/* ==========================================================================
   SerSteelFrame.com — Industrial-Architectural Visual Design System (v2.1)
   Zero CDN · Gunmetal + Galvanized Zinc + Forged Copper + CAD Blueprint Slate
   Full LTR + RTL (/ar/) Support · Mandatory tabular-nums
   ========================================================================== */

:root {
  /* Core Structural Gunmetal & Galvanized Zinc Palette */
  --ssf-graphite-950: #0b1017;
  --ssf-gunmetal-900: #111923;
  --ssf-gunmetal-800: #1b2634;
  --ssf-steel-700:    #2c3b4e;
  --ssf-zinc-600:     #4b5968;
  --ssf-zinc-400:     #8a99a8;
  --ssf-zinc-200:     #d5dce4;
  --ssf-zinc-100:     #eceff3;
  --ssf-zinc-50:      #f6f7f9;
  --ssf-white:        #ffffff;
  --ssf-ink-900:      #0e1620;

  /* Forged Industrial Copper & CAD Blueprint Accents */
  --ssf-accent-copper:       #c85219;
  --ssf-accent-copper-hover: #a84110;
  --ssf-accent-on-dark:      #f0803c;
  --ssf-accent-soft:         #fdf3ed;
  --ssf-accent-border:       #f2c9b0;
  --ssf-blueprint-700:       #1d4e68;
  --ssf-blueprint-50:        #eef5f9;

  /* Status & Conversion */
  --ssf-whatsapp:       #25d366;
  --ssf-whatsapp-hover: #1da851;
  --ssf-success:        #15803d;
  --ssf-success-bg:     #ecfdf3;
  --ssf-warning:        #b45309;
  --ssf-warning-bg:     #fffbeb;

  /* Zero-CDN System Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-rtl:  "Segoe UI", Tahoma, "Geeza Pro", system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Architectural Geometry & Layout */
  --container-max:  1260px;
  --prose-max:      74ch;
  --topbar-height:  36px;
  --header-height:  74px;
  --radius-xs:      4px;
  --radius-sm:      6px;
  --radius-md:      8px;
  --radius-lg:      12px;

  /* Crisp Industrial Shadows */
  --shadow-card:    0 1px 3px rgba(11, 16, 23, 0.06), 0 1px 2px rgba(11, 16, 23, 0.04);
  --shadow-hover:   0 12px 26px -8px rgba(11, 16, 23, 0.14), 0 4px 8px -4px rgba(11, 16, 23, 0.06);
  --shadow-copper:  0 6px 20px rgba(200, 82, 25, 0.26);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ssf-ink-900);
  background-color: var(--ssf-zinc-50);
  overflow-x: hidden;
}

html[dir="rtl"] body {
  font-family: var(--font-rtl);
  line-height: 1.78;
}

a {
  color: var(--ssf-blueprint-700);
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

a:hover {
  color: var(--ssf-accent-copper);
}

img, svg {
  max-width: 100%;
  vertical-align: middle;
}

/* Mandatory Tabular Numerals for Engineering Precision (Rule 55) */
table, td, th, .ssf-num, .ssf-stat-val, .ssf-price, .ssf-mono, input, select {
  font-variant-numeric: tabular-nums;
}

.ssf-mono {
  font-family: var(--font-mono);
  font-size: 0.84em;
  letter-spacing: -0.01em;
}

/* Layout Containers */
.ssf-container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 20px;
}

.ssf-section {
  padding-block: 68px;
}

.ssf-section-white {
  background-color: var(--ssf-white);
  border-top: 1px solid var(--ssf-zinc-200);
  border-bottom: 1px solid var(--ssf-zinc-200);
}

.ssf-section-zinc {
  background-color: var(--ssf-zinc-50);
}

/* Structural CAD Blueprint Grid on Dark Sections (Rule 56) */
.ssf-section-dark {
  background-color: var(--ssf-graphite-950);
  color: var(--ssf-white);
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.036) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.036) 1px, transparent 1px);
  background-size: 32px 32px;
}

