:root {
  --navy-950: #0b1120;
  --navy-900: #0f172a;
  --navy-800: #1e293b;
  --navy-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --amber-600: #d97706;
  --amber-500: #f59e0b;
  --amber-100: #fef3c7;
  --amber-50: #fffbeb;
  --orange-600: #ea580c;
  --green-600: #16a34a;
  --green-50: #f0fdf4;
  --wa-green: #25D366;
  --wa-dark: #1ebe5d;
  --white: #ffffff;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.07);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 40px rgba(15, 23, 42, 0.14);
  --container: 1300px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--navy-900);
  background: var(--slate-50);
  line-height: 1.62;
  font-size: 16px;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color .18s ease, background .18s ease, border-color .18s ease; }
button, input, select, textarea { font: inherit; }
code, .sku-chip { font-family: 'Cascadia Code', Consolas, 'Courier New', monospace; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.section { padding: 56px 0; }
.section-sm { padding: 36px 0; }
.bg-white { background: var(--white); }
.bg-dark { background: var(--navy-900); color: var(--white); }
.bg-slate { background: var(--slate-100); }

/* Üst Bilgi Barı (Tek Satır Sabit) */
.topbar {
  background: var(--navy-950);
  color: #cbd5e1;
  font-size: 12.5px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 7px 0;
  flex-wrap: nowrap;
  white-space: nowrap;
}
.topbar-badges, .topbar-contacts { display: flex; align-items: center; gap: 16px; flex-wrap: nowrap; white-space: nowrap; }
.topbar-item { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.topbar-item svg { color: var(--amber-500); flex-shrink: 0; }
.topbar a:hover { color: var(--amber-500); }

/* Ana Header & Navigasyon (Kesin Tek Satır Mimari) */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--slate-200);
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.04);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  gap: 12px;
  min-height: 72px;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--navy-900);
  flex-shrink: 0;
  white-space: nowrap;
}
.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-800) 100%);
  border: 2px solid var(--amber-500);
  color: var(--amber-500);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.brand-text-wrap { display: flex; flex-direction: column; line-height: 1.18; white-space: nowrap; }
.brand-title { font-size: 17px; letter-spacing: -0.02em; white-space: nowrap; }
.brand-sub { font-size: 11px; font-weight: 600; color: var(--slate-500); letter-spacing: 0.01em; white-space: nowrap; }

.desktop-nav { display: flex; align-items: center; flex-wrap: nowrap; gap: 2px; white-space: nowrap; }
.nav-link {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--navy-800);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-link:hover { background: var(--slate-100); color: var(--orange-600); }

.nav-dropdown { position: relative; flex-shrink: 0; }
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 310px;
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all .18s ease;
  z-index: 950;
  white-space: normal;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  font-size: 13.8px;
  font-weight: 600;
  color: var(--navy-800);
}
.dropdown-item:hover { background: var(--amber-50); color: var(--orange-600); }
.dropdown-count {
  font-size: 11.5px;
  background: var(--slate-100);
  color: var(--slate-600);
  padding: 2px 7px;
  border-radius: 99px;
  flex-shrink: 0;
}

.header-actions { display: flex; align-items: center; flex-wrap: nowrap; gap: 8px; flex-shrink: 0; white-space: nowrap; }
.basket-trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--slate-100);
  border: 1px solid var(--slate-200);
  color: var(--navy-900);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 13.2px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}
.basket-trigger:hover { border-color: var(--amber-500); background: var(--amber-50); }
.basket-badge {
  background: var(--orange-600);
  color: var(--white);
  font-size: 11.5px;
  font-weight: 800;
  min-width: 20px;
  height: 20px;
  border-radius: 99px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
}

/* Butonlar */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 14.5px;
  border: 1px solid transparent;
  cursor: pointer;
  line-height: 1.25;
  text-align: center;
  white-space: nowrap;
}
.btn-sm { padding: 8px 13px; font-size: 13px; }
.btn-lg { padding: 14px 24px; font-size: 15.5px; }
.btn-amber { background: var(--orange-600); color: var(--white); }
.btn-amber:hover { background: #c2410c; color: var(--white); }
.btn-navy { background: var(--navy-900); color: var(--white); }
.btn-navy:hover { background: var(--navy-800); color: var(--white); }
.btn-wa { background: var(--wa-green); color: #052e16; font-weight: 800; }
.btn-wa:hover { background: var(--wa-dark); color: var(--white); }
.btn-outline { background: var(--white); border-color: var(--slate-200); color: var(--navy-800); }
.btn-outline:hover { border-color: var(--navy-800); background: var(--slate-50); }
.btn-ghost-light { background: rgba(255,255,255,0.09); border-color: rgba(255,255,255,0.22); color: var(--white); }
.btn-ghost-light:hover { background: rgba(255,255,255,0.18); }

