/* story info page v2: isolated namespace si- */
:root {
    color-scheme: light dark;
    --si-bg: #f4f6f8;
    --si-panel: #ffffff;
    --si-text: #1f2a34;
    --si-muted: #6d7b88;
    --si-line: #dde4ea;
    --si-accent: #436e89;
    --si-accent-strong: #355a72;
    --si-accent-soft: #eaf2f8;
    --si-catalog-bg: #f7fafd;
    --si-catalog-head-bg: #edf4f9;
    --si-preview-head-bg: #edf4f9;
    --si-preview-body-bg: #fbfdff;
    --si-intro-soft: #f7fafc;
    --si-header-bg: rgba(255, 255, 255, 0.95);
    --si-shadow: 0 8px 22px rgba(20, 37, 50, 0.08);
}

[data-theme="dark"] {
    --si-bg: #111922;
    --si-panel: #182330;
    --si-text: #e7edf3;
    --si-muted: #98a9b7;
    --si-line: #2b3948;
    --si-accent: #83adc4;
    --si-accent-strong: #9dc4d8;
    --si-accent-soft: #1e2d3a;
    --si-catalog-bg: #1a2936;
    --si-catalog-head-bg: #213444;
    --si-preview-head-bg: #203442;
    --si-preview-body-bg: #16222d;
    --si-intro-soft: #1a2733;
    --si-header-bg: rgba(24, 35, 48, 0.94);
    --si-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--si-bg);
    color: var(--si-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

a { color: inherit; text-decoration: none; }

.si-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding-left: 16px;
    padding-right: 16px;
}

.si-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--si-header-bg);
    border-bottom: 1px solid var(--si-line);
    backdrop-filter: blur(10px);
}

.si-header-inner {
    min-height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.si-brand {
    display: flex;
    flex-direction: column;
}

.si-brand strong {
    font-size: 22px;
    line-height: 1.2;
}

.si-brand span {
    margin-top: 2px;
    font-size: 12px;
    color: var(--si-muted);
}

.si-header-actions {
    display: inline-flex;
    gap: 8px;
}

.si-btn {
    min-height: 34px;
    border-radius: 999px;
    border: 1px solid transparent;
    padding: 0 13px;
    font-size: 13px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    text-align: center;
}

.si-btn-light {
    background: var(--si-panel);
    border-color: var(--si-line);
    color: var(--si-text);
}

.si-btn-light:hover,
.si-btn-primary:hover,
.si-btn-hero:hover {
    border-color: var(--si-accent);
    color: var(--si-accent);
}

.si-btn-primary {
    background: linear-gradient(180deg, var(--si-accent), var(--si-accent-strong));
    border-color: var(--si-accent-strong);
    color: #fff;
}

.si-btn-primary:hover {
    background: linear-gradient(180deg, var(--si-accent-strong), var(--si-accent));
    border-color: var(--si-accent-strong);
    color: #fff;
}

#open-catalog-topnav.si-btn-light {
    background: var(--si-accent-soft);
    border-color: color-mix(in srgb, var(--si-accent) 35%, var(--si-line));
    color: var(--si-accent);
}

#open-catalog-topnav.si-btn-light:hover {
    background: color-mix(in srgb, var(--si-accent-soft) 70%, var(--si-panel));
    border-color: var(--si-accent);
    color: var(--si-accent);
}

.si-btn-hero {
    background: var(--si-accent-soft);
    border-color: rgba(67, 110, 137, 0.35);
    color: var(--si-accent);
}

.si-main {
    padding-top: 14px;
    padding-bottom: 24px;
}

.si-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 12px;
}

.si-left,
.si-right { min-width: 0; }

.si-left {
    display: grid;
    gap: 14px;
    align-content: start;
}

.si-right {
    position: sticky;
    top: 66px;
    align-self: start;
}

.si-book-card,
.si-content-card,
.si-comments-card,
.si-side-card {
    border: 1px solid var(--si-line);
    border-radius: 10px;
    background: var(--si-panel);
    box-shadow: var(--si-shadow);
}

.si-content-card,
.si-comments-card,
.si-side-card + .si-side-card {
    margin-top: 12px;
}

.si-content-card {
    background: var(--si-preview-body-bg);
}

.si-book-head {
    padding: 12px;
    border-bottom: 1px solid var(--si-line);
    background: linear-gradient(180deg, var(--si-accent-soft), var(--si-panel));
}

.si-book-head h1 {
    margin: 0;
    font-size: 30px;
    line-height: 1.35;
}

.si-book-meta {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--si-muted);
}

.si-book-meta > span {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    line-height: 1;
}

