/* ============================================================================
   COOLCATSOF.DEV / KNOWLEDGE BASE — shared stylesheet
   Cyberpunk aesthetic, single-file philosophy, mobile-first.
   ============================================================================ */

:root {
    --neon-pink: #ff00ff;
    --neon-cyan: #00ffff;
    --neon-purple: #bc13fe;
    --neon-yellow: #f1ff00;
    --bg-dark: #020202;
    --bg-card: rgba(255, 255, 255, 0.02);
    --border-soft: rgba(0, 255, 255, 0.1);
    --text-dim: #888;
    --text-mid: #ccc;
    --text-bright: #f0f0f0;
    --matrix-light: #00ff41;
    --font-main: 'JetBrains Mono', 'Courier New', monospace;
}

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

html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-dark);
    color: var(--text-mid);
    font-family: var(--font-main);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* CRT scanline overlay (subtle, desktop only) */
body.crt::before {
    content: " ";
    display: block;
    position: fixed;
    inset: 0;
    background: linear-gradient(rgba(18,16,16,0) 50%, rgba(0,0,0,0.18) 50%),
                linear-gradient(90deg, rgba(255,0,0,0.04), rgba(0,255,0,0.015), rgba(0,0,255,0.04));
    background-size: 100% 2px, 3px 100%;
    z-index: 1000;
    pointer-events: none;
}

/* Matrix bg, very subtle */
.matrix-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    opacity: 0.08;
    overflow: hidden;
}

.matrix-column {
    position: absolute;
    top: -100px;
    font-size: 12px;
    color: var(--matrix-light);
    text-shadow: 0 0 4px var(--matrix-light);
    writing-mode: vertical-rl;
    text-orientation: upright;
    animation: fall linear infinite;
}

@keyframes fall { to { transform: translateY(110vh); } }

/* ============================================================================
   HEADER & NAV
   ============================================================================ */
.kb-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: rgba(2, 2, 2, 0.92);
    border-bottom: 1px solid var(--border-soft);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    gap: 16px;
}

.back-link {
    color: var(--neon-cyan);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 1px;
    font-size: 0.85rem;
    transition: 0.2s;
}

.back-link:hover { color: var(--neon-pink); text-shadow: 0 0 8px var(--neon-pink); }

.kb-nav {
    display: flex;
    gap: 24px;
}

.kb-nav-link {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.75rem;
    letter-spacing: 2px;
    transition: 0.2s;
}

.kb-nav-link:hover { color: var(--neon-cyan); }

/* ============================================================================
   HERO
   ============================================================================ */
.kb-hero {
    text-align: center;
    padding: 80px 24px 60px;
    max-width: 880px;
    margin: 0 auto;
}

.kb-title {
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 700;
    color: var(--neon-cyan);
    text-transform: uppercase;
    margin-bottom: 24px;
    text-shadow:
        0.04em 0 0 rgba(255, 0, 255, 0.7),
        -0.04em 0 0 rgba(0, 255, 255, 0.7);
    letter-spacing: 0.05em;
}

.glitch { animation: glitch 4s infinite; }

@keyframes glitch {
    0%, 92%, 100% { text-shadow: 0.04em 0 0 rgba(255,0,255,0.7), -0.04em 0 0 rgba(0,255,255,0.7); }
    93% { text-shadow: 0.06em 0.02em 0 rgba(255,0,255,0.9), -0.06em -0.02em 0 rgba(0,255,255,0.9); }
    95% { text-shadow: -0.04em 0.02em 0 rgba(255,0,255,0.7), 0.04em -0.02em 0 rgba(0,255,255,0.7); }
}

.kb-tagline {
    font-size: 1.15rem;
    color: var(--neon-purple);
    margin-bottom: 12px;
    text-shadow: 0 0 8px rgba(188, 19, 254, 0.5);
}

.kb-subtagline {
    font-size: 0.95rem;
    color: var(--text-dim);
    max-width: 640px;
    margin: 0 auto;
}

/* ============================================================================
   HUB SECTIONS & GRID
   ============================================================================ */
.kb-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
    scroll-margin-top: 80px;
}

.kb-section-title {
    font-size: 1.5rem;
    color: var(--neon-cyan);
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: 36px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-soft);
}

.kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.kb-card {
    position: relative;
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border-soft);
    padding: 28px 24px 28px;
    transition: all 0.3s;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    height: 100%;
}

.kb-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--neon-pink), var(--neon-cyan));
    transition: 0.4s;
}

.kb-card:hover {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 24px rgba(0, 255, 255, 0.12);
    transform: translateY(-4px);
}

