body {
    background-color: var(--bg-body);
    color: var(--text-body);
}

.top-nav {
    display: flex;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
    flex-direction: column;
    align-items: center;
}

.top-nav .chapter-info {
    font-size: 0.85rem;
    color: var(--text-nav);
    text-align: center;
    flex: 1;
}

.top-nav .nav-tool-bar {
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
}

.top-nav .nav-tool-bar a {
    display: block;
}

.reader-content {
    background-color: var(--bg-card);
    border-radius: 4px;
    padding: 60px 64px;
    min-height: 60vh;
}

.reader-content .chapter-title {
    font-size: 1.6rem;
    color: var(--text-title);
    text-align: center;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.6;
}

.reader-content .article-info {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.reader-content .article-info-tag {
    display: inline;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.reader-content .chapter-body {
    font-size: 1rem;
    text-indent: 2em;
    margin-top: 25px;
}

.reader-content .chapter-body p {
    margin-bottom: 1em;
}

.reader-content .chapter-body hr {
    margin: 30px auto;
    width: 75%;
    border-color: #46464626;
}

[data-font-size="small"] .chapter-body {
    font-size: 0.9rem;
}

[data-font-size="large"] .chapter-body {
    font-size: 1.15rem;
}

[data-font-size="xlarge"] .chapter-body {
    font-size: 1.5rem;
}

.reader-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 40px 0 60px;
}

.reader-footer a {
    display: inline-block;
    padding: 8px 24px;
    border: 1px solid var(--btn-border);
    border-radius: 4px;
    font-size: 0.95rem;
    color: var(--btn-text);
    background-color: var(--btn-bg);
    transition: all 0.2s ease;
}

.reader-footer a:hover {
    background-color: var(--btn-hover-bg);
    border-color: var(--btn-hover-border);
    color: var(--btn-hover-text);
}

.reader-footer a.catalog-btn {
    background-color: var(--btn-primary-bg);
    color: #fff;
    border-color: var(--btn-primary-bg);
}

.reader-footer a.catalog-btn:hover {
    background-color: var(--btn-primary-hover);
    border-color: var(--btn-primary-hover);
}

.reader-footer a[aria-disabled="true"],
.nav-tool-bar a[aria-disabled="true"] {
    color: var(--text-muted);
    border-color: var(--border-color);
    background-color: transparent;
    opacity: 0.55;
    pointer-events: none;
}

.copyright {
    text-align: center;
    padding: 20px 0;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

/* === 阅读设置弹窗 === */
#reader-settings {
    border: none;
    border-radius: 8px;
    padding: 0;
    background-color: var(--bg-card);
    color: var(--text-body);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    width: 340px;
    max-width: 90vw;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin: 0;
}

#reader-settings::backdrop {
    background-color: rgba(0, 0, 0, 0.4);
}

.settings-panel {
    padding: 28px 32px;
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.settings-header h2 {
    font-size: 1.1rem;
    color: var(--text-title);
    font-weight: 700;
    margin: 0;
}

.settings-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.settings-group {
    margin-bottom: 20px;
}

.settings-group:last-child {
    margin-bottom: 0;
}

.settings-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

/* === 琴键按钮 === */
.segmented-control {
    display: inline-flex;
    border: 1px solid var(--btn-border);
    border-radius: 4px;
    overflow: hidden;
}

.segmented-control input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.segmented-control label {
    display: block;
    padding: 6px 20px;
    font-size: 0.9rem;
    color: var(--text-body);
    cursor: pointer;
    border-right: 1px solid var(--btn-border);
    transition: all 0.2s ease;
    user-select: none;
}

.segmented-control label:last-child {
    border-right: none;
}

.segmented-control input[type="radio"]:checked + label {
    color: #fff;
    background-color: var(--control-active-bg);
}

@media (max-width: 600px) {
    .top-nav {
        flex-wrap: wrap;
        gap: 8px;
        padding: 12px 0;
        margin-bottom: 20px;
    }

    .top-nav .chapter-info {
        order: -1;
        flex: 0 0 100%;
        text-align: center;
    }

    .reader-content {
        margin-left: -12px;
        margin-right: -12px;
        border-radius: 0;
        padding: 32px 20px;
    }

    .reader-content .chapter-title {
        font-size: 1.3rem;
        margin-bottom: 28px;
    }

    .reader-footer {
        flex-wrap: wrap;
        gap: 12px;
        padding: 28px 0 40px;
    }

    .reader-footer a {
        padding: 6px 18px;
        font-size: 0.9rem;
    }

    #reader-settings {
        width: 90vw;
    }

    .settings-panel {
        padding: 24px 20px;
    }

    .segmented-control label {
        padding: 6px 16px;
    }
}