/*
Theme Name: Skill4 Library
Theme URI: https://skill4.ru/
Author: Skill4
Description: Светлая русская библиотека промптов, навыков и рабочих задач.
Version: 3.0.0
Text Domain: skill4-library
*/

:root {
  color-scheme: light;
  --s4-bg: #f0eee6;
  --s4-surface: #fbfaf6;
  --s4-surface-muted: #e5e2d9;
  --s4-ink: #0c0c0b;
  --s4-muted: #62625f;
  --s4-faint: #77766f;
  --s4-line: #dcd7c8;
  --s4-line-strong: #d6d1c5;
  --s4-accent: #8a503a;
  --s4-accent-soft: #ead8cc;
  --s4-warm: #756e63;
  --s4-card: #ebe8df;
  --s4-card-light: #f4f2ec;
  --s4-container: 1152px;
  --s4-radius: 12px;
  --s4-radius-small: 8px;
  --s4-ease: cubic-bezier(.22, .8, .24, 1);
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--s4-bg);
  color: var(--s4-ink);
  font-family: "Avenir Next", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
body, button, input, textarea, select { font-family: inherit; }
img, svg { max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font-size: inherit; }
button { border: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
button, .skill4-button, .skill4-filter-chip { cursor: pointer; }
:focus-visible { outline: 3px solid #b56c42; outline-offset: 3px; }

.skill4-container { width: min(100%, var(--s4-container)); margin-inline: auto; padding-inline: 32px; }
.skill4-narrow { max-width: 980px; }
.skill4-page-shell { min-height: calc(100vh - 74px); }
.screen-reader-text, .skill4-skip-link { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skill4-skip-link:focus { z-index: 100; top: 12px; left: 12px; width: auto; height: auto; padding: 10px 14px; clip: auto; background: var(--s4-ink); color: var(--s4-surface); }

.skill4-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--s4-line);
  background: rgba(255, 254, 250, .98);
}
.skill4-header-inner { display: flex; min-height: 74px; align-items: center; gap: 30px; }
.skill4-brand { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 10px; color: var(--s4-ink); font-size: 17px; font-weight: 700; letter-spacing: -.04em; }
.skill4-brand-mark { display: grid; width: 30px; height: 30px; place-items: center; border: 1px solid var(--s4-accent); border-radius: 8px; color: var(--s4-accent); font-size: 10px; font-weight: 700; letter-spacing: -.08em; }
.skill4-primary-nav { min-width: 0; flex: 1 1 auto; }
.skill4-nav-list { display: flex; flex-wrap: wrap; align-items: center; gap: 3px 5px; margin: 0; padding: 0; list-style: none; }
.skill4-nav-list a { display: inline-flex; min-height: 44px; align-items: center; padding: 8px 11px; color: var(--s4-muted); font-size: 13px; transition: color .18s var(--s4-ease), background .18s var(--s4-ease); }
.skill4-nav-list a:hover, .skill4-nav-list .current-menu-item > a { border-radius: 8px; background: var(--s4-surface-muted); color: var(--s4-ink); }
.skill4-header-actions { display: flex; flex: 0 0 auto; align-items: center; gap: 10px; }
.skill4-header-search, .skill4-search { display: flex; min-height: 44px; align-items: center; gap: 9px; border: 1px solid var(--s4-line); border-radius: 10px; background: var(--s4-surface); }
.skill4-header-search { width: 190px; padding: 0 12px; }
.skill4-header-search svg, .skill4-search svg { width: 18px; height: 18px; flex: 0 0 auto; fill: none; stroke: var(--s4-faint); stroke-linecap: round; stroke-width: 1.7; }
.skill4-header-search input, .skill4-search input { min-width: 0; flex: 1; border: 0; outline: 0; background: transparent; color: var(--s4-ink); }
.skill4-header-search input::placeholder, .skill4-search input::placeholder { color: var(--s4-faint); }
.skill4-button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 9px 16px; border-radius: 9px; background: var(--s4-accent); color: #f8fbf7; font-size: 13px; font-weight: 600; line-height: 1.2; transition: background .18s var(--s4-ease), transform .18s var(--s4-ease); }
.skill4-button:hover { background: #204943; transform: translateY(-1px); }
.skill4-button-quiet { background: var(--s4-ink); white-space: nowrap; }
.skill4-button-quiet:hover { background: #111817; }
.skill4-button-outline { border: 1px solid var(--s4-line-strong); background: transparent; color: var(--s4-ink); }
.skill4-button-outline:hover { background: var(--s4-surface); color: var(--s4-ink); }

