/* =============================================================
   Firecomms China — Official Style Sheet v4.0
   Brand: firecomms.com design language
   Colors: Navy #003270 / Royal #1d3686 / Dark Navy #00165f / Red #c00000
   Fonts: Lato (body) / Roboto Slab (headings) / Montserrat (buttons)
   ============================================================= */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Lato:wght@400;700;900&family=Roboto+Slab:wght@400;700&family=Montserrat:wght@600;700;900&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --navy:        #003270;
  --royal:       #1d3686;
  --dark-navy:   #00165f;
  --brand-red:   #c00000;
  --white:       #ffffff;
  --off-white:   #f5f7fa;
  --light-gray:  #eef1f5;
  --mid-gray:    #777a7e;
  --text-dark:   #1e1e1e;
  --text-body:   #444444;
  --border:      #d0d4db;

  --font-body:    'Lato', sans-serif;
  --font-heading: 'Roboto Slab', serif;
  --font-btn:     'Montserrat', sans-serif;

  --shadow-xs:    0 1px 4px rgba(0,0,0,.06);
  --shadow-sm:    0 2px 8px rgba(0,0,0,.08);
  --shadow-md:    0 4px 16px rgba(0,0,0,.12);
  --shadow-lg:    0 8px 32px rgba(0,0,0,.18);
  --shadow-xl:    0 12px 48px rgba(0,0,0,.22);

  --radius-xs:    3px;
  --radius-sm:    4px;
  --radius-md:    6px;
  --radius-lg:    10px;
  --radius-xl:    16px;
  --radius-full:  9999px;

  --max-w:        1200px;
  --nav-h:        72px;
  --header-top-h: auto;

  --transition-fast:  .15s ease;
  --transition-mid:   .25s ease;
  --transition-slow:  .4s ease;
}

/* =============================================================
   1. GLOBAL RESET
   ============================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-body);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  padding: 0;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

input[type="checkbox"] {
  cursor: pointer;
}

/* ---------- Custom Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--light-gray); }
::-webkit-scrollbar-thumb {
  background: var(--navy);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--royal); }

/* ---------- Text Selection ---------- */
::selection {
  background: var(--navy);
  color: var(--white);
}

/* ---------- Focus Styles ---------- */
:focus-visible {
  outline: 2px solid var(--brand-red);
  outline-offset: 2px;
}

/* =============================================================
   2. UTILITY CLASSES
   ============================================================= */
.container {
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  width: 100%;
}

.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.red-line {
  display: block;
  width: 48px;
  height: 4px;
  background: var(--brand-red);
  margin: 12px auto 0;
  border-radius: 2px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: .95rem;
  color: var(--mid-gray);
  max-width: 680px;
  margin: 0 auto 12px;
  text-align: center;
  line-height: 1.75;
}

.pt-section { padding-top: 80px; }
.pb-section { padding-bottom: 80px; }
.py-section { padding-top: 80px; padding-bottom: 80px; }
.px-section { padding-left: 20px; padding-right: 20px; }

/* =============================================================
   3. BUTTONS
   ============================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-btn);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: all var(--transition-mid);
  cursor: pointer;
  white-space: nowrap;
  line-height: 1;
  text-decoration: none;
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--brand-red);
  outline-offset: 2px;
}

/* Primary — Navy bg, white text */
.btn-primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn-primary:hover {
  background: var(--dark-navy);
  border-color: var(--dark-navy);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,50,112,.3);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* White — transparent bg, white border/text (on dark bg) */
.btn-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.7);
}
.btn-white:hover {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
  transform: translateY(-2px);
}

/* White Filled — white bg, navy text (on dark bg) */
.btn-white-filled {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
}
.btn-white-filled:hover {
  background: var(--off-white);
  border-color: var(--off-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,.2);
}

/* Red — brand-red bg, white text */
.btn-red {
  background: var(--brand-red);
  color: var(--white);
  border-color: var(--brand-red);
}
.btn-red:hover {
  background: #9b0000;
  border-color: #9b0000;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(192,0,0,.3);
}

/* Outline — transparent bg, navy border/text */
.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
  border-width: 2px;
}
.btn-outline:hover {
  background: var(--navy);
  color: var(--white);
  transform: translateY(-2px);
}

/* Small button */
.btn-sm {
  font-size: .7rem;
  padding: 9px 18px;
  letter-spacing: .06em;
}

/* Block button */
.btn-block {
  display: flex;
  width: 100%;
}

/* =============================================================
   4. SITE HEADER
   ============================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: 0 1px 0 var(--border);
}

/* ---------- Header Top Bar ---------- */
.header-top {
  background: var(--navy);
  padding: 6px 0;
  font-size: .78rem;
}

