/* ============================================================
   Kassane Engineering Blog — style.css
   Color palette: Srcery (https://srcery-colors.github.io)
   ============================================================ */

/* --- Custom properties ------------------------------------ */

:root {
    /* Srcery base palette */
    --srcery-black: #1C1B19;
    --srcery-red: #EF2F27;
    --srcery-green: #519F50;
    --srcery-yellow: #FBB829;
    --srcery-blue: #2C78BF;
    --srcery-magenta: #E02C6D;
    --srcery-cyan: #0AAEB3;
    --srcery-white: #BAA67F;

    --srcery-black-bright: #918175;
    --srcery-red-bright: #F75341;
    --srcery-green-bright: #98BC37;
    --srcery-yellow-bright: #FED06E;
    --srcery-blue-bright: #68A8E4;
    --srcery-magenta-bright: #FF5C8F;
    --srcery-cyan-bright: #2BE4D0;
    --srcery-white-bright: #FCE8C3;

    --srcery-orange: #FF5F00;
    --srcery-orange-bright: #FF8700;
    --srcery-black-hard: #121212;
    --srcery-teal: #008080;
    --srcery-xgray1: #262626;
    --srcery-xgray2: #303030;
    --srcery-xgray3: #3A3A3A;
    --srcery-xgray4: #444444;
    --srcery-xgray5: #4E4E4E;
    --srcery-xgray6: #585858;
    --srcery-xgray7: #626262;
    --srcery-xgray8: #6C6C6C;
    --srcery-xgray9: #767676;
    --srcery-xgray10: #808080;
    --srcery-xgray11: #8A8A8A;
    --srcery-xgray12: #949494;

    /* Semantic colour aliases */
    --color-bg: var(--srcery-white-bright);
    --color-text: var(--srcery-black);
    --color-link: var(--srcery-blue);
    --color-link-hover: var(--srcery-blue-bright);
    --color-accent: var(--srcery-red);
    --color-muted: var(--srcery-black-bright);
    --color-border: var(--srcery-white);
    --color-code-bg: var(--srcery-black);
    --color-code-text: var(--srcery-white-bright);
    --color-inline-code-bg: var(--srcery-xgray3);

    /* Typography */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
        Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas,
        'Courier New', monospace;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --line-height: 1.75;

    /* Layout */
    --content-max-width: 860px;
    --nav-width: 160px;
    --page-padding: clamp(1rem, 4vw, 2.5rem);
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --border-radius: 4px;
}

/* ── Skip-to-content link (accessibility) ─────────────────────────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 9999;
    padding: 0.5rem 1rem;
    background: var(--srcery-blue);
    color: var(--srcery-white-bright);
    border-radius: 0 0 4px 4px;
    font-weight: bold;
    text-decoration: none;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

/* ── Visually hidden (screen-reader only) ──────────────────────────── */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Base ------------------------------------------------- */

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: var(--page-padding);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* --- Typography ------------------------------------------- */

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.25;
    margin: 1.5em 0 0.5em;
    font-weight: 700;
}

h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
}

h2 {
    font-size: clamp(1.25rem, 3vw, 1.65rem);
}

h3 {
    font-size: clamp(1.1rem, 2.5vw, 1.3rem);
}

h4 {
    font-size: 1.05rem;
}

p {
    margin: 0.75em 0;
    text-align: justify;
    hyphens: auto;
}

a {
    color: var(--color-link);
    text-decoration: underline;
    text-underline-offset: 3px;
}

a:hover,
a:focus {
    color: var(--color-link-hover);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

li {
    margin: 0.3em 0;
}

hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-xl) 0;
}

/* --- Tables ----------------------------------------------- */

table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
    overflow-x: auto;
    display: block;
    margin: var(--space-lg) 0;
    -webkit-overflow-scrolling: touch;
}

th,
td {
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--color-border);
    text-align: left;
    vertical-align: top;
}

th {
    background-color: var(--color-code-bg);
    color: var(--color-code-text);
    font-weight: 600;
    white-space: nowrap;
}

tr:nth-child(even) td {
    background-color: rgba(0, 0, 0, 0.04);
}

/* --- Blockquote ------------------------------------------- */

blockquote {
    margin: var(--space-lg) 0;
    padding: 0.75rem 1.25rem;
    border-left: 4px solid var(--color-accent);
    background-color: rgba(0, 0, 0, 0.04);
    font-style: italic;
    color: var(--srcery-xgray4);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

blockquote p {
    margin: 0;
    text-align: left;
}

/* --- Code blocks ------------------------------------------ */

pre {
    background-color: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 1rem 1.25rem;
    overflow-x: auto;
    border-radius: var(--border-radius);
    margin: var(--space-lg) 0;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    -webkit-overflow-scrolling: touch;
}

code {
    font-family: var(--font-mono);
    white-space: pre;
}

/* Inline code — not inside a pre block */
:not(pre)>code {
    background-color: var(--color-inline-code-bg);
    color: var(--srcery-white-bright);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-size: 0.875em;
    white-space: nowrap;
}

