/* ============================================================
   Shandong Lujun Automobile Manufacturing Co., Ltd.
   Xin Lujun Brand (鑫鲁骏牌) - Semi-Trailer Manufacturer
   Professional Foreign Trade Website Stylesheet
   ============================================================
   Table of Contents:
   1.  Font Imports & CSS Variables
   2.  Reset & Base Styles
   3.  Typography
   4.  Layout Utilities
   5.  Header & Navigation
   6.  Hero Section
   7.  About Section
   8.  Products Grid
   9.  Product Detail (Single Product Page)
   10. Stats & Certifications Section
   11. Features & Advantages Section
   12. Contact Section
   13. Contact Form Styles
   14. Product Specs Table
   15. Modal / Lightbox
   16. Footer
   17. Page-Specific Styles
   18. Animations
   19. Custom Scrollbar
   20. Responsive Breakpoints
   ============================================================ */

/* ============================================================
   1. FONT IMPORTS & CSS VARIABLES
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap");

:root {
  /* ---------- Brand Colors ---------- */
  --color-primary: #0a2744;
  --color-primary-light: #123a5e;
  --color-primary-dark: #061a2e;
  --color-accent: #c8a84e;
  --color-accent-light: #dcc47a;
  --color-accent-dark: #a88830;
  --color-white: #ffffff;
  --color-off-white: #f8f9fa;
  --color-gray-50: #f1f3f5;
  --color-gray-100: #e9ecef;
  --color-gray-200: #dee2e6;
  --color-gray-300: #ced4da;
  --color-gray-400: #adb5bd;
  --color-gray-500: #6c757d;
  --color-gray-600: #495057;
  --color-gray-700: #343a40;
  --color-gray-800: #212529;
  --color-gray-900: #1a1d20;
  --color-success: #2d6a4f;
  --color-warning: #e9a820;
  --color-error: #c41e3a;

  /* ---------- Typography ---------- */
  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif,
    "Apple Color Emoji", "Segoe UI Emoji";
  --font-chinese: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    "Noto Sans SC", sans-serif;
  --font-heading: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;

  /* ---------- Spacing ---------- */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  --spacing-5xl: 8rem;

  /* ---------- Layout ---------- */
  --max-width: 1200px;
  --header-height: 70px;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;

  /* ---------- Shadows ---------- */
  --shadow-sm: 0 1px 3px rgba(10, 39, 68, 0.08);
  --shadow-md: 0 4px 12px rgba(10, 39, 68, 0.12);
  --shadow-lg: 0 8px 30px rgba(10, 39, 68, 0.16);
  --shadow-xl: 0 12px 48px rgba(10, 39, 68, 0.2);
  --shadow-glow: 0 0 20px rgba(200, 168, 78, 0.3);

  /* ---------- Transitions ---------- */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* ---------- Z-Index Scale ---------- */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* ============================================================
   2. RESET & BASE STYLES
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
}

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

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 0;
}

::selection {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* ============================================================
   3. TYPOGRAPHY
   ============================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  font-weight: 600;
}

h4 {
  font-size: clamp(1.1rem, 1.5vw, 1.35rem);
  font-weight: 600;
}

h5 {
  font-size: 1.1rem;
  font-weight: 600;
}

h6 {
  font-size: 1rem;
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

/* Chinese text helper */
.zh {
  font-family: var(--font-chinese);
  letter-spacing: 0.02em;
}

/* Bilingual text block */
.bilingual h2 {
  margin-bottom: var(--spacing-sm);
}

.bilingual .zh-sub {
  display: block;
  font-family: var(--font-chinese);
  font-size: 0.85em;
  font-weight: 400;
  color: var(--color-gray-500);
  margin-top: var(--spacing-xs);
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  position: relative;
}

.section__title {
  margin-bottom: var(--spacing-sm);
}

.section__desc {
  font-size: 1.05rem;
  color: var(--color-gray-500);
  max-width: 600px;
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

/* Section header centering */
.section__header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section__header .section__desc {
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   4. LAYOUT UTILITIES
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container--narrow {
  max-width: 880px;
}

.container--wide {
  max-width: 1400px;
}

.section {
  padding: var(--spacing-4xl) 0;
}

.section--dark {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.section--dark .section__title {
  color: var(--color-white);
}

