:root {
    --bg-body: #f3f3f8; /* iOS system background */
    --bg-glass: rgba(255, 255, 255, 0.75);
    --bg-card: #ffffff;
    --bg-hover: rgba(0, 0, 0, 0.05);
    --border: rgba(0, 0, 0, 0.08);
    --text-main: #1c1c1e;
    --text-muted: #8e8e93;
    --accent: #007aff;
    --accent-bg: rgba(0, 122, 255, 0.1);
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --blur: blur(20px) saturate(180%);
    --header-h: 60px;
    --sidebar-w: 260px;
    --toc-w: 220px;
}

.dark {
    --bg-body: #000000;
    --bg-glass: rgba(28, 28, 30, 0.75);
    --bg-card: #1c1c1e;
    --bg-hover: rgba(255, 255, 255, 0.1);
    --border: rgba(255, 255, 255, 0.1);
    --text-main: #f2f2f7;
    --text-muted: #98989d;
    --accent: #0a84ff;
    --accent-bg: rgba(10, 132, 255, 0.15);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* View Transitions (Theme Toggle) */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

/* Base styles for the dark mode transition (expanding circle from pointer) */
::view-transition-new(root) {
  z-index: 1000 !important;
}
::view-transition-old(root) {
  z-index: 1 !important;
}

/* Light mode transition: invert z-index so old (dark) view collapses */
.transition-light-mode::view-transition-old(root) {
  z-index: 1000 !important;
}
.transition-light-mode::view-transition-new(root) {
  z-index: 1 !important;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

/* Site-wide scrollbar: hidden on page chrome; code blocks & tables always show */
html,
body,
.sidebar,
.toc,
.main-wrapper,
.content-card,
.prose,
.embed-wrapper,
.pagination-link {
    scrollbar-width: none;
    -ms-overflow-style: none;
}

html::-webkit-scrollbar,
body::-webkit-scrollbar,
.sidebar::-webkit-scrollbar,
.toc::-webkit-scrollbar,
.main-wrapper::-webkit-scrollbar,
.content-card::-webkit-scrollbar,
.prose::-webkit-scrollbar,
.embed-wrapper::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;
    background: transparent;
}

.sidebar:hover,
.toc:hover {
    scrollbar-width: thin;
    scrollbar-color: rgba(128, 128, 128, 0.12) transparent;
}
.dark .sidebar:hover,
.dark .toc:hover {
    scrollbar-color: rgba(255, 255, 255, 0.08) transparent;
}
.sidebar:hover::-webkit-scrollbar,
.toc:hover::-webkit-scrollbar {
    width: 6px;
    height: 6px;
    display: block;
}
.sidebar:hover::-webkit-scrollbar-thumb,
.toc:hover::-webkit-scrollbar-thumb {
    background: rgba(128, 128, 128, 0.12);
    border-radius: 6px;
}
.dark .sidebar:hover::-webkit-scrollbar-thumb,
.dark .toc:hover::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
}
.sidebar:hover::-webkit-scrollbar-track,
.toc:hover::-webkit-scrollbar-track {
    background: transparent;
}

/* Code blocks & wide tables: scrollbar always visible */
.prose .table-scroll,
.prose pre,
.code-copy-wrapper pre {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.22) rgba(255, 255, 255, 0.06);
}
.prose .table-scroll {
    scrollbar-color: rgba(128, 128, 128, 0.35) transparent;
}
.dark .prose .table-scroll {
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}
.prose .table-scroll::-webkit-scrollbar,
.prose pre::-webkit-scrollbar,
.code-copy-wrapper pre::-webkit-scrollbar {
    width: 8px;
    height: 8px;
    display: block;
}
.prose .table-scroll::-webkit-scrollbar-track,
.prose pre::-webkit-scrollbar-track,
.code-copy-wrapper pre::-webkit-scrollbar-track {
    background: transparent;
}
.prose pre::-webkit-scrollbar-thumb,
.code-copy-wrapper pre::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.22);
    border-radius: 8px;
    border: 2px solid transparent;
    background-clip: padding-box;
}
.prose pre::-webkit-scrollbar-thumb:hover,
.code-copy-wrapper pre::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.35);
    background-clip: padding-box;
}
.prose .table-scroll::-webkit-scrollbar-thumb {
    background: rgba(128, 128, 128, 0.35);
    border-radius: 8px;
}
.dark .prose .table-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
}
.prose .table-scroll::-webkit-scrollbar-thumb:hover {
    background: rgba(128, 128, 128, 0.5);
}
.dark .prose .table-scroll::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.32);
}

