:root {
    /* ===== Color System ===== */
    --bg-color: #ffffff;
    --text-color: #3d4852;
    --heading-color: #1a2332;
    --heading-secondary: #2c3e50;
    --link-color: #3b82c4;
    --link-hover: #2563a0;
    --border-color: #e2e8f0;
    --border-light: #eef2f7;
    --code-bg: #f6f8fb;
    --code-text: #c7254e;
    --blockquote-bg: #f8fafc;
    --blockquote-border: #94a3b8;
    --blockquote-text: #5a6872;
    --table-header-bg: #f1f5f9;
    --table-stripe-bg: #f8fafc;
    --table-border: #e2e8f0;
    --mark-bg: #fef3cd;
    --selection-bg: #d4e4f7;
    --meta-color: #8896a4;
    --hr-color: #d1d9e0;
    --shadow-light: rgba(0, 0, 0, 0.04);

    /* ===== Typography ===== */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    --font-size-base: 15px;
    --line-height: 1.75;
}

/* ===== Base Layout ===== */
html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

#write {
    max-width: 860px;
    padding: 2em 2.5em;
    margin: 0 auto;
}

/* ===== Headings ===== */
h1, h2, h3, h4, h5, h6 {
    color: var(--heading-color);
    font-weight: 600;
    line-height: 1.35;
    margin-top: 1.8em;
    margin-bottom: 0.65em;
    position: relative;
}

h1 {
    font-size: 2em;
    font-weight: 700;
    margin-top: 1.2em;
    padding-bottom: 0.35em;
    border-bottom: 2px solid var(--border-color);
    color: var(--heading-color);
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.55em;
    font-weight: 650;
    padding-bottom: 0.25em;
    border-bottom: 1px solid var(--border-light);
    color: var(--heading-secondary);
}

h3 {
    font-size: 1.3em;
    color: var(--heading-secondary);
}

h4 {
    font-size: 1.12em;
    color: var(--heading-secondary);
}

h5 {
    font-size: 1em;
    color: #5a6872;
}

h6 {
    font-size: 0.92em;
    color: #6b7a88;
    font-weight: 500;
}

/* Heading hover effect */
h1:hover::after,
h2:hover::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--link-color);
    border-radius: 1px;
}

/* ===== Paragraphs & Text ===== */
p {
    margin: 0 0 1em 0;
    line-height: var(--line-height);
}

strong {
    font-weight: 600;
    color: #2c3644;
}

em {
    font-style: italic;
}

del {
    color: #94a3b8;
    text-decoration: line-through;
}

mark {
    background-color: var(--mark-bg);
    padding: 0.15em 0.35em;
    border-radius: 3px;
    color: #7c6200;
}

/* ===== Links ===== */
a {
    color: var(--link-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

/* ===== Lists ===== */
ul, ol {
    margin: 0 0 1em 0;
    padding-left: 1.8em;
}

li {
    margin-bottom: 0.35em;
    line-height: 1.7;
}

li > p {
    margin-bottom: 0.4em;
}

ul ul, ol ol, ul ol, ol ul {
    margin-top: 0.3em;
    margin-bottom: 0.3em;
}

/* Custom bullet style */
ul > li::marker {
    color: #94a3b8;
}

ol > li::marker {
    color: var(--heading-secondary);
    font-weight: 500;
}

/* Task list */
.task-list-item {
    list-style: none;
    margin-left: -1.5em;
    padding-left: 0;
}

.task-list-item input[type="checkbox"] {
    margin-right: 0.5em;
    vertical-align: middle;
    accent-color: var(--link-color);
}

/* ===== Blockquotes ===== */
blockquote {
    margin: 1em 0;
    padding: 0.8em 1.2em;
    border-left: 4px solid var(--blockquote-border);
    background-color: var(--blockquote-bg);
    border-radius: 0 6px 6px 0;
    color: var(--blockquote-text);
}

blockquote p {
    margin-bottom: 0.5em;
}

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

blockquote blockquote {
    margin-top: 0.6em;
    border-left-color: #cbd5e1;
}

/* ===== Code ===== */
code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 0.2em 0.45em;
    border-radius: 4px;
    font-weight: 400;
}

pre {
    margin: 1.2em 0;
    padding: 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px var(--shadow-light);
}

pre code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background-color: var(--code-bg);
    color: #3d4852;
    padding: 1.2em 1.4em;
    line-height: 1.65;
    border-radius: 8px;
    display: block;
    overflow-x: auto;
}

