@font-face {
  font-family: 'Adderley';
  src: url('/fonts/adderley_bold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ============================================================
   main.css — Sibpipe.ru Design System
   CSS Variables, Reset, Base Typography, Layout, Navigation,
   Header, Footer, Search, CTA, FAQ, Breadcrumbs, Print
   ============================================================ */

/* ---- CSS Variables ---- */
:root {
  /* Colors */
  --color-primary:     #3855AB;
  --color-secondary:   #3855AB;
  --color-accent:      #3855AB;
  --color-bg:          #FFFFFF;
  --color-bg-alt:      #F5F5F5;
  --color-text:        #111111;
  --color-text-light:  #6B7280;
  --color-border:      #E5E7EB;
  --color-success:     #16A34A;
  --color-warning:     #D97706;
  --color-danger:      #DC2626;

  /* Derived tones */
  --color-primary-dark:    #2d4897;
  --color-accent-dark:     #2d4897;
  --color-badge-gas-text:  #B45309;
  --color-badge-success:   #15803D;
  --color-badge-danger:    #B91C1C;
  --color-skeleton-mid:    #EBEBEB;

  /* Typography */
  --font-display: 'Adderley', 'Barlow Condensed', Impact, sans-serif;
  --font-main:    'Onest', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    'Roboto Mono', monospace;

  /* Layout */
  --max-width:     1200px;
  --header-height: 64px;

  /* Misc */
  --radius:     4px;
  --radius-lg:  6px;
  --shadow:     0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.10);
  --transition: 0.2s ease;
  --ease-out:    cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);

  /* Spacing scale */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
}

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "cv05" 1;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
  color: inherit;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 150ms ease-out;
}

a:hover,
a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---- Skip navigation link ---- */
.skip-link {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  text-decoration: none;
}

.skip-link:focus {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  width: auto;
  height: auto;
  padding: 10px 16px;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: nowrap;
  background: var(--color-bg);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9375rem;
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

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

/* ---- Container ---- */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  /* боковые отступы + safe-area (env=0 без выреза → просто 20px; в ландшафте на notch-устройствах отступает) */
  padding-inline: max(20px, env(safe-area-inset-left)) max(20px, env(safe-area-inset-right));
}

/* ---- Typography ---- */
h1 {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

h2 {
  font-family: var(--font-display);
  font-size: clamp(1.625rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

h5,
h6 {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-alt);
  padding: 2px 5px;
  border-radius: 3px;
  border: 1px solid var(--color-border);
}

pre {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 1rem;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 1em;
}

strong,
b {
  font-weight: 600;
}

em,
i {
  font-style: italic;
}

small {
  font-size: 0.875em;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 24px 0;
}

blockquote {
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  margin: 0 0 1rem 0;
  color: var(--color-text-light);
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

/* ---- Main Content Area ---- */
main {
  padding: 0 0 20px;
  min-height: calc(100vh - var(--header-height) - 320px);  /* fallback */
  min-height: calc(100svh - var(--header-height) - 320px);
}

/* ---- Page Layout (Sidebar) ---- */
.page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

/* Grid-колонка обязана сжиматься меньше min-content своего содержимого,
   иначе широкая таблица распирает страницу (см. правила раскладки) */
.page-main {
  min-width: 0;
}

/* ---- Breadcrumbs ---- */
.breadcrumbs-wrap {
  padding-top: 16px;
}

.breadcrumbs {
  padding: 12px 0;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: center;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
}

.breadcrumbs li::after {
  content: "›";
  margin: 0 6px;
  color: var(--color-border);
  font-size: 1rem;
}

.breadcrumbs li:last-child::after {
  content: none;
}

.breadcrumbs a {
  color: var(--color-text-light);
  transition: color var(--transition);
}

.breadcrumbs a:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 160; /* выше мобильного меню (150) — бургер-«крестик» кликабелен; ниже поиска (200) */
  background: #FFFFFF;
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.site-header .container {
  display: grid;
  /* mobile: лого | действия (меню скрыто). 3-я колонка вернётся на десктопе (≥900),
     иначе при display:none у .main-nav действия уезжают в среднюю колонку. */
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  height: 100%;
}

