@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

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

:root {
  --blue: #3bb1ff;
  --red: #ff5252;
  --black: #000000;
  --white: #ffffff;
  --off-white: #f5f5f0;
  --border: 3px solid #000;
  --shadow: 5px 5px 0 #000;
  --shadow-sm: 3px 3px 0 #000;
  --radius-card: 28px;
  --radius-btn: 6px;
  --sidebar-w: 220px;
  --font: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --transition: 0.15s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--black);
  background: var(--off-white);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

dl, dt, dd {
  margin: 0;
  padding: 0;
}

/* ===== Layout: Site Wrap ===== */
.site-wrap {
  display: flex;
  min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--black);
  border-right: var(--border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-brand {
  padding: 20px 16px 16px;
  border-bottom: 3px solid #333;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 3px solid var(--blue);
  object-fit: cover;
}

.brand-icon-text {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--blue);
  border: 3px solid var(--blue);
  border-radius: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--black);
  box-shadow: var(--shadow-sm);
}

.sidebar-nav {
  flex: 1;
  padding: 16px 0;
}

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

.nav-section-label {
  color: #666;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0 16px 8px;
}

.sidebar-nav dt,
.sidebar-nav dd {
  display: block;
}

.sidebar-nav dt a,
.sidebar-nav dd a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  color: #ccc;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.4;
  min-height: 44px;
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
}

.sidebar-nav dt a:hover,
.sidebar-nav dd a:hover,
.sidebar-nav dt.active a,
.sidebar-nav dd.active a {
  background: #1a1a1a;
  color: var(--blue);
  border-left-color: var(--blue);
}

.sidebar-contact {
  padding: 16px;
  border-top: 3px solid #333;
}

.contact-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  background: var(--blue);
  border: var(--border);
  border-radius: var(--radius-btn);
  color: var(--black);
  font-weight: 700;
  font-size: 0.85rem;
  min-height: 44px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.contact-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--black);
}

.contact-btn.active {
  background: var(--red);
  color: var(--white);
}

/* ===== Main Content ===== */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ===== Hero (Home) ===== */
.hero {
  display: flex;
  align-items: center;
  min-height: 100vh;
  padding: 0;
  border-bottom: var(--border);
  background: var(--white);
  overflow: hidden;
}

.hero-text {
  flex: 1;
  padding: 60px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 20px;
}

.hero-eyebrow {
  display: inline-block;
  padding: 4px 14px;
  background: var(--blue);
  border: var(--border);
  border-radius: var(--radius-btn);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  width: fit-content;
  box-shadow: var(--shadow-sm);
}

.hero-h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--black);
}

.hero-h1 span {
  display: block;
}

.hero-desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: #333;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.hero-media {
  flex: 0 0 45%;
  height: 100vh;
  overflow: hidden;
  border-left: var(--border);
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-media .hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media:empty::after,
.hero-media:not(:has(img))::after {
  content: '3RAT';
  font-size: 6rem;
  font-weight: 700;
  color: var(--black);
  letter-spacing: -0.05em;
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--blue);
  border: var(--border);
  border-radius: var(--radius-btn);
  color: var(--black);
  font-weight: 700;
  font-size: 0.95rem;
  min-height: 48px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.btn-primary:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--black);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-btn);
  color: var(--black);
  font-weight: 700;
  font-size: 0.95rem;
  min-height: 48px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.btn-secondary:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--black);
  background: var(--off-white);
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  background: var(--red);
  border: var(--border);
  border-radius: var(--radius-btn);
  color: var(--white);
  font-weight: 700;
  font-size: 0.9rem;
  min-height: 44px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}

.btn-accent:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--black);
}

/* ===== Main Content Layout ===== */
main {
  display: flex;
  gap: 0;
  flex: 1;
  align-items: flex-start;
}

main > div {
  flex: 1;
  min-width: 0;
  border-right: var(--border);
}

main > div > section {
  border-bottom: var(--border);
  padding: 40px 48px;
}

/* ===== Page Aside ===== */
.page-aside {
  width: 280px;
  flex-shrink: 0;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 0;
}

.aside-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding-bottom: 8px;
  border-bottom: var(--border);
  margin-bottom: 4px;
}