.header-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.header-top-left {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.header-top-item {
  display: flex;
  align-items: center;
  gap: 5px;
  color: rgba(255,255,255,.75);
  font-size: .72rem;
  letter-spacing: .03em;
}
.header-top-item svg {
  width: 13px;
  height: 13px;
  stroke: rgba(255,255,255,.65);
  fill: none;
  stroke-width: 2;
  flex-shrink: 0;
}
.header-top-left a {
  color: rgba(255,255,255,.85);
  transition: color .2s;
}
.header-top-left a:hover {
  color: var(--white);
  text-decoration: underline;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
}
.lang-switch span {
  color: rgba(255,255,255,.35);
  font-size: .72rem;
  padding: 0 4px;
}
.lang-switch a {
  padding: 3px 9px;
  border-radius: var(--radius-xs);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: rgba(255,255,255,.55);
  transition: all var(--transition-fast);
}
.lang-switch a:hover {
  color: var(--white);
  background: rgba(255,255,255,.1);
}
.lang-switch a.active {
  background: rgba(255,255,255,.18);
  color: var(--white);
}

/* ---------- Header Main ---------- */
.header-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--border);
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  padding: 0;
  height: 100%;
  padding-right: 20px;
  border-right: 1px solid var(--border);
}

.brand-logo {
  height: 32px;
  width: auto;
  object-fit: contain;
  object-position: left center;
  display: block;
}

.brand-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-text .name-cn {
  font-family: var(--font-heading);
  font-size: .95rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: .04em;
  line-height: 1.2;
}

.brand-text .name-en {
  font-family: var(--font-body);
  font-size: .7rem;
  color: var(--mid-gray);
  letter-spacing: .05em;
  line-height: 1.2;
}

/* Main Navigation */
.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  height: 100%;
}

.nav-list {
  display: flex;
  align-items: stretch;
  gap: 0;
  height: 100%;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 16px;
  height: 100%;
  font-family: var(--font-btn);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-dark);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--brand-red);
  transform: scaleX(0);
  transition: transform var(--transition-mid);
}

.nav-link:hover,
.nav-item:hover .nav-link {
  color: var(--navy);
}

.nav-item:hover .nav-link::after {
  transform: scaleX(1);
}

.nav-link .chevron {
  font-size: .55rem;
  color: var(--brand-red);
  transition: transform var(--transition-mid);
  margin-left: 2px;
  line-height: 1;
}

.nav-item:hover .nav-link .chevron {
  transform: rotate(180deg);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% - 1px);
  left: 0;
  background: var(--white);
  border: 1px solid var(--border);
  border-top: 3px solid var(--brand-red);
  box-shadow: var(--shadow-md);
  min-width: 210px;
  padding: 8px 0;
  display: none;
  z-index: 1001;
}

.nav-item:hover > .nav-dropdown {
  display: block;
}

.nav-dropdown a {
  display: block;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: .82rem;
  color: var(--text-body);
  transition: all var(--transition-fast);
  border-bottom: 1px solid var(--light-gray);
}

.nav-dropdown li:last-child a {
  border-bottom: none;
}

.nav-dropdown a:hover {
  background: var(--off-white);
  color: var(--navy);
  padding-left: 24px;
}

/* Nav CTA */
.nav-cta {
  flex-shrink: 0;
}

/* ---------- Mobile Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: var(--nav-h);
  height: var(--nav-h);
  padding: 8px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition-fast);
  border-radius: var(--radius-xs);
}

.nav-toggle:hover {
  background: var(--off-white);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all var(--transition-mid);
  transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--white);
  z-index: 999;
  overflow-y: auto;
  padding: 20px;
}

.mobile-menu.open {
  display: block;
}

.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.mobile-menu-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 1.2rem;
  color: var(--navy);
  cursor: pointer;
  background: none;
}

.mobile-menu a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  font-family: var(--font-btn);
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text-dark);
  border-bottom: 1px solid var(--border);
  transition: color var(--transition-fast);
}

.mobile-menu a:hover {
  color: var(--navy);
}

.mobile-menu .mobile-sub {
  padding-left: 20px;
  font-size: .82rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--mid-gray);
  border-bottom: none;
  padding-top: 8px;
  padding-bottom: 8px;
}

.mobile-menu .mobile-sub:hover {
  color: var(--navy);
}

/* =============================================================
   5. HERO SECTION
   ============================================================= */
.hero {
  position: relative;
  height: 580px;
  overflow: hidden;
  display: flex;
  align-items: stretch;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('https://images.unsplash.com/photo-1581091226825-a6a2a5aee158?w=1600&q=80') center/cover no-repeat;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(0,50,112,.9) 0%,
    rgba(0,50,112,.75) 45%,
    rgba(0,50,112,.4) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  align-items: center;
  width: 100%;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

.hero-label {
  display: inline-block;
  font-family: var(--font-btn);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: rgba(255,255,255,.65);
  margin-bottom: 14px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 16px;
  max-width: 580px;
}

.hero-title .red {
  color: var(--brand-red);
}

.hero-title-en {
  font-family: var(--font-body);
  font-size: .88rem;
  color: rgba(255,255,255,.7);
  letter-spacing: .04em;
  margin-bottom: 20px;
}

.hero-desc {
  font-family: var(--font-body);
  font-size: .92rem;
  color: rgba(255,255,255,.82);
  max-width: 480px;
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* =============================================================
   6. PAGE BANNER
   ============================================================= */
.page-banner {
  background: linear-gradient(135deg, var(--navy) 0%, var(--royal) 100%);
  height: 200px;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.page-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url('https://images.unsplash.com/photo-1581091226825-a6a2a5aee158?w=1600&q=60') center/cover no-repeat;
  opacity: .12;
  z-index: 0;
}