.skill4-main { padding: 0 0 90px; }
.skill4-home-main { padding-bottom: 0; }
.skill4-home-hero { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(250px, .55fr); gap: clamp(40px, 8vw, 120px); min-height: 490px; align-items: end; padding: clamp(76px, 10vw, 128px) 0 68px; border-bottom: 1px solid var(--s4-line); }
.skill4-hero-copy { max-width: 760px; }
.skill4-kicker { margin: 0; color: var(--s4-warm); font-size: 11px; font-weight: 700; letter-spacing: .14em; line-height: 1.3; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2, h3 { margin-top: 0; color: var(--s4-ink); font-weight: 600; letter-spacing: -.055em; }
.skill4-home-hero h1 { max-width: 780px; margin: 16px 0 22px; font-size: clamp(38px, 5.3vw, 66px); line-height: 1.02; }
.skill4-home-hero h1 em { color: var(--s4-accent); font-style: normal; }
.skill4-lead { max-width: 660px; margin: 0; color: var(--s4-muted); font-size: clamp(16px, 1.5vw, 19px); line-height: 1.65; }
.skill4-search { width: min(100%, 620px); margin-top: 30px; padding: 4px 5px 4px 14px; }
.skill4-search-large { min-height: 52px; border-radius: 11px; }
.skill4-search-large input { font-size: 14px; }
.skill4-hero-note { align-self: stretch; display: flex; flex-direction: column; justify-content: flex-end; padding: 0 0 8px; border-left: 1px solid var(--s4-line-strong); }
.skill4-note-number { margin-left: 24px; color: var(--s4-faint); font-size: 11px; letter-spacing: .14em; }
.skill4-hero-note > p { max-width: 250px; margin: 12px 24px 34px; font-size: 17px; font-weight: 500; letter-spacing: -.035em; line-height: 1.45; }
.skill4-hero-links { display: grid; border-top: 1px solid var(--s4-line); }
.skill4-hero-links a { display: flex; min-height: 44px; align-items: center; justify-content: space-between; padding: 0 24px; border-bottom: 1px solid var(--s4-line); color: var(--s4-muted); font-size: 13px; }
.skill4-hero-links a:hover { background: var(--s4-surface-muted); color: var(--s4-ink); }
.skill4-hero-links span { color: var(--s4-ink); font-size: 12px; }

.skill4-section { padding: 72px 0 86px; border-bottom: 1px solid var(--s4-line); }
.skill4-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 26px; }
.skill4-section-heading h2 { margin: 8px 0 0; font-size: clamp(26px, 3vw, 38px); line-height: 1.1; }
.skill4-text-link { color: var(--s4-accent); font-size: 13px; font-weight: 600; text-decoration: underline; text-decoration-color: var(--s4-line-strong); text-underline-offset: 5px; }
.skill4-text-link:hover { text-decoration-color: var(--s4-accent); }
.skill4-card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.skill4-card { min-width: 0; border: 1px solid var(--s4-line); border-radius: var(--s4-radius); background: var(--s4-surface); transition: border-color .18s var(--s4-ease), transform .18s var(--s4-ease), background .18s var(--s4-ease); }
.skill4-card:hover { border-color: var(--s4-line-strong); background: #fff; transform: translateY(-2px); }
.skill4-card-link { display: flex; min-height: 208px; flex-direction: column; padding: 19px 19px 17px; }
.skill4-card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.skill4-eyebrow { color: var(--s4-warm); font-size: 10px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.skill4-status-dot { width: 7px; height: 7px; flex: 0 0 auto; border-radius: 50%; background: var(--s4-accent); }
.skill4-card h2 { margin: 18px 0 9px; font-size: 17px; line-height: 1.25; }
.skill4-card p { margin: 0; color: var(--s4-muted); font-size: 13px; line-height: 1.55; }
.skill4-card-meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; padding-top: 18px; color: var(--s4-faint); font-size: 11px; }
.skill4-card-meta span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.skill4-empty { padding: 18px 0; color: var(--s4-muted); }
.skill4-principles { display: grid; grid-template-columns: minmax(230px, .7fr) minmax(0, 1.3fr); gap: clamp(40px, 8vw, 120px); padding: 80px 0 100px; }
.skill4-principles h2 { max-width: 350px; margin: 12px 0 0; font-size: clamp(26px, 3.2vw, 42px); line-height: 1.1; }
.skill4-principle-list { border-top: 1px solid var(--s4-line); }
.skill4-principle-list > div { display: grid; grid-template-columns: 48px 1fr; gap: 14px; padding: 17px 0; border-bottom: 1px solid var(--s4-line); }
.skill4-principle-list span { color: var(--s4-faint); font-size: 11px; letter-spacing: .12em; }
.skill4-principle-list p { margin: 0; max-width: 540px; color: var(--s4-muted); font-size: 15px; }

