/* =========================================================================
 * MBF Wiki — macOS Light Theme (Big Sur / Sonoma)
 * Layout, structure and content are unchanged; visual design only.
 * ========================================================================= */
:root {
    /* Surfaces */
    --bg-color: #ffffff;
    /* main content surface */
    --bg-secondary: #f5f5f7;
    /* sidebar / aux panels */
    --bg-desktop-1: #ececf0;
    /* light "desktop" behind frosted panels */
    --bg-desktop-2: #f5f5f7;

    /* Frosted glass (vibrancy) */
    --panel-bg: rgba(245, 245, 247, 0.72);
    --panel-border: rgba(0, 0, 0, 0.08);
    --hairline: #d2d2d7;
    /* thin divider */

    /* Text */
    --text-primary: #1d1d1f;
    /* titles */
    --text-body: #3a3a3c;
    /* body */
    --text-muted: #86868b;
    /* secondary */

    /* Accent */
    --primary-color: #ff6a00;
    /* FPT orange, softened */
    --primary-hover: #ff6a00;
    --accent-color: #ff6a00;
    --primary-soft: rgba(255, 106, 0, 0.10);
    --primary-soft-strong: rgba(255, 106, 0, 0.16);
    --accent-blue: #007aff;
    /* macOS system blue — links / secondary */
    --accent-green: #34c759;
    /* macOS system green */

    /* Shape & depth */
    --radius-lg: 12px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --glass-blur: 20px;

    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
        "Helvetica Neue", "Inter", "Segoe UI", sans-serif;
    --font-mono: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

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

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--bg-desktop-1) 0%, var(--bg-desktop-2) 100%);
    color: var(--text-body);
    height: 100vh;
    overflow: hidden;
    display: flex;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

#app {
    display: flex;
    width: 100%;
    height: 100%;
    padding: 1.25rem;
}

.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

/* Sidebar Styling */
#sidebar {
    width: 320px;
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1rem;
    overflow: hidden;
    flex-shrink: 0;
    /* prevent squishing */
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 0 0.5rem;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.logo-container:hover {
    opacity: 0.7;
}

.sidebar-logo {
    height: 38px;
    width: auto;
}

.logo-container h1 {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin: 0;
}

.sidebar-header button {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    transition: color 0.2s, transform 0.2s;
}

.sidebar-header button:hover {
    color: var(--text-primary);
    transform: rotate(45deg);
}

.search-box {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-box i.fa-search {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.clear-search {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    font-size: 1rem;
    z-index: 5;
}

.clear-search:hover {
    color: var(--text-primary);
}

.search-box input {
    width: 100%;
    padding: 0.7rem 2.6rem 0.7rem 2.6rem;
    border-radius: 999px;
    /* pill */
    border: 1px solid transparent;
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    border-color: var(--accent-blue);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.18);
}

#nav-menu {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 0.5rem;
}

#nav-menu::-webkit-scrollbar {
    width: 6px;
}

#nav-menu::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.18);
    border-radius: 4px;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 0.6rem;
    padding-left: 0.6rem;
    font-weight: 600;
}

.nav-item {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    /* macOS Finder rounded highlight */
    color: var(--text-body);
    text-decoration: none;
    font-size: 0.92rem;
    margin-bottom: 0.15rem;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-item:hover {
    background: rgba(0, 0, 0, 0.05);
}

.nav-item.active {
    background: var(--primary-soft);
    color: var(--primary-color);
    font-weight: 600;
}

/* Main Content Styling */
#main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    min-width: 0;
}

#content-header {
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 16px;
    height: 70px;
    position: sticky;
    top: 0;
    z-index: 30;
    /* fixed height for header */
}

#breadcrumbs {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

#home-btn {
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--panel-border);
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

#home-btn:hover {
    background: rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
    transform: translateY(-1px);
}

#breadcrumbs span {
    color: var(--text-primary);
    font-weight: 600;
}

.header-divider {
    width: 1px;
    height: 24px;
    background: var(--hairline);
    margin: 0 0.5rem;
}

/* ====== Language toggle (VI/EN) ====== */
.lang-toggle {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px;
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
}

.lang-toggle button {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    padding: 0.3rem 0.6rem;
    border-radius: calc(var(--radius-md) - 3px);
    cursor: pointer;
    transition: all 0.2s;
}

