/* ============================================================
    MarkdStudio — Styles
    ============================================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; -webkit-text-size-adjust: 100%; }
body {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--ui-text);
    background: var(--ui-bg);
    overflow: hidden;
}
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* Keyboard focus ring for interactive controls */
button:focus-visible,
a:focus-visible,
select:focus-visible,
textarea:focus-visible,
input:focus-visible,
.toc-item:focus-visible,
.tab:focus-visible {
    outline: 2px solid var(--ui-accent);
    outline-offset: 2px;
}

/* ---------- CSS Variables (Themes) ---------- */
:root,
[data-theme="github"] {
    --preview-bg: #ffffff;
    --preview-text: #1f2328;
    --preview-text-secondary: #656d76;
    --preview-heading: #1f2328;
    --preview-link: #0969da;
    --preview-border: #d0d7de;
    --preview-code-bg: #f6f8fa;
    --preview-code-text: #1f2328;
    --preview-blockquote-border: #d0d7de;
    --preview-blockquote-text: #656d76;
    --preview-table-border: #d0d7de;
    --preview-table-stripe: #f6f8fa;
    --preview-hr: #d8dee4;
    --preview-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --preview-font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --preview-font-code: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --preview-font-size: 16px;
    --preview-line-height: 1.6;
    --preview-max-width: 900px;
    --preview-paragraph-spacing: 1em;
}
[data-theme="documentation"] {
    --preview-bg: #f4f8ff;
    --preview-text: #1b2a41;
    --preview-text-secondary: #4a5f7a;
    --preview-heading: #10213a;
    --preview-link: #005ecb;
    --preview-border: #c7d6ea;
    --preview-code-bg: #eaf1fb;
    --preview-code-text: #173255;
    --preview-blockquote-border: #4f80c9;
    --preview-blockquote-text: #3f5370;
    --preview-table-border: #c7d6ea;
    --preview-table-stripe: #edf4ff;
    --preview-hr: #c9d8ec;
    --preview-font-body: 'Inter', -apple-system, sans-serif;
    --preview-font-heading: 'JetBrains Mono', 'Fira Code', monospace;
    --preview-font-code: 'JetBrains Mono', monospace;
    --preview-font-size: 15px;
    --preview-line-height: 1.55;
    --preview-max-width: 1020px;
    --preview-paragraph-spacing: 0.95em;
}
[data-theme="blog"] {
    --preview-bg: #fff8ef;
    --preview-text: #3f2f20;
    --preview-text-secondary: #7a6653;
    --preview-heading: #2a1f16;
    --preview-link: #b25a1f;
    --preview-border: #eadfce;
    --preview-code-bg: #f7efe3;
    --preview-code-text: #4c3826;
    --preview-blockquote-border: #d38f57;
    --preview-blockquote-text: #6f5a48;
    --preview-table-border: #eadfce;
    --preview-table-stripe: #fff3e5;
    --preview-hr: #e6d7c2;
    --preview-font-body: 'Merriweather', Georgia, serif;
    --preview-font-heading: 'Lora', Georgia, serif;
    --preview-font-code: 'JetBrains Mono', monospace;
    --preview-font-size: 17px;
    --preview-line-height: 1.85;
    --preview-max-width: 760px;
    --preview-paragraph-spacing: 1.35em;
}
[data-theme="minimal"] {
    --preview-bg: #ffffff;
    --preview-text: #0f0f0f;
    --preview-text-secondary: #737373;
    --preview-heading: #000000;
    --preview-link: #000000;
    --preview-border: #e8e8e8;
    --preview-code-bg: #f2f2f2;
    --preview-code-text: #141414;
    --preview-blockquote-border: #d6d6d6;
    --preview-blockquote-text: #595959;
    --preview-table-border: #e8e8e8;
    --preview-table-stripe: #fcfcfc;
    --preview-hr: #e5e5e5;
    --preview-font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --preview-font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --preview-font-code: 'SF Mono', 'Cascadia Code', monospace;
    --preview-font-size: 14px;
    --preview-line-height: 1.5;
    --preview-max-width: 680px;
    --preview-paragraph-spacing: 0.75em;
}
[data-theme="academic"] {
    --preview-bg: #fbf8ef;
    --preview-text: #2a2520;
    --preview-text-secondary: #6a6053;
    --preview-heading: #211b16;
    --preview-link: #1e3a74;
    --preview-border: #cfc5ad;
    --preview-code-bg: #f2ecdd;
    --preview-code-text: #2f281f;
    --preview-blockquote-border: #9b8b70;
    --preview-blockquote-text: #5e5448;
    --preview-table-border: #cfc5ad;
    --preview-table-stripe: #f7f2e6;
    --preview-hr: #c8bba1;
    --preview-font-body: Georgia, 'Times New Roman', serif;
    --preview-font-heading: 'Lora', 'Georgia', 'Times New Roman', serif;
    --preview-font-code: 'JetBrains Mono', monospace;
    --preview-font-size: 18px;
    --preview-line-height: 1.92;
    --preview-max-width: 760px;
    --preview-paragraph-spacing: 1.35em;
}

/* ---------- UI Chrome Variables ---------- */
:root {
    --ui-bg: #ffffff;
    --ui-bg-secondary: #f6f8fa;
    --ui-bg-tertiary: #eaeef2;
    --ui-text: #1f2328;
    --ui-text-secondary: #656d76;
    --ui-border: #d0d7de;
    --ui-hover: #f3f4f6;
    --ui-accent: #0969da;
    --ui-accent-bg: #ddf4ff;
    --ui-scrollbar: #d0d7de;
    --ui-scrollbar-hover: #afb8c1;
    --ui-shadow: rgba(0,0,0,0.08);
    --ui-shadow-heavy: rgba(0,0,0,0.12);
    --ui-overlay: rgba(0,0,0,0.4);
    --ui-editor-bg: #ffffff;
    --ui-editor-text: #1f2328;
}