.ssf-section-console {
  background-color: var(--ssf-gunmetal-900);
  color: var(--ssf-white);
  border-top: 1px solid var(--ssf-steel-700);
  border-bottom: 1px solid var(--ssf-steel-700);
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
  margin-top: 0;
  color: inherit;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.85rem, 3.1vw, 2.68rem);
  font-weight: 700;
  margin-bottom: 18px;
}

h2 {
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  font-weight: 700;
  margin-bottom: 14px;
}

h3 {
  font-size: 1.16rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.ssf-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 5px 10px;
  border-radius: var(--radius-xs);
  background: rgba(240, 128, 60, 0.14);
  color: var(--ssf-accent-on-dark);
  border: 1px solid rgba(240, 128, 60, 0.34);
  margin-bottom: 16px;
}

.ssf-eyebrow-light {
  background: var(--ssf-accent-soft);
  color: var(--ssf-accent-copper);
  border-color: var(--ssf-accent-border);
}

.ssf-lead {
  font-size: 1.08rem;
  color: #cbd5e1;
  max-width: 68ch;
  margin-bottom: 26px;
}

.ssf-sub {
  color: var(--ssf-zinc-600);
  max-width: 70ch;
  margin-bottom: 32px;
}

/* Topbar & Sticky Header */
.ssf-topbar {
  background-color: var(--ssf-graphite-950);
  color: #cbd5e1;
  font-size: 0.79rem;
  border-bottom: 1px solid var(--ssf-steel-700);
}

.ssf-topbar-inner {
  min-height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 6px;
}

.ssf-topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.ssf-topbar a {
  color: var(--ssf-accent-on-dark);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ssf-topbar a:hover {
  color: var(--ssf-white);
}

.ssf-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background-color: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ssf-zinc-200);
}

.ssf-header-inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.ssf-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ssf-ink-900);
}

.ssf-brand:hover {
  color: var(--ssf-ink-900);
}

.ssf-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.ssf-brand-name {
  font-weight: 800;
  font-size: 1.16rem;
  letter-spacing: -0.02em;
  color: var(--ssf-ink-900);
}

.ssf-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ssf-zinc-600);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ssf-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ssf-nav-link {
  padding: 8px 11px;
  border-radius: var(--radius-sm);
  font-size: 0.89rem;
  font-weight: 600;
  color: var(--ssf-ink-900);
  white-space: nowrap;
}

.ssf-nav-link:hover,
.ssf-nav-link.is-active {
  background-color: var(--ssf-zinc-100);
  color: var(--ssf-accent-copper);
}

.ssf-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Language Switcher */
.ssf-lang-wrap {
  position: relative;
}

.ssf-lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  background: var(--ssf-zinc-50);
  border: 1px solid var(--ssf-zinc-200);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ssf-ink-900);
  cursor: pointer;
}

.ssf-lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  inset-inline-end: 0;
  min-width: 195px;
  background: var(--ssf-white);
  border: 1px solid var(--ssf-zinc-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hover);
  padding: 6px;
  display: none;
  z-index: 950;
}

.ssf-lang-wrap.is-open .ssf-lang-menu {
  display: block;
}

.ssf-lang-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.85rem;
  color: var(--ssf-ink-900);
}

.ssf-lang-item:hover,
.ssf-lang-item.is-current {
  background: var(--ssf-accent-soft);
  color: var(--ssf-accent-copper);
  font-weight: 600;
}

/* Buttons (Sharp 6px Industrial Radius — Rule 56) */
.ssf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: center;
}

.ssf-btn-primary {
  background-color: var(--ssf-accent-copper);
  color: var(--ssf-white);
  box-shadow: var(--shadow-copper);
}

.ssf-btn-primary:hover {
  background-color: var(--ssf-accent-copper-hover);
  color: var(--ssf-white);
  transform: translateY(-1px);
}

.ssf-btn-outline-dark {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ssf-steel-700);
  color: var(--ssf-white);
}

.ssf-btn-outline-dark:hover {
  border-color: var(--ssf-accent-on-dark);
  color: var(--ssf-accent-on-dark);
}

.ssf-btn-outline {
  background: var(--ssf-white);
  border-color: var(--ssf-zinc-200);
  color: var(--ssf-ink-900);
}

.ssf-btn-outline:hover {
  border-color: var(--ssf-accent-copper);
  color: var(--ssf-accent-copper);
}