.skill4-page-intro { max-width: 820px; padding: 84px 0 54px; }
.skill4-page-intro h1 { margin: 14px 0 18px; font-size: clamp(36px, 5vw, 58px); line-height: 1.04; }
.skill4-page-intro .skill4-search { margin-top: 28px; }
.skill4-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 40px; padding-bottom: 12px; border-bottom: 1px solid var(--s4-line); }
.skill4-tabs a { display: inline-flex; min-height: 40px; align-items: center; padding: 7px 15px; border: 1px solid transparent; border-radius: 999px; color: var(--s4-muted); font-size: 13px; }
.skill4-tabs a:hover { border-color: var(--s4-line); color: var(--s4-ink); }
.skill4-tabs a.is-active { border-color: var(--s4-line-strong); background: var(--s4-surface); color: var(--s4-ink); font-weight: 600; }
.skill4-library-layout { display: grid; grid-template-columns: 205px minmax(0, 1fr); gap: 46px; }
.skill4-sidebar { min-width: 0; }
.skill4-sidebar-title { margin-bottom: 12px; color: var(--s4-faint); font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.skill4-filter-list { display: grid; gap: 3px; }
.skill4-filter-chip { display: flex; min-height: 40px; align-items: center; justify-content: space-between; gap: 8px; padding: 7px 9px; border: 1px solid transparent; border-radius: 8px; color: var(--s4-muted); font-size: 12px; }
.skill4-filter-chip:hover, .skill4-filter-chip.is-active { border-color: var(--s4-line); background: var(--s4-surface); color: var(--s4-ink); }
.skill4-filter-chip span { color: var(--s4-faint); }
.skill4-sidebar-link { display: inline-flex; min-height: 44px; align-items: center; margin-top: 14px; color: var(--s4-accent); font-size: 12px; text-decoration: underline; text-underline-offset: 4px; }
.skill4-results { min-width: 0; }
.skill4-results-toolbar { display: flex; min-height: 40px; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--s4-line); color: var(--s4-muted); font-size: 13px; }
.skill4-results-toolbar strong { color: var(--s4-ink); font-size: 16px; font-weight: 600; }
.skill4-results-hint { color: var(--s4-faint); font-size: 11px; }
.skill4-results .skill4-card-grid { padding-top: 18px; }
.skill4-pagination { margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--s4-line); }
.skill4-pagination-list { display: flex; flex-wrap: wrap; gap: 5px; }
.skill4-pagination a, .skill4-pagination span { display: inline-flex; min-width: 40px; min-height: 40px; align-items: center; justify-content: center; padding: 6px 11px; border: 1px solid var(--s4-line); border-radius: 8px; color: var(--s4-muted); font-size: 12px; }
.skill4-pagination a:hover, .skill4-pagination .current { border-color: var(--s4-accent); background: var(--s4-accent); color: #fff; }

.skill4-breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; padding-top: 44px; color: var(--s4-faint); font-size: 12px; }
.skill4-breadcrumbs a:hover { color: var(--s4-accent); text-decoration: underline; text-underline-offset: 3px; }
.skill4-entry { margin-top: 24px; border-top: 1px solid var(--s4-line); }
.skill4-entry-header { max-width: 880px; padding: 42px 0 38px; }
.skill4-entry-labels { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.skill4-verification { color: var(--s4-muted); font-size: 11px; }
.skill4-entry-header h1 { margin: 16px 0 18px; font-size: clamp(34px, 5vw, 58px); line-height: 1.04; }
.skill4-entry-lead { max-width: 760px; margin: 0; color: var(--s4-muted); font-size: 18px; line-height: 1.65; }
.skill4-entry-meta { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; color: var(--s4-faint); font-size: 12px; }
.skill4-entry-meta a { color: var(--s4-accent); }
.skill4-entry-layout { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(240px, .65fr); gap: clamp(40px, 8vw, 105px); padding-top: 40px; border-top: 1px solid var(--s4-line); }
.skill4-entry-content { min-width: 0; color: #3d4644; font-size: 16px; line-height: 1.78; }
.skill4-content-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-bottom: 24px; padding-bottom: 12px; border-bottom: 1px solid var(--s4-line); color: var(--s4-faint); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; }
.skill4-inline-button { min-height: 36px; padding: 5px 10px; border: 1px solid var(--s4-line); border-radius: 8px; background: transparent; color: var(--s4-accent); cursor: pointer; font-size: 11px; text-transform: none; }
.skill4-inline-button:hover { background: var(--s4-accent-soft); }
.skill4-entry-content article { max-width: none; }
.skill4-entry-content h2 { margin: 38px 0 13px; font-size: 24px; line-height: 1.25; }
.skill4-entry-content h3 { margin: 28px 0 10px; font-size: 18px; }
.skill4-entry-content p { margin: 0 0 17px; }
.skill4-entry-content a { color: var(--s4-accent); text-decoration: underline; text-decoration-color: #b9cec8; text-underline-offset: 3px; }
.skill4-entry-content ul, .skill4-entry-content ol { margin: 0 0 22px; padding-left: 24px; }
.skill4-entry-content li + li { margin-top: 8px; }
.skill4-entry-content pre, .skill4-entry-content code { font-family: "SFMono-Regular", Consolas, monospace; }
.skill4-entry-content pre { overflow: auto; max-width: 100%; padding: 17px; border: 1px solid var(--s4-line); border-radius: 10px; background: var(--s4-surface-muted); color: var(--s4-ink); font-size: 13px; line-height: 1.65; white-space: pre-wrap; overflow-wrap: anywhere; }
.skill4-entry-content code { padding: 2px 5px; border-radius: 5px; background: var(--s4-surface-muted); color: var(--s4-ink); font-size: .88em; }
.skill4-entry-content pre code { padding: 0; background: transparent; }
.skill4-entry-content table { display: block; width: 100%; max-width: 100%; margin: 24px 0; overflow-x: auto; border-collapse: collapse; }
.skill4-entry-content th, .skill4-entry-content td { min-width: 120px; padding: 10px 12px; border-bottom: 1px solid var(--s4-line); text-align: left; vertical-align: top; }
.skill4-entry-content th { color: var(--s4-ink); font-size: 12px; }
.skill4-entry-content img { max-width: 100%; }
.skill4-entry-aside { min-width: 0; }
.skill4-detail-block { padding: 18px 0; border-top: 1px solid var(--s4-line); }
.skill4-detail-block:last-child { border-bottom: 1px solid var(--s4-line); }
.skill4-detail-block h2 { margin: 0 0 7px; color: var(--s4-faint); font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.skill4-detail-text { margin: 0; color: var(--s4-muted); font-size: 13px; line-height: 1.65; }
.skill4-related { padding: 76px 0 0; }
.skill4-related .skill4-section-heading { margin-bottom: 24px; }
.skill4-related h2 { font-size: 30px; }

