid;
    justify-items: center;
    gap: 0.75rem;
    color: var(--muted);
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-decoration: none;
    text-transform: uppercase;
    translate: -50% 0;
    transition: color var(--theme-transition), scale 250ms var(--ease-out-expo);
}

.scroll-cue-line {
    position: relative;
    width: 1px;
    height: 2.5rem;
    background-color: color-mix(in srgb, var(--muted) 35%, transparent);
}

.scroll-cue-line::after {
    content: "";
    position: absolute;
    inset-block-start: 0;
    inset-inline-start: -2px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background-color: var(--accent);
    animation: cue-travel 2s var(--reveal-easing) infinite;
}

/* ==========================================================================
   Shared section typography
   ========================================================================== */

.eyebrow {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-block-end: 1.5rem;
    color: var(--accent-strong);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.chapter-numeral {
    display: inline-grid;
    place-items: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding-inline: 0.625rem;
    border: 1px solid currentColor;
    border-radius: 999px;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: none;
}

.section-title {
    margin: 0;
    font-family: var(--font-serif);
    font-size: clamp(2.75rem, 1.5rem + 3.2vw, 4.6rem);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.01em;
    text-wrap: balance;
}

.lede {
    max-width: 34em;
    margin-block-start: 1.5rem;
    color: var(--muted);
    font-size: clamp(1.125rem, 1rem + 0.35vw, 1.3125rem);
    line-height: 1.6;
    text-wrap: pretty;
}

/* ==========================================================================
   Tour introduction and contents
   ========================================================================== */

.tour-intro {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: end;
    gap: 4rem clamp(3rem, 6vw, 7rem);
    padding-block: 10rem 6rem;
}

.contents-title {
    margin: 0;
    padding-block-end: 1rem;
    border-block-end: 1px solid var(--surface-border);
    color: var(--muted);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

/* The divider sits on the list item, so it stays put while the link itself scales on hover. */
.contents-list li {
    border-block-end: 1px solid var(--surface-border);
}

.contents-list a {
    display: grid;
    grid-template-columns: 3rem auto minmax(1.5rem, 1fr) auto;
    align-items: baseline;
    column-gap: 0.75rem;
    padding-block: 1.125rem;
    color: inherit;
    font-family: var(--font-serif);
    font-size: 1.375rem;
    line-height: 1.3;
    text-decoration: none;
    transition: scale 250ms var(--ease-out-expo);
}

.contents-numeral {
    color: var(--accent-strong);
}

.contents-name {
    transition: color var(--theme-transition);
}

.contents-leader {
    height: 2px;
    background-image: radial-gradient(circle, var(--muted) 0.75px, transparent 1px);
    background-size: 8px 2px;
    opacity: 0.5;
}

.contents-topic {
    color: var(--muted);
    font-family: system-ui, sans-serif;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* ==========================================================================
   Chapters
   ========================================================================== */

.chapter {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 3rem clamp(3rem, 6vw, 7rem);
    padding-block: 7rem;
}

.chapter-wide {
    grid-template-columns: minmax(0, 1fr);
}

.chapter-wide .chapter-copy {
    max-width: 44rem;
}

.specs {
    margin-block: 2.5rem 0;
    border-block-start: 1px solid var(--surface-border);
    font-size: 0.9375rem;
}

.specs > div {
    display: flex;
    justify-content: space-between;
    gap: 1.5rem;
    padding-block: 0.875rem;
    border-block-end: 1px solid var(--surface-border);
}

.specs dt {
    font-weight: 600;
}

.specs dd {
    margin: 0;
    color: var(--muted);
    text-align: end;
}

@media (min-width: 60.0625rem) and (min-height: 46rem) {
    .chapter:not(.chapter-wide) .chapter-copy {
        position: sticky;
        inset-block-start: 7rem;
    }
}

/* ==========================================================================
   Bento tiles
   ========================================================================== */

.bento {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
}

.bento-three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tile {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 0;
    padding: 1.75rem;
    overflow: hidden;
    border: 1px solid var(--surface-border);
    border-radius: 1.75rem;
    background-color: var(--surface);
    box-shadow: var(--tile-shadow);
    transition:
        background-color var(--theme-transition),
        border-color var(--theme-transition),
        scale 300ms var(--ease-out-expo);
}

.tile-wide {
    grid-column: 1 / -1;
}

.tile-heading {
    display: grid;
    align-content: start;
    gap: 0.5rem;
}

.tile-title {
    margin: 0;
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 1.2;
    text-wrap: balance;
}

.tile-text {
    color: var(--muted);
    font-size: 0.9375rem;
    text-wrap: pretty;
}

.tile-icon {
    display: grid;
    place-items: center;
    width: 2.75rem;
    height: 2.75rem;
    margin-block-end: 1rem;
    border-radius: 0.875rem;
    background-color: var(--accent-soft);
    color: var(--accent-strong);
}

.tile > .tile-text:not(:last-child) {
    margin-block-end: 1.25rem;
}

.tile > :is(.shelf-tree, .chips, .sleep-demo, .bookmark-demo, .source-list, .option-list, .press-list) {
    margin-block-start: auto;
}

.tile-device {
    position: relative;
    grid-row: span 2;
    min-height: 30rem;
    padding: 0;
    background-image: radial-gradient(120% 80% at 50% 0%, var(--accent-soft), transparent 70%);
}

.tile-device img {
    position: absolute;
    inset-block-start: 2.5rem;
    inset-inline-start: 50%;
    width: min(78%, 17rem);
    height: auto;
    transform: translateX(-50%);
}

/* ==========================================================================
   Shared demo pieces
   ========================================================================== */

.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.chip {
    padding: 0.5rem 0.875rem;
    border-radius: 999px;
    background-color: var(--fill);
    font-size: 0.875rem;
    font-weight: 500;
}

.chip.is-selected {
    background-color: var(--accent-soft);
    color: var(--accent-strong);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent);
    font-weight: 600;
}

.option-list,
.source-list {
    display: grid;
    overflow: hidden;
    border-radius: 1rem;
    background-color: var(--fill);
    font-size: 0.9375rem;
}

.option-list li,
.source-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
}

.option-list li {
    justify-content: space-between;
}

.option-list li + li,
.source-list li + li {
    border-block-start: 1px solid var(--surface-border);
}