.ssf-btn-wa {
  background-color: var(--ssf-whatsapp);
  color: #ffffff;
}

.ssf-btn-wa:hover {
  background-color: var(--ssf-whatsapp-hover);
  color: #ffffff;
}

/* Hero Grid */
.ssf-hero {
  padding-block: 56px 64px;
}

.ssf-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.ssf-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.ssf-stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  padding-top: 24px;
  border-top: 1px solid var(--ssf-steel-700);
}

.ssf-stat-box {
  background: rgba(27, 38, 52, 0.68);
  border: 1px solid var(--ssf-steel-700);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.ssf-stat-val {
  font-size: 1.24rem;
  font-weight: 800;
  color: var(--ssf-accent-on-dark);
  font-family: var(--font-mono);
}

.ssf-stat-lbl {
  font-size: 0.78rem;
  color: #cbd5e1;
  margin-top: 3px;
  line-height: 1.35;
}

/* Cards & Grids */
.ssf-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

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

.ssf-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.ssf-card {
  background: var(--ssf-white);
  border: 1px solid var(--ssf-zinc-200);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}

.ssf-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--ssf-accent-border);
}

.ssf-card-dark {
  background: var(--ssf-gunmetal-800);
  border: 1px solid var(--ssf-steel-700);
  color: var(--ssf-white);
}

.ssf-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  background: var(--ssf-blueprint-50);
  color: var(--ssf-blueprint-700);
  border: 1px solid #cde0ec;
}

.ssf-badge-copper {
  background: var(--ssf-accent-soft);
  color: var(--ssf-accent-copper);
  border-color: var(--ssf-accent-border);
}

.ssf-badge-success {
  background: var(--ssf-success-bg);
  color: var(--ssf-success);
  border-color: #bbf7d0;
}

/* Quick Engineering & Container Info Bar (Rule 25) */
.ssf-quick-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  background: var(--ssf-gunmetal-800);
  border: 1px solid var(--ssf-steel-700);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-top: 22px;
}

.ssf-quick-item {
  padding: 8px 10px;
  border-inline-end: 1px solid var(--ssf-steel-700);
}

.ssf-quick-item:last-child {
  border-inline-end: none;
}

.ssf-quick-lbl {
  font-size: 0.73rem;
  color: var(--ssf-zinc-400);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.ssf-quick-val {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ssf-white);
  margin-top: 4px;
}

/* Engineering Tables (BOM, Packages, Specs) */
.ssf-table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--ssf-zinc-200);
  border-radius: var(--radius-md);
  background: var(--ssf-white);
}

.ssf-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: start;
}

.ssf-table th {
  background: var(--ssf-zinc-100);
  color: var(--ssf-ink-900);
  font-weight: 700;
  padding: 12px 14px;
  border-bottom: 1px solid var(--ssf-zinc-200);
  white-space: nowrap;
}

.ssf-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--ssf-zinc-100);
  vertical-align: top;
}

.ssf-table tbody tr:nth-child(even) {
  background-color: #fafbfc;
}

.ssf-table tbody tr:hover {
  background-color: var(--ssf-blueprint-50);
}

/* Interactive Calculator Console */
.ssf-calc-console {
  background: var(--ssf-gunmetal-800);
  border: 1px solid var(--ssf-steel-700);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
}

.ssf-field {
  margin-bottom: 16px;
}

.ssf-field label {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: #e2e8f0;
}

.ssf-light-form .ssf-field label {
  color: var(--ssf-ink-900);
}

.ssf-input,
.ssf-select,
.ssf-textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--ssf-steel-700);
  background: var(--ssf-graphite-950);
  color: var(--ssf-white);
  font-size: 0.93rem;
  font-family: inherit;
}

.ssf-light-form .ssf-input,
.ssf-light-form .ssf-select,
.ssf-light-form .ssf-textarea {
  background: var(--ssf-white);
  border-color: var(--ssf-zinc-200);
  color: var(--ssf-ink-900);
}

.ssf-input:focus,
.ssf-select:focus,
.ssf-textarea:focus {
  outline: 2px solid var(--ssf-accent-on-dark);
  border-color: transparent;
}