.si-book-meta .tag {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 8px;
    border-radius: 999px;
    border: 1px solid var(--si-line);
    background: var(--si-panel);
    color: var(--si-accent);
    font-size: 12px;
}

.si-book-intro {
    padding: 12px;
    color: var(--si-text);
    line-height: 1.8;
    background: linear-gradient(180deg, var(--si-panel), var(--si-intro-soft));
}

.si-book-intro-content p {
    margin: 0 0 0.8em;
}

.si-book-intro-content {
    position: relative;
}

.si-book-intro-content.is-collapsed {
    max-height: 210px;
    overflow: hidden;
}

.si-book-intro-content.is-collapsed::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 72px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0), var(--si-panel));
}

.si-intro-toggle {
    margin-top: 6px;
    margin-left: auto;
    display: block;
    width: fit-content;
}

.si-inline-catalog {
    margin-top: 0;
    border: 1px solid var(--si-line);
    border-radius: 12px;
    background: var(--si-catalog-bg);
    box-shadow: var(--si-shadow);
    overflow: hidden;
    position: relative;
}

.si-book-card {
    margin-bottom: 0;
    overflow: hidden;
}

.si-left .si-content-card,
.si-left .si-comments-card {
    margin-top: 0;
}

.si-inline-catalog-head {
    padding: 10px 12px;
    background: var(--si-catalog-head-bg);
    border-bottom: 1px solid var(--si-line);
}

.si-inline-catalog-head h3 {
    margin: 0;
    font-size: 17px;
}

.si-book-actions {
    padding: 0 12px 12px;
    display: inline-flex;
    flex-wrap: wrap;
    gap: 8px;
}

.si-section-head {
    padding: 10px 12px;
    border-bottom: 1px solid var(--si-line);
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
    background: var(--si-preview-head-bg);
}

.si-section-head h2 {
    margin: 0;
    font-size: 18px;
}

.si-section-head span,
.si-section-head a {
    font-size: 13px;
    color: var(--si-muted);
}

.si-reader-content {
    padding: 14px 12px;
    font-size: 18px;
    line-height: 1.9;
    letter-spacing: 0.2px;
    word-break: break-word;
    background: var(--si-preview-body-bg);
}

.si-reader-content p {
    margin: 0 0 1.1em;
    text-indent: 2em;
}

.si-nav {
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.si-nav-top {
    border-bottom: 1px solid var(--si-line);
}

.si-nav-btn {
    min-height: 42px;
    border: 1px solid var(--si-line);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    font-size: 14px;
    background: var(--si-panel);
    color: var(--si-text);
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.si-nav-btn:hover {
    border-color: var(--si-accent);
    color: var(--si-accent);
}

.si-nav-btn.is-book-nav .book-nav-text {
    white-space: normal;
    text-align: center;
    line-height: 1.35;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.si-comments {
    list-style: none;
    margin: 0;
    padding: 10px 12px;
    display: grid;
    gap: 10px;
}

.si-comments li {
    border: 1px solid var(--si-line);
    border-radius: 8px;
    padding: 9px 10px;
}

.si-comment-top {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: baseline;
}

.si-comment-top strong { font-size: 13px; }

.si-comment-top span {
    font-size: 12px;
    color: var(--si-muted);
}

.si-comment-body {
    margin-top: 6px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--si-text);
    word-break: break-word;
}

.si-side-head {
    padding: 10px 12px;
    border-bottom: 1px solid var(--si-line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    background: var(--si-accent-soft);
}

.si-side-head h3 {
    margin: 0;
    font-size: 17px;
}

.si-link-btn {
    border: 1px solid var(--si-line);
    background: var(--si-panel);
    color: var(--si-accent);
    border-radius: 8px;
    min-height: 30px;
    padding: 0 10px;
    font-size: 12px;
    cursor: pointer;
}

.si-link-btn:hover {
    border-color: var(--si-accent);
}

.si-side-list {
    padding: 10px 12px 12px;
    display: grid;
    gap: 7px;
}

.si-inline-catalog-more {
    padding: 0 12px 12px;
    text-align: center;
}

.si-inline-catalog-more .si-link-btn {
    min-height: 32px;
    padding: 0 14px;
    background: linear-gradient(180deg, var(--si-accent), var(--si-accent-strong));
    border-color: var(--si-accent-strong);
    color: #fff;
}

.si-inline-catalog-more .si-link-btn:hover {
    background: linear-gradient(180deg, var(--si-accent-strong), var(--si-accent));
    border-color: var(--si-accent-strong);
    color: #fff;
}

