:root {
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --bg-muted: #eef0f7;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --text: #17182b;
  --text-soft: #60647a;
  --text-faint: #85899c;
  --border: #e1e3ec;
  --border-strong: #ccd0dd;
  --primary: #5b5ce2;
  --primary-deep: #4446c9;
  --primary-soft: #eeefff;
  --accent: #29b6a8;
  --success: #14845f;
  --success-soft: #e7f8f1;
  --danger: #c83f54;
  --danger-soft: #fff0f2;
  --hero-start: #23245c;
  --hero-end: #4547b9;
  --shadow-sm: 0 8px 24px rgba(26, 28, 61, 0.08);
  --shadow-md: 0 20px 55px rgba(26, 28, 61, 0.13);
  --radius-sm: 12px;
  --radius: 18px;
  --radius-lg: 28px;
  --container: 1180px;
  --narrow: 920px;
  --header-height: 76px;
}

html[data-theme="dark"] {
  --bg: #12131c;
  --bg-soft: #181a25;
  --bg-muted: #1d1f2c;
  --surface: #1b1d29;
  --surface-raised: #222431;
  --text: #f5f6fb;
  --text-soft: #b5b8c9;
  --text-faint: #8e92a7;
  --border: #303342;
  --border-strong: #414557;
  --primary: #898aff;
  --primary-deep: #7375f0;
  --primary-soft: #292a49;
  --accent: #58d2c3;
  --success: #65d4aa;
  --success-soft: #17372e;
  --danger: #ff8595;
  --danger-soft: #3d2026;
  --hero-start: #171834;
  --hero-end: #343681;
  --shadow-sm: 0 10px 28px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 24px 65px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
img { max-width: 100%; }
.icon { width: 1.25em; height: 1.25em; flex: 0 0 auto; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.container.narrow { width: min(calc(100% - 40px), var(--narrow)); }
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 82%, transparent);
  backdrop-filter: blur(18px);
}
.header-inner {
  width: min(calc(100% - 40px), var(--container));
  height: var(--header-height);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; min-width: max-content; }
.brand img { width: 40px; height: 40px; border-radius: 11px; box-shadow: 0 8px 20px rgba(91, 92, 226, .18); }
.brand span { display: grid; line-height: 1.05; }
.brand strong { font-size: 1.02rem; letter-spacing: -.02em; }
.brand small { margin-top: 5px; color: var(--text-soft); font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.desktop-nav { display: flex; align-items: center; justify-content: center; gap: 6px; margin-left: auto; }
.desktop-nav a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 42px;
  padding: 0 14px;
  color: var(--text-soft);
  border-radius: 11px;
  font-size: .92rem;
  font-weight: 700;
  transition: background .18s ease, color .18s ease;
}
.desktop-nav a:hover, .desktop-nav a[aria-current="page"] { color: var(--text); background: var(--bg-soft); }
.desktop-nav .icon { width: 15px; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-button {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}
.icon-button:hover { border-color: var(--border-strong); background: var(--bg-soft); transform: translateY(-1px); }
.theme-dark, html[data-theme="dark"] .theme-light { display: none; }
html[data-theme="dark"] .theme-dark { display: inline-flex; }
.menu-toggle { display: none; }
.menu-close { display: none; }
.menu-toggle[aria-expanded="true"] .menu-open { display: none; }
.menu-toggle[aria-expanded="true"] .menu-close { display: inline-flex; }
.mobile-nav { display: none; }

