@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --kb-bg: #080b10;
  --kb-surface: #10151c;
  --kb-surface-2: #151c25;
  --kb-border: rgba(255,255,255,.10);
  --kb-text: #f4f7fb;
  --kb-muted: #9ca9b8;
  --kb-faint: #718092;
  --kb-accent: #4a9eff;
  --kb-accent-2: #31bdc2;
  /* SmartMod Labs brand accents from style.css: --c-inner / --c-outer. */
  --kb-brand: #4a9eff;
  --kb-brand-soft: #2dd4bf;
  /* Existing SmartMod Labs hover blue from style.css, softened for headings. */
  --kb-heading: #6fb3ff;
  --kb-warning: #ffd58a;
  --kb-max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--kb-bg); color: var(--kb-text); font-family: Inter, system-ui, sans-serif; line-height: 1.7; }
a { color: var(--kb-accent); text-decoration: none; }
a:hover { color: #8bc4ff; }
img { max-width: 100%; }
.kb-shell { width: min(100% - 2rem, var(--kb-max)); margin-inline: auto; }
.kb-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--kb-border); background: rgba(8,11,16,.90); backdrop-filter: blur(16px); }
.kb-header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.kb-brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--kb-text); font-weight: 700; letter-spacing: -.02em; }
.kb-brand img { width: 34px; height: 34px; object-fit: contain; }
.kb-brand span { font-size: .9rem; }
.kb-nav { display: flex; align-items: center; gap: 1rem; font-size: .78rem; }
.kb-nav a { color: var(--kb-muted); }
.kb-nav a:hover { color: var(--kb-text); }
.kb-breadcrumb { padding: 1.35rem 0 0; font-size: .72rem; color: var(--kb-faint); }
.kb-breadcrumb ol { display: flex; flex-wrap: wrap; gap: .45rem; margin: 0; padding: 0; list-style: none; }
.kb-breadcrumb a { color: var(--kb-muted); }
.kb-breadcrumb [aria-current='page'] { color: var(--kb-accent-2); }
.kb-hero { padding: 2.35rem 0 1.9rem; border-bottom: 1px solid var(--kb-border); }
.kb-kicker { margin: 0 0 .8rem; color: var(--kb-accent-2); font-size: .72rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.kb-hero h1 { max-width: 980px; margin: 0; font-size: clamp(2.375rem, 2.4vw, 3.25rem); line-height: 1.08; letter-spacing: -.045em; }
.kb-kicker-accent { color: var(--kb-brand); }
.kb-hero p { max-width: 760px; margin: 1rem 0 0; color: var(--kb-muted); font-size: clamp(.96rem, 1vw, 1.05rem); }
.kb-meta-row { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.15rem; }
.kb-meta { border: 1px solid var(--kb-border); border-radius: 999px; padding: .38rem .7rem; color: var(--kb-muted); font-size: .7rem; }
.kb-meta strong { color: var(--kb-text); }
.kb-main { padding: 2.65rem 0 4.5rem; }
.kb-index-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 1.3rem; align-items: start; }
.kb-card { display: block; padding: 1.35rem; border: 1px solid var(--kb-border); border-radius: 18px; background: linear-gradient(145deg, var(--kb-surface), #0c1117); color: var(--kb-text); transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.kb-card:hover { transform: translateY(-3px); border-color: rgba(74,158,255,.55); background: var(--kb-surface-2); }
.kb-card-tag { color: var(--kb-accent-2); font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.kb-card h2 { margin: .65rem 0 .5rem; font-size: 1.2rem; line-height: 1.25; }
.kb-card p { margin: 0; color: var(--kb-muted); font-size: .86rem; }
.kb-card-arrow { display: inline-block; margin-top: 1.2rem; color: var(--kb-accent); font-size: .8rem; font-weight: 600; }
.kb-section-title { margin: 0 0 1.1rem; font-size: 1.45rem; letter-spacing: -.03em; }
.kb-category { margin-top: 2rem; }
.kb-category:first-child { margin-top: 0; }
.kb-article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 2.7rem; align-items: start; }
.kb-article { min-width: 0; }
