/* =================== Reset =================== */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; padding: 0; }
[hidden] { display: none !important; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--fg);
    background: var(--bg);
    overflow: hidden;
}
body.login-page { overflow: auto; }
button { font: inherit; color: inherit; }
img { display: block; max-width: 100%; }
input, textarea, button, select { font: inherit; }
a { color: inherit; text-decoration: none; }

/* =================== Theme tokens =================== */
:root[data-theme="dark"] {
    --bg: var(--theme-dark-bg, #41393F);
    --bg-2: #4A4248;
    --bg-3: #554B52;
    --fg: var(--theme-dark-fg, #F4F4F4);
    --fg-dim: #c4bcc1;
    --fg-mute: #948990;
    --border: #5a4f57;
    --border-strong: #6e6168;
    --accent: #d6a25c;
    --accent-hover: #e6b471;
    --accent-fg: #1f1a1d;
    --danger: #ff8c8c;
    --success: #7fd1a7;
    --warning: #f1b96a;
    --shadow: 0 8px 24px rgba(0,0,0,.40);
    --card: #4A4248;
    --card-hover: #524750;
}
:root[data-theme="light"] {
    --bg: var(--theme-light-bg, #DCD7D1);
    --bg-2: #E8E3DD;
    --bg-3: #CFC9C2;
    --fg: var(--theme-light-fg, #000000);
    --fg-dim: #4a4540;
    --fg-mute: #80786f;
    --border: #c2bcb4;
    --border-strong: #a7a098;
    --accent: #8a5a2a;
    --accent-hover: #6f4720;
    --accent-fg: #FFFFFF;
    --danger: #b94a3c;
    --success: #2f7e5a;
    --warning: #9a5d00;
    --shadow: 0 4px 18px rgba(40, 30, 20, .12);
    --card: #E8E3DD;
    --card-hover: #efeae3;
}

/* =================== Layout =================== */
.app {
    display: grid;
    grid-template-columns: 240px 1fr;
    height: 100vh;
    width: 100vw;
}

.sidebar {
    background: var(--bg-2);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.main {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

/* =================== Sidebar =================== */
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 18px 18px 14px;
    border-bottom: 1px solid var(--border);
}
.brand-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px; height: 32px;
    border-radius: 8px;
    background: var(--accent);
    color: var(--accent-fg);
    font-weight: 700;
    font-size: 16px;
}
.brand-name {
    font-weight: 600;
    letter-spacing: .3px;
}

.nav {
    flex: 1;
    overflow-y: auto;
    padding: 10px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 8px;
    color: var(--fg-dim);
    cursor: pointer;
    transition: background .12s, color .12s;
}
.nav-item:hover { background: var(--bg-3); color: var(--fg); }
.nav-item.active { background: var(--bg-3); color: var(--fg); }
.nav-item[hidden] { display: none; }
.nav-icon {
    width: 20px; height: 20px;
    display: inline-flex;
    align-items: center; justify-content: center;
    font-size: 16px;
    opacity: .9;
}
.nav-label { font-size: 13.5px; display: inline-flex; align-items: center; gap: 6px; }
.nav-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 9px;
    background: var(--accent);
    color: var(--accent-fg);
    font-size: 11px;
    font-weight: 600;
    line-height: 1;
}

.sidebar-footer {
    padding: 10px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.footer-actions {
    display: flex;
    gap: 6px;
    align-items: center;
    justify-content: flex-end;
}
.footer-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--fg-dim);
    width: 30px; height: 30px;
    padding: 0;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    line-height: 1;
    transition: color .12s, border-color .12s, background .12s;
}
.footer-btn:hover {
    color: var(--fg);
    border-color: var(--border-strong);
    background: var(--bg-3);
}
.footer-btn .theme-icon { font-size: 14px; }

.user-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: var(--bg-3);
    border-radius: 10px;
}
.user-avatar {
    width: 30px; height: 30px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--accent-fg);
    font-weight: 600;
    display: inline-flex;
    align-items: center; justify-content: center;
    flex-shrink: 0;
}
.user-info {
    flex: 1;
    min-width: 0;
}
.user-name {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.user-role {
    font-size: 11px;
    color: var(--fg-mute);
}

