:root {
    --bg: #edf6f2;
    --bg-deep: #dcefe7;
    --paper: rgba(255, 255, 255, 0.9);
    --paper-strong: rgba(255, 255, 255, 0.97);
    --paper-soft: rgba(255, 255, 255, 0.72);
    --glass: rgba(255, 255, 255, 0.48);
    --glass-soft: rgba(255, 255, 255, 0.3);
    --ink: #132325;
    --ink-soft: #4f6668;
    --ink-quiet: #708486;
    --line: rgba(16, 57, 60, 0.12);
    --line-strong: rgba(16, 57, 60, 0.22);
    --accent: #0e5a5d;
    --accent-strong: #0a3d3f;
    --accent-soft: rgba(14, 90, 93, 0.1);
    --shadow: 0 24px 56px rgba(17, 63, 58, 0.12);
    --shadow-soft: 0 12px 28px rgba(17, 63, 58, 0.08);
    --cover-top: #117a3a;
    --cover-mid: #075d34;
    --cover-bottom: #053321;
    --cover-spine: #05301f;
    --cover-line: rgba(255, 255, 255, 0.54);
    --cover-ink: #ffffff;
    --cover-author: rgba(255, 255, 255, 0.62);
    --cover-shadow: rgba(7, 43, 32, 0.34);
    --font-display: "Iowan Old Style", "Baskerville", "Times New Roman", "Songti SC", "STSong", serif;
    --font-body: "Avenir Next", "PingFang SC", "Noto Sans SC", "Helvetica Neue", sans-serif;

    --primary-color: var(--accent);
    --primary-dark: var(--accent-strong);
    --primary-light: #b2dfdb;
    --accent-color: var(--accent);
    --text-primary: var(--ink);
    --text-secondary: var(--ink-soft);
    --text-on-primary: #ffffff;
    --divider-color: var(--line);
    --background-color: var(--bg);
    --surface-color: var(--paper-strong);

    --elevation-1: var(--shadow-soft);
    --elevation-2: 0 14px 32px rgba(17, 63, 58, 0.1);
    --elevation-4: 0 20px 42px rgba(17, 63, 58, 0.14);
    --elevation-8: var(--shadow);
}

:root[data-theme="dark"] {
    --bg: #071417;
    --bg-deep: #0d2226;
    --paper: rgba(10, 24, 28, 0.86);
    --paper-strong: rgba(10, 20, 24, 0.96);
    --paper-soft: rgba(18, 36, 41, 0.78);
    --glass: rgba(8, 22, 27, 0.58);
    --glass-soft: rgba(12, 28, 33, 0.72);
    --ink: #eef7f4;
    --ink-soft: #a6c2bf;
    --ink-quiet: #7e9a98;
    --line: rgba(120, 215, 193, 0.16);
    --line-strong: rgba(120, 215, 193, 0.28);
    --accent: #75d8c3;
    --accent-strong: #b4fff0;
    --accent-soft: rgba(117, 216, 195, 0.14);
    --shadow: 0 28px 60px rgba(0, 0, 0, 0.32);
    --shadow-soft: 0 14px 32px rgba(0, 0, 0, 0.22);
    --text-on-primary: #062025;
    --cover-line: rgba(255, 255, 255, 0.42);
    --cover-author: rgba(255, 255, 255, 0.58);
    --cover-shadow: rgba(0, 0, 0, 0.42);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    padding: 0;
    color: var(--ink);
    font-family: var(--font-body);
    background:
        radial-gradient(circle at top left, rgba(222, 243, 236, 0.86), transparent 34%),
        radial-gradient(circle at 90% 14%, rgba(187, 229, 219, 0.54), transparent 26%),
        linear-gradient(180deg, #f7fcfa 0%, var(--bg) 52%, #e6f3ee 100%);
    -webkit-font-smoothing: antialiased;
}