.page-banner .container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-banner h1 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
  line-height: 1.2;
}

.page-banner p {
  font-family: var(--font-body);
  font-size: .9rem;
  color: rgba(255,255,255,.7);
  max-width: 500px;
}

/* =============================================================
   7. ADVANTAGES / CORE VALUES
   ============================================================= */
.advantages {
  padding: 80px 0;
  background: var(--white);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.adv-card {
  background: var(--white);
  padding: 32px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  border-top: 3px solid var(--brand-red);
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  transition: all var(--transition-mid);
  text-align: center;
}

.adv-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 32px rgba(0,0,0,.12);
  border-color: var(--navy);
  border-top-color: var(--brand-red);
}

.adv-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--off-white);
  border-radius: 50%;
  border: 2px solid var(--light-gray);
}

.adv-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--navy);
  fill: none;
  stroke-width: 1.8;
}

.adv-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.adv-card p {
  font-family: var(--font-body);
  font-size: .88rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* =============================================================
   8. PRODUCT CARDS (Homepage Featured)
   ============================================================= */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.prod-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  transition: all var(--transition-mid);
}

.prod-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,0,0,.12);
  border-color: var(--navy);
}

.prod-card-head {
  background: linear-gradient(135deg, var(--navy) 0%, var(--royal) 100%);
  padding: 20px;
  border-bottom: 1px solid var(--border);
  min-height: 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.prod-badge {
  display: inline-block;
  padding: 3px 8px;
  font-size: .68rem;
  font-weight: 700;
  font-family: var(--font-btn);
  letter-spacing: .08em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  color: var(--white);
  line-height: 1.4;
}

.prod-badge.red { background: var(--brand-red); }
.prod-badge.blue { background: rgba(255,255,255,.2); color: var(--white); }
.prod-badge.royal { background: var(--royal); }
.prod-badge.navy { background: var(--navy); }
.prod-badge.gray { background: var(--mid-gray); }

.prod-card-head h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}

.prod-card-body {
  padding: 20px;
}

.prod-card-body p {
  font-size: .85rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 16px;
}

.prod-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--light-gray);
}

.prod-price {
  font-family: var(--font-btn);
  font-size: .78rem;
  font-weight: 700;
  color: var(--navy);
}

/* =============================================================
   9. SOLUTION CARDS
   ============================================================= */
.sol-card {
  background: var(--white);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
  overflow: hidden;
  transition: all var(--transition-mid);
}

.sol-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,.12);
  border-color: var(--navy);
}

.sol-card-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 28px 32px 20px;
  border-bottom: 1px solid var(--border);
}

.sol-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--off-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.sol-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--navy);
  fill: none;
  stroke-width: 1.8;
}

.sol-card-head h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
  line-height: 1.3;
}

.sol-card-head p {
  font-family: var(--font-body);
  font-size: .85rem;
  color: var(--mid-gray);
  margin-top: 4px;
  line-height: 1.5;
}

.sol-card-body {
  padding: 24px 32px;
}

.sol-card-body p {
  font-family: var(--font-body);
  font-size: .9rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 16px;
}

.sol-card-body ul {
  margin-bottom: 16px;
}

.sol-card-body li {
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  font-size: .88rem;
  color: var(--text-body);
  line-height: 1.6;
}

.sol-card-body li::before {
  content: '\2713';
  color: var(--brand-red);
  position: absolute;
  left: 0;
  font-weight: 700;
  font-size: .85rem;
}

/* =============================================================
   10. PRODUCT TABS (products.html)
   ============================================================= */
.products-tabs {
  padding: 60px 0;
  background: var(--white);
}

.tab-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0;
  margin-bottom: 32px;
}

.tab-btn {
  padding: 10px 20px;
  font-family: var(--font-btn);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  background: var(--off-white);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--text-body);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}

.tab-btn:hover {
  color: var(--navy);
  background: var(--light-gray);
}

.tab-btn.active {
  background: var(--navy);
  color: var(--white);
  border-bottom-color: var(--brand-red);
}

.tab-panel {
  display: none;
}

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

/* Spec Table (inside tabs) */
.spec-table-wrap {
  overflow-x: auto;
  margin: 0 0 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
}

.spec-table thead tr {
  background: var(--navy);
  color: var(--white);
}

.spec-table th {
  padding: 13px 16px;
  text-align: left;
  font-family: var(--font-btn);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.spec-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-dark);
  vertical-align: middle;
}

.spec-table tbody tr:last-child td {
  border-bottom: none;
}

.spec-table tbody tr:hover td {
  background: var(--off-white);
}

.status-badge {
  display: inline-block;
  padding: 3px 9px;
  font-size: .7rem;
  font-weight: 700;
  font-family: var(--font-btn);
  border-radius: var(--radius-xs);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.status-badge.available {
  background: rgba(76,175,80,.12);
  color: #4caf50;
}

.status-badge.demand {
  background: rgba(255,152,0,.12);
  color: #ff9800;
}

.tab-actions {
  display: flex;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

/* =============================================================
   11. PRODUCT SEARCH PAGE (product-index.html)
   ============================================================= */
.search-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  padding: 40px 0;
  align-items: start;
}

