/* SPDX-FileCopyrightText: © 2026 isweibin (Jia Weibin) <hi@isweibin.com>
   SPDX-License-Identifier: BSD-3-Clause */

/* === Variables === */
/* Palette: Le Corbusier Polychromie Architecturale (1931 + 1959).
   Light is built on blanc cassé + ocre; dark on terre d'ombre brûlée.
   Dark scheme overrides these via prefers-color-scheme below. */
:root {
    --width: 720px;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    --border-xs: 1px;
    --border-sm: 2px;
    --border-md: 3px;
    --border-lg: 4px;

    --radius-sm: 2px;
    --radius: 3px;

    --font-text: 'Roboto', 'Noto Emoji', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    --font-scale: 1em;

    /* Light scheme — blanc cassé / ocre. */
    --background-color: #f5efe1;          /* blanc cassé, paper                        */
    --heading-color: #1c1b18;             /* noir d'ivoire, ink                        */
    --text-color: #3a342c;                /* terre d'ombre naturelle, deep             */
    --link-color: #3a5a78;                /* bleu outremer, sunken                     */
    --visited-color: #7a5a4a;             /* terre sienne brûlée, light                */
    --code-background-color: #ebe2cc;     /* same family as page, one step deeper      */
    --code-color: #1c1b18;
    --border-color: #cbbfa6;              /* ombre naturelle moyenne, light            */
    --muted-color: #6f6759;               /* gris clair 31, warm                       */
    --blockquote-color: var(--muted-color);
    --blockquote-border: var(--border-color);
    --mark-background-color: #d4b265;     /* jaune vif 31, sunken — "used highlighter" */
    --mark-color: #1c1b18;
    --selection-background: var(--link-color);
    --selection-color: var(--background-color);
    --image-glow: color-mix(in srgb, var(--heading-color) 18%, transparent);

    /* Alert accents.
       For each type the *border* color and the *title* color are the same
       (a single dynamique accent), and the bg is a near-paper wash with a
       faint hint of the same hue. The information lives in the stripe and
       title; the fill is intentionally subdued so the alert reads as
       paper, lightly emphasized. */
    --alert-note-bg:      #ece4d2;     /* paper + cool wash              */
    --alert-note-border:  #3a5a78;     /* bleu outremer                  */
    --alert-tip-bg:       #e8e2cc;     /* paper + green wash             */
    --alert-tip-border:   #5a7a4a;     /* vert anglais 59                */
    --alert-imp-bg:       #ebe1d2;     /* paper + violet wash            */
    --alert-imp-border:   #6e4c6a;     /* violet d'englise 59            */
    --alert-warn-bg:      #ecdfc2;     /* paper + amber wash             */
    --alert-warn-border:  #b87333;     /* orange vif 31, ochre           */
    --alert-cau-bg:       #eadbcb;     /* paper + earth-red wash         */
    --alert-cau-border:   #8a4a3a;     /* terre sienne brûlée, ochre red */
}

:lang(zh-CN), :lang(zh-Hans), :lang(zh) {
    --font-text: 'Roboto', 'Noto Sans SC', 'Noto Emoji', sans-serif;
}

:lang(zh-TW), :lang(zh-HK), :lang(zh-Hant) {
    --font-text: 'Roboto', 'Noto Sans TC', 'Noto Emoji', sans-serif;
}

:lang(ja) {
    --font-text: 'Roboto', 'Noto Sans JP', 'Noto Emoji', sans-serif;
}

:lang(ko) {
    --font-text: 'Roboto', 'Noto Sans KR', 'Noto Emoji', sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Dark scheme — terre d'ombre brûlée, "paper at night". */
        --background-color: #1f1c17;     /* terre d'ombre brûlée 59, deepest */
        --heading-color: #ebe2cc;
        --text-color: #c8bca3;
        --link-color: #a8b8c8;
        --visited-color: #c8a890;
        --code-background-color: #2a2620;
        --code-color: #ebe2cc;
        --border-color: #4a4238;
        --muted-color: #8a8170;
        --blockquote-color: var(--muted-color);
        --blockquote-border: var(--border-color);
        --mark-background-color: #5a4820;
        --mark-color: var(--text-color);
        --image-glow: color-mix(in srgb, var(--text-color) 18%, transparent);

