/* ============================================================
   KRIDHAN INFRATECH — About Us Page Styles
   Inherits: style.css variables and utilities
   ============================================================ */

/* ── 0. PAGE NAV STRIPE ──────────────────────────────────── */
.au-page-nav {
  position: sticky;
  top: 80px;
  z-index: 200;
  background: var(--bg-muted);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.au-page-nav-links {
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
}
.au-page-nav-links::-webkit-scrollbar { display: none; }
.au-page-nav-link {
  padding: 15px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-500);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color .2s, border-color .2s;
  text-decoration: none;
}
.au-page-nav-link:hover { color: var(--text-900); }
.au-page-nav-link.active { color: var(--red); border-bottom-color: var(--red); }

/* ── 1. HERO ─────────────────────────────────────────────── */
.au-hero {
  position: relative;
  min-height: 480px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.au-hero-inner {
  position: relative;
  z-index: 2;
  padding: 120px 0 80px;
  max-width: 720px;
}
.au-hero-title {
  font-size: clamp(2.2rem, 3.8vw, 3.8rem);
  font-weight: 700;
  letter-spacing: -.025em;
  color: #fff;
  line-height: 1.05;
  margin: 0 0 20px;
  text-transform: uppercase;
}
.au-hero-title em {
  font-style: normal;
  color: #fff;
}
.au-hero-desc {
  font-size: .95rem;
  color: rgba(255,255,255,.75);
  max-width: 560px;
  line-height: 1.75;
}
.au-hero-strip {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--red);
}

/* ── 2. SECTION HEADINGS PATTERN ─────────────────────────── */
.au-section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 14px;
}
.au-section-tag::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.au-section-heading {
  font-size: clamp(1.9rem, 3vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -.018em;
  text-transform: uppercase;
  color: var(--text-900);
  line-height: 1.15;
  margin-bottom: 18px;
}
.au-section-heading.light { color: #fff; }
.au-section-intro {
  font-size: 1.04rem;
  color: var(--text-500);
  line-height: 1.72;
  max-width: 640px;
}
.au-section-header { margin-bottom: 56px; }
.au-section-header.center { text-align: center; }
.au-section-header.center .au-section-intro { margin: 0 auto; }

/* ── 3. OUR STORY ────────────────────────────────────────── */
.au-story { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-white); }
.au-story-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 72px;
  align-items: start;
}
.au-story-text p {
  font-size: 1.02rem;
  color: var(--text-500);
  line-height: 1.8;
  margin-bottom: 18px;
}
.au-story-text p:last-child { margin-bottom: 0; }
.au-diff-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.au-diff-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 20px 22px;
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}
.au-diff-num {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--red);
  min-width: 24px;
  padding-top: 2px;
}
.au-diff-title {
  font-size: .92rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 4px;
}
.au-diff-desc {
  font-size: .88rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* ── 4. ENGINEERING CAPABILITIES ────────────────────────── */
.au-engineering { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-soft); }

.au-coupler-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 72px;
}
.au-coupler-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition);
}
.au-coupler-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.au-coupler-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: contain;
  padding: 20px;
  background: var(--bg-muted);
}
.au-coupler-body { padding: 18px 20px; }
.au-coupler-num {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--red);
  margin-bottom: 6px;
}
.au-coupler-name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 8px;
}
.au-coupler-desc {
  font-size: .86rem;
  color: var(--text-500);
  line-height: 1.6;
}

/* Thread specs table */
.au-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 72px;
}
.au-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.au-table thead th {
  background: var(--text-700);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  padding: 8px 12px;
  text-align: left;
  white-space: nowrap;
}
.au-table tbody td {
  padding: 7px 12px;
  color: var(--text-700);
  border-bottom: 1px solid var(--border-light);
}
.au-table tbody tr:last-child td { border-bottom: none; }
.au-table tbody tr:nth-child(even) { background: var(--bg-soft); }
.au-table tbody tr:hover { background: rgba(13,32,96,.04); }
.au-table td:first-child { font-weight: 700; color: var(--text-900); }

