/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --primary: #0a1628;
  --primary-light: #132240;
  --accent: #d61618;
  --accent-hover: #eb2123;
  --accent-glow: rgba(214, 22, 24, 0.45);
  --white: #ffffff;
  --light: #f5f7fa;
  --light-alt: #eef1f5;
  --gray: #6b7b8d;
  --gray-light: #a0aec0;
  --dark: #1a1a2e;
  --home-dark-bg: rgb(81, 81, 81); /* 1. 首页画卷背景色 */
  --header-bg: #000000;           /* 2. 顶部导航栏背景色 */
  --card-bg: #787878;             /* 3. 产品卡片与数据卡片背景色 */
  --card-title-color: #f0f0f0;    /* 4. 大字颜色 (标题/标签/数据) */
  --card-desc-color: #dcdcdc;     /* 5. 小字颜色 (特性/描述/辅助) */
  --text: #2d3748;
  --text-light: #4a5568;
  --border: #e2e8f0;
  --shadow: 0 0.125rem 0.75rem rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 0.5rem 1.875rem rgba(0, 0, 0, 0.12);
  --radius: 0.5rem;
  --radius-lg: 1rem;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 100rem; /* Exact 1600px designer specification at 1920 (100rem) */
  --container-max-width: 100rem;
  --site-container-w: min(calc(100% - 3rem), var(--container-max-width, 100rem));
  --header-h: 4.625rem; /* 74px at 1920 baseline, scales smoothly on 2K/4K */
  --font: 'Source Sans 3', 'Source Sans Pro', 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Source Sans 3', 'Source Sans Pro', 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

@media (max-width: 1599px) {
  :root {
    --site-container-w: min(88%, 85rem);
  }
}

@media (max-width: 768px) {
  :root {
    --site-container-w: min(92%, calc(100% - 2rem));
  }
}

*, *::before, *::after { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
}

/* Forcefully remove outline on all elements upon focus */
*:focus,
*:focus-visible,
*:focus-within,
a:focus,
a:focus-visible,
button:focus,
button:focus-visible,
input:focus,
input:focus-visible,
select:focus,
textarea:focus,
[tabindex]:focus {
  outline: none !important;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
}

/* 1. Large 2K / 4K / 5K Proportional Scaling (1920 baseline -> 16px) */
@media (min-width: 1921px) {
  html {
    font-size: calc(100vw / 120); /* 1920 -> 16px, 2560 (2K) -> 21.33px, 3840 (4K) -> 32px */
  }
}

/* 2. Standard 1080p Desktop (1537px - 1920px) */
@media (min-width: 1537px) and (max-width: 1920px) {
  html {
    font-size: 15.5px;
  }
}

body {
  font-family: var(--font);
  color: #f8fafc;
  background-color: var(--home-dark-bg, rgb(81, 81, 81));
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  padding-top: var(--header-h) !important;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: #ffffff; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

/* ============================================
   Unified Global Container (Strict Variable-Driven Single Source)
   ============================================ */
.container,
.home-dark-canvas .container,
.site-header .header-inner,
.footer-container,
.mega-menu-inner.container {
  width: var(--site-container-w) !important;
  max-width: var(--container-max-width, 100rem) !important;
  margin-inline: auto !important;
  box-sizing: border-box !important;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.text-center { text-align: center; }
.text-light { color: #b8b8b8; }

.section {
  padding: 5rem 0;
  background: var(--home-dark-bg, rgb(81, 81, 81));
}
.section-dark {
  background: var(--home-dark-bg, rgb(81, 81, 81));
  color: var(--white);
}
.section-dark h2, .section-dark h3 { color: var(--white); }
.section-light {
  background: var(--home-dark-bg, rgb(81, 81, 81));
}
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-header h2 {
  margin-bottom: 1rem;
  position: relative;
}
.section-header p {
  color: var(--gray);
  max-width: 40rem;
  margin-inline: auto;
  font-size: 1.05rem;
}
.section-dark .section-header p { color: var(--gray-light); }

/* ============================================
/* ============================================
   Unified Brand Numbered Button System (.clt-btn-1)
   Single Source of Truth for all site buttons
   ============================================ */
.clt-btn-1,
.clt-btn-2 {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  text-align: center !important;
  font-family: var(--font, inherit) !important;
  font-size: 0.95rem !important;
  font-weight: 700 !important;
  line-height: 1.25 !important;
  letter-spacing: 0.02em !important;
  padding: 0.52rem 1.45rem !important;
  border-radius: 9999px !important;
  text-decoration: none !important;
  box-sizing: border-box !important;
  white-space: nowrap !important;
  cursor: pointer !important;
  width: auto !important;
  height: auto !important;
  min-width: 0 !important;
  min-height: 0 !important;
  outline: none !important;
  box-shadow: none !important;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1) !important;
  /* background: green; */
}