.lang-toggle button:hover {
    color: var(--text-primary);
}

.lang-toggle button.active {
    background: var(--primary-color);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

/* Banner khi EN chưa có bản dịch, đang hiển thị VI */
.lang-fallback-banner {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1.25rem;
    padding: 0.6rem 0.9rem;
    background: var(--primary-soft);
    border: 1px solid rgba(255, 106, 0, 0.25);
    border-radius: var(--radius-sm);
    color: var(--text-body);
    font-size: 0.85rem;
}

.lang-fallback-banner i {
    color: var(--primary-color);
}

.lang-translate-btn {
    margin-left: auto;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.2s;
}

.lang-translate-btn:hover {
    filter: brightness(0.95);
}

.lang-translate-btn:disabled {
    opacity: 0.7;
    cursor: default;
}

.lang-translate-btn i {
    color: #ffffff;
}

#chat-toggle {
    background: rgba(0, 0, 0, 0.04);
    border: 1px solid var(--panel-border);
    color: var(--text-muted);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

#chat-toggle:hover {
    background: rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
    transform: translateY(-1px);
}

#chat-toggle.active {
    background: var(--primary-soft-strong);
    color: var(--primary-color);
    border-color: rgba(255, 106, 0, 0.35);
}

.chat-hidden #chat-sidebar,
.chat-hidden #right-resizer {
    display: none;
}

.source-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-green);
    color: #ffffff;
    text-decoration: none;
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
    border: none;
    box-shadow: var(--shadow-sm);
}

.source-btn:hover {
    filter: brightness(0.96);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

#content-body {
    flex-grow: 1;
    padding: 3rem 4rem;
    overflow-y: auto;
    overflow-x: hidden;
    font-size: 1.05rem;
    line-height: 1.6;
    background: var(--bg-color);
    color: var(--text-body);
}

#content-body::-webkit-scrollbar {
    width: 8px;
}

#content-body::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.18);
    border-radius: 4px;
}

/* Markdown specific styling inside content-body */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
    margin-top: 2em;
    margin-bottom: 0.75em;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.markdown-body h1 {
    font-size: 2.5rem;
    border-bottom: 1px solid var(--hairline);
    padding-bottom: 0.5rem;
    margin-top: 0;
    letter-spacing: -0.03em;
}

.markdown-body h2 {
    font-size: 1.75rem;
    border-bottom: 1px solid var(--hairline);
    padding-bottom: 0.4rem;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
    margin-bottom: 1.2em;
    color: var(--text-body);
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 1.5rem;
}

.markdown-body li {
    margin-bottom: 0.5rem;
}

.markdown-body a {
    color: var(--accent-blue);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.markdown-body a:hover {
    border-bottom-color: var(--accent-blue);
}

.markdown-body .wiki-link {
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    background: var(--primary-soft);
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    /* source chip — pill */
    transition: all 0.2s;
    white-space: nowrap;
    border-bottom: none;
}

.markdown-body .wiki-link:hover {
    background: var(--primary-soft-strong);
}

.markdown-body blockquote {
    border-left: 3px solid var(--hairline);
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    margin: 1.5em 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-body);
}

.markdown-body blockquote p:last-child {
    margin-bottom: 0;
}

/* Callouts Styling mapped from blockquotes */
.markdown-body blockquote.callout-note {
    border-left-color: var(--accent-blue);
    background: rgba(0, 122, 255, 0.08);
}

.markdown-body blockquote.callout-warning {
    border-left-color: #ff9f0a;
    background: rgba(255, 159, 10, 0.10);
}

.markdown-body blockquote.callout-warning strong.callout-title {
    color: #b25e00;
}

.markdown-body table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 2em 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--hairline);
    box-shadow: var(--shadow-sm);
}

.markdown-body th,
.markdown-body td {
    padding: 0.9rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--hairline);
}

.markdown-body th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-body tbody tr {
    transition: background 0.15s ease;
}

.markdown-body tbody tr:hover {
    background: rgba(0, 0, 0, 0.025);
}

.markdown-body tr:last-child td {
    border-bottom: none;
}

.markdown-body code {
    background: rgba(0, 0, 0, 0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 5px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: #c7254e;
}

.markdown-body pre {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5em 0;
    border: 1px solid var(--hairline);
}