.option-list .is-selected {
    color: var(--accent-strong);
    font-weight: 600;
}

.option-list .option-new {
    justify-content: flex-start;
    color: var(--accent-strong);
    font-weight: 600;
}

.source-list .icon {
    color: var(--accent-strong);
}

.status-dot {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    margin-inline-start: auto;
    color: var(--muted);
    font-size: 0.8125rem;
}

.status-dot::before {
    content: "";
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background-color: #34C759;
}

.progress-bar {
    display: block;
    height: 0.25rem;
    border-radius: 999px;
    background: linear-gradient(to right, var(--accent) var(--progress), var(--track) 0);
}

.round-button {
    display: grid;
    flex: none;
    place-items: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    background-color: var(--fill);
    transition: background-color var(--theme-transition), scale 250ms var(--ease-out-expo);
}

/* Book covers */

.cover {
    --cover-background: #16324A;
    --cover-ink: #F3E9D2;
    --cover-mark: #E9B872;
    --cover-wave: #0E2234;
    position: relative;
    display: grid;
    flex: none;
    align-content: space-between;
    justify-items: center;
    width: 3rem;
    aspect-ratio: 1;
    padding: 9% 8%;
    overflow: hidden;
    border-radius: 10%;
    background-color: var(--cover-background);
    color: var(--cover-ink);
    container-type: inline-size;
    text-align: center;
    box-shadow: inset 0 0 0 1px rgb(255 255 255 / 0.08), 0 1px 3px rgb(0 0 0 / 0.15);
}

.cover::before {
    content: "";
    position: absolute;
    inset-block-start: 50%;
    inset-inline-start: 50%;
    width: 44%;
    aspect-ratio: 1;
    border-radius: 50%;
    background-color: var(--cover-mark);
    transform: translate(-50%, -45%);
}

.cover::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: 0;
    height: 30%;
    background:
        radial-gradient(circle at 50% 0, transparent 58%, var(--cover-wave) 60%) 0 0 / 25% 40% repeat-x,
        linear-gradient(var(--cover-wave), var(--cover-wave)) 0 100% / 100% 62% no-repeat;
}

.cover-title,
.cover-author {
    position: relative;
    z-index: 1;
}

.cover-title {
    font-family: var(--font-serif);
    font-size: 13cqi;
    line-height: 1.05;
}

.cover-author {
    font-size: 6.5cqi;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.cover[data-variant="1"] {
    --cover-background: #F1E6D0;
    --cover-ink: #2B2A28;
    --cover-mark: #C97248;
    --cover-wave: #D9C6A2;
}

.cover[data-variant="2"] {
    --cover-background: #6E2A1C;
    --cover-ink: #F6E7CF;
    --cover-mark: #F4AF60;
    --cover-wave: #4E1D13;
}

.cover-pride {
    --cover-background: #5E7461;
    --cover-ink: #F6F1E4;
    --cover-mark: #E7D7B1;
    --cover-wave: #4A5D4D;
}

.cover-emma {
    --cover-background: #B9837E;
    --cover-ink: #FFF7F0;
    --cover-mark: #F3D3B5;
    --cover-wave: #9E6964;
}

/* ==========================================================================
   Chapter I: library
   ========================================================================== */

.shelf-tree {
    display: grid;
    gap: 0.375rem;
}

.shelf-tree li {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.75rem;
    background-color: var(--fill);
    font-size: 0.9375rem;
}

.shelf-tree li:nth-child(2) {
    margin-inline-start: 2rem;
}

.shelf-tree li:nth-child(3) {
    margin-inline-start: 4rem;
}

.shelf-tree li:nth-child(4) {
    margin-inline-start: 6rem;
}

.shelf-tree li + li::before {
    content: "";
    position: absolute;
    inset-block-start: -0.375rem;
    inset-inline-start: -0.75rem;
    width: 0.75rem;
    height: calc(50% + 0.375rem);
    border-inline-start: 1.5px solid var(--track);
    border-block-end: 1.5px solid var(--track);
    border-end-start-radius: 0.5rem;
}

.shelf-tree li:last-child {
    background-color: var(--accent-soft);
    color: var(--accent-strong);
    font-weight: 600;
}

.shelf-tree .icon {
    color: var(--accent-strong);
}

.shelf-count {
    margin-inline-start: auto;
    color: var(--muted);
    font-size: 0.8125rem;
    font-weight: 400;
    white-space: nowrap;
}

.search-demo {
    display: grid;
    gap: 0.75rem;
    margin-block-start: 1.25rem;
}

.search-field {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    background-color: var(--fill);
    color: var(--muted);
}

.search-query {
    color: var(--foreground);
}

.search-query::after {
    content: "";
    display: inline-block;
    width: 2px;
    height: 1.1em;
    margin-inline-start: 1px;
    background-color: var(--accent);
    vertical-align: text-bottom;
    animation: caret-blink 1.1s steps(1) infinite;
}

.search-results {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
}

.search-results li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
    padding: 0.625rem;
    border-radius: 1rem;
    background-color: var(--fill);
    color: var(--muted);
    font-size: 0.8125rem;
}

.search-results strong {
    display: block;
    color: var(--foreground);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.3;
}

.search-shelf {
    display: grid;
    flex: none;
    place-items: center;
    width: 3rem;
    aspect-ratio: 1;
    border-radius: 10%;
    background-color: var(--accent-soft);
    color: var(--accent-strong);
}

/* ==========================================================================
   Chapter II: player
   ========================================================================== */

.speed-demo {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
        "heading readout"
        "control control";
    gap: 1.5rem 2rem;
}

.speed-demo .tile-heading {
    grid-area: heading;
}

.speed-readout {
    grid-area: readout;
    text-align: end;
}

.speed-value {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(3rem, 2rem + 3vw, 4.5rem);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.speed-remaining {
    margin-block-start: 0.5rem;
    color: var(--muted);
    font-size: 0.875rem;
}

.speed-remaining span {
    color: var(--foreground);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.speed-control {
    grid-area: control;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.speed-slider {
    --speed-progress: 9.0909%;
    flex: 1;
    min-width: 0;
    height: 2.75rem;
    margin: 0;
    background: transparent;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