/* ---------- Dark Mode — UI Chrome ---------- */
[data-appearance="dark"] {
    --ui-bg: #0d1117;
    --ui-bg-secondary: #161b22;
    --ui-bg-tertiary: #21262d;
    --ui-text: #e6edf3;
    --ui-text-secondary: #8b949e;
    --ui-border: #30363d;
    --ui-hover: #21262d;
    --ui-accent: #58a6ff;
    --ui-accent-bg: #1c3351;
    --ui-scrollbar: #30363d;
    --ui-scrollbar-hover: #484f58;
    --ui-shadow: rgba(0,0,0,0.3);
    --ui-shadow-heavy: rgba(0,0,0,0.4);
    --ui-overlay: rgba(0,0,0,0.6);
    --ui-editor-bg: #0d1117;
    --ui-editor-text: #e6edf3;
}

/* ---------- Dark Mode — Document Theme Overrides ---------- */
[data-appearance="dark"][data-theme="github"] {
    --preview-bg: #0d1117;
    --preview-text: #e6edf3;
    --preview-text-secondary: #8b949e;
    --preview-heading: #e6edf3;
    --preview-link: #58a6ff;
    --preview-border: #30363d;
    --preview-code-bg: #161b22;
    --preview-code-text: #e6edf3;
    --preview-blockquote-border: #30363d;
    --preview-blockquote-text: #8b949e;
    --preview-table-border: #30363d;
    --preview-table-stripe: #161b22;
    --preview-hr: #21262d;
}
[data-appearance="dark"][data-theme="documentation"] {
    --preview-bg: #0b1a2b;
    --preview-text: #d7e5f8;
    --preview-text-secondary: #95abc6;
    --preview-heading: #eef5ff;
    --preview-link: #8dc2ff;
    --preview-border: #27415f;
    --preview-code-bg: #11263c;
    --preview-code-text: #d7e5f8;
    --preview-blockquote-border: #5797df;
    --preview-blockquote-text: #9eb3ce;
    --preview-table-border: #27415f;
    --preview-table-stripe: #102337;
    --preview-hr: #2a4666;
}
[data-appearance="dark"][data-theme="blog"] {
    --preview-bg: #1b140f;
    --preview-text: #e3d5c4;
    --preview-text-secondary: #af9a84;
    --preview-heading: #f1e3d1;
    --preview-link: #ffb572;
    --preview-border: #443226;
    --preview-code-bg: #281d16;
    --preview-code-text: #e6d8c6;
    --preview-blockquote-border: #c28249;
    --preview-blockquote-text: #b39f89;
    --preview-table-border: #443226;
    --preview-table-stripe: #241a13;
    --preview-hr: #4b382a;
}
[data-appearance="dark"][data-theme="minimal"] {
    --preview-bg: #080808;
    --preview-text: #f3f3f3;
    --preview-text-secondary: #9c9c9c;
    --preview-heading: #ffffff;
    --preview-link: #f3f3f3;
    --preview-border: #242424;
    --preview-code-bg: #121212;
    --preview-code-text: #f3f3f3;
    --preview-blockquote-border: #3a3a3a;
    --preview-blockquote-text: #b0b0b0;
    --preview-table-border: #242424;
    --preview-table-stripe: #101010;
    --preview-hr: #242424;
}
[data-appearance="dark"][data-theme="academic"] {
    --preview-bg: #16120d;
    --preview-text: #ddd1bf;
    --preview-text-secondary: #a99a84;
    --preview-heading: #efe2cf;
    --preview-link: #8ab4ff;
    --preview-border: #3a3025;
    --preview-code-bg: #221a12;
    --preview-code-text: #ddd1bf;
    --preview-blockquote-border: #7b6a55;
    --preview-blockquote-text: #b3a38e;
    --preview-table-border: #3a3025;
    --preview-table-stripe: #20180f;
    --preview-hr: #3a3025;
}

/* Dark callouts */
[data-appearance="dark"] .callout-note { background: #12283a; border-color: #58a6ff; }
[data-appearance="dark"] .callout-note .callout-title { color: #58a6ff; }
[data-appearance="dark"] .callout-tip { background: #0f2d1a; border-color: #3fb950; }
[data-appearance="dark"] .callout-tip .callout-title { color: #3fb950; }
[data-appearance="dark"] .callout-warning { background: #2a2011; border-color: #d29922; }
[data-appearance="dark"] .callout-warning .callout-title { color: #d29922; }
[data-appearance="dark"] .callout-important { background: #2d1115; border-color: #f85149; }
[data-appearance="dark"] .callout-important .callout-title { color: #f85149; }
[data-appearance="dark"] .callout-caution { background: #2a1a0e; border-color: #db6d28; }
[data-appearance="dark"] .callout-caution .callout-title { color: #db6d28; }

/* Dark mode mark/kbd/mermaid-error */
[data-appearance="dark"] .markdown-body mark { background: #3d3117; color: #e6edf3; }
[data-appearance="dark"] .mermaid-error { background: #2d1115; color: #f85149; }
[data-appearance="dark"] .markdown-body .code-header { background: rgba(255,255,255,0.04); }
[data-appearance="dark"] .markdown-body .copy-btn:hover { background: #30363d; color: #e6edf3; }
[data-appearance="dark"] .markdown-body .copy-btn.copied { background: #0f2d1a; color: #3fb950; border-color: #238636; }

/* ---------- App Layout ---------- */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ---------- Header ---------- */
#app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    padding: 0 12px;
    background: color-mix(in srgb, var(--ui-bg) 86%, transparent);
    border-bottom: 1px solid var(--ui-border);
    flex-shrink: 0;
    z-index: 100;
    gap: 8px;
    backdrop-filter: blur(10px);
}
.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}
.header-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
}
.header-right {
    display: flex;
    align-items: center;
    gap: 4px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 15px;
    color: var(--ui-text);
    white-space: nowrap;
}
.logo svg { color: var(--ui-accent); flex-shrink: 0; }

