.reader-main {
    min-height: calc(100vh - var(--header-height));
}

.site-header:not(.site-header-nav) {
    grid-template-columns: auto minmax(0, 1fr) auto;
}

.site-header .logo {
    display: flex;
    align-items: center;
}

.site-header .back-link {
    white-space: nowrap;
}

.reader-layout {
    display: flex;
    min-height: calc(100vh - var(--header-height));
}

.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    padding: 1.35rem;
    overflow-y: auto;
    position: fixed;
    right: 0;
    top: var(--header-height);
    bottom: 0;
    z-index: 900;
    transition: transform 0.3s ease;
}

.sidebar.hidden,
.sidebar[aria-hidden='true'] {
    transform: translateX(100%);
}

.part-selector {
    margin-bottom: 1rem;
}

.part-selector[hidden] {
    display: none;
}

.part-selector-title {
    font-size: var(--text-sm);
    color: var(--accent-color);
    margin-bottom: 0.6rem;
}

.part-selector-btn {
    width: 100%;
    text-align: right;
    margin-bottom: 0.5rem;
    background: var(--bg-elevated);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.55rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--text-sm);
    line-height: 1.7;
}

.part-selector-btn:hover,
.part-selector-btn.is-active {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.part-selector-btn.is-loading {
    opacity: 0.65;
}

.part-selector-btn.is-missing {
    opacity: 0.5;
    text-decoration: line-through;
}

.sidebar-title {
    font-size: var(--text-lg);
    color: var(--accent-color);
    margin-bottom: 1rem;
    padding-bottom: 0.55rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.sidebar-title svg {
    width: 1rem;
    height: 1rem;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

.chapter-list {
    list-style: none;
    counter-reset: chapter-counter;
}

.chapter-item {
    margin-bottom: 0.12rem;
}

.chapter-link {
    width: 100%;
    text-align: right;
    background: transparent;
    border: 0;
    padding: 0.72rem 0.85rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease;
    display: flex;
    align-items: baseline;
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    font-weight: 400;
    line-height: 1.8;
    color: #b9bfc9;
    cursor: pointer;
}

.chapter-link::before {
    counter-increment: chapter-counter;
    content: counter(chapter-counter) '. ';
    margin-left: 8px;
    color: var(--accent-color);
    font-weight: 700;
}

.chapter-link:hover,
.chapter-link.is-active {
    background-color: var(--hover-color);
    color: #fff;
}

.chapter-empty {
    color: var(--text-muted);
    font-size: var(--text-sm);
    padding: 0.8rem 0.3rem;
}

.reader-content {
    flex: 1;
    margin-right: 300px;
    padding: 3rem clamp(1rem, 7vw, 10%);
    font-size: clamp(1.18rem, 1.1rem + 0.4vw, 1.38rem);
    line-height: 2.1;
    text-align: justify;
    transition: margin-right 0.3s ease;
}

.reader-content.full-width {
    margin-right: 0;
    padding: 3rem clamp(1rem, 9vw, 15%);
}

.reader-page {
    min-height: 10rem;
}

.reader-page p {
    line-height: 2.35 !important;
    margin-bottom: 0.72rem;
}

.reader-page p:last-child {
    margin-bottom: 0;
}

.chapter-heading {
    color: var(--accent-color);
    text-align: center;
    margin: 2.5rem 0 1.8rem;
    font-size: clamp(1.5rem, 1.3rem + 0.8vw, 1.92rem);
    font-weight: 400;
    line-height: 1.65 !important;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.9rem;
}

.reader-page :where(h1, h2, h3, h4, h5, h6) {
    font-weight: 400;
}

.loading {
    text-align: center;
    margin-top: 4rem;
    font-size: var(--text-lg);
    line-height: 1.7;
    color: #838893;
}

.loading-spinner {
    width: 1.6rem;
    height: 1.6rem;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    display: block;
    margin: 0 auto 0.6rem;
    transform-origin: center;
    animation: readerSpin 1s linear infinite;
}

.loading-spinner circle {
    opacity: 0.3;
}

@keyframes readerSpin {
    to {
        transform: rotate(360deg);
    }
}

.reader-error {
    text-align: center;
    color: var(--danger-color);
    margin-top: 3rem;
    font-size: var(--text-sm);
    line-height: 1.75;
}

.search-overlay {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: 320px;
    background: var(--sidebar-bg);
    border-left: 1px solid var(--border-color);
    bottom: 0;
    z-index: 950;
    padding: 1.3rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.search-overlay.active,
.search-overlay[aria-hidden='false'] {
    transform: translateX(0);
}

.search-overlay-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.search-overlay-header h2 {
    font-size: var(--text-lg);
    line-height: 1.4;
}