.kb-answer { margin: 0 0 1.9rem; padding: 1rem 1.15rem; border-left: 3px solid var(--kb-accent); border-radius: 0 14px 14px 0; background: rgba(74,158,255,.08); }
.kb-answer strong { color: var(--kb-text); }
.kb-related { margin: -.7rem 0 1.7rem; padding: .8rem .95rem; border: 1px solid rgba(49,189,194,.25); border-radius: 12px; background: rgba(49,189,194,.06); color: var(--kb-muted); font-size: .84rem; }
.kb-related strong { color: var(--kb-text); }
.kb-article h2 { position: relative; margin: 2.65rem 0 .85rem; padding-left: .78rem; font-size: clamp(1.6875rem, 1.7vw, 1.875rem); line-height: 1.18; letter-spacing: -.025em; }
.kb-article h2 { color: var(--kb-heading); }
.kb-article h2::before { content: ''; position: absolute; left: 0; top: .12em; bottom: .12em; width: 3px; border-radius: 3px; background: var(--kb-brand); }
.kb-article h3 { margin: 1.6rem 0 .55rem; padding-left: .55rem; border-left: 2px solid rgba(45,212,191,.48); font-size: clamp(1.25rem, 1.3vw, 1.4375rem); line-height: 1.3; }
.kb-article p { max-width: none; color: #c3ceda; }
.kb-article ul, .kb-article ol { max-width: none; padding-left: 1.3rem; color: #c3ceda; }
.kb-article > section p, .kb-article > section li { text-align: justify; hyphens: auto; -webkit-hyphens: auto; overflow-wrap: break-word; }
.kb-article li + li { margin-top: .35rem; }
.kb-requirements { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; margin: 1.15rem 0 1.7rem; }
.kb-requirement { padding: .85rem; border: 1px solid var(--kb-border); border-radius: 14px; background: var(--kb-surface); }
.kb-requirement strong { display: block; margin-bottom: .25rem; color: var(--kb-text); font-size: .82rem; }
.kb-requirement span { color: var(--kb-muted); font-size: .78rem; }
.kb-step { margin: 2.35rem 0 0; padding-top: 1.65rem; border-top: 1px solid var(--kb-border); }
.kb-step:first-of-type { border-top: 0; padding-top: 0; }
.kb-step-number { color: var(--kb-accent-2); font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.kb-step h2 { margin-top: .35rem; }
.kb-gallery { margin: 1.1rem 0 0; }
.kb-gallery-single { width: clamp(260px, 30%, 360px); }
.kb-gallery-multi { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: .75rem; width: min(100%, 720px); }
.kb-figure { min-width: 0; margin: 0; }
.kb-image-button { display: block; position: relative; width: 100%; padding: 0; border: 1px solid var(--kb-border); border-radius: 14px; overflow: hidden; background: #0d1014; cursor: zoom-in; box-shadow: 0 20px 50px rgba(0,0,0,.28); }
.kb-image-button img { display: block; width: auto; max-width: 100%; height: auto; margin-inline: auto; }
.kb-zoom-label { position: absolute; right: .8rem; bottom: .8rem; padding: .35rem .65rem; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; background: rgba(0,0,0,.7); color: #e8eef5; font-size: .7rem; opacity: .7; }
.kb-image-button:hover .kb-zoom-label, .kb-image-button:focus-visible .kb-zoom-label { opacity: 1; }
.kb-figure figcaption { margin-top: .7rem; color: var(--kb-faint); font-size: .76rem; }
.kb-safety { margin-top: 2rem; padding: 1rem 1.1rem; border: 1px solid rgba(255,213,138,.35); border-radius: 14px; background: rgba(255,213,138,.06); }
.kb-safety strong { color: var(--kb-warning); }
.kb-note { margin: 1.25rem 0; padding: .95rem 1.1rem; border-left: 3px solid var(--kb-brand); border-radius: 0 12px 12px 0; background: rgba(74,158,255,.07); }
.kb-note strong { color: var(--kb-text); }
.kb-note p { margin: .45rem 0 0; }
.kb-zone-diagram { display: grid; gap: .65rem; justify-items: center; margin: 1.4rem 0; padding: 1rem; border: 1px solid var(--kb-border); border-radius: 14px; background: rgba(255,255,255,.025); }
