:root {
    color-scheme: light;
    --reader-bg: #f1f0eb;
    --reader-page: #fffefb;
    --reader-text: #24231f;
    --reader-muted: #6c6961;
    --reader-border: #d9d5ca;
    --reader-accent: #315b8a;
    --reader-accent-soft: #e8eef5;
    --reader-shadow: 0 8px 30px rgb(46 43 36 / 9%);
    --reader-font-size: 20px;
    --reader-line-height: 1.65;
    --reader-page-gap: 48px;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
}

button,
select,
input {
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.reader-page {
    min-width: 20rem;
    background: var(--reader-bg);
    color: var(--reader-text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    overflow: hidden;
}

.reader-page[data-theme="sepia"] {
    color-scheme: light;
    --reader-bg: #e9e1cf;
    --reader-page: #f8f0de;
    --reader-text: #3b3126;
    --reader-muted: #756655;
    --reader-border: #cfbea1;
    --reader-accent: #875b32;
    --reader-accent-soft: #ede0c8;
}

.reader-page[data-theme="dark"] {
    color-scheme: dark;
    --reader-bg: #14171b;
    --reader-page: #1d2127;
    --reader-text: #e8e5dd;
    --reader-muted: #aaa8a1;
    --reader-border: #383d45;
    --reader-accent: #9bbceb;
    --reader-accent-soft: #273448;
    --reader-shadow: 0 8px 30px rgb(0 0 0 / 22%);
}

.reader-page[data-font="serif"] .reader-content {
    font-family: Georgia, "Times New Roman", serif;
}

.reader-page[data-font="sans"] .reader-content {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.reader-app {
    display: grid;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    grid-template-rows: auto minmax(0, 1fr) auto;
    background: var(--reader-page);
}

.skip-link {
    position: fixed;
    z-index: 20;
    top: 0.5rem;
    left: 0.5rem;
    border-radius: 0.35rem;
    background: var(--reader-text);
    color: var(--reader-page);
    padding: 0.6rem 0.8rem;
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.reader-header {
    z-index: 3;
    display: grid;
    min-height: 4.25rem;
    grid-template-columns: minmax(8rem, 1fr) minmax(0, 2fr) minmax(8rem, 1fr);
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid var(--reader-border);
    background: var(--reader-page);
    padding: max(0.65rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) 0.65rem max(1rem, env(safe-area-inset-left));
}

.reader-back {
    display: inline-flex;
    min-width: 0;
    align-items: center;
    gap: 0.5rem;
    color: var(--reader-muted);
    font-size: 0.88rem;
    font-weight: 700;
    text-decoration: none;
}

.reader-back:hover,
.reader-back:focus-visible {
    color: var(--reader-accent);
}

.reader-back__text {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reader-heading {
    min-width: 0;
    text-align: center;
}

.reader-heading span {
    display: block;
    color: var(--reader-muted);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.reader-heading h1 {
    margin: 0.15rem 0 0;
    overflow: hidden;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1rem, 2.2vw, 1.3rem);
    font-weight: 600;
    line-height: 1.15;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reader-icon-button {
    width: 2.7rem;
    height: 2.7rem;
    justify-self: end;
    border: 1px solid var(--reader-border);
    border-radius: 50%;
    background: var(--reader-page);
    color: var(--reader-text);
    cursor: pointer;
    font-family: Georgia, "Times New Roman", serif;
    font-weight: 700;
}

.reader-icon-button:hover,
.reader-icon-button:focus-visible,
.reader-icon-button[aria-expanded="true"] {
    border-color: var(--reader-accent);
    background: var(--reader-accent-soft);
    color: var(--reader-accent);
}

.reader-settings {
    position: fixed;
    z-index: 10;
    top: 4.75rem;
    right: max(1rem, env(safe-area-inset-right));
    width: min(22rem, calc(100% - 2rem));
    max-height: calc(100vh - 5.75rem);
    max-height: calc(100dvh - 5.75rem);
    border: 1px solid var(--reader-border);
    border-radius: 0.75rem;
    background: var(--reader-page);
    padding: 1.2rem;
    overflow-y: auto;
    box-shadow: 0 18px 55px rgb(0 0 0 / 18%);
}

.reader-settings[hidden] {
    display: none;
}

.reader-settings__heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.reader-settings__heading h2 {
    margin: 0;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1.25rem;
}

.reader-settings__heading button {
    border: 0;
    background: transparent;
    color: var(--reader-muted);
    cursor: pointer;
    font-size: 1.6rem;
}

.reader-settings label {
    display: grid;
    gap: 0.45rem;
    color: var(--reader-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.reader-settings label + label {
    margin-top: 1rem;
}

.reader-settings label > span {
    display: flex;
    justify-content: space-between;
}

.reader-settings select {
    width: 100%;
    min-height: 2.55rem;
    border: 1px solid var(--reader-border);
    border-radius: 0.4rem;
    background: var(--reader-page);
    color: var(--reader-text);
    padding: 0.45rem 0.6rem;
}