body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

.glass {
    background-color: var(--bg-glass);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
}

/* Header */
.header {
    position: fixed; top: 0; left: 0; right: 0; height: var(--header-h);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 1.5rem; z-index: 100;
    border-bottom: 1px solid var(--border);
}
.header-logo { font-weight: 600; font-size: 1.1rem; color: var(--text-main); display: flex; align-items: center; gap: 8px; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.icon-btn { 
    background: transparent; border: none; color: var(--text-main); 
    width: 36px; height: 36px; border-radius: var(--radius-sm); 
    display: flex; align-items: center; justify-content: center; cursor: pointer;
    transition: background 0.2s;
}
.icon-btn:hover { background: var(--bg-hover); }
.menu-btn { display: none; }

/* Layout */
.app-container { display: flex; padding-top: var(--header-h); min-height: 100vh; }

/* Sidebar Navigation Groups (GitHub style) */
.nav-group { margin-bottom: 0.5rem; }
.nav-group-toggle {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 0.25rem 0 0.75rem; border-radius: var(--radius-sm);
    color: var(--text-main); transition: background-color 0.2s;
    user-select: none;
}
.nav-group-toggle:hover { background-color: var(--bg-hover); }
.nav-chevron { width: 16px; height: 16px; transition: transform 0.2s ease; opacity: 0.6; }
.nav-group.expanded .nav-chevron { transform: rotate(180deg); }

.nav-group-link {
    flex: 1;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.5rem 0;
}
.nav-group-link:hover { color: var(--accent); }
.nav-group-link.active { color: var(--accent); }

.nav-group-icon {
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
    transition: opacity 0.2s;
    border-radius: var(--radius-sm);
    cursor: pointer;
}
.nav-group-icon:hover {
    background-color: var(--bg-hover);
    opacity: 1;
}

.nav-group-content {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease-out;
}
.nav-group.expanded .nav-group-content {
    grid-template-rows: 1fr;
}
.nav-group-inner {
    overflow: hidden;
    padding-left: 1rem;
    margin-left: 0.75rem;
    border-left: 1px solid var(--border);
    margin-top: 0.25rem;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.nav-group-inner .nav-link {
    margin-bottom: 0;
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.nav-group-inner .nav-link:hover {
    color: var(--text-main);
    background: var(--bg-hover);
    padding-left: 0.75rem; /* override the global hover to keep it clean */
}
.nav-group-inner .nav-link.active {
    color: var(--accent);
    background: transparent;
    font-weight: 600;
    box-shadow: none; /* override global active */
}
.nav-group-inner .nav-link.active::before {
    content: '';
    position: absolute;
    left: -1px; /* perfectly overlay on the parent border */
    top: 0; bottom: 0;
    width: 2px;
    background: var(--accent);
    border-radius: 2px;
}
.nav-group-inner .nav-link { position: relative; } /* needed for the active pseudo element */
.sidebar {
    width: var(--sidebar-w); position: fixed; top: var(--header-h); bottom: 0; left: 0;
    border-right: 1px solid var(--border); padding: 2rem 1rem; overflow-y: auto; z-index: 100;
    background: var(--bg-body);
}
.nav-section { margin-bottom: 2rem; }
.nav-title { font-size: 0.75rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.75rem; padding-left: 0.75rem; }
.nav-link { 
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.5rem 0.75rem; color: var(--text-main); font-size: 0.95rem;
    border-radius: var(--radius-md); transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); margin-bottom: 4px;
    font-weight: 500;
}
.nav-link:hover { background-color: var(--bg-hover); padding-left: 1rem; }
.nav-link.active { background-color: var(--accent-bg); color: var(--accent); font-weight: 600; box-shadow: inset 3px 0 0 var(--accent); }