        /* Dark alert tints (same dynamique accents, lifted). */
        --alert-note-bg:      #23211d;
        --alert-note-border:  #7a9ab8;
        --alert-tip-bg:       #22221c;
        --alert-tip-border:   #8aaa7a;
        --alert-imp-bg:       #23201f;
        --alert-imp-border:   #a08aa0;
        --alert-warn-bg:      #26221b;
        --alert-warn-border:  #d4a36a;
        --alert-cau-bg:       #27211e;
        --alert-cau-border:   #b88575;
    }
}

/* === Base === */
body {
    font-family: var(--font-text);
    font-size: var(--font-scale);
    margin: auto;
    padding: var(--space-lg);
    max-width: var(--width);
    text-align: left;
    background-color: var(--background-color);
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.5;
    color: var(--text-color);
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--heading-color);
}

h1, h2 {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
}

h3 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

h4, h5, h6 {
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
}

:is(h1, h2, h3, h4, h5, h6):first-child {
    margin-top: 0;
}

p {
    margin-top: 0;
    margin-bottom: var(--space-md);
}

strong, b {
    color: var(--heading-color);
    font-weight: 600;
}

em, i {
    color: var(--heading-color);
}

mark {
    background-color: var(--mark-background-color);
    color: var(--mark-color);
    padding: 0 var(--space-xs);
    border-radius: var(--radius-sm);
}

sup, sub {
    font-size: 0.75em;
    /* line-height:0 keeps sup/sub from inflating the host line and
       spreading paragraphs apart wherever they appear. */
    line-height: 0;
}

del, s {
    color: var(--muted-color);
}

time {
    color: var(--muted-color);
}

/* Extra space after the post's date line (the <i><time> paragraph). */
article > p:has(> i > time) {
    margin-bottom: var(--space-xl);
}

ul, ol {
    padding-left: var(--space-lg);
    margin-top: 0;
    margin-bottom: var(--space-md);
}

li {
    margin-bottom: var(--space-xs);
}

li ul, li ol {
    margin-top: var(--space-xs);
    margin-bottom: 0;
}

blockquote {
    border-left: var(--border-md) solid var(--blockquote-border);
    color: var(--blockquote-color);
    padding-left: var(--space-md);
    margin: 0 0 var(--space-md) 0;
    font-style: italic;
}

hr {
    border: 0;
    border-top: var(--border-xs) dashed var(--border-color);
}

::selection {
    background: var(--selection-background);
    color: var(--selection-color);
}

/* === Footnotes === */
/* remark-gfm wraps footnotes in <section data-footnotes> with an h2 label.
   The label is kept in the DOM for screen readers but hidden visually. */
section[data-footnotes] {
    margin-top: var(--space-xl);
    font-size: 0.875em;
    color: var(--muted-color);
    border-top: var(--border-xs) dashed var(--border-color);
    padding-top: var(--space-md);
}

section[data-footnotes] h2 {
    /* sr-only: visually hidden, still announced by screen readers. */
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

section[data-footnotes] ol {
    margin-top: 0;
}

section[data-footnotes] li {
    margin-bottom: var(--space-xs);
}

section[data-footnotes] p {
    margin-bottom: var(--space-sm);
}

a.data-footnote-backref {
    text-decoration: none;
    margin-left: var(--space-xs);
}

/* === Table of Contents === */
.table-of-contents {
    font-size: 0.875em;
}

.table-of-contents ul, .table-of-contents li {
    list-style-type: none;
}

/* === Embedded content === */
img {
    max-width: 100%;
    display: block;
    margin: var(--space-lg) auto;
    border-radius: var(--radius);
    filter: drop-shadow(0 0 var(--space-sm) var(--image-glow));
}

/* Escape hatch: <img class="inline"> renders inline at natural size. */
img.inline {
    width: auto !important;
    display: inline-block;
    margin: 0 var(--space-xs);
    vertical-align: middle;
    border-radius: 0;
    filter: none;
}

table {
    margin: var(--space-md) 0;
    border-collapse: collapse;
    border-top: var(--border-sm) solid var(--border-color);
    border-bottom: var(--border-sm) solid var(--border-color);
    font-size: 0.875em;
}

th, td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
}

th {
    font-weight: 600;
    border-bottom: var(--border-xs) solid var(--border-color);
}