/* ---------- Icon & Toolbar Buttons ---------- */
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--ui-text-secondary);
    transition: background 0.15s, color 0.15s, transform 0.15s;
}
.icon-btn:hover { background: var(--ui-hover); color: var(--ui-text); transform: translateY(-1px); }
.icon-btn.active { color: var(--ui-accent); background: var(--ui-accent-bg); }
.icon-btn.sm { width: 26px; height: 26px; }

.toolbar-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 32px;
    padding: 0 10px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: transparent;
    color: var(--ui-text-secondary);
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s;
    white-space: nowrap;
}
.toolbar-btn:hover { background: var(--ui-hover); color: var(--ui-text); border-color: var(--ui-border); transform: translateY(-1px); }
.toolbar-btn svg { flex-shrink: 0; }

/* ---------- Mode Switcher ---------- */
.mode-switcher {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--ui-bg-secondary);
    padding: 3px;
    border-radius: 8px;
    border: 1px solid var(--ui-border);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.mode-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 30px;
    padding: 0 12px;
    border: none;
    border-radius: 7px;
    background: transparent;
    color: var(--ui-text-secondary);
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s;
    white-space: nowrap;
}
.mode-btn:hover { color: var(--ui-text); background: color-mix(in srgb, var(--ui-hover) 70%, transparent); }
.mode-btn.active {
    background: color-mix(in srgb, var(--ui-accent-bg) 55%, var(--ui-bg));
    color: var(--ui-text);
    box-shadow: 0 1px 3px var(--ui-shadow), inset 0 0 0 1px color-mix(in srgb, var(--ui-accent) 40%, transparent);
}
.mode-btn svg { flex-shrink: 0; }

/* ---------- Dropdown ---------- */
.dropdown { position: relative; }
.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 180px;
    background: var(--ui-bg);
    border: 1px solid var(--ui-border);
    border-radius: 8px;
    box-shadow: 0 4px 16px var(--ui-shadow-heavy);
    padding: 4px;
    z-index: 200;
    transform: translateY(-4px) scale(0.98);
    transform-origin: top right;
    opacity: 0;
    animation: dropdown-in 0.14s ease forwards;
}
.dropdown.open .dropdown-menu { display: block; }

@keyframes dropdown-in {
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}
.dropdown-item {
    display: block;
    width: 100%;
    padding: 8px 12px;
    border: none;
    border-radius: 5px;
    background: transparent;
    color: var(--ui-text);
    font-size: 13px;
    text-align: left;
    transition: background 0.1s;
    cursor: pointer;
}
.dropdown-item:hover { background: var(--ui-hover); }
.dropdown-item.active { background: var(--ui-accent-bg); color: var(--ui-accent); font-weight: 500; }
.dropdown-divider { height: 1px; margin: 4px 8px; background: var(--ui-border); border: none; }

/* Dropdown Panel (Typography) */
.dropdown-panel {
    min-width: 260px;
    padding: 12px;
}
.panel-group { margin-bottom: 12px; }
.panel-group:last-child { margin-bottom: 0; }
.panel-group label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--ui-text-secondary);
    margin-bottom: 6px;
}
.panel-group select,
.panel-group input[type="range"] {
    width: 100%;
}
.panel-group select {
    height: 32px;
    padding: 0 8px;
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    font-size: 13px;
    background: var(--ui-bg);
    color: var(--ui-text);
}
.panel-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--ui-border);
    outline: none;
    margin-top: 4px;
}
.panel-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--ui-accent);
    cursor: pointer;
}
.panel-btn {
    width: 100%;
    padding: 6px 12px;
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    background: var(--ui-bg-secondary);
    color: var(--ui-text);
    font-size: 13px;
    font-weight: 500;
    transition: background 0.15s;
}
.panel-btn:hover { background: var(--ui-bg-tertiary); }

/* ---------- Tab Bar ---------- */
#tab-bar {
    display: flex;
    align-items: center;
    height: 36px;
    background: linear-gradient(to bottom, color-mix(in srgb, var(--ui-bg-secondary) 90%, var(--ui-bg)) 0%, var(--ui-bg-secondary) 100%);
    border-bottom: 1px solid var(--ui-border);
    padding: 0 4px;
    flex-shrink: 0;
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}
#tab-bar::-webkit-scrollbar { display: none; }
#tabs-group {
    display: flex;
    align-items: center;
    min-width: 0;
    flex: 1;
}
#tabs-container {
    display: flex;
    align-items: center;
    gap: 1px;
    flex: 0 1 auto;
    min-width: 0;
}
#tab-bar-right {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    padding-left: 8px;
    border-left: 1px solid var(--ui-border);
}
#doc-stats {
    color: var(--ui-text-secondary);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    padding: 0 4px;
}
#toc-toggle-btn {
    width: 26px;
    height: 26px;
}
.tab {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 30px;
    padding: 0 12px;
    border: none;
    border-radius: 8px 8px 0 0;
    background: transparent;
    color: var(--ui-text-secondary);
    font-size: 12px;
    cursor: pointer;
    white-space: nowrap;
    max-width: 200px;
    overflow: hidden;
    position: relative;
    transition: background 0.12s, color 0.12s, transform 0.12s;
}
.tab:hover { background: var(--ui-bg-tertiary); color: var(--ui-text); transform: translateY(-1px); }
.tab.active {
    background: var(--ui-bg);
    color: var(--ui-text);
    font-weight: 500;
    border-bottom: 2px solid var(--ui-accent);
    box-shadow: 0 -1px 0 color-mix(in srgb, var(--ui-accent) 18%, transparent), 0 1px 2px var(--ui-shadow);
}
.tab-title {
    overflow: hidden;
    text-overflow: ellipsis;
}
.tab-modified {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: #bf8700;
    flex-shrink: 0;
}
.tab-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px; height: 18px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--ui-text-secondary);
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.1s, background 0.1s;
}
.tab:hover .tab-close, .tab.active .tab-close { opacity: 1; }
.tab-close:hover { background: var(--ui-border); color: var(--ui-text); }