.si-side-list a {
    border: 1px solid var(--si-line);
    border-radius: 8px;
    min-height: 34px;
    padding: 7px 9px;
    font-size: 13px;
    display: flex;
    align-items: center;
    background: var(--si-panel);
}

.si-side-list a:hover,
.si-side-list a.is-current {
    border-color: var(--si-accent);
    color: var(--si-accent);
}

.si-side-list a.is-current {
    border-color: var(--si-line);
    color: var(--si-text);
}

.si-side-rank {
    list-style: none;
    margin: 0;
    padding: 10px 12px;
    display: grid;
    gap: 7px;
}

.si-side-rank li a {
    min-height: 36px;
    padding: 6px 8px;
    border: 1px solid var(--si-line);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.si-rank-no {
    width: 20px;
    height: 20px;
    border-radius: 999px;
    background: var(--si-accent-soft);
    color: var(--si-accent);
    font-size: 11px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
}

.si-rank-title {
    font-size: 13px;
    line-height: 1.45;
    display: -webkit-box;
    line-clamp: 1;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.si-empty-inline {
    color: var(--si-muted);
    font-size: 13px;
    text-align: center;
    padding: 18px 8px;
}

.catalog-modal,
.search-modal {
    position: fixed;
    inset: 0;
    background: rgba(5, 12, 18, 0.55);
    z-index: 2147483646;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.catalog-modal.is-open,
.search-modal.is-open {
    display: flex;
}

.catalog-panel {
    width: min(760px, 100%);
    max-height: 82vh;
    background: var(--si-panel);
    border: 1px solid var(--si-line);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.catalog-head {
    min-height: 52px;
    padding: 0 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--si-line);
}

.catalog-close {
    border: 1px solid var(--si-line);
    background: var(--si-panel);
    color: var(--si-text);
    border-radius: 8px;
    padding: 6px 10px;
    cursor: pointer;
}

.catalog-list-wrap {
    overflow: auto;
    padding: 10px;
}

.catalog-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 8px;
}

.catalog-list a {
    display: block;
    border: 1px solid var(--si-line);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 14px;
}

.catalog-list a:hover,
.catalog-list a.is-current {
    border-color: var(--si-accent);
    color: var(--si-accent);
}

.catalog-list a.is-current {
    border-color: var(--si-line);
    color: var(--si-text);
}

.catalog-empty {
    text-align: center;
    color: var(--si-muted);
    padding: 30px 12px;
}

.search-panel {
    width: min(640px, 100%);
    background: var(--si-panel);
    border: 1px solid var(--si-line);
    border-radius: 12px;
    padding: 14px;
}

.search-form {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
}

.search-input {
    width: 100%;
    min-height: 40px;
    border: 1px solid var(--si-line);
    border-radius: 10px;
    padding: 0 12px;
    color: var(--si-text);
    background: var(--si-panel);
}

.search-submit,
.search-close {
    min-height: 40px;
    border: 1px solid var(--si-line);
    border-radius: 10px;
    padding: 0 14px;
    background: var(--si-panel);
    color: var(--si-text);
    cursor: pointer;
}

.search-submit {
    border-color: var(--si-accent);
    background: linear-gradient(180deg, var(--si-accent), var(--si-accent-strong));
    color: #fff;
}

.si-footer {
    margin-top: 16px;
    border-top: 1px solid var(--si-line);
    background: var(--si-panel);
}

.si-footer-inner {
    padding-top: 16px;
    padding-bottom: 16px;
    text-align: center;
}

.si-footer-links {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    color: var(--si-muted);
    font-size: 13px;
}

.si-footer-links a:hover { color: var(--si-accent); }

.si-copy {
    margin: 10px 0 0;
    font-size: 12px;
    color: var(--si-muted);
}

@media (max-width: 1024px) {
    .si-grid { grid-template-columns: 1fr; }
    .si-right { position: static; }
}

@media (max-width: 900px) {
    .si-main { padding-top: 10px; padding-bottom: 12px; }
    .si-wrap { padding-left: 0; padding-right: 0; }
    .si-header .si-wrap { padding-left: 12px; padding-right: 12px; }
    .si-brand span { display: none; }
    .si-brand strong { font-size: 19px; }
    .si-btn-light { min-height: 32px; padding: 0 10px; font-size: 12px; }

    .si-book-card,
    .si-inline-catalog,
    .si-content-card,
    .si-comments-card,
    .si-side-card {
        border-left: 0;
        border-right: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .si-inline-catalog {
        margin-top: 12px;
        border-top: 1px solid var(--si-line);
        border-bottom: 1px solid var(--si-line);
    }