/* Kural 9-11: Mobil Sağdan Kayan Off-Canvas Menü */
.mobile-menu-btn {
  display: none;
  background: var(--navy-900);
  color: var(--white);
  border: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.offcanvas-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 17, 32, 0.65);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition: opacity .26s ease, visibility .26s ease;
}
.offcanvas-backdrop.is-open { opacity: 1; visibility: visible; }
.offcanvas-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 82%;
  max-width: 320px;
  background: var(--navy-900);
  color: var(--white);
  z-index: 1150;
  transform: translateX(100%);
  transition: transform .28s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  box-shadow: -10px 0 30px rgba(0,0,0,0.35);
}
.offcanvas-panel.is-open { transform: translateX(0); }
.offcanvas-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.offcanvas-close {
  background: rgba(255,255,255,0.1);
  color: var(--white);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.offcanvas-body { padding: 14px 18px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.offcanvas-group-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--amber-500);
  margin: 12px 0 4px;
  font-weight: 700;
}
.offcanvas-link {
  padding: 10px 12px;
  border-radius: 6px;
  color: #e2e8f0;
  font-size: 14.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.03);
}
.offcanvas-link:hover { background: rgba(255,255,255,0.1); color: var(--amber-500); }
.offcanvas-foot {
  padding: 16px 18px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: grid;
  gap: 10px;
}

/* Teklif Sepeti Çekmecesi (Quote Basket Drawer) */
.basket-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 92%;
  max-width: 430px;
  background: var(--white);
  z-index: 1200;
  transform: translateX(100%);
  transition: transform .28s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
  flex-direction: column;
  box-shadow: -12px 0 36px rgba(15,23,42,0.22);
}
.basket-drawer.is-open { transform: translateX(0); }
.basket-head {
  padding: 18px 20px;
  background: var(--navy-900);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.basket-items { padding: 16px 20px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 12px; }
.basket-row {
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--slate-50);
}
.basket-row img { width: 56px; height: 56px; object-fit: contain; background: var(--white); border-radius: 6px; padding: 4px; border: 1px solid var(--slate-200); }
.basket-qty { display: inline-flex; align-items: center; gap: 6px; margin-top: 6px; }
.basket-qty button {
  width: 26px; height: 26px; border: 1px solid var(--slate-200); background: var(--white);
  border-radius: 4px; font-weight: 700; cursor: pointer;
}
.basket-foot {
  padding: 16px 20px;
  border-top: 1px solid var(--slate-200);
  background: var(--slate-50);
  display: grid;
  gap: 10px;
}

/* Breadcrumb */
.breadcrumb-bar {
  background: var(--white);
  border-bottom: 1px solid var(--slate-200);
  padding: 10px 0;
  font-size: 13px;
  color: var(--slate-500);
}
.breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb-list a:hover { color: var(--orange-600); text-decoration: underline; }
.breadcrumb-current { color: var(--navy-900); font-weight: 600; }

/* Hero Alanları */
.hero {
  background: radial-gradient(circle at 85% 20%, rgba(234, 88, 12, 0.18), transparent 45%),
              linear-gradient(135deg, var(--navy-950) 0%, var(--navy-900) 60%, var(--navy-800) 100%);
  color: var(--white);
  padding: 58px 0 64px;
  border-bottom: 3px solid var(--amber-500);
}
.hero-compact { padding: 40px 0 44px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(245, 158, 11, 0.16);
  border: 1px solid rgba(245, 158, 11, 0.42);
  color: #fcd34d;
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 12.5px;
  font-weight: 700;
  margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(27px, 3.6vw, 42px);
  line-height: 1.18;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}
.hero p.lead {
  font-size: 16.5px;
  color: #cbd5e1;
  margin: 0 0 24px;
  max-width: 68ch;
}
.hero-cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.stat-box {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 13px 14px;
}
.stat-num { font-size: 21px; font-weight: 800; color: var(--amber-500); line-height: 1.15; }
.stat-lbl { font-size: 12px; color: #cbd5e1; margin-top: 3px; }

.hero-panel {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-lg);
  padding: 22px;
}

/* Bölüm Başlıkları */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.section-head h2 {
  font-size: clamp(22px, 2.5vw, 30px);
  margin: 0 0 6px;
  letter-spacing: -0.015em;
}
.section-head p { margin: 0; color: var(--slate-600); max-width: 68ch; }