/* Threading process steps */
.au-process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.au-process-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
}
.au-process-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--blue);
}
.au-process-num {
  font-size: 2.8rem;
  font-weight: 900;
  color: rgba(13,32,96,.07);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: -.04em;
}
.au-process-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 10px;
}
.au-process-desc {
  font-size: .88rem;
  color: var(--text-500);
  line-height: 1.7;
}

/* ── 5. COMPLIANCE CODES (light bg) ──────────────────────── */
.au-compliance {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--bg-soft);
  position: relative;
  overflow: hidden;
}
.au-compliance-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.au-compliance-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  transition: var(--transition);
}
.au-compliance-card:hover { background: var(--bg-soft); }
.au-compliance-code {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-900);
  letter-spacing: -.01em;
  margin-bottom: 6px;
}
.au-compliance-req {
  font-size: .8rem;
  font-weight: 700;
  color: #d4a843;
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.au-compliance-detail {
  font-size: .86rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* ── 6. MANUFACTURING CAPABILITIES ──────────────────────── */
.au-manufacturing { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-white); }

/* 7-step process */
.au-mfg-process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 72px;
}
.au-mfg-step {
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: flex-start;
  padding: 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-white);
  overflow: hidden;
  transition: var(--transition);
}
.au-mfg-step:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.au-mfg-step-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}
.au-mfg-step-body {
  padding: 16px 18px;
}
.au-mfg-step-num {
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--red);
  margin-bottom: 5px;
}
.au-mfg-step-title {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 6px;
}
.au-mfg-step-desc {
  font-size: .82rem;
  color: var(--text-500);
  line-height: 1.62;
}

/* Sonic tube size cards */
.au-sizes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 72px;
}
.au-size-card {
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 26px;
  transition: var(--transition);
}
.au-size-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.au-size-code {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--blue);
  letter-spacing: -.02em;
  margin-bottom: 8px;
}
.au-size-specs {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
}
.au-size-spec {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text-500);
  background: var(--bg-muted);
  padding: 4px 10px;
  border-radius: 100px;
}
.au-size-desc {
  font-size: .88rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* Components */
.au-components-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.au-component-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-white);
  transition: var(--transition);
}
.au-component-card:hover { box-shadow: var(--shadow-md); }
.au-component-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: contain;
  background: var(--bg-soft);
  padding: 24px;
}
.au-component-body { padding: 20px 22px; }
.au-component-name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 8px;
}
.au-component-desc {
  font-size: .86rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* ── 7. AFTER SALES SERVICES ─────────────────────────────── */
.au-aftersales { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-soft); }

/* Joint prep steps */
.au-joint-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 64px;
}
.au-joint-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  transition: var(--transition);
}
.au-joint-card:hover { box-shadow: var(--shadow-sm); }
.au-joint-num {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--red);
  margin-bottom: 8px;
}
.au-joint-step {
  font-size: .94rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 8px;
}
.au-joint-desc {
  font-size: .85rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* Installation methods */
.au-install-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 64px;
}
.au-install-card {
  display: grid;
  grid-template-columns: 420px 1fr;
  align-items: start;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.au-install-img-panel {
  position: relative;
}
.au-install-img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
}
.au-install-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(0,0,0,.65) 0%, rgba(0,0,0,.08) 70%);
  display: flex;
  align-items: flex-end;
  padding: 24px 28px;
}
.au-install-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -.01em;
}
.au-install-body {
  padding: 24px 28px;
}
.au-install-steps-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.au-install-steps-count {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--red);
  letter-spacing: -.04em;
  line-height: 1;
}
.au-install-steps-text {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-500);
  border-left: 2px solid var(--border);
  padding-left: 12px;
  line-height: 1.5;
}
.au-install-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 10px;
}
.au-install-step:last-child { margin-bottom: 0; }
.au-install-step-num {
  font-size: .68rem;
  font-weight: 800;
  color: var(--text-300);
  min-width: 24px;
  padding-top: 2px;
  letter-spacing: .04em;
}
.au-install-step-text {
  font-size: .875rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* Sonic install steps (6-step grid) */
.au-sonic-install-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.au-sonic-step-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
}
.au-sonic-step-card:hover { box-shadow: var(--shadow-sm); }
.au-sonic-step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: .78rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.au-sonic-step-title {
  font-size: .92rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 8px;
}
.au-sonic-step-desc {
  font-size: .85rem;
  color: var(--text-500);
  line-height: 1.65;
}