/* md-fences for Typora */
.md-fences {
    background-color: var(--code-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 0.5em 0;
    margin: 1.2em 0;
    font-family: var(--font-mono);
    font-size: 0.88em;
    box-shadow: 0 1px 3px var(--shadow-light);
}

.md-fences .CodeMirror-wrap {
    border-radius: 8px;
}

.CodeMirror-lines {
    padding-left: 4px;
}

/* Fix horizontal line artifacts between code lines */
.md-fences .CodeMirror pre.CodeMirror-line,
.md-fences .CodeMirror pre.CodeMirror-line-like {
    background: transparent;
}

.CodeMirror-sizer {
    border-right: 0;
}

.md-fences::before {
    content: '';
    display: block;
    padding: 8px 12px;
    background: var(--table-header-bg);
    border-bottom: 1px solid var(--border-light);
    border-radius: 8px 8px 0 0;
}

/* Code block language label */
.md-fences[lang]::before {
    content: attr(lang);
    display: block;
    padding: 6px 14px;
    background: var(--table-header-bg);
    border-bottom: 1px solid var(--border-light);
    border-radius: 8px 8px 0 0;
    color: var(--meta-color);
    font-family: var(--font-mono);
    font-size: 0.78em;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== Syntax Highlighting ===== */

/*
 * Color Palette (light-bg optimized)
 * ----------------------------------
 * Keywords:     #7c3aed  (violet)
 * Strings:      #15803d  (green-700)
 * Comments:     #94a3b8  (slate-400, italic)
 * Numbers:      #c2410c  (orange-700)
 * Functions:    #2563eb  (blue-600)
 * Operators:    #0d9488  (teal-600)
 * Types/Classes:#0891b2  (cyan-600)
 * Decorators:   #d97706  (amber-600)
 * Tags (HTML):  #be185d  (pink-700)
 * Attributes:   #7c3aed  (violet)
 * Punctuation:  #64748b  (slate-500)
 * Regex:        #c2410c  (orange)
 * Variables:    #b45309  (amber-800)
 * Base text:    #3d4852
 */

/* --- CodeMirror tokens (Typora native) --- */

/* Keywords: def, if, else, import, class, return, for, while, try, except, const, let, var, function ... */
.cm-keyword { color: #7c3aed; font-weight: 500; }

/* Strings: "hello", 'world', `template` */
.cm-string,
.cm-string-2 { color: #15803d; }

/* Comments: # comment, // comment, /* comment */
.cm-comment { color: #94a3b8; font-style: italic; }

/* Numbers: 42, 3.14, 0xff, 1e10 */
.cm-number { color: #c2410c; }

/* Operators: +, -, *, =, ==, !=, =>, &&, || */
.cm-operator { color: #0d9488; }

/* Function calls */
.cm-def,
.cm-meta { color: #2563eb; }

/* Variables & properties */
.cm-variable { color: #3d4852; }
.cm-variable-2 { color: #b45309; }
.cm-variable-3 { color: #0891b2; }
.cm-qualifier { color: #0891b2; }

/* Types & built-ins: int, str, list, dict, None, True, False, console, document ... */
.cm-type { color: #0891b2; }
.cm-builtin { color: #0891b2; font-weight: 500; }
.cm-atom { color: #c2410c; font-weight: 500; }  /* booleans, null, undefined */

/* Tags (HTML/XML) */
.cm-tag { color: #be185d; }
.cm-attribute { color: #7c3aed; }
.cm-bracket { color: #64748b; }

/* Punctuation */
.cm-punctuation,
.cm-delimiter { color: #64748b; }

/* Header (Markdown in code) */
.cm-header { color: #1a2332; font-weight: 600; }

/* Link */
.cm-link { color: #3b82c4; text-decoration: none; }
.cm-url { color: #94a3b8; }

/* Error */
.cm-error { color: #dc2626; background-color: #fef2f2; border-radius: 2px; }

/* Matching bracket highlight */
.cm-matchingbracket {
    color: #7c3aed !important;
    background-color: #ede9fe;
    border-radius: 2px;
    font-weight: 600;
}

/* Active line - disabled (no highlight) */
.CodeMirror-activeline-background,
.CodeMirror-activeline-gutter {
    background-color: transparent !important;
}

/* Line numbers */
.CodeMirror-linenumber {
    color: #c4cdd5;
}

/* Cursor */
.CodeMirror-cursor {
    border-left-color: #3b82c4 !important;
}

/* Selection in code editor */
.CodeMirror-selected {
    background-color: #d4e4f7 !important;
}

/* --- Generic highlighter tokens (Prism / highlight.js / Pygments fallback) --- */