    .si-book-head h1 { font-size: 24px; }
    .si-reader-content { font-size: 17px; line-height: 1.82; }
    .si-nav { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); }
    .si-nav-btn { min-height: 40px; font-size: 13px; min-width: 0; }
    .si-nav .si-nav-btn:nth-child(2) { min-width: 82px; }

    .catalog-modal { align-items: flex-end; padding: 0; }
    .catalog-panel {
        width: 100%;
        max-height: 78vh;
        border-radius: 14px 14px 0 0;
        border-left: 0;
        border-right: 0;
    }

    .search-form { grid-template-columns: 1fr; }
}
/* info page: isolated style namespace rf- */
:root {
    color-scheme: light dark;
    --rf-bg: #f3f5f7;
    --rf-panel: #ffffff;
    --rf-text: #1f2a34;
    --rf-muted: #6d7b88;
    --rf-line: #dde4ea;
    --rf-accent: #436e89;
    --rf-accent-soft: #e9f2f8;
    --rf-header-bg: rgba(255, 255, 255, 0.95);
    --rf-shadow: 0 8px 22px rgba(20, 37, 50, 0.08);
}

[data-theme="dark"] {
    --rf-bg: #111922;
    --rf-panel: #182330;
    --rf-text: #e7edf3;
    --rf-muted: #98a9b7;
    --rf-line: #2b3948;
    --rf-accent: #83adc4;
    --rf-accent-soft: #1e2d3a;
    --rf-header-bg: rgba(24, 35, 48, 0.94);
    --rf-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--rf-bg);
    color: var(--rf-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

a { color: inherit; text-decoration: none; }

.rf-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding-left: 16px;
    padding-right: 16px;
}

.rf-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--rf-header-bg);
    border-bottom: 1px solid var(--rf-line);
    backdrop-filter: blur(10px);
}

.rf-header-inner {
    min-height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.rf-brand {
    display: flex;
    flex-direction: column;
}

.rf-brand strong {
    font-size: 22px;
    line-height: 1.2;
    letter-spacing: 0.4px;
}

.rf-brand span {
    margin-top: 2px;
    font-size: 12px;
    color: var(--rf-muted);
}

.rf-header-actions {
    display: inline-flex;
    gap: 8px;
}

.rf-btn {
    min-height: 34px;
    border-radius: 999px;
    border: 1px solid transparent;
    padding: 0 13px;
    font-size: 13px;
    cursor: pointer;
}

.rf-btn-light {
    background: var(--rf-panel);
    border-color: var(--rf-line);
    color: var(--rf-text);
}

.rf-btn-light:hover {
    border-color: var(--rf-accent);
    color: var(--rf-accent);
}

.rf-main {
    padding-top: 14px;
    padding-bottom: 24px;
}

.rf-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 12px;
}

.rf-article,
.rf-side { min-width: 0; }

.rf-side {
    position: sticky;
    top: 66px;
    align-self: start;
}

.rf-article {
    border: 1px solid var(--rf-line);
    border-radius: 10px;
    background: var(--rf-panel);
    box-shadow: var(--rf-shadow);
    overflow: hidden;
}

.rf-hero {
    padding: 14px 12px;
    border-bottom: 1px solid var(--rf-line);
    background: linear-gradient(180deg, var(--rf-accent-soft), var(--rf-panel));
}

.rf-hero h1 {
    margin: 0;
    font-size: 30px;
    line-height: 1.35;
}

.rf-meta {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    color: var(--rf-muted);
    font-size: 13px;
}

.rf-nav {
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.rf-nav-top {
    border-bottom: 1px solid var(--rf-line);
}

.rf-nav-btn {
    min-height: 42px;
    border: 1px solid var(--rf-line);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    font-size: 14px;
    background: var(--rf-panel);
    color: var(--rf-text);
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.rf-nav-btn.is-book-nav .book-nav-text {
    white-space: normal;
    text-align: center;
    line-height: 1.35;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.rf-nav-btn:hover {
    border-color: var(--rf-accent);
    color: var(--rf-accent);
}

.rf-content {
    padding: 14px 12px;
    font-size: 18px;
    line-height: 1.9;
    letter-spacing: 0.2px;
    word-break: break-word;
}

.rf-content p {
    margin: 0 0 1.1em;
    text-indent: 2em;
}

.rf-side-panel {
    border: 1px solid var(--rf-line);
    border-radius: 10px;
    background: var(--rf-panel);
    box-shadow: var(--rf-shadow);
    overflow: hidden;
}

.rf-side-head {
    padding: 10px 12px;
    border-bottom: 1px solid var(--rf-line);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.rf-side-head h2 {
    margin: 0;
    font-size: 17px;
}