/* Kart Izgaraları */
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }

.card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

/* Ürün Serisi Kartı */
.product-card { padding: 0; overflow: hidden; }
.product-card-media {
  position: relative;
  height: 215px;
  background: var(--white);
  border-bottom: 1px solid var(--slate-100);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.product-card-media img { max-height: 185px; width: auto; object-fit: contain; }
.card-std-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--navy-900);
  color: var(--white);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
}
.card-var-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--amber-100);
  color: #92400e;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
}
.product-card-body { padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.product-card-cat { font-size: 12px; color: var(--slate-500); font-weight: 600; margin-bottom: 4px; }
.product-card-title { font-size: 16.5px; font-weight: 800; margin: 0 0 10px; line-height: 1.3; color: var(--navy-900); }
.product-card-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
  font-size: 12px;
}
.spec-pill {
  background: var(--slate-100);
  color: var(--navy-800);
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.product-card-foot {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--slate-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.price-tag { font-size: 17px; font-weight: 800; color: var(--navy-900); }
.price-sub { font-size: 11px; color: var(--slate-500); display: block; font-weight: 600; }
.quote-tag { font-size: 14px; font-weight: 800; color: var(--orange-600); }

/* Hızlı Bilgi Kartı (Quick Info) */
.quick-info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 22px 0;
}
.quick-info-item {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-left: 4px solid var(--amber-500);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
}
.quick-info-label { font-size: 12px; color: var(--slate-500); font-weight: 600; }
.quick-info-val { font-size: 15px; font-weight: 800; color: var(--navy-900); margin-top: 2px; }

/* Ürün Detay (16 Bölüm) Üst Sahne */
.product-stage {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 32px;
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.gallery-main {
  height: 410px;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: var(--white);
}
.gallery-main img { max-height: 374px; width: auto; object-fit: contain; }
.gallery-thumbs {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.gallery-thumb {
  width: 68px;
  height: 68px;
  border: 2px solid var(--slate-200);
  border-radius: var(--radius-sm);
  padding: 4px;
  background: var(--white);
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.gallery-thumb.is-active { border-color: var(--orange-600); }
.gallery-thumb img { max-height: 56px; object-fit: contain; }

.variant-pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.variant-pill {
  padding: 8px 12px;
  border: 1.5px solid var(--slate-200);
  background: var(--slate-50);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  color: var(--navy-800);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}
.variant-pill:hover { border-color: var(--amber-500); }
.variant-pill.is-active {
  border-color: var(--orange-600);
  background: var(--amber-50);
  color: var(--navy-900);
  box-shadow: 0 0 0 2px rgba(234,88,12,0.12);
}
.variant-pill small { font-size: 11px; color: var(--slate-500); font-weight: 600; }

.price-box {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin: 16px 0;
}
.live-price-big { font-size: 30px; font-weight: 900; color: var(--navy-900); line-height: 1.1; }
.vat-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--green-600);
  background: var(--green-50);
  border: 1px solid #bbf7d0;
  padding: 3px 8px;
  border-radius: 4px;
  margin-left: 8px;
}

/* Mühendislik Tabloları */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  background: var(--white);
}
.eng-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}
.eng-table th {
  background: var(--navy-900);
  color: var(--white);
  font-weight: 700;
  text-align: left;
  padding: 12px 14px;
  border-bottom: 2px solid var(--amber-500);
  font-size: 13px;
}
.eng-table th.picto-th {
  background: var(--slate-100);
  color: var(--navy-900);
  text-align: center;
  vertical-align: bottom;
}
.eng-table th.picto-th img { height: 52px; width: auto; margin: 0 auto 6px; }
.eng-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--slate-200);
  vertical-align: middle;
}
.eng-table tbody tr:hover { background: var(--amber-50); }
.eng-table tbody tr.is-selected-row { background: #ffedd5; font-weight: 700; }

/* Akıllı Hesaplayıcı Widget */
.calc-box {
  background: var(--white);
  border: 2px solid var(--navy-900);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.calc-header {
  background: var(--navy-900);
  color: var(--white);
  padding: 20px 24px;
  border-bottom: 3px solid var(--amber-500);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.calc-body { padding: 24px; }
.calc-controls {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  align-items: end;
}
.field-group { display: flex; flex-direction: column; gap: 6px; }
.field-group label { font-size: 13px; font-weight: 700; color: var(--navy-800); }
.field-control {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--navy-900);
  font-weight: 600;
}
.field-control:focus { outline: none; border-color: var(--orange-600); }
.calc-results-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}
.calc-res-card {
  border: 1.5px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 16px;
  background: var(--slate-50);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.calc-res-card.best-match { border-color: var(--orange-600); background: var(--amber-50); }