.markdown-body pre code {
    background: transparent;
    padding: 0;
    color: var(--text-primary);
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100%;
    color: var(--text-muted);
    text-align: center;
}

.welcome-screen>i {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.welcome-screen p {
    color: var(--text-muted);
    max-width: 640px;
    line-height: 1.6;
}

.rive-container {
    width: 100%;
    margin: 1rem 0 2.5rem;
    aspect-ratio: 16 / 9;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.rive-container:fullscreen {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    aspect-ratio: auto;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rive-container:fullscreen #rive-canvas {
    max-width: 100%;
    max-height: 100%;
    aspect-ratio: 16 / 9;
}

.rive-fullscreen-btn {
    position: absolute;
    bottom: 1.25rem;
    right: 1.25rem;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity 0.25s ease, background 0.25s ease, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
    z-index: 10;
    opacity: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.rive-fullscreen-btn i {
    line-height: 1;
    display: block;
    margin: 0;
}

.rive-container:hover .rive-fullscreen-btn {
    opacity: 1;
}

.rive-fullscreen-btn:hover {
    background: #ffffff;
    color: var(--primary-color);
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.rive-container:fullscreen .rive-fullscreen-btn {
    display: none;
}

#rive-canvas {
    width: 100%;
    height: 100%;
}

.welcome-screen h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    border: none;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* Chatbot Sidebar Styling */
#chat-sidebar {
    width: 320px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
}

/* Sidebar Resizers */
.resizer {
    width: 6px;
    cursor: col-resize;
    z-index: 20;
    flex-shrink: 0;
    transition: all 0.2s;
    border-radius: 3px;
    margin: 0 0.6rem;
    /* Consistent gap between panels */
}

.resizer:hover,
.resizer.dragging {
    background: var(--primary-color);
    box-shadow: 0 0 8px rgba(255, 106, 0, 0.5);
}

#sidebar,
#main-content,
#chat-sidebar {
    margin: 0;
}

.chat-header {
    padding: 1.5rem 1rem 1rem;
    border-bottom: 1px solid var(--hairline);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.chat-mascot {
    flex-shrink: 0;
    border-bottom: 1px solid var(--hairline);
    /* Glass: nền trắng 90% + blur — tin nhắn cuộn phía sau sẽ mờ đi */
    position: relative;
    z-index: 5;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px) saturate(160%);
    -webkit-backdrop-filter: blur(10px) saturate(160%);
}

.chat-mascot canvas {
    display: block;
    width: 100%;
    height: 150px;
}

.chat-history {
    flex-grow: 1;
    overflow-y: auto;
    /* Kéo khung chat lên nằm DƯỚI vùng mascot (150px canvas + 1px border)
       để tin nhắn cuộn qua phía sau lớp glass; padding-top đẩy nội dung
       xuống đúng vị trí ban đầu. */
    margin-top: -151px;
    padding: calc(151px + 1rem) 1rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-history::-webkit-scrollbar {
    width: 6px;
}

.chat-history::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 4px;
}

.chat-bubble {
    max-width: 85%;
    padding: 0.7rem 1rem;
    border-radius: 16px;
    font-size: 0.95rem;
    line-height: 1.5;
    word-break: break-word;
}

.chat-bubble.bot {
    align-self: flex-start;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid transparent;
    color: var(--text-body);
    border-bottom-left-radius: 4px;
}

.chat-bubble.user {
    align-self: flex-end;
    background: var(--accent-blue);
    color: #fff;
    border-bottom-right-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.typing-indicator {
    display: inline-flex;
    gap: 4px;
    padding: 4px 0;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes typing {

    0%,
    80%,
    100% {
        transform: scale(0);
    }

    40% {
        transform: scale(1);
    }
}

.chat-input-container {
    padding: 1rem;
    border-top: 1px solid var(--hairline);
    display: flex;
    gap: 0.5rem;
    background: transparent;
}

#chat-input {
    flex-grow: 1;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 0.7rem 1rem;
    color: var(--text-primary);
    outline: none;
    font-size: 0.95rem;
    transition: all 0.2s;
}

#chat-input::placeholder {
    color: var(--text-muted);
}

#chat-input:focus {
    border-color: var(--accent-blue);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.18);
}

#send-btn {
    background: var(--accent-blue);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 42px;
    height: 42px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