/* ── 8. QUALITY & CERTIFICATIONS ─────────────────────────── */
.au-quality { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-white); }

.au-cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 72px;
}

/* ── CERTIFICATIONS & REGISTRATION DOCUMENTS ─────────────── */
.qc-certs-section {
  background: #fff;
  padding: 48px 0 0;
  margin-top: 56px;
}
.qc-certs-header { margin-bottom: 28px; }
.qc-certs-heading {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--text-900);
  margin: 6px 0 0;
}
/* Slider wrapper */
.qc-cert-slider-wrap {
  position: relative;
  padding: 0 40px;
}
.qc-cert-slider {
  overflow: hidden;
}
.qc-cert-track {
  display: flex;
  gap: 16px;
  transition: transform .38s cubic-bezier(.4,0,.2,1);
}
.qc-cert-card {
  flex: 0 0 calc((100% - 48px) / 4);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #fff;
  display: flex;
  flex-direction: column;
  cursor: zoom-in;
  transition: transform .18s ease, box-shadow .18s ease;
}
.qc-cert-card:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,.22); }
.qc-cert-img-wrap {
  flex: 1;
  background: #fafafa;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  min-height: 280px;
}
.qc-cert-img-wrap img { width: 100%; height: auto; object-fit: contain; display: block; }
.qc-cert-footer { padding: 12px 16px; background: var(--bg-muted); }
.qc-cert-label { font-size: .75rem; font-weight: 700; letter-spacing: .04em; color: var(--red); margin-bottom: 3px; text-transform: uppercase; }
.qc-cert-sub { font-size: .68rem; letter-spacing: .04em; color: var(--text-500); text-transform: uppercase; line-height: 1.4; }

/* Slider arrows */
.qc-cs-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-700);
  font-size: 1.4rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
  transition: background .18s, color .18s, border-color .18s;
  box-shadow: var(--shadow-sm);
}
.qc-cs-arrow:hover { background: var(--text-700); color: #fff; border-color: var(--text-700); }
.qc-cs-arrow:disabled { opacity: .35; cursor: default; pointer-events: none; }
.qc-cs-arrow--prev { left: 0; }
.qc-cs-arrow--next { right: 0; }

/* Bullet dots */
.qc-cert-bullets {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
}
.qc-cert-bullet {
  width: 8px;
  height: 8px;
  border-radius: 4px;
  border: none;
  background: var(--border);
  cursor: pointer;
  padding: 0;
  transition: background .22s, width .22s;
}
.qc-cert-bullet.active {
  background: var(--red);
  width: 28px;
}

/* Lightbox */
.cert-lb-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,.88);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: certFade .18s ease;
}
@keyframes certFade { from { opacity: 0; } to { opacity: 1; } }
.cert-lb-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: min(560px, 90vw);
  animation: certScale .18s ease;
}
@keyframes certScale { from { transform: scale(.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.cert-lb-img-wrap { position: relative; overflow: auto; max-height: 80vh; }
.cert-lb-img { width: 100%; height: auto; max-height: 78vh; object-fit: contain; border-radius: 6px; cursor: zoom-in; display: block; }
.cert-lb-img.zoomed { max-width: none; max-height: none; cursor: zoom-out; }
.cert-lb-caption { margin-top: 12px; text-align: center; }
.cert-lb-label { font-size: .85rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: #fff; }
.cert-lb-sub { font-size: .72rem; letter-spacing: .04em; color: rgba(255,255,255,.55); text-transform: uppercase; margin-top: 3px; }
.cert-lb-close {
  position: fixed; top: 20px; right: 24px;
  background: none; border: none; color: #fff;
  font-size: 22px; cursor: pointer; opacity: .7; transition: opacity .15s;
}
.cert-lb-close:hover { opacity: 1; }
.cert-lb-arrow {
  position: fixed; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: #fff;
  font-size: 56px; cursor: pointer; opacity: .5; transition: opacity .15s; user-select: none; line-height: 1;
}
.cert-lb-arrow:hover { opacity: 1; }
.cert-lb-arrow--prev { left: 8px; }
.cert-lb-arrow--next { right: 8px; }
.cert-lb-zoom-btn {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,.55); border: 1px solid rgba(255,255,255,.25);
  border-radius: 6px; color: #fff; width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background .15s;
}
.cert-lb-zoom-btn:hover { background: rgba(0,0,0,.8); }