.rf-link-btn {
    border: 1px solid var(--rf-line);
    background: var(--rf-panel);
    color: var(--rf-text);
    border-radius: 8px;
    min-height: 30px;
    padding: 0 10px;
    font-size: 12px;
    cursor: pointer;
}

.rf-side-list {
    padding: 10px 12px;
    display: grid;
    gap: 7px;
}

.rf-side-list a {
    border: 1px solid var(--rf-line);
    border-radius: 8px;
    min-height: 34px;
    padding: 7px 9px;
    font-size: 13px;
    display: flex;
    align-items: center;
}

.rf-side-list a:hover,
.rf-side-list a.is-current {
    border-color: var(--rf-accent);
    color: var(--rf-accent);
}

.rf-empty-inline {
    color: var(--rf-muted);
    font-size: 13px;
    text-align: center;
    padding: 18px 8px;
}

.catalog-modal {
    position: fixed;
    inset: 0;
    background: rgba(5, 12, 18, 0.55);
    z-index: 2147483646;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.catalog-modal.is-open {
    display: flex;
}

.catalog-panel {
    width: min(760px, 100%);
    max-height: 82vh;
    background: var(--rf-panel);
    border: 1px solid var(--rf-line);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.catalog-head {
    min-height: 52px;
    padding: 0 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--rf-line);
}

.catalog-close {
    border: 1px solid var(--rf-line);
    background: var(--rf-panel);
    color: var(--rf-text);
    border-radius: 8px;
    padding: 6px 10px;
    cursor: pointer;
}

.catalog-list-wrap {
    overflow: auto;
    padding: 10px;
}

.catalog-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 8px;
}

.catalog-list a {
    display: block;
    border: 1px solid var(--rf-line);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 14px;
}

.catalog-list a:hover,
.catalog-list a.is-current {
    border-color: var(--rf-accent);
    color: var(--rf-accent);
}

.catalog-empty {
    text-align: center;
    color: var(--rf-muted);
    padding: 30px 12px;
}

.search-modal {
    position: fixed;
    inset: 0;
    background: rgba(5, 12, 18, 0.55);
    z-index: 2147483646;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.search-modal.is-open {
    display: flex;
}

.search-panel {
    width: min(640px, 100%);
    background: var(--rf-panel);
    border: 1px solid var(--rf-line);
    border-radius: 12px;
    padding: 14px;
}

.search-form {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
}

.search-input {
    width: 100%;
    min-height: 40px;
    border: 1px solid var(--rf-line);
    border-radius: 10px;
    padding: 0 12px;
    color: var(--rf-text);
    background: var(--rf-panel);
}

.search-submit,
.search-close {
    min-height: 40px;
    border: 1px solid var(--rf-line);
    border-radius: 10px;
    padding: 0 14px;
    background: var(--rf-panel);
    color: var(--rf-text);
    cursor: pointer;
}

.search-submit {
    border-color: var(--rf-accent);
    background: var(--rf-accent);
    color: #fff;
}

.rf-footer {
    margin-top: 16px;
    border-top: 1px solid var(--rf-line);
    background: var(--rf-panel);
}

.rf-footer-inner {
    padding-top: 16px;
    padding-bottom: 16px;
    text-align: center;
}

.rf-footer-links {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    color: var(--rf-muted);
    font-size: 13px;
}

.rf-footer-links a:hover {
    color: var(--rf-accent);
}

.rf-copy {
    margin: 10px 0 0;
    font-size: 12px;
    color: var(--rf-muted);
}

@media (max-width: 1024px) {
    .rf-layout {
        grid-template-columns: 1fr;
    }

    .rf-side {
        position: static;
    }
}

@media (max-width: 900px) {
    .rf-main {
        padding-top: 10px;
        padding-bottom: 12px;
    }

    .rf-wrap {
        padding-left: 0;
        padding-right: 0;
    }

    .rf-header .rf-wrap {
        padding-left: 12px;
        padding-right: 12px;
    }

    .rf-brand span {
        display: none;
    }

    .rf-brand strong {
        font-size: 19px;
    }

    .rf-btn-light {
        min-height: 32px;
        padding: 0 10px;
        font-size: 12px;
    }

    .rf-article,
    .rf-side-panel {
        border-left: 0;
        border-right: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .rf-hero h1 {
        font-size: 24px;
    }

    .rf-content {
        font-size: 17px;
        line-height: 1.82;
    }

    .rf-nav {
        grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    }

    .rf-nav-btn {
        min-height: 40px;
        font-size: 13px;
        min-width: 0;
    }

    .rf-nav .rf-nav-btn:nth-child(2) {
        min-width: 82px;
    }

    .catalog-modal {
        align-items: flex-end;
        padding: 0;
    }

    .catalog-panel {
        width: 100%;
        max-height: 78vh;
        border-radius: 14px 14px 0 0;
        border-left: 0;
        border-right: 0;
    }