.aside-title span {
  display: inline;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.aside-links li a {
  display: block;
  padding: 8px 12px;
  border: 2px solid transparent;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color var(--transition), background var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-links li a:hover {
  border-color: var(--black);
  background: var(--blue);
  box-shadow: var(--shadow-sm);
}

.aside-cta {
  background: var(--off-white);
  border: var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-cta p {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--black);
}

.aside-contact-block {
  border: var(--border);
  border-radius: 12px;
  padding: 16px;
  background: var(--white);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ===== Inner Page Header / Breadcrumb ===== */
.inner-page-header {
  padding: 20px 48px;
  border-bottom: var(--border);
  background: var(--white);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: #555;
}

.breadcrumb a {
  color: var(--blue);
  font-weight: 600;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ===== Article Layouts ===== */
.article-hero,
.article-hero.feature-hero,
.article-hero.faq-hero,
.article-hero.about-hero,
.article-hero.privacy-hero {
  background: var(--white);
}

.article-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--blue);
  border: var(--border);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.feature-tag {
  background: var(--red);
  color: var(--white);
}

.faq-tag {
  background: var(--black);
  color: var(--blue);
}

.about-tag {
  background: var(--blue);
}

.privacy-tag {
  background: #e0e0d8;
  color: var(--black);
}

.article-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
}

.article-hero h1 span {
  display: inline;
}

.article-lead {
  font-size: 1.05rem;
  color: #444;
  line-height: 1.7;
  max-width: 640px;
  margin-top: 8px;
}

.page-meta {
  margin: 8px 0;
  font-size: 0.85rem;
  color: #666;
}

.pub-date {
  font-weight: 500;
}

/* ===== Article Body ===== */
.article-body {
  background: var(--white);
  font-size: 1rem;
  line-height: 1.8;
  color: #222;
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--blue);
}

.article-body h2 span {
  display: inline;
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 24px 0 12px;
}

.article-body h3 span {
  display: inline;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 16px 24px;
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.article-body strong {
  font-weight: 700;
  color: var(--black);
}

.article-body a {
  color: #0066cc;
  text-decoration: underline;
  font-weight: 500;
}

.article-body a:hover {
  color: var(--red);
}

.article-body blockquote {
  border-left: 5px solid var(--blue);
  padding: 12px 20px;
  background: #f0f8ff;
  margin: 20px 0;
  border-radius: 0 8px 8px 0;
}

/* ===== Content Section (Home) ===== */
.content-section {
  background: var(--white);
}

.section-inner {
  font-size: 1rem;
  line-height: 1.8;
  color: #222;
  max-width: 720px;
}

.section-inner h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 28px 0 14px;
  border-bottom: 3px solid var(--blue);
  padding-bottom: 6px;
}

.section-inner h2 span {
  display: inline;
}

.section-inner h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 20px 0 10px;
}

.section-inner h3 span {
  display: inline;
}

.section-inner p {
  margin-bottom: 14px;
}

.section-inner ul, .section-inner ol {
  margin: 0 0 14px 24px;
  list-style: disc;
}

.section-inner ol { list-style: decimal; }
.section-inner li { margin-bottom: 6px; }
.section-inner strong { font-weight: 700; }
.section-inner a { color: #0066cc; text-decoration: underline; }
.section-inner a:hover { color: var(--red); }

/* ===== Cards Section ===== */
.cards-section {
  background: var(--off-white);
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title span {
  display: inline;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 3px;
  background: var(--black);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--black);
}

.card-tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--blue);
  border: 2px solid var(--black);
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  width: fit-content;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
}

.card-title span {
  display: inline;
}

.card-desc {
  font-size: 0.88rem;
  color: #555;
  line-height: 1.6;
  flex: 1;
}

.card-date {
  font-size: 0.8rem;
  color: #888;
}

.card-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--off-white);
  border: var(--border);
  border-radius: var(--radius-btn);
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  width: fit-content;
  transition: background var(--transition), transform var(--transition);
}

.card-link:hover {
  background: var(--blue);
  transform: translate(-2px, -2px);
}

/* ===== Child Pages DL (Feature) ===== */
.child-section {
  background: var(--off-white);
}

.child-dl {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.child-dl dt {
  background: var(--white);
  border-bottom: 2px solid var(--black);
  padding: 0;
}