@media (max-width: 768px) {
  .qc-certs-section { padding: 28px 0 0; }
  .qc-cert-card { flex: 0 0 calc((100% - 16px) / 2); }
  .qc-cert-img-wrap { min-height: 220px; }
}
@media (max-width: 480px) {
  .qc-cert-card { flex: 0 0 100%; }
  .qc-cert-slider-wrap { padding: 0 32px; }
}
.au-cert-card {
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}
.au-cert-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.au-cert-num {
  font-size: .72rem;
  font-weight: 800;
  color: var(--red);
  letter-spacing: .08em;
  margin-bottom: 10px;
}
.au-cert-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-900);
  margin-bottom: 10px;
}
.au-cert-desc {
  font-size: .85rem;
  color: var(--text-500);
  line-height: 1.6;
}

/* NABL tests grid */
.au-nabl-section {
  padding: 64px;
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  margin-bottom: 48px;
  position: relative;
  overflow: hidden;
}
.au-nabl-tag {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 10px;
  display: block;
}
.au-nabl-heading {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 32px;
}
.au-nabl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.au-nabl-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 22px;
}
.au-nabl-card-num {
  font-size: .72rem;
  font-weight: 800;
  color: #d4a843;
  letter-spacing: .08em;
  margin-bottom: 6px;
}
.au-nabl-card-name {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 8px;
}
.au-nabl-card-desc {
  font-size: .83rem;
  color: var(--text-500);
  line-height: 1.62;
}

/* In-house tests + traceability */
.au-inhouse-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.au-inhouse-tests {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.au-test-row {
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: border-color .2s;
}
.au-test-row.active {
  border-color: var(--red);
}
.au-test-header {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 20px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}
.au-test-num {
  font-size: .72rem;
  font-weight: 800;
  color: var(--red);
  min-width: 22px;
  flex-shrink: 0;
}
.au-test-name {
  font-size: .92rem;
  font-weight: 700;
  color: var(--text-900);
  flex: 1;
}
.au-test-chevron {
  flex-shrink: 0;
  color: var(--text-400);
  transition: transform .25s ease;
}
.au-test-row.active .au-test-chevron {
  transform: rotate(180deg);
}
.au-test-body {
  display: none;
  padding: 0 20px 18px;
}
.au-test-row.active .au-test-body {
  display: block;
}
.au-test-desc {
  font-size: .85rem;
  color: var(--text-500);
  line-height: 1.62;
  margin-bottom: 0;
}
.au-test-thumbs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.au-test-thumb-wrap {
  overflow: hidden;
  border-radius: 5px;
  border: 1px solid var(--border-light);
}
.au-test-thumb-wrap--full {
  grid-column: 1 / -1;
}
.au-test-thumb {
  width: 100%;
  /*height: 180px;*/
  object-fit: cover;
  cursor: pointer;
  display: block;
  transition: transform .25s ease, opacity .15s;
}
.au-test-thumb:hover {
  transform: scale(1.06);
  opacity: .9;
}
.au-trace-card {
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  height: 100%;
}
.au-trace-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 20px;
}
.au-trace-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.au-trace-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .88rem;
  color: var(--text-500);
  line-height: 1.5;
}
.au-trace-list li::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #d4a843;
  flex-shrink: 0;
  margin-top: 6px;
}