.token.keyword,
.hljs-keyword,
.highlight .k,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .kt { color: #7c3aed; font-weight: 500; }

.token.string,
.token.char,
.hljs-string,
.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx,
.highlight .sr,
.highlight .ss { color: #15803d; }

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata,
.hljs-comment,
.highlight .c,
.highlight .c1,
.highlight .cm,
.highlight .ch,
.highlight .cp,
.highlight .cpf,
.highlight .cs { color: #94a3b8; font-style: italic; }

.token.number,
.token.boolean,
.hljs-number,
.hljs-literal,
.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo,
.highlight .il,
.highlight .kc { color: #c2410c; }

.token.function,
.hljs-function,
.hljs-title,
.highlight .nf,
.highlight .fm { color: #2563eb; }

.token.operator,
.hljs-operator,
.highlight .o,
.highlight .ow { color: #0d9488; }

.token.class-name,
.token.builtin,
.hljs-class,
.hljs-built_in,
.highlight .nc,
.highlight .ni,
.highlight .nn { color: #0891b2; font-weight: 500; }

.token.decorator,
.token.annotation,
.highlight .nd { color: #d97706; }

.token.tag,
.hljs-tag,
.highlight .nt,
.highlight .na { color: #be185d; }

.token.attr-name,
.hljs-attr,
.highlight .na { color: #7c3aed; }

.token.attr-value,
.hljs-attr-value { color: #15803d; }

.token.punctuation,
.hljs-punctuation,
.highlight .p { color: #64748b; }

.token.regex,
.hljs-regexp { color: #c2410c; }

.token.variable,
.hljs-variable,
.highlight .nv,
.highlight .vc,
.highlight .vg,
.highlight .vi { color: #b45309; }

.token.property,
.hljs-property { color: #3d4852; }

.token.parameter,
.hljs-params,
.highlight .bp { color: #3d4852; }

.token.selector,
.hljs-selector-tag,
.hljs-selector-class,
.hljs-selector-id { color: #be185d; font-weight: 500; }

.token.important,
.hljs-emphasis { color: #7c3aed; font-weight: 600; }

.token.inserted,
.hljs-addition { color: #15803d; background-color: #ecfdf5; border-radius: 2px; }

.token.deleted,
.hljs-deletion { color: #dc2626; background-color: #fef2f2; border-radius: 2px; }

.token.changed,
.hljs-modified { color: #d97706; background-color: #fffbeb; border-radius: 2px; }

/* Language-specific overrides */

/* Python: self, cls */
.cm-variable.cm-special { color: #0891b2; font-style: italic; }

/* JSON: keys */
.cm-property { color: #2563eb; }

/* CSS: selectors and values */
.cm-css-property { color: #0d9488; }
.cm-css-value { color: #c2410c; }
.cm-css-selector { color: #be185d; }

/* Shell / Bash */
.cm-shell-keyword { color: #7c3aed; }

/* SQL */
.cm-sql-keyword { color: #7c3aed; text-transform: uppercase; }

/* Diff */
.cm-diff-added { color: #15803d; background-color: #ecfdf5; }
.cm-diff-removed { color: #dc2626; background-color: #fef2f2; }

/* ===== Tables ===== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.2em 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px var(--shadow-light);
    font-size: 0.93em;
}

thead {
    background-color: var(--table-header-bg);
}

th {
    padding: 0.75em 1em;
    text-align: left;
    font-weight: 600;
    color: var(--heading-secondary);
    border-bottom: 2px solid var(--table-border);
    white-space: nowrap;
}

td {
    padding: 0.65em 1em;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-color);
    vertical-align: top;
}

tr:nth-child(even) {
    background-color: var(--table-stripe-bg);
}

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

tr:hover {
    background-color: #eef4fb;
}

/* ===== Horizontal Rules ===== */
hr {
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--hr-color), transparent);
    margin: 2.5em 0;
}

/* ===== Images ===== */
img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 1em 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Image caption */
img + em,
figure figcaption {
    display: block;
    text-align: center;
    font-size: 0.85em;
    color: var(--meta-color);
    margin-top: 0.5em;
}

/* ===== Footnotes ===== */
.footnotes-area {
    margin-top: 2em;
    padding-top: 1em;
    border-top: 1px solid var(--border-color);
    font-size: 0.88em;
    color: var(--meta-color);
}

.footnotes-area ol {
    padding-left: 1.5em;
}

sup.md-footnote {
    color: var(--link-color);
    font-size: 0.78em;
}

/* ===== Table of Contents ===== */
.md-toc {
    margin: 1.5em 0;
    padding: 1em 1.5em;
    background-color: var(--blockquote-bg);
    border-radius: 8px;
    border: 1px solid var(--border-light);
}

