#overview {
  padding: 6rem 0 5rem;
  background: white;
}

.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

/* Image side */
.overview-img-wrap { position: relative; }
.overview-img-wrap img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
  aspect-ratio: 4/3;
}

/* Floating capacity badge */
.overview-badge {
  position: absolute;
  top: -1rem;
  right: -1rem;
  background: var(--red);
  color: white;
  border-radius: var(--radius-md);
  padding: 1.2rem 1.4rem;
  text-align: center;
  box-shadow: var(--shadow-red);
}
.overview-badge-num {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1;
}
.overview-badge-label {
  font-family: var(--font-heading);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-top: 0.2rem;
}

/* Certification pills */
.overview-cert-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 2rem;
}
.cert-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.38rem 0.85rem;
  background: rgba(21,73,155,0.07);
  border: 1px solid rgba(21,73,155,0.15);
  border-radius: 100px;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--deep-blue);
}
.cert-pill .cert-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
  flex-shrink: 0;
}

/* Feature highlights 2×2 grid */
.overview-highlights {
  display: grid;
  /* grid-template-columns: 1fr 1fr; */
   grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}
.ov-highlight {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.1rem;
  background: var(--light-grey);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--red);
  transition: transform var(--transition), box-shadow var(--transition);
}
.ov-highlight:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.ov-highlight-icon { font-size: 1.3rem; flex-shrink: 0; }
.ov-highlight-text h5 {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--deep-blue);
  margin-bottom: 0.2rem;
}
.ov-highlight-text p { font-size: 0.78rem; color: var(--mid); line-height: 1.5; }


/* ============================================================
   4. TRANSFORMER RANGE
   ============================================================ */
#range {
  padding: 6rem 0;
  background: var(--light-grey);
}

.range-header { text-align: center; margin-bottom: 4rem; }
.range-header .section-subtext { margin: 0 auto; }

.range-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.8rem;
}

.range-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.range-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(210,37,46,0.18);
}

/* Card image */
.range-card-img {
  width: 100%;
  height: 350px;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f3f8, #e4eaf5);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.range-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0rem;
  transition: transform 0.55s cubic-bezier(0.22,1,0.36,1);
}
.range-card:hover .range-card-img img { transform: scale(1.06); }

.range-card-badge {
  position: absolute;
  top: 0.85rem;
  left: 0.85rem;
  background: var(--deep-blue);
  color: white;
  font-family: var(--font-heading);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.28rem 0.65rem;
  border-radius: 4px;
}

/* Card body */
.range-card-body {
  padding: 1.6rem 1.8rem 1.8rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.range-card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--deep-blue);
  line-height: 1.2;
  margin-bottom: 0.7rem;
}

/* Animated red underline on hover */
.range-card-divider {
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red), transparent);
  border-radius: 2px;
  margin: 0.9rem 0;
  transition: width 0.55s cubic-bezier(0.22,1,0.36,1);
  display: none;
}
.range-card:hover .range-card-divider { width: 60px; }

.range-card-desc {
  font-size: 0.86rem;
  line-height: 1.7;
  color: #5a6175;
  flex: 1;
}

/* Spec chips */
.range-card-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.1rem;
}
.range-spec-chip {
  padding: 0.28rem 0.7rem;
  background: rgba(15,46,99,0.07);
  border-radius: 100px;
  font-family: var(--font-heading);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--deep-blue);
}

/* Card footer link */
.range-card-footer {
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 0px solid var(--border);
}
.range-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--red);
  transition: gap var(--transition);
}
.range-card-link svg { width: 14px; height: 14px; flex-shrink: 0; }
.range-card-link:hover { gap: 0.65rem; }


/* ============================================================
   5. TECHNICAL SPECIFICATIONS
   ============================================================ */
#specs {
  padding: 6rem 0;
  background: white;
}

.specs-header { margin-bottom: 3rem; }

/* Tab buttons */
.specs-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.spec-tab-btn {
  padding: 0.65rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  background: var(--light-grey);
  color: var(--mid);
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.spec-tab-btn:hover {
  color: var(--deep-blue);
  background: white;
  border-color: var(--border);
}
.spec-tab-btn.active {
  background: var(--deep-blue);
  color: white;
  border-color: var(--deep-blue);
  box-shadow: var(--shadow-blue);
}

/* Panels */
.spec-panel { display: none; }
.spec-panel.active {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  align-items: start;
}

.spec-left { display: flex; flex-direction: column; gap: 2rem; }

.spec-product-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  object-fit: contain;
  background: #f0f3f8;
  padding: 1.5rem;
  aspect-ratio: 1;
}

/* Feature checklist */
.spec-features h4 {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 0.9rem;
}
.spec-feature-list { display: flex; flex-direction: column; gap: 0.55rem; }
.spec-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.87rem;
  color: var(--mid);
  line-height: 1.6;
}
.spec-feature-item::before {
  content: '✓';
  color: var(--red);
  font-weight: 800;
  font-size: 0.8rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* Parameter table */
.spec-table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.spec-table-head {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  background: var(--deep-blue);
  color: white;
  padding: 0.85rem 1.2rem;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.spec-table-row {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  padding: 0.85rem 1.2rem;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.spec-table-row:last-child { border-bottom: none; }
.spec-table-row:hover      { background: var(--light-grey); }
.spec-param {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--dark);
}
.spec-value { font-size: 0.83rem; color: var(--mid); line-height: 1.5; }