.section--dark .section__desc {
  color: var(--color-gray-400);
}

.section--gray {
  background-color: var(--color-off-white);
}

.section--accent {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 50%,
    var(--color-primary) 100%
  );
  color: var(--color-white);
}

.section-center {
  text-align: center;
}

.section-center .section__desc {
  margin-left: auto;
  margin-right: auto;
}

.grid {
  display: grid;
  gap: var(--spacing-xl);
}

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

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.flex {
  display: flex;
}

.flex--center {
  align-items: center;
  justify-content: center;
}

.flex--between {
  align-items: center;
  justify-content: space-between;
}

.flex--wrap {
  flex-wrap: wrap;
}

.gap-sm {
  gap: var(--spacing-sm);
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.gap-xl {
  gap: var(--spacing-xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  border: 2px solid var(--color-accent);
}

.btn--primary:hover {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn--outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn--outline-accent {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn--outline-accent:hover {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn--dark {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: 2px solid var(--color-primary);
}

.btn--dark:hover {
  background-color: transparent;
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn--lg {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.85rem;
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn--secondary:hover {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn--full {
  width: 100%;
}

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

/* Decorative elements */
.accent-line {
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
}

.accent-line--center {
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   5. HEADER & NAVIGATION
   ============================================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background-color: rgba(10, 39, 68, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(200, 168, 78, 0.15);
  transition: all var(--transition-base);
}

.header.scrolled {
  background-color: rgba(10, 39, 68, 0.98);
  box-shadow: var(--shadow-lg);
  border-bottom-color: rgba(200, 168, 78, 0.3);
}

/* Top Bar */
.header__top {
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0;
  font-size: 0.78rem;
}

.header__contact-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.header__contact-link,
.header__top-link {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.78rem;
}

.header__contact-link:hover,
.header__top-link:hover {
  color: var(--color-accent);
}

.header__lang {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.header__lang-link,
.header__top-link {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-gray-400);
  padding: 0.2rem 0.4rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.header__lang-link:hover,
.header__lang-link--active,
.header__top-link.active {
  color: var(--color-accent);
  background-color: rgba(200, 168, 78, 0.1);
}

.header__lang-sep {
  color: rgba(255, 255, 255, 0.2);
  font-size: 0.75rem;
}

/* Main Navigation */
.header__nav {
  height: var(--header-height);
}

.header__nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

.header__logo-img {
  height: 42px;
  width: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1.8rem;
}

.header__logo-text {
  display: flex;
  flex-direction: column;
}

.header__logo-title,
.header__logo-brand {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.header__logo-title span {
  color: var(--color-accent);
}

.header__logo-subtitle,
.header__logo-sub {
  font-family: var(--font-chinese);
  font-size: 0.7rem;
  color: var(--color-gray-400);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Main Navigation Menu */
.header__menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.header__menu-item {
  position: relative;
}

.header__menu-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-gray-300);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-base);
  position: relative;
}

.header__menu-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.header__menu-link:hover,
.header__menu-link--active {
  color: var(--color-accent);
  background-color: rgba(200, 168, 78, 0.08);
}

.header__menu-link:hover::after,
.header__menu-link--active::after {
  transform: scaleX(1);
}

/* Dropdown */
.header__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background-color: var(--color-white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
  padding: var(--spacing-sm) 0;
  margin-top: var(--spacing-sm);
}

.header__menu-item:hover .header__dropdown,
.header__menu-item:focus-within .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 24px;
  width: 12px;
  height: 12px;
  background-color: var(--color-white);
  transform: rotate(45deg);
  border-radius: 2px;
}

.header__dropdown-link {
  display: block;
  padding: 0.6rem 1.25rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-gray-700);
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.header__dropdown-link:hover {
  background-color: var(--color-off-white);
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  padding-left: 1.5rem;
}

.header__dropdown-link .zh {
  display: block;
  font-size: 0.78rem;
  color: var(--color-gray-400);
  margin-top: 2px;
}

/* Language Switcher */
.header__lang {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-left: var(--spacing-md);
  padding-left: var(--spacing-md);
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.header__lang-link,
.header__top-link {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-gray-400);
  padding: 0.2rem 0.4rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.header__lang-link:hover,
.header__lang-link--active,
.header__top-link.active {
  color: var(--color-accent);
  background-color: rgba(200, 168, 78, 0.1);
}