.md-toc-content {
    padding-left: 0.5em;
}

.md-toc-item {
    margin: 0.3em 0;
}

.md-toc-link {
    color: var(--heading-secondary);
    font-weight: 500;
    border-bottom: none;
}

.md-toc-link:hover {
    color: var(--link-color);
}

/* ===== Math (KaTeX) ===== */
.md-math-block {
    margin: 1.2em 0;
    text-align: center;
    font-size: 1.05em;
}

/* ===== Definition Lists ===== */
dt {
    font-weight: 600;
    color: var(--heading-secondary);
    margin-top: 0.8em;
}

dd {
    margin-left: 1.5em;
    margin-bottom: 0.5em;
    color: var(--text-color);
}

/* ===== Selection ===== */
::selection {
    background-color: var(--selection-bg);
    color: inherit;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #c4cdd5;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a0aab4;
}

/* ===== Print ===== */
@media print {
    html {
        font-size: 12pt;
    }

    #write {
        max-width: 100%;
        padding: 0;
    }

    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }

    pre, blockquote, table {
        page-break-inside: avoid;
    }

    img {
        page-break-inside: avoid;
    }

    a {
        color: var(--link-color);
    }

    a::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #8896a4;
    }
}

/* ===== Typora-Specific: Source Code Mode ===== */
#typora-source {
    font-family: var(--font-mono);
    font-size: 0.92em;
    line-height: 1.6;
    color: #4a5568;
}

/* ===== Typora-Specific: Outline / Sidebar ===== */
.outline-item {
    font-size: 0.88em;
    padding: 2px 8px;
    border-radius: 4px;
    transition: background-color 0.15s ease;
}

.outline-item:hover {
    background-color: var(--table-stripe-bg);
}

.outline-item-active {
    background-color: #e8f0fe;
    color: var(--link-color);
    font-weight: 500;
}

/* ===== Typora-Specific: Diagrams (Mermaid etc.) ===== */
.md-diagram {
    margin: 1.5em 0;
    text-align: center;
}

/* ===== Transition / Animations ===== */
h1, h2, h3, h4, h5, h6,
a, blockquote, table {
    transition: all 0.2s ease;
}

/* Exclude code/pre from transition to avoid line artifacts in CodeMirror */
code, pre, .md-fences,
.CodeMirror, .CodeMirror-line,
.CodeMirror-code, .CodeMirror-sizer {
    transition: none !important;
}

/* ===== Focus Mode ===== */
/*
 * Focus mode dims all blocks except the one currently being edited,
 * helping you concentrate on the current paragraph/heading/list.
 */
#write.on-focus-mode .md-end-block:not(.md-focus),
#write.on-focus-mode .md-end-block:not(.md-focus) .md-line {
    opacity: 0.35;
    transition: opacity 0.4s ease;
}

#write.on-focus-mode .md-end-block.md-focus,
#write.on-focus-mode .md-end-block.md-focus .md-line {
    opacity: 1;
    transition: opacity 0.2s ease;
}

/* Siblings of focused block also stay slightly more visible */
#write.on-focus-mode .md-end-block.md-focus ~ .md-end-block {
    opacity: 0.25;
}

/* Headings in focus mode stay slightly more visible than body text */
#write.on-focus-mode h1:not(.md-focus),
#write.on-focus-mode h2:not(.md-focus),
#write.on-focus-mode h3:not(.md-focus) {
    opacity: 0.45;
}

/* ===== Typewriter Mode ===== */
/*
 * Typewriter mode keeps the current line near the vertical center
 * of the editor and dims non-active lines in the code editor.
 */
#write.on-typewriter-mode .md-end-block:not(.md-focus) {
    opacity: 0.45;
    transition: opacity 0.35s ease;
}

#write.on-typewriter-mode .md-end-block.md-focus {
    opacity: 1;
    transition: opacity 0.15s ease;
}

/* CodeMirror lines in typewriter mode - keep normal opacity */
.CodeMirror.cm-s-typora-default .CodeMirror-line {
    opacity: 1;
}

/* ===== Keyboard Tag (<kbd>) ===== */
kbd {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.82em;
    line-height: 1;
    color: var(--heading-secondary);
    background-color: #f8fafc;
    border: 1px solid #d1d9e0;
    border-bottom-width: 2px;
    border-radius: 4px;
    padding: 0.15em 0.45em;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
    white-space: nowrap;
    vertical-align: baseline;
}

kbd + kbd {
    margin-left: 0.15em;
}

/* Key combo: kbd > kbd or kbd + kbd */
kbd > kbd {
    border: none;
    box-shadow: none;
    padding: 0;
    background: none;
    font-size: 1em;
}