    .search-form {
        grid-template-columns: 1fr;
    }
}

/* chapter reader v2: isolated namespace rd- */
:root {
    --rd-bg: #f4f6f8;
    --rd-panel: #ffffff;
    --rd-text: #1f2a34;
    --rd-muted: #6d7b88;
    --rd-line: #dde4ea;
    --rd-accent: #436e89;
    --rd-accent-soft: #eaf2f8;
    --rd-header-bg: rgba(255, 255, 255, 0.95);
    --rd-shadow: 0 8px 22px rgba(20, 37, 50, 0.08);
}

[data-theme="dark"] {
    --rd-bg: #111922;
    --rd-panel: #182330;
    --rd-text: #e7edf3;
    --rd-muted: #98a9b7;
    --rd-line: #2b3948;
    --rd-accent: #83adc4;
    --rd-accent-soft: #1e2d3a;
    --rd-header-bg: rgba(24, 35, 48, 0.94);
    --rd-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.rd-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding-left: 16px;
    padding-right: 16px;
}

.rd-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--rd-header-bg);
    border-bottom: 1px solid var(--rd-line);
    backdrop-filter: blur(10px);
}

.rd-header-inner {
    min-height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.rd-brand {
    display: flex;
    flex-direction: column;
}

.rd-brand strong {
    font-size: 22px;
    line-height: 1.2;
    letter-spacing: 0.4px;
}

.rd-brand span {
    margin-top: 2px;
    font-size: 12px;
    color: var(--rd-muted);
}

.rd-header-actions {
    display: inline-flex;
    gap: 8px;
}

.rd-btn {
    min-height: 34px;
    border-radius: 999px;
    border: 1px solid transparent;
    padding: 0 13px;
    font-size: 13px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.rd-btn-light {
    background: var(--rd-panel);
    border-color: var(--rd-line);
    color: var(--rd-text);
}

.rd-btn-light:hover {
    border-color: var(--rd-accent);
    color: var(--rd-accent);
}

.rd-main {
    padding-top: 10px;
    padding-bottom: 24px;
    background: var(--rd-bg);
}

.rd-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
}

.rd-reader-card,
.rd-side-card {
    border: 1px solid var(--rd-line);
    border-radius: 10px;
    background: var(--rd-panel);
    box-shadow: var(--rd-shadow);
}

.rd-reader-card {
    max-width: 980px;
    margin: 0 auto;
}

.rd-reader-head {
    padding: 14px 12px;
    border-bottom: 1px solid var(--rd-line);
    background: linear-gradient(180deg, var(--rd-accent-soft), var(--rd-panel));
}

.rd-reader-head h1 {
    margin: 0;
    font-size: 30px;
    line-height: 1.35;
}

.rd-meta {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--rd-muted);
}

.rd-nav {
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.rd-nav-bottom {
    border-top: 1px solid var(--rd-line);
}

.rd-nav-btn {
    min-height: 42px;
    border: 1px solid var(--rd-line);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    font-size: 14px;
    background: var(--rd-panel);
    color: var(--rd-text);
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.rd-nav-btn:hover {
    border-color: var(--rd-accent);
    color: var(--rd-accent);
}

.rd-nav-btn.is-book-nav .book-nav-text {
    white-space: normal;
    text-align: center;
    line-height: 1.35;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.rd-content {
    padding: 16px 12px;
    font-size: 19px;
    line-height: 1.95;
    letter-spacing: 0.2px;
    word-break: break-word;
}

.rd-content p {
    margin: 0 0 1.1em;
    text-indent: 2em;
}

.rd-footer {
    margin-top: 16px;
    border-top: 1px solid var(--rd-line);
    background: var(--rd-panel);
}

.rd-footer-inner {
    padding-top: 16px;
    padding-bottom: 16px;
    text-align: center;
}

.rd-footer-links {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    color: var(--rd-muted);
    font-size: 13px;
}

.rd-footer-links a:hover {
    color: var(--rd-accent);
}

.rd-copy {
    margin: 10px 0 0;
    font-size: 12px;
    color: var(--rd-muted);
}

@media (max-width: 1024px) {
    .rd-reader-card {
        max-width: 100%;
    }
}

@media (max-width: 900px) {
    .rd-wrap {
        padding-left: 0;
        padding-right: 0;
    }

    .rd-header .rd-wrap {
        padding-left: 12px;
        padding-right: 12px;
    }