.kb-card:hover::before { left: 0; }
.kb-card:hover h3 { text-shadow: 0 0 8px var(--neon-cyan); }

.kb-card-num {
    display: block;
    color: var(--neon-pink);
    font-size: 0.75rem;
    letter-spacing: 2px;
    margin-bottom: 12px;
    opacity: 0.7;
}

.kb-card h3 {
    color: var(--neon-cyan);
    font-size: 1.05rem;
    margin-bottom: 12px;
    line-height: 1.4;
    transition: 0.2s;
}

.kb-card p {
    color: var(--text-mid);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.kb-card-tag {
    display: inline-block;
    color: var(--neon-purple);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 3px 8px;
    border: 1px solid rgba(188, 19, 254, 0.4);
    border-radius: 2px;
}

/* ============================================================================
   ARTICLE LAYOUT (single article pages)
   ============================================================================ */
.article {
    max-width: 760px;
    margin: 0 auto;
    padding: 60px 24px 80px;
}

.breadcrumb {
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-bottom: 32px;
    letter-spacing: 1px;
}

.breadcrumb a {
    color: var(--neon-cyan);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-shadow: 0 0 6px var(--neon-cyan);
}

.breadcrumb-sep {
    margin: 0 8px;
    color: var(--neon-pink);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-bottom: 28px;
    letter-spacing: 0.5px;
}

.article-meta time {
    color: var(--neon-cyan);
}

.article-meta .reading-time::before { content: "// "; color: var(--neon-pink); }
.article-meta .author::before { content: "// "; color: var(--neon-pink); }

.article h1 {
    font-size: clamp(1.6rem, 4.5vw, 2.6rem);
    color: var(--text-bright);
    line-height: 1.2;
    margin-bottom: 24px;
    font-weight: 700;
}

.article-intro {
    font-size: 1.05rem;
    color: var(--text-mid);
    line-height: 1.75;
    margin-bottom: 40px;
    padding-left: 16px;
    border-left: 3px solid var(--neon-pink);
}

.article h2 {
    font-size: 1.5rem;
    color: var(--neon-cyan);
    margin-top: 56px;
    margin-bottom: 18px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-soft);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.article h2::before {
    content: "// ";
    color: var(--neon-pink);
}

.article h3 {
    font-size: 1.15rem;
    color: var(--neon-purple);
    margin-top: 32px;
    margin-bottom: 12px;
}

.article p {
    margin-bottom: 18px;
    color: var(--text-mid);
}

.article p strong {
    color: var(--text-bright);
    font-weight: 700;
}

.article a {
    color: var(--neon-cyan);
    text-decoration: none;
    border-bottom: 1px dashed rgba(0, 255, 255, 0.4);
    transition: 0.2s;
}

.article a:hover {
    color: var(--neon-pink);
    border-bottom-color: var(--neon-pink);
    text-shadow: 0 0 6px var(--neon-pink);
}

.article ul,
.article ol {
    margin-left: 24px;
    margin-bottom: 24px;
    color: var(--text-mid);
}

.article li {
    margin-bottom: 10px;
}

.article ul li::marker {
    color: var(--neon-pink);
}

.article ol li::marker {
    color: var(--neon-cyan);
    font-weight: 700;
}

.article blockquote {
    border-left: 3px solid var(--neon-purple);
    padding: 16px 24px;
    margin: 32px 0;
    background: rgba(188, 19, 254, 0.05);
    color: var(--text-bright);
    font-style: italic;
}

.article blockquote cite {
    display: block;
    margin-top: 8px;
    color: var(--text-dim);
    font-size: 0.85rem;
    font-style: normal;
}

.article blockquote cite::before {
    content: "— ";
}

.article code {
    background: rgba(0, 255, 255, 0.08);
    color: var(--neon-cyan);
    padding: 2px 6px;
    border-radius: 2px;
    font-size: 0.9em;
}

.article pre {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-soft);
    padding: 16px;
    overflow-x: auto;
    margin: 24px 0;
}

.article pre code {
    background: none;
    color: var(--matrix-light);
    padding: 0;
}

/* Stat callout */
.stat-callout {
    border: 1px solid var(--neon-pink);
    background: rgba(255, 0, 255, 0.04);
    padding: 20px 24px;
    margin: 32px 0;
    text-align: center;
}

.stat-callout strong {
    display: block;
    font-size: 2rem;
    color: var(--neon-pink);
    text-shadow: 0 0 12px rgba(255, 0, 255, 0.5);
    margin-bottom: 4px;
}