.skill4-term-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.skill4-term-card { display: flex; min-height: 150px; flex-direction: column; justify-content: space-between; padding: 18px; border: 1px solid var(--s4-line); border-radius: var(--s4-radius); background: var(--s4-surface); }
.skill4-term-card:hover { border-color: var(--s4-line-strong); }
.skill4-term-card span { color: var(--s4-ink); font-weight: 600; }
.skill4-term-card strong { color: var(--s4-accent); font-size: 30px; letter-spacing: -.06em; }
.skill4-term-card small { color: var(--s4-faint); font-size: 11px; }
.skill4-tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.skill4-tag-link { display: inline-flex; min-height: 42px; align-items: center; gap: 8px; padding: 7px 12px; border: 1px solid var(--s4-line); border-radius: 999px; background: var(--s4-surface); color: var(--s4-muted); font-size: 12px; }
.skill4-tag-link:hover { border-color: var(--s4-accent); color: var(--s4-accent); }
.skill4-tag-link span { color: var(--s4-faint); }
.skill4-not-found { padding: 130px 0; }
.skill4-not-found h1 { margin: 14px 0 16px; font-size: clamp(38px, 6vw, 64px); }
.skill4-button-row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 28px; }

.skill4-footer { border-top: 1px solid var(--s4-line); background: var(--s4-surface); }
.skill4-footer-inner { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 30px; padding: 42px 0 34px; }
.skill4-brand-footer { font-size: 15px; }
.skill4-footer p { max-width: 250px; margin: 12px 0 0; color: var(--s4-muted); font-size: 12px; }
.skill4-footer .skill4-nav-list { display: grid; justify-items: start; gap: 0; }
.skill4-footer .skill4-nav-list a { min-height: 34px; padding: 2px 0; font-size: 12px; }
.skill4-footer-note { justify-self: end; text-align: right; }
.skill4-footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding: 13px 0 17px; border-top: 1px solid var(--s4-line); color: var(--s4-faint); font-size: 11px; }
.skill4-footer-bottom a { color: var(--s4-accent); }

@media (max-width: 980px) {
  .skill4-header-inner { flex-wrap: wrap; gap: 8px 20px; padding-block: 9px; }
  .skill4-primary-nav { order: 3; flex-basis: 100%; border-top: 1px solid var(--s4-line); }
  .skill4-nav-list a { min-height: 38px; }
  .skill4-header-actions { margin-left: auto; }
  .skill4-home-hero { grid-template-columns: minmax(0, 1fr) minmax(230px, .55fr); }
  .skill4-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .skill4-library-layout { gap: 28px; }
}

@media (max-width: 720px) {
  .skill4-container { width: min(calc(100% - 32px), var(--s4-container)); }
  .skill4-header-inner { align-items: center; }
  .skill4-header-actions { width: 100%; }
  .skill4-header-search { flex: 1; width: auto; }
  .skill4-button-quiet { font-size: 12px; }
  .skill4-home-hero { display: block; min-height: auto; padding: 60px 0 46px; }
  .skill4-home-hero h1 { font-size: clamp(38px, 11vw, 54px); }
  .skill4-hero-note { margin-top: 56px; border-top: 1px solid var(--s4-line-strong); border-left: 0; padding-top: 20px; }
  .skill4-note-number, .skill4-hero-note > p { margin-left: 0; }
  .skill4-hero-note > p { margin-bottom: 22px; }
  .skill4-section, .skill4-principles { padding-block: 56px; }
  .skill4-section-heading { align-items: flex-start; flex-direction: column; }
  .skill4-principles { display: block; }
  .skill4-principle-list { margin-top: 38px; }
  .skill4-page-intro { padding: 58px 0 40px; }
  .skill4-page-intro h1 { font-size: clamp(36px, 10vw, 52px); }
  .skill4-library-layout { display: block; }
  .skill4-sidebar { margin-bottom: 30px; padding-bottom: 18px; border-bottom: 1px solid var(--s4-line); }
  .skill4-filter-list { display: flex; flex-wrap: wrap; gap: 5px; }
  .skill4-filter-chip { min-height: 38px; padding-inline: 11px; border-color: var(--s4-line); background: var(--s4-surface); }
  .skill4-sidebar-link { margin-top: 5px; }
  .skill4-results-toolbar { align-items: flex-start; flex-direction: column; gap: 4px; }
  .skill4-entry-layout { display: block; }
  .skill4-entry-aside { margin-top: 46px; }
  .skill4-term-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .skill4-footer-inner { grid-template-columns: 1fr 1fr; }
  .skill4-footer-note { grid-column: 1 / -1; justify-self: start; text-align: left; }
}

