/* ==========================================================================
   Foshan NODA Electronic Technology Co., Ltd. - Corporate Website
   Design References: Mercury, ASML, Tesla, Apple
   Style: Minimalist, Refined, Credible, Editorial Industrial
   Typography: Times New Roman with SimSun Fallback
   ========================================================================== */

:root {
  /* Typography - Strict Project Constraint: Times New Roman + SimSun */
  --font-serif: "Times New Roman", "SimSun", "Songti SC", serif;

  /* Surfaces & Backgrounds */
  --bg-primary: #fbfaf8;
  --bg-surface: #ffffff;
  --bg-subtle: #f5f4ef;
  --bg-muted: #eeece6;
  --bg-card: #ffffff;

  /* Typography Colors - Checked for WCAG AA 4.5:1 contrast against light surfaces */
  --text-primary: #151714;
  --text-secondary: #4a4d46;
  --text-tertiary: #595d56;
  --text-inverse: #ffffff;

  /* Borders & Dividers */
  --border-subtle: #e6e4dc;
  --border-medium: #d4d2c8;
  --border-strong: #151714;

  /* Restrained Slate Blue Accent */
  --accent-slate: #32506d;
  --accent-slate-hover: #22374d;
  --accent-slate-subtle: #eef3f7;
  --accent-slate-border: #b8c9d6;

  /* Spacing & Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-subtle: 0 2px 16px rgba(21, 23, 20, 0.04);
  --shadow-medium: 0 10px 32px rgba(21, 23, 20, 0.06);
  --shadow-glow: 0 0 30px rgba(50, 80, 109, 0.12);

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-base: 0.25s ease;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: "Times New Roman", "SimSun", "Songti SC", serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: inherit;
  color: inherit;
  background-color: inherit;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* ==========================================================================
   Chinese Typography Enforcement - Strict Project Constraint: 中文用宋体
   ========================================================================== */
html[lang*="zh"],
html[lang*="zh"] body,
body[data-lang*="zh"],
body.lang-zh,
:lang(zh),
:lang(zh-CN),
:lang(zh-TW),
.lang-zh {
  font-family: "SimSun", "Songti SC", "Songti TC", "STSong", "NSimSun", "Times New Roman", serif !important;
}

html[lang*="zh"] button,
html[lang*="zh"] input,
html[lang*="zh"] select,
html[lang*="zh"] textarea,
html[lang*="zh"] .btn,
html[lang*="zh"] .nav-link,
html[lang*="zh"] .nav-item,
html[lang*="zh"] .channel-card,
html[lang*="zh"] .portal-cta,
html[lang*="zh"] .hero-headline,
html[lang*="zh"] .section-title,
html[lang*="zh"] .comp-title,
html[lang*="zh"] .flowline-title,
html[lang*="zh"] .tk-headline,
html[lang*="zh"] .meta-value,
html[lang*="zh"] .hero-subtext,
html[lang*="zh"] .about-editorial-spread,
html[lang*="zh"] .principle-card,
html[lang*="zh"] .flowline-container-card,
html[lang*="zh"] .tk-spotlight-frame,
html[lang*="zh"] .verification-card,
html[lang*="zh"] .gateway-card {
  font-family: "SimSun", "Songti SC", "Songti TC", "STSong", "NSimSun", "Times New Roman", serif !important;
}

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

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

ul {
  list-style: none;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

/* Focus Visible for Accessibility */
:focus-visible {
  outline: 2px solid var(--accent-slate);
  outline-offset: 3px;
}

/* Utilities */
.text-center { text-align: center; }
.text-slate { color: var(--accent-slate) !important; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-36 { margin-top: 36px; }
.mt-48 { margin-top: 48px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  min-height: 48px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
}

.btn-primary:hover {
  background-color: #2b2e29;
  border-color: #2b2e29;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(21, 23, 20, 0.15);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--text-primary);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px) scale(0.99);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 16px;
  min-height: 38px;
}

/* Section Header Typography */
.section-header {
  margin-bottom: 56px;
  max-width: 860px;
}

.section-kicker {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-slate);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(30px, 3.4vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.section-lead {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ==========================================================================
   Interactive Spotlight Glow (Mercury / Apple Style)
   ========================================================================== */
.spot-glow {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