.kb-zone-inputs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .55rem; width: 100%; }
.kb-zone-node, .kb-zone-core, .kb-zone-output { display: grid; gap: .15rem; padding: .65rem .75rem; border: 1px solid rgba(74,158,255,.28); border-radius: 10px; color: var(--kb-text); text-align: center; }
.kb-zone-node small { color: var(--kb-muted); font-size: .8rem; }
.kb-zone-core { border-color: rgba(49,189,194,.45); background: rgba(49,189,194,.08); }
.kb-zone-output { width: min(100%, 30rem); }
.kb-zone-arrow { color: var(--kb-brand); font-size: 1.25rem; line-height: 1; }
.kb-faq { border-top: 1px solid var(--kb-border); }
.kb-faq details { padding: 1rem 0; border-bottom: 1px solid var(--kb-border); }
.kb-faq summary { cursor: pointer; color: var(--kb-text); font-weight: 600; }
.kb-faq details p { margin: .8rem 0 0; }
.kb-aside { position: sticky; top: 90px; }
.kb-toc { padding: 1rem; border: 1px solid var(--kb-border); border-radius: 14px; background: var(--kb-surface); }
.kb-toc strong { display: block; margin-bottom: .65rem; font-size: .78rem; }
.kb-toc a { display: block; padding: .25rem 0; color: var(--kb-muted); font-size: .76rem; line-height: 1.45; }
.kb-toc a:hover { color: var(--kb-text); }
.kb-cta { margin-top: 3rem; padding: 1.25rem; border: 1px solid rgba(49,189,194,.25); border-radius: 18px; background: linear-gradient(135deg, rgba(49,189,194,.10), rgba(74,158,255,.06)); }
.kb-cta h2 { margin-top: 0; font-size: 1.3rem; }
.kb-cta p { margin-bottom: 1.1rem; }
.kb-button { display: inline-flex; align-items: center; gap: .4rem; padding: .7rem 1rem; border-radius: 999px; background: var(--kb-accent); color: #06101d; font-size: .8rem; font-weight: 700; }
.kb-button:hover { color: #06101d; background: #8bc4ff; }
.kb-footer { padding: 1.5rem 0 2rem; border-top: 1px solid var(--kb-border); color: var(--kb-faint); font-size: .72rem; }
.kb-lightbox { display: flex; position: fixed; inset: 0; z-index: 100; align-items: center; justify-content: center; padding: 1rem; background: rgba(0,0,0,.92); opacity: 0; pointer-events: none; transition: opacity .2s ease; }
.kb-lightbox.is-open { opacity: 1; pointer-events: auto; }
.kb-lightbox img { max-width: 96vw; max-height: 92vh; width: auto; height: auto; object-fit: contain; box-shadow: 0 20px 90px rgba(0,0,0,.8); }
.kb-lightbox-close { position: absolute; top: 1rem; right: 1rem; width: 42px; height: 42px; border: 1px solid rgba(255,255,255,.3); border-radius: 50%; background: rgba(255,255,255,.08); color: #fff; font-size: 1.5rem; cursor: pointer; }
@media (max-width: 820px) { .kb-index-grid, .kb-article-layout { grid-template-columns: 1fr; gap: 1.5rem; } .kb-aside { position: static; order: 2; } .kb-toc { display: flex; flex-wrap: wrap; gap: .2rem 1rem; } .kb-toc strong { width: 100%; } .kb-toc a { padding: .15rem 0; } }
@media (min-width: 561px) and (max-width: 1100px) { .kb-gallery-single { width: clamp(300px, 48%, 480px); } }
@media (max-width: 560px) { .kb-shell { width: min(100% - 1.2rem, var(--kb-max)); } .kb-header-inner { min-height: 64px; } .kb-brand span { font-size: .8rem; } .kb-nav { gap: .6rem; font-size: .7rem; } .kb-hero { padding: 1.8rem 0 1.5rem; } .kb-hero h1 { font-size: clamp(2rem, 8.5vw, 2.25rem); } .kb-main { padding-top: 1.7rem; } .kb-requirements { grid-template-columns: 1fr; } .kb-article h2 { margin-top: 2rem; } .kb-article > section p, .kb-article > section li { text-align: left; } .kb-gallery-single, .kb-gallery-multi { width: 100%; } .kb-gallery-multi { grid-template-columns: 1fr; } .kb-image-button { border-radius: 10px; } .kb-zoom-label { opacity: 1; } }
@media (max-width: 560px) { .kb-zone-inputs { grid-template-columns: 1fr; } .kb-zone-inputs .kb-zone-node { width: 100%; } }