@media (max-width: 480px) {
  .skill4-header-actions { align-items: stretch; }
  .skill4-button-quiet { padding-inline: 11px; }
  .skill4-card-grid, .skill4-term-grid { grid-template-columns: 1fr; }
  .skill4-card-link { min-height: 190px; }
  .skill4-search { width: 100%; }
  .skill4-search .skill4-button { padding-inline: 12px; }
  .skill4-footer-inner { grid-template-columns: 1fr; }
  .skill4-footer-note { grid-column: auto; }
  .skill4-footer-bottom { flex-direction: column; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* IIFY directory system: reused public tokens and editorial geometry. */
.skill4-site-shell { position: relative; min-height: 100vh; isolation: isolate; width: min(100%, 1232px); margin: 0 auto; border-inline: 1px solid rgba(220, 215, 200, .72); background: var(--s4-bg); }
.skill4-grid-overlay { position: fixed; inset: 57px 0 0; z-index: 0; display: grid; grid-template-columns: minmax(24px, 1fr) min(1152px, calc(100% - 48px)) minmax(24px, 1fr); pointer-events: none; }
.skill4-grid-overlay span { min-height: 100%; border-inline: 1px solid rgba(220, 215, 200, .72); }
.skill4-grid-overlay span:first-child, .skill4-grid-overlay span:last-child { background: repeating-linear-gradient(135deg, transparent 0 8px, rgba(178, 172, 157, .14) 8px 9px); }
.skill4-grid-overlay span:nth-child(2) { background-image: radial-gradient(rgba(115, 111, 102, .13) .65px, transparent .75px); background-size: 5px 5px; }
.skill4-main, .skill4-footer, .skill4-page-shell { position: relative; z-index: 1; }
.skill4-header { position: relative; z-index: 20; min-height: 57px; border-bottom: 1px solid var(--s4-line); background: rgba(240, 238, 230, .94); }
.skill4-header-inner { min-height: 57px; align-items: center; gap: 26px; }
.skill4-brand { gap: 8px; color: var(--s4-ink); font-size: 17px; font-weight: 700; letter-spacing: -.055em; }
.skill4-brand-mark { width: 25px; height: 25px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.35; }
.skill4-primary-nav { flex: 0 1 auto; margin-right: auto; }
.skill4-nav-list { gap: 20px; }
.skill4-nav-list a { min-height: auto; padding: 7px 0; border-bottom: 1px solid transparent; border-radius: 0; color: var(--s4-muted); font-size: 13px; transition: color .18s ease, border-color .18s ease; }
.skill4-nav-list a:hover, .skill4-nav-list .current-menu-item > a { border-radius: 0; background: transparent; color: var(--s4-ink); border-color: var(--s4-ink); }
.skill4-header-actions { gap: 9px; }
.skill4-header-search { width: 144px; min-height: 38px; height: 38px; padding: 0 10px; border-radius: 8px; }
.skill4-header-search svg { width: 17px; height: 17px; margin-right: 7px; }
.skill4-header-search input { font-size: 13px; }
.skill4-button { min-height: 40px; padding: 0 14px; border: 1px solid var(--s4-ink); border-radius: 8px; color: var(--s4-surface); background: var(--s4-ink); font-size: 13px; font-weight: 600; transition: background .18s ease, transform .18s ease; }
.skill4-button:hover { color: var(--s4-surface); background: var(--s4-accent); transform: translateY(-1px); }
.skill4-button-quiet { min-height: 37px; border-radius: 10px; }

.skill4-home-hero { display: block; min-height: 443px; padding: 110px 0 86px; border-bottom: 1px solid var(--s4-line); }
.skill4-home-hero h1, .skill4-page-intro h1 { max-width: 700px; margin: 0 0 24px; color: var(--s4-ink); font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; font-size: clamp(39px, 4.2vw, 53px); font-weight: 400; letter-spacing: -.065em; line-height: 1.1; }
.skill4-home-hero h1 em, .skill4-page-intro h1 em { color: #5c5d5b; font-style: normal; }
.skill4-hero-copy { max-width: 670px; }
.skill4-lead { max-width: 670px; margin: 0 0 28px; color: var(--s4-muted); font-size: 15px; line-height: 1.55; }
.skill4-search-large { width: min(100%, 640px); min-height: 50px; height: 50px; padding: 4px 5px 4px 14px; border-radius: 9px; }
.skill4-home-hero .skill4-search-large { margin-top: 28px; }
.skill4-hero-note { display: none; }
.skill4-hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 28px; }
.skill4-home-section, .skill4-section { padding: 62px 0 72px; border-bottom: 1px solid var(--s4-line); }
.skill4-section-heading { align-items: flex-end; margin-bottom: 24px; }
.skill4-section-heading h2 { margin: 8px 0 0; color: var(--s4-ink); font-family: ui-serif, Georgia, "Times New Roman", serif; font-size: clamp(25px, 3vw, 36px); font-weight: 400; letter-spacing: -.07em; line-height: 1.05; }
.skill4-text-link { color: var(--s4-ink); border-bottom: 1px solid currentColor; font-size: 13px; text-decoration: none; text-underline-offset: 4px; }
.skill4-text-link:hover { color: var(--s4-accent); }
.skill4-category-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.skill4-category-chip { padding: 7px 12px; border: 1px solid #d9d5ca; border-radius: 999px; color: #4d4e4b; background: rgba(251, 250, 246, .7); font-size: 12px; transition: border-color .18s ease, background-color .18s ease, transform .18s ease; }
.skill4-category-chip:hover { border-color: #aaa69b; background: #fffef9; transform: translateY(-1px); }