/* 1. Primary Red Filled Pill Button (.clt-btn-1) */
.clt-btn-1 {
  background: var(--accent, #d61618) !important;
  border: 1.5px solid var(--accent, #d61618) !important;
  color: #ffffff !important;
}

.clt-btn-1:hover {
  background: var(--accent-hover, #eb2123) !important;
  border-color: var(--accent-hover, #eb2123) !important;
  color: #ffffff !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(214, 22, 24, 0.45) !important;
}

/* 2. Secondary Outline Pill Button (.clt-btn-2) */
.clt-btn-2 {
  background: rgba(214, 22, 24, 0.08) !important;
  border: 1.5px solid var(--accent, #d61618) !important;
  color: var(--accent, #d61618) !important;
}

.clt-btn-2:hover {
  background: var(--accent, #d61618) !important;
  border-color: var(--accent, #d61618) !important;
  color: #ffffff !important;
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(214, 22, 24, 0.35) !important;
}

.clt-btn-1 svg,
.clt-btn-2 svg {
  width: 1.1em !important;
  height: 1.1em !important;
  margin-left: 0.35em !important;
}

/* ============================================
   Unified Global Breadcrumb Component (Single Source of Truth)
   ============================================ */
.clt-breadcrumb {
  background: var(--home-dark-bg, rgb(81, 81, 81)) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
  padding: 1.15rem 0 !important;
  width: 100%;
  box-sizing: border-box;
}
.clt-breadcrumb .container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  font-size: 0.92rem;
  line-height: 1.4;
}
.clt-breadcrumb a {
  color: #b8b8b8 !important;
  text-decoration: none;
  font-weight: 500 !important;
  transition: color 0.2s ease;
}
.clt-breadcrumb a:hover {
  color: #ffffff !important;
}
.clt-breadcrumb .sep {
  color: #b8b8b8 !important;
  font-size: 0.85em;
  user-select: none;
  display: inline-flex;
  align-items: center;
}
.clt-breadcrumb .current {
  color: #ffffff !important;
  font-weight: 600 !important;
}

/* ============================================
   Unified Dark Canvas Background for ALL Inner Pages (Matching Homepage Style)
   ============================================ */
body:not(.home), body:not(.home) main, body:not(.home) .site-main, body:not(.home) .product-archive-section, body:not(.home) .solutions-archive-section, body:not(.home) .cases-archive-section, body:not(.home) .news-archive-section, body:not(.home) .single-product-section, body:not(.home) .clt-product-specs-section, body:not(.home) .clt-pdp-inquiry-section, body:not(.home) .clt-about-page-wrapper,  body:not(.home) .about-intro-section, body:not(.home) .about-mission-vision-section, body:not(.home) .contact-page-section, body:not(.home) .support-page-section, body:not(.home) .faq-section, body:not(.home) .legal-policy-section {
  background-color: var(--home-dark-bg, rgb(81, 81, 81)) !important;
  color: #f8fafc;
}

[data-theme="dark"] .clt-breadcrumb,
.dark-theme .clt-breadcrumb {
  background: #070d18 !important;
  border-bottom-color: #1a2c47 !important;
}
[data-theme="dark"] .clt-breadcrumb a,
.dark-theme .clt-breadcrumb a {
  color: #b8b8b8 !important;
}
[data-theme="dark"] .clt-breadcrumb .sep,
.dark-theme .clt-breadcrumb .sep {
  color: #475569 !important;
}
[data-theme="dark"] .clt-breadcrumb .current,
.dark-theme .clt-breadcrumb .current {
  color: #f1f5f9 !important;
  font-weight: 500 !important;
}

/* ============================================
   Unified Global Subpage Hero Banner Component
   ============================================ */
.clt-subpage-hero {
  position: relative;
  width: 100%;
  height: 16.5rem;
  min-height: 13.75rem;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-sizing: border-box;
}
.clt-subpage-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 14, 26, 0.65) 0%, rgba(8, 14, 26, 0.86) 100%);
  z-index: 1;
}
.clt-subpage-hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}
.clt-subpage-hero-title {
  font-family: var(--font-heading, inherit);
  font-size: clamp(1.85rem, 3vw, 2.5rem);
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 0.45rem 0;
  line-height: 1.25;
  letter-spacing: -0.015em;
  text-align: center;
}
.clt-subpage-hero-subtitle {
  font-size: clamp(0.95rem, 1.15vw, 1.08rem);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.82);
  margin: 0;
  line-height: 1.5;
  max-width: 48rem;
  text-align: center;
}