/* ===== YAML Front Matter ===== */
/*
 * Typora renders YAML front matter as: #write pre.md-meta-block
 * The content inside uses CodeMirror with YAML syntax tokens.
 */
#write pre.md-meta-block {
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1em 1.4em;
    margin-bottom: 1.8em;
    margin-top: 0 !important;
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: #5a6872;
    line-height: 1.7;
    box-shadow: 0 1px 3px var(--shadow-light);
    white-space: pre;
    overflow-x: auto;
}

/* YAML key (field name): title, date, categories, etc. */
#write pre.md-meta-block .cm-meta-key,
#write pre.md-meta-block .cm-tag,
#write pre.md-meta-block .cm-atom {
    color: #7c3aed;
    font-weight: 500;
}

/* YAML value (field content) */
#write pre.md-meta-block .cm-meta-value,
#write pre.md-meta-block .cm-string {
    color: #15803d;
}

/* YAML delimiter --- */
#write pre.md-meta-block .cm-meta-delimiter,
#write pre.md-meta-block .cm-hr {
    color: #c4cdd5;
}

/* YAML list items (- Agent) */
#write pre.md-meta-block .cm-variable {
    color: #3d4852;
}

/* YAML number values */
#write pre.md-meta-block .cm-number {
    color: #c2410c;
}

/* YAML boolean (true/false) */
#write pre.md-meta-block .cm-keyword {
    color: #7c3aed;
    font-weight: 500;
}

/* YAML comment (# comment) */
#write pre.md-meta-block .cm-comment {
    color: #94a3b8;
    font-style: italic;
}

/* Prevent code block box-shadow/border from stacking on front matter */
#write pre.md-meta-block {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

/* Front matter focus state (editing) */
#write pre.md-meta-block.md-focus {
    border-color: #c4d4e8;
}

/* Image metadata (not YAML, but uses .md-meta) */
.md-image > .md-meta {
    color: var(--meta-color);
    background: transparent;
    border-radius: 3px;
    padding: 2px 4px;
    font-size: 0.9em;
}

/* ===== Search Highlight ===== */
.md-search-hit {
    background-color: #fef3cd;
    color: #7c6200;
    border-radius: 2px;
    padding: 0 1px;
}

.md-search-select,
.md-search-hit.md-search-select {
    background-color: #f59e0b;
    color: #fff;
    border-radius: 2px;
}

/* Search highlight in code blocks (CodeMirror) */
.cm-searching {
    background-color: #fef3cd !important;
    color: #7c6200 !important;
    border-radius: 2px;
    padding: 1px 0;
}

.cm-searching.cm-search-select {
    background-color: #f59e0b !important;
    color: #fff !important;
}

/* ===== Code Block: Line Numbers ===== */
.md-fences .CodeMirror-linenumber,
pre .CodeMirror-linenumber {
    color: #c4cdd5;
    min-width: 2.5em;
    padding-right: 0.8em;
    text-align: right;
    font-size: 0.82em;
    user-select: none;
}

/* Line number gutter background */
.CodeMirror-gutters {
    background-color: transparent;
    border-right: 1px solid var(--border-light);
}

.CodeMirror-linenumber {
    color: #c4cdd5;
}

/* ===== Code Block: Active Line Highlight ===== */
/* Disabled - no active line highlight */
.CodeMirror-activeline-background {
    background-color: transparent !important;
}

.CodeMirror-activeline-gutter {
    background-color: transparent !important;
}

/* ===== Code Block: Copy Button ===== */
.md-fences-advanced .md-fences-copy-btn,
.code-tooltip .btn {
    background-color: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: #64748b;
    font-size: 0.78em;
    padding: 3px 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.md-fences-advanced .md-fences-copy-btn:hover,
.code-tooltip .btn:hover {
    background-color: #e2e8f0;
    color: #3d4852;
}

/* ===== Code Block: Tooltip / Language Selector ===== */
.code-tooltip {
    background-color: #f8fafc;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.code-tooltip input {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px 8px;
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--text-color);
    background: #fff;
    outline: none;
}

.code-tooltip input:focus {
    border-color: var(--link-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 196, 0.15);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    #write {
        padding: 1.2em 1em;
    }

    h1 {
        font-size: 1.6em;
    }

    h2 {
        font-size: 1.35em;
    }

    table {
        font-size: 0.85em;
    }

    th, td {
        padding: 0.5em 0.7em;
    }
}