.skill4-card-grid { gap: 16px; }
.skill4-card { min-width: 0; min-height: 158px; padding: 4px; border: 0; border-radius: 16px; background: rgba(231, 228, 217, .72); box-shadow: none; transition: background .18s ease, transform .18s ease; }
.skill4-card:hover { border: 0; background: rgba(226, 223, 213, .86); transform: none; }
.skill4-card-link { display: flex; min-height: 150px; flex-direction: column; padding: 0; }
.skill4-card-heading { display: flex; min-width: 0; min-height: 36px; align-items: center; padding: 8px 12px; }
.skill4-card-name { display: block; min-width: 0; margin: 0; overflow: hidden; color: var(--s4-ink); font-size: 14px; font-weight: 600; line-height: 20px; letter-spacing: 0; text-overflow: ellipsis; white-space: nowrap; }
.skill4-card-body { display: flex; min-width: 0; min-height: 82px; flex: 1 1 auto; align-items: center; gap: 12px; padding: 16px; border: 1px solid var(--s4-line); border-radius: 14px; background: var(--s4-bg); box-shadow: 0 1px 2px rgba(0, 0, 0, .05); }
.skill4-card-icon { display: grid; width: 48px; height: 48px; flex: 0 0 48px; place-items: center; border: 1px solid var(--s4-line); border-radius: 14px; color: var(--s4-muted); background: var(--s4-bg); font-size: 16px; font-weight: 650; }
.skill4-card-body p { display: -webkit-box; min-width: 0; min-height: 48px; margin: 0; overflow: hidden; color: #5f5e59; font-size: 12px; line-height: 16px; -webkit-box-orient: vertical; -webkit-line-clamp: 3; }
.skill4-card-meta { display: flex; min-height: 32px; align-items: center; gap: 8px; padding: 8px 12px; color: #5f5e59; font-size: 12px; font-weight: 400; line-height: 16px; }
.skill4-card-meta strong { color: inherit; font-weight: 400; text-transform: uppercase; }
.skill4-card-meta span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.skill4-home-cta { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin: 34px 0 70px; padding: 30px 32px; border-radius: 15px; color: #f8f7f2; background: #10100f; }
.skill4-home-cta .skill4-kicker { color: #b8b6ad; }
.skill4-home-cta h2 { margin: 8px 0 0; color: #f8f7f2; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; font-size: clamp(25px, 3.3vw, 38px); font-weight: 400; letter-spacing: -.06em; line-height: 1.04; }
.skill4-home-cta h2 em { color: #aaa9a2; font-style: normal; }
.skill4-home-cta .skill4-button { border-color: #f8f7f2; color: var(--s4-ink); background: #f8f7f2; }
.skill4-home-cta .skill4-button:hover { color: var(--s4-ink); background: #fff; }

.skill4-page-intro { max-width: 820px; padding: 82px 0 48px; }
.skill4-page-intro h1 { max-width: 700px; margin: 18px 0 22px; }
.skill4-library-layout { grid-template-columns: 240px minmax(0, 1fr); gap: 40px; padding: 48px 0 80px; }
.skill4-sidebar { min-width: 0; margin: 0; padding: 0; }
.skill4-sidebar-title { color: var(--s4-muted); font-size: 11px; font-weight: 500; letter-spacing: .16em; line-height: 16.5px; text-transform: uppercase; }
.skill4-filter-list { gap: 0; margin-top: 17px; }
.skill4-filter-chip { min-height: 32px; padding: 6px 0; border: 0; border-radius: 0; color: var(--s4-muted); background: transparent; font-size: 14px; line-height: 20px; }
.skill4-filter-chip:hover, .skill4-filter-chip.is-active { border: 0; background: transparent; color: var(--s4-ink); }
.skill4-filter-chip span { color: inherit; }
.skill4-results { min-width: 0; padding-top: 0; }
.skill4-results-toolbar { padding-bottom: 16px; border-bottom: 1px solid var(--s4-line); color: var(--s4-muted); font-size: 14px; line-height: 20px; }
.skill4-results-toolbar strong { color: var(--s4-muted); font-weight: 400; }
.skill4-results .skill4-card-grid { padding-top: 24px; }
.skill4-tabs { gap: 1px; padding: 4px; border: 1px solid var(--s4-line); border-radius: 999px; background: var(--s4-surface-muted); }
.skill4-tabs a { min-height: 32px; padding: 6px 16px; border-radius: 999px; color: var(--s4-muted); font-size: 12px; line-height: 16px; }
.skill4-tabs a:hover { border-color: transparent; background: transparent; color: var(--s4-ink); }
.skill4-tabs a.is-active { border-color: transparent; color: var(--s4-ink); background: var(--s4-surface); box-shadow: 0 1px 2px rgba(12, 12, 11, .06); }