/* =================== Topbar =================== */
.topbar {
    height: 56px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 16px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    flex-shrink: 0;
}
.menu-btn {
    display: none;
    width: 36px; height: 36px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    color: var(--fg);
}
.search-bar {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    max-width: 640px;
}
.search-bar input {
    flex: 1;
    height: 38px;
    padding: 0 36px 0 36px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--fg);
    outline: none;
    transition: border-color .12s, box-shadow .12s;
}
.search-bar input::placeholder { color: var(--fg-mute); }
.search-bar input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.search-bar::before {
    content: '⌕';
    position: absolute;
    left: 12px;
    color: var(--fg-mute);
    pointer-events: none;
}
.search-clear {
    position: absolute;
    right: 8px;
    background: transparent;
    border: none;
    color: var(--fg-mute);
    cursor: pointer;
    padding: 4px 8px;
    display: none;
}
.search-clear.visible { display: inline-block; }

/* Search suggestions (commands autocomplete) */
.search-suggestions {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: var(--shadow);
    z-index: 20;
    overflow: hidden;
    max-height: 340px;
    overflow-y: auto;
}
.search-suggestions[hidden] { display: none; }
.suggestion-item {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 14px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}
.suggestion-item:last-child { border-bottom: none; }
.suggestion-item:hover,
.suggestion-item.selected { background: var(--bg-3); }
.suggestion-cmd {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    font-size: 13px;
    color: var(--accent);
    flex-shrink: 0;
    min-width: 150px;
}
.suggestion-desc {
    font-size: 12.5px;
    color: var(--fg-dim);
}

.topbar-actions {
    display: flex;
    gap: 4px;
}

/* =================== Content =================== */
.content {
    flex: 1;
    overflow-y: auto;
    padding: 22px 28px 40px;
    position: relative;
}
.view-title {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 6px;
    letter-spacing: .2px;
}
.view-subtitle {
    color: var(--fg-dim);
    margin: 0 0 20px;
    font-size: 13.5px;
}
.view-toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--fg-mute);
}
.empty-state h3 {
    color: var(--fg-dim);
    margin: 0 0 6px;
    font-weight: 500;
}

/* =================== Buttons =================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--fg);
    cursor: pointer;
    transition: background .12s, border-color .12s;
    white-space: nowrap;
}
.btn:hover { background: var(--bg-3); border-color: var(--border-strong); }
.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-fg);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-danger {
    background: transparent;
    border-color: var(--danger);
    color: var(--danger);
}
.btn-danger:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); }
.btn-sm { padding: 4px 10px; font-size: 12.5px; }

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px; height: 32px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--fg-dim);
    cursor: pointer;
    transition: background .12s, color .12s, border-color .12s, opacity .12s, filter .12s;
}
.btn-icon:hover { background: var(--bg-3); color: var(--fg); border-color: var(--border); }
.btn-icon.active { color: var(--accent); }
.btn-icon:disabled { opacity: .35; cursor: not-allowed; }

/* Toggle-style icons: dim when inactive, bright when active. */
.btn-icon-toggle {
    opacity: .45;
    filter: grayscale(.75);
}
.btn-icon-toggle:hover {
    opacity: .9;
    filter: grayscale(.2);
}
.btn-icon-toggle.active {
    opacity: 1;
    filter: none;
    background: color-mix(in srgb, var(--accent) 18%, transparent);
    border-color: color-mix(in srgb, var(--accent) 32%, transparent);
    color: var(--accent);
}
.btn-icon-toggle.active:hover {
    background: color-mix(in srgb, var(--accent) 26%, transparent);
}
.btn-icon-toggle.danger.active {
    background: color-mix(in srgb, var(--danger) 20%, transparent);
    border-color: color-mix(in srgb, var(--danger) 38%, transparent);
    color: var(--danger);
}
.btn-icon-toggle.danger.active:hover {
    background: color-mix(in srgb, var(--danger) 30%, transparent);
}