#new-tab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--ui-text-secondary);
    flex-shrink: 0;
    margin-left: 2px;
    transition: background 0.15s, color 0.15s, transform 0.15s;
}
#new-tab-btn:hover { background: var(--ui-bg-tertiary); color: var(--ui-text); transform: translateY(-1px); }

/* ---------- Main Content ---------- */
#main-content {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

/* ---------- TOC Sidebar ---------- */
#toc-sidebar {
    width: 240px;
    min-width: 200px;
    background: var(--ui-bg-secondary);
    border-left: 1px solid var(--ui-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow: hidden;
    transition: width 0.2s, min-width 0.2s, opacity 0.2s;
}
#toc-sidebar.hidden {
    width: 0;
    min-width: 0;
    border-left: none;
    opacity: 0;
    pointer-events: none;
}
#toc-sidebar.mobile-open {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
}
.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ui-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--ui-border);
    flex-shrink: 0;
}
#toc-nav {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}
.toc-item {
    display: block;
    width: 100%;
    padding: 5px 12px;
    border: none;
    border-left: 2px solid transparent;
    background: transparent;
    color: var(--ui-text-secondary);
    font-size: 13px;
    text-align: left;
    cursor: pointer;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    transition: color 0.1s, border-color 0.1s, background 0.1s;
}
.toc-item:hover { color: var(--ui-text); background: var(--ui-bg-tertiary); }
.toc-item.active { color: var(--ui-accent); border-left-color: var(--ui-accent); font-weight: 500; }
.toc-item[data-level="1"] { padding-left: 12px; font-weight: 600; }
.toc-item[data-level="2"] { padding-left: 24px; }
.toc-item[data-level="3"] { padding-left: 36px; }
.toc-item[data-level="4"] { padding-left: 48px; font-size: 12px; }
.toc-item[data-level="5"] { padding-left: 56px; font-size: 12px; }
.toc-item[data-level="6"] { padding-left: 64px; font-size: 12px; }

/* ---------- Editor Panel ---------- */
#editor-panel {
    flex: 1;
    display: flex;
    min-width: 0;
    overflow: hidden;
    background: color-mix(in srgb, var(--ui-editor-bg) 95%, var(--ui-bg));
}

/* Editor Gutter (Line Numbers) */
#editor-gutter {
    display: flex;
    flex-direction: column;
    width: 48px;
    min-width: 48px;
    background: color-mix(in srgb, var(--ui-editor-bg) 50%, var(--ui-bg-secondary));
    border-right: 1px solid var(--ui-border);
    padding: 24px 0;
    overflow: hidden;
    user-select: none;
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.7;
    color: var(--ui-text-secondary);
}
.gutter-line {
    padding: 0 8px;
    height: 1.7em;
}
#editor-gutter::-webkit-scrollbar {
    display: none;
}
#editor {
    flex: 1;
    height: 100%;
    resize: none;
    border: none;
    outline: none;
    padding: 24px 28px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 14px;
    line-height: 1.7;
    color: var(--ui-editor-text);
    background: var(--ui-editor-bg);
    tab-size: 4;
    -moz-tab-size: 4;
    overflow-y: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
}
#editor::placeholder { color: #adb5bd; }
#editor:focus-visible { outline: 2px solid var(--ui-accent); outline-offset: -2px; }

/* CodeMirror editor integration */
#editor-panel .CodeMirror {
    flex: 1;
    height: 100%;
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 14px;
    line-height: 1.7;
    background: var(--ui-editor-bg);
    color: var(--ui-editor-text);
}
#editor-panel .CodeMirror-gutters {
    background: color-mix(in srgb, var(--ui-editor-bg) 55%, var(--ui-bg-secondary));
    border-right: 1px solid var(--ui-border);
}
#editor-panel .CodeMirror-linenumber {
    color: var(--ui-text-secondary);
}
#editor-panel .CodeMirror-cursor {
    border-left: 2px solid var(--ui-accent);
}
#editor-panel .CodeMirror-selected {
    background: color-mix(in srgb, var(--ui-accent) 20%, transparent);
}
#editor-panel .CodeMirror-focused .CodeMirror-selected {
    background: color-mix(in srgb, var(--ui-accent) 30%, transparent);
}

/* Markdown syntax colors */
#editor-panel .cm-header { color: #1f6feb; font-weight: 700; }
#editor-panel .cm-formatting-header { color: #6ea8fe; }
#editor-panel .cm-formatting-list,
#editor-panel .cm-variable-2 { color: #bf8700; }
#editor-panel .cm-link,
#editor-panel .cm-url { color: #0a7ea4; text-decoration: underline; }
#editor-panel .cm-quote { color: #6e7781; font-style: italic; }
#editor-panel .cm-comment { color: #8b949e; }
#editor-panel .cm-em { color: #b06f00; }
#editor-panel .cm-strong { color: #cf222e; font-weight: 700; }
#editor-panel .cm-strikethrough { text-decoration: line-through; }
#editor-panel .cm-inline-code,
#editor-panel .cm-comment.cm-code,
#editor-panel .cm-string.cm-url {
    color: #0550ae;
    background: color-mix(in srgb, var(--ui-bg-tertiary) 80%, transparent);
}
#editor-panel .cm-matchingbracket {
    color: var(--ui-text) !important;
    background: color-mix(in srgb, var(--ui-accent) 28%, transparent);
    border-radius: 3px;
}

/* Search and replace highlights */
#editor-panel .CodeMirror-dialog {
    background: var(--ui-bg-secondary);
    border: 1px solid var(--ui-border);
    color: var(--ui-text);
}
#editor-panel .CodeMirror-searching {
    background: color-mix(in srgb, #fff3bf 80%, transparent);
    outline: 1px solid color-mix(in srgb, #ffec99 65%, transparent);
}