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 480px;
  display: grid;
  place-items: center;
  padding: 76px 0 88px;
  color: #fff;
  background: linear-gradient(135deg, var(--hero-start), var(--hero-end));
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(to bottom, black, transparent 95%);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(10px); opacity: .36; z-index: -1; }
.hero-glow-one { width: 420px; height: 420px; right: -120px; top: -180px; background: #8c8eff; }
.hero-glow-two { width: 360px; height: 360px; left: -130px; bottom: -190px; background: #3ad7c4; }
.hero-content { text-align: center; }
.eyebrow {
  margin: 0 0 12px;
  color: rgba(255,255,255,.78);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.eyebrow.dark { color: var(--primary); }
.hero h1, .page-hero h1, .article-header h1, .empty-state h1 {
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -.055em;
}
.hero-copy { max-width: 710px; margin: 20px auto 34px; color: rgba(255,255,255,.78); font-size: clamp(1.02rem, 2vw, 1.2rem); }
.search-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
}
.search-shell > .icon { width: 24px; height: 24px; margin-left: 20px; color: var(--text-soft); }
.search-shell input {
  min-width: 0;
  flex: 1;
  height: 66px;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
}
.search-shell input::placeholder { color: var(--text-faint); }
.search-shell button {
  min-width: 108px;
  height: 48px;
  margin-right: 9px;
  padding: 0 20px;
  border: 0;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  transition: background .18s ease, transform .18s ease;
}
.search-shell button:hover { background: var(--primary-deep); transform: translateY(-1px); }
.hero-search { width: min(100%, 760px); margin-inline: auto; color: var(--text); text-align: left; }
.popular-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 16px; margin-top: 20px; color: rgba(255,255,255,.68); font-size: .87rem; }
.popular-tags a { color: #fff; font-weight: 700; text-decoration: underline; text-decoration-color: rgba(255,255,255,.35); text-underline-offset: 4px; }
.live-search-results {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: 0;
  z-index: 30;
  max-height: 460px;
  overflow-y: auto;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-raised);
  box-shadow: var(--shadow-md);
}
.live-search-item { display: flex; align-items: center; gap: 18px; padding: 13px 14px; border-radius: 12px; color: var(--text); }
.live-search-item:hover { background: var(--bg-soft); }
.live-search-item > span:first-child { display: grid; gap: 3px; min-width: 0; }
.live-search-item strong { font-size: .95rem; }
.live-search-item small { color: var(--text-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.live-search-item em { color: var(--primary); font-size: .73rem; font-style: normal; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }
.live-search-arrow { margin-left: auto; color: var(--primary); font-size: 1.25rem; }
.live-search-all { display: block; margin-top: 5px; padding: 12px 14px; border-top: 1px solid var(--border); color: var(--primary); font-weight: 800; text-align: center; }
.live-search-empty { padding: 18px; color: var(--text-soft); text-align: center; }

.section { padding-block: 84px; }
.section-muted { background: var(--bg-soft); border-block: 1px solid var(--border); }
.section-heading { display: grid; grid-template-columns: 1.15fr .85fr; align-items: end; gap: 50px; margin-bottom: 34px; }
.section-heading.compact { grid-template-columns: 1fr; }
.section-heading h2, .support-card h2, .related-articles h2, .info-card h2 {
  margin: 0;
  font-size: clamp(1.65rem, 3vw, 2.45rem);
  line-height: 1.12;
  letter-spacing: -.04em;
}
.section-heading > p { margin: 0 0 5px; color: var(--text-soft); }
.category-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.category-card {
  position: relative;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  min-height: 154px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 1px 0 rgba(0,0,0,.015);
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.category-card:hover { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); box-shadow: var(--shadow-sm); transform: translateY(-3px); }
.category-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  background: var(--primary-soft);
  color: var(--primary);
}
.category-icon .icon { width: 28px; height: 28px; }
.category-icon.large { width: 76px; height: 76px; border-radius: 22px; }
.category-icon.large .icon { width: 36px; height: 36px; }
.category-card-copy { min-width: 0; display: grid; gap: 6px; }
.category-card-copy strong { font-size: 1.06rem; line-height: 1.25; }
.category-card-copy small { color: var(--text-soft); line-height: 1.45; }
.category-card-copy em { color: var(--primary); font-size: .78rem; font-style: normal; font-weight: 800; }
.card-arrow { color: var(--text-faint); transition: transform .2s ease, color .2s ease; }
.category-card:hover .card-arrow { color: var(--primary); transform: translateX(4px); }

.article-list { display: grid; gap: 10px; }
.popular-list { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.popular-list .article-row { min-height: 140px; align-items: flex-start; }
.article-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 17px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface);
  transition: border-color .18s ease, background .18s ease, transform .18s ease;
}
.article-row:hover { border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); background: var(--surface-raised); transform: translateY(-1px); }
.article-row-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 12px; background: var(--primary-soft); color: var(--primary); }
.article-row > span:nth-child(2) { min-width: 0; display: grid; gap: 4px; }
.article-row strong { font-size: .98rem; line-height: 1.35; }
.article-row small { color: var(--text-soft); line-height: 1.45; }
.article-row em { color: var(--text-faint); font-size: .76rem; font-style: normal; font-weight: 700; }
.article-row > .icon { color: var(--text-faint); }
.article-row-large { padding: 21px 22px; }
.article-row-large strong { font-size: 1.05rem; }