/* ============================================
   Unified Global Inquiry & Contact Form Component
   ============================================ */
.clt-inquiry-section {
  padding: 5rem 0 5.5rem;
  position: relative;
  width: 100%;
  box-sizing: border-box;
}
.clt-inquiry-section.theme-dark {
  background: transparent;
  color: #ffffff;
}
.clt-inquiry-section.theme-light {
  /* background: #ffffff; */
  color: #0f172a;
  /* border-top: 1px solid #f1f5f9; */
  padding-top: 0;
}
.clt-inquiry-wrapper {
  max-width: min(100%, 58rem);
  margin: 0 auto;
  text-align: center;
}
.clt-inquiry-title {
  font-family: var(--font-heading, inherit);
  font-size: 2.2rem;
  font-weight: 700;
  max-width: 100%;
  margin: 0 auto 0.75rem;
  line-height: 1.25;
}
.theme-dark .clt-inquiry-title { color: #ffffff; }
.theme-light .clt-inquiry-title { color: #ffffff; }

.clt-inquiry-sub {
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 100%;
  margin: 0 auto 2.2rem;
}
.theme-dark .clt-inquiry-sub { color: rgba(255, 255, 255, 0.75); }
.theme-light .clt-inquiry-sub {color: #fff;}

.clt-inquiry-success-msg {
  padding: 1.1rem 1.4rem;
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.4);
  border-radius: 8px;
  color: #4ade80;
  margin-bottom: 1.5rem;
  text-align: center;
  font-size: 0.98rem;
  font-weight: 500;
  animation: fadeIn 0.3s ease;
}

.clt-inquiry-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  text-align: left;
}
.clt-inquiry-form .form-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.clt-inquiry-form .form-row-full {
  width: 100%;
}
.clt-inquiry-form .form-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.45rem;
  width: 100%;
}
.clt-inquiry-form .form-label {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  color: #a0a0a0;
}
.theme-dark .clt-inquiry-form .form-label { color: #a0a0a0; }
.theme-light .clt-inquiry-form .form-label { color: #a0a0a0; font-weight: 400; margin-bottom: 0.3rem; }


.clt-inquiry-form .clt-form-input {
  width: 100%;
  border-radius: 0.5rem;
  padding: 0.85rem 1.15rem;
  font-size: 1.02rem;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  box-sizing: border-box;
}
.theme-dark .clt-inquiry-form .clt-form-input {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #ffffff;
}
.theme-dark .clt-inquiry-form .clt-form-input:focus {
  border-color: var(--accent, #d71a18);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 0 3px rgba(215, 26, 24, 0.2);
}
.theme-light .clt-inquiry-form .clt-form-input {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  color: #0f172a;
}
.theme-light .clt-inquiry-form .clt-form-input:focus {
  border-color: var(--accent, #d71a18);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(215, 26, 24, 0.12);
}

.clt-inquiry-form .form-footer-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.6rem;
}
.clt-inquiry-form .clt-checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.95rem;
  cursor: pointer;
}
.theme-dark .clt-inquiry-form .clt-checkbox-label { color: rgba(255, 255, 255, 0.85); }
.theme-light .clt-inquiry-form .clt-checkbox-label {color: #fff;}
.clt-inquiry-form .clt-checkbox-label a { color: inherit; text-decoration: underline; }
.clt-inquiry-form .clt-checkbox-label a:hover { color: var(--accent, #d71a18); }

.clt-inquiry-form .clt-checkbox-label input[type="checkbox"] {
  accent-color: var(--accent, #d71a18);
  width: 1.15rem;
  height: 1.15rem;
  cursor: pointer;
}

/* ============================================
   Unified Global Floating Actions (Back to Top & FullPage Mode)
   ============================================ */
.clt-floating-action-group {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  pointer-events: none;
}
.clt-floating-action-group > * {
  pointer-events: auto;
}
.clt-floating-btn {
  width: 2.85rem;
  height: 2.85rem;
  border-radius: 50%;
  background: #ffffff;
  color: #0f172a;
  border: 1px solid rgba(15, 23, 42, 0.12);
  box-shadow: 0 0.25rem 1rem rgba(15, 23, 42, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  margin: 0;
  outline: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.clt-floating-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  stroke: currentColor;
  transition: transform 0.2s ease;
}
.clt-floating-btn:hover {
  background: var(--accent, #d71a18) !important;
  color: #ffffff !important;
  border-color: var(--accent, #d71a18) !important;
  transform: translateY(-0.2rem) scale(1.06);
  box-shadow: 0 0.375rem 1.25rem rgba(215, 26, 24, 0.35);
}
.clt-floating-btn:hover svg {
  transform: translateY(-0.1rem);
}