.speed-slider:focus-visible {
    outline-offset: 2px;
    border-radius: 999px;
}

.speed-slider::-webkit-slider-runnable-track {
    height: 0.375rem;
    border-radius: 999px;
    background: linear-gradient(to right, var(--accent) var(--speed-progress), var(--track) 0);
}

.speed-slider::-webkit-slider-thumb {
    width: 2.25rem;
    height: 1.5rem;
    margin-block-start: -0.5625rem;
    border-radius: 999px;
    background-color: #FFFFFF;
    box-shadow: 0 1px 4px rgb(0 0 0 / 0.2), 0 0 0 0.5px rgb(0 0 0 / 0.08);
    -webkit-appearance: none;
    appearance: none;
}

.speed-slider::-moz-range-track {
    height: 0.375rem;
    border-radius: 999px;
    background-color: var(--track);
}

.speed-slider::-moz-range-progress {
    height: 0.375rem;
    border-radius: 999px;
    background-color: var(--accent);
}

.speed-slider::-moz-range-thumb {
    width: 2.25rem;
    height: 1.5rem;
    border: 0;
    border-radius: 999px;
    background-color: #FFFFFF;
    box-shadow: 0 1px 4px rgb(0 0 0 / 0.2), 0 0 0 0.5px rgb(0 0 0 / 0.08);
}

.sleep-countdown {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-block-end: 0.75rem;
    padding: 0.375rem 0.75rem;
    border-radius: 999px;
    background-color: var(--accent-soft);
    color: var(--accent-strong);
    font-size: 0.8125rem;
    font-weight: 600;
}

.sleep-countdown .icon {
    width: 1rem;
    height: 1rem;
}

.sleep-countdown span {
    font-variant-numeric: tabular-nums;
}

.bookmark-demo {
    display: flex;
    gap: 0.875rem;
    padding: 1rem;
    border-radius: 1rem;
    background-color: var(--fill);
}

.bookmark-demo .icon {
    color: var(--accent-strong);
}

.bookmark-meta {
    color: var(--muted);
    font-size: 0.8125rem;
    font-variant-numeric: tabular-nums;
}

.bookmark-note {
    margin-block-start: 0.25rem;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    line-height: 1.35;
}

/* ==========================================================================
   Chapter III: import
   ========================================================================== */

.import-demo {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 1.75rem 2rem;
}

.segmented {
    display: inline-flex;
    min-inline-size: 0;
    margin: 0;
    padding: 0.25rem;
    border: 0;
    border-radius: 999px;
    background-color: var(--fill);
}

.segmented label {
    padding: 0.625rem 1rem;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
    transition:
        background-color var(--theme-transition),
        color var(--theme-transition),
        box-shadow var(--theme-transition),
        scale 250ms var(--ease-out-expo);
}

.segmented input:checked + label {
    background-color: var(--surface);
    color: var(--foreground);
    box-shadow: var(--toggle-shadow);
}

.segmented input:focus-visible + label {
    outline: 2px solid var(--foreground);
    outline-offset: 2px;
}

.import-flow {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 4rem minmax(0, 1fr);
    align-items: center;
}

.import-files {
    display: grid;
    gap: 0.5rem;
}

.import-files li {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 0.875rem;
    border-radius: 0.875rem;
    background-color: var(--fill);
    font-size: 0.875rem;
}

.import-files .icon {
    width: 1rem;
    height: 1rem;
    color: var(--accent-strong);
}

.import-files span {
    margin-inline-start: auto;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.import-connector {
    position: relative;
    height: 2px;
    margin-inline: 0.75rem;
    background-image: radial-gradient(circle, var(--track) 1px, transparent 1.25px);
    background-size: 6px 2px;
}

.import-connector::after {
    content: "";
    position: absolute;
    inset-block-start: 50%;
    inset-inline-start: 0;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background-color: var(--accent);
    transform: translateY(-50%);
    animation: travel 1.8s var(--reveal-easing) infinite;
}

.import-result {
    display: grid;
}

.import-merged,
.import-separate {
    grid-area: 1 / 1;
    align-self: center;
    transition:
        opacity 400ms var(--reveal-easing),
        transform 400ms var(--reveal-easing),
        visibility 400ms;
}

.import-merged {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: 1.25rem;
    background-color: var(--fill);
}

.import-merged .cover {
    width: 5.5rem;
}

.import-merged strong {
    display: block;
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 400;
    line-height: 1.2;
}

.import-merged p {
    color: var(--muted);
    font-size: 0.875rem;
}

.import-merged p span {
    display: block;
    margin-block-start: 0.5rem;
    color: var(--accent-strong);
    font-size: 0.8125rem;
    font-weight: 600;
}

.import-separate {
    display: grid;
    gap: 0.5rem;
}

.import-separate li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.4375rem 0.75rem 0.4375rem 0.4375rem;
    border-radius: 0.875rem;
    background-color: var(--fill);
    font-size: 0.875rem;
    font-weight: 600;
}

.import-separate .cover {
    width: 2rem;
}

.import-demo:has(#save-separately:checked) .import-merged,
.import-demo:has(#save-merged:checked) .import-separate {
    visibility: hidden;
    opacity: 0;
    transform: scale(0.94);
}

/* ==========================================================================
   Chapter IV: sync
   ========================================================================== */

.sync-story {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 0.75rem;
    margin-block-start: 1.5rem;
}

.sync-device {
    display: grid;
    gap: 0.875rem;
    padding: 1rem;
    border-radius: 1.25rem;
    background-color: var(--fill);
}

.sync-moment {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted);
    font-size: 0.8125rem;
    font-weight: 600;
}

.sync-moment .icon {
    width: 1rem;
    height: 1rem;
}

.sync-book {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sync-book p {
    color: var(--muted);
    font-size: 0.8125rem;
}

.sync-book strong {
    display: block;
    color: var(--foreground);
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 400;
}

.sync-path {
    position: relative;
    display: grid;
    place-items: center;
    width: 5.5rem;
    height: 3rem;
    color: var(--accent-strong);
}

.sync-path::before {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-start: 50%;
    height: 2px;
    background-image: radial-gradient(circle, var(--track) 1px, transparent 1.25px);
    background-size: 6px 2px;
}