/* Hamburger Menu Toggle */
.header__hamburger,
.header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  z-index: var(--z-overlay);
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition-base);
  position: relative;
}

.header__hamburger span + span {
  margin-top: 6px;
}

.header__hamburger.active span:nth-child(1) {
  transform: rotate(45deg);
  top: 4px;
}

.header__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.header__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg);
  top: -4px;
}

/* Mobile Nav Overlay */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(10, 39, 68, 0.6);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav-overlay.active {
  opacity: 1;
}

/* ============================================================
   6. HERO SECTION
   ============================================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: var(--color-primary-dark);
}

.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    to right,
    rgba(10, 39, 68, 0.85) 0%,
    rgba(10, 39, 68, 0.6) 50%,
    rgba(10, 39, 68, 0.4) 100%
  );
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img,
.hero__bg-placeholder {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(10, 39, 68, 0.85) 0%,
    rgba(10, 39, 68, 0.6) 50%,
    rgba(10, 39, 68, 0.4) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  padding: 0 var(--spacing-lg);
  text-align: center;
}

.hero__content--left {
  text-align: left;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(200, 168, 78, 0.12);
  border: 1px solid rgba(200, 168, 78, 0.25);
  border-radius: 50px;
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.hero__title .highlight {
  color: var(--color-accent);
}

.hero__subtitle {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  color: var(--color-gray-300);
  max-width: 580px;
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
  font-weight: 300;
}

.hero__subtitle.hero__subtitle--center {
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

.hero__actions--center {
  justify-content: center;
}

.hero__stats {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: var(--spacing-2xl) 0;
  margin-top: auto;
}

.hero__stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  display: block;
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--color-gray-400);
  margin-top: var(--spacing-xs);
  display: block;
}

/* Hero Slider (if used) */
.hero-slider {
  position: absolute;
  inset: 0;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 39, 68, 0.85) 0%,
    rgba(10, 39, 68, 0.5) 100%
  );
}

.hero-dots {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 2;
}

.hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
}

.hero-dot.active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.2);
}

.hero-dot:hover {
  background-color: rgba(200, 168, 78, 0.5);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-gray-400);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  animation: float 2s ease-in-out infinite;
}

.scroll-indicator__mouse {
  width: 24px;
  height: 38px;
  border-radius: 12px;
  border: 2px solid var(--color-gray-400);
  position: relative;
}

.scroll-indicator__mouse::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
  animation: scrollWheel 1.5s ease-in-out infinite;
}

/* Alternate hero style: video bg */
.hero-video {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-video::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(10, 39, 68, 0.8) 0%,
    rgba(10, 39, 68, 0.4) 100%
  );
}

/* ============================================================
   7. ABOUT SECTION
   ============================================================ */

.about {
  position: relative;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about__text .about__para {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-lg);
}

.about__heading {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
}

/* Certification badges in about section */
.about__cert-badges {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.about__badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: rgba(200, 168, 78, 0.08);
  border: 1px solid rgba(200, 168, 78, 0.2);
  border-radius: var(--border-radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
}

.about__badge i {
  color: var(--color-accent);
  font-size: 1rem;
}

/* About media column */
.about__media {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.about__image {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  min-height: 300px;
  background-color: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about__image-placeholder {
  width: 100%;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--color-gray-400);
}

.about__stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.about__stat-card {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--color-off-white);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-gray-100);
}

.about__stat-card i {
  font-size: 1.4rem;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

.about__stat-val {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.about__stat-lbl {
  display: block;
  font-size: 0.75rem;
  color: var(--color-gray-500);
  margin-top: 2px;
}

/* ============================================================
   8. PRODUCTS GRID
   ============================================================ */

.products-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.products-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.filter-btn {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-gray-500);
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: 50px;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.filter-btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.filter-btn.active {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  border-color: var(--color-accent);
}

.products-grid,
.products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.product-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.product-card__image {
  position: relative;
  height: 220px;
  overflow: hidden;
  background-color: var(--color-gray-50);
}

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

.product-card:hover .product-card__image img {
  transform: scale(1.08);
}

.product-card__badge {
  position: absolute;
  top: var(--spacing-sm);
  left: var(--spacing-sm);
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.55rem;
  border-radius: var(--border-radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.product-card__body {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card__category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