/* ---- Logo ---- */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  flex-shrink: 0;
  border-radius: 4px;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.375rem;
  color: var(--color-text);
  line-height: 1;
  letter-spacing: 0.04em;
}

.logo-tld {
  color: var(--color-primary);
}

/* ---- Main Navigation ---- */
.main-nav {
  /* center column in header grid */
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav__item {
  position: relative;
}

.main-nav__link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-light);
  white-space: nowrap;
  transition: background 150ms ease-out, color 150ms ease-out;
  text-decoration: none;
}

.main-nav__link:hover,
.main-nav__link:focus-visible {
  background: rgba(21, 51, 232, 0.06);
  color: var(--color-primary);
  text-decoration: none;
}

.main-nav__link--parent {
  cursor: pointer;
}

.main-nav__arrow {
  flex-shrink: 0;
  transition: transform 200ms var(--ease-out);
}

.main-nav__item--has-dropdown:hover .main-nav__arrow,
.main-nav__item--has-dropdown:focus-within .main-nav__arrow {
  transform: rotate(180deg);
}

/* ---- Dropdown Menu ---- */
.dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 110;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  min-width: 220px;
  padding: 6px 0;
  /* Hidden by default */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 180ms var(--ease-out), visibility 180ms linear, transform 180ms var(--ease-out);
}

.main-nav__item--has-dropdown:hover .dropdown,
.main-nav__item--has-dropdown:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Overflow-guard: right-align dropdowns for last two nav items */
.main-nav__item:last-child .dropdown,
.main-nav__item:nth-last-child(2) .dropdown {
  left: auto;
  right: 0;
}

.dropdown__item {
  /* reset */
}

.dropdown__link {
  display: block;
  padding: 8px 16px;
  font-size: 0.9rem;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
}

.dropdown__link:hover,
.dropdown__link:focus-visible {
  background: rgba(21, 51, 232, 0.05);
  color: var(--color-primary);
  text-decoration: none;
}

/* ---- Header Actions ---- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-self: end;
}

.search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  color: var(--color-text-light);
  transition: background 150ms ease-out, color 150ms ease-out;
}

.search-btn:hover,
.search-btn:focus-visible {
  background: rgba(21, 51, 232, 0.06);
  color: var(--color-primary);
}

/* ---- Hamburger (Mobile) ---- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg);
  color: var(--color-text);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.hamburger:hover,
.hamburger[aria-expanded="true"] {
  background: rgba(56, 85, 171, 0.06);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.hamburger__line {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Mobile Menu ----
   Панель ниже шапки: .site-header имеет z-index выше меню, поэтому бургер-«крестик»
   остаётся видимым и кликабельным поверх открытого меню. */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: var(--color-bg);
  transform: translateX(100%);
  visibility: hidden; /* закрытое меню не должно распирать scrollWidth страницы */
  transition: transform var(--transition), visibility var(--transition);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: calc(var(--header-height) + 8px) 0 40px;
}

.mobile-menu.is-open {
  transform: translateX(0);
  visibility: visible;
}

.mobile-menu__inner {
  padding-inline: clamp(20px, 5vw, 48px);
}

.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 140;
  background: rgba(15, 18, 26, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.mobile-menu-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
}

.mobile-nav__item {
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav__link {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 17px 2px;
  font-family: var(--font-main);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
  background: none;
  border: none;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--transition);
}

.mobile-nav__link:hover,
.mobile-nav__link[aria-expanded="true"] {
  color: var(--color-primary);
  text-decoration: none;
}

.mobile-nav__arrow {
  flex-shrink: 0;
  width: 13px;
  height: 8px;
  color: var(--color-text-light);
  transition: transform var(--transition), color var(--transition);
}

.mobile-nav__link[aria-expanded="true"] .mobile-nav__arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.mobile-nav__sub {
  display: none;
  flex-direction: column;
  padding: 2px 0 14px 2px;
}

.mobile-nav__sub.is-open {
  display: flex;
}

.mobile-nav__sub-link {
  display: block;
  padding: 11px 14px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-light);
  border-left: 1px solid var(--color-border);
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition);
}