    .rd-brand span {
        display: none;
    }

    .rd-brand strong {
        font-size: 19px;
    }

    .rd-btn-light {
        min-height: 32px;
        padding: 0 10px;
        font-size: 12px;
    }

    .rd-reader-card,
    .rd-side-card {
        border-left: 0;
        border-right: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .rd-reader-head h1 {
        font-size: 24px;
    }

    .rd-content {
        font-size: 17px;
        line-height: 1.82;
    }

    .rd-nav {
        grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    }

    .rd-nav-btn {
        min-height: 40px;
        font-size: 13px;
        min-width: 0;
    }

    .rd-nav .rd-nav-btn:nth-child(2) {
        min-width: 82px;
    }
}

/* chapter page (tpl_reader.php original structure) */
.reader-main {
    /* Keep content below the fixed/sticky top bar */
    padding-top: 72px;
    padding-bottom: 24px;
    background: var(--sf-bg, #f4f6f8);
}

.reader-shell {
    max-width: 980px;
    margin: 0 auto;
    border: 1px solid var(--sf-line, #dde4ea);
    border-radius: 10px;
    background: var(--sf-panel, #ffffff);
    box-shadow: var(--sf-shadow, 0 8px 22px rgba(20, 37, 50, 0.08));
}

.reader-head {
    padding: 14px 12px;
    border-bottom: 1px solid var(--sf-line, #dde4ea);
    background: linear-gradient(180deg, var(--sf-accent-soft, #eaf2f8), var(--sf-panel, #ffffff));
}

.reader-title {
    margin: 0;
    font-size: 30px;
    line-height: 1.35;
    color: var(--sf-text, #1f2a34);
}


.reader-meta {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--sf-muted, #6d7b88);
}

.reader-meta > span {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    line-height: 1;
}

.reader-meta .tag {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 8px;
    border-radius: 999px;
    border: 1px solid var(--sf-line, #dde4ea);
    background: var(--sf-panel, #ffffff);
    color: var(--sf-accent, #436e89);
    font-size: 12px;
}

.reader-nav {
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.reader-nav + .reader-nav {
    border-top: 1px solid var(--sf-line, #dde4ea);
}

.reader-nav-btn {
    min-height: 42px;
    border: 1px solid var(--sf-line, #dde4ea);
    border-radius: 8px;
    background: var(--sf-panel, #ffffff);
    color: var(--sf-text, #1f2a34);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    font-size: 14px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.reader-nav-btn:hover {
    border-color: var(--sf-accent, #436e89);
    color: var(--sf-accent, #436e89);
}

.reader-nav-btn.is-book-nav .book-nav-text {
    white-space: normal;
    text-align: center;
    line-height: 1.35;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.reader-content {
    padding: 16px 12px;
    color: var(--sf-text, #1f2a34);
    font-size: 19px;
    line-height: 1.95;
    letter-spacing: 0.2px;
    word-break: break-word;
}

.reader-content p {
    margin: 0 0 1.1em;
    text-indent: 2em;
}

.reader-main + .site-footer {
    margin-top: 16px;
    border-top: 1px solid var(--sf-line, #dde4ea);
    background: var(--sf-panel, #ffffff);
}

@media (max-width: 1024px) {
    .reader-shell {
        max-width: 100%;
    }
}

@media (max-width: 900px) {
    .reader-main {
        padding-top: 62px;
        padding-bottom: 12px;
    }

    .reader-shell {
        border-left: 0;
        border-right: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .reader-title {
        font-size: 26px;
        line-height: 1.4;
    }

    .reader-meta {
        font-size: 14px;
        gap: 10px;
    }

    .reader-meta .tag {
        font-size: 13px;
        min-height: 26px;
        padding: 0 10px;
    }

    /* 參考主流閱讀站：手機正文 18–20px、行距 1.95–2.0 */
    .reader-content {
        font-size: 20px;
        line-height: 2;
        padding: 18px 14px;
        letter-spacing: 0.3px;
    }

    .reader-nav {
        grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
        padding: 14px 12px;
        gap: 10px;
    }

    .reader-nav-btn {
        min-height: 44px;
        font-size: 15px;
        min-width: 0;
    }

    .reader-nav .reader-nav-btn:nth-child(2) {
        min-width: 88px;
    }

    .catalog-head strong {
        font-size: 17px;
    }

    .catalog-close {
        font-size: 14px;
        padding: 8px 12px;
    }

    .catalog-list a {
        font-size: 16px;
        padding: 12px 14px;
    }

    .site-header .search-toggle,
    .site-header .theme-toggle {
        min-height: 36px;
        padding: 0 12px;
        font-size: 14px;
    }
}