.search-input {
    width: 100%;
    padding: 0.75rem;
    background: #080a0e;
    border: 1px solid var(--border-color);
    color: #fff;
    border-radius: var(--radius-sm);
    font-family: var(--font-ui);
    font-size: var(--text-sm);
    line-height: 1.5;
    margin-bottom: 0.9rem;
}

.search-hint {
    min-height: 1.2rem;
    margin: -0.28rem 0 0.8rem;
    color: var(--text-muted);
    font-size: var(--text-xs);
}

.search-results {
    max-height: calc(100vh - 210px);
    overflow-y: auto;
}

.search-result-item {
    background: #090c11;
    padding: 0.9rem;
    margin-bottom: 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--text-sm);
    line-height: 1.7;
    width: 100%;
    text-align: right;
    border: 1px solid transparent;
    color: var(--text-color);
    font-family: var(--font-ui);
    display: block;
    appearance: none;
}

.search-result-item:hover {
    background: var(--hover-color);
    border-color: var(--border-color);
}

.search-result-chapter {
    font-size: var(--text-xs);
    color: var(--accent-color);
    margin-bottom: 4px;
}

.search-result-empty {
    padding: 1rem;
    color: var(--text-muted);
    text-align: center;
    font-size: var(--text-sm);
}

.highlight {
    background-color: rgba(214, 173, 71, 0.42);
    color: #fff;
    padding: 0 2px;
    border-radius: 2px;
}

.page-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
    margin: 2rem 0 2.5rem;
    font-family: var(--font-ui);
    font-size: var(--text-sm);
}

.page-nav-center {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.page-btn {
    background: var(--sidebar-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.55rem 1rem;
    border-radius: 999px;
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: var(--text-sm);
}

.page-btn:hover:not(:disabled) {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.page-btn:disabled {
    opacity: 0.5;
    pointer-events: none;
}

.page-number-display {
    color: var(--accent-color);
    font-weight: 600;
    font-size: var(--text-sm);
}

.page-jump-input {
    width: 6.2rem;
    text-align: center;
    background: var(--sidebar-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding: 0.35rem 0.6rem;
    font-family: var(--font-ui);
    font-size: var(--text-sm);
}

.page-jump-input.is-valid {
    border-color: var(--accent-color);
}

.page-jump-input.is-invalid {
    border-color: var(--danger-color);
}

@media (max-width: 1100px) {
    .sidebar,
    .search-overlay {
        width: 280px;
    }

    .reader-content {
        margin-right: 280px;
        padding: 2.6rem 8%;
    }

    .reader-content.full-width {
        padding: 2.6rem 10%;
    }
}

@media (max-width: 900px) {
    .reader-layout {
        min-height: auto;
    }

    .sidebar {
        width: min(88vw, 320px);
        top: var(--header-height);
        padding: 1rem;
        box-shadow: -12px 0 28px rgba(0, 0, 0, 0.45);
    }

    .reader-content,
    .reader-content.full-width {
        margin-right: 0;
        padding: 1.8rem 1rem 2.4rem;
        font-size: 1.16rem;
        line-height: 2;
    }

    .reader-page p {
        line-height: 2.2 !important;
    }

    .chapter-heading {
        font-size: 1.52rem;
        margin: 1.9rem 0 1.4rem;
    }

    .search-overlay {
        width: min(92vw, 360px);
        top: var(--header-height);
        padding: 1rem;
        box-shadow: -12px 0 28px rgba(0, 0, 0, 0.45);
    }

    .search-results {
        max-height: calc(100vh - 190px);
    }

    .page-nav {
        margin: 1.8rem 0;
        gap: 0.7rem;
    }
}

@media (max-width: 640px) {
    .sidebar,
    .search-overlay {
        width: 100%;
        right: 0;
        border-left: none;
    }

    .reader-content,
    .reader-content.full-width {
        padding: 1.35rem 0.8rem 2rem;
        font-size: 1.08rem;
        line-height: 1.87;
    }

    .reader-page p {
        line-height: 2.05 !important;
    }

    .chapter-heading {
        font-size: 1.34rem;
        margin: 1.35rem 0 1rem;
        padding-bottom: 0.64rem;
    }

    .search-result-item {
        padding: 0.75rem;
    }

    .page-nav {
        flex-wrap: wrap;
        margin: 1.4rem 0 1.7rem;
    }

    .page-nav-center {
        width: 100%;
        justify-content: space-between;
        order: -1;
    }

    .page-btn {
        flex: 1 1 calc(50% - 0.5rem);
        text-align: center;
        padding: 0.5rem 0.75rem;
    }

    .page-jump-input {
        width: 4.8rem;
    }

}

@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }

    .reader-content {
        padding: 3.7rem 12%;
    }

    .reader-content.full-width {
        padding: 3.7rem 16%;
    }
}