.product-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

.product-card__title .zh {
  display: block;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--color-gray-500);
  margin-top: 2px;
}

.product-card__desc {
  font-size: 0.88rem;
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-lg);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-gray-100);
}

.product-card__specs {
  display: flex;
  gap: var(--spacing-lg);
}

.product-card__spec {
  text-align: center;
}

.product-card__spec-value {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.product-card__spec-label {
  font-size: 0.65rem;
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.product-card__link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: gap var(--transition-fast);
}

.product-card__link:hover {
  gap: var(--spacing-sm);
}

/* ============================================================
   9. PRODUCT DETAIL (SINGLE PRODUCT PAGE)
   ============================================================ */

.product-detail {
  padding-top: calc(var(--header-height) + var(--spacing-2xl));
}

.product-detail__breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-gray-400);
  margin-bottom: var(--spacing-2xl);
}

.product-detail__breadcrumb a {
  color: var(--color-gray-500);
}

.product-detail__breadcrumb a:hover {
  color: var(--color-accent);
}

.product-detail__breadcrumb .separator {
  color: var(--color-gray-300);
}

.product-detail__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

/* Gallery */
.product-gallery {
  position: relative;
}

.product-gallery__main {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background-color: var(--color-gray-50);
  margin-bottom: var(--spacing-md);
  cursor: zoom-in;
  position: relative;
}

.product-gallery__main img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.product-gallery__main:hover img {
  transform: scale(1.03);
}

.product-gallery__thumbs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-sm);
}

.product-gallery__thumb {
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color var(--transition-fast);
  opacity: 0.6;
}

.product-gallery__thumb.active,
.product-gallery__thumb:hover {
  border-color: var(--color-accent);
  opacity: 1;
}

.product-gallery__thumb img {
  width: 100%;
  height: 80px;
  object-fit: cover;
}

/* Product info */
.product-info__title {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.product-info__title .zh {
  display: block;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-md);
}

.product-info__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--color-off-white);
  border-radius: var(--border-radius-md);
}

.product-info__meta-item {
  text-align: center;
  flex: 1;
  min-width: 80px;
}

.product-info__meta-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.product-info__meta-label {
  font-size: 0.72rem;
  color: var(--color-gray-500);
  margin-top: var(--spacing-xs);
}

.product-info__description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-xl);
}

.product-info__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

/* Product detail tabs */
.product-tabs {
  margin-top: var(--spacing-3xl);
}

.product-tabs__nav {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-gray-200);
  margin-bottom: var(--spacing-xl);
  overflow-x: auto;
}

.product-tabs__btn {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gray-500);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.product-tabs__btn:hover {
  color: var(--color-primary);
}

.product-tabs__btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.product-tabs__panel {
  display: none;
}

.product-tabs__panel.active {
  display: block;
}

/* Related products section in product detail */
.related-products {
  margin-top: var(--spacing-4xl);
  padding-top: var(--spacing-3xl);
  border-top: 1px solid var(--color-gray-200);
}

/* ============================================================
   10. STATS & CERTIFICATIONS SECTION
   ============================================================ */

.stats {
  position: relative;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 100%
  );
  overflow: hidden;
}

.stats::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(
    circle at 20% 50%,
    rgba(200, 168, 78, 0.06) 0%,
    transparent 50%
  );
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.stat-item {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 60%;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(200, 168, 78, 0.3),
    transparent
  );
}

.stat-item__icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  display: block;
}

.stat-item__number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.stat-item__number .suffix {
  font-size: 1.4rem;
  color: var(--color-accent);
}

.stat-item__label {
  font-size: 0.9rem;
  color: var(--color-gray-400);
  font-weight: 400;
}

.stat-item__label .zh {
  display: block;
  font-size: 0.8rem;
  margin-top: 2px;
}

/* Certifications badges */
.certifications {
  padding: var(--spacing-3xl) 0;
}

.cert-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-2xl);
}

.cert-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  text-align: center;
}

.cert-item img {
  height: 60px;
  width: auto;
  opacity: 0.8;
  transition: opacity var(--transition-base);
}

.cert-item:hover img {
  opacity: 1;
}

.cert-item__label {
  font-size: 0.78rem;
  color: var(--color-gray-500);
  font-weight: 500;
}