.sync-path::after {
    content: "";
    position: absolute;
    inset-block-start: 50%;
    inset-inline-start: 0;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background-color: var(--accent);
    transform: translateY(-50%);
    animation: travel 2.4s var(--reveal-easing) infinite;
}

.sync-path .icon {
    position: relative;
    z-index: 1;
    box-sizing: content-box;
    width: 1.5rem;
    height: 1.5rem;
    padding: 0.5rem;
    border-radius: 50%;
    background-color: var(--surface);
    box-shadow: 0 0 0 1px var(--surface-border);
}

/* ==========================================================================
   Chapter V: metadata
   ========================================================================== */

.edit-demo {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: 2rem;
}

.edit-cover {
    display: grid;
    justify-items: center;
    gap: 0.875rem;
    text-align: center;
}

.cover-button {
    border-radius: 1.1rem;
    transition: transform 300ms var(--reveal-easing);
}

.cover-button .cover {
    width: 11rem;
    box-shadow: 0 18px 36px -18px rgb(0 0 0 / 0.5), inset 0 0 0 1px rgb(255 255 255 / 0.08);
}

.edit-fields {
    display: grid;
    gap: 1rem;
    margin: 0;
}

.edit-group {
    overflow: hidden;
    border-radius: 1rem;
    background-color: var(--fill);
    font-size: 0.9375rem;
}

.edit-group > div {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
}

.edit-group > div + div {
    border-block-start: 1px solid var(--surface-border);
}

.edit-group dt {
    color: var(--muted);
}

.edit-group dd {
    margin: 0;
    font-weight: 500;
    text-align: end;
}

.edit-group dd.is-empty {
    color: var(--muted);
    font-weight: 400;
}

.edit-group .edit-description {
    flex-direction: column;
    gap: 0.25rem;
}

.edit-description dd {
    font-weight: 400;
    text-align: start;
}

/* ==========================================================================
   Chapter VI: extras
   ========================================================================== */

.bento-three .widget-tile {
    grid-column: span 2;
}

.widgets {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    margin-block-start: 1.5rem;
    padding: 1.75rem;
    border-radius: 1.25rem;
    background-image: var(--wallpaper);
}

.widget {
    position: relative;
    height: 10rem;
    overflow: hidden;
    border-radius: 1.5rem;
    box-shadow: 0 12px 32px -16px rgb(0 0 0 / 0.5);
}

.widget-small {
    width: 10rem;
}

.widget-small .cover {
    width: 100%;
    border-radius: 0;
}

.widget-small::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: 0;
    height: 4rem;
    background-image: linear-gradient(transparent, rgb(0 0 0 / 0.85));
}

.widget-small-bar {
    position: absolute;
    inset-inline: 0;
    inset-block-end: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.75rem;
    color: #FFFFFF;
    font-size: 0.875rem;
    font-weight: 600;
}

.widget-small-bar .widget-play {
    width: 2rem;
    height: 2rem;
    background-color: #FFFFFF;
    color: #171614;
}

.widget-medium {
    display: flex;
    gap: 1rem;
    width: min(21.5rem, 100%);
    padding: 1rem;
    background-color: var(--background);
}

.widget-medium .cover {
    width: auto;
    height: 100%;
    border-radius: 0.75rem;
}

.widget-medium-body {
    display: flex;
    flex: 1;
    flex-direction: column;
    justify-content: space-between;
    min-width: 0;
}

.widget-medium-body p {
    color: var(--muted);
    font-size: 0.8125rem;
}

.widget-medium-body strong {
    display: block;
    color: var(--foreground);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
}

.widget-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.widget-play {
    display: grid;
    place-items: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    background-color: var(--foreground);
    color: var(--background);
}

.widget-play .icon {
    width: 1rem;
    height: 1rem;
}

.widget-skip {
    position: relative;
    display: grid;
    place-items: center;
}

.widget-skip .icon {
    width: 2rem;
    height: 2rem;
}

.widget-skip span {
    position: absolute;
    font-size: 0.5625rem;
    font-weight: 700;
}

.press-list {
    display: grid;
    gap: 0.625rem;
    font-size: 0.9375rem;
}

.press-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.press-dots {
    display: inline-flex;
    gap: 0.25rem;
    width: 2.25rem;
}

.press-dots i {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background-color: var(--accent);
}

.theme-tile {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.theme-tile .tile-heading {
    max-width: 30rem;
}

.theme-tile .tile-icon {
    margin-block-end: 0.5rem;
}

.theme-swatches {
    display: flex;
    gap: 1rem;
}

.theme-swatch {
    position: relative;
    display: grid;
    place-items: center;
    width: 8rem;
    height: 5.5rem;
    border-radius: 1.125rem;
    font-family: var(--font-serif);
    font-size: 2rem;
}

.theme-swatch::after {
    content: "";
    position: absolute;
    inset-block-start: 0.75rem;
    inset-inline-end: 0.75rem;
    width: 0.625rem;
    height: 0.625rem;
    border-radius: 50%;
}

.theme-swatch-light {
    background-color: #FBFAF8;
    color: #171614;
    box-shadow: inset 0 0 0 1px rgb(23 22 20 / 0.1);
}

.theme-swatch-light::after {
    background-color: #C97248;
}

.theme-swatch-dark {
    background-color: #171614;
    color: #FBFAF8;
    box-shadow: inset 0 0 0 1px rgb(251 250 248 / 0.1);
}

.theme-swatch-dark::after {
    background-color: #F4AF60;
}

/* ==========================================================================
   Gallery
   ========================================================================== */

.gallery {
    --gallery-inset: max(var(--page-inline-start), (100% - var(--content-max)) / 2);
    padding-block: 7rem 2rem;
}

.gallery-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 2rem;
    margin-block-end: 2.5rem;
}

.gallery-controls {
    display: flex;
    gap: 0.75rem;
}

.round-button:disabled {
    opacity: 0.35;
    cursor: default;
    pointer-events: none;
}

/* Bleeds to the page edges while snapping each screen to the content column's left edge. */
.gallery-track {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: clamp(13rem, 20vw, 17.5rem);
    gap: clamp(1.25rem, 2.5vw, 2.5rem);
    padding: 1rem var(--gallery-inset) 2rem;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-padding-inline: var(--gallery-inset);
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
}