/* =================== Grid & Book card =================== */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.book-card {
    display: flex;
    flex-direction: column;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: background .12s, border-color .12s, transform .12s;
}
.book-card:hover {
    background: var(--card-hover);
    border-color: var(--border-strong);
}
.book-card.blocked { opacity: .4; }

.book-top {
    display: flex;
    gap: 12px;
    padding: 12px;
}
.book-cover {
    width: 72px;
    height: 96px;
    flex-shrink: 0;
    background: var(--bg-3);
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
}
.book-cover img {
    width: 100%; height: 100%;
    object-fit: cover;
    animation: cover-fade-in .25s ease-out;
}
@keyframes cover-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}
.book-cover .placeholder {
    font-size: 28px;
    color: var(--fg-mute);
}
.book-cover:hover::after {
    content: '⟳ AI';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,.55);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
}

.book-info { flex: 1; min-width: 0; }
.book-title {
    font-size: 14.5px;
    font-weight: 600;
    margin: 0 0 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    cursor: pointer;
}
.book-title:hover { color: var(--accent); }
.book-authors {
    font-size: 12.5px;
    color: var(--fg-dim);
    margin-bottom: 3px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.book-authors a {
    cursor: pointer;
    border-bottom: 1px dashed transparent;
    transition: color .12s, border-color .12s;
}
.book-authors a:hover {
    color: var(--accent);
    border-bottom-color: color-mix(in srgb, var(--accent) 50%, transparent);
}
.book-year { font-size: 12px; color: var(--fg-mute); }

.book-desc {
    padding: 0 12px 10px;
    font-size: 12.5px;
    color: var(--fg-dim);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    cursor: pointer;
}
.book-desc:hover { color: var(--fg); }

.book-tags-row {
    padding: 0 12px 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: center;
}
.tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 6px 2px 8px;
    background: var(--bg-3);
    color: var(--fg-dim);
    border-radius: 10px;
    font-size: 11.5px;
    border: 1px solid var(--border);
}
.tag-chip .chip-x {
    cursor: pointer;
    color: var(--fg-mute);
    padding: 0 2px;
}
.tag-chip .chip-x:hover { color: var(--danger); }
.tag-input {
    background: transparent;
    border: 1px dashed var(--border);
    border-radius: 10px;
    padding: 1px 8px;
    font-size: 11.5px;
    outline: none;
    color: var(--fg);
    min-width: 80px;
    max-width: 140px;
}
.tag-input:focus { border-color: var(--accent); border-style: solid; }

.book-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    padding: 8px;
    border-top: 1px solid var(--border);
    background: var(--bg-2);
}

/* =================== Spinner =================== */
.view-loader {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--bg) 60%, transparent);
    backdrop-filter: blur(2px);
    z-index: 5;
}
.spinner {
    width: 28px; height: 28px;
    border: 2.5px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* =================== Modal =================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.55);
}
.modal-dialog {
    position: relative;
    background: var(--bg-2);
    color: var(--fg);
    border-radius: 14px;
    box-shadow: var(--shadow);
    max-width: 680px;
    width: calc(100% - 40px);
    max-height: 85vh;
    overflow-y: auto;
    padding: 24px 28px;
    border: 1px solid var(--border);
}
.modal-close {
    position: absolute;
    top: 12px; right: 12px;
    width: 32px; height: 32px;
    border: none;
    background: transparent;
    color: var(--fg-dim);
    cursor: pointer;
    border-radius: 8px;
    font-size: 16px;
}
.modal-close:hover { background: var(--bg-3); color: var(--fg); }

.desc-dialog { padding-top: 30px; }
.desc-cover {
    float: right;
    width: 120px;
    height: 160px;
    margin: 0 0 12px 16px;
    background: var(--bg-3);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.desc-cover img { width: 100%; height: 100%; object-fit: cover; }
.desc-title {
    font-size: 20px;
    margin: 0 0 6px;
}
.desc-authors {
    color: var(--fg-dim);
    margin-bottom: 4px;
    font-size: 13.5px;
}
.desc-meta { color: var(--fg-mute); font-size: 12px; margin-bottom: 14px; }
.desc-body {
    white-space: pre-wrap;
    line-height: 1.6;
    color: var(--fg);
    font-size: 14px;
}