#send-btn:hover {
    filter: brightness(0.96);
    transform: scale(1.05);
}

#send-btn:active {
    transform: scale(0.95);
}

/* ===== V2 Chatbot — Tool Use Indicator ===== */
.chat-tool-indicator {
    align-self: flex-start;
    max-width: 92%;
    margin: 2px 0 6px 0;
    padding: 4px 10px;
    font-size: 0.78rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.03);
    border-left: 2px solid var(--accent-blue);
    border-radius: 4px;
    font-style: italic;
    opacity: 0.9;
}

.chat-tool-indicator i {
    margin-right: 4px;
    color: var(--accent-blue);
}

.chat-tool-indicator code {
    background: none;
    font-size: 0.78rem;
    color: var(--text-muted);
    word-break: break-all;
}

/* ===== V2 Chatbot — Wiki links inside chat bubbles ===== */
.chat-bubble .wiki-link {
    color: var(--accent-blue);
    font-weight: 600;
    cursor: pointer;
    background: rgba(0, 122, 255, 0.10);
    padding: 0.05rem 0.4rem;
    border-radius: 999px;
    transition: all 0.15s ease;
    white-space: nowrap;
    display: inline-block;
}

.chat-bubble.user .wiki-link {
    color: #fff;
    background: rgba(255, 255, 255, 0.25);
}

.chat-bubble .wiki-link:hover {
    background: rgba(0, 122, 255, 0.2);
}

.chat-bubble .wiki-link:active {
    transform: scale(0.97);
}

/* ===== V2 Chatbot — File Download Links ===== */
.chat-bubble .download-link,
.markdown-body .download-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    margin: 2px 2px;
    color: #1c7a36;
    background: rgba(52, 199, 89, 0.14);
    border: 1px solid rgba(52, 199, 89, 0.3);
    border-radius: 8px;
    text-decoration: none !important;
    font-weight: 500;
    font-size: 0.92em;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.chat-bubble.user .download-link {
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.35);
}

.chat-bubble .download-link:hover,
.markdown-body .download-link:hover {
    background: rgba(52, 199, 89, 0.24);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.chat-bubble .download-link:active,
.markdown-body .download-link:active {
    transform: translateY(0);
}

.chat-bubble .download-link i,
.markdown-body .download-link i {
    opacity: 0.85;
    font-size: 0.88em;
}

/* ==================================================================
 * CMS — media blocks (view mode)
 * ================================================================== */
.media-block {
    margin: 1.75rem 0;
    max-width: 100%;
}

.media-align-center {
    margin-left: auto;
    margin-right: auto;
}

.media-align-left {
    float: left;
    margin: 0.5rem 1.5rem 1rem 0;
}

.media-align-right {
    float: right;
    margin: 0.5rem 0 1rem 1.5rem;
}

.media-align-full {
    width: 100% !important;
    margin-left: 0;
    margin-right: 0;
}

/* Clear floats so following headings don't collide with floated media */
.markdown-body h2 {
    clear: both;
}

.media-yt {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: #000;
}

.media-yt iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Custom-thumbnail facade — poster image + play button until clicked */
.media-yt-facade {
    cursor: pointer;
}

.media-yt-thumb {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.media-yt-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 68px;
    height: 48px;
    border: none;
    border-radius: 12px;
    background: rgba(18, 18, 18, 0.78);
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.2s;
}

.media-yt-facade:hover .media-yt-play {
    background: var(--accent-color, #ff0000);
    transform: translate(-50%, -50%) scale(1.08);
}

.media-img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    object-fit: cover;
}

.media-rive {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    background: transparent;
}

.media-rive canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.media-link-card {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.9rem 1.1rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--hairline);
    transition: all 0.2s;
}

.media-link-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.media-link-card>i {
    font-size: 1.2rem;
    color: var(--accent-color);
}

.media-link-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.media-link-title {
    font-weight: 600;
}

.media-link-url {
    font-size: 0.8rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.media-caption {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    font-style: italic;
}

.media-empty {
    padding: 1rem;
    border: 1px dashed var(--hairline);
    border-radius: 8px;
    color: var(--text-muted);
    text-align: center;
}

/* ==================================================================
 * CMS — editor overlay (edit mode)
 * ================================================================== */
.cms-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 3vh 2vw;
    overflow-y: auto;
}

.cms-modal {
    width: min(900px, 100%);
    background: var(--bg-color);
    border: 1px solid var(--hairline);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 1.5rem 1.75rem 2rem;
}