.gallery-track::-webkit-scrollbar {
    display: none;
}

.gallery-track:focus-visible {
    outline-offset: -2px;
}

.gallery-track.is-dragging {
    scroll-snap-type: none;
    cursor: grabbing;
    user-select: none;
}

.gallery-item {
    scroll-snap-align: start;
}

.gallery-item figure {
    display: grid;
    gap: 1.25rem;
}

.gallery-shot {
    display: block;
    aspect-ratio: 385 / 776;
    transition: scale 300ms var(--ease-out-expo);
}

.gallery-shot img {
    width: 100%;
    height: auto;
    pointer-events: none;
}

.gallery-item figcaption {
    color: var(--muted);
    font-size: 0.9375rem;
    text-wrap: pretty;
}

.gallery-item figcaption strong {
    display: block;
    margin-block-end: 0.25rem;
    color: var(--foreground);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 400;
}

@media (hover: hover) and (pointer: fine) {
    .gallery-track {
        cursor: grab;
    }
}

/* ==========================================================================
   Epilogue and footer
   ========================================================================== */

.epilogue {
    padding-block: 9rem 8rem;
}

.epilogue > div {
    display: grid;
    justify-items: center;
    text-align: center;
}

.epilogue .eyebrow {
    justify-content: center;
}

.epilogue-title {
    max-width: 12em;
    margin: 0 0 3rem;
    font-family: var(--font-serif);
    font-size: clamp(3rem, 1.75rem + 4.5vw, 5.75rem);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.01em;
    text-wrap: balance;
}

.epilogue-note {
    margin-block-start: 1.5rem;
    color: var(--muted);
    font-size: 0.875rem;
}

.site-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem 2rem;
    padding-block: 2.5rem 8rem;
    border-block-start: 1px solid var(--surface-border);
    color: var(--muted);
    font-size: 0.875rem;
}

.site-footer .site-title {
    color: var(--foreground);
    font-size: 1.5rem;
}

.footer-link {
    display: inline-block;
    color: inherit;
    text-underline-offset: 0.25em;
    transition: color var(--theme-transition), scale 250ms var(--ease-out-expo);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
}

.footer-links a {
    display: inline-block;
    color: inherit;
    text-decoration: none;
    text-underline-offset: 0.25em;
    transition: color var(--theme-transition), scale 250ms var(--ease-out-expo);
}

.footer-links a[aria-current="page"] {
    color: var(--foreground);
}

/* ==========================================================================
   Subpages: privacy, terms, support and roadmap
   ========================================================================== */

.page {
    padding-block: 11rem 6rem;
}

.page-header {
    max-width: 46rem;
    margin-block-end: 3.5rem;
}

.page-meta {
    margin-block-start: 1.25rem;
    color: var(--muted);
    font-size: 0.9375rem;
}

.summary-card {
    max-width: 46rem;
    margin-block-end: 3.5rem;
}

.summary-card ul {
    display: grid;
    gap: 0.75rem;
    margin-block-start: 0.75rem;
}

.summary-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.summary-card .icon {
    margin-block-start: 0.125rem;
    color: var(--accent-strong);
}

.prose {
    max-width: 46rem;
    font-size: 1.0625rem;
    line-height: 1.7;
}

.prose h2 {
    margin: 3.5rem 0 1rem;
    font-family: var(--font-serif);
    font-size: clamp(1.625rem, 1.4rem + 0.6vw, 2rem);
    font-weight: 400;
    line-height: 1.2;
    text-wrap: balance;
}

.prose > h2:first-child {
    margin-block-start: 0;
}

.prose h3 {
    margin: 2rem 0 0.5rem;
    font-size: 1.0625rem;
    font-weight: 600;
}

.prose p,
.prose ul {
    margin: 0 0 1rem;
}

.prose ul {
    padding-inline-start: 1.25rem;
    list-style: disc;
}

.prose li + li {
    margin-block-start: 0.375rem;
}

.prose li::marker {
    color: var(--accent);
}

.prose a {
    color: var(--accent-strong);
    text-underline-offset: 0.2em;
}

.support-cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    margin-block-end: 5rem;
}

.support-card {
    color: inherit;
    text-decoration: none;
    transition:
        background-color var(--theme-transition),
        border-color var(--theme-transition),
        scale 250ms var(--ease-out-expo);
}

.support-card-action {
    margin-block-start: auto;
    padding-block-start: 1.25rem;
    color: var(--accent-strong);
    font-size: 0.9375rem;
    font-weight: 600;
}

.faq {
    max-width: 46rem;
}

.faq-group + .faq-group {
    margin-block-start: 3.5rem;
}

.faq-group h2 {
    margin: 0 0 1rem;
    font-family: var(--font-serif);
    font-size: clamp(1.625rem, 1.4rem + 0.6vw, 2rem);
    font-weight: 400;
    line-height: 1.2;
}

.faq details {
    border-block-end: 1px solid var(--surface-border);
}

.faq details:first-of-type {
    border-block-start: 1px solid var(--surface-border);
}

.faq summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding-block: 1.25rem;
    font-family: var(--font-serif);
    font-size: 1.25rem;
    line-height: 1.3;
    list-style: none;
    cursor: pointer;
    transition: scale 250ms var(--ease-out-expo);
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::after {
    content: "";
    flex: none;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background-color: var(--fill);
    background-image:
        linear-gradient(var(--accent-strong), var(--accent-strong)),
        linear-gradient(var(--accent-strong), var(--accent-strong));
    background-position: center;
    background-repeat: no-repeat;
    background-size: 0.75rem 1.5px, 1.5px 0.75rem;
    transition: transform 300ms var(--reveal-easing);
}

.faq details[open] summary::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-width: 40rem;
    padding-block-end: 1.5rem;
    color: var(--muted);
}

.faq-answer p + p {
    margin-block-start: 0.75rem;
}

/* A vertical map: each version is a stop on a dashed road, and its changelog opens beside it. */
.roadmap {
    --rail: 2.5rem;
    --dot-size: 1.25rem;
    --dot-offset: 0.6rem;
    max-width: 70rem;
}