:root[data-theme="dark"] body {
    background:
        radial-gradient(circle at top left, rgba(23, 83, 76, 0.38), transparent 34%),
        radial-gradient(circle at 90% 14%, rgba(37, 111, 101, 0.22), transparent 26%),
        linear-gradient(180deg, #071417 0%, #0b191d 48%, #0d1f24 100%);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.2;
    background-image:
        linear-gradient(rgba(16, 57, 60, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(16, 57, 60, 0.03) 1px, transparent 1px);
    background-size: 32px 32px;
}

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

button,
input,
select {
    font: inherit;
}

.container,
.page-shell {
    width: min(1320px, calc(100vw - 24px));
    max-width: none;
    margin: 0 auto;
    padding: 12px 0 36px;
}

.home-topbar,
.home-intro,
.catalog-toolbar,
.book-card,
.catalog-empty-state,
.catalog-page-link {
    border: 1px solid var(--line);
    background: linear-gradient(180deg, var(--paper-strong), var(--paper));
    box-shadow: var(--shadow-soft);
}

.home-topbar {
    position: sticky;
    top: 12px;
    z-index: 30;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 16px;
    align-items: center;
    margin-bottom: 18px;
    padding: 12px;
    border-radius: 24px;
    background: var(--paper-soft);
    backdrop-filter: blur(16px);
}

.brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.brand-logo {
    width: 44px;
    height: 44px;
    border-radius: 15px;
    box-shadow: 0 10px 22px rgba(17, 35, 37, 0.14);
    object-fit: cover;
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

.brand-text strong {
    color: var(--ink);
    font-size: 1rem;
    line-height: 1.1;
}

.brand-text span {
    color: var(--ink-quiet);
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.topnav {
    display: flex;
    justify-content: center;
    gap: 10px;
    min-width: 0;
}

.topnav a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0 14px;
    border: 1px solid transparent;
    border-radius: 999px;
    color: var(--ink-soft);
    font-size: 0.88rem;
    font-weight: 650;
    white-space: nowrap;
}

.topnav a:hover {
    border-color: var(--line);
    background: var(--glass-soft);
    color: var(--ink);
}

.topbar-tools {
    display: inline-flex;
    justify-content: flex-end;
    gap: 8px;
}

.tool-switch {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--glass-soft);
}

.tool-chip {
    min-height: 32px;
    padding: 0 11px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--ink-soft);
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.tool-chip:hover {
    transform: translateY(-1px);
    color: var(--ink);
}

.tool-chip.is-active {
    background: var(--accent);
    color: var(--text-on-primary);
}

.home-intro {
    position: relative;
    display: none;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 26px;
    align-items: center;
    margin-bottom: 20px;
    padding: clamp(24px, 5vw, 48px);
    overflow: hidden;
    border-radius: 30px;
}

.home-intro::before {
    content: "";
    position: absolute;
    inset: auto -14% -50% 48%;
    height: 220px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(14, 90, 93, 0.16), transparent 66%);
    pointer-events: none;
}

.home-intro-copy {
    position: relative;
    min-width: 0;
}

.home-intro-heading {
    display: flex;
    align-items: center;
    gap: 14px;
}

.home-intro-logo {
    width: 52px;
    height: 52px;
    border-radius: 17px;
    box-shadow: 0 12px 28px rgba(17, 35, 37, 0.14);
    background: #fff;
    object-fit: cover;
}

.home-intro-eyebrow {
    margin-bottom: 12px;
    color: var(--accent);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.home-intro-title {
    margin: 0;
    color: var(--ink);
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 4.8rem);
    font-weight: 700;
    line-height: 0.98;
}

.home-intro-text {
    max-width: 700px;
    margin: 18px 0 0;
    color: var(--ink-soft);
    font-size: 1rem;
    line-height: 1.75;
}

.home-intro-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 22px;
    border-radius: 999px;
    background: var(--accent);
    color: var(--text-on-primary);
    font-size: 0.93rem;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(14, 90, 93, 0.2);
    transition: transform 180ms ease, box-shadow 180ms ease;
    white-space: nowrap;
}

.home-intro-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 34px rgba(14, 90, 93, 0.26);
}