.confirm-dialog { max-width: 420px; }
.confirm-dialog h3 { margin: 0 0 10px; font-weight: 600; }
.confirm-dialog p { margin: 0 0 18px; color: var(--fg-dim); }
.confirm-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* =================== Reader =================== */
.reader {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 200;
    display: flex;
    flex-direction: column;
}
.reader-topbar {
    height: 52px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 14px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.reader-title {
    flex: 1;
    margin: 0;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 10px;
    color: var(--fg-dim);
}
.reader-pager {
    display: flex;
    align-items: center;
    gap: 4px;
}
.reader-progress {
    font-size: 12px;
    color: var(--fg-mute);
    min-width: 60px;
    text-align: center;
}
.reader-tools {
    display: flex;
    gap: 2px;
}

.reader-body {
    flex: 1;
    display: flex;
    overflow: hidden;
}
.reader-toc {
    width: 300px;
    border-right: 1px solid var(--border);
    overflow-y: auto;
    background: var(--bg-2);
    padding: 14px 10px;
    transition: transform .2s;
}
.reader-toc.hidden { display: none; }
.reader-toc .toc-item {
    padding: 8px 10px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--fg-dim);
    font-size: 13px;
    line-height: 1.4;
}
.reader-toc .toc-item:hover { background: var(--bg-3); color: var(--fg); }
.reader-toc .toc-item.active {
    background: color-mix(in srgb, var(--accent) 18%, transparent);
    color: var(--fg);
}

.reader-page-wrap {
    flex: 1;
    position: relative;
    display: flex;
    min-width: 0;
}
.reader-page {
    flex: 1;
    overflow-y: auto;
    padding: 40px 60px 80px;
    min-width: 0;
}
.reader-page-inner {
    max-width: 720px;
    margin: 0 auto;
    font-size: var(--reader-font, 17px);
    line-height: 1.7;
    color: var(--fg);
    font-family: var(--reader-font-family, inherit);
}

/* Click-zones for page navigation: fixed inside .reader-page-wrap so they
   stay put while the article scrolls. No visual styling. */
.reader-clickzone {
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: 3;
    background: transparent;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}
.reader-clickzone-left { left: 0; width: 10%; }
.reader-clickzone-right { right: 0; width: 15%; }
.reader-page-inner h2 {
    font-size: 1.4em;
    font-weight: 600;
    margin: 1.4em 0 .6em;
}
.reader-page-inner h3 { font-size: 1.15em; font-weight: 500; margin: 1.2em 0 .5em; color: var(--fg-dim); }
.reader-page-inner p { margin: 0 0 1em; text-align: justify; text-indent: 1.5em; }
.reader-page-inner .epigraph { font-style: italic; color: var(--fg-dim); margin: 1.5em 2em; padding-left: 1em; border-left: 2px solid var(--border); }
.reader-page-inner .cite { margin: 1em 1.5em; color: var(--fg-dim); }
.reader-page-inner .poem { text-align: center; margin: 1.2em 0; }
.reader-page-inner .v { margin: .2em 0; }
.reader-page-inner em { font-style: italic; }
.reader-page-inner strong { font-weight: 600; }

/* =================== Toast =================== */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}
.toast {
    background: var(--bg-2);
    color: var(--fg);
    border: 1px solid var(--border-strong);
    border-left: 3px solid var(--accent);
    border-radius: 8px;
    padding: 10px 14px;
    box-shadow: var(--shadow);
    min-width: 220px;
    max-width: 360px;
    font-size: 13px;
    animation: toast-in .2s ease-out;
    pointer-events: auto;
}
.toast.toast-success { border-left-color: var(--success); }
.toast.toast-error { border-left-color: var(--danger); }
.toast.toast-warning { border-left-color: var(--warning); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } }

/* =================== Tables / Admin =================== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}
.data-table th {
    text-align: left;
    padding: 12px 14px;
    font-size: 12px;
    font-weight: 600;
    color: var(--fg-dim);
    text-transform: uppercase;
    letter-spacing: .5px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-2);
}
.data-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--card-hover); }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
}
.badge-active { background: color-mix(in srgb, var(--success) 20%, transparent); color: var(--success); }
.badge-newbie { background: color-mix(in srgb, var(--warning) 25%, transparent); color: var(--warning); }
.badge-banned { background: color-mix(in srgb, var(--danger) 20%, transparent); color: var(--danger); }
.badge-removed { background: var(--bg-3); color: var(--fg-mute); }
.badge-admin { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--accent); }

.row-actions { display: flex; gap: 4px; justify-content: flex-end; }

/* =================== Forms =================== */
.form-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 14px;
}
.form-row label {
    font-size: 12px;
    color: var(--fg-dim);
    font-weight: 500;
}
.form-row input,
.form-row select,
.form-row textarea {
    padding: 9px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--fg);
    outline: none;
    transition: border-color .12s;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

/* =================== Authors / Tags lists =================== */
.chip-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.chip-large {
    padding: 7px 14px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 999px;
    cursor: pointer;
    color: var(--fg);
    transition: background .12s, border-color .12s;
    font-size: 13px;
}
.chip-large:hover { background: var(--card-hover); border-color: var(--accent); color: var(--accent); }
.chip-large .chip-meta {
    color: var(--fg-mute);
    font-size: 11px;
    margin-left: 6px;
}

/* Admin table wrapper — horizontal scroll on narrow viewports */
.table-wrap {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 12px;
}

/* Sidebar backdrop (hidden on desktop) */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 45;
    background: rgba(0, 0, 0, .45);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s;
}

/* =================== Tablet / Mobile =================== */
@media (max-width: 768px) {
    .app { grid-template-columns: 1fr; }
    .sidebar {
        position: fixed;
        top: 0; left: 0;
        width: 280px;
        height: 100%;
        z-index: 50;
        transform: translateX(-100%);
        transition: transform .2s;
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-backdrop { display: block; }
    body.sidebar-open .sidebar-backdrop { opacity: 1; pointer-events: auto; }

    .menu-btn { display: inline-flex; align-items: center; justify-content: center; }
    .topbar { padding: 0 10px; gap: 6px; }
    .topbar-actions { gap: 2px; }
    .content { padding: 16px 14px 36px; }

    /* Prevent iOS auto-zoom on focus */
    input[type="text"], input[type="search"], input[type="password"],
    input[type="email"], select, textarea { font-size: 16px; }
    .search-bar input { font-size: 16px; }
    .form-row input, .form-row select, .form-row textarea { font-size: 16px; }

    /* Touch-friendlier buttons */
    .btn { padding: 9px 14px; }
    .btn-icon { width: 36px; height: 36px; }

    /* Books grid */
    .books-grid { grid-template-columns: 1fr; gap: 12px; }
    .book-card { border-radius: 10px; }
    .book-actions { gap: 4px; padding: 6px; }

    /* Reader */
    .reader-topbar { padding: 0 8px; gap: 4px; }
    .reader-title { font-size: 13px; padding: 0 6px; }
    .reader-progress { min-width: 44px; font-size: 11px; }
    .reader-page { padding: 20px 16px 60px; }
    .reader-toc { position: absolute; inset: 52px 0 0 0; width: 100%; z-index: 5; }
    .reader-toc.hidden { display: none; }

    /* Modals */
    .modal-dialog { padding: 20px 20px; max-height: calc(100vh - 24px); }
    .desc-cover { float: none; margin: 0 0 14px; width: 100%; height: 220px; }

    /* Admin table — let it scroll horizontally inside the wrap */
    .data-table { min-width: 620px; }
    .data-table th, .data-table td { padding: 10px 12px; font-size: 13px; }
    .row-actions { gap: 2px; }

    /* Chips — slightly larger for touch */
    .chip-large { padding: 8px 14px; font-size: 13.5px; }