.cms-modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: sticky;
    top: 0;
}

.cms-modal-head h2 {
    font-size: 1.25rem;
    margin: 0;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.cms-modal-actions {
    display: flex;
    gap: 0.6rem;
}

.cms-save,
.cms-cancel {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    font-size: 0.9rem;
}

.cms-save {
    background: var(--accent-blue);
    color: #fff;
}

.cms-save:hover {
    filter: brightness(0.96);
    transform: translateY(-1px);
}

.cms-save:disabled {
    opacity: 0.5;
    cursor: default;
    transform: none;
}

.cms-cancel {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
    border-color: var(--panel-border);
}

.cms-cancel:hover {
    background: rgba(0, 0, 0, 0.08);
}

.cms-hint {
    color: var(--text-muted);
    font-size: 0.82rem;
    margin: 0.5rem 0 1.25rem;
}

.cms-section {
    background: var(--bg-secondary);
    border: 1px solid var(--hairline);
    border-radius: 12px;
    padding: 1rem 1.1rem;
    margin-bottom: 1.1rem;
}

.cms-section-head {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.6rem;
}

.cms-section-tag {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    white-space: nowrap;
}

.cms-heading {
    flex: 1;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    background: #fff;
    border: 1px solid var(--hairline);
    border-radius: 6px;
    padding: 0.45rem 0.6rem;
}

.cms-heading:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.cms-body {
    width: 100%;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-primary);
    background: #fff;
    border: 1px solid var(--hairline);
    border-radius: 8px;
    padding: 0.7rem 0.8rem;
}

.cms-body:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.cms-media {
    margin-top: 0.8rem;
    padding: 0.8rem;
    border: 1px solid var(--hairline);
    border-radius: 10px;
    background: #fff;
}

.cms-media-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.6rem;
}

.cms-badge {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    color: #fff;
}

.cms-badge-youtube {
    background: #c4302b;
}

.cms-badge-image {
    background: var(--accent-blue);
}

.cms-badge-rive {
    background: #7c3aed;
}

.cms-badge-link {
    background: #0891b2;
}

.cms-media-ops button,
.cms-add-bar button,
.cms-upload {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--hairline);
    border-radius: 6px;
    padding: 0.35rem 0.6rem;
    cursor: pointer;
    font-size: 0.82rem;
    margin-left: 0.3rem;
}

.cms-media-ops button:hover,
.cms-add-bar button:hover,
.cms-upload:hover {
    border-color: var(--accent-color);
}

.cms-del:hover {
    background: rgba(255, 59, 48, 0.12);
    border-color: #ff3b30;
    color: #ff3b30;
}

.cms-row {
    margin-top: 0.6rem;
}

.cms-row label,
.cms-grid3 label {
    display: block;
    font-size: 0.74rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.cms-pos-hint {
    font-weight: 400;
    opacity: 0.7;
    text-transform: none;
}

.cms-src {
    display: flex;
    gap: 0.5rem;
}

.cms-src input {
    flex: 1;
}

.cms-media input,
.cms-media select {
    width: 100%;
    background: #fff;
    color: var(--text-primary);
    border: 1px solid var(--hairline);
    border-radius: 6px;
    padding: 0.45rem 0.6rem;
    font-size: 0.85rem;
}

.cms-media input:focus,
.cms-media select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.cms-grid3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.6rem;
    margin-top: 0.6rem;
}

.cms-grid2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
    margin-top: 0.6rem;
}

.cms-grid2 label {
    display: block;
    font-size: 0.74rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.cms-add-bar {
    margin-top: 0.85rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.3rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==================================================================
 * HOME SLIDESHOW (inline carousel)
 * ================================================================== */
.slideshow {
    width: 100%;
    margin: 2.5rem 0 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    text-align: left;
}

/* Present (expand) button — floating at bottom-right of the slide */
.slide-present-fab {
    position: absolute;
    bottom: 1.25rem;
    right: 1.25rem;
    z-index: 6;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 122, 255, 0.85);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background 0.25s ease, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
}

.slide-present-fab i {
    line-height: 1;
    display: block;
    margin: 0;
    font-size: 1rem;
}

.slide-present-fab:hover {
    background: var(--accent-blue);
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.4);
}

.slideshow-stage {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    overflow: hidden;
}