/* --- Homepage layout -------------------------------------- */

.home_page {
    min-height: 100vh;
}

.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-sm);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: var(--space-md);
    margin-bottom: var(--space-xl);
}

.header h1 {
    margin: 0;
    font-size: clamp(1.2rem, 3.5vw, 1.6rem);
    letter-spacing: -0.02em;
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: var(--space-md);
}

.nav-link {
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text);
    padding-bottom: 2px;
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.main-content {
    max-width: 72ch;
}

/* Post list on homepage */
#main ul {
    list-style: none;
    padding: 0;
}

#main li {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--color-border);
}

#main li:last-child {
    border-bottom: none;
}

/* --- Article / About — sidebar grid layout ---------------- */

.static_grid {
    display: grid;
    grid-template-columns: var(--nav-width) 1fr;
    gap: var(--space-md) var(--space-xl);
    max-width: var(--content-max-width);
    margin: 0 auto;
}

/* Sidebar nav — spans both rows */
.static_double_column1 {
    grid-column: 1;
    grid-row: 1 / 3;
}

/* Page title / article header */
.static_double_column2 {
    grid-column: 2;
    grid-row: 1;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: var(--space-md);
    align-self: end;
}

/* Main content */
.static_double_column3 {
    grid-column: 2;
    grid-row: 2;
}

/* Sidebar nav styles */
.static_double_column1 h3 {
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    position: sticky;
    top: var(--page-padding);
}

.static_double_column1 a {
    display: block;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-xs) 0;
    border-bottom: 1px solid transparent;
}

.static_double_column1 a:hover,
.static_double_column1 a:focus {
    color: var(--color-accent);
}

.reset_a a {
    color: inherit;
    text-decoration: none;
}

.reset_a a:hover {
    color: var(--color-accent);
}

/* Article title */
.static_double_column2 h2 {
    margin: 0 0 var(--space-sm);
    font-size: clamp(1.3rem, 3.5vw, 1.8rem);
    letter-spacing: -0.02em;
}

/* Article metadata — author / date */
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--color-muted);
}

/* Article body */
.content-border {
    padding-top: var(--space-lg);
}

/* --- About page — avatar ---------------------------------- */

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-accent);
    margin-bottom: var(--space-lg);
}

/* --- Legacy helpers (kept for compatibility) -------------- */

.upper-header {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

.navbar {
    display: flex;
    flex-direction: row;
}

.navlink {
    margin: var(--space-xs);
}

.logo {
    max-height: 30px;
}

/* --- Responsive breakpoints ------------------------------- */

/* Collapse sidebar to top bar on medium screens */
@media (max-width: 640px) {
    .static_grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr;
        gap: var(--space-md);
    }

    .static_double_column1 {
        grid-column: 1;
        grid-row: 1;
    }

    .static_double_column1 h3 {
        flex-direction: row;
        gap: var(--space-lg);
        position: static;
    }

    .static_double_column2 {
        grid-column: 1;
        grid-row: 2;
    }

    .static_double_column3 {
        grid-column: 1;
        grid-row: 3;
    }
}

/* Small phones */
@media (max-width: 420px) {
    :root {
        --page-padding: 0.75rem;
        --nav-width: 100%;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    pre {
        font-size: 0.78rem;
        padding: 0.75rem;
        border-radius: 0;
        margin-left: calc(-1 * var(--page-padding));
        margin-right: calc(-1 * var(--page-padding));
    }

    table {
        font-size: 0.78rem;
    }

    :not(pre)>code {
        white-space: pre-wrap;
        word-break: break-all;
    }
}

/* ============================================================
   Syntax highlighting — Srcery palette
   Token classes emitted by Zine's code renderer
   ============================================================ */