[data-appearance="dark"] #editor-panel .CodeMirror {
    background: #1e1f22;
    color: #e6edf3;
}
[data-appearance="dark"] #editor-panel .CodeMirror-gutters {
    background: #171b22;
    border-right-color: #30363d;
}
[data-appearance="dark"] #editor-panel .cm-header { color: #79c0ff; }
[data-appearance="dark"] #editor-panel .cm-formatting-header { color: #7aa2f7; }
[data-appearance="dark"] #editor-panel .cm-link,
[data-appearance="dark"] #editor-panel .cm-url { color: #58a6ff; }
[data-appearance="dark"] #editor-panel .cm-inline-code,
[data-appearance="dark"] #editor-panel .cm-comment.cm-code,
[data-appearance="dark"] #editor-panel .cm-string.cm-url {
    color: #a5d6ff;
    background: rgba(88, 166, 255, 0.12);
}
[data-appearance="dark"] #editor-panel .CodeMirror-searching {
    background: rgba(255, 196, 0, 0.25);
    outline-color: rgba(255, 196, 0, 0.45);
}

/* ---------- Panel Divider ---------- */
#panel-divider {
    width: 4px;
    cursor: col-resize;
    background: var(--ui-border);
    flex-shrink: 0;
    position: relative;
    transition: background 0.15s;
}
#panel-divider:hover,
#panel-divider.dragging { background: var(--ui-accent); }

/* ---------- Preview Panel ---------- */
#preview-panel {
    flex: 1;
    overflow-y: auto;
    background:
        radial-gradient(circle at 10% 5%, color-mix(in srgb, var(--preview-border) 14%, transparent), transparent 42%),
        var(--preview-bg);
    min-width: 0;
}
#preview-content {
    max-width: var(--preview-max-width);
    margin: 0 auto;
    padding: 32px 40px;
}

.empty-preview {
    max-width: 560px;
    margin: 32px auto;
    padding: 20px;
    border: 1px dashed var(--preview-border);
    border-radius: 12px;
    color: var(--preview-text-secondary);
    background: color-mix(in srgb, var(--preview-code-bg) 35%, transparent);
}
.empty-preview h3 {
    margin-bottom: 8px;
    color: var(--preview-heading);
    font-size: 18px;
}
.empty-preview p {
    margin-bottom: 10px;
}
.empty-preview ul {
    padding-left: 1.2em;
}
.empty-preview li {
    margin-bottom: 6px;
}

/* ---------- Inline Editor ---------- */
#inline-editor {
    display: none;
    flex: 1;
    overflow-y: auto;
    background: var(--preview-bg);
    padding: 32px 40px;
    max-width: var(--preview-max-width);
    margin: 0 auto;
    width: 100%;
}

/* ---------- Mode Layouts ---------- */
[data-mode="split"] #editor-panel,
[data-mode="split"] #panel-divider,
[data-mode="split"] #preview-panel { display: flex; }
[data-mode="split"] #inline-editor { display: none; }

[data-mode="write"] #editor-panel { display: flex; flex: 1; }
[data-mode="write"] #panel-divider,
[data-mode="write"] #preview-panel,
[data-mode="write"] #inline-editor { display: none; }

[data-mode="preview"] #preview-panel { display: flex; flex: 1; }
[data-mode="preview"] #editor-panel,
[data-mode="preview"] #panel-divider,
[data-mode="preview"] #inline-editor { display: none; }

[data-mode="inline"] #inline-editor { display: block; flex: 1; padding-top: 0; order: 1; }
[data-mode="inline"] #toc-sidebar { order: 2; }
[data-mode="inline"] #editor-panel,
[data-mode="inline"] #panel-divider,
[data-mode="inline"] #preview-panel { display: none; }

/* ---------- Markdown Body (Preview Styles) ---------- */
.markdown-body {
    font-family: var(--preview-font-body);
    font-size: var(--preview-font-size);
    line-height: var(--preview-line-height);
    color: var(--preview-text);
    word-wrap: break-word;
    overflow-wrap: break-word;
}
.markdown-body > *:first-child { margin-top: 0; }
.markdown-body > *:last-child { margin-bottom: 0; }

/* Headings */
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
    font-family: var(--preview-font-heading);
    color: var(--preview-heading);
    font-weight: 600;
    line-height: 1.3;
    margin-top: 1.5em;
    margin-bottom: 0.6em;
}
.markdown-body h1 { font-size: 2em; padding-bottom: 0.3em; border-bottom: 1px solid var(--preview-border); }
.markdown-body h2 { font-size: 1.5em; padding-bottom: 0.25em; border-bottom: 1px solid var(--preview-border); }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body h4 { font-size: 1em; }
.markdown-body h5 { font-size: 0.875em; }
.markdown-body h6 { font-size: 0.85em; color: var(--preview-text-secondary); }

/* Paragraphs */
.markdown-body p { margin-bottom: var(--preview-paragraph-spacing); }

/* Links */
.markdown-body a {
    color: var(--preview-link);
    text-decoration: none;
}
.markdown-body a:hover { text-decoration: underline; }

/* Strong & Em */
.markdown-body strong { font-weight: 600; }
.markdown-body em { font-style: italic; }
.markdown-body del { color: var(--preview-text-secondary); }

/* Lists */
.markdown-body ul, .markdown-body ol {
    margin-bottom: var(--preview-paragraph-spacing);
    padding-left: 2em;
}
.markdown-body li { margin-bottom: 0.3em; }
.markdown-body li > p { margin-bottom: 0.4em; }
.markdown-body li > ul, .markdown-body li > ol { margin-top: 0.3em; margin-bottom: 0; }