/* Main Content */
.main-wrapper { 
    flex: 1; margin-left: var(--sidebar-w); margin-right: var(--toc-w); 
    padding: 2rem; max-width: 900px; margin-inline: auto; width: 100%;
}
.main-wrapper.no-toc { margin-right: 0; margin-inline: auto; max-width: 1000px; }
.main-wrapper.no-sidebar { margin-left: 0; margin-right: 0; max-width: 1000px; }

.content-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 3rem;
    border: 1px solid var(--border);
}

/* TOC */
.toc {
    width: var(--toc-w); position: fixed; top: var(--header-h); bottom: 0; right: 0;
    padding: 2rem 1.5rem; overflow-y: auto;
}
.toc-title { font-size: 0.75rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 1rem; padding-left: 0.5rem; }
.toc-link { 
    display: block; font-size: 0.85rem; color: var(--text-muted); padding: 0.4rem 0.5rem;
    border-left: 2px solid transparent; transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.toc-link:hover { color: var(--text-main); background: var(--bg-hover); }
.toc-link.active { color: var(--accent); border-left-color: var(--accent); background: var(--accent-bg); font-weight: 500; }

/* Markdown Styles */
.prose { font-size: 1rem; line-height: 1.7; color: var(--text-main); word-wrap: break-word; overflow-wrap: break-word; word-break: break-word; }
.prose h1, .prose h2, .prose h3, .prose h4, .prose h5, .prose h6 { position: relative; }
.prose h1 { font-size: 2rem; font-weight: 700; margin-bottom: 1.5rem; letter-spacing: -0.02em; }
.prose h2 { font-size: 1.5rem; font-weight: 600; margin-top: 2.5rem; margin-bottom: 1rem; letter-spacing: -0.01em; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.prose h3 { font-size: 1.25rem; font-weight: 600; margin-top: 2rem; margin-bottom: 0.75rem; }
.prose h4 { font-size: 1.1rem; font-weight: 600; margin-top: 1.5rem; margin-bottom: 0.5rem; }
.prose p { margin-bottom: 1.25rem; color: var(--text-main); }
.prose strong { font-weight: 600; color: var(--text-main); }
.prose em { font-style: italic; }
.prose del { text-decoration: line-through; color: var(--text-muted); }
.prose code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 0.85em; background: var(--bg-hover); padding: 0.2em 0.4em; border-radius: 6px; color: var(--accent); }

/* Tables */
.prose .table-scroll { width: 100%; overflow-x: auto; margin: 1.5rem 0; -webkit-overflow-scrolling: touch; }
.prose .embed-wrapper { line-height: 0; }
.prose .embed-wrapper iframe { display: block; width: 100%; border: 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 280px; }
.prose th { text-align: left; padding: 0.65rem 1rem; border-bottom: 2px solid var(--border); font-weight: 600; font-size: 0.85rem; color: var(--text-muted); white-space: nowrap; }
.prose td { padding: 0.65rem 1rem; border-bottom: 1px solid var(--border); }
.prose tr:last-child td { border-bottom: none; }
.prose tr:hover td { background: var(--bg-hover); }
.prose th code, .prose td code { font-size: 0.85em; }

/* Task lists */
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose ul, .prose ol { margin-bottom: 1.25rem; padding-left: 1.5rem; }
.prose li { margin-bottom: 0.5rem; }
.prose li p { margin-bottom: 0.5rem; }
.prose input[type="checkbox"] { margin-right: 0.5rem; accent-color: var(--accent); }