.catalog-toolbar {
    display: grid;
    grid-template-columns: minmax(280px, 0.9fr) minmax(0, 2.4fr);
    gap: 10px;
    align-items: start;
    margin-bottom: 10px;
}

.catalog-panel {
    display: grid;
    gap: 8px;
    min-height: 86px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--paper);
    backdrop-filter: blur(14px);
}

.catalog-panel-heading {
    color: var(--ink);
    font-size: 0.82rem;
    font-weight: 850;
    line-height: 1;
}

.catalog-filter-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.catalog-search {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    width: 100%;
}

.catalog-search-input,
.catalog-select {
    width: 100%;
    min-height: 38px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper-strong);
    color: var(--ink);
    font-size: 0.86rem;
    outline: none;
}

.catalog-search-input:focus,
.catalog-select:focus {
    border-color: var(--line-strong);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.catalog-search-input::placeholder {
    color: var(--ink-quiet);
}

.catalog-filters {
    display: grid;
    grid-template-columns: repeat(4, minmax(116px, 1fr));
    gap: 8px;
    align-items: center;
}

.catalog-filter-toggle {
    display: none;
}

.catalog-select[name="dynasty"],
.catalog-select[name="period"],
.catalog-select[name="region"],
.catalog-select[name="tag"],
.catalog-select[name="author"] {
    display: none;
}

.catalog-submit,
.catalog-search-submit,
.catalog-reset,
.catalog-page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 13px;
    border-radius: 8px;
    font-size: 0.84rem;
    font-weight: 800;
}

.catalog-submit {
    border: 0;
    background: var(--accent);
    color: var(--text-on-primary);
    cursor: pointer;
}

.catalog-search-submit {
    border: 0;
    background: var(--accent);
    color: var(--text-on-primary);
    cursor: pointer;
}

.catalog-reset,
.catalog-page-link {
    color: var(--accent);
}

.catalog-pager {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    margin: 8px 0 12px;
}

.catalog-results,
.catalog-page-indicator {
    color: var(--ink-soft);
    font-size: 0.82rem;
}

.catalog-results {
    margin-right: auto;
    color: var(--ink);
    font-size: 0.92rem;
    font-weight: 800;
}

.catalog-page-indicator {
    white-space: nowrap;
}

.catalog-page-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.catalog-active-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin: 0 0 12px;
}

.catalog-chip {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 750;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
    align-items: stretch;
    gap: 10px;
}

.book-card {
    position: relative;
    display: flex;
    height: 100%;
    min-height: 0;
    flex-direction: column;
    overflow: hidden;
    border-radius: 12px;
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.book-card:hover {
    border-color: var(--line-strong);
    box-shadow: var(--shadow-soft);
    transform: translateY(-1px);
}

.book-card-content {
    display: grid;
    grid-template-columns: 68px minmax(0, 1fr) auto;
    gap: 14px;
    align-items: start;
    min-height: 126px;
    height: 100%;
    padding: 10px;
    background: var(--paper-strong);
    color: var(--ink);
}

.book-cover {
    position: relative;
    width: 68px;
    aspect-ratio: 2 / 3;
    align-self: start;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    background: linear-gradient(180deg, var(--cover-top) 0%, var(--cover-bottom) 100%);
    box-shadow: none;
    isolation: isolate;
}

.book-cover::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.02);
    pointer-events: none;
    z-index: 1;
}

.book-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 34%);
    pointer-events: none;
    z-index: 2;
}

.book-cover-theme-classic {
    --cover-top: #0d8f3a;
    --cover-mid: #066938;
    --cover-bottom: #073821;
    --cover-spine: #06331e;
    --cover-shadow: rgba(5, 52, 34, 0.34);
}

.book-cover-theme-early,
.book-cover-theme-fairy {
    --cover-top: #e14f78;
    --cover-mid: #b52858;
    --cover-bottom: #651234;
    --cover-spine: #5a0f2f;
    --cover-shadow: rgba(116, 24, 65, 0.28);
}