/* ── 9. CSL APPLICATION ──────────────────────────────────── */
.au-csl { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-soft); }
.au-csl-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: start;
}
.au-csl-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.au-csl-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  position: relative;
}
.au-csl-step:last-child { border-bottom: none; }
.au-csl-step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-size: .78rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.au-csl-step-name {
  font-size: .93rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 6px;
}
.au-csl-step-desc {
  font-size: .86rem;
  color: var(--text-500);
  line-height: 1.65;
}
.au-csl-media {}
.au-csl-img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
}
.au-csl-note {
  background: var(--blue);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}
.au-csl-note-tag {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: #d4a843;
  margin-bottom: 8px;
}
.au-csl-note-text {
  font-size: .88rem;
  color: rgba(255,255,255,.8);
  line-height: 1.7;
}

/* ── 10. VISION & MISSION ────────────────────────────────── */
.au-vm { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-white); }
.au-vm-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 380px;
  margin-bottom: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
}
.au-vm-row + .au-vm-row { margin-top: 24px; }
.au-vm-img {
  width: 100%;
  height: 100%;
  min-height: 340px;
  object-fit: cover;
  display: block;
}
.au-vm-content {
  padding: 64px 56px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.au-vm-content.dark { background: var(--text-900); }
.au-vm-content.light { background: var(--bg-soft); border: 1px solid var(--border-light); }
.au-vm-tag {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.au-vm-content.dark .au-vm-tag { color: rgba(255,255,255,.5); }
.au-vm-content.light .au-vm-tag { color: var(--red); }
.au-vm-heading {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.15;
  margin-bottom: 20px;
}
.au-vm-content.dark .au-vm-heading { color: #fff; }
.au-vm-content.light .au-vm-heading { color: var(--text-900); }
.au-vm-rule {
  width: 40px;
  height: 3px;
  border-radius: 2px;
  margin-bottom: 20px;
}
.au-vm-content.dark .au-vm-rule { background: rgba(255,255,255,.3); }
.au-vm-content.light .au-vm-rule { background: var(--red); }
.au-vm-text {
  font-size: .96rem;
  line-height: 1.78;
}
.au-vm-content.dark .au-vm-text { color: rgba(255,255,255,.78); }
.au-vm-content.light .au-vm-text { color: var(--text-500); }
.au-vm-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 12px;
}
.au-vm-list li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: .94rem; line-height: 1.65;
  color: var(--text-500);
}
.au-vm-list li::before {
  content: '';
  display: block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #d4a843;
  flex-shrink: 0;
  margin-top: 7px;
}

/* ── 11. CORE VALUES ─────────────────────────────────────── */
.au-values { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-soft); }
.au-values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}
.au-value-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.au-value-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.au-value-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(13,32,96,.07);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--blue);
  margin-bottom: 20px;
}
.au-value-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 10px;
}
.au-value-desc {
  font-size: .88rem;
  color: var(--text-500);
  line-height: 1.68;
}
.au-value-num {
  position: absolute;
  bottom: 16px;
  right: 20px;
  font-size: 3rem;
  font-weight: 900;
  color: rgba(13,32,96,.06);
  line-height: 1;
  letter-spacing: -.04em;
}

/* ── 12. MANUFACTURING FACILITIES ───────────────────────── */
.au-facilities { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-white); }
.au-facilities-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}
.au-facility-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 30px;
  background: var(--bg-soft);
  transition: var(--transition);
}
.au-facility-card:hover { box-shadow: var(--shadow-md); }
.au-facility-header {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 16px;
}
.au-facility-idx {
  font-size: 2rem;
  font-weight: 900;
  color: rgba(13,32,96,.12);
  line-height: 1;
  letter-spacing: -.04em;
}
.au-facility-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 4px;
}
.au-facility-loc {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .82rem;
  color: var(--text-500);
}
.au-facility-desc {
  font-size: .9rem;
  color: var(--text-500);
  line-height: 1.7;
  margin-bottom: 18px;
}
.au-facility-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.au-facility-tag {
  font-size: .76rem;
  font-weight: 600;
  color: var(--blue);
  background: rgba(13,32,96,.06);
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid rgba(13,32,96,.1);
}