/* ============================================================
   6. WHY CHOOSE TRINITY
   ============================================================ */
#why-transformers {
  padding: 6rem 0;
  background: var(--deep-blue);
  position: relative;
  overflow: hidden;
}
#why-transformers::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 10% 50%, rgba(63,111,198,0.25) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 90% 30%, rgba(210,37,46,0.15) 0%, transparent 70%);
}

.why-t-header {
  text-align: center;
  margin-bottom: 3.5rem;
  position: relative;
  z-index: 1;
}

.why-t-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

.why-t-card {
  background: rgba(255,255,255,0.055);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 2rem 1.6rem;
  position: relative;
  overflow: hidden;
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}
/* Red bottom accent bar */
.why-t-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.why-t-card:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.18);
  transform: translateY(-5px);
}
.why-t-card:hover::before { transform: scaleX(1); }

.why-t-icon  { font-size: 2rem; margin-bottom: 1.1rem; }
.why-t-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
  margin-bottom: 0.7rem;
  line-height: 1.2;
}
.why-t-desc  { font-size: 0.86rem; color: rgba(255,255,255,0.62); line-height: 1.7; }


/* ============================================================
   7. EDUCATION — What is a Transformer?
   ============================================================ */
#education {
  padding: 6rem 0;
  background: var(--light-grey);
}

.edu-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 5rem;
  align-items: center;
}

/* Diagram card */
.edu-visual {
  background: white;
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}
.edu-visual-label {
  font-family: var(--font-heading);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
  text-align: center;
  margin-bottom: 1.8rem;
}

.edu-diagram {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.edu-side { text-align: center; flex: 1; }
.edu-side-label {
  font-family: var(--font-heading);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 0.8rem;
}
.edu-voltage {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--deep-blue);
  line-height: 1;
}
.edu-voltage.high { color: var(--red); }
.edu-winding-label { margin-top: 0.5rem; font-size: 0.75rem; color: var(--mid); }

.edu-coil-wrap { flex: 2; display: flex; flex-direction: column; align-items: center; gap: 0.4rem; }
.edu-core {
  width: 100%;
  background: linear-gradient(180deg, var(--deep-blue) 0%, var(--soft-blue) 100%);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1rem;
  text-align: center;
}
.edu-core-label {
  font-family: var(--font-heading);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.75);
}
.edu-arrow { font-size: 1.4rem; color: var(--red); font-weight: 900; }

/* Key points */
.edu-points { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 0.7rem; }
.edu-point  { display: flex; align-items: center; gap: 0.65rem; font-size: 0.85rem; color: var(--mid); }
.edu-point .ep-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--red); flex-shrink: 0; }

/* Facts grid */
.edu-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}
.edu-fact {
  background: white;
  border-radius: var(--radius-md);
  padding: 1.2rem;
  text-align: center;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}
.edu-fact:hover { transform: translateY(-3px); }
.edu-fact-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--deep-blue);
  line-height: 1;
}
.edu-fact-label { font-size: 0.78rem; color: var(--mid); margin-top: 0.3rem; line-height: 1.4; }


/* ============================================================
   8. CTA BAND
   ============================================================ */
#cta {
  padding: 5.5rem 0;
  background: linear-gradient(135deg, var(--red) 0%, #8b0000 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

/* Tablet — ≤ 1024px */
@media (max-width: 1024px) {
  .overview-grid          { grid-template-columns: 1fr; gap: 3rem; }
  .overview-badge         { top: auto; bottom: -1rem; right: 1rem; }
  .range-grid             { grid-template-columns: repeat(2, 1fr); }
  .spec-panel.active      { grid-template-columns: 1fr; }
  .why-t-grid             { grid-template-columns: repeat(2, 1fr); }
  .edu-grid               { grid-template-columns: 1fr; gap: 3rem; }
}

/* Mobile — ≤ 768px */
@media (max-width: 768px) {
  /* Hero */
  #hero                   { min-height: 400px; }
  .hero-headline          { font-size: 2.2rem; line-height: 1; }
  .hero-sub               { font-size: 0.9rem; }
  .hero-actions           { flex-direction: column; }
  .hero-actions .btn      { width: 100%; justify-content: center; }

  /* Overview */
  .overview-highlights    { grid-template-columns: 1fr; }
  .overview-badge         { position: static; display: inline-block; margin-top: 1rem; }

  /* Range */
  .range-grid             { grid-template-columns: 1fr; }
  .range-card-img         { height: 180px; }

  /* Specs */
  .specs-tabs             { flex-direction: column; }
  .spec-tab-btn           { width: 100%; text-align: left; }
  .spec-table-head,
  .spec-table-row         { grid-template-columns: 1fr; gap: 0.2rem; padding: 0.7rem 1rem; }
  .spec-table-head span:last-child,
  .spec-value             { padding-left: 0.6rem; }

  /* Why */
  .why-t-grid             { grid-template-columns: 1fr; }

  /* Education */
  .edu-diagram            { flex-direction: column; align-items: stretch; }
  .edu-arrow              { text-align: center; transform: rotate(90deg); }
  .edu-facts              { grid-template-columns: 1fr 1fr; }

  /* CTA */
  .cta-actions            { flex-direction: column; align-items: center; }
}

/* Small mobile — ≤ 480px */
@media (max-width: 480px) {
  #overview,
  #range,
  #specs,
  #why-transformers,
  #education,
  #cta                    { padding: 4rem 0; }

  .range-header,
  .specs-header,
  .why-t-header           { margin-bottom: 2.5rem; }

  .edu-facts              { grid-template-columns: 1fr; }
  .overview-cert-pills    { gap: 0.4rem; }
}