.book-cover-theme-middle {
    --cover-top: #1f9d78;
    --cover-mid: #08735f;
    --cover-bottom: #073d38;
    --cover-spine: #053735;
    --cover-shadow: rgba(7, 61, 56, 0.3);
}

.book-cover-theme-junior,
.book-cover-theme-literature {
    --cover-top: #c92521;
    --cover-mid: #991612;
    --cover-bottom: #560b0d;
    --cover-spine: #4d0b0c;
    --cover-shadow: rgba(110, 18, 19, 0.31);
}

.book-cover-theme-senior,
.book-cover-theme-history {
    --cover-top: #b45b20;
    --cover-mid: #7e3416;
    --cover-bottom: #3f1b12;
    --cover-spine: #35160f;
    --cover-shadow: rgba(91, 43, 19, 0.3);
}

.book-cover-theme-science {
    --cover-top: #2179b8;
    --cover-mid: #185a8e;
    --cover-bottom: #15304f;
    --cover-spine: #122b47;
    --cover-shadow: rgba(22, 74, 116, 0.3);
}

.book-cover-theme-poetry {
    --cover-top: #7459b5;
    --cover-mid: #523889;
    --cover-bottom: #2e214f;
    --cover-spine: #2a1e48;
    --cover-shadow: rgba(71, 51, 122, 0.3);
}

.book-cover-fallback {
    position: relative;
    z-index: 3;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 8px 6px;
    color: var(--cover-ink);
    text-align: center;
}

.book-cover-title {
    display: -webkit-box;
    width: 100%;
    overflow: hidden;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 900;
    line-height: 1.08;
    letter-spacing: 0;
    overflow-wrap: anywhere;
    text-align: center;
    text-shadow: none;
    text-wrap: balance;
    word-break: break-word;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 6;
}

.book-cover-short .book-cover-fallback {
    padding: 10px 7px;
}

.book-cover-short .book-cover-title {
    align-self: center;
    font-size: 0.98rem;
    line-height: 1.08;
    -webkit-line-clamp: 4;
}

.book-cover-dense .book-cover-fallback {
    padding: 7px 6px;
}

.book-cover-dense .book-cover-title {
    font-family: var(--font-body);
    font-size: 0.58rem;
    font-weight: 860;
    line-height: 1.06;
    -webkit-line-clamp: 6;
}

.book-cover-longword .book-cover-fallback {
    padding: 7px 5px;
}

.book-cover-longword .book-cover-title {
    font-family: var(--font-body);
    font-size: 0.54rem;
    font-weight: 900;
    line-height: 1.05;
    overflow-wrap: anywhere;
    text-align: center;
    word-break: break-word;
    -webkit-line-clamp: 6;
}

.book-card-details {
    display: grid;
    grid-template-rows: 1.2rem 24px 24px;
    align-content: center;
    row-gap: 7px;
    min-width: 0;
    height: 102px;
}

.book-meta {
    min-height: 1.2rem;
    max-height: 1.2rem;
    overflow: hidden;
    color: var(--ink-soft);
    font-size: 0.86rem;
    line-height: 1.35;
    overflow-wrap: anywhere;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-tags {
    display: flex;
    flex-wrap: nowrap;
    gap: 5px;
    height: 24px;
    margin: 0;
    overflow: hidden;
}

.book-tags span {
    max-width: 136px;
    overflow: hidden;
    padding: 3px 7px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink-soft);
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.1;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.book-audience {
    display: inline-flex;
    align-self: flex-start;
    min-height: 24px;
    margin-top: 0;
    padding: 4px 8px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.74rem;
    font-weight: 800;
    line-height: 1.2;
}

.book-card-actions {
    display: flex;
    flex-direction: column;
    gap: 7px;
    min-width: 84px;
    padding-top: 12px;
}

.book-action-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 32px;
    padding: 0 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: 0.76rem;
    font-weight: 800;
    transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.book-action-link:hover {
    transform: translateY(-1px);
}

.book-read-link {
    background: var(--accent);
    color: var(--text-on-primary);
    border-color: transparent;
}

.book-download-link {
    background: var(--glass-soft);
    color: var(--accent);
}