/* Filter Sidebar */
.filter-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}

.filter-mobile-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--navy);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-family: var(--font-btn);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  cursor: pointer;
  margin-bottom: 16px;
  border: none;
}

.filter-section {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.filter-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.filter-section h4 {
  font-family: var(--font-heading);
  font-size: .88rem;
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--brand-red);
  display: inline-block;
}

.filter-section label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  padding: 4px 0;
  cursor: pointer;
  color: var(--text-body);
  transition: color var(--transition-fast);
  user-select: none;
}

.filter-section label:hover {
  color: var(--navy);
}

.filter-section input[type="checkbox"] {
  accent-color: var(--navy);
  width: 14px;
  height: 14px;
  cursor: pointer;
  flex-shrink: 0;
}

/* Search Bar */
.search-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.search-bar input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--white);
  color: var(--text-dark);
}

.search-bar input:focus {
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(0,50,112,.1);
}

.search-bar input::placeholder {
  color: var(--mid-gray);
}

/* Result Meta */
.result-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  font-size: .82rem;
  color: var(--mid-gray);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 8px;
}

.result-meta strong {
  color: var(--navy);
  font-weight: 700;
}

/* Product List Item */
.product-list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.product-list-item:hover {
  border-color: var(--navy);
  box-shadow: 0 4px 16px rgba(0,0,0,.08);
  transform: translateX(3px);
}

.product-list-item .series-tag {
  padding: 4px 10px;
  font-size: .68rem;
  font-weight: 700;
  font-family: var(--font-btn);
  letter-spacing: .06em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  color: var(--white);
  white-space: nowrap;
  flex-shrink: 0;
}

.series-tag.optolock { background: var(--royal); }
.series-tag.lc       { background: var(--navy); }
.series-tag.redlink  { background: var(--brand-red); }
.series-tag.pof      { background: var(--royal); }
.series-tag.kit      { background: var(--mid-gray); }

.product-list-item .model-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  white-space: nowrap;
}

.product-list-item .model-series {
  font-family: var(--font-body);
  font-size: .8rem;
  color: var(--mid-gray);
  white-space: nowrap;
}

.product-list-item .model-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.product-list-item .model-specs {
  flex: 1;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.product-list-item .model-spec {
  display: flex;
  flex-direction: column;
}

.product-list-item .model-spec-label {
  font-size: .68rem;
  color: var(--mid-gray);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.product-list-item .model-spec-value {
  font-weight: 700;
  color: var(--navy);
  font-size: .85rem;
}

.product-list-item .model-status {
  font-size: .72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  white-space: nowrap;
  flex-shrink: 0;
}

.product-list-item .model-status.available {
  background: rgba(76,175,80,.12);
  color: #4caf50;
}

.product-list-item .model-status.demand {
  background: rgba(255,152,0,.12);
  color: #ff9800;
}

.product-list-item .model-action {
  flex-shrink: 0;
  white-space: nowrap;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.pagination button {
  min-width: 38px;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .82rem;
  font-family: var(--font-body);
  background: var(--white);
  color: var(--text-body);
  transition: all var(--transition-fast);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pagination button:hover {
  border-color: var(--navy);
  color: var(--navy);
}

.pagination button.active {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
  font-weight: 700;
}

.pagination button:disabled {
  opacity: .4;
  cursor: not-allowed;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--mid-gray);
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--light-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-state-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--mid-gray);
  fill: none;
  stroke-width: 1.5;
}

.empty-state h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--navy);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: .88rem;
  color: var(--mid-gray);
}

/* =============================================================
   12. PRODUCT DETAIL PAGE (product-detail.html)
   ============================================================= */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  padding: 40px 0;
  align-items: start;
}

/* Breadcrumb */
.breadcrumb {
  font-size: .82rem;
  color: var(--mid-gray);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--navy);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--brand-red);
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--border);
  font-size: .75rem;
}

/* Detail Main */
.detail-main h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.2;
}

.detail-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.detail-specs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding: 24px;
  background: var(--off-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.detail-spec-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px;
  border-right: 1px solid var(--border);
}

.detail-spec-item:last-child,
.detail-spec-item:nth-child(3n) {
  border-right: none;
}

.detail-spec-label {
  font-size: .72rem;
  color: var(--mid-gray);
  text-transform: uppercase;
  letter-spacing: .5px;
  font-family: var(--font-btn);
}

.detail-spec-value {
  font-weight: 700;
  color: var(--navy);
  font-size: .95rem;
  font-family: var(--font-heading);
}

.detail-desc {
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.8;
  margin-bottom: 24px;
  color: var(--text-body);
}

.detail-features {
  margin-bottom: 24px;
}

.detail-features h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--brand-red);
  display: inline-block;
}

.detail-features ul {
  margin-bottom: 12px;
}

.detail-features li {
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  font-size: .88rem;
  color: var(--text-body);
  line-height: 1.6;
}

.detail-features li::before {
  content: '\2713';
  color: var(--brand-red);
  position: absolute;
  left: 0;
  font-weight: 700;
  font-size: .85rem;
}

.detail-applications {
  margin-bottom: 24px;
}

.detail-applications h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 12px;
}