.child-dl dt a {
  display: block;
  padding: 14px 20px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--black);
  transition: background var(--transition), color var(--transition);
  min-height: 48px;
  display: flex;
  align-items: center;
}

.child-dl dt a:hover {
  background: var(--blue);
  color: var(--black);
}

.child-dl dd {
  padding: 10px 20px 16px;
  font-size: 0.9rem;
  color: #555;
  background: #fafaf8;
  border-bottom: 2px solid #e0e0d8;
  line-height: 1.6;
}

.child-dl dd:last-child {
  border-bottom: none;
}

/* ===== FAQ Specific ===== */
.faq-body {
  background: var(--white);
}

.faq-nav-section {
  background: var(--off-white);
}

.faq-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.faq-nav-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--white);
  border: var(--border);
  border-radius: 16px;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  min-height: 56px;
}

.faq-nav-card:hover {
  background: var(--blue);
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--black);
}

.faq-nav-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* ===== About Stats ===== */
.about-stats {
  background: var(--off-white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.stat-card {
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-card);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform var(--transition);
}

.stat-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 8px 8px 0 var(--black);
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--red);
  line-height: 1;
}

.stat-label {
  font-size: 0.9rem;
  color: #555;
  line-height: 1.5;
}

.stat-card a {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 14px;
  background: var(--blue);
  border: var(--border);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.stat-card a:hover {
  transform: translate(-2px, -2px);
}

/* ===== Privacy Body ===== */
.privacy-body {
  background: var(--white);
}

.privacy-body h2 {
  margin-top: 32px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--black);
  color: var(--white);
  border-top: var(--border);
}

.footer-cta-block {
  padding: 56px 48px;
  border-bottom: 3px solid #333;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--blue);
  border-bottom: var(--border);
}

.footer-cta-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--black);
  flex: 1;
  min-width: 200px;
}

.footer-cta-title span {
  display: inline;
}

.footer-cta-block p {
  color: var(--black);
  font-weight: 500;
  flex: 2;
  min-width: 200px;
  font-size: 1rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-bottom: 3px solid #333;
}

.footer-col {
  padding: 32px 36px;
  border-right: 3px solid #333;
}

.footer-col:last-child {
  border-right: none;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}

.footer-col nav dl {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-col nav dt a,
.footer-col nav dd a {
  display: flex;
  align-items: center;
  padding: 6px 0;
  color: #aaa;
  font-size: 0.88rem;
  min-height: 40px;
  transition: color var(--transition);
}

.footer-col nav dt a:hover,
.footer-col nav dd a:hover {
  color: var(--blue);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-col ul li a {
  display: flex;
  align-items: center;
  padding: 6px 0;
  color: #aaa;
  font-size: 0.88rem;
  min-height: 40px;
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: var(--blue);
}

.footer-col address {
  margin-top: 16px;
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col address a {
  display: flex;
  align-items: center;
  padding: 6px 0;
  color: #aaa;
  font-size: 0.88rem;
  min-height: 40px;
  transition: color var(--transition);
}

.footer-col address a:hover {
  color: var(--red);
}

.footer-col address p {
  color: #888;
  font-size: 0.85rem;
}

.footer-bottom {
  padding: 20px 48px;
  text-align: center;
  border-top: 3px solid #222;
}

.footer-bottom p {
  color: #666;
  font-size: 0.82rem;
}

/* ===== FAQ Article Body: DL styling ===== */
.faq-body dl {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin: 20px 0;
}

.faq-body dt {
  background: var(--black);
  color: var(--white);
  padding: 14px 20px;
  font-weight: 700;
  font-size: 1rem;
  border-bottom: 2px solid #333;
}

.faq-body dd {
  background: var(--white);
  padding: 14px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
  border-bottom: 2px solid var(--black);
  color: #333;
}

.faq-body dd:last-child {
  border-bottom: none;
}

/* ===== Carousel (Feature: meiri-gengxin placeholder) ===== */
.carousel-wrap {
  position: relative;
  overflow: hidden;
  border: var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.carousel-track {
  display: flex;
  transition: transform 0.4s ease;
}

.carousel-slide {
  min-width: 100%;
  padding: 32px;
  background: var(--white);
  border-right: var(--border);
  font-size: 1rem;
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
  .carousel-track {
    transition: none !important;
  }
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 1024px) {
  :root {
    --sidebar-w: 64px;
  }