.catalog-loading {
    padding: 14px;
    color: var(--ink-soft);
    font-size: 0.86rem;
    text-align: center;
}

.catalog-loading[hidden] {
    display: none;
}

.catalog-scroll-sentinel {
    height: 1px;
}

.catalog-empty-state {
    grid-column: 1 / -1;
    padding: 28px 24px;
    border-radius: 22px;
    color: var(--ink-soft);
    text-align: center;
}

.catalog-page-link {
    min-width: 112px;
}

.catalog-page-link.is-disabled {
    opacity: 0.45;
    pointer-events: none;
}

@media (max-width: 860px) {
    .home-topbar {
        grid-template-columns: 1fr;
    }

    .topnav {
        justify-content: flex-start;
        overflow-x: auto;
        scrollbar-width: none;
    }

    .topnav::-webkit-scrollbar {
        display: none;
    }

    .topbar-tools {
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .home-intro {
        grid-template-columns: 1fr;
    }

    .home-intro-link {
        width: fit-content;
    }

    .catalog-toolbar,
    .catalog-panel {
        grid-template-columns: 1fr;
    }

    .catalog-filters {
        grid-template-columns: repeat(4, minmax(110px, 1fr));
    }
}

@media (max-width: 560px) {
    .container,
    .page-shell {
        width: min(100vw - 16px, 1200px);
        padding-top: 8px;
    }

    .home-topbar,
    .home-intro,
    .catalog-toolbar {
        border-radius: 12px;
    }

    .catalog-toolbar {
        grid-template-columns: 1fr;
    }

    .catalog-panel {
        min-height: 0;
    }

    .catalog-filter-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 38px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--accent);
        color: var(--text-on-primary);
        font-size: 0.84rem;
        font-weight: 800;
    }

    .catalog-toolbar.is-collapsed .catalog-filters {
        display: none;
    }

    .home-intro {
        padding: 22px;
    }

    .home-intro-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .home-intro-title {
        font-size: 2.5rem;
    }

    .catalog-pager {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .catalog-results {
        flex: 1 1 100%;
        margin-right: 0;
    }

    .catalog-page-actions {
        margin-left: auto;
    }

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

    .book-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .book-card-content {
        grid-template-columns: 62px minmax(0, 1fr);
        gap: 10px;
        min-height: 168px;
        padding: 10px;
    }

    .book-cover {
        width: 62px;
    }

    .book-card-details {
        height: 93px;
    }

    .book-card-actions {
        grid-column: 1 / -1;
        flex-direction: row;
        min-width: 0;
    }

    .book-action-link {
        flex: 1 1 0;
    }
}

/* Read Page Styles */
.read-body {
    background-color: #FFFFFF;
}

/* Reader Toolbar */
.reader-toolbar {
    position: fixed;
    top: 16px;
    left: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1100;
}

.reader-tool {
    min-width: 104px;
    height: 48px;
    border: 0;
    border-radius: 18px;
    padding: 0 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    box-shadow: var(--elevation-4);
    backdrop-filter: blur(10px);
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s, color 0.2s;
    text-decoration: none;
}

.reader-tool:hover {
    transform: translateY(-1px);
    box-shadow: var(--elevation-8);
}

.reader-tool:active {
    transform: translateY(0);
}

.reader-tool-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    line-height: 1;
}

.reader-tool-label {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.reader-tool-menu {
    background: rgba(0, 121, 107, 0.92);
    color: #ffffff;
}

.reader-status {
    min-width: 0;
    flex: 1 1 auto;
    padding: 10px 16px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    box-shadow: var(--elevation-2);
    backdrop-filter: blur(10px);
}

.reader-status-title {
    font-size: 14px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.reader-status-meta {
    margin-top: 3px;
    font-size: 12px;
    color: var(--text-secondary);
}

.reader-tool-home,
.reader-tool-font {
    background: rgba(255, 255, 255, 0.92);
    color: var(--text-primary);
}

.reader-tool-download {
    background: rgba(0, 121, 107, 0.1);
    color: var(--primary-color);
}