/* Blockquote nested */
.prose blockquote blockquote { margin-top: 0.75rem; }

/* Code block enhancements */
.prose pre {
    background: #0d1117;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border);
    box-shadow: inset 0 1px 4px rgba(0,0,0,0.1);
    position: relative;
}

.prose pre code { background: none; padding: 0; color: #c9d1d9; font-size: 0.9rem;}

/* Code Copy Button */
.code-copy-wrapper {
    position: relative;
    margin: 1.5rem 0;
}
.code-copy-wrapper pre {
    margin: 0;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 0.5rem 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
}

.code-lang-label {
    font-size: 0.7rem;
    color: #8b949e;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.code-copy-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #c9d1d9;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}
.code-copy-btn.copied {
    background: rgba(46, 160, 67, 0.2);
    border-color: rgba(46, 160, 67, 0.4);
    color: #3fb950;
}

.prose pre.has-header {
    padding-top: 3rem;
}

.prose blockquote { border-left: 4px solid var(--accent); padding-left: 1rem; margin: 1.5rem 0; color: var(--text-muted); font-style: italic; background: var(--bg-hover); padding: 1rem 1rem 1rem 1.25rem; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }
.prose img { max-width: 100%; border-radius: var(--radius-md); border: 1px solid var(--border); box-shadow: var(--shadow-sm); margin: 1.5rem 0; }

/* Github style heading anchors */
.heading-anchor-target { position: absolute; top: -80px; visibility: hidden; }
.heading-anchor { color: inherit; text-decoration: none; }
.heading-anchor:hover { color: var(--accent); }
.heading-anchor::before {
    content: "#";
    position: absolute;
    left: -1.25rem;
    color: var(--accent);
    opacity: 0;
    transition: opacity 0.2s;
    font-weight: normal;
}
.prose h1:hover .heading-anchor::before,
.prose h2:hover .heading-anchor::before,
.prose h3:hover .heading-anchor::before {
    opacity: 1;
}

/* Grid / Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; margin-top: 1rem; }
.card { 
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); 
    padding: 1.25rem; transition: all 0.2s; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; color: var(--text-main);
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--border); }
.card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; }
.card p { font-size: 0.9rem; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin: 0; }

/* Buttons */
.btn { 
    display: inline-flex; align-items: center; justify-content: center; padding: 0.75rem 1.5rem; 
    border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem; transition: all 0.2s; cursor: pointer; border: none;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(0,122,255,0.25); }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); color: #fff; box-shadow: 0 4px 12px rgba(0,122,255,0.3); }
.btn-secondary { background: var(--bg-card); color: var(--text-main); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.btn-secondary:hover { background: var(--bg-hover); }


/* Breadcrumb */
.breadcrumb { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 1.5rem; display: flex; gap: 0.5rem; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

/* Prev/Next */
.pagination { display: flex; justify-content: space-between; margin-top: 4rem; gap: 1rem; }
.pagination-link { 
    flex: 1; border: 1px solid var(--border); border-radius: var(--radius-md); padding: 1.25rem 1.5rem;
    display: flex; flex-direction: column; transition: all 0.2s; background: transparent; position: relative; overflow: hidden;
}
.pagination-link:hover { border-color: var(--accent); background: var(--bg-hover); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.pagination-link::after { content: ''; position: absolute; top: 0; left: 0; width: 3px; height: 100%; background: var(--accent); opacity: 0; transition: opacity 0.2s; }
.pagination-link.next::after { left: auto; right: 0; }
.pagination-link:hover::after { opacity: 1; }
.pagination-link .label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; margin-bottom: 0.5rem; letter-spacing: 0.05em; display: flex; align-items: center; gap: 0.5rem; }
.pagination-link .title { font-weight: 600; color: var(--accent); font-size: 1.1rem; }
.pagination-link.next { text-align: right; }
.pagination-link.next .label { justify-content: flex-end; }