  .sidebar-nav dt a,
  .sidebar-nav dd a {
    padding: 10px 0;
    justify-content: center;
    font-size: 0;
    gap: 0;
  }

  .sidebar-nav dt a::first-letter,
  .sidebar-nav dd a::first-letter {
    font-size: 1rem;
  }

  .nav-section-label {
    display: none;
  }

  .sidebar-brand {
    padding: 12px 8px;
  }

  .sidebar-contact {
    padding: 8px;
  }

  .contact-btn {
    font-size: 0;
    padding: 10px;
    justify-content: center;
  }

  .contact-btn::before {
    content: '✉';
    font-size: 1rem;
  }

  .hero-text {
    padding: 48px 32px;
  }

  .hero-media {
    flex: 0 0 40%;
  }

  main > div > section,
  .inner-page-header {
    padding: 32px 32px;
  }

  .page-aside {
    width: 240px;
  }

  .footer-cta-block {
    padding: 40px 32px;
  }

  .footer-col {
    padding: 24px 24px;
  }

  .footer-bottom {
    padding: 16px 24px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
  :root {
    --sidebar-w: 0px;
  }

  .sidebar {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    width: 100%;
    height: auto;
    flex-direction: row;
    border-right: none;
    border-top: var(--border);
    z-index: 200;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .sidebar-brand {
    border-bottom: none;
    border-right: 3px solid #333;
    padding: 8px 12px;
    flex-shrink: 0;
  }

  .brand-icon,
  .brand-icon-text {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .sidebar-nav {
    flex: 1;
    padding: 0;
    overflow-x: auto;
  }

  .sidebar-nav dl {
    flex-direction: row;
    gap: 0;
    padding: 0;
    white-space: nowrap;
  }

  .nav-section-label {
    display: none;
  }

  .sidebar-nav dt,
  .sidebar-nav dd {
    display: inline-block;
  }

  .sidebar-nav dt a,
  .sidebar-nav dd a {
    padding: 12px 14px;
    font-size: 0.75rem;
    border-left: none;
    border-bottom: 3px solid transparent;
    min-height: 56px;
    flex-direction: column;
    gap: 2px;
    text-align: center;
    white-space: normal;
    width: 80px;
    line-height: 1.2;
  }

  .sidebar-nav dt a:hover,
  .sidebar-nav dd a:hover,
  .sidebar-nav dd.active a,
  .sidebar-nav dt.active a {
    border-left: none;
    border-bottom-color: var(--blue);
  }

  .sidebar-contact {
    border-top: none;
    border-left: 3px solid #333;
    padding: 8px 12px;
    flex-shrink: 0;
  }

  .contact-btn {
    font-size: 0.75rem;
    padding: 8px 10px;
    min-height: 40px;
    min-width: 56px;
    writing-mode: horizontal-tb;
  }

  .main-content {
    margin-left: 0;
    padding-bottom: 80px;
  }

  .hero {
    flex-direction: column;
    min-height: auto;
    padding-top: 0;
  }

  .hero-text {
    padding: 40px 24px 28px;
    order: 2;
  }

  .hero-media {
    flex: 0 0 220px;
    height: 220px;
    width: 100%;
    order: 1;
    border-left: none;
    border-bottom: var(--border);
  }

  .hero-h1 {
    font-size: 1.6rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  main {
    flex-direction: column;
  }

  main > div {
    border-right: none;
    border-bottom: var(--border);
  }

  main > div > section {
    padding: 28px 20px;
  }

  .page-aside {
    width: 100%;
    position: static;
    padding: 24px 20px;
    border-top: var(--border);
  }

  .inner-page-header {
    padding: 16px 20px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .faq-nav-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .footer-cta-block {
    padding: 32px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .footer-cta-title {
    font-size: 1.5rem;
  }

  .footer-cols {
    grid-template-columns: 1fr;
  }

  .footer-col {
    border-right: none;
    border-bottom: 3px solid #333;
    padding: 24px 20px;
  }

  .footer-col:last-child {
    border-bottom: none;
  }

  .footer-bottom {
    padding: 16px 20px;
  }
}

/* ===== 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;
}