.reader-tool.is-active {
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.2);
}

.reader-overlay {
    position: fixed;
    inset: 0;
    display: none;
    background: rgba(15, 23, 42, 0.2);
    backdrop-filter: blur(2px);
    z-index: 999;
}

.reader-overlay.is-visible {
    display: block;
}

/* Menus - Material Sheets/Dialogs */
.panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 20px 14px;
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.panel-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
}

.panel-subtitle {
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

#book-menu {
    display: none;
    position: fixed;
    top: 78px;
    left: 16px;
    background: var(--surface-color);
    border-radius: 18px;
    box-shadow: var(--elevation-8);
    padding: 0 0 10px;
    max-height: min(78vh, 720px);
    overflow-y: auto;
    max-width: 360px;
    min-width: 300px;
    z-index: 1000;
    transform-origin: top left;
    animation: menu-pop 0.2s cubic-bezier(0.0, 0.0, 0.2, 1);
}

@keyframes menu-pop {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

#book-menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#book-menu li {
    padding: 0;
}

.lv1-menu {
    padding: 4px 10px 0;
}

.chapter-toggle {
    width: 28px;
    height: 28px;
    border: 0;
    border-radius: 8px;
    background: rgba(83, 109, 254, 0.1);
    color: var(--accent-color);
    cursor: pointer;
    font-size: 16px;
    font-weight: 700;
    margin-right: 8px;
    vertical-align: middle;
}

.book-submenu {
    display: none;
    margin: 4px 0 8px 16px !important;
    padding-left: 12px !important;
    border-left: 2px solid rgba(83, 109, 254, 0.12) !important;
}

.book-menu-item {
    cursor: pointer;
    font-size: 16px;
    color: var(--text-primary);
    display: block;
    padding: 12px 24px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background-color 0.2s;
    border-radius: 10px;
}

.book-menu-item:hover {
    background-color: rgba(83, 109, 254, 0.08);
    color: var(--primary-color);
}

.book-menu-item-primary {
    display: inline-block;
    width: calc(100% - 46px);
    vertical-align: middle;
    font-size: 15px;
    font-weight: 600;
    padding: 12px 14px;
}

.book-menu-item-secondary {
    font-size: 14px;
    padding: 10px 14px;
}

.book-menu-empty {
    display: block;
    padding: 16px 24px 6px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Font Setting Menu */
#font-setting-menu {
    display: none;
    position: fixed;
    top: 78px;
    right: 16px;
    background: var(--surface-color);
    padding: 0 0 18px;
    border-radius: 18px;
    box-shadow: var(--elevation-8);
    z-index: 1000;
    text-align: left;
    min-width: 280px;
    animation: menu-pop 0.2s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.font-control {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 16px 20px 0;
}

.font-control-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
}

.font-control-label {
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 600;
}

.font-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.icon-btn {
    cursor: pointer;
    flex: 1 1 0;
    height: 42px;
    border: 0;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(83, 109, 254, 0.1);
    color: var(--accent-color);
    font-size: 22px;
    font-weight: 700;
    transition: background-color 0.2s, transform 0.2s;
    user-select: none;
}

.icon-btn:hover {
    background-color: rgba(83, 109, 254, 0.16);
    transform: translateY(-1px);
}

.current-size {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
    white-space: nowrap;
}

/* Context Menu */
#context-menu {
    display: none;
    position: absolute;
    background: #333;
    color: white;
    border-radius: 4px;
    padding: 0;
    z-index: 2000;
    transform: translate3d(-50%, -100%, 0px);
    box-shadow: var(--elevation-4);
    overflow: hidden;
}

.context-menu-content {
    display: flex;
}

.context-menu-item {
    cursor: pointer;
    padding: 12px 16px;
    font-size: 14px;
    transition: background-color 0.2s;
}