.support-options { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.support-card { min-height: 340px; display: flex; align-items: flex-start; gap: 24px; padding: 42px; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); overflow: hidden; }
.support-card-primary { color: #fff; background: linear-gradient(145deg, #4446b9, #686af1); border-color: transparent; }
.support-card-icon { width: 60px; height: 60px; display: grid; place-items: center; flex: 0 0 auto; border-radius: 17px; background: var(--primary-soft); color: var(--primary); }
.support-card-primary .support-card-icon { background: rgba(255,255,255,.14); color: #fff; }
.support-card-icon .icon { width: 29px; height: 29px; }
.support-card p:not(.eyebrow) { max-width: 430px; margin: 15px 0 26px; color: var(--text-soft); }
.support-card-primary p:not(.eyebrow) { color: rgba(255,255,255,.78); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 0 19px; border: 1px solid transparent; border-radius: 12px; font-weight: 800; transition: transform .18s ease, background .18s ease, border-color .18s ease; }
.button:hover { transform: translateY(-1px); }
.button .icon { width: 17px; }
.button-primary { background: var(--primary); color: #fff; }
.button-primary:hover { background: var(--primary-deep); }
.button-light { background: #fff; color: #30319d; }
.button-secondary { border-color: var(--border); background: var(--surface); color: var(--text); }

.page-main { min-height: 65vh; }
.page-hero { padding: 52px 0 58px; border-bottom: 1px solid var(--border); background: var(--bg-soft); }
.page-hero h1 { font-size: clamp(2.25rem, 5vw, 4rem); }
.page-hero > .container > p:last-child { max-width: 760px; margin: 17px 0 0; color: var(--text-soft); font-size: 1.05rem; }
.breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin-bottom: 34px; color: var(--text-soft); font-size: .83rem; font-weight: 700; }
.breadcrumbs a { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumbs a:hover { color: var(--primary); }
.breadcrumbs > .icon { width: 14px; }
.breadcrumbs a .icon { width: 15px; }
.category-title-block { display: flex; align-items: center; gap: 24px; }
.category-title-block h1 { margin: 0; }
.category-title-block > div > p:last-child { max-width: 650px; margin: 11px 0 0; color: var(--text-soft); }
.inline-search { max-width: 690px; margin-top: 34px; box-shadow: var(--shadow-sm); }
.inline-search input { height: 58px; }
.inline-search button { height: 42px; }
.category-articles { padding-top: 54px; }

.article-container { padding-top: 34px; padding-bottom: 90px; }
.article-breadcrumbs { margin-bottom: 42px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 72px; align-items: start; }
.article-content { min-width: 0; }
.platform-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.platform-chips span { padding: 6px 10px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); font-size: .75rem; font-weight: 800; }
.article-header { padding-bottom: 34px; border-bottom: 1px solid var(--border); }
.article-header h1 { font-size: clamp(2.15rem, 4.5vw, 3.65rem); }
.article-lead { max-width: 760px; margin: 18px 0 22px; color: var(--text-soft); font-size: 1.12rem; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; color: var(--text-faint); font-size: .82rem; font-weight: 700; }
.article-meta span { display: inline-flex; align-items: center; gap: 7px; }
.article-meta .icon { width: 16px; }
.article-body { padding-top: 12px; font-size: 1.02rem; }
.article-body section { scroll-margin-top: calc(var(--header-height) + 24px); padding-top: 36px; }
.article-body h2 { margin: 0 0 17px; font-size: clamp(1.35rem, 2.5vw, 1.78rem); line-height: 1.2; letter-spacing: -.025em; }
.article-body p { margin: 0 0 17px; color: var(--text-soft); }
.article-body ul, .article-body ol { margin: 0 0 19px; padding-left: 1.35rem; color: var(--text-soft); }
.article-body li { margin: 9px 0; padding-left: 5px; }
.article-body li::marker { color: var(--primary); font-weight: 800; }
.article-body strong { color: var(--text); }
.article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-body code { padding: 2px 6px; border-radius: 6px; background: var(--bg-muted); color: var(--text); font-size: .9em; }
.article-aside { position: sticky; top: calc(var(--header-height) + 28px); display: grid; gap: 14px; }
.toc-card, .aside-support-card { padding: 20px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); }
.toc-card > strong { display: block; margin-bottom: 12px; font-size: .88rem; }
.toc-card nav { display: grid; gap: 4px; }
.toc-card a { padding: 7px 8px; border-left: 2px solid var(--border); color: var(--text-soft); font-size: .82rem; line-height: 1.35; }
.toc-card a:hover { border-left-color: var(--primary); color: var(--primary); }
.aside-support-card > .icon { width: 25px; height: 25px; color: var(--primary); }
.aside-support-card strong { display: block; margin-top: 12px; }
.aside-support-card p { margin: 5px 0 13px; color: var(--text-soft); font-size: .85rem; }
.aside-support-card a { color: var(--primary); font-size: .84rem; font-weight: 800; }
.article-feedback { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 18px; margin-top: 54px; padding: 24px; border: 1px solid var(--border); border-radius: 18px; background: var(--bg-soft); }
.article-feedback > div:first-child { display: grid; gap: 3px; }
.article-feedback span { color: var(--text-soft); font-size: .86rem; }
.feedback-actions { display: flex; gap: 8px; }
.feedback-actions button { display: inline-flex; align-items: center; gap: 7px; min-height: 42px; padding: 0 14px; border: 1px solid var(--border); border-radius: 11px; background: var(--surface); color: var(--text); font-weight: 800; }
.feedback-actions button:hover { border-color: var(--primary); color: var(--primary); }
.feedback-actions button:disabled { opacity: .55; cursor: default; }
.feedback-actions .icon { width: 16px; }
.feedback-status { grid-column: 1 / -1; min-height: 1.2em; margin: -7px 0 0; color: var(--primary); font-size: .83rem; }
.article-feedback.submitted .feedback-actions { display: none; }
.related-articles { margin-top: 54px; padding-top: 42px; border-top: 1px solid var(--border); }
.related-articles h2 { margin-bottom: 22px; }