.mobile-nav__sub-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  text-decoration: none;
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-text);
  border-top: none;
  padding: 48px 0 24px;
  margin-top: 48px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-col__title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: 12px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-nav li {
  display: flex;
  flex-direction: column;
}

.footer-nav a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 2;
  text-decoration: none;
  transition: color 150ms ease-out;
}

.footer-nav a:hover {
  color: white;
  text-decoration: none;
}

.footer-nav__note {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.35);
  line-height: 1.4;
  margin-top: -4px;
  margin-bottom: 4px;
}

.footer-contacts {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-contacts__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-contacts__icon {
  flex-shrink: 0;
  color: rgba(255, 255, 255, 0.4);
}

.footer-contacts__link {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: color 150ms ease-out;
}

.footer-contacts__link:hover {
  color: white;
}

.footer-about {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.35);
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 2px;
}

.footer-disclaimer {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.25);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links a {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
  text-decoration: none;
  transition: color 150ms ease-out;
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* ---- Author Box ---- */
.author-box {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 24px 0;
  background: var(--color-bg-alt);
}

.author-box__avatar {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-secondary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  overflow: hidden;
}

.author-box__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-box__name {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-primary);
  margin-bottom: 2px;
}

.author-box__role {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.author-box__bio {
  font-size: 0.875rem;
  color: var(--color-text);
  margin: 0;
}

/* ---- Quick Info Bar ---- */
.quick-info-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  background: var(--color-bg-alt);
  padding: 16px;
  border-radius: var(--radius);
  margin: 16px 0;
  border: 1px solid var(--color-border);
}

.quick-info-card {
  text-align: center;
  padding: 8px 4px;
}

.quick-info-card .label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-bottom: 4px;
  line-height: 1.3;
}

.quick-info-card .value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

/* ---- Pipe SVG Container ---- */
.pipe-svg-container {
  max-width: 300px;
  margin: 0 auto;
  padding: 16px;
}

/* ---- Search Overlay ---- */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 80px;
  /* Hidden by default */
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.search-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.search-overlay__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  border-radius: var(--radius);
  font-size: 1.5rem;
  transition: background var(--transition);
}

.search-overlay__close:hover {
  background: rgba(255, 255, 255, 0.15);
}

.search-overlay__input {
  width: min(600px, 90%);
  padding: 16px 20px;
  font-size: 1.1rem;
  font-family: var(--font-main);
  border-radius: var(--radius-lg);
  border: none;
  box-shadow: var(--shadow-md);
  outline: none;
  color: var(--color-text);
  background: var(--color-bg);
}

.search-overlay__input:focus {
  box-shadow: 0 0 0 3px rgba(21, 51, 232, 0.20), var(--shadow-md);
}

.search-overlay__results {
  width: min(600px, 90%);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  margin-top: 8px;
  max-height: 400px;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
}

.search-result-item {
  display: block;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: background var(--transition);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--color-bg-alt);
  text-decoration: none;
}

.search-result-item__title {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-primary);
  margin-bottom: 2px;
}

.search-result-item__snippet {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* ---- CTA Block ---- */
.cta-block {
  background: var(--color-primary);
  color: white;
  padding: 32px;
  border-radius: var(--radius);
  margin: 32px 0;
}

.cta-block__title {
  font-size: 1.375rem;
  font-weight: 700;
  color: white;
  margin-bottom: 8px;
}

.cta-block__text {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 20px;
}

.cta-block__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.cta-block__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 12px 24px;
  border-radius: var(--radius);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  z-index: 0;
  border: 1px solid transparent;
  transition: color .2s cubic-bezier(.37,0,.63,1),
              border-color .2s cubic-bezier(.37,0,.63,1);
}

.cta-block__btn::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  width: var(--btn-ripple-size, 300px);
  height: var(--btn-ripple-size, 300px);
  left: var(--btn-ripple-x, 50%);
  top: var(--btn-ripple-y, 50%);
  transform: translate3d(-50%, -50%, 0) scale(0);
  transform-origin: center;
  transition: transform .4s cubic-bezier(.37,0,.63,1);
  z-index: 0;
  pointer-events: none;
}