.empty-state { text-align: center; padding: 4rem 2rem; color: var(--text-muted); }
.update-time { margin-top: 3rem; font-size: 0.85rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 1rem; }

@media (max-width: 1024px) {
    .toc { display: none; }
    .main-wrapper { margin-right: 0; }
}
@media (max-width: 768px) {
    .menu-btn { display: flex; }
    .sidebar { transform: translateX(-100%); transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); width: 280px; }
    .sidebar.open { transform: translateX(0); }
    .main-wrapper { margin-left: 0; padding: 1rem; }
    .content-card { padding: 1.5rem; border-radius: 12px; }
}


/* --- 零鹊图床：独立布局（不用文档侧栏结构） --- */
.ib-page .app-container {
    display: block;
    padding-top: var(--header-h);
    min-height: 100vh;
}

.ib-shell {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    padding: 2.5rem 1.25rem 4rem;
}

.ib-shell-wide {
    max-width: 960px;
}

.ib-page .header-actions .ib-nav-link {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}
.ib-page .header-actions .ib-nav-link:hover {
    color: var(--text-main);
    background: var(--bg-hover);
    opacity: 1;
}
.ib-page .header-actions .ib-nav-link.is-active {
    color: var(--accent);
}

.ib-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 1.75rem 1.5rem;
}

.ib-lead {
    margin-bottom: 1.5rem;
}
.ib-lead h1 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.35rem;
}
.ib-lead p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.ib-dropzone {
    border: 1.5px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 2.75rem 1.25rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    background: transparent;
}
.ib-dropzone:hover,
.ib-dropzone.dragover {
    border-color: var(--accent);
    background: var(--accent-bg);
}
.ib-dropzone-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1rem;
    color: var(--text-muted);
    opacity: 0.85;
}
.ib-dropzone.dragover .ib-dropzone-icon { color: var(--accent); }
.ib-dropzone-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 0.25rem; }
.ib-dropzone-hint { color: var(--text-muted); font-size: 0.8rem; }

.ib-upload-token { margin-top: 1.25rem; }
.ib-upload-token label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}
.ib-upload-token input {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-body);
    color: var(--text-main);
    font-size: 0.9rem;
}

.ib-result {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}
.ib-result-head {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--accent);
}
.ib-field { margin-bottom: 0.85rem; }
.ib-field label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.ib-field-row {
    display: flex;
    gap: 0.5rem;
    align-items: stretch;
}
.ib-field-row input {
    flex: 1;
    min-width: 0;
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-body);
    color: var(--text-main);
    font-size: 0.8rem;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.ib-field-row .btn { flex-shrink: 0; padding: 0.5rem 0.85rem; font-size: 0.8rem; }

.ib-section {
    margin-top: 2.5rem;
}
.ib-section-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1rem;
}
.ib-gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.65rem;
}
.ib-gallery-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-card);
    aspect-ratio: 1;
}
.ib-gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.ib-empty {
    text-align: center;
    padding: 2rem 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.ib-empty .btn { margin-top: 1.25rem; }

.ib-login-shell {
    min-height: calc(100vh - var(--header-h));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
}
.ib-login-shell .ib-panel { width: 100%; max-width: 380px; }

.ib-form-group { margin-bottom: 1rem; }
.ib-form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}
.ib-form-group input {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-body);
    color: var(--text-main);
}

.ib-alert {
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.85rem;
    border: 1px solid var(--border);
}
.ib-alert-error { background: rgba(255, 59, 48, 0.1); color: #ff453a; }
.ib-alert-success { background: rgba(52, 199, 89, 0.1); color: #30d158; }

.ib-admin-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}
.ib-admin-toolbar h1 { font-size: 1.25rem; font-weight: 700; }
.ib-admin-actions-row { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.ib-admin-thumb {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid var(--border);
}
.ib-table-scroll { overflow-x: auto; margin: 0 -0.25rem; }
.ib-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    min-width: 600px;
}
.ib-table th, .ib-table td {
    padding: 0.65rem 0.5rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: middle;
}
.ib-table th { color: var(--text-muted); font-weight: 600; font-size: 0.75rem; }