.ssf-calc-results {
  background: var(--ssf-graphite-950);
  border: 1px solid var(--ssf-steel-700);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ssf-res-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.ssf-res-card {
  background: var(--ssf-gunmetal-900);
  border: 1px solid var(--ssf-steel-700);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.ssf-res-lbl {
  font-size: 0.74rem;
  color: var(--ssf-zinc-400);
}

.ssf-res-val {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--ssf-white);
  margin-top: 4px;
}

.ssf-fob-highlight {
  background: rgba(200, 82, 25, 0.14);
  border: 1px solid rgba(240, 128, 60, 0.45);
  border-radius: var(--radius-sm);
  padding: 15px;
  margin-bottom: 16px;
}

.ssf-fob-price {
  font-family: var(--font-mono);
  font-size: 1.42rem;
  font-weight: 800;
  color: var(--ssf-accent-on-dark);
  margin-top: 4px;
}

/* Climate Tabs */
.ssf-tabs-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.ssf-tab-btn {
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--ssf-zinc-200);
  background: var(--ssf-white);
  color: var(--ssf-ink-900);
  font-weight: 600;
  font-size: 0.87rem;
  cursor: pointer;
}

.ssf-tab-btn.is-active {
  background: var(--ssf-blueprint-700);
  border-color: var(--ssf-blueprint-700);
  color: var(--ssf-white);
}

.ssf-tab-panel {
  display: none;
}

.ssf-tab-panel.is-active {
  display: block;
}

/* Breadcrumbs (Rule 15) */
.ssf-breadcrumb {
  padding-block: 12px;
  font-size: 0.83rem;
  color: var(--ssf-zinc-600);
  border-bottom: 1px solid var(--ssf-zinc-200);
  background: var(--ssf-white);
}

.ssf-breadcrumb-dark {
  background: rgba(17, 25, 35, 0.8);
  border-bottom-color: var(--ssf-steel-700);
  color: var(--ssf-zinc-400);
}

.ssf-breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.ssf-breadcrumb-dark a {
  color: #cbd5e1;
}

/* 16-Section Numbered Engineering Headers */
.ssf-sec-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 26px;
  padding-inline: 6px;
  border-radius: var(--radius-xs);
  background: var(--ssf-graphite-950);
  color: var(--ssf-accent-on-dark);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  margin-inline-end: 10px;
}

/* FAQ Accordion */
.ssf-faq-list {
  display: grid;
  gap: 10px;
}

.ssf-faq-item {
  background: var(--ssf-white);
  border: 1px solid var(--ssf-zinc-200);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.ssf-faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 20px;
  font-weight: 700;
  font-size: 0.98rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.ssf-faq-item summary::-webkit-details-marker {
  display: none;
}

.ssf-faq-item[open] summary {
  border-bottom: 1px solid var(--ssf-zinc-100);
  color: var(--ssf-accent-copper);
}

.ssf-faq-ans {
  padding: 16px 20px;
  color: var(--ssf-zinc-600);
  font-size: 0.94rem;
}

/* Footer */
.ssf-footer {
  background-color: var(--ssf-graphite-950);
  color: #cbd5e1;
  border-top: 1px solid var(--ssf-steel-700);
  padding-block: 56px 96px;
}

.ssf-footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr 1.15fr;
  gap: 32px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--ssf-steel-700);
}

.ssf-footer-title {
  color: var(--ssf-white);
  font-size: 0.92rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
  font-family: var(--font-mono);
}

.ssf-footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.ssf-footer-links a {
  color: #cbd5e1;
  font-size: 0.89rem;
}

.ssf-footer-links a:hover {
  color: var(--ssf-accent-on-dark);
}

.ssf-gsm-card {
  background: var(--ssf-gunmetal-900);
  border: 1px solid var(--ssf-steel-700);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 12px;
}

.ssf-footer-bottom {
  padding-top: 24px;
  font-size: 0.8rem;
  color: var(--ssf-zinc-400);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
}

/* Mobile Hamburger & Right-Sliding Off-Canvas (Rule 36: max-width 320px, right slide) */
.ssf-burger-btn {
  display: none;
  background: var(--ssf-zinc-50);
  border: 1px solid var(--ssf-zinc-200);
  border-radius: var(--radius-sm);
  padding: 8px;
  color: var(--ssf-ink-900);
  cursor: pointer;
}