/* ── 13. INDUSTRIES / SEGMENTS ───────────────────────────── */
.au-segments { padding: clamp(48px, 8vw, 96px) 0; background: var(--text-900); }
.au-segments-header { margin-bottom: 52px; }
.au-segments-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.au-segment-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: var(--transition);
  cursor: default;
}
.au-segment-card:hover { background: rgba(255,255,255,.11); }
.au-segment-icon {
  font-size: 1.6rem;
  color: #d4a843;
  flex-shrink: 0;
}
.au-segment-name {
  font-size: .9rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}
.au-segment-desc {
  font-size: .78rem;
  color: rgba(255,255,255,.55);
  line-height: 1.45;
}

/* ── 14. OUR EXPERTISE (summary at bottom) ───────────────── */
.au-expertise { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-soft); }
.au-expertise-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 56px;
}
.au-exp-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-white);
}
.au-exp-card-header {
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--border-light);
}
.au-exp-tag-row {
  display: flex;
  align-items: center;
  gap: 14px;
}
.au-exp-num {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--red);
  background: rgba(200,16,46,.06);
  padding: 4px 10px;
  border-radius: 100px;
}
.au-exp-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-900);
}
.au-exp-stats {
  display: flex;
  gap: 28px;
  flex-shrink: 0;
}
.au-exp-stat-num {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 2px;
}
.au-exp-stat-label {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-300);
}
.au-exp-body { padding: 24px 32px 28px; }
.au-exp-summary {
  font-size: .95rem;
  color: var(--text-700);
  line-height: 1.72;
  margin-bottom: 18px;
}
.au-exp-details {
  list-style: none;
  padding: 0; margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
}
.au-exp-details li {
  font-size: .86rem;
  color: var(--text-500);
  line-height: 1.6;
  padding-left: 14px;
  position: relative;
}
.au-exp-details li::before {
  content: '';
  position: absolute;
  left: 0; top: 8px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--red);
}

/* ── TAB PANEL ────────────────────────────────────────────── */
.au-tabs-section { padding: clamp(48px, 8vw, 96px) 0; background: var(--bg-white); }

/* Stats row */
.au-tov-stats {
  /* display: flex; */
  display: none;
  gap: 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 40px;
  background: var(--bg-soft);
}
.au-tov-stat {
  flex: 1;
  padding: 20px 24px;
  border-right: 1px solid var(--border-light);
  text-align: center;
}
.au-tov-stat:last-child { border-right: none; }
.au-tov-stat-num {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-900);
  letter-spacing: -.02em;
  line-height: 1;
  margin-bottom: 5px;
}
.au-tov-stat-label {
  font-size: .68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-500);
}

/* Overview grid */
.au-tab-overview {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 56px;
}
.au-tov-heading {
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text-900);
  line-height: 1.2;
  margin: 10px 0 16px;
}
.au-tov-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.au-tov-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-700);
}
.au-tov-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
  flex-shrink: 0;
}
.au-tab-overview-img {
  width: 100%;
  height: 100%;
  min-height: 240px;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  display: block;
}
@media (max-width: 768px) {
  .au-tov-stats { flex-wrap: wrap; }
  .au-tov-stat { flex: 1 1 45%; border-bottom: 1px solid var(--border-light); }
  .au-tab-overview { grid-template-columns: 1fr; }
  .au-tab-overview-img { display: none; }
}
.au-tab-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 4px;
  background: var(--bg-muted);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto 56px;
}
.au-tab-nav::-webkit-scrollbar { display: none; }
.au-tab-btn {
  padding: 10px 22px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--text-500);
  background: none;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  white-space: nowrap;
  transition: color .2s, background .2s, box-shadow .2s;
  text-transform: uppercase;
  flex-shrink: 0;
}
.au-tab-btn:hover {
  color: var(--text-900);
  background: rgba(0,0,0,.04);
}
.au-tab-btn.active {
  color: #fff;
  background: var(--text-700);
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
.au-tab-panel { display: none; }
.au-tab-panel.active { display: block; }

/* ── 15. CTA ─────────────────────────────────────────────── */
.au-cta {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--text-900);
  text-align: center;
}
.au-cta-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -.02em;
  margin-bottom: 18px;
}
.au-cta-desc {
  font-size: 1.04rem;
  color: rgba(255,255,255,.65);
  max-width: 580px;
  margin: 0 auto 36px;
  line-height: 1.72;
}