.stat-callout span {
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* TL;DR box */
.tldr {
    border: 1px solid var(--neon-cyan);
    background: rgba(0, 255, 255, 0.04);
    padding: 20px 24px;
    margin: 0 0 40px;
}

.tldr-label {
    display: inline-block;
    background: var(--neon-cyan);
    color: var(--bg-dark);
    padding: 2px 8px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.tldr p {
    color: var(--text-bright);
    margin: 0;
}

/* TOC */
.toc {
    background: var(--bg-card);
    border: 1px solid var(--border-soft);
    padding: 20px 24px;
    margin-bottom: 40px;
}

.toc-label {
    color: var(--neon-pink);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.toc ol {
    margin: 0 0 0 24px;
    padding: 0;
    color: var(--text-mid);
}

.toc li {
    margin-bottom: 6px;
}

.toc a {
    color: var(--neon-cyan);
    text-decoration: none;
    border: none;
}

.toc a:hover {
    color: var(--neon-pink);
}

/* FAQ */
.faq {
    margin-top: 56px;
    padding-top: 40px;
    border-top: 1px solid var(--border-soft);
}

.faq-item {
    border-bottom: 1px solid var(--border-soft);
    padding: 20px 0;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 700;
    color: var(--neon-cyan);
    list-style: none;
    padding-right: 28px;
    position: relative;
    transition: 0.2s;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: "+";
    position: absolute;
    right: 0;
    top: 0;
    color: var(--neon-pink);
    font-size: 1.4rem;
    line-height: 1;
}

.faq-item[open] summary::after { content: "−"; }

.faq-item summary:hover {
    text-shadow: 0 0 6px var(--neon-cyan);
}

.faq-item p {
    margin-top: 14px;
    margin-bottom: 0;
    color: var(--text-mid);
}

/* Related articles */
.related {
    margin-top: 56px;
    padding-top: 40px;
    border-top: 1px solid var(--border-soft);
}

.related-label {
    color: var(--neon-pink);
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.related-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.related-list li {
    margin-bottom: 10px;
}

.related-list a {
    color: var(--neon-cyan);
    text-decoration: none;
    border: none;
    font-size: 0.95rem;
}

.related-list a::before {
    content: "→ ";
    color: var(--neon-pink);
}

.related-list a:hover {
    text-shadow: 0 0 6px var(--neon-cyan);
}

/* CTA */
.article-cta {
    margin-top: 56px;
    padding: 32px 24px;
    border: 1px solid var(--neon-pink);
    background: rgba(255, 0, 255, 0.03);
    text-align: center;
}

.article-cta p {
    margin-bottom: 16px;
    color: var(--text-bright);
}

.article-cta a {
    display: inline-block;
    padding: 12px 28px;
    border: 2px solid var(--neon-pink);
    color: var(--neon-pink);
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    transition: 0.2s;
}

.article-cta a:hover {
    background: rgba(255, 0, 255, 0.15);
    color: white;
    box-shadow: 0 0 16px var(--neon-pink);
}

/* ============================================================================
   FOOTER
   ============================================================================ */
.kb-footer {
    text-align: center;
    padding: 60px 24px 40px;
    border-top: 1px solid var(--border-soft);
    margin-top: 80px;
    color: var(--text-dim);
    font-size: 0.78rem;
    letter-spacing: 1px;
}

.kb-footer p {
    margin-bottom: 8px;
}

.kb-footer a {
    color: var(--neon-cyan);
    text-decoration: none;
}

.kb-footer a:hover {
    color: var(--neon-pink);
}

/* ============================================================================
   LANGUAGE SWITCHER — integrated into .kb-header, right-aligned after nav
   Visually: one unified bar  [ ← HOME | NAV LINKS | PL EN ]
   ============================================================================ */
.kb-lang-switcher {
    display: flex;
    gap: 10px;
    align-items: center;
    padding-left: 16px;
    margin-left: auto;
    border-left: 1px solid var(--border-soft);
}

/* Button-element reset + exact homepage .lang-btn style */
.kb-lang-btn {
    /* reset browser <button> defaults so it renders like the homepage <div> */
    appearance: none;
    -webkit-appearance: none;
    border: 0;
    background: transparent;
    padding: 0;
    margin: 0;
    font-family: inherit;
    font-weight: normal;
    letter-spacing: 0;
    /* 1.6 to match homepage body line-height exactly, regardless of knowledge
       base body which is 1.7 for article reading comfort */
    line-height: 1.6;
    /* homepage .lang-btn */
    cursor: pointer;
    font-size: 0.7rem;
    color: var(--neon-cyan);
    text-transform: uppercase;
    transition: 0.3s;
    opacity: 0.5;
}