/* Quality grid (index.html) */
.quality__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.quality__card {
  background-color: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition-base);
  text-align: center;
}

.quality__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.quality__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(200, 168, 78, 0.1);
  border-radius: var(--border-radius-md);
  color: var(--color-accent);
  font-size: 1.6rem;
  transition: all var(--transition-base);
}

.quality__card:hover .quality__icon {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.quality__title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.quality__desc {
  font-size: 0.88rem;
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ============================================================
   11. FEATURES & ADVANTAGES / WHY CHOOSE US SECTION
   ============================================================ */

.features,
.why {
  background-color: var(--color-off-white);
}

.features-grid,
.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature-card,
.why__feature {
  background-color: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before,
.why__feature::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    to right,
    var(--color-accent),
    var(--color-accent-light)
  );
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.feature-card:hover,
.why__feature:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.feature-card:hover::before,
.why__feature:hover::before {
  transform: scaleX(1);
}

.feature-card__icon,
.why__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(200, 168, 78, 0.1);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-lg);
  color: var(--color-accent);
  font-size: 1.5rem;
  transition: all var(--transition-base);
}

.feature-card:hover .feature-card__icon,
.why__feature:hover .why__icon {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.feature-card__title,
.why__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-card__desc,
.why__desc {
  font-size: 0.88rem;
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ============================================================
   12. CONTACT SECTION
   ============================================================ */

.contact {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 60%,
    var(--color-primary) 100%
  );
  position: relative;
  overflow: hidden;
}

.contact::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -30%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(200, 168, 78, 0.05) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.contact::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(200, 168, 78, 0.03) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  position: relative;
  z-index: 1;
}

.contact__info {
  color: var(--color-white);
}

.contact__info .section__title {
  color: var(--color-white);
}

.contact__info .section__desc {
  color: var(--color-gray-400);
}

.contact__card {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.contact__card-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(200, 168, 78, 0.12);
  border-radius: var(--border-radius-md);
  color: var(--color-accent);
  font-size: 1.1rem;
}

.contact__card-body h4 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 2px;
}

.contact__card-body p {
  font-size: 0.85rem;
  color: var(--color-gray-400);
  margin-bottom: 0;
}

.contact__card-body a {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.contact__card-body a:hover {
  color: var(--color-accent);
}

/* ============================================================
   13. CONTACT FORM STYLES
   ============================================================ */

.contact-form-wrapper,
.contact__form-wrap {
  background-color: var(--color-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-xl);
}

.contact-form-wrapper h3,
.contact__form-wrap h3 {
  margin-bottom: var(--spacing-lg);
}

.form-group,
.contact__form-group,
.contact-form__group {
  margin-bottom: var(--spacing-lg);
}

.form-label,
.contact__label,
.contact-form__label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-xs);
}

.form-label .required,
.contact__label .required,
.contact-form__required {
  color: var(--color-error);
  margin-left: 2px;
}

.form-input,
.form-textarea,
.form-select,
.contact__input,
.contact__textarea,
.contact-form__input,
.contact-form__textarea,
.contact-form__select {
  width: 100%;
  padding: 0.7rem 1rem;
  font-size: 0.95rem;
  color: var(--color-gray-800);
  background-color: var(--color-off-white);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.form-input:hover,
.form-textarea:hover,
.form-select:hover,
.contact__input:hover,
.contact__textarea:hover,
.contact-form__input:hover,
.contact-form__textarea:hover {
  border-color: var(--color-gray-300);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus,
.contact__input:focus,
.contact__textarea:focus,
.contact-form__input:focus,
.contact-form__textarea:focus {
  border-color: var(--color-accent);
  background-color: var(--color-white);
  box-shadow: 0 0 0 3px rgba(200, 168, 78, 0.1);
  outline: none;
}

.form-input.error,
.form-textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.1);
}

.form-textarea,
.contact__textarea,
.contact-form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form-select,
.contact-form__select {
  appearance: none;
  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 fill='%23495057' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-row,
.contact__form-row,
.contact-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.form-error {
  display: none;
  font-size: 0.78rem;
  color: var(--color-error);
  margin-top: var(--spacing-xs);
}

.form-input.error ~ .form-error,
.form-textarea.error ~ .form-error {
  display: block;
}