.detail-applications li {
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
  font-size: .88rem;
  color: var(--text-body);
}

.detail-applications li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-red);
}

/* Detail Sidebar */
.detail-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}

.spec-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  background: var(--off-white);
}

.spec-preview iframe {
  width: 100%;
  height: 500px;
  border: none;
  display: block;
}

.spec-preview-placeholder {
  height: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--mid-gray);
  font-size: .85rem;
  padding: 20px;
  text-align: center;
}

.spec-preview-placeholder svg {
  width: 48px;
  height: 48px;
  stroke: var(--mid-gray);
  fill: none;
  stroke-width: 1.5;
  opacity: .5;
}

.detail-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.detail-actions .btn {
  justify-content: center;
  padding: 14px 20px;
  font-size: .82rem;
}

.contact-mini {
  background: var(--off-white);
  padding: 16px;
  border-radius: var(--radius-md);
  margin-top: 16px;
  border: 1px solid var(--border);
}

/* PDF Download Bar */
.pdf-download-bar {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.pdf-download-bar .btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  font-size: .85rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.pdf-download-bar .btn:hover {
  opacity: .9;
  transform: translateY(-1px);
}

/* Spec Preview iframe */
.spec-preview iframe {
  width: 100%;
  height: 560px;
  border: none;
  display: block;
  background: #f5f5f5;
}

/* Breadcrumb */
.breadcrumb {
  font-size: .82rem;
  color: var(--mid-gray);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--navy);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--brand-red);
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--border);
  font-size: .75rem;
}

/* Contact mini in detail sidebar */
.contact-mini {
  background: var(--off-white);
  padding: 16px;
  border-radius: var(--radius-md);
  margin-top: 16px;
  border: 1px solid var(--border);
}

.contact-mini h4 {
  font-family: var(--font-heading);
  font-size: .9rem;
  color: var(--navy);
  margin-bottom: 10px;
}

.contact-mini p {
  font-size: .82rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 6px;
}

.contact-mini a {
  color: var(--navy);
  font-weight: 700;
}

.contact-mini a:hover {
  color: var(--brand-red);
  text-decoration: underline;
}

/* =============================================================
   13. CONTACT PAGE
   ============================================================= */
.contact-section {
  padding: 60px 0 80px;
  background: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 48px;
  margin-top: 48px;
  align-items: start;
}

.contact-info h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--navy);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--brand-red);
  display: inline-block;
}

.contact-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-item-icon {
  width: 40px;
  height: 40px;
  background: var(--off-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.contact-item-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--navy);
  fill: none;
  stroke-width: 2;
}

.contact-item-text {
  flex: 1;
}

.contact-item-text strong {
  display: block;
  font-family: var(--font-btn);
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--navy);
  margin-bottom: 4px;
}

.contact-item-text span,
.contact-item-text a {
  font-family: var(--font-body);
  font-size: .88rem;
  color: var(--text-body);
  display: block;
  line-height: 1.6;
}

.contact-item-text a:hover {
  color: var(--brand-red);
}

/* Contact Form */
.contact-form {
  width: 100%;
}

.contact-form-header {
  margin-bottom: 24px;
}

.contact-form-header h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--navy);
  margin-bottom: 8px;
}

.contact-form-header p {
  font-size: .88rem;
  color: var(--mid-gray);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-family: var(--font-btn);
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--navy);
  margin-bottom: 6px;
}

.form-group label .req {
  color: var(--brand-red);
}

.form-control {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  color: var(--text-dark);
  background: var(--white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.form-control:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: 0 0 0 3px rgba(0,50,112,.1);
}

.form-control.error {
  border-color: var(--brand-red);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

select.form-control {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23777a7e' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-error {
  font-size: .75rem;
  color: var(--brand-red);
  margin-top: 4px;
  min-height: 18px;
  display: block;
}

.form-success {
  background: rgba(76,175,80,.1);
  border: 1px solid #4caf50;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: #2e7d32;
  font-size: .88rem;
  margin-bottom: 16px;
  display: none;
  align-items: center;
  gap: 8px;
}

.form-success.show {
  display: flex;
}

.form-note {
  font-size: .78rem;
  color: var(--mid-gray);
  margin-top: 10px;
  text-align: center;
}

/* =============================================================
   14. FLOATING CONTACT (Right-side Fixed)
   ============================================================= */
.floating-contact {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.floating-contact a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--white);
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
  margin-bottom: 10px;
  transition: all .3s ease;
  position: relative;
  cursor: pointer;
  border: none;
}

.floating-contact a:hover {
  background: var(--navy);
  transform: scale(1.12);
  box-shadow: 0 6px 24px rgba(0,0,0,.25);
}

.floating-contact a:hover svg {
  stroke: var(--white);
}

.floating-contact svg {
  width: 22px;
  height: 22px;
  stroke: var(--navy);
  fill: none;
  stroke-width: 2;
  transition: stroke .3s;
}

.fc-tooltip {
  position: absolute;
  right: 60px;
  background: var(--navy);
  color: var(--white);
  font-size: .75rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  font-family: var(--font-btn);
  font-weight: 700;
  letter-spacing: .04em;
}