@media (hover: hover) and (pointer: fine) {
  .spot-glow:hover {
    border-color: rgba(50, 80, 109, 0.28);
    box-shadow: 0 8px 28px rgba(21, 23, 20, 0.06), 0 0 20px rgba(50, 80, 109, 0.05);
  }
}

/* ==========================================================================
   Header & Multi-Language Switcher (Aligned with transparencyking.com)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(251, 250, 248, 0.94);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  background-color: rgba(251, 250, 248, 0.98);
  border-bottom-color: rgba(21, 23, 20, 0.08);
  box-shadow: 0 4px 20px rgba(21, 23, 20, 0.05);
}

.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-shrink: 0;
}

.brand-mark {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-fullname {
  font-size: 15px;
  color: var(--text-tertiary);
  display: inline-block;
}

/* Center Navigation */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-item {
  font-size: 17px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 6px 0;
  white-space: nowrap;
}

.nav-item:hover, .nav-item.active {
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

/* Multi-Language Dropdown Switcher */
.language-switcher {
  position: relative;
  display: inline-block;
}

.lang-summary {
  list-style: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  min-height: 38px;
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
}

.lang-summary::-webkit-details-marker {
  display: none;
}

.lang-summary:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

.globe-icon {
  font-size: 16px;
  line-height: 1;
}

.arrow {
  font-size: 14px;
  transition: transform var(--transition-fast);
}

.language-switcher[open] .arrow {
  transform: rotate(180deg);
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 250px;
  max-height: 380px;
  overflow-y: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(21, 23, 20, 0.12);
  padding: 6px;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lang-opt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  background: transparent;
  border: none;
  text-decoration: none;
  font-size: 15px;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-fast);
}

.lang-opt:hover {
  background: var(--bg-subtle);
}

.lang-opt.active {
  background: var(--accent-slate-subtle);
  font-weight: 700;
  color: var(--accent-slate);
}

.lang-opt small {
  font-size: 14px;
  color: var(--text-tertiary);
  background: rgba(21, 23, 20, 0.05);
  padding: 2px 6px;
  border-radius: 3px;
}

.nav-action-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--accent-slate);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.nav-action-link:hover {
  background-color: var(--accent-slate-subtle);
  color: var(--accent-slate-hover);
}

.mobile-nav-actions {
  display: none;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-sm);
}

.toggle-bar {
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ==========================================================================
   1. Hero Section: Cinematic Visuals & Dynamic Optical Atmosphere
   ========================================================================== */
.section-hero {
  position: relative;
  padding: 84px 0 96px 0;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.hero-ambient-glow {
  position: absolute;
  top: -120px;
  right: 0;
  width: min(600px, 100%);
  height: 600px;
  background: radial-gradient(circle at 100% 0%, rgba(50, 80, 109, 0.08) 0%, rgba(251, 250, 248, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 60px;
}

.hero-live-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.live-dot {
  width: 7px;
  height: 7px;
  background-color: #2b9348;
  border-radius: 50%;
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-eyebrow {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.hero-headline {
  font-size: clamp(38px, 4.4vw, 56px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 22px;
}

.headline-line {
  display: block;
}

.headline-italic {
  font-style: italic;
  font-weight: 400;
  color: var(--accent-slate);
}

.hero-subtext {
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.hero-meta-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.meta-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

/* Hero Visual Frame & Tilt */
.hero-visual-frame {
  position: relative;
  perspective: 1000px;
}

.visual-surface {
  position: relative;
  background-color: #f7f6f1;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 16px 44px rgba(21, 23, 20, 0.08);
  transition: transform 0.25s ease-out, box-shadow 0.25s ease-out;
}

.hero-image {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  display: block;
}

.glass-reflection {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.16) 0%, rgba(255, 255, 255, 0) 60%);
  pointer-events: none;
}

/* Pinned Spec Hotspots */
.spec-hotspot {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(21, 23, 20, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  z-index: 2;
  transition: transform var(--transition-fast);
}

.hotspot-top {
  top: 14%;
  left: 10%;
}

.hotspot-bottom {
  bottom: 14%;
  right: 10%;
}

.hotspot-pulse {
  width: 7px;
  height: 7px;
  background-color: #60a5fa;
  border-radius: 50%;
  box-shadow: 0 0 8px #60a5fa;
}