/* Wide tables scroll horizontally inside .table-wrapper; cell text never wraps.
   This prioritizes row integrity over line breaks — intentional, not a bug. */
.table-wrapper {
    overflow-x: auto;
    margin: var(--space-md) 0;
}

.table-wrapper table {
    margin: 0;
    width: max-content;
    min-width: 100%;
}

/* === Code === */
code, pre, time {
    font-family: var(--font-mono);
    font-size: 0.875em;
}

code {
    padding: 2px 5px;
    background-color: var(--code-background-color);
    color: var(--code-color);
    border-radius: var(--radius);
}

pre {
    padding: var(--space-md);
    margin: var(--space-md) 0;
    overflow-x: auto;
    line-height: 1.5;
    background-color: var(--code-background-color);
    color: var(--code-color);
    border-radius: var(--radius);
}

pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

/* Block math (KaTeX): centered, scrollable. */
math[display="block"] {
    margin: var(--space-md) auto;
    overflow-x: auto;
    text-align: center;
}

/* Slim, on-palette scrollbars on overflowing blocks. */
pre, math[display="block"] {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

/* === GFM alerts === */
/* remark-github-blockquote-alert renders > [!NOTE] etc. as
   <div class="markdown-alert markdown-alert-{note,tip,important,warning,caution}">.
   The plugin also injects an SVG octicon in the title; we hide it. */
.markdown-alert {
    border-left-width: var(--border-lg);
    border-left-style: solid;
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-md) 0;
}

.markdown-alert > p:last-child {
    margin-bottom: 0;
}

.markdown-alert-title {
    font-weight: 600;
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.markdown-alert-title .octicon {
    display: none;
}

.markdown-alert-note {
    background: var(--alert-note-bg);
    border-left-color: var(--alert-note-border);
}
.markdown-alert-note .markdown-alert-title { color: var(--alert-note-border); }

.markdown-alert-tip {
    background: var(--alert-tip-bg);
    border-left-color: var(--alert-tip-border);
}
.markdown-alert-tip .markdown-alert-title { color: var(--alert-tip-border); }

.markdown-alert-important {
    background: var(--alert-imp-bg);
    border-left-color: var(--alert-imp-border);
}
.markdown-alert-important .markdown-alert-title { color: var(--alert-imp-border); }

.markdown-alert-warning {
    background: var(--alert-warn-bg);
    border-left-color: var(--alert-warn-border);
}
.markdown-alert-warning .markdown-alert-title { color: var(--alert-warn-border); }

.markdown-alert-caution {
    background: var(--alert-cau-bg);
    border-left-color: var(--alert-cau-border);
}
.markdown-alert-caution .markdown-alert-title { color: var(--alert-cau-border); }

/* === Interactive === */
a {
    color: var(--link-color);
    cursor: pointer;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

a:focus-visible, button:focus-visible {
    outline: var(--border-sm) solid var(--link-color);
    outline-offset: var(--border-sm);
    border-radius: var(--radius-sm);
}

/* === Layout components === */
main {
    line-height: 1.75;
}

header {
    margin-bottom: var(--space-xl);
}

footer {
    padding: var(--space-xl) 0;
    text-align: center;
    color: var(--muted-color);
    font-size: 0.875em;
}

footer p { margin-bottom: 0; }

.title, .title:hover {
    text-decoration: none;
}

.title h1 {
    font-size: 1.5em;
    margin: 0 0 var(--space-sm) 0;
}

/* Post list: "date | title" rows; stack vertically on narrow screens. */
ul.blog-posts {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

ul.blog-posts li {
    display: flex;
    margin-bottom: var(--space-sm);
}

ul.blog-posts li span {
    flex: 0 0 160px;
}

ul.blog-posts li a:visited {
    color: var(--visited-color);
}

/* === Responsive === */
/* The 720px breakpoint mirrors --width; @media can't read var(), so keep them in sync. */
@media only screen and (max-width: 720px) {
    ul.blog-posts li { flex-direction: column; }
    ul.blog-posts li span { flex: unset; }

    body {
        padding: var(--space-md);
    }
}