/* Task lists */
.markdown-body .task-list-item {
    list-style: none;
    margin-left: -1.5em;
    padding-left: 0;
}
.markdown-body .task-list-item input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.12em;
    height: 1.12em;
    margin-right: 0.55em;
    border-radius: 0.42em;
    border: 2px solid var(--preview-link);
    background: transparent;
    vertical-align: middle;
    position: relative;
    top: -0.02em;
    display: inline-flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--preview-link) 32%, transparent);
    transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.markdown-body .task-list-item input[type="checkbox"]::after {
    content: "";
    width: 0.3em;
    height: 0.56em;
    border: 0.14em solid var(--preview-link);
    border-top: 0;
    border-left: 0;
    transform: rotate(45deg) scale(1);
    opacity: 0;
    transition: opacity 0.15s ease;
}
.markdown-body .task-list-item input[type="checkbox"]:checked {
    background: transparent;
    border-color: var(--preview-link);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--preview-link) 32%, transparent);
}
.markdown-body .task-list-item input[type="checkbox"]:checked::after {
    opacity: 1;
}
.markdown-body .task-list-item input[type="checkbox"]:disabled {
    opacity: 1;
    cursor: default;
}

/* Blockquotes */
.markdown-body blockquote {
    margin: 0 0 var(--preview-paragraph-spacing);
    padding: 0.5em 1em;
    border-left: 4px solid var(--preview-blockquote-border);
    color: var(--preview-blockquote-text);
}
.markdown-body blockquote > *:last-child { margin-bottom: 0; }

/* Horizontal Rule */
.markdown-body hr {
    border: none;
    height: 2px;
    background: var(--preview-hr);
    margin: 1.5em 0;
}

/* Images */
.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

/* Inline Code */
.markdown-body code {
    font-family: var(--preview-font-code);
    font-size: 0.875em;
    padding: 0.2em 0.4em;
    background: var(--preview-code-bg);
    border-radius: 4px;
    color: var(--preview-code-text);
}

/* Code Blocks */
.markdown-body .code-block {
    margin-bottom: var(--preview-paragraph-spacing);
    border: 1px solid var(--preview-border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--preview-code-bg);
}
.markdown-body .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px;
    background: rgba(0,0,0,0.03);
    border-bottom: 1px solid var(--preview-border);
    font-size: 12px;
}
.markdown-body .code-lang {
    color: var(--preview-text-secondary);
    font-family: var(--preview-font-code);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.markdown-body .copy-btn {
    padding: 2px 10px;
    border: 1px solid var(--preview-border);
    border-radius: 4px;
    background: var(--preview-bg);
    color: var(--preview-text-secondary);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}
.markdown-body .copy-btn:hover { background: #eaeef2; color: #1f2328; }
.markdown-body .copy-btn.copied { background: #dafbe1; color: #1a7f37; border-color: #a6e3a1; }
.markdown-body pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    line-height: 1.5;
}
.markdown-body pre code {
    padding: 0;
    background: transparent;
    border-radius: 0;
    font-size: 13px;
    line-height: 1.5;
}

/* Tables */
.markdown-body .table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--preview-paragraph-spacing);
    border: 1px solid var(--preview-table-border);
    border-radius: 8px;
}
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
}
.markdown-body th, .markdown-body td {
    padding: 8px 14px;
    border: 1px solid var(--preview-table-border);
    text-align: left;
}
.markdown-body th {
    font-weight: 600;
    background: var(--preview-table-stripe);
}
.markdown-body tr:nth-child(even) { background: var(--preview-table-stripe); }
.markdown-body .table-wrapper table { border: none; }
.markdown-body .table-wrapper th:first-child,
.markdown-body .table-wrapper td:first-child { border-left: none; }
.markdown-body .table-wrapper th:last-child,
.markdown-body .table-wrapper td:last-child { border-right: none; }
.markdown-body .table-wrapper tr:first-child th { border-top: none; }
.markdown-body .table-wrapper tr:last-child td { border-bottom: none; }

/* Callouts */
.callout {
    margin-bottom: var(--preview-paragraph-spacing);
    padding: 12px 16px;
    border-radius: 8px;
    border-left: 4px solid;
}
.callout-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 0.9em;
    margin-bottom: 6px;
}
.callout-body > *:last-child { margin-bottom: 0; }
.callout-note { background: #ddf4ff; border-color: #0969da; }
.callout-note .callout-title { color: #0969da; }
.callout-tip { background: #dafbe1; border-color: #1a7f37; }
.callout-tip .callout-title { color: #1a7f37; }
.callout-warning { background: #fff8c5; border-color: #bf8700; }
.callout-warning .callout-title { color: #9a6700; }
.callout-important { background: #ffebe9; border-color: #cf222e; }
.callout-important .callout-title { color: #cf222e; }
.callout-caution { background: #fff1e5; border-color: #bc4c00; }
.callout-caution .callout-title { color: #bc4c00; }

/* Footnotes */
.footnotes {
    margin-top: 2em;
    font-size: 0.9em;
    color: var(--preview-text-secondary);
}
.footnotes hr { margin-bottom: 1em; }
.footnotes ol { padding-left: 1.5em; }
.footnote-ref a {
    color: var(--preview-link);
    text-decoration: none;
    font-weight: 600;
}
.footnote-backref { text-decoration: none; margin-left: 4px; }

/* Details / Summary */
.markdown-body details {
    margin-bottom: var(--preview-paragraph-spacing);
    border: 1px solid var(--preview-border);
    border-radius: 8px;
    padding: 12px 16px;
}
.markdown-body summary {
    cursor: pointer;
    font-weight: 600;
    user-select: none;
}
.markdown-body details[open] summary { margin-bottom: 8px; }

/* Math */
.math-display {
    text-align: center;
    margin: 1em 0;
    overflow-x: auto;
}
.math-inline { display: inline; }
.math-error {
    color: #cf222e;
    font-family: var(--preview-font-code);
    font-size: 0.9em;
}

/* Mermaid */
.mermaid-block {
    margin: 1em 0;
    text-align: center;
    overflow-x: auto;
}
.mermaid-block svg { max-width: 100%; }
.mermaid-error {
    padding: 12px;
    background: #ffebe9;
    border-radius: 6px;
    color: #cf222e;
    font-size: 0.9em;
}