.roadmap-stop {
    position: relative;
    display: grid;
    grid-template-columns: var(--rail) 17rem minmax(0, 1fr);
    column-gap: 1.25rem;
    grid-template-rows: auto auto 1fr;
    align-items: start;
    padding-block-end: 4.5rem;
}

.roadmap-stop:last-child {
    padding-block-end: 0;
}

/* Patch releases are smaller stops, so major versions stand out along the road. */
.roadmap-stop.is-patch {
    --dot-size: 0.75rem;
    --dot-offset: 0.45rem;
}

/* The road to the next stop, from this dot's center to the next one's. */
.roadmap-stop:not(:last-child)::before {
    content: "";
    position: absolute;
    inset-block: calc(var(--dot-offset) + var(--dot-size) / 2) calc(-1 * (var(--dot-offset) + var(--dot-size) / 2));
    inset-inline-start: calc(var(--rail) / 2 - 1px);
    width: 2px;
    background-image: linear-gradient(var(--road-color, var(--track)) 50%, transparent 50%);
    background-size: 2px 10px;
}

.roadmap-stop.is-current::before {
    --road-color: var(--accent);
}

/* The road already travelled, between released versions, fades back. */
.roadmap-stop.is-released::before {
    --road-color: color-mix(in srgb, var(--accent) 40%, transparent);
}

.roadmap-stop-button {
    display: grid;
    grid-column: 1 / 3;
    grid-template-columns: subgrid;
    align-items: start;
    border-radius: 1rem;
    text-align: start;
}

/* Positioned so it paints over the road arriving from the stop above. */
.roadmap-dot {
    position: relative;
    justify-self: center;
    width: var(--dot-size);
    height: var(--dot-size);
    margin-block-start: var(--dot-offset);
    border: 2px solid var(--accent);
    border-radius: 50%;
    background-color: var(--background);
    transition:
        background-color var(--theme-transition),
        box-shadow 300ms var(--reveal-easing),
        scale 250ms var(--ease-out-expo);
}

.is-released .roadmap-dot,
.is-current .roadmap-dot {
    background-color: var(--accent);
}

.is-current .roadmap-dot {
    box-shadow: 0 0 0 calc(var(--dot-size) * 0.3) var(--accent-soft);
}

/* Patch releases stay hollow, so only major versions read as filled milestones. */
.is-patch .roadmap-dot {
    background-color: var(--background);
}

.is-later .roadmap-dot {
    border-style: dashed;
    border-color: var(--muted);
}

.roadmap-stop-button[aria-expanded="true"] .roadmap-dot {
    scale: 1.2;
}

.roadmap-stop-label {
    display: grid;
}

.roadmap-version {
    font-family: var(--font-serif);
    font-size: 2rem;
    line-height: 1.2;
    transition: color var(--theme-transition);
}

.is-patch .roadmap-version {
    font-size: 1.375rem;
}

.roadmap-stop-button[aria-expanded="true"] .roadmap-version {
    color: var(--accent-strong);
}

.roadmap-status {
    color: var(--accent-strong);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.roadmap-summary {
    grid-column: 2;
    margin-block-start: 0.75rem;
    color: var(--muted);
    text-wrap: pretty;
}

.roadmap-changelog {
    --changelog-shift: -0.75rem 0;
    position: relative;
    grid-column: 3;
    grid-row: 1 / -1;
    /* Lines the pointer's center, 2rem below the changelog's top, up with the dot's center. */
    margin-block-start: calc(var(--dot-offset) + var(--dot-size) / 2 - 2rem);
    gap: 1.5rem;
    overflow: visible;
}

.roadmap-changelog[hidden] {
    display: none;
}

/* Points from the changelog back at its dot. */
.roadmap-changelog::before {
    content: "";
    position: absolute;
    inset-block-start: 1.5rem;
    inset-inline-start: -0.5rem;
    width: 1rem;
    height: 1rem;
    border: 1px solid var(--surface-border);
    border-inline-end: 0;
    border-block-start: 0;
    background-color: var(--surface);
    rotate: 45deg;
    transition: background-color var(--theme-transition), border-color var(--theme-transition);
}

.roadmap-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    gap: 1.75rem 2.5rem;
}

.roadmap-group h3 {
    margin: 0 0 0.75rem;
    color: var(--accent-strong);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.roadmap-changes {
    display: grid;
    gap: 0.75rem;
}

.roadmap-changes li {
    position: relative;
    padding-inline-start: 1.125rem;
    color: var(--muted);
    font-size: 0.9375rem;
    text-wrap: pretty;
}

.roadmap-changes li::before {
    content: "";
    position: absolute;
    inset-block-start: 0.55em;
    inset-inline-start: 0;
    width: 0.375rem;
    height: 0.375rem;
    border-radius: 50%;
    background-color: var(--accent);
}

.roadmap-change-title {
    color: var(--foreground);
    font-weight: 600;
}

.roadmap-note {
    margin-block-start: 4rem;
    color: var(--muted);
    font-size: 1.0625rem;
}

.roadmap-note a {
    color: var(--accent-strong);
    text-underline-offset: 0.2em;
}

/* ==========================================================================
   Tour player
   ========================================================================== */

.tour-player {
    position: fixed;
    inset-block-end: var(--dock-inset);
    inset-inline-start: 50%;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    width: min(27rem, 100% - 2 * var(--page-gutter));
    padding: 0.5rem;
    border: 1px solid var(--surface-border);
    border-radius: 999px;
    background-color: var(--glass);
    box-shadow: var(--tile-shadow);
    -webkit-backdrop-filter: blur(24px) saturate(1.6);
    backdrop-filter: blur(24px) saturate(1.6);
    visibility: hidden;
    opacity: 0;
    transform: translate(-50%, 1rem);
    transition:
        opacity 300ms var(--reveal-easing),
        transform 300ms var(--reveal-easing),
        visibility 300ms,
        background-color var(--theme-transition);
}

.tour-player[hidden] {
    display: none;
}

.tour-player.is-visible {
    visibility: visible;
    opacity: 1;
    transform: translate(-50%, 0);
}

.tour-player-now {
    display: flex;
    flex: 1;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
    border-radius: 999px;
    color: inherit;
    text-decoration: none;
}