.hotspot-tag {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.visual-caption {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-top: 12px;
  padding-left: 4px;
}

.caption-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-slate);
}

/* ==========================================================================
   2. About Section: Asymmetric Editorial Spread
   ========================================================================== */
.section-about {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.about-editorial-spread {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: start;
}

.lead-editorial-para {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.operational-structure-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 36px;
  margin-top: 36px;
  box-shadow: var(--shadow-subtle);
}

.struct-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.struct-pipeline {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.struct-step {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.step-badge {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-slate);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.step-entity {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.step-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.55;
}

.struct-divider {
  height: 1px;
  background-color: var(--border-subtle);
}

.about-photo-card {
  padding: 16px;
}

.about-photo-wrapper {
  background-color: #f3f1ec;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.about-photo-img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.about-photo-annotation {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-top: 14px;
  line-height: 1.5;
}

.annotation-bullet {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--text-tertiary);
  flex-shrink: 0;
  transform: translateY(-2px);
}

/* ==========================================================================
   3. Mobile Accessories: Precision Engineering & Material Comparison
   ========================================================================== */
.section-accessories {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.accessories-layout-spread {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
  align-items: center;
}

.acc-photo-frame {
  padding: 16px;
}

.acc-img-shell {
  background-color: #eef0f3;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.acc-hero-img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.acc-photo-caption {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-top: 14px;
}

.caption-marker {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-slate);
}

.acc-editorial-col {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.feature-item-editorial {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.feat-header-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 8px;
}

.feat-num {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-slate);
}

.feat-heading {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.feat-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.acc-cta-box {
  padding-top: 8px;
}

.link-editorial {
  font-size: 17px;
  font-weight: 700;
  color: var(--accent-slate);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.link-editorial:hover {
  color: var(--accent-slate-hover);
  text-decoration: underline;
}

/* Material Comparison Box (Apple / Tesla / ASML Style) */
.material-comparison-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 40px;
  box-shadow: var(--shadow-subtle);
}

.comparison-header {
  margin-bottom: 28px;
}

.comparison-kicker {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 6px;
}

.comparison-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comp-card {
  padding: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.comp-card-noda {
  background: #fbfdff;
  border-color: var(--accent-slate-border);
}

.comp-card-commodity {
  background: #fafaf8;
  opacity: 0.85;
}

.comp-card-badge {
  display: inline-block;
  padding: 4px 10px;
  background: var(--accent-slate);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}

.comp-badge-dim {
  background: #8e908b;
}

.comp-specs {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.comp-specs li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.5;
  border-bottom: 1px dashed rgba(21, 23, 20, 0.08);
  padding-bottom: 8px;
}

.comp-specs li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

/* ==========================================================================
   4. Trade & Export Services: Principles & Milestone Flowline
   ========================================================================== */
.section-export {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.export-principles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.principle-card {
  padding: 28px 24px;
}

.principle-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.35;
}

.principle-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Connected Milestone Flowline */
.flowline-container-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 44px;
  box-shadow: var(--shadow-subtle);
}

.flowline-header {
  margin-bottom: 36px;
}

.flowline-kicker {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 8px;
}

.flowline-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.015em;
  margin-bottom: 8px;
}

.flowline-sub {
  font-size: 17px;
  color: var(--text-secondary);
}

.milestones-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.milestones-track::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 30px;
  right: 30px;
  height: 2px;
  background-color: var(--border-medium);
  z-index: 0;
}

.milestone-node {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 24px 20px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.milestone-node:hover {
  transform: translateY(-2px);
  border-color: var(--accent-slate);
}

.milestone-badge {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-slate);
  background: var(--accent-slate-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.milestone-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.milestone-body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.55;
}

.flowline-disclaimer {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px dashed var(--border-subtle);
}

.flowline-disclaimer p {
  font-size: 14px;
  color: var(--text-tertiary);
  margin: 0;
}

/* ==========================================================================
   5. Transparency King Spotlight: Interactive Showcase & Lens Magnifier
   ========================================================================== */
.section-tk-spotlight {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.tk-spotlight-frame {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 60px;
  box-shadow: var(--shadow-medium);
}

