/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #7C3AED;
    --color-primary-dark: #6D28D9;
    --color-primary-light: #8B5CF6;
    --color-bg: #FAFAF9;
    --color-text: #1C1917;
    --color-text-secondary: #78716C;
    --color-highlight: #FEF3C7;
    --color-discussion-bg: #F5F3FF;
    --color-border: #E7E5E4;
    --color-white: #FFFFFF;
    --color-danger: #DC2626;
    --color-danger-dark: #B91C1C;
    --color-success: #16A34A;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.1);
    --reader-font-size: 1.125rem;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== Navbar ===== */
.navbar {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.navbar-brand:hover {
    color: var(--color-primary-dark);
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.navbar-link {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.navbar-link:hover {
    color: var(--color-primary);
}

.navbar-logout {
    color: var(--color-danger);
}

.navbar-member {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s;
    text-decoration: none;
    line-height: 1.4;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-danger {
    background-color: var(--color-danger);
    color: var(--color-white);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background-color: var(--color-danger-dark);
}

.btn-sm {
    padding: 0.25rem 0.625rem;
    font-size: 0.8125rem;
}

.btn-xs {
    padding: 0.125rem 0.5rem;
    font-size: 0.75rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* ===== Profile Circle ===== */
.profile-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.profile-circle-sm {
    width: 20px;
    height: 20px;
    font-size: 0.625rem;
}

.profile-circles {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

/* ===== Cards ===== */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
}

/* ===== Alerts ===== */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.alert-error {
    background-color: #FEF2F2;
    color: var(--color-danger);
    border: 1px solid #FECACA;
}

.alert-success {
    background-color: #F0FDF4;
    color: var(--color-success);
    border: 1px solid #BBF7D0;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-family: var(--font-sans);
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.15);
}

.form-inline {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.form-inline .form-group {
    margin-bottom: 0;
}

.inline-form {
    display: inline;
}

/* ===== Login ===== */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--color-bg);
}

.login-card {
    background-color: var(--color-white);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 380px;
    margin: 1rem;
}

.login-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.login-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.login-form .btn {
    margin-top: 0.5rem;
}

/* ===== Book List ===== */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.section-header h1 {
    font-size: 1.5rem;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1.25rem;
}

.book-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.15s, box-shadow 0.15s;
    text-decoration: none;
    color: var(--color-text);
}

.book-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--color-text);
}

.book-cover {
    aspect-ratio: 2 / 3;
    overflow: hidden;
    background-color: #F5F3FF;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-dark));
    color: var(--color-white);
    font-size: 2.5rem;
    font-weight: 700;
}

.book-info {
    padding: 0.75rem;
}

.book-title {
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* ===== Dashboard ===== */
.dashboard-header {
    margin-bottom: 1.5rem;
}

.dashboard-header h1 {
    font-size: 1.5rem;
}

.dashboard-author {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

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

.chapter-item a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    transition: color 0.15s;
}

.chapter-item:last-child a {
    border-bottom: none;
}

.chapter-item a:hover {
    color: var(--color-primary);
}

.chapter-seq {
    font-weight: 600;
    color: var(--color-primary);
    min-width: 2rem;
}

/* ===== Dashboard: Hot Discussions & Popular Sentences ===== */
.discussion-list,
.popular-list,
.activity-list {
    list-style: none;
}

.discussion-item,
.popular-item,
.activity-item {
    border-bottom: 1px solid var(--color-border);
}

.discussion-item:last-child,
.popular-item:last-child,
.activity-item:last-child {
    border-bottom: none;
}

.discussion-link,
.popular-link,
.activity-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    color: var(--color-text);
    text-decoration: none;
    transition: background-color 0.15s;
}

.activity-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
}

.discussion-link:hover,
.popular-link:hover,
.activity-link:hover {
    color: var(--color-primary);
}

.popular-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
}

.discussion-info {
    flex: 1;
    min-width: 0;
}

.discussion-sentence-text,
.popular-sentence-text {
    font-size: 0.8125rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0.25rem;
}

.discussion-chapter-name {
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
}

.comment-count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 0.375rem;
    border-radius: 12px;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.popular-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.popular-highlighters {
    display: flex;
    gap: 0.125rem;
    flex-wrap: wrap;
}

.highlight-count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 0.375rem;
    border-radius: 11px;
    background-color: #F59E0B;
    color: var(--color-white);
    font-size: 0.6875rem;
    font-weight: 600;
    flex-shrink: 0;
}

/* Activity */
.activity-header {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.activity-member {
    font-size: 0.8125rem;
    font-weight: 600;
}

.activity-type-badge {
    font-size: 0.6875rem;
    padding: 0.0625rem 0.375rem;
    border-radius: 8px;
    font-weight: 500;
}

.activity-type-highlight {
    background-color: #FEF3C7;
    color: #92400E;
}

.activity-type-comment {
    background-color: #EDE9FE;
    color: #5B21B6;
}

.activity-type-memo {
    background-color: #DBEAFE;
    color: #1E40AF;
}

.activity-content {
    font-size: 0.8125rem;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.activity-sentence {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-style: italic;
}