.kb-lang-btn:hover,
.kb-lang-btn.active {
    opacity: 1;
    text-shadow: 0 0 5px var(--neon-cyan);
}

/* General rule: the knowledge base language switcher shows ONLY the languages
   that actually have a verified, expert-grade translation for the current slug.
   Untranslated languages are HIDDEN entirely (not dimmed, not line-through).
   New languages appear automatically once their slug is added to the
   TRANSLATIONS map in kb-lang.js — no HTML changes needed. */
.kb-lang-btn.not-translated {
    display: none;
}

/* Language banner — bold, unmissable, appears below header for "not translated" warnings */
.kb-lang-banner {
    position: relative;
    z-index: 150;
    background: rgba(255, 0, 255, 0.12);
    border-bottom: 2px solid var(--neon-pink);
    color: var(--text-bright);
    padding: 16px 60px 16px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    animation: banner-flash 0.6s ease-out;
}

@keyframes banner-flash {
    0% { background: rgba(255, 0, 255, 0.35); }
    100% { background: rgba(255, 0, 255, 0.12); }
}

.kb-lang-banner span {
    color: var(--text-bright);
}

.kb-lang-banner a {
    color: var(--neon-cyan);
    text-decoration: underline;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
}

.kb-lang-banner a:hover {
    color: var(--neon-pink);
    text-shadow: 0 0 6px var(--neon-pink);
}

.kb-lang-banner-close {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: 0;
    color: var(--text-dim);
    font-size: 1.4rem;
    cursor: pointer;
    line-height: 1;
    padding: 4px 10px;
    font-family: var(--font-main);
}

.kb-lang-banner-close:hover {
    color: var(--neon-pink);
}

@media (max-width: 768px) {
    /* homepage mobile .lang-switcher rules (top/right 10, gap 6, pad 4 8, wrap 200) */
    .kb-lang-switcher {
        top: 10px;
        right: 10px;
        gap: 6px;
        padding: 4px 8px;
        flex-wrap: wrap;
        max-width: 200px;
    }
    .kb-lang-btn {
        font-size: 0.6rem;
    }
    .kb-lang-banner { padding: 10px 48px 10px 16px; font-size: 0.78rem; gap: 10px; flex-wrap: wrap; }
    .kb-lang-banner a { font-size: 0.72rem; }
}

@media (max-width: 480px) {
    /* homepage 480 rule */
    .kb-lang-switcher {
        max-width: 160px;
    }
}

/* ============================================================================
   TAP TARGET FIXES (WCAG AA 24px minimum; cards become full-area links)
   ============================================================================ */

/* Header back-link — expand hit area without changing visual layout */
.back-link {
    display: inline-block;
    padding: 12px 8px;
    margin: -12px -8px;
}

/* Header nav links — same trick */
.kb-nav-link {
    display: inline-block;
    padding: 14px 6px;
    margin: -14px -6px;
}

/* Footer links — bump for AAA */
.kb-footer a {
    display: inline-block;
    padding: 13px 8px;
}

/* Breadcrumb links — full AAA tap area (44×44) */
.breadcrumb a {
    display: inline-block;
    padding: 11px 8px;
    margin: -11px -8px;
}

/* Related list items */
.related-list a {
    display: inline-block;
    padding: 8px 0;
}

/* TOC links */
.toc a {
    display: inline-block;
    padding: 4px 0;
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 768px) {
    body.crt::before { display: none; }
    .matrix-bg { display: none; }

    .kb-header { padding: 12px 16px; }
    .kb-nav { gap: 16px; }
    .kb-nav-link { font-size: 0.7rem; letter-spacing: 1px; }

    .kb-hero { padding: 50px 16px 40px; }
    .kb-section { padding: 40px 16px; }
    .kb-section-title { font-size: 1.2rem; letter-spacing: 2px; }
    .kb-grid { grid-template-columns: 1fr; gap: 16px; }
    .kb-card { padding: 22px 18px; }

    .article { padding: 40px 16px 60px; }
    .article-intro { font-size: 0.98rem; padding-left: 12px; }
    .article h2 { font-size: 1.25rem; margin-top: 40px; }
    .article h3 { font-size: 1.05rem; margin-top: 24px; }

    .stat-callout strong { font-size: 1.6rem; }
    .toc { padding: 16px 20px; }
}

@media (max-width: 480px) {
    .kb-title { font-size: 1.8rem; }
    .kb-tagline { font-size: 1rem; }
    .kb-subtagline { font-size: 0.85rem; }
    .article h1 { font-size: 1.5rem; }
    .article-intro { font-size: 0.92rem; }
}

/* Reduced motion respect */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}