.tour-player-numeral {
    display: grid;
    flex: none;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: var(--accent-strong);
    color: var(--on-accent);
    font-family: var(--font-serif);
    font-size: 1.125rem;
    transition: background-color var(--theme-transition), scale 250ms var(--ease-out-expo);
}

.tour-player-text {
    display: grid;
    flex: 1;
    min-width: 0;
}

.tour-player-label {
    color: var(--muted);
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.tour-player-title {
    overflow: hidden;
    font-size: 0.9375rem;
    font-weight: 600;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tour-player-skip {
    display: grid;
    flex: none;
    place-items: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    color: inherit;
    transition:
        background-color var(--theme-transition),
        opacity var(--theme-transition),
        scale 250ms var(--ease-out-expo);
}

.tour-player-skip[aria-disabled="true"] {
    opacity: 0.3;
    pointer-events: none;
}

/* Sits in the title's column, which fills the rest of the chapter link: the bar starts with the
   title and runs up to the skip buttons, whatever the title's length. */
.tour-player-progress {
    position: relative;
    display: block;
    height: 2px;
    margin-block-start: 0.375rem;
    overflow: hidden;
    border-radius: 999px;
    background-color: color-mix(in srgb, var(--track) 50%, transparent);
}

.tour-player-progress::after {
    content: "";
    position: absolute;
    inset: 0;
    background-color: var(--accent);
    transform: scaleX(var(--tour-progress, 0));
    transform-origin: left;
}

/* ==========================================================================
   Hover states
   ========================================================================== */

@media (hover: hover) {
    .theme-option:hover {
        color: var(--foreground);
        scale: 1.12;
    }

    .app-store-button:hover,
    .tour-button:hover {
        scale: 1.04;
    }

    .contents-list a:hover {
        scale: 1.02;
    }

    .contents-list a:hover .contents-name {
        color: var(--accent-strong);
    }

    .round-button:hover,
    .tour-player-skip:hover {
        background-color: var(--accent-soft);
    }

    .cover-button:hover {
        transform: rotate(-2deg) scale(1.03);
    }

    .scroll-cue:hover {
        color: var(--foreground);
    }

    .footer-links a:hover {
        color: var(--foreground);
        text-decoration: underline;
    }

    .footer-links a:hover,
    .footer-link:hover {
        scale: 1.06;
    }

    .support-card:hover {
        border-color: color-mix(in srgb, var(--accent) 40%, transparent);
        scale: 1.03;
    }

    .header-links a:hover {
        border-color: color-mix(in srgb, var(--accent) 40%, transparent);
        scale: 1.04;
    }

    .faq summary:hover {
        scale: 1.02;
    }

    .roadmap-stop-button:hover .roadmap-version {
        color: var(--accent-strong);
    }

    .roadmap-stop-button:hover .roadmap-dot {
        scale: 1.35;
    }

    /* Hover only: tiles hold sliders and switches, so shrinking them on press would fight a drag. */
    .bento .tile:hover {
        scale: 1.02;
    }

    /* Hover only, as screens are dragged rather than pressed. */
    .gallery-track:not(.is-dragging) .gallery-shot:hover {
        scale: 1.03;
    }

    .site-title:hover {
        scale: 1.03;
    }

    .round-button:hover,
    .tour-player-skip:hover,
    .tour-player-now:hover .tour-player-numeral {
        scale: 1.08;
    }

    .segmented input:not(:checked) + label:hover {
        scale: 1.04;
    }

    .scroll-cue:hover {
        scale: 1.06;
    }
}

/* Comes after the hover rule so a press reads as a press even while hovered. */
.app-store-button:active,
.tour-button:active {
    scale: 0.97;
}

.theme-option:active {
    scale: 0.92;
}

.header-links a:active,
.footer-links a:active,
.footer-link:active {
    scale: 0.96;
}

.contents-list a:active {
    scale: 0.99;
}

.support-card:active {
    scale: 0.98;
}

.faq summary:active {
    scale: 0.99;
}

.roadmap-stop-button:active .roadmap-dot {
    scale: 0.9;
}

.site-title:active {
    scale: 0.98;
}

.round-button:active,
.tour-player-skip:active,
.tour-player-now:active .tour-player-numeral {
    scale: 0.92;
}

.segmented label:active,
.scroll-cue:active {
    scale: 0.96;
}

.cover-button:active {
    transform: scale(0.97);
}

.theme-option[aria-pressed="true"] {
    color: var(--accent);
}

/* ==========================================================================
   Motion
   ========================================================================== */

@keyframes caret-blink {
    50% {
        opacity: 0;
    }
}

@keyframes travel {
    0% {
        inset-inline-start: 0;
        opacity: 0;
    }

    20%,
    80% {
        opacity: 1;
    }

    100% {
        inset-inline-start: calc(100% - 0.5rem);
        opacity: 0;
    }
}

@keyframes changelog-in {
    from {
        opacity: 0;
        translate: var(--changelog-shift);
    }
}

@keyframes reveal {
    from {
        opacity: 0;
        transform: translateY(2.5rem) scale(0.98);
    }
}

@keyframes back-device-drift {
    to {
        transform: translate(8%, -50%) rotate(6deg);
    }
}

@keyframes front-device-drift {
    to {
        transform: translateY(-5%);
    }
}

@keyframes cue-in {
    from {
        opacity: 0;
        translate: 0 -0.375rem;
    }
}

@keyframes cue-out {
    to {
        opacity: 0;
    }
}

@keyframes cue-travel {
    0% {
        inset-block-start: 0;
        opacity: 0;
    }

    25%,
    75% {
        opacity: 1;
    }

    100% {
        inset-block-start: calc(100% - 5px);
        opacity: 0;
    }
}

/* The scroll drift animates the devices' transform while the pointer tilt shifts their translate
   and transforms their container, so the two compose instead of overriding each other. */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }

    .scroll-cue > * {
        animation: cue-in 1400ms cubic-bezier(0.4, 0, 0.2, 1) 900ms backwards;
    }

    .roadmap-changelog {
        animation: changelog-in 400ms var(--reveal-easing);
    }