.tk-spotlight-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.tk-badge-pill {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-slate);
  background-color: var(--accent-slate-subtle);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tk-headline {
  font-size: clamp(34px, 3.8vw, 48px);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.tk-tagline {
  font-size: 18px;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.tk-description {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.tk-specs-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.spec-card {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 18px;
}

.spec-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.spec-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.compatibility-pill-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding: 12px 16px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
}

.compat-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.compat-pill {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: #ffffff;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
}

.tk-portal-action {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Tab Segmented Controls */
.tab-controls-segmented {
  display: flex;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 4px;
  margin-bottom: 24px;
  gap: 4px;
}

.tab-segment {
  flex: 1;
  background: transparent;
  border: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-segment.active {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.gallery-view-port {
  position: relative;
  background-color: #faf9f6;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 18px;
  box-shadow: var(--shadow-subtle);
}

.cutout-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  transition: opacity 0.22s ease-out;
}

.gallery-info-card {
  padding: 12px 4px;
}

.gallery-info-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.gallery-info-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.tk-disclaimer-strip {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.tk-disclaimer-strip p {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.5;
  margin: 0;
}

/* ==========================================================================
   6. Operational Fundamentals: Measured Data & Legal Credentials
   ========================================================================== */
.section-verification {
  padding: 100px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.verification-grid-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

.tech-panel {
  padding: 36px;
}

.tech-panel-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.tech-block {
  margin-bottom: 28px;
}

.tech-block:last-child {
  margin-bottom: 0;
}

.tech-subheading {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 4px;
}

.tech-subnote {
  font-size: 15px;
  color: var(--accent-slate);
  margin-bottom: 10px;
  font-weight: 500;
}

.tech-body {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.tech-compliance-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.comp-tag {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-slate);
  background-color: var(--accent-slate-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-slate-border);
}

.ver-footnote {
  font-size: 14px;
  color: var(--text-tertiary);
  font-style: italic;
  margin-top: 6px;
}

.ver-specs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.ver-specs-list li {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.ver-specs-list li strong {
  color: var(--text-primary);
}

.carton-specs-mini {
  background-color: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.carton-spec-row {
  display: flex;
  justify-content: space-between;
  font-size: 15px;
}

.c-label {
  font-weight: 700;
  color: var(--text-primary);
}

.c-val {
  color: var(--text-secondary);
}

/* Verified Credential Footnote Bar */
.verification-credential-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  padding: 14px 28px;
  box-shadow: var(--shadow-subtle);
}

.cred-banner-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-slate);
}

.cred-banner-details {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ==========================================================================
   7. Direct Procurement Gateway & Fast Commercial Channels Hub
   (Replaces form with high-impact, high-conversion gateway)
   ========================================================================== */
.section-contact {
  padding: 110px 0;
  background: linear-gradient(180deg, var(--bg-primary) 0%, #f4f3ed 100%);
  border-bottom: 1px solid var(--border-subtle);
}

.gateway-header {
  margin-bottom: 48px;
}

.gateway-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: stretch;
}

.gateway-card {
  padding: 44px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.gateway-card-portal {
  background: #ffffff;
  border: 1px solid var(--accent-slate-border);
  box-shadow: 0 8px 30px rgba(50, 80, 109, 0.08);
}

.gateway-badge {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-slate);
  background: var(--accent-slate-subtle);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.gateway-card-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.015em;
}

.gateway-card-text {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.portal-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  padding: 16px 20px;
  background: #fbfbf9;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.p-feat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 500;
}

.p-feat-icon {
  color: #2b9348;
  font-weight: 700;
}

.gateway-card-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Fast Commercial Channels */
.channels-action-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.channel-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  cursor: pointer;
  min-height: 52px;
  transition: all var(--transition-fast);
}

.channel-btn:hover {
  border-color: var(--accent-slate);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(21, 23, 20, 0.05);
}

.ch-icon {
  font-size: 20px;
  margin-right: 14px;
}

.ch-info {
  display: flex;
  flex-direction: column;
  flex: 1;
  text-align: left;
}

.ch-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.ch-val {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}