/* ===== Reader: Comment Bubble ===== */
.comment-bubble {
    display: inline-flex;
    align-items: center;
    gap: 0.125rem;
    margin-left: 0.125rem;
    vertical-align: middle;
    color: var(--color-primary);
    cursor: pointer;
    font-size: 0.75rem;
}

.comment-bubble svg {
    vertical-align: middle;
}

.comment-bubble-count {
    font-size: 0.6875rem;
    font-weight: 600;
}

/* ===== Book Images (킨들 스타일 + 모달) ===== */
.book-image {
    display: block;
    text-align: center;
    margin: 0.5em 0;
    break-inside: avoid;
    page-break-inside: avoid;
}

/* 연속 이미지는 새 페이지(column)로 분리 — 킨들 방식 */
.book-image + .book-image {
    break-before: column;
    page-break-before: column;
}

.book-image img {
    max-height: 40vh;
    height: auto;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    cursor: zoom-in;
    transition: box-shadow 0.2s;
}

.book-image img:hover {
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.3);
}

.book-image figcaption {
    font-size: 0.8em;
    color: var(--color-text-secondary);
    margin-top: 0.3em;
}

/* 이미지 모달 */
.image-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    cursor: zoom-out;
    justify-content: center;
    align-items: center;
}

.image-modal-overlay.active {
    display: flex;
}

.image-modal-content {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
}

.image-modal-caption {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    font-size: 0.9rem;
    background: rgba(0, 0, 0, 0.6);
    padding: 0.4rem 1rem;
    border-radius: 4px;
    max-width: 80vw;
    text-align: center;
}

.image-modal-close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    background: none;
    border: none;
    line-height: 1;
}

.book-image figcaption {
    font-size: 0.85em;
    color: #78716c;
    margin-top: 0.5em;
}

/* ===== Reader ===== */
.reader-section {
    position: relative;
}

.reader-header {
    margin-bottom: 1.5rem;
}

.reader-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.reader-title {
    text-align: center;
    flex: 1;
}

.reader-title h1 {
    font-size: 1.25rem;
    margin-bottom: 0.125rem;
}

.reader-book-title {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.reader-toolbar {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.reader-body {
    max-width: 700px;
    margin: 0 auto;
    font-size: var(--reader-font-size, 1.125rem);
    line-height: 1.8;
    padding: 1rem 2rem;
    box-sizing: border-box;
}

.sentence {
    cursor: pointer;
    transition: background-color 0.15s;
    border-radius: 2px;
}

.sentence:hover {
    background-color: rgba(124, 58, 237, 0.06);
}

.sentence.highlighted {
    background-color: var(--color-highlight);
}

.sentence.active {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

/* ===== Social Layer ===== */
.social-layer {
    display: inline-flex;
    align-items: center;
    gap: 0.125rem;
    margin-left: 0.15rem;
    margin-right: 0.3rem;
    vertical-align: middle;
    background: #f5f3ff;
    border-radius: 10px;
    padding: 0 0.3rem;
    font-size: 0.8em;
}

.social-hidden {
    display: none;
}

.discussion-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: 0.625rem;
    font-weight: 700;
}

/* ===== Discussion Panel ===== */
.discussion-panel {
    position: fixed;
    right: 0;
    top: 57px;
    bottom: 0;
    width: 400px;
    max-width: 100%;
    background-color: var(--color-discussion-bg);
    border-left: 1px solid var(--color-border);
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.08);
    overflow-y: auto;
    z-index: 90;
    transition: transform 0.25s ease;
}

.discussion-hidden {
    transform: translateX(100%);
}

.discussion-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-white);
    position: sticky;
    top: 0;
}

.discussion-panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.discussion-panel-body {
    padding: 1rem 1.25rem;
}

/* Discussion Detail */
.discussion-sentence blockquote {
    background-color: var(--color-white);
    border-left: 3px solid var(--color-primary);
    padding: 0.75rem 1rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.discussion-highlighters {
    margin-bottom: 1rem;
}

.discussion-highlighters h4,
.discussion-memos h4,
.discussion-comments h4 {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

/* Memos */
.memo-list {
    list-style: none;
    margin-bottom: 1rem;
}

.memo-item {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.memo-content {
    flex: 1;
}

.memo-author {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.memo-content p {
    font-size: 0.875rem;
    margin-top: 0.125rem;
}

/* Comments */
.comment-list {
    list-style: none;
    margin-bottom: 1rem;
}

.comment-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
}

.comment-header {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    margin-bottom: 0.375rem;
}

.comment-author {
    font-size: 0.8125rem;
    font-weight: 600;
}

.comment-time {
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
    margin-left: auto;
}

.comment-actions {
    display: flex;
    gap: 0.25rem;
    margin-left: 0.5rem;
}

.comment-body p {
    font-size: 0.875rem;
    line-height: 1.5;
}

.comment-edit-form {
    margin-top: 0.5rem;
}

.comment-edit-form textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    resize: vertical;
    min-height: 60px;
}

.comment-edit-hidden {
    display: none;
}

.comment-edit-actions {
    display: flex;
    gap: 0.375rem;
    margin-top: 0.375rem;
}