.fc-tooltip::after {
  content: '';
  position: absolute;
  right: -5px;
  top: 50%;
  transform: translateY(-50%);
  border: 5px solid transparent;
  border-left-color: var(--navy);
}

.floating-contact a:hover .fc-tooltip {
  opacity: 1;
}

.fc-wechat-panel {
  display: none;
  position: absolute;
  right: 62px;
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  padding: 12px 12px 10px;
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0,0,0,.22);
  z-index: 10001;
  text-align: center;
  min-width: 220px;
}

.fc-wechat-panel::after {
  content: "";
  position: absolute;
  right: -7px;
  top: 50%;
  transform: translateY(-50%);
  width: 0; height: 0;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 7px solid #fff;
}

.fc-wechat-panel.show {
  display: block;
  animation: fc-pop-in .15s ease-out;
}

@keyframes fc-pop-in {
  from { opacity: 0; transform: translateY(-50%) translateX(8px); }
  to { opacity: 1; transform: translateY(-50%) translateX(0); }
}

.fc-wechat-panel img {
  width: 220px;
  height: auto;
  display: block;
  border-radius: 6px;
  margin: 0 auto;
}

.fc-wechat-panel .fc-wx-title {
  font-size: .82rem;
  font-weight: 600;
  color: var(--navy);
  margin: 8px 0 2px;
  letter-spacing: .02em;
}

.fc-wechat-panel .fc-wx-sub {
  font-size: .68rem;
  color: var(--mid-gray);
  margin: 0;
}

/* =============================================================
   15. FOOTER
   ============================================================= */
.site-footer {
  background: var(--dark-navy);
  padding: 60px 0 0;
  color: rgba(255,255,255,.8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand img {
  height: 32px;
  margin-bottom: 12px;
  object-fit: contain;
  object-position: left;
}

/* Footer dual logos */
.footer-logos {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.footer-brand-logo.simacity {
  height: 26px;
  object-fit: contain;
  object-position: left;
}

.footer-brand-logo.firecomms {
  height: 24px;
  object-fit: contain;
  object-position: left;
}

.footer-logo-divider {
  width: 1px;
  height: 22px;
  background: rgba(255,255,255,.25);
}

.footer-brand p {
  font-size: .82rem;
  color: rgba(255,255,255,.6);
  line-height: 1.7;
  margin-top: 12px;
}

.footer-col h4 {
  color: var(--white);
  font-family: var(--font-btn);
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--brand-red);
  display: inline-block;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col li {
  font-size: .82rem;
  color: rgba(255,255,255,.65);
  line-height: 1.5;
}

.footer-col a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 20px 0;
  margin-top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .78rem;
  color: rgba(255,255,255,.45);
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom-left {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom a {
  color: rgba(255,255,255,.5);
  transition: color var(--transition-fast);
}

.footer-bottom a:hover {
  color: var(--white);
}

/* =============================================================
   16. BACK TO TOP
   ============================================================= */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--navy);
  color: var(--white);
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
  z-index: 8888;
  cursor: pointer;
  border: none;
  transition: all var(--transition-mid);
}

.back-to-top.visible {
  display: flex;
}

.back-to-top:hover {
  background: var(--brand-red);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,.3);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
  stroke: var(--white);
  fill: none;
  stroke-width: 2.5;
}

/* =============================================================
   17. ABOUT PAGE
   ============================================================= */
.about-section {
  padding: 80px 0;
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
  margin-top: 48px;
}

.about-img-wrap {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.about-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-text h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: var(--navy);
  margin-bottom: 16px;
  line-height: 1.3;
}

.about-text p {
  font-size: .95rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 18px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 36px;
}

.stat-item {
  text-align: center;
  padding: 24px 12px;
  background: var(--off-white);
  border-radius: var(--radius-md);
  border-top: 3px solid var(--brand-red);
}

.stat-num {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: .75rem;
  color: var(--mid-gray);
  font-family: var(--font-btn);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* Timeline */
.about-timeline {
  padding: 60px 0;
  background: var(--off-white);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 40px auto 0;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--brand-red);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--brand-red);
}

.timeline-year {
  font-family: var(--font-btn);
  font-size: .78rem;
  font-weight: 700;
  color: var(--brand-red);
  margin-bottom: 4px;
  letter-spacing: .06em;
}

.timeline-item h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 4px;
}

.timeline-item p {
  font-size: .88rem;
  color: var(--text-body);
}

/* =============================================================
   18. NEWS SECTION
   ============================================================= */
.news-section {
  padding: 60px 0;
  background: var(--white);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.news-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-mid);
}

.news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--navy);
}

.news-card-img {
  aspect-ratio: 16/9;
  overflow: hidden;
}

.news-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.news-card:hover .news-card-img img {
  transform: scale(1.05);
}

.news-card-body {
  padding: 20px;
}

.news-card-date {
  font-size: .75rem;
  color: var(--brand-red);
  font-weight: 700;
  font-family: var(--font-btn);
  letter-spacing: .04em;
  margin-bottom: 8px;
}

.news-card-body h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 8px;
  line-height: 1.3;
}

.news-card-body p {
  font-size: .85rem;
  color: var(--text-body);
  line-height: 1.6;
}