.context-menu-item:hover {
    background-color: #444;
}

/* Book Content */
#book-content {
    background-color: #FFFFFF;
    font-family: 'syhtRegular', "Noto Serif SC", serif;
    position: fixed;
    inset: 0;
    overflow: hidden;
    z-index: 0;
    --reader-page-padding-top: 92px;
    --reader-page-padding-x: 34px;
    --reader-page-padding-bottom: 34px;
}

.chapter-flow {
    height: 100%;
    box-sizing: border-box;
    padding: var(--reader-page-padding-top) var(--reader-page-padding-x) var(--reader-page-padding-bottom);
    column-gap: calc(var(--reader-page-padding-x) * 2);
    -webkit-column-gap: calc(var(--reader-page-padding-x) * 2);
    column-fill: auto;
    -webkit-column-fill: auto;
    overflow: hidden;
    color: var(--text-primary);
    user-select: text;
    scroll-behavior: smooth;
}

.chapter-flow.is-vertical {
    column-gap: 0;
    -webkit-column-gap: 0;
    column-fill: balance;
    -webkit-column-fill: balance;
    height: auto;
    min-height: 100%;
    overflow: visible;
    transform: translateY(0);
    will-change: transform;
}

.chapter-heading {
    break-after: avoid;
    margin: 0 0 1.2em;
    font-size: 1.6em;
    line-height: 1.3;
    color: var(--text-primary);
}

.chapter-paragraph {
    margin: 0 0 0.7em;
    line-height: 1.9;
    text-indent: 2em;
    word-break: break-word;
    white-space: pre-wrap;
}

.chapter-paragraph.is-empty {
    min-height: 1.1em;
    text-indent: 0;
}

.chapter-flow-rich img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.2em auto;
}

.chapter-flow-rich a {
    color: #1d4ed8;
    text-decoration: underline;
}

.chapter-flow-rich h1,
.chapter-flow-rich h2,
.chapter-flow-rich h3,
.chapter-flow-rich h4,
.chapter-flow-rich h5,
.chapter-flow-rich h6 {
    margin: 1.1em 0 0.55em;
    line-height: 1.45;
}

.chapter-flow-rich p,
.chapter-flow-rich blockquote,
.chapter-flow-rich ul,
.chapter-flow-rich ol,
.chapter-flow-rich table {
    margin: 0.55em 0;
}

.chapter-flow-rich ul,
.chapter-flow-rich ol {
    padding-left: 1.5em;
}

.chapter-flow-rich blockquote {
    padding-left: 1em;
    border-left: 3px solid rgba(15, 118, 110, 0.22);
    color: var(--text-secondary);
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .container {
        padding: 16px;
        padding-top: 24px;
    }

    .catalog-filters {
        grid-template-columns: 1fr;
    }

    .catalog-pager {
        flex-wrap: wrap;
        align-items: center;
    }

    .catalog-results {
        flex: 1 1 100%;
    }

    .catalog-page-actions {
        margin-left: auto;
    }

    .home-intro {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 18px;
        border-radius: 18px;
    }

    .home-intro-title {
        font-size: 24px;
    }

    .home-intro-logo {
        width: 40px;
        height: 40px;
        border-radius: 10px;
    }

    .home-intro-link {
        width: 100%;
    }

    .app-bar {
        height: 56px;
        padding: 0 16px;
    }

    .reader-toolbar {
        top: 10px;
        left: 10px;
        right: 10px;
        gap: 6px;
    }

    .reader-tool {
        min-width: 42px;
        height: 40px;
        padding: 0 10px;
        border-radius: 14px;
    }

    .reader-tool-label {
        display: none;
    }

    .reader-status {
        padding: 8px 12px;
        border-radius: 14px;
    }

    .reader-status-title {
        font-size: 13px;
    }

    .reader-status-meta {
        font-size: 11px;
    }

    #book-content {
        --reader-page-padding-top: 96px;
        --reader-page-padding-x: 20px;
        --reader-page-padding-bottom: 32px;
    }

    #book-menu, #font-setting-menu {
        top: 60px;
        left: 10px;
        right: auto;
        min-width: min(320px, calc(100vw - 20px));
    }

    #book-menu {
        max-width: calc(100vw - 20px);
    }
}