code .attribute {
    color: var(--srcery-white-bright)
}

code .boolean {
    color: var(--srcery-magenta-bright)
}

code .character {
    color: var(--srcery-magenta-bright)
}

code .character-special {
    color: var(--srcery-blue)
}

code .comment {
    color: var(--srcery-black-bright)
}

code .conditional {
    color: var(--srcery-red)
}

code .constant {
    color: var(--srcery-magenta-bright)
}

code .constant-builtin {
    color: var(--srcery-orange)
}

code .constant-macro {
    color: var(--srcery-cyan)
}

code .constructor {
    color: var(--srcery-blue)
}

code .debug {
    color: var(--srcery-black-bright)
}

code .define {
    color: var(--srcery-cyan)
}

code .error {
    color: var(--srcery-white)
}

code .exception {
    color: var(--srcery-red)
}

code .field {
    color: var(--srcery-cyan)
}

code .float {
    color: var(--srcery-magenta-bright)
}

code .function {
    color: var(--srcery-yellow)
}

code .function-builtin {
    color: var(--srcery-orange)
}

code .function-call {
    color: var(--srcery-yellow)
}

code .function-macro {
    color: var(--srcery-orange)
}

code .include {
    color: var(--srcery-cyan)
}

code .keyword {
    color: var(--srcery-red)
}

code .keyword-function {
    color: var(--srcery-red)
}

code .keyword-return {
    color: var(--srcery-red)
}

code .keyword-operator {
    color: var(--srcery-red)
}

code .label {
    color: var(--srcery-red)
}

code .literal {
    color: var(--srcery-red)
}

code .macro {
    color: var(--srcery-orange)
}

code .method {
    color: var(--srcery-yellow)
}

code .namespace {
    color: var(--srcery-cyan)
}

code .number {
    color: var(--srcery-magenta-bright)
}

code .operator {
    color: var(--srcery-white-bright)
}

code .parameter {
    color: var(--srcery-cyan)
}

code .preproc {
    color: var(--srcery-cyan)
}

code .property {
    color: var(--srcery-cyan)
}

code .punctuation {
    color: var(--srcery-black-bright)
}

code .punctuation-bracket {
    color: var(--srcery-black-bright)
}

code .punctuation-delimiter {
    color: var(--srcery-black-bright)
}

code .punctuation-special {
    color: var(--srcery-black-bright)
}

code .repeat {
    color: var(--srcery-red)
}

code .storageclass {
    color: var(--srcery-orange)
}

code .string {
    color: var(--srcery-green-bright)
}

code .string-escape {
    color: var(--srcery-blue)
}

code .string-special {
    color: var(--srcery-blue)
}

code .structure {
    color: var(--srcery-cyan)
}

code .tag {
    color: var(--srcery-cyan)
}

code .text-literal {
    color: var(--srcery-black-bright)
}

code .text-reference {
    color: var(--srcery-cyan)
}

code .text-title {
    color: var(--srcery-green)
}

code .text-todo {
    color: var(--srcery-white)
}

/* bold */
code .text-underline {
    color: var(--srcery-blue)
}

/* bold */
code .text-uri {
    color: var(--srcery-blue)
}

/* underline */
code .type {
    color: var(--srcery-blue-bright)
}

code .type-builtin {
    color: var(--srcery-blue-bright)
}

code .type-definition {
    color: var(--srcery-magenta)
}

code .type-qualifier {
    color: var(--srcery-blue-bright)
}

code .variable {
    color: var(--srcery-cyan)
}

code .variable-builtin {
    color: var(--srcery-magenta-bright)
}

/* ── Focus visibility (WCAG 2.1 §1.4.11) ──────────────────────────── */
:focus-visible {
    outline: 3px solid var(--color-link);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Visited link colour */
a:visited {
    color: var(--srcery-magenta);
}

/* ── RSS nav link ───────────────────────────────────────────────────── */
.nav-rss {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--srcery-orange) !important;
}

/* ── Side navigation (article / about columns) ─────────────────────── */
.side-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.side-nav a {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    padding: 0.2rem 0.3rem;
    border-radius: var(--border-radius);
    transition: background 0.15s;
}

.side-nav a:hover {
    background: var(--srcery-xgray3);
    color: var(--srcery-white-bright);
}

/* ── Comments section ───────────────────────────────────────────────── */
.comments-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.comments-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.comments-section noscript p {
    color: var(--color-muted);
    font-style: italic;
}

/* ── Article tags ───────────────────────────────────────────────────── */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-sm);
}

.tag {
    display: inline-block;
    padding: 0.15em 0.55em;
    border-radius: var(--border-radius);
    font-size: 0.78rem;
    font-weight: 600;
    background: var(--srcery-xgray3);
    color: var(--srcery-white-bright);
    letter-spacing: 0.03em;
    text-transform: lowercase;
}

/* Language tags — BCP 47 locale codes get distinct colours */
.tag[data-tag="pt-BR"] {
    background: var(--srcery-green);
    color: var(--srcery-black);
}

.tag[data-tag="en-US"] {
    background: var(--srcery-blue);
    color: var(--srcery-white-bright);
}

/* ── Site footer ────────────────────────────────────────────────────── */
.site-footer {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    color: var(--color-muted);
    text-align: center;
}

.site-footer a {
    color: var(--color-muted);
}

.footer-tech {
    margin-top: var(--space-xs);
    font-size: 0.8rem;
}