.reader-settings input[type="range"] {
    width: 100%;
    accent-color: var(--reader-accent);
}

.reader-settings__account {
    display: grid;
    gap: 0.45rem;
    margin-top: 1.2rem;
    border-top: 1px solid var(--reader-border);
    padding-top: 1rem;
    color: var(--reader-muted);
    font-size: 0.78rem;
    line-height: 1.45;
}

.reader-settings__account strong {
    color: var(--reader-text);
}

.reader-settings__account a {
    color: var(--reader-accent);
    font-weight: 800;
}

.reader-settings__rating {
    display: grid;
    gap: 0.45rem;
    margin-top: 1.1rem;
    border-top: 1px solid var(--reader-border);
    padding-top: 1rem;
}

.reader-settings__rating > strong {
    color: var(--reader-text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1rem;
}

.reader-rating-summary,
.reader-rating-status {
    color: var(--reader-muted);
    font-size: 0.78rem;
    line-height: 1.45;
}

.reader-rating-status a {
    color: var(--reader-accent);
    font-weight: 800;
}

.reader-rating-stars {
    display: flex;
    gap: 0.15rem;
    margin-block: 0.15rem;
}

.reader-rating-star {
    width: 2.35rem;
    height: 2.35rem;
    border: 1px solid var(--reader-border);
    border-radius: 0.4rem;
    background: var(--reader-page);
    color: var(--reader-border);
    cursor: pointer;
    font-size: 1.35rem;
    line-height: 1;
}

.reader-rating-star:hover,
.reader-rating-star:focus-visible {
    border-color: var(--reader-accent);
    color: var(--reader-accent);
}

.reader-rating-star.is-filled {
    border-color: #b88726;
    background: color-mix(in srgb, #d9a83e 14%, var(--reader-page));
    color: #c58b18;
}

.reader-rating-star:disabled {
    cursor: wait;
    opacity: 0.6;
}

.reader-settings__discussion {
    display: grid;
    gap: 0.4rem;
    margin-top: 1.1rem;
    border-top: 1px solid var(--reader-border);
    padding-top: 1rem;
    font-size: 0.82rem;
}

.reader-settings__discussion strong {
    color: var(--reader-text);
}

.reader-settings__discussion a {
    color: var(--reader-accent);
    font-weight: 800;
}

.reader-main {
    min-height: 0;
    background: var(--reader-page);
    padding-inline: max(clamp(1rem, 5vw, 4rem), env(safe-area-inset-left));
}

.reader-viewport {
    width: min(48rem, 100%);
    height: 100%;
    margin-inline: auto;
    overflow: auto;
    scrollbar-width: none;
}

.reader-viewport::-webkit-scrollbar {
    display: none;
}

.reader-ready .reader-viewport {
    overflow: hidden;
}

.reader-content {
    min-height: 100%;
    color: var(--reader-text);
    font-size: var(--reader-font-size);
    line-height: var(--reader-line-height);
    overflow-wrap: break-word;
    padding-block: clamp(1.25rem, 4vh, 2.5rem);
}

.reader-ready .reader-content {
    height: 100%;
    column-fill: auto;
    column-gap: var(--reader-page-gap);
    column-width: var(--reader-page-width);
}

.reader-content > :first-child {
    margin-top: 0;
}

.reader-content > :last-child {
    margin-bottom: 0;
}

.reader-content p,
.reader-content li {
    orphans: 3;
    widows: 3;
}

.reader-content p {
    margin: 0 0 1.15em;
}

.reader-content h2,
.reader-content h3,
.reader-content h4 {
    break-after: avoid;
    margin: 1.6em 0 0.6em;
    font-family: Georgia, "Times New Roman", serif;
    line-height: 1.2;
}

.reader-content h2 {
    font-size: 1.55em;
}

.reader-content h3 {
    font-size: 1.28em;
}

.reader-content h4 {
    font-size: 1.08em;
}

.reader-content blockquote,
.reader-content pre {
    break-inside: avoid;
}

.reader-content blockquote {
    margin: 1.4em 0;
    border-left: 0.2rem solid var(--reader-accent);
    color: var(--reader-muted);
    padding-left: 1em;
}

.reader-content ul,
.reader-content ol {
    margin: 0 0 1.2em;
    padding-left: 1.6em;
}

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

.reader-content pre {
    border: 1px solid var(--reader-border);
    border-radius: 0.4rem;
    background: var(--reader-bg);
    font-size: 0.78em;
    overflow: auto;
    padding: 0.85em;
    white-space: pre-wrap;
}

.reader-content code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.reader-content a {
    color: var(--reader-accent);
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.14em;
}

.reader-content hr {
    width: 30%;
    margin: 2em auto;
    border: 0;
    border-top: 1px solid var(--reader-border);
}

.reader-footer {
    z-index: 3;
    border-top: 1px solid var(--reader-border);
    background: var(--reader-page);
    padding: 0 max(1rem, env(safe-area-inset-right)) max(0.65rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
}