.ch-arrow {
  font-size: 16px;
  color: var(--accent-slate);
}

.ch-copy-badge {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  background: var(--accent-slate);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  transition: background var(--transition-fast);
}

.gateway-address-box {
  padding: 14px 18px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  font-size: 15px;
  line-height: 1.5;
}

.gw-addr-label {
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: 2px;
}

.gw-addr-val {
  color: var(--text-secondary);
}

.coordination-notice {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.5;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--text-primary);
  color: #c9cbbf;
  padding: 80px 0 40px 0;
  border-top: 1px solid #282b26;
}

.footer-top-row {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
  gap: 40px;
  padding-bottom: 52px;
  border-bottom: 1px solid #2b2e29;
}

.footer-brand-mark {
  font-size: 26px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.footer-legal-name {
  font-size: 16px;
  color: #ffffff;
  margin-bottom: 4px;
}

.footer-legal-zh {
  font-size: 15px;
  color: #b8bcb1;
  margin-bottom: 12px;
}

.footer-credit-code {
  font-size: 14px;
  color: #8c9085;
}

.footer-heading {
  display: block;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 16px;
  color: #b8bcb1;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-contact-line {
  font-size: 16px;
  color: #b8bcb1;
  margin-bottom: 8px;
}

.footer-contact-line a {
  color: #ffffff;
}

.footer-bottom-row {
  padding-top: 36px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  font-size: 14px;
  color: #7b8076;
}

.footer-disclaimer {
  max-width: 680px;
  text-align: right;
  line-height: 1.45;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .about-editorial-spread {
    grid-template-columns: 1fr;
  }

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

  .export-principles-grid {
    grid-template-columns: 1fr 1fr;
  }

  .milestones-track {
    grid-template-columns: 1fr 1fr;
  }

  .milestones-track::before {
    display: none;
  }

  .tk-spotlight-grid {
    grid-template-columns: 1fr;
  }

  .verification-grid-two-col {
    grid-template-columns: 1fr;
  }

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

  .footer-top-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }

  .brand-fullname {
    display: none;
  }

  .primary-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
    display: none;
  }

  .primary-nav.is-open {
    display: flex;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav-action-link {
    display: none;
  }

  .mobile-nav-actions {
    display: block;
    width: 100%;
    padding-top: 12px;
    border-top: 1px solid var(--border-subtle);
  }

  .export-principles-grid {
    grid-template-columns: 1fr;
  }

  .milestones-track {
    grid-template-columns: 1fr;
  }

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

  .tk-specs-matrix {
    grid-template-columns: 1fr;
  }

  .tk-spotlight-frame {
    padding: 32px 20px;
  }

  .verification-credential-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    border-radius: var(--radius-md);
  }

  .cred-banner-details {
    flex-direction: column;
    gap: 4px;
  }

  .footer-top-row {
    grid-template-columns: 1fr;
  }

  .footer-bottom-row {
    flex-direction: column;
    text-align: left;
  }

  .footer-disclaimer {
    text-align: left;
  }
}

/* ==========================================================================
   Interactive Product Angle Selector & Refined Visual Styles
   ========================================================================== */
.angle-selector-strip {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.angle-thumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.angle-thumb img {
  width: 24px;
  height: 24px;
  object-fit: cover;
  border-radius: 2px;
}

.angle-thumb span {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

.angle-thumb:hover {
  border-color: var(--accent-slate);
  background: var(--accent-slate-subtle);
}

.angle-thumb.active {
  border-color: var(--accent-slate);
  background: var(--accent-slate-subtle);
  box-shadow: 0 0 0 1px var(--accent-slate);
}

.angle-thumb.active span {
  color: var(--accent-slate);
  font-weight: 700;
}

/* Concentric Hotspot Pulse */
.hotspot-pulse {
  position: relative;
  width: 8px;
  height: 8px;
  background-color: #3b82f6;
  border-radius: 50%;
}

.hotspot-pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1.5px solid rgba(59, 130, 246, 0.7);
  animation: hotspotRing 2.2s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

@keyframes hotspotRing {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* High-Conversion Channel Copy Tooltip */
.ch-copy-badge {
  font-size: 14px;
  font-weight: 600;
  padding: 4px 8px;
  background: rgba(21, 23, 20, 0.06);
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
}