/* Emoji */
.emoji { font-style: normal; }

/* Sup / Sub */
.markdown-body sup, .markdown-body sub {
    font-size: 0.8em;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}
.markdown-body sup { top: -0.5em; }
.markdown-body sub { bottom: -0.25em; }

/* kbd */
.markdown-body kbd {
    font-family: var(--preview-font-code);
    font-size: 0.85em;
    padding: 2px 6px;
    border: 1px solid var(--preview-border);
    border-radius: 4px;
    background: var(--preview-code-bg);
    box-shadow: inset 0 -1px 0 var(--preview-border);
}

/* mark */
.markdown-body mark {
    background: #fff8c5;
    padding: 0.1em 0.3em;
    border-radius: 3px;
}

/* Attribution badge (hidden in preview) */
.markdown-body .attribution-badge { display: none; }

/* ---------- Drawer Menu ---------- */
.drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--ui-overlay);
    z-index: 450;
}
.drawer-overlay.open { display: block; }
.drawer-panel {
    position: absolute;
    top: 0;
    left: 0;
    width: min(360px, 92vw);
    height: 100%;
    background: var(--ui-bg-secondary);
    border-right: 1px solid var(--ui-border);
    box-shadow: 0 10px 30px var(--ui-shadow-heavy);
    display: flex;
    flex-direction: column;
}
.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    border-bottom: 1px solid var(--ui-border);
}
.drawer-header h3 {
    margin: 0;
    font-size: 15px;
    color: var(--ui-text);
}
.drawer-nav {
    display: flex;
    gap: 6px;
    padding: 10px;
    border-bottom: 1px solid var(--ui-border);
}
.drawer-nav-btn {
    border: 1px solid var(--ui-border);
    background: var(--ui-bg);
    color: var(--ui-text-secondary);
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 12px;
    cursor: pointer;
}
.drawer-nav-btn.active {
    color: var(--ui-accent);
    border-color: var(--ui-accent);
    background: var(--ui-accent-bg);
}
.drawer-body {
    padding: 14px;
    overflow-y: auto;
}
.drawer-page { display: none; }
.drawer-page.active { display: block; }
.drawer-page h4 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--ui-text);
}
.drawer-page p, .drawer-page li {
    font-size: 13px;
    color: var(--ui-text-secondary);
    line-height: 1.6;
}
.drawer-page ul {
    margin: 0;
    padding-left: 18px;
}
.drawer-page kbd {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 1px 5px;
    border: 1px solid var(--ui-border);
    border-radius: 4px;
    background: var(--ui-bg-tertiary);
    color: var(--ui-text-secondary);
}

/* ---------- Modal ---------- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--ui-overlay);
    z-index: 500;
    align-items: center;
    justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-dialog {
    background: var(--ui-bg);
    border-radius: 12px;
    box-shadow: 0 8px 32px var(--ui-shadow-heavy);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow: auto;
}
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--ui-border);
}
.modal-header h3 { font-size: 16px; font-weight: 600; color: var(--ui-text); }
.modal-close {
    width: 30px; height: 30px;
    border: none;
    border-radius: 6px;
    background: transparent;
    font-size: 20px;
    color: var(--ui-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-close:hover { background: var(--ui-hover); }
.modal-body { padding: 20px; }
.modal-body textarea {
    width: 100%;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    padding: 12px;
    resize: vertical;
    outline: none;
    margin-bottom: 12px;
    background: var(--ui-bg-secondary);
    color: var(--ui-text);
}
.modal-body textarea:focus { border-color: var(--ui-accent); }
.modal-body textarea:focus-visible {
    outline: 2px solid var(--ui-accent);
    outline-offset: 1px;
}

/* Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    padding: 0 16px;
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}
.btn-primary {
    background: var(--ui-accent);
    color: #ffffff;
    border-color: var(--ui-accent);
}
.btn-primary:hover { background: #0860c4; }

/* ---------- Status Indicator ---------- */
.save-status {
    position: fixed;
    bottom: 16px;
    right: 16px;
    padding: 6px 14px;
    background: #1f2328;
    color: #ffffff;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s, transform 0.2s;
    z-index: 300;
    pointer-events: none;
}
.save-status.show {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Print Styles ---------- */
@media print {
    #app-header, #tab-bar, #toc-sidebar, #editor-panel,
    #panel-divider, .save-status, #inline-editor { display: none !important; }
    #preview-panel {
        overflow: visible !important;
        flex: 1 !important;
        display: block !important;
    }
    #preview-content { padding: 0; max-width: none; }
    body { overflow: visible; }
    #app { height: auto; overflow: visible; }
    #main-content { height: auto; overflow: visible; }
    .code-block { break-inside: avoid; }
    .callout { break-inside: avoid; }
    .table-wrapper { break-inside: avoid; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .mode-btn span { display: none; }
    .toolbar-btn span { display: none; }
    .toolbar-btn { padding: 0 8px; }
    .logo span { display: none; }
    #toc-sidebar { width: 200px; min-width: 160px; }
    #doc-stats { display: none; }
    #tab-bar-right { border-left: none; padding-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }
}
@media (max-width: 640px) {
    #toc-sidebar {
        display: flex;
        position: fixed;
        top: 84px;
        right: 0;
        bottom: 0;
        width: min(82vw, 320px);
        min-width: 240px;
        z-index: 380;
        box-shadow: -10px 0 24px var(--ui-shadow-heavy);
        transform: translateX(100%);
        opacity: 0;
        pointer-events: none;
        border-left: 1px solid var(--ui-border);
        border-right: none;
        transition: transform 0.2s ease, opacity 0.2s ease;
    }
    #toc-sidebar.hidden {
        width: min(82vw, 320px);
        min-width: 240px;
        border-left: 1px solid var(--ui-border);
        opacity: 0;
        pointer-events: none;
    }
    #preview-content { padding: 16px 20px; }
    #editor { padding: 16px 20px; }
    .mode-switcher { gap: 0; padding: 2px; }
    .mode-btn { padding: 0 8px; }
    #tab-bar-right { gap: 2px; }
}