/* make current chapter obvious in reader catalog modal */
.catalog-list a {
    position: relative;
    transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.catalog-list a.is-current {
    border-color: var(--sf-accent, #436e89);
    background: linear-gradient(180deg, var(--sf-accent-soft, #eaf2f8), var(--sf-panel, #ffffff));
    color: var(--sf-accent, #436e89);
    font-weight: 700;
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--sf-accent, #436e89) 22%, transparent);
    padding-left: 14px;
}

.catalog-list a.is-current::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 16px;
    border-radius: 999px;
    background: var(--sf-accent, #436e89);
}

[data-theme="dark"] .catalog-list a.is-current {
    background: linear-gradient(180deg, color-mix(in srgb, var(--sf-accent, #83adc4) 18%, var(--sf-panel, #182330)), var(--sf-panel, #182330));
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--sf-accent, #83adc4) 30%, transparent);
}

.reader-latest {
    border-top: 1px solid var(--sf-line, #dde4ea);
    background: var(--sf-panel, #ffffff);
}

.reader-latest-head {
    padding: 12px;
    border-bottom: 1px solid var(--sf-line, #dde4ea);
    background: linear-gradient(180deg, var(--sf-accent-soft, #eaf2f8), var(--sf-panel, #ffffff));
}

.reader-latest-head h2 {
    margin: 0;
    font-size: 18px;
    line-height: 1.35;
    color: var(--sf-text, #1f2a34);
}

.reader-latest-list {
    list-style: none;
    margin: 0;
    padding: 8px 12px 12px;
    display: grid;
    gap: 8px;
}

.reader-latest-item {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 52px;
    padding: 10px 12px;
    border: 1px solid var(--sf-line, #dde4ea);
    border-radius: 10px;
    color: var(--sf-text, #1f2a34);
    background: var(--sf-panel, #ffffff);
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.reader-latest-list li:last-child .reader-latest-item {
    border-bottom: 1px solid var(--sf-line, #dde4ea);
}

.reader-latest-item:hover {
    background: var(--sf-accent-soft, #eaf2f8);
    border-color: color-mix(in srgb, var(--sf-accent, #436e89) 35%, var(--sf-line, #dde4ea));
    color: var(--sf-accent, #436e89);
}

.reader-latest-rank {
    flex: 0 0 auto;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.02em;
    background: var(--sf-accent-soft, #eaf2f8);
    color: var(--sf-accent, #436e89);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--sf-accent, #436e89) 18%, transparent);
}

.reader-latest-list li:nth-child(1) .reader-latest-rank {
    background: linear-gradient(145deg, #f0b429, #ffd666);
    color: #6b4a00;
    box-shadow: inset 0 0 0 1px rgba(139, 96, 0, 0.22);
}

.reader-latest-list li:nth-child(2) .reader-latest-rank {
    background: linear-gradient(145deg, #a8b4c0, #d5dde5);
    color: #2f3b46;
    box-shadow: inset 0 0 0 1px rgba(47, 59, 70, 0.18);
}

.reader-latest-list li:nth-child(3) .reader-latest-rank {
    background: linear-gradient(145deg, #d4834a, #efb07a);
    color: #4a2d12;
    box-shadow: inset 0 0 0 1px rgba(74, 45, 18, 0.2);
}

.reader-latest-title {
    flex: 1 1 auto;
    min-width: 0;
    font-size: 17px;
    font-weight: 500;
    line-height: 1.5;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

[data-theme="dark"] .reader-latest-list li:nth-child(1) .reader-latest-rank {
    background: linear-gradient(145deg, #b8891a, #d4a832);
    color: #fff8e6;
}

[data-theme="dark"] .reader-latest-list li:nth-child(2) .reader-latest-rank {
    background: linear-gradient(145deg, #6e7d8a, #95a3af);
    color: #f0f4f7;
}

[data-theme="dark"] .reader-latest-list li:nth-child(3) .reader-latest-rank {
    background: linear-gradient(145deg, #a86232, #c9824f);
    color: #fff3ea;
}

@media (max-width: 900px) {
    .reader-latest-head {
        padding: 12px 14px;
    }

    .reader-latest-head h2 {
        font-size: 19px;
    }

    .reader-latest-list {
        padding: 10px 14px 14px;
        gap: 10px;
    }

    .reader-latest-item {
        min-height: 56px;
        padding: 12px 14px;
        gap: 14px;
    }

    .reader-latest-rank {
        width: 34px;
        height: 34px;
        font-size: 16px;
        border-radius: 9px;
    }

    .reader-latest-title {
        font-size: 18px;
        line-height: 1.55;
        line-clamp: 3;
        -webkit-line-clamp: 3;
    }
}