.comment-form textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    resize: vertical;
    min-height: 80px;
    margin-bottom: 0.5rem;
}

.comment-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.15);
}

/* ===== Admin ===== */
.admin-section h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.625rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
}

.table th {
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: 0.8125rem;
}

.table tbody tr:hover {
    background-color: rgba(124, 58, 237, 0.03);
}

.upload-form {
    max-width: 480px;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 2fr 1fr;
    }

    .book-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 767px) {
    .reader-body {
        padding: 0.75rem 1rem;
    }

    .reader-nav {
        flex-wrap: wrap;
    }

    .reader-title {
        order: -1;
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .navbar-menu {
        gap: 0.5rem;
        font-size: 0.8125rem;
    }

    /* Discussion panel as bottom sheet on mobile */
    .discussion-panel {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        top: auto;
        width: 100%;
        max-height: 70vh;
        border-left: none;
        border-top: 1px solid var(--color-border);
        border-radius: var(--radius) var(--radius) 0 0;
    }

    .discussion-hidden {
        transform: translateY(100%);
    }

    .form-inline {
        flex-direction: column;
        align-items: stretch;
    }
}

/* 번역문 */
.translation {
    display: block;
    color: #6B4C9A;
    font-size: 0.9em;
    line-height: 1.6;
    margin: 0.15em 0 0.4em 0;
    padding-left: 0.8em;
    border-left: 2px solid #D8B4FE;
}
.translation-hidden {
    display: none;
}
.btn-active {
    background-color: #7C3AED;
    color: #fff;
    border-color: #7C3AED;
}

/* ===== Kindle-style Pagination ===== */
.reader-viewport {
    position: relative;
    overflow-y: hidden;
    overflow-x: hidden;
    height: calc(100vh - 160px);
    height: calc(100dvh - 160px);
    margin: 0 auto;
    max-width: 800px;
}


/* 좌우 페이지 버튼 */
.page-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 10;
}
.reader-viewport:hover .page-nav { opacity: 1; }
.page-prev { left: 0.5rem; }
.page-next { right: 0.5rem; }
.page-nav:disabled { opacity: 0.2; cursor: default; }

/* 모바일 탭 영역 (좌우 페이지 네비게이션) */
.tap-zone {
    position: absolute;
    top: 0;
    height: 100%;
    z-index: 5;
    display: none; /* PC에서는 숨김 */
}
.tap-zone-prev {
    left: 0;
    width: 25%;
}
.tap-zone-next {
    right: 0;
    width: 25%;
}

/* 페이지 인디케이터 */
.page-indicator {
    text-align: center;
    padding: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-border);
}

/* 토론 패널 열림 시 뷰포트 축소 */
.reader-viewport.with-panel {
    max-width: calc(100% - 420px);
}

/* 모바일 페이지네이션 */
@media (max-width: 768px) {
    .reader-viewport {
        height: calc(100vh - 120px);
        height: calc(100dvh - 120px);
    }
    .page-nav { display: none; } /* PC용 버튼은 모바일에서 숨김 */
    .tap-zone { display: block; } /* 모바일에서는 탭 영역 표시 */
    :root { --reader-font-size: 1rem; }
}

/* ===== sentence-group wrapper ===== */
.sentence-group {
    display: inline;
}

/* ===== Bookmarks ===== */
/* 페이지 북마크 (우측 상단 모서리) */
.page-bookmark {
    position: absolute;
    top: 0;
    right: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.25rem;
    color: #d6d3d1;
    transition: color 0.2s;
    z-index: 10;
}
.page-bookmark:hover {
    color: #a8a29e;
}
.page-bookmark.bookmarked {
    color: #7C3AED;
}
.page-bookmark.bookmarked svg {
    fill: #7C3AED;
}

.bookmark-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 380px;
    height: 100vh;
    background: #fff;
    box-shadow: -2px 0 12px rgba(0,0,0,0.1);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s;
}
.bookmark-hidden {
    transform: translateX(100%);
}
.bookmark-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #e5e5e5;
}
.bookmark-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}
.bookmark-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.bookmark-item {
    border-bottom: 1px solid #f0f0f0;
    padding: 0.75rem 0;
}
.bookmark-link {
    text-decoration: none;
    color: inherit;
    display: block;
}
.bookmark-link:hover {
    background: #f5f3ff;
    border-radius: 4px;
    padding: 0.25rem;
    margin: -0.25rem;
}
.bookmark-chapter {
    font-size: 0.75rem;
    color: #7C3AED;
    font-weight: 600;
}
.bookmark-content {
    font-size: 0.875rem;
    color: #44403c;
    margin: 0.25rem 0 0;
    line-height: 1.4;
}
.bookmark-delete {
    margin-top: 0.5rem;
}
.bookmark-time {
    font-size: 0.75rem;
    color: #a8a29e;
    display: block;
    margin-top: 0.25rem;
}

@media (max-width: 768px) {
    .bookmark-panel {
        width: 100%;
        top: auto;
        bottom: 0;
        height: 60vh;
        border-radius: 12px 12px 0 0;
    }
    .bookmark-hidden {
        transform: translateY(100%);
    }
}