.ssf-offcanvas-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 16, 23, 0.65);
  z-index: 1100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.ssf-offcanvas-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.ssf-offcanvas {
  position: fixed;
  top: 0;
  right: 0;
  width: 80vw;
  max-width: 320px;
  height: 100vh;
  background: var(--ssf-graphite-950);
  color: var(--ssf-white);
  z-index: 1200;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  padding: 20px;
  overflow-y: auto;
  border-left: 1px solid var(--ssf-steel-700);
}

.ssf-offcanvas.is-open {
  transform: translateX(0);
}

.ssf-offcanvas-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ssf-steel-700);
}

.ssf-offcanvas-close {
  background: var(--ssf-gunmetal-800);
  border: 1px solid var(--ssf-steel-700);
  color: var(--ssf-white);
  border-radius: var(--radius-xs);
  padding: 6px;
  cursor: pointer;
}

.ssf-offcanvas-nav {
  display: grid;
  gap: 6px;
  margin-block: 18px;
}

.ssf-offcanvas-nav a {
  color: var(--ssf-white);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.03);
}

.ssf-offcanvas-nav a:hover {
  background: var(--ssf-accent-copper);
}

/* Fixed Bottom-Left Scroll-to-Top (Rule 37: bottom: 24px; left: 20px) */
.ssf-scroll-top {
  position: fixed;
  bottom: 24px;
  left: 20px;
  z-index: 1000;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: var(--ssf-graphite-950);
  color: var(--ssf-white);
  border: 1px solid var(--ssf-steel-700);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, background-color 0.2s ease;
  box-shadow: var(--shadow-hover);
}

.ssf-scroll-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.ssf-scroll-top:hover {
  background: var(--ssf-accent-copper);
  border-color: var(--ssf-accent-copper);
}

/* Fixed Bottom-Right Pulsing WhatsApp Button (Rule 38: bottom: 24px; right: 20px) */
@keyframes ssfPulseWa {
  0%   { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.55); }
  70%  { box-shadow: 0 0 0 14px rgba(37, 211, 102, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

.ssf-float-wa {
  position: fixed;
  bottom: 24px;
  right: 20px;
  z-index: 1000;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--ssf-whatsapp);
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  animation: ssfPulseWa 2.4s infinite;
  box-shadow: 0 8px 22px rgba(11, 16, 23, 0.28);
}

.ssf-float-wa:hover {
  background: var(--ssf-whatsapp-hover);
  color: #ffffff;
}

.ssf-float-wa-tip {
  position: absolute;
  right: 64px;
  background: var(--ssf-graphite-950);
  color: var(--ssf-white);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  border: 1px solid var(--ssf-steel-700);
}

.ssf-float-wa:hover .ssf-float-wa-tip {
  opacity: 1;
}

/* Kit Comparison Sticky Bar */
.ssf-compare-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ssf-gunmetal-900);
  color: var(--ssf-white);
  border-top: 2px solid var(--ssf-accent-copper);
  padding: 12px 20px;
  z-index: 980;
  display: none;
}

.ssf-compare-drawer.is-active {
  display: block;
}

/* Responsive Breakpoints */
@media (max-width: 1040px) {
  .ssf-hero-grid,
  .ssf-calc-console {
    grid-template-columns: 1fr;
  }
  .ssf-quick-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .ssf-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .ssf-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .ssf-topbar-hide-sm,
  .ssf-nav,
  .ssf-header-cta-desktop {
    display: none;
  }
  .ssf-burger-btn {
    display: inline-flex;
  }
  .ssf-stats-strip,
  .ssf-grid-2,
  .ssf-grid-3,
  .ssf-grid-4,
  .ssf-quick-grid,
  .ssf-footer-grid,
  .ssf-res-grid {
    grid-template-columns: 1fr;
  }
  .ssf-quick-item {
    border-inline-end: none;
    border-bottom: 1px solid var(--ssf-steel-700);
  }
  .ssf-quick-item:last-child {
    border-bottom: none;
  }
  .ssf-section {
    padding-block: 46px;
  }
}