    /* Search autocomplete dropdown fits viewport */
    .search-suggestions { max-height: 60vh; }
    .suggestion-cmd { min-width: 120px; font-size: 12.5px; }
    .suggestion-desc { font-size: 12px; }
}

/* =================== Phone portrait =================== */
@media (max-width: 420px) {
    .topbar { height: 52px; padding: 0 8px; }
    .search-bar input { padding: 0 32px 0 32px; height: 36px; }
    .content { padding: 14px 12px 32px; }

    .view-title { font-size: 19px; }
    .view-toolbar { gap: 6px; }

    /* Reader — hide title to keep controls on one line on narrow phones */
    .reader-title { display: none; }
    .reader-topbar { height: 48px; }

    /* Book card — compact */
    .book-top { padding: 10px; gap: 10px; }
    .book-cover { width: 64px; height: 86px; }
    .book-title { font-size: 14px; }
    .book-authors { font-size: 12px; }
    .book-desc { padding: 0 10px 8px; font-size: 12px; }
    .book-tags-row { padding: 0 10px 8px; }

    /* Modals: use most of the viewport */
    .modal-dialog { width: calc(100% - 16px); padding: 18px 16px; border-radius: 12px; }
    .suggestion-cmd { min-width: 100px; }
}

/* =================== Desktop-only refinements =================== */
@media (min-width: 1200px) {
    .content { padding: 26px 36px 48px; }
    .books-grid { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
}
@media (min-width: 1600px) {
    .books-grid { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }

/* Login page */
.login-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    background: var(--bg);
}
.login-card {
    width: 100%;
    max-width: 380px;
    padding: 30px 28px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow);
}
.login-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    margin-bottom: 22px;
    font-size: 17px;
    font-weight: 600;
}
.login-title {
    text-align: center;
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 20px;
}
.login-card .form-row { margin-bottom: 14px; }
.login-card .btn {
    width: 100%;
    justify-content: center;
    padding: 11px 14px;
    margin-top: 4px;
}
.login-toggle {
    text-align: center;
    margin-top: 16px;
    color: var(--fg-dim);
    font-size: 13px;
}
.login-toggle a { color: var(--accent); cursor: pointer; }
.login-toggle a:hover { text-decoration: underline; }
.login-message {
    margin-top: 10px;
    font-size: 12.5px;
    min-height: 18px;
}
.login-message.error { color: var(--danger); }
.login-message.success { color: var(--success); }

/* =================== Feedback admin =================== */
.feedback-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 8px;
}
.feedback-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.feedback-card.unread { border-color: var(--accent); }
.feedback-card.important { box-shadow: inset 4px 0 0 var(--warning); }
.feedback-head {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    font-size: 12.5px;
    color: var(--fg-dim);
    flex-wrap: wrap;
}
.feedback-user { color: var(--fg); font-weight: 500; }
.feedback-text {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 14px;
    line-height: 1.5;
    color: var(--fg);
}
.feedback-actions {
    display: flex;
    gap: 6px;
    justify-content: flex-end;
    flex-wrap: wrap;
}
.feedback-filters {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.feedback-filters label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--fg-dim);
    cursor: pointer;
}

/* =================== Settings modal =================== */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 16px;
    margin: 8px 0 16px;
}
.settings-grid .form-row { margin: 0; }
.settings-grid .form-row.full { grid-column: 1 / -1; }
.settings-grid label { font-size: 12px; color: var(--fg-dim); display: block; margin-bottom: 4px; }
.settings-grid input[type="text"],
.settings-grid input[type="number"],
.settings-grid select {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 6px;
}
.color-row {
    display: flex;
    align-items: center;
    gap: 8px;
}
.color-row input[type="color"] {
    width: 36px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    cursor: pointer;
}
.color-row input[type="text"] {
    flex: 1;
    font-family: monospace;
    font-size: 12px;
}
.color-row .btn-icon {
    width: 32px; height: 32px;
}
.settings-section-title {
    grid-column: 1 / -1;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--fg-mute);
    margin: 4px 0 -4px;
}
@media (max-width: 480px) {
    .settings-grid { grid-template-columns: 1fr; }
}