/* İçindekiler (TOC) & Rehber Düzeni */
.article-layout {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 32px;
  align-items: start;
}
.toc-card {
  position: sticky;
  top: 94px;
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 18px;
}
.toc-list { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 8px; font-size: 13.8px; }
.toc-list a { color: var(--slate-600); font-weight: 600; display: block; padding: 5px 8px; border-radius: 5px; }
.toc-list a:hover { background: var(--amber-50); color: var(--orange-600); }

/* SSS Akordiyon */
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 20px;
  font-weight: 700;
  font-size: 15.5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item[open] summary { border-bottom: 1px solid var(--slate-100); color: var(--orange-600); }
.faq-answer { padding: 16px 20px; color: var(--slate-600); font-size: 14.8px; }

/* Footer */
.site-footer {
  background: var(--navy-950);
  color: #cbd5e1;
  padding: 56px 0 28px;
  border-top: 4px solid var(--amber-500);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 32px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.09);
}
.footer-title { color: var(--white); font-size: 15px; font-weight: 800; margin: 0 0 14px; }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; font-size: 13.8px; }
.footer-links a:hover { color: var(--amber-500); }
.footer-bottom {
  padding-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  color: var(--slate-400);
}

/* Kural 12-15: Sol-Alt Yukarı Çık & Sağ-Alt Pulse WhatsApp */
.scroll-top-btn {
  position: fixed;
  left: 20px;
  bottom: 20px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--navy-900);
  color: var(--amber-500);
  border: 2px solid var(--amber-500);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 980;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all .22s ease;
  box-shadow: var(--shadow-md);
}
.scroll-top-btn.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-top-btn:hover { background: var(--orange-600); color: var(--white); border-color: var(--orange-600); }

@keyframes waPulse {
  0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.62); }
  70% { box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}
.floating-wa-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: var(--wa-green);
  color: #052e16;
  height: 54px;
  padding: 0 18px;
  border-radius: 99px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  font-size: 14px;
  z-index: 980;
  animation: waPulse 2.4s infinite;
  box-shadow: 0 8px 24px rgba(22, 163, 74, 0.35);
}
.floating-wa-btn:hover { background: var(--wa-dark); color: var(--white); }

/* Yazdırılabilir Teknik Föy (@media print) */
.print-only-header { display: none; }
@media print {
  .topbar, .site-header, .breadcrumb-bar, .floating-wa-btn, .scroll-top-btn,
  .offcanvas-panel, .offcanvas-backdrop, .basket-drawer, .no-print, .site-footer {
    display: none !important;
  }
  body { background: #fff !important; color: #000 !important; font-size: 12pt; }
  .print-only-header {
    display: flex !important;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #0f172a;
    padding-bottom: 12px;
    margin-bottom: 18px;
  }
  .product-stage, .card, .table-wrap { border: 1px solid #cbd5e1 !important; box-shadow: none !important; break-inside: avoid; }
  .eng-table th { background: #e2e8f0 !important; color: #000 !important; }
}

/* Orta Ekran / Laptop Tek Satır Menü Uyumu & Mobil Uyumluluk */
@media (max-width: 1220px) {
  .topbar-badges .topbar-item:nth-child(2) { display: none; }
  .nav-link { padding: 7px 7px; font-size: 13.2px; gap: 3px; }
  .brand-title { font-size: 16px; }
  .brand-sub { font-size: 10.5px; }
  .basket-trigger { padding: 7px 10px; font-size: 12.6px; }
  .header-call-btn { padding: 7px 10px; font-size: 12.6px; }
}
@media (max-width: 1060px) {
  .desktop-nav { display: none; }
  .mobile-menu-btn { display: inline-flex; }
  .hero-grid, .product-stage, .article-layout { grid-template-columns: 1fr; }
  .toc-card { position: static; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3, .calc-results-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calc-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  .topbar-badges { display: none; }
  .topbar-contacts .topbar-item:first-child { display: none; }
  .topbar-inner { justify-content: center; }
  .hero { padding: 36px 0 42px; }
  .hero-stats, .quick-info-grid, .grid-3, .grid-2, .grid-4,
  .calc-controls, .calc-results-grid, .footer-grid {
    grid-template-columns: 1fr;
  }
  .gallery-main { height: 280px; }
  .gallery-main img { max-height: 250px; }
  .floating-wa-btn span.wa-label { display: none; }
  .floating-wa-btn { width: 54px; padding: 0; justify-content: center; }
  .header-call-btn { display: none; }
}