.skill4-item-container { padding-bottom: 78px; }
.skill4-item-main .skill4-breadcrumbs { padding: 54px 0 30px; color: var(--s4-muted); font-size: 13px; }
.skill4-item-main .skill4-breadcrumbs span:last-child { color: var(--s4-ink); }
.skill4-item-detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(330px, 420px); gap: 24px; align-items: start; }
.skill4-item-stage { position: relative; display: flex; min-height: min(70vh, 760px); overflow: hidden; align-items: center; justify-content: center; border: 1px solid var(--s4-line); border-radius: 15px; background: #e8e5dc; }
.skill4-item-stage-content { display: flex; width: 100%; min-height: min(70vh, 760px); flex-direction: column; justify-content: space-between; padding: clamp(28px, 6vw, 72px); background: var(--s4-card); }
.skill4-item-stage-kicker { color: var(--s4-accent); font-size: 10px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.skill4-item-stage-mark { display: grid; width: 66px; height: 66px; margin-top: auto; margin-bottom: 28px; place-items: center; border: 1px solid var(--s4-line-strong); border-radius: 16px; color: var(--s4-muted); background: var(--s4-surface); font-size: 22px; font-weight: 600; }
.skill4-item-stage h2 { max-width: 620px; margin: 0 0 14px; color: var(--s4-ink); font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; font-size: clamp(31px, 5vw, 58px); font-weight: 400; letter-spacing: -.075em; line-height: 1.03; }
.skill4-item-stage p { max-width: 600px; margin: 0; color: var(--s4-muted); font-size: 16px; line-height: 1.6; }
.skill4-item-stage-footer { margin-top: 42px; color: var(--s4-faint); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; }
.skill4-item-panel { min-width: 0; padding: 8px 1px 0; }
.skill4-item-panel-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; padding-bottom: 17px; border-bottom: 1px solid var(--s4-line); }
.skill4-item-author { display: flex; align-items: center; gap: 10px; min-width: 0; }
.skill4-item-avatar { display: inline-grid; flex: 0 0 auto; width: 34px; height: 34px; place-items: center; border-radius: 50%; color: var(--s4-muted); background: var(--s4-surface-muted); font-size: 12px; font-weight: 700; }
.skill4-item-author div { display: grid; gap: 2px; min-width: 0; }
.skill4-item-author strong { overflow: hidden; color: var(--s4-ink); font-size: 13px; text-overflow: ellipsis; white-space: nowrap; }
.skill4-item-author div span { color: #92908a; font-size: 11px; }
.skill4-item-model { flex: 0 0 auto; padding: 6px 8px; border-radius: 6px; color: var(--s4-accent); background: var(--s4-accent-soft); font-size: 10px; font-weight: 700; }
.skill4-item-actions { display: flex; flex-wrap: wrap; gap: 7px; margin: 17px 0 27px; }
.skill4-action-button { display: inline-flex; min-height: 35px; align-items: center; justify-content: center; padding: 7px 11px; border: 1px solid #dbe2ea; border-radius: 7px; color: #647384; background: var(--s4-surface); cursor: pointer; font-size: 11px; font-weight: 700; transition: color .18s ease, border-color .18s ease, background-color .18s ease; }
.skill4-action-button:hover { border-color: #bed0e3; color: var(--s4-accent); background: #f5f8fc; }
.skill4-action-link { background: #f2f6fb; }
.skill4-item-detail-label { margin-bottom: 9px; color: var(--s4-accent); font-size: 10px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.skill4-item-panel h1 { margin: 0 0 16px; color: var(--s4-ink); font-family: inherit; font-size: clamp(22px, 2.5vw, 31px); font-weight: 720; letter-spacing: -.055em; line-height: 1.08; }
.skill4-item-body { max-height: 430px; overflow: auto; color: #656e78; font-size: 13px; line-height: 1.68; scrollbar-color: #cfd6de transparent; }
.skill4-item-body p { margin: 0 0 14px; }
.skill4-item-body h2 { margin: 28px 0 10px; color: var(--s4-ink); font-size: 18px; }
.skill4-item-body h3 { margin: 20px 0 8px; color: var(--s4-ink); font-size: 15px; }
.skill4-item-body a { color: var(--s4-accent); text-decoration: underline; text-underline-offset: 3px; }
.skill4-item-body ul, .skill4-item-body ol { padding-left: 20px; }
.skill4-item-body pre { max-width: 100%; overflow: auto; padding: 14px; border: 1px solid var(--s4-line); border-radius: 9px; background: var(--s4-surface-muted); white-space: pre-wrap; overflow-wrap: anywhere; }
.skill4-item-body code { font-family: "SFMono-Regular", Consolas, monospace; }
.skill4-item-stats { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; color: #969da5; font-size: 10px; }
.skill4-item-section { padding: 56px 0; border-top: 1px solid var(--s4-line); }
.skill4-section-label { color: var(--s4-muted); font-size: 11px; font-weight: 650; letter-spacing: .12em; line-height: 1.4; text-transform: uppercase; }
.skill4-two-column { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(240px, .7fr); gap: 62px; }
.skill4-item-section h2 { margin: 13px 0 18px; color: var(--s4-ink); font-family: ui-serif, Georgia, "Times New Roman", serif; font-size: clamp(23px, 3vw, 33px); font-weight: 400; letter-spacing: -.07em; line-height: 1.1; }
.skill4-rich-text { max-width: 720px; margin: 0; color: var(--s4-muted); font-size: 16px; line-height: 1.7; }
.skill4-tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.skill4-tag-list a { padding: 5px 10px; border: 1px solid var(--s4-line); border-radius: 999px; color: var(--s4-muted); background: var(--s4-surface); font-size: 11px; }
.skill4-tag-list a:hover { color: var(--s4-ink); border-color: var(--s4-ink); }
.skill4-facts-list { display: grid; align-content: start; }
.skill4-fact { padding: 15px 0; border-top: 1px solid var(--s4-line); }
.skill4-fact:last-child { border-bottom: 1px solid var(--s4-line); }
.skill4-fact span { display: block; color: var(--s4-muted); font-size: 12px; }
.skill4-fact p { display: block; margin: 5px 0 0; color: var(--s4-ink); font-size: 16px; line-height: 1.5; }
.skill4-list-columns { gap: 70px; }
.skill4-clean-list { margin: 0; padding: 0; list-style: none; color: var(--s4-muted); }
.skill4-clean-list li { position: relative; padding: 12px 0 12px 20px; border-top: 1px solid var(--s4-line); }
.skill4-clean-list li::before { position: absolute; top: 18px; left: 0; width: 7px; height: 7px; border-radius: 50%; background: var(--s4-accent); content: ""; }
.skill4-related { padding-top: 58px; }
.skill4-related .skill4-section-heading { margin-bottom: 24px; }
.skill4-footer { border-top: 1px solid var(--s4-line); color: var(--s4-muted); background: var(--s4-bg); font-size: 12px; }
.skill4-footer-inner { display: grid; grid-template-columns: minmax(260px, 1.7fr) 1fr 1fr; gap: 40px; padding-top: 42px; padding-bottom: 38px; border-top: 0; }
.skill4-footer-brand p, .skill4-footer p { max-width: 230px; margin: 14px 0 0; color: #75746e; font-size: 12px; line-height: 1.55; }
.skill4-footer nav { display: grid; align-content: start; gap: 9px; }
.skill4-footer nav strong { margin-bottom: 4px; color: var(--s4-ink); font-family: ui-serif, Georgia, serif; font-size: 16px; font-weight: 400; }
.skill4-footer nav a { color: #6d6c66; font-size: 12px; }
.skill4-footer nav a:hover { color: var(--s4-ink); }
.skill4-footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 14px; padding-bottom: 20px; border-top: 1px solid var(--s4-line); color: #8b8981; font-size: 10px; }