    @supports (animation-timeline: view()) {
        .reveal {
            animation: reveal linear both;
            animation-timeline: view();
            animation-range: entry 0% entry 70%;
        }

        .device-front {
            animation: front-device-drift linear both;
            animation-timeline: scroll(root);
            animation-range: 0 100vh;
        }

        .device-back {
            animation: back-device-drift linear both;
            animation-timeline: scroll(root);
            animation-range: 0 100vh;
        }

        .scroll-cue {
            animation: cue-out linear both;
            animation-timeline: scroll(root);
            animation-range: 0 25vh;
        }
    }

    ::view-transition-old(root),
    ::view-transition-new(root) {
        animation: none;
        mix-blend-mode: normal;
    }

    .is-switching-theme,
    .is-switching-theme *,
    .is-switching-theme *::before,
    .is-switching-theme *::after {
        transition: none !important;
    }

    /* Named only while switching versions, so the theme switch still reveals the page as one.
       roadmap.js names each stop, however many there are. */
    .is-switching-version .roadmap-note {
        view-transition-name: roadmap-note;
    }

    .is-switching-version .site-footer {
        view-transition-name: roadmap-footer;
    }

    .is-switching-version::view-transition-group(*),
    .is-switching-version::view-transition-old(*),
    .is-switching-version::view-transition-new(*) {
        animation-duration: 450ms;
        animation-timing-function: var(--reveal-easing);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 60rem) {
    :root {
        --page-inline-start: var(--page-gutter);
        --page-inline-end: var(--page-gutter);
        --dock-inset: var(--page-gutter);
    }

    /* The theme toggle leaves the bottom edge to the tour player and joins the header as one round
       button, beside the navigation, that switches to the other theme. */
    .site-header {
        justify-content: flex-start;
        gap: 0.375rem;
        padding-block: var(--page-gutter);
    }

    /* Eases down on narrow phones so the wordmark, toggle and navigation share one row. */
    .site-header .site-title {
        margin-inline-end: auto;
        font-size: clamp(1.5rem, 7.5vw, 2rem);
    }

    .site-header nav {
        order: 1;
    }

    .theme-toggle {
        position: static;
        padding: 0;
        background-color: transparent;
    }

    .theme-toggle::before {
        display: none;
    }

    .theme-option {
        width: 2.75rem;
        height: 2.75rem;
        border: 1px solid var(--surface-border);
        background-color: var(--fill);
        color: var(--foreground);
        transition:
            background-color var(--theme-transition),
            border-color var(--theme-transition),
            color var(--theme-transition),
            scale 250ms var(--ease-out-expo);
    }

    .theme-option svg {
        width: 1.25rem;
        height: 1.25rem;
    }

    .theme-option[aria-pressed="true"] {
        display: none;
    }

    .scroll-cue {
        display: none;
    }

    .page {
        padding-block: 7rem 4rem;
    }

    .support-cards {
        grid-template-columns: minmax(0, 1fr);
    }

    .roadmap-stop {
        grid-template-columns: var(--rail) minmax(0, 1fr);
        column-gap: 0.75rem;
        padding-block-end: 3.5rem;
    }

    .roadmap-summary {
        grid-column: 2;
    }

    .roadmap-changelog {
        --changelog-shift: 0 -0.75rem;
        grid-column: 2;
        grid-row: auto;
        margin-block-start: 1.5rem;
    }

    .roadmap-changelog::before {
        inset-block-start: -0.5rem;
        inset-inline-start: 1.5rem;
        rotate: 135deg;
    }

    .gallery {
        padding-block-start: 4.5rem;
    }

    .gallery-track {
        grid-auto-columns: min(68vw, 16rem);
    }

    .hero {
        grid-template-columns: minmax(0, 1fr);
        row-gap: 4rem;
        padding-block: 6rem 7.5rem;
    }

    .hero-copy {
        justify-items: center;
        text-align: center;
    }

    .hero-title {
        font-size: min(4.6rem, 11vw);
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-devices {
        --hero-devices-shift: 0rem;
        justify-self: center;
        width: min(20.5rem * var(--device-group-span), 85%);
    }

    .tour-intro,
    .chapter {
        grid-template-columns: minmax(0, 1fr);
    }

    .tour-intro {
        padding-block: 6rem 3rem;
    }

    .chapter {
        padding-block: 4.5rem;
    }

    .bento-three {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .tour-player {
        inset-inline: var(--page-gutter);
        width: auto;
        transform: translateY(1rem);
    }

    .tour-player.is-visible {
        transform: none;
    }

    .tour-player-label {
        display: none;
    }
}

@media (max-width: 40rem) {
    .bento,
    .bento-three {
        grid-template-columns: minmax(0, 1fr);
    }

    .bento-three .widget-tile {
        grid-column: auto;
    }

    .tile {
        padding: 1.5rem;
        border-radius: 1.5rem;
    }

    .tile-device {
        grid-row: auto;
        min-height: 26rem;
        padding: 0;
    }

    .contents-list a {
        grid-template-columns: 2.5rem minmax(0, 1fr) auto;
        font-size: 1.1875rem;
    }

    .contents-leader {
        display: none;
    }

    .specs > div {
        flex-direction: column;
        gap: 0.125rem;
    }

    .specs dd {
        text-align: start;
    }

    .search-results {
        grid-template-columns: minmax(0, 1fr);
    }

    .speed-demo {
        grid-template-columns: minmax(0, 1fr);
        grid-template-areas:
            "heading"
            "readout"
            "control";
    }

    .speed-readout {
        text-align: start;
    }

    .import-demo,
    .import-flow,
    .sync-story,
    .edit-demo {
        grid-template-columns: minmax(0, 1fr);
    }

    .import-connector {
        justify-self: center;
        width: 2px;
        height: 2.5rem;
        margin: 0.75rem 0;
        background-size: 2px 6px;
    }

    .import-connector::after {
        display: none;
    }

    .sync-path {
        justify-self: center;
        transform: rotate(90deg);
    }

    .sync-path .icon {
        transform: rotate(-90deg);
    }

    .widgets {
        padding: 1rem;
    }

    .theme-tile {
        flex-direction: column;
        align-items: flex-start;
    }

    .theme-swatch {
        width: 6.5rem;
        height: 4.5rem;
    }
}