.form-submit,
.contact-form__submit {
  width: 100%;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: var(--color-accent);
  border: 2px solid var(--color-accent);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.form-submit:hover,
.contact-form__submit:hover {
  background-color: transparent;
  color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--spacing-2xl);
}

.form-success.active {
  display: block;
}

.form-success__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  background-color: var(--color-success);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.form-success h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-sm);
}

.form-success p {
  color: var(--color-gray-500);
}

/* ============================================================
   14. PRODUCT SPECS TABLE
   ============================================================ */

.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.specs-table thead {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.specs-table th {
  padding: 0.85rem 1.25rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.specs-table td {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--color-gray-100);
  color: var(--color-gray-700);
}

.specs-table tbody tr {
  transition: background-color var(--transition-fast);
}

.specs-table tbody tr:hover {
  background-color: rgba(200, 168, 78, 0.05);
}

.specs-table tbody tr:nth-child(even) {
  background-color: var(--color-off-white);
}

.specs-table tbody tr:nth-child(even):hover {
  background-color: rgba(200, 168, 78, 0.08);
}

.specs-table .zh {
  display: block;
  font-size: 0.8rem;
  color: var(--color-gray-400);
  margin-top: 2px;
}

/* Responsive table wrapper */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: var(--spacing-xl);
}

.table-responsive::-webkit-scrollbar {
  height: 6px;
}

.table-responsive::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: 3px;
}

.table-responsive::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: 3px;
}

.table-responsive::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* ============================================================
   15. MODAL / LIGHTBOX
   ============================================================ */

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(10, 39, 68, 0.9);
  z-index: var(--z-modal);
  justify-content: center;
  align-items: center;
  padding: var(--spacing-lg);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-overlay.active {
  display: flex;
}

.modal {
  position: relative;
  max-width: 900px;
  width: 100%;
  background-color: var(--color-white);
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  animation: modalIn 0.3s ease;
}

.modal--lightbox {
  background: transparent;
  box-shadow: none;
  max-width: 1100px;
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 50%;
  color: var(--color-white);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 1;
  border: none;
}

.modal-close:hover {
  background-color: var(--color-error);
  transform: rotate(90deg);
}

.modal-body {
  position: relative;
}

.modal-body img {
  width: 100%;
  max-height: 80vh;
  object-fit: contain;
}

/* Lightbox navigation */
.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.2rem;
  border: 2px solid rgba(255, 255, 255, 0.2);
  z-index: 1;
}

.lightbox-nav:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-primary-dark);
}

.lightbox-nav--prev {
  left: var(--spacing-md);
}

.lightbox-nav--next {
  right: var(--spacing-md);
}

.lightbox-counter {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-white);
  font-size: 0.85rem;
  font-weight: 500;
  background-color: rgba(0, 0, 0, 0.5);
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
}

/* Modal content (for quick inquiry etc) */
.modal-content {
  padding: var(--spacing-2xl);
}

.modal-content h2 {
  margin-bottom: var(--spacing-sm);
}

.modal-content .section__desc {
  margin-bottom: var(--spacing-xl);
}

/* ============================================================
   16. FOOTER
   ============================================================ */

.footer {
  background-color: var(--color-primary-dark);
  color: var(--color-gray-400);
  position: relative;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    to right,
    transparent,
    var(--color-accent),
    transparent
  );
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-2xl);
  padding: var(--spacing-4xl) 0 var(--spacing-3xl);
}

/* Brand column */
.footer__brand {
  margin-bottom: var(--spacing-md);
}

.footer__logo {
  color: var(--color-accent);
  font-size: 1.6rem;
  margin-bottom: var(--spacing-sm);
}

.footer__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 2px;
}

.footer__brand-name {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 600;
}

.footer__desc,
.footer__text {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-top: var(--spacing-md);
  color: var(--color-gray-500);
}

/* Footer heading (column titles) */
.footer__heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer__heading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--color-accent);
}

/* Social links */
.footer__social {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.footer__social-link {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.06);
  border-radius: var(--border-radius-md);
  color: var(--color-gray-400);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.footer__social-link:hover {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

/* Quick links */
.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  list-style: none;
}