.slide-track {
    position: absolute;
    inset: 0;
}

.slide-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    pointer-events: none;
    will-change: opacity, transform;
}

.slide-img.active {
    opacity: 1;
    pointer-events: auto;
}

.slide-nav {
    position: absolute;
    top: 50%;
    z-index: 5;
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    opacity: 0;
    transform: translateY(-50%);
    transition: opacity 0.25s ease, background 0.25s ease, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
}

.slide-nav i {
    line-height: 1;
    display: block;
    margin: 0;
}

.slideshow-stage:hover .slide-nav {
    opacity: 1;
}

.slide-nav.prev {
    left: 1.25rem;
}

.slide-nav.next {
    right: 1.25rem;
}

.slide-nav:hover {
    background: #fff;
    color: var(--primary-color);
}

.slide-nav.prev:hover {
    transform: translateY(-50%) scale(1.1) translateX(-2px);
}

.slide-nav.next:hover {
    transform: translateY(-50%) scale(1.1) translateX(2px);
}

.slide-dots {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    padding: 0.8rem 1rem;
}

.slide-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    border: none;
    padding: 0;
    background: var(--hairline);
    cursor: pointer;
    transition: all 0.2s ease;
}

.slide-dot.active {
    background: var(--primary-color);
    transform: scale(1.35);
}

/* ==================================================================
 * FULLSCREEN PRESENTATION (PowerPoint-style overlay)
 * ================================================================== */
.present-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: #0b0b0c;
    display: flex;
    align-items: center;
    justify-content: center;
}

.present-stage {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.present-img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: contain;
    will-change: opacity, transform;
}

.present-topbar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.4rem;
    color: rgba(255, 255, 255, 0.85);
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.45), transparent);
}

.present-counter {
    font-size: 0.9rem;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
}

.present-actions {
    display: flex;
    gap: 0.5rem;
}

.present-actions button {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.15s ease;
}

.present-actions button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.present-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.25s ease, background 0.15s ease;
}

.present-nav i {
    line-height: 1;
    display: block;
}

.present-overlay:hover .present-nav {
    opacity: 1;
}

.present-nav:hover {
    background: rgba(255, 255, 255, 0.22);
    transform: translateY(-50%) scale(1.06);
}

.present-nav.prev {
    left: 1.5rem;
}

.present-nav.next {
    right: 1.5rem;
}

.present-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(255, 255, 255, 0.12);
    z-index: 10;
}

.present-progress-bar {
    height: 100%;
    width: 0;
    background: var(--primary-color);
    transition: width 0.4s ease;
}

.present-hint {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.55);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.present-overlay:hover .present-hint {
    opacity: 1;
}

/* ---- CMS: manual text-link tools + picker ---- */
.cms-text-tools {
    margin-top: 0.5rem;
}

.cms-text-tools button {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(0, 122, 255, 0.10);
    color: var(--accent-blue);
    border: 1px solid rgba(0, 122, 255, 0.25);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all 0.15s ease;
}

.cms-text-tools button:hover {
    background: rgba(0, 122, 255, 0.16);
    transform: translateY(-1px);
}

.cms-link-pop {
    position: fixed;
    inset: 0;
    z-index: 1100;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2vh 2vw;
}

.cms-link-card {
    width: min(440px, 100%);
    background: var(--bg-color);
    border: 1px solid var(--hairline);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 1.25rem 1.4rem 1.4rem;
}

.cms-link-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.cms-link-head h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
}

.cms-link-head h3 i {
    color: var(--accent-blue);
}

.cms-link-x {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.05rem;
    transition: color 0.15s;
}

.cms-link-x:hover {
    color: var(--text-primary);
}

.cms-link-warn {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(255, 159, 10, 0.10);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.7rem;
    margin-bottom: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.cms-link-warn i {
    color: #b25e00;
}

.cms-link-lbl {
    display: block;
    font-size: 0.74rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin: 0.9rem 0 0.35rem;
}

.cms-link-lbl:first-of-type {
    margin-top: 0;
}

.cms-link-types {
    display: flex;
    gap: 1.25rem;
    font-size: 0.9rem;
    color: var(--text-body);
}

.cms-link-types label {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
}

.cms-link-types input {
    accent-color: var(--accent-blue);
}

.cms-link-card input[type="text"],
.cms-link-card input[type="url"] {
    width: 100%;
    background: #fff;
    color: var(--text-primary);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-sm);
    padding: 0.55rem 0.7rem;
    font-size: 0.92rem;
    font-family: var(--font-sans);
}