/* =============================================================
   18b. NEWS MODAL (About page)
   ============================================================= */
.news-tile {
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease;
}
.news-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,.14);
}
.news-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.news-modal.show { display: flex; }
.news-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(9,26,78,.55);
}
.news-modal-box {
  position: relative;
  z-index: 1;
  background: #fff;
  border-radius: 12px;
  max-width: 640px;
  width: 100%;
  max-height: 86vh;
  overflow-y: auto;
  box-shadow: 0 24px 60px rgba(0,0,0,.3);
  animation: newsPop .22s ease;
}
@keyframes newsPop {
  from { opacity: 0; transform: translateY(16px) scale(.98); }
  to   { opacity: 1; transform: none; }
}
.news-modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  z-index: 2;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(9,26,78,.08);
  color: var(--navy);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.news-modal-close:hover { background: var(--brand-red); color: #fff; }
.news-modal-body img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: 12px 12px 0 0;
  display: block;
}
.news-modal-body .nm-pad { padding: 24px 28px 30px; }
.news-modal-body .nm-date { font-size: .75rem; color: var(--mid-gray); margin-bottom: 6px; }
.news-modal-body .nm-title {
  font-family: var(--font-heading);
  color: var(--navy);
  font-size: 1.25rem;
  margin: 0 0 14px;
  line-height: 1.4;
}
.news-modal-body .nm-text { color: var(--text-body); line-height: 1.85; font-size: .92rem; }
.news-modal-body .nm-text p { margin: 0 0 12px; }
.news-detail { display: none; }

/* =============================================================
   19. SECTION BACKGROUNDS
   ============================================================= */
.bg-white    { background: var(--white); }
.bg-offwhite { background: var(--off-white); }
.bg-navy     { background: var(--navy); }
.bg-dark     { background: var(--dark-navy); }

/* =============================================================
   20. RESPONSIVE — 1024px (Tablet)
   ============================================================= */
@media (max-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .search-layout {
    grid-template-columns: 1fr;
  }

  .filter-sidebar {
    display: none;
  }

  .filter-mobile-toggle {
    display: flex !important;
  }

  .detail-layout {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-title {
    font-size: 2.6rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .detail-specs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =============================================================
   21. RESPONSIVE — 768px (Mobile)
   ============================================================= */
@media (max-width: 768px) {
  :root {
    --nav-h: 60px;
  }

  /* Hero */
  .hero {
    height: 420px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-desc {
    font-size: .88rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-actions .btn {
    text-align: center;
    width: 100%;
    justify-content: center;
  }

  /* Grids */
  .products-grid,
  .advantages-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

  /* Navigation */
  .nav-list {
    display: none;
  }

  .nav-toggle {
    display: flex !important;
  }

  .main-nav {
    justify-content: flex-end;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  /* Form */
  .form-row {
    grid-template-columns: 1fr;
  }

  /* Product List */
  .product-list-item {
    flex-wrap: wrap;
    gap: 10px;
  }

  .product-list-item .model-specs {
    display: none;
  }

  /* Floating Contact */
  .floating-contact {
    display: none;
  }

  /* Page Banner */
  .page-banner {
    height: 160px;
    padding: 20px 0;
  }

  .page-banner h1 {
    font-size: 1.6rem;
  }

  /* Section Titles */
  .section-title {
    font-size: 1.6rem;
  }

  /* Detail */
  .detail-specs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .detail-sidebar {
    position: static;
  }

  /* About Stats */
  .about-stats {
    grid-template-columns: 1fr;
  }

  .about-preview-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* Tab Nav */
  .tab-nav {
    gap: 4px;
  }

  .tab-btn {
    padding: 8px 12px;
    font-size: .7rem;
  }

  /* Pagination */
  .pagination {
    gap: 4px;
  }

  /* Solutions */
  .sol-card-head {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .sol-card-body {
    padding: 20px;
  }
}