.footer__links a {
  font-size: 0.88rem;
  color: var(--color-gray-400);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer__links a::before {
  content: ">";
  font-size: 0.7rem;
  color: var(--color-accent);
  opacity: 0;
  transition: all var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer__links a:hover::before {
  opacity: 1;
}

/* Contact list */
.footer__contact {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  list-style: none;
}

.footer__contact li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  font-size: 0.85rem;
}

.footer__contact i {
  color: var(--color-accent);
  font-size: 0.9rem;
  margin-top: 2px;
  flex-shrink: 0;
}

.footer__contact a {
  color: var(--color-gray-400);
}

.footer__contact a:hover {
  color: var(--color-accent);
}

/* Footer bottom bar */
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--spacing-lg) 0;
}

.footer__bottom .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: 0.82rem;
}

.footer__copyright {
  color: var(--color-gray-500);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-base);
  z-index: var(--z-sticky);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-accent-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

/* ============================================================
   17. PAGE-SPECIFIC STYLES
   ============================================================ */

/* ---------- Page Banner (inner pages) ---------- */
.page-banner {
  position: relative;
  padding: calc(var(--header-height) + var(--spacing-4xl)) 0 var(--spacing-4xl);
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 100%
  );
  text-align: center;
  overflow: hidden;
}

.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='rgba(200,168,78,0.04)' stroke-width='1'/%3E%3C/svg%3E");
  background-size: 60px 60px;
}

.page-banner__title {
  color: var(--color-white);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  position: relative;
  z-index: 1;
}

.page-banner__subtitle {
  color: var(--color-gray-400);
  font-size: 1.05rem;
  margin-top: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.page-banner__breadcrumb {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  font-size: 0.85rem;
  color: var(--color-gray-400);
  margin-top: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.page-banner__breadcrumb a {
  color: var(--color-gray-400);
}

.page-banner__breadcrumb a:hover {
  color: var(--color-accent);
}

.page-banner__breadcrumb .separator {
  color: var(--color-gray-600);
}

/* ---------- About Page ---------- */
.about-page {
  padding-top: calc(var(--header-height) + var(--spacing-2xl));
}

.about-page__story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-page__story-image {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  position: relative;
}

.about-page__story-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.about-page__story-image .experience-badge {
  position: absolute;
  bottom: var(--spacing-lg);
  left: var(--spacing-lg);
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  text-align: center;
  font-weight: 700;
}

.about-page__story-image .experience-badge span {
  display: block;
  font-size: 2rem;
  line-height: 1;
}

.about-page__values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.value-card {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-base);
}

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

.value-card__icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

.value-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.value-card__desc {
  font-size: 0.85rem;
  color: var(--color-gray-500);
}

/* ---------- Contact Page ---------- */
.contact-page {
  padding-top: calc(var(--header-height) + var(--spacing-2xl));
}

.contact-page__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
}

.contact-page__map {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  height: 380px;
}

.contact-page__map iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ---------- Products Page ---------- */
.products-page {
  padding-top: calc(var(--header-height) + var(--spacing-2xl));
}

/* ---------- 404 Page ---------- */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  text-align: center;
  padding: var(--spacing-2xl);
}

.page-404__code {
  font-size: clamp(6rem, 12vw, 10rem);
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.04em;
}

.page-404__code span {
  color: var(--color-accent);
}

.page-404__title {
  font-size: 1.5rem;
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-lg);
}

/* ============================================================
   18. ANIMATIONS
   ============================================================ */

/* Fade In Up (for scroll-triggered reveals) */
.animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays */
.animate-delay-1 {
  transition-delay: 0.1s;
}
.animate-delay-2 {
  transition-delay: 0.2s;
}
.animate-delay-3 {
  transition-delay: 0.3s;
}
.animate-delay-4 {
  transition-delay: 0.4s;
}
.animate-delay-5 {
  transition-delay: 0.5s;
}

/* Fade In */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Fade In Up */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In Down */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In Left */
@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Fade In Right */
@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scale In */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Count-up number animation support */
@keyframes countUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Float animation (for scroll indicator) */
@keyframes float {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-8px);
  }
}

/* Scroll wheel animation */
@keyframes scrollWheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(12px);
  }
}

/* Modal entrance */
@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Pulsing glow (for CTA buttons) */
@keyframes pulseGlow {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(200, 168, 78, 0.4);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(200, 168, 78, 0);
  }
}