.search-page-hero h1 { margin-bottom: 28px; }
.search-page-hero .inline-search { margin-top: 0; }
.search-results-page { padding-top: 48px; }
.results-summary { margin-bottom: 22px; color: var(--text-soft); }
.results-summary strong { color: var(--text); }
.empty-state { max-width: 700px; margin: 30px auto; padding: 70px 24px; text-align: center; }
.empty-state > .icon { width: 48px; height: 48px; margin-bottom: 16px; color: var(--primary); }
.empty-state h2 { margin: 0 0 8px; font-size: 1.7rem; }
.empty-state p { margin: 0 0 24px; color: var(--text-soft); }
.not-found { padding-block: 100px; }
.error-code { display: inline-block; margin-bottom: 12px; color: var(--primary); font-size: 5rem; font-weight: 900; line-height: 1; letter-spacing: -.08em; }
.not-found-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

.contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 28px; align-items: start; }
.contact-form-card, .info-card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.contact-form-card { padding: 34px; }
.contact-form { display: grid; gap: 20px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form label { display: grid; gap: 8px; }
.contact-form label > span { font-size: .88rem; font-weight: 800; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  background: var(--bg-soft);
  color: var(--text);
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}
.contact-form input, .contact-form select { height: 50px; padding: 0 14px; }
.contact-form textarea { min-height: 190px; padding: 13px 14px; resize: vertical; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-color: var(--primary); background: var(--surface); box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 14%, transparent); }
.contact-form label small { color: var(--text-faint); font-size: .77rem; }
.button-submit { width: max-content; min-width: 175px; }
.honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.contact-aside { display: grid; gap: 16px; }
.info-card { padding: 24px; }
.info-card h2 { font-size: 1.15rem; margin-bottom: 13px; }
.info-card ul { margin: 0; padding-left: 1.2rem; color: var(--text-soft); }
.info-card li { margin: 8px 0; }
.email-link { display: flex; align-items: center; gap: 9px; color: var(--primary); font-weight: 800; word-break: break-all; }
.alert { display: flex; align-items: flex-start; gap: 13px; margin-bottom: 24px; padding: 17px; border-radius: 13px; }
.alert > .icon { width: 22px; height: 22px; margin-top: 2px; }
.alert p { margin: 3px 0 0; }
.alert ul { margin: 5px 0 0; padding-left: 1.2rem; }
.alert.success { background: var(--success-soft); color: var(--success); }
.alert.error { background: var(--danger-soft); color: var(--danger); }
.direct-mail { padding: 35px 10px; text-align: center; }
.direct-mail > .icon { width: 46px; height: 46px; color: var(--primary); }
.direct-mail h2 { margin: 14px 0 7px; }
.direct-mail p { color: var(--text-soft); }
.direct-mail a { color: var(--primary); font-weight: 800; }

.site-footer { padding: 58px 0 22px; border-top: 1px solid var(--border); background: var(--bg-soft); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 45px; }
.footer-brand p { max-width: 300px; margin: 18px 0 0; color: var(--text-soft); font-size: .9rem; }
.footer-grid > div:not(.footer-brand) { display: grid; align-content: start; gap: 9px; }
.footer-grid h2 { margin: 0 0 5px; font-size: .84rem; text-transform: uppercase; letter-spacing: .08em; }
.footer-grid > div:not(.footer-brand) a { color: var(--text-soft); font-size: .88rem; }
.footer-grid > div:not(.footer-brand) a:hover { color: var(--primary); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 45px; padding-top: 22px; border-top: 1px solid var(--border); color: var(--text-faint); font-size: .78rem; }