/* FullPage Toggle Specific Styling (Circular Icon-Only) */
.btn-fullpage-switch.is-active {
  background: #0f172a;
  color: #22c55e;
  border-color: #22c55e;
  box-shadow: 0 0.25rem 1rem rgba(34, 197, 94, 0.3);
}
.btn-fullpage-switch.is-active:hover {
  background: var(--accent, #d71a18) !important;
  color: #ffffff !important;
  border-color: var(--accent, #d71a18) !important;
}

/* Back to Top Specific Visibility */
.clt-back-to-top {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(0.5rem) scale(0.9);
}
.clt-back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

[data-theme="dark"] .clt-floating-btn,
.dark-theme .clt-floating-btn {
  background: #1e293b;
  color: #f1f5f9;
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 0.25rem 1.25rem rgba(0, 0, 0, 0.4);
}

@media (max-width: 1023px) {
  .btn-fullpage-switch {
    display: none !important;
  }
}

/* ============================================
   Unified Global Pagination Component
   ============================================ */
.clt-pagination-container {
  margin-top: 3.5rem;
  display: flex;
  justify-content: center;
  width: 100%;
}
.clt-pagination-nav {
  display: block;
}
.clt-pagination-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.clt-page-item {
  margin: 0;
}
.clt-page-item a,
.clt-page-item span.current,
.clt-page-item span.dots {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.625rem;
  height: 2.625rem;
  padding: 0 0.875rem;
  border-radius: 0.5rem;
  font-family: var(--font-heading, 'Outfit', sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  box-sizing: border-box;
  transition: all 0.2s ease;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #f8fafc;
}
.clt-page-item a:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: var(--accent, #d61618);
  color: #ffffff;
  transform: translateY(-1px);
}
.clt-page-item.is-active a,
.clt-page-item.is-active span.current {
  background: var(--accent, #d61618) !important;
  border-color: var(--accent, #d61618) !important;
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(214, 22, 24, 0.35);
}
.clt-page-item.is-dots span.dots {
  border: none;
  background: transparent;
  color: #b8b8b8;
}

/* ============================================
   Universal Subpage Hero Banner Styling
   ============================================ */
.clt-solutions-banner-wrap,
.clt-cases-banner-wrap,
.clt-news-banner-wrap,
.about-pure-hero-wrap,
.clt-page-pure-hero-wrap {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: #000000;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: normal;
}
.clt-solutions-banner-img,
.clt-cases-banner-img,
.clt-news-banner-img,
.about-pure-hero-img,
.clt-page-pure-hero-img {
  width: 100%;
  height: auto;
  display: block;
  max-width: 100%;
  object-fit: cover;
}
.clt-page-hero-overlay,
.clt-solutions-banner-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(0, 0, 0, 0.35) 0%, rgba(0, 0, 0, 0.6) 100%);
  z-index: 1;
  pointer-events: none;
}
.clt-page-hero-content {
  position: absolute;
  top: clamp(10rem, 36vh, 26rem);
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(92%, 64rem);
  z-index: 2;
  text-align: center;
  padding: 0 1.5rem;
  box-sizing: border-box;
  pointer-events: none;
}
.clt-page-hero-content .container {
  max-width: 100%;
  margin: 0 auto;
  pointer-events: auto;
}
.clt-page-hero-title,
.clt-solutions-banner-title {
  font-family: var(--font-heading, 'Outfit', sans-serif);
  font-size: clamp(2.2rem, 4.2vw, 3.5rem);
  font-weight: 800;
  color: #ffffff !important;
  margin: 0 0 1rem 0;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.65);
}
.clt-page-hero-desc,
.clt-solutions-banner-desc {
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.95) !important;
  max-width: 52rem;
  margin: 0 auto;
  font-weight: 400;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.75);
}

@media (max-width: 768px) {
  .clt-page-hero-content {
    top: clamp(6.5rem, 28vh, 12rem);
    padding: 0 1rem;
  }
  .clt-solutions-banner-content {
    padding: 1.5rem 1rem 2rem;
  }
  .clt-page-hero-title,
  .clt-solutions-banner-title {
    font-size: 1.85rem;
    margin-bottom: 0.65rem;
  }
  .clt-page-hero-desc,
  .clt-solutions-banner-desc {
    font-size: 0.92rem;
    line-height: 1.55;
  }
}