.cta-block__btn.is-hovered::after {
  transform: translate3d(-50%, -50%, 0) scale(1.5);
}

.cta-block__btn .btn__inner,
.cta-block__btn svg {
  position: relative;
  z-index: 1;
}

.cta-block__btn--primary {
  background: white;
  color: var(--color-primary);
  border-color: white;
}
.cta-block__btn--primary::after {
  background-color: var(--color-primary);
}
.cta-block__btn--primary.is-hovered {
  color: white;
  border-color: var(--color-primary);
}

.cta-block__btn--secondary {
  background: transparent;
  color: white;
  border-color: rgba(255, 255, 255, 0.6);
}
.cta-block__btn--secondary::after {
  background-color: rgba(255, 255, 255, 0.15);
}
.cta-block__btn--secondary.is-hovered {
  color: white;
  border-color: white;
}

/* ---- Related Links ---- */
.related-links {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  margin-top: 32px;
}

.related-links__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.related-links ul {
  columns: 1;
  gap: 8px;
}

.related-links li {
  break-inside: avoid;
  margin-bottom: 6px;
}

.related-links a {
  font-size: 0.9rem;
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.related-links a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ---- FAQ ---- */
.faq-section {
  margin: 32px 0;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq-item summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-text);
  list-style: none;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
  transition: color var(--transition);
}

/* Remove default disclosure triangle */
.faq-item summary::-webkit-details-marker {
  display: none;
}

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

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-secondary);
  transition: transform var(--transition), color var(--transition);
  margin-top: -1px;
}

.faq-item[open] summary {
  color: var(--color-primary);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 0 16px 0;
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ---- Notices ---- */
.notice-info,
.notice-warning,
.notice-success,
.notice-danger {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.notice-info {
  border: 1px solid rgba(21, 51, 232, 0.20);
  background: rgba(21, 51, 232, 0.05);
  color: var(--color-text);
}

.notice-warning {
  border: 1px solid rgba(214, 158, 46, 0.35);
  background: rgba(214, 158, 46, 0.10);
  color: var(--color-text);
}

.notice-success {
  border: 1px solid rgba(56, 161, 105, 0.30);
  background: rgba(56, 161, 105, 0.09);
  color: var(--color-text);
}

.notice-danger {
  border: 1px solid rgba(229, 62, 62, 0.30);
  background: rgba(229, 62, 62, 0.09);
  color: var(--color-text);
}

/* ---- Print Styles ---- */
@media print {
  .site-header,
  .site-footer,
  .main-nav,
  .mobile-menu,
  .mobile-menu-overlay,
  .hamburger,
  .search-btn,
  .search-overlay,
  .cta-block,
  .breadcrumbs,
  .pagination,
  .sidebar {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }

  a[href^="#"]::after,
  a[href^="javascript:"]::after {
    content: none;
  }

  h1, h2, h3, h4 {
    color: #000;
    page-break-after: avoid;
  }

  p, blockquote {
    orphans: 3;
    widows: 3;
  }

  .page-layout {
    display: block;
  }

  main {
    padding: 0;
  }

  .table-wrapper {
    overflow-x: visible;
  }
}

/* ---- Article Content (blog posts) ---- */
.article-content {
  max-width: 760px;
}

.article-content h1 { margin-bottom: 1.5rem; }

.article-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.article-content h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.article-content p,
.article-content ul,
.article-content ol {
  line-height: 1.75;
  margin-bottom: 1rem;
}

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

.article-content li { margin-bottom: 0.35rem; }

.article-content table {
  margin: 1.5rem 0;
}

/* Formula blocks */
.formula-block {
  background: var(--color-bg-alt);
  border: 1px solid rgba(21, 51, 232, 0.15);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}

/* Category intro block */
.category-intro {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 2rem;
}

.category-intro p { margin-bottom: 0.5rem; }
.category-intro p:last-child { margin-bottom: 0; }

/* Feature list */
.feature-list {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.feature-list li {
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

/* Info block */
.info-block {
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-top: 2rem;
}

.info-block h2 { margin-top: 0; }