/* =============================================================
   21. AVAGO CROSS REFERENCE PAGE
   ============================================================= */
.cross-ref-hero {
  background: var(--off-white);
  border-radius: 12px;
  padding: 36px 32px 28px;
  margin-bottom: 32px;
  text-align: center;
}
.cross-ref-hero .section-title {
  font-size: 1.6rem;
}
.cross-ref-search-bar {
  position: relative;
  max-width: 600px;
  margin: 0 auto 20px;
}
.cross-ref-input {
  width: 100%;
  padding: 14px 48px 14px 20px;
  font-size: 1rem;
  font-family: var(--font-body);
  border: 2px solid var(--border);
  border-radius: 8px;
  background: white;
  color: var(--text-body);
  transition: border-color 0.2s;
  box-sizing: border-box;
}
.cross-ref-input:focus {
  outline: none;
  border-color: var(--navy);
}
.cross-ref-clear {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--mid-gray);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  display: none;
}
.cross-ref-clear:hover { color: var(--navy); }
.cross-ref-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 20px;
}
.chip {
  padding: 7px 18px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: white;
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.chip:hover {
  border-color: var(--navy);
  color: var(--navy);
}
.chip.active {
  background: var(--navy);
  border-color: var(--navy);
  color: white;
}
.cross-ref-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
  font-size: .9rem;
  color: var(--text-light);
}
.cross-ref-table-wrap {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 40px;
}
.cross-ref-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
  background: white;
  font-size: .88rem;
}
.cross-ref-table thead tr {
  background: var(--navy);
  color: white;
}
.cross-ref-table th {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 700;
  white-space: nowrap;
}
.cross-ref-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.cross-ref-table tbody tr:nth-child(even) {
  background: var(--off-white);
}
.cross-ref-table tbody tr:hover {
  background: #e8f0fb;
}
.cross-ref-table td {
  padding: 12px 16px;
  vertical-align: middle;
}
.avago-code {
  font-family: 'Courier New', monospace;
  font-size: .82rem;
  background: #fff3e0;
  padding: 3px 7px;
  border-radius: 4px;
  color: #bf360c;
  white-space: nowrap;
}
.fc-code {
  font-family: 'Courier New', monospace;
  font-size: .82rem;
  background: #e3f2fd;
  padding: 3px 7px;
  border-radius: 4px;
  color: #0d47a1;
  white-space: nowrap;
}
.series-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: .75rem;
  font-weight: 700;
  white-space: nowrap;
}
.tag-1m   { background: #e1f5fe; color: #01579b; }
.tag-5m   { background: #e3f2fd; color: #0d47a1; }
.tag-10m  { background: #f3e5f5; color: #4a148c; }
.tag-50m  { background: #e8f5e9; color: #1b5e20; }
.tag-conn { background: #fafafa; color: #555; border: 1px solid #ddd; }
.tag-fiber{ background: #fff8e1; color: #e65100; }
.cross-ref-empty {
  padding: 48px 20px;
  text-align: center;
}
.cross-ref-changelog {
  background: #f8f9fa;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 28px 20px;
  margin-bottom: 24px;
}
.changelog-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.changelog-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: .88rem;
  color: var(--text-body);
}
.changelog-date {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--navy);
  white-space: nowrap;
  min-width: 90px;
}
.cross-ref-disclaimer {
  background: #fff8e1;
  border-left: 4px solid #ffc107;
  border-radius: 4px;
  padding: 16px 20px;
  font-size: .83rem;
  color: #666;
  line-height: 1.8;
  margin-bottom: 40px;
}

.cross-ref-table .fc-link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  border-bottom: 1px dashed rgba(0,72,154,.35);
  transition: border-color .15s, background .15s;
}
.cross-ref-table .fc-link:hover {
  border-bottom-color: var(--brand-red);
}
.cross-ref-table .fc-link:hover .fc-code {
  background: var(--brand-red);
  border-color: var(--brand-red);
  color: #fff;
}

/* ---- Avago search result banner (product-index) ---- */
.xref-result-banner {
  border: 1px solid rgba(198,26,47,.28);
  border-left: 4px solid var(--brand-red);
  background: #fff8f8;
  border-radius: 6px;
  padding: 16px 20px;
  margin-bottom: 18px;
}
.xref-result-title {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--brand-red);
  font-size: .95rem;
  margin-bottom: 10px;
}
.xref-result-pairs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 10px;
}
.xref-pair {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .88rem;
}
.xref-pair .fc-link { text-decoration: none; }
.xref-pair .fc-link:hover .fc-code {
  background: var(--brand-red);
  border-color: var(--brand-red);
  color: #fff;
}
.xref-arrow {
  color: var(--mid-gray);
  font-weight: 700;
}
.xref-result-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px dashed rgba(198,26,47,.25);
  font-size: .82rem;
  color: var(--text-light);
}
.xref-result-foot a {
  color: var(--brand-red);
  font-weight: 700;
  text-decoration: none;
}
.xref-result-foot a:hover { text-decoration: underline; }

/* ---- Real orderable SKUs shown on cards / detail ---- */
.model-skus,
.detail-skus {
  font-family: 'SFMono-Regular', Menlo, Consolas, monospace;
  font-size: .74rem;
  color: var(--navy);
  letter-spacing: .01em;
}
.model-skus {
  display: block;
  margin-top: 3px;
  opacity: .85;
}
.detail-skus {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: .82rem;
}
.detail-skus-label {
  font-family: var(--font-body);
  font-size: .78rem;
  color: var(--text-light);
}

/* Avago cross-ref entry hint (product-index / en) */
.cross-ref-hint {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  background: linear-gradient(90deg, rgba(192,0,0,.05), rgba(0,50,112,.05));
  border: 1px solid rgba(192,0,0,.2);
  border-left: 4px solid var(--brand-red);
  border-radius: 4px;
  padding: 12px 18px;
  margin: 14px 0 20px;
  font-size: .86rem;
  color: var(--text-body);
  line-height: 1.6;
}
.cross-ref-hint code {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 6px;
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: .82rem;
  color: var(--navy);
}
.cross-ref-hint .btn { margin-left: auto; white-space: nowrap; }
@media (max-width: 640px) {
  .cross-ref-hint .btn { margin-left: 0; width: 100%; text-align: center; }
}

/* =============================================================
   22. PRINT STYLES
   ============================================================= */
@media print {
  .site-header,
  .floating-contact,
  .back-to-top,
  .nav-toggle,
  .mobile-menu {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }

  .page-banner {
    background: #003270 !important;
    color: #fff;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .spec-table thead tr {
    background: #003270 !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}