.btn-danger { background: #ff3b30; color: #fff; }
.btn-danger:hover { opacity: 0.92; color: #fff; }

.ib-confirm-modal {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.ib-confirm-modal.hidden { display: none; }
.ib-confirm-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.45);
    backdrop-filter: blur(8px);
}
.ib-confirm-panel {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 400px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}
.ib-confirm-body { padding: 1.5rem; }
.ib-confirm-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.5rem; }
.ib-confirm-body p { font-size: 0.9rem; color: var(--text-muted); }
.ib-confirm-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}

.hidden { display: none !important; }
:root { --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12); }
.dark { --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.45); }

@media (max-width: 480px) {
    .ib-shell { padding-top: 1.75rem; }
    .ib-panel { padding: 1.25rem 1rem; }
    .ib-dropzone { padding: 2rem 1rem; }
}

.ib-stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.ib-stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.ib-stat-val { font-size: 1.15rem; font-weight: 700; }
.ib-stat-label { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

.ib-search-form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.ib-search-input {
    flex: 1;
    min-width: 160px;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-body);
    color: var(--text-main);
    font-size: 0.9rem;
}

.ib-batch-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.85rem;
}
.ib-check-all-label { display: flex; align-items: center; gap: 0.35rem; cursor: pointer; color: var(--text-muted); }
.ib-page-info { margin-left: auto; color: var(--text-muted); font-size: 0.8rem; }
.btn-batch-delete:disabled { opacity: 0.45; cursor: not-allowed; }

.ib-pagination {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.25rem;
    justify-content: center;
}

.ib-admin-toolbar-actions { display: flex; flex-wrap: wrap; gap: 0.35rem; }

.ib-upload-queue { margin-top: 1rem; }
.ib-queue-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}
.ib-queue-item:last-child { border-bottom: none; }
.ib-queue-status { color: var(--text-muted); font-size: 0.8rem; }
.ib-queue-status.ok { color: #34c759; }
.ib-queue-status.err { color: #ff3b30; }

.ib-paste-hint {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

.ib-docs-h2 { font-size: 1rem; font-weight: 600; margin: 1.5rem 0 0.5rem; }
.ib-docs-ul { margin: 0.5rem 0 1rem 1.25rem; font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }
.ib-docs .ib-panel code, .ib-docs code {
    font-size: 0.82rem;
    background: var(--bg-hover);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

/* 图床：桌面导航 / 汉堡菜单（对齐零鹊文档 menu-btn） */
.ib-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.ib-nav-desktop {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.ib-menu-btn {
    display: none;
}
.ib-mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 200;
    pointer-events: none;
    visibility: hidden;
}
.ib-mobile-nav.is-open {
    pointer-events: auto;
    visibility: visible;
}
.ib-mobile-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.3s ease;
}
.ib-mobile-nav.is-open .ib-mobile-backdrop {
    opacity: 1;
}
.ib-mobile-panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(300px, 88vw);
    border-left: 1px solid var(--border);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    padding: 0.75rem 0 1.5rem;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}
.ib-mobile-nav.is-open .ib-mobile-panel {
    transform: translateX(0);
}
.ib-mobile-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem 1rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 0.5rem;
}
.ib-mobile-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.ib-mobile-link {
    display: block;
    padding: 0.85rem 1.25rem;
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.2s;
}
.ib-mobile-link:hover,
.ib-mobile-link.is-active {
    background: var(--accent-bg);
    color: var(--accent);
}
.ib-mobile-theme {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}
body.ib-menu-open {
    overflow: hidden;
}

@media (max-width: 768px) {
    .ib-nav-desktop,
    .ib-theme-desktop {
        display: none !important;
    }
    .ib-menu-btn {
        display: flex !important;
    }
}