@media (max-width: 980px) {
  .popular-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .support-options { grid-template-columns: 1fr; }
  .support-card { min-height: 280px; }
  .article-layout { grid-template-columns: 1fr; gap: 40px; }
  .article-aside { position: static; grid-template-columns: 1fr 1fr; }
  .toc-card { display: none; }
  .contact-layout { grid-template-columns: 1fr; }
  .contact-aside { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr; }
  .footer-grid > div:last-child { grid-column: 2 / 4; }
}

@media (max-width: 760px) {
  :root { --header-height: 68px; }
  .container, .container.narrow, .header-inner { width: min(calc(100% - 28px), var(--container)); }
  .desktop-nav { display: none; }
  .menu-toggle { display: inline-grid; }
  .mobile-nav {
    position: fixed;
    inset: var(--header-height) 0 auto;
    display: grid;
    gap: 4px;
    max-height: 0;
    overflow: hidden;
    padding: 0 14px;
    border-bottom: 1px solid transparent;
    background: var(--surface);
    opacity: 0;
    transition: max-height .25s ease, padding .25s ease, opacity .2s ease, border-color .2s ease;
  }
  .mobile-nav.open { max-height: 300px; padding: 12px 14px 18px; border-color: var(--border); opacity: 1; box-shadow: var(--shadow-md); }
  .mobile-nav a { padding: 13px 14px; border-radius: 11px; color: var(--text-soft); font-weight: 800; }
  .mobile-nav a:hover { background: var(--bg-soft); color: var(--text); }
  .hero { min-height: 450px; padding: 62px 0 68px; }
  .hero h1 { font-size: clamp(2.35rem, 12vw, 3.5rem); }
  .hero-copy { margin: 17px auto 27px; }
  .search-shell { gap: 8px; border-radius: 14px; }
  .search-shell > .icon { margin-left: 15px; width: 21px; }
  .search-shell input { height: 59px; font-size: .94rem; }
  .search-shell button { min-width: 82px; height: 43px; margin-right: 7px; padding-inline: 13px; }
  .live-search-item small { white-space: normal; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
  .popular-tags { gap: 7px 12px; }
  .section { padding-block: 62px; }
  .section-heading { grid-template-columns: 1fr; align-items: start; gap: 12px; margin-bottom: 27px; }
  .category-grid { grid-template-columns: 1fr; }
  .category-card { min-height: 138px; padding: 20px; }
  .popular-list { grid-template-columns: 1fr; }
  .popular-list .article-row { min-height: auto; }
  .support-card { min-height: 0; padding: 30px; flex-direction: column; }
  .page-hero { padding: 38px 0 43px; }
  .breadcrumbs { margin-bottom: 25px; }
  .category-title-block { align-items: flex-start; }
  .category-icon.large { width: 62px; height: 62px; border-radius: 18px; }
  .category-icon.large .icon { width: 30px; }
  .article-container { padding-top: 24px; }
  .article-breadcrumbs { margin-bottom: 32px; }
  .article-header h1 { font-size: clamp(2.1rem, 10vw, 3rem); }
  .article-lead { font-size: 1.03rem; }
  .article-feedback { grid-template-columns: 1fr; }
  .feedback-status { grid-column: auto; }
  .article-aside { grid-template-columns: 1fr; }
  .contact-form-card { padding: 22px; }
  .form-grid { grid-template-columns: 1fr; }
  .contact-aside { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px 24px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-grid > div:last-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; gap: 6px; }
}

@media (max-width: 500px) {
  .brand img { width: 36px; height: 36px; }
  .brand small { display: none; }
  .icon-button { width: 39px; height: 39px; }
  .hero { min-height: 430px; }
  .hero-search button { font-size: 0; min-width: 48px; padding: 0; }
  .hero-search button::after { content: "→"; font-size: 1.2rem; }
  .category-card { grid-template-columns: 50px minmax(0, 1fr); gap: 14px; }
  .category-icon { width: 50px; height: 50px; border-radius: 14px; }
  .category-icon .icon { width: 24px; }
  .category-card > .card-arrow { display: none; }
  .article-row { grid-template-columns: 40px minmax(0, 1fr); }
  .article-row > .icon { display: none; }
  .article-row-icon { width: 38px; height: 38px; }
  .category-title-block { gap: 14px; }
  .category-title-block .category-icon.large { display: none; }
  .feedback-actions { width: 100%; }
  .feedback-actions button { flex: 1; justify-content: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand, .footer-grid > div:last-child { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}