@media (max-width: 900px) {
  .skill4-header-inner { flex-wrap: wrap; padding-block: 10px; }
  .skill4-primary-nav { order: 3; width: 100%; }
  .skill4-nav-list { gap: 18px; overflow-x: auto; }
  .skill4-header-actions { margin-left: auto; }
  .skill4-header-search { width: 150px; }
  .skill4-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .skill4-library-layout { grid-template-columns: 1fr; gap: 30px; }
  .skill4-filter-list { display: flex; flex-wrap: wrap; gap: 4px 14px; }
  .skill4-filter-chip { min-height: 32px; }
  .skill4-item-detail-layout, .skill4-two-column { grid-template-columns: 1fr; gap: 30px; }
  .skill4-item-stage, .skill4-item-stage-content { min-height: 420px; }
  .skill4-item-body { max-height: none; overflow: visible; }
  .skill4-related .skill4-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .skill4-container { padding-inline: 18px; }
  .skill4-grid-overlay { grid-template-columns: 16px minmax(0, 1fr) 16px; }
  .skill4-header-inner { align-items: flex-start; gap: 10px; }
  .skill4-header-actions { width: 100%; margin-left: 0; }
  .skill4-header-search { flex: 1; width: auto; }
  .skill4-header-actions .skill4-button { min-height: 42px; }
  .skill4-home-hero, .skill4-page-intro { padding: 60px 0 52px; }
  .skill4-home-hero h1, .skill4-page-intro h1 { font-size: clamp(43px, 14vw, 64px); }
  .skill4-lead { font-size: 16px; }
  .skill4-search-large { height: auto; min-height: 48px; }
  .skill4-search-large .skill4-button { min-height: 38px; padding-inline: 12px; }
  .skill4-section-heading, .skill4-results-toolbar { align-items: flex-start; flex-direction: column; }
  .skill4-home-section, .skill4-item-section { padding-block: 44px; }
  .skill4-home-cta { align-items: flex-start; flex-direction: column; margin-bottom: 46px; padding: 24px 20px; }
  .skill4-home-cta .skill4-button { width: 100%; }
  .skill4-card-grid { grid-template-columns: 1fr; }
  .skill4-card-body p { min-height: auto; }
  .skill4-item-container { padding-bottom: 56px; }
  .skill4-item-main .skill4-breadcrumbs { padding: 28px 0 17px; }
  .skill4-item-stage, .skill4-item-stage-content { min-height: 360px; }
  .skill4-item-stage-content { padding: 28px 25px; }
  .skill4-item-stage h2 { font-size: clamp(32px, 11vw, 48px); }
  .skill4-item-actions { margin: 13px 0 23px; }
  .skill4-action-button { min-height: 42px; padding-inline: 13px; }
  .skill4-related .skill4-card-grid { grid-template-columns: 1fr; }
  .skill4-footer-inner { align-items: flex-start; grid-template-columns: 1fr 1fr; gap: 28px 20px; }
  .skill4-footer-inner > :first-child { grid-column: 1 / -1; }
  .skill4-footer-bottom { align-items: flex-start; flex-direction: column; gap: 5px; }
}
@media (max-width: 420px) {
  .skill4-header-actions .skill4-button { padding-inline: 10px; font-size: 11px; }
  .skill4-header-search input { font-size: 12px; }
}