.cms-link-card input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

.cms-link-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.6rem;
    margin-top: 1.3rem;
}

/* ==================================================================
 * MOBILE LAYOUT (≤ 768px)
 * - Wiki sidebar → hamburger drawer (slide-in from left)
 * - Chatbot → bottom-sheet popup
 * - Body content fills the screen
 * ================================================================== */
.sidebar-header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.chat-header-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

/* Mobile-only controls — hidden on desktop */
#menu-toggle,
#sidebar-close,
#chat-close,
#mobile-backdrop {
    display: none;
}

@media (max-width: 768px) {
    body {
        height: 100dvh;
        /* handle mobile browser chrome */
    }

    #app {
        padding: 0.6rem;
    }

    /* No column resizing on touch screens */
    .resizer {
        display: none;
    }

    /* ---------- Header ---------- */
    #content-header {
        padding: 0.6rem 0.75rem;
        height: 56px;
        border-radius: 12px;
    }

    .header-divider {
        display: none;
    }

    #menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 38px;
        height: 38px;
        flex-shrink: 0;
        background: rgba(0, 0, 0, 0.04);
        border: 1px solid var(--panel-border);
        border-radius: var(--radius-md);
        color: var(--text-primary);
        font-size: 1rem;
        cursor: pointer;
    }

    #breadcrumbs {
        gap: 0.5rem;
        min-width: 0;
    }

    #breadcrumbs span {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        max-width: 30vw;
    }

    /* ---------- Wiki sidebar → hamburger drawer ---------- */
    #sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        height: 100dvh;
        width: min(84vw, 320px) !important;
        /* beat inline width from desktop resizer */
        border-radius: 0 16px 16px 0;
        z-index: 220;
        transform: translateX(-105%);
        transition: transform 0.32s cubic-bezier(0.32, 0.72, 0, 1);
        background: rgba(245, 245, 247, 0.96);
    }

    #app.sidebar-open #sidebar {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }

    #sidebar-close {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        font-size: 1.25rem !important;
    }

    #sidebar-close:hover {
        transform: none !important;
        /* cancel the rotate hover meant for the refresh icon */
    }

    /* ---------- Backdrop (shared by drawer & chat popup) ---------- */
    #mobile-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 210;
        background: rgba(0, 0, 0, 0.35);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    #app.sidebar-open #mobile-backdrop,
    #app.mobile-chat-open #mobile-backdrop {
        opacity: 1;
        pointer-events: auto;
    }

    /* ---------- Main content = the page ---------- */
    #main-content {
        gap: 0.6rem;
    }

    #content-body {
        padding: 1.5rem 1.1rem;
        font-size: 1rem;
        border-radius: 12px;
    }

    .markdown-body h1 {
        font-size: 1.7rem;
    }

    .markdown-body h2 {
        font-size: 1.35rem;
    }

    /* Wide tables scroll inside themselves instead of breaking layout */
    .markdown-body table {
        display: block;
        overflow-x: auto;
    }

    .welcome-screen h1 {
        font-size: 1.5rem;
    }

    /* ---------- Chatbot → popup (bottom sheet) ---------- */
    #chat-sidebar,
    .chat-hidden #chat-sidebar {
        display: flex !important;
        /* visibility is driven by transform, not display */
        position: fixed;
        left: 0.6rem;
        right: 0.6rem;
        bottom: 0.6rem;
        top: auto;
        width: auto !important;
        /* beat inline width from desktop resizer */
        height: min(72dvh, 560px);
        z-index: 230;
        transform: translateY(calc(100% + 1.5rem));
        transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
        background: rgba(245, 245, 247, 0.97);
        box-shadow: var(--shadow-lg);
    }

    #app.mobile-chat-open #chat-sidebar {
        transform: translateY(0);
    }

    #chat-close {
        display: flex;
        align-items: center;
        justify-content: center;
        background: none;
        border: none;
        color: var(--text-muted);
        font-size: 1.25rem;
        cursor: pointer;
        transition: color 0.2s;
    }

    #chat-close:hover {
        color: var(--text-primary);
    }

    .chat-header {
        padding: 1rem 1rem 0.8rem;
    }
}