/* ---------- Scrollbar ---------- */
#preview-panel::-webkit-scrollbar,
#editor::-webkit-scrollbar,
#toc-nav::-webkit-scrollbar {
    width: 8px;
}
#preview-panel::-webkit-scrollbar-track,
#editor::-webkit-scrollbar-track,
#toc-nav::-webkit-scrollbar-track {
    background: transparent;
}
#preview-panel::-webkit-scrollbar-thumb,
#editor::-webkit-scrollbar-thumb,
#toc-nav::-webkit-scrollbar-thumb {
    background: var(--ui-scrollbar);
    border-radius: 4px;
}
#preview-panel::-webkit-scrollbar-thumb:hover,
#editor::-webkit-scrollbar-thumb:hover,
#toc-nav::-webkit-scrollbar-thumb:hover {
    background: var(--ui-scrollbar-hover);
}

/* ---------- Drag over ---------- */
#app.drag-over::after {
    content: 'Drop .md file here';
    position: fixed;
    inset: 0;
    background: rgba(9, 105, 218, 0.08);
    border: 3px dashed var(--ui-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 600;
    color: var(--ui-accent);
    z-index: 999;
    pointer-events: none;
}

/* ---------- Appearance Toggle Icons ---------- */
[data-appearance="light"] .icon-light { display: inline !important; }
[data-appearance="light"] .icon-dark,
[data-appearance="light"] .icon-system { display: none !important; }
[data-appearance="dark"] .icon-dark { display: inline !important; }
[data-appearance="dark"] .icon-light,
[data-appearance="dark"] .icon-system { display: none !important; }
[data-appearance="system"] .icon-system { display: inline !important; }
[data-appearance="system"] .icon-light,
[data-appearance="system"] .icon-dark { display: none !important; }

/* ---------- Dark overlay for drag ---------- */
[data-appearance="dark"] #app.drag-over::after {
    background: rgba(88, 166, 255, 0.08);
}

/* ---------- Save status dark ---------- */
[data-appearance="dark"] .save-status {
    background: #e6edf3;
    color: #0d1117;
}

/* ---------- Editor placeholder dark ---------- */
[data-appearance="dark"] #editor::placeholder { color: #484f58; }

/* ---------- Inline mode (full document editor) ---------- */
.inline-doc-shell {
    max-width: var(--preview-max-width);
    margin: 0 auto;
    padding: 0 20px 20px;
}

.inline-block-editor {
    width: 100%;
    min-height: calc(100vh - 240px);
    padding: 20px 24px;
    border: 1px solid var(--ui-accent);
    border-radius: 10px;
    font-family: var(--preview-font-body, 'Inter', sans-serif);
    font-size: var(--preview-font-size, 16px);
    line-height: var(--preview-line-height, 1.6);
    outline: none;
    background: var(--preview-bg, var(--ui-bg-secondary));
    color: var(--preview-text, var(--ui-editor-text));
    overflow-wrap: break-word;
    caret-color: var(--ui-accent);
    box-shadow: 0 8px 32px var(--ui-shadow);
}
.inline-block-editor:focus-visible {
    outline: 2px solid var(--ui-accent);
    outline-offset: 1px;
}
.inline-editor-toolbar {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    padding: 10px;
    margin-bottom: 12px;
    font-size: 11px;
    color: var(--ui-text-secondary);
    border: 1px solid var(--ui-border);
    border-radius: 10px;
    background: color-mix(in srgb, var(--ui-bg-secondary) 90%, var(--ui-bg));
    box-shadow: 0 4px 20px var(--ui-shadow);
    backdrop-filter: blur(6px);
    z-index: 2;
}
.inline-tool-btn {
    min-width: 30px;
    height: 30px;
    padding: 0 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--ui-border);
    border-radius: 5px;
    background: var(--ui-bg);
    color: var(--ui-text-secondary);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.01em;
}
.inline-tool-btn:hover {
    color: var(--ui-accent);
    border-color: var(--ui-accent);
    background: var(--ui-accent-bg);
}
.inline-tool-btn.is-active {
    color: var(--ui-accent);
    border-color: var(--ui-accent);
    background: color-mix(in srgb, var(--ui-accent-bg) 75%, var(--ui-bg));
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ui-accent) 35%, transparent);
}
.inline-tool-sep {
    width: 1px;
    height: 18px;
    background: var(--ui-border);
    margin: 0 2px;
}
.inline-tool-hint {
    margin-left: auto;
    font-size: 11px;
    color: var(--ui-text-secondary);
    white-space: nowrap;
}
.inline-tool-btn[data-cmd="strike"] {
    text-decoration: line-through;
    text-decoration-thickness: 1.5px;
}
.inline-doc-editor p:empty::before {
    content: 'Start writing...';
    color: var(--ui-text-secondary);
}
.inline-block-editor h1,
.inline-block-editor h2,
.inline-block-editor h3,
.inline-block-editor h4,
.inline-block-editor h5,
.inline-block-editor h6,
.inline-block-editor p,
.inline-block-editor ul,
.inline-block-editor ol,
.inline-block-editor blockquote {
    margin-top: 0;
    margin-bottom: 0.7em;
}
.inline-block-editor code {
    background: var(--ui-bg-tertiary);
    padding: 1px 4px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.92em;
}
.inline-block-editor blockquote {
    border-left: 3px solid var(--ui-border);
    margin-left: 0;
    padding-left: 10px;
    color: var(--ui-text-secondary);
}

@media (max-width: 900px) {
    .inline-tool-hint { display: none; }
    .inline-tool-btn {
        min-width: 28px;
        height: 28px;
        padding: 0 6px;
        font-size: 11px;
    }
}