.au-compliance-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 0;
}
@media (max-width: 480px) {
  .au-compliance-header { gap: 16px; }
}

/* ── 16. RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 1024px) {
  .au-coupler-grid { grid-template-columns: repeat(2, 1fr); }
  .au-process-grid { grid-template-columns: repeat(2, 1fr); }
  .au-mfg-process { grid-template-columns: repeat(2, 1fr); }
  .au-sizes-grid { grid-template-columns: repeat(2, 1fr); }
  .au-components-grid { grid-template-columns: repeat(2, 1fr); }
  .au-joint-grid { grid-template-columns: repeat(2, 1fr); }
  .au-sonic-install-grid { grid-template-columns: repeat(2, 1fr); }
  .au-values-grid { grid-template-columns: repeat(2, 1fr); }
  .au-compliance-grid { grid-template-columns: repeat(2, 1fr); }
  .au-cert-grid { grid-template-columns: repeat(2, 1fr); }
  .au-nabl-grid { grid-template-columns: repeat(2, 1fr); }
  .au-segments-grid { grid-template-columns: repeat(2, 1fr); }
  .au-tab-overview { gap: 36px; }
  .au-inhouse-wrap { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 991px) {
  .au-vm-row { grid-template-columns: 1fr; min-height: auto; }
  .au-vm-row .au-vm-img { order: -1; min-height: 260px; }
  .au-vm-content { padding: 40px 28px; }
  .au-install-card { grid-template-columns: 1fr; }
  .au-install-img { height: 260px; }
}

@media (max-width: 768px) {
  .au-story-grid { grid-template-columns: 1fr; gap: 40px; }
  .au-coupler-grid { grid-template-columns: 1fr 1fr; }
  .au-mfg-process { grid-template-columns: 1fr; }
  .au-sizes-grid { grid-template-columns: 1fr; }
  .au-components-grid { grid-template-columns: 1fr; }
  .au-joint-grid { grid-template-columns: 1fr 1fr; }
  .au-sonic-install-grid { grid-template-columns: 1fr 1fr; }
  .au-install-card { grid-template-columns: 1fr; }
  .au-install-img { height: 220px; }
  .au-install-img-overlay { background: linear-gradient(to top, rgba(0,0,0,.7) 0%, rgba(0,0,0,.1) 60%); }
  .au-cert-grid { grid-template-columns: 1fr 1fr; }
  .au-nabl-grid { grid-template-columns: 1fr; }
  .au-nabl-section { padding: 36px 28px; }
  .au-inhouse-wrap { grid-template-columns: 1fr; }
  .au-csl-grid { grid-template-columns: 1fr; }
  .au-values-grid { grid-template-columns: 1fr 1fr; }
  .au-facilities-grid { grid-template-columns: 1fr; }
  .au-segments-grid { grid-template-columns: 1fr 1fr; }
  .au-exp-card-header { flex-direction: column; align-items: flex-start; }
  .au-exp-details { grid-template-columns: 1fr; }
  .au-process-grid { grid-template-columns: 1fr; }
  .au-compliance-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .au-hero { min-height: 340px; }
  .au-hero-title { font-size: clamp(2rem, 9vw, 2.8rem); }
  .au-coupler-grid { grid-template-columns: 1fr; }
  .au-joint-grid { grid-template-columns: 1fr; }
  .au-sonic-install-grid { grid-template-columns: 1fr; }
  .au-cert-grid { grid-template-columns: 1fr; }
  .au-values-grid { grid-template-columns: 1fr; }
  .au-segments-grid { grid-template-columns: 1fr; }
  .au-exp-stats { display: none; }
  .au-page-nav-link { padding: 12px; font-size: .7rem; }
  .au-tab-btn { padding: 8px 12px; font-size: .72rem; }
  .au-vm-content { padding: 28px 20px; }
  .au-section-heading { font-size: clamp(1.5rem, 6vw, 1.9rem); }
}