.reader-progress {
    height: 0.2rem;
    margin-inline: -1rem;
    background: var(--reader-border);
}

.reader-progress span {
    display: block;
    width: 0;
    height: 100%;
    background: var(--reader-accent);
    transition: width 180ms ease;
}

.reader-controls {
    display: grid;
    max-width: 48rem;
    min-height: 3.7rem;
    grid-template-columns: 1fr minmax(8rem, auto) 1fr;
    align-items: center;
    gap: 1rem;
    margin-inline: auto;
}

.reader-page-button {
    display: inline-flex;
    min-height: 2.7rem;
    align-items: center;
    gap: 0.5rem;
    border: 0;
    background: transparent;
    color: var(--reader-accent);
    cursor: pointer;
    font-weight: 800;
}

.reader-page-button:last-child {
    justify-self: end;
}

.reader-page-button:disabled {
    color: var(--reader-muted);
    cursor: default;
    opacity: 0.38;
}

.reader-page-status {
    color: var(--reader-muted);
    font-size: 0.78rem;
    text-align: center;
}

.reader-page-status button {
    display: block;
    margin: 0.15rem auto 0;
    border: 0;
    background: transparent;
    color: var(--reader-accent);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 800;
    text-decoration: underline;
    text-underline-offset: 0.15rem;
}

.reader-complete-label {
    display: block;
    margin-top: 0.15rem;
    color: var(--reader-accent);
    font-size: 0.75rem;
    font-weight: 800;
}

.reader-chapter-nav {
    display: grid;
    max-width: 68rem;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-inline: auto;
    border-top: 1px solid var(--reader-border);
    padding-top: 0.6rem;
}

.reader-chapter-nav a {
    min-width: 0;
    color: var(--reader-text);
    text-decoration: none;
}

.reader-chapter-nav a:hover strong,
.reader-chapter-nav a:focus-visible strong {
    color: var(--reader-accent);
    text-decoration: underline;
    text-underline-offset: 0.15rem;
}

.reader-chapter-nav span,
.reader-chapter-nav strong {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reader-chapter-nav span {
    color: var(--reader-muted);
    font-size: 0.67rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.reader-chapter-nav strong {
    margin-top: 0.08rem;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 0.88rem;
}

.reader-chapter-nav__next {
    text-align: right;
}

.reader-noscript {
    position: fixed;
    z-index: 30;
    right: 1rem;
    bottom: 1rem;
    left: 1rem;
    border: 1px solid var(--reader-border);
    border-radius: 0.5rem;
    background: var(--reader-page);
    color: var(--reader-text);
    padding: 0.75rem;
    box-shadow: var(--reader-shadow);
    font-size: 0.85rem;
    text-align: center;
}

.reader-flash {
    position: fixed;
    z-index: 25;
    right: 1rem;
    bottom: max(1rem, env(safe-area-inset-bottom));
    max-width: min(28rem, calc(100% - 2rem));
    border: 1px solid var(--reader-border);
    border-radius: 0.5rem;
    background: var(--reader-page);
    color: var(--reader-text);
    padding: 0.75rem 0.9rem;
    box-shadow: 0 12px 40px rgb(0 0 0 / 18%);
    font-size: 0.82rem;
    line-height: 1.45;
}

.reader-flash--success {
    border-color: #71a88e;
}

.reader-flash--error {
    border-color: #c06b64;
}

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

:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--reader-accent) 55%, transparent);
    outline-offset: 3px;
}

@media (max-width: 42rem) {
    :root {
        --reader-page-gap: 24px;
    }

    .reader-header {
        min-height: 3.75rem;
        grid-template-columns: 2.7rem minmax(0, 1fr) 2.7rem;
        gap: 0.5rem;
        padding-block: max(0.45rem, env(safe-area-inset-top)) 0.45rem;
    }

    .reader-back {
        justify-content: center;
        font-size: 1.15rem;
    }

    .reader-back__text {
        display: none;
    }

    .reader-main {
        padding-inline: max(1.1rem, env(safe-area-inset-left));
    }

    .reader-content {
        padding-block: 1.2rem;
    }

    .reader-controls {
        min-height: 3.3rem;
        grid-template-columns: 1fr auto 1fr;
        gap: 0.3rem;
    }

    .reader-page-button span:not([aria-hidden="true"]) {
        display: none;
    }

    .reader-page-button {
        min-width: 2.7rem;
        justify-content: center;
        font-size: 1.15rem;
    }

    .reader-page-button:first-child {
        justify-self: start;
    }

    .reader-chapter-nav {
        gap: 1rem;
        padding-top: 0.45rem;
    }

    .reader-chapter-nav strong {
        font-size: 0.78rem;
    }
}

@media (max-height: 38rem) {
    .reader-chapter-nav {
        display: none;
    }

    .reader-content {
        padding-block: 0.85rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .reader-progress span {
        transition: none;
    }
}