.btn--pulse {
  animation: pulseGlow 2s ease-in-out infinite;
}

/* Loading spinner */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

/* Skeleton loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-gray-100) 25%,
    var(--color-gray-50) 50%,
    var(--color-gray-100) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--border-radius-sm);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ============================================================
   19. CUSTOM SCROLLBAR
   ============================================================ */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-50);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: 4px;
  transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

::-webkit-scrollbar-thumb:active {
  background: var(--color-gray-500);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-gray-300) var(--color-gray-50);
}

/* ============================================================
   20. RESPONSIVE BREAKPOINTS
   ============================================================ */

/* ---------- Tablet: <= 1024px ---------- */
@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .about__grid,
  .about-page__story {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .about__image-placeholder {
    height: 340px;
  }

  .contact__grid,
  .contact-page__layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }

  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
  }

  .product-detail__layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
}

/* ---------- Large Mobile / Small Tablet: <= 768px ---------- */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .section {
    padding: var(--spacing-3xl) 0;
  }

  /* Header & Nav */
  .header__hamburger,
  .header__toggle {
    display: flex;
  }

  .header__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-primary-dark);
    flex-direction: column;
    padding: calc(var(--header-height) + var(--spacing-lg)) var(--spacing-lg)
      var(--spacing-lg);
    transition: right var(--transition-base);
    z-index: calc(var(--z-overlay) + 1);
    overflow-y: auto;
  }

  .header__menu.active {
    right: 0;
  }

  .header__menu {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  .header__menu-item {
    width: 100%;
  }

  .header__menu-link {
    width: 100%;
    padding: 0.75rem 0;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    justify-content: space-between;
  }

  .header__menu-link::after {
    display: none;
  }

  .header__dropdown {
    position: static;
    background-color: rgba(255, 255, 255, 0.04);
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xs) 0;
    margin-top: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), padding var(--transition-base);
  }

  .header__dropdown.open {
    max-height: 400px;
    padding: var(--spacing-xs) 0;
  }

  .header__dropdown::before {
    display: none;
  }

  .header__dropdown-link {
    color: var(--color-gray-300);
    padding: 0.5rem 1rem;
  }

  .header__dropdown-link .zh {
    color: var(--color-gray-500);
  }

  .header__lang {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-overlay {
    display: block;
  }

  /* Hero */
  .hero {
    min-height: 85vh;
  }

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

  .hero__actions {
    justify-content: center;
  }

  .hero__stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  /* Grids */
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .products-grid,
  .products__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .features-grid,
  .why__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }

  .stat-item:not(:last-child)::after {
    display: none;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .about-page__values {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

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

  .contact-form-wrapper,
  .contact__form-wrap {
    padding: var(--spacing-lg);
  }

  /* Product gallery */
  .product-gallery__main img {
    height: 280px;
  }

  .product-gallery__thumbs {
    grid-template-columns: repeat(4, 1fr);
  }

  .product-gallery__thumb img {
    height: 60px;
  }

  /* Product tabs */
  .product-tabs__nav {
    gap: 0;
  }

  .product-tabs__btn {
    font-size: 0.85rem;
    padding: 0.6rem 1rem;
  }

  /* Footer bottom */
  .footer__bottom .container {
    flex-direction: column;
    text-align: center;
  }

  /* Stats mini hero */
  .hero__stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
}

/* ---------- Small Mobile: <= 480px ---------- */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    min-height: 75vh;
  }

  .hero__title {
    font-size: 1.8rem;
  }

  .hero__stats-grid {
    display: none;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .stat-item__number {
    font-size: 2rem;
  }

  .stat-item {
    padding: var(--spacing-md);
  }

  .btn--lg {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
  }

  .header__logo-title,
  .header__logo-brand {
    font-size: 1rem;
  }

  .header__logo-img {
    height: 32px;
  }

  .product-card__image {
    height: 180px;
  }

  .page-banner {
    padding: calc(var(--header-height) + var(--spacing-2xl)) 0 var(--spacing-2xl);
  }

  .cert-item img {
    height: 44px;
  }

  .specs-table {
    font-size: 0.8rem;
  }

  .specs-table th,
  .specs-table td {
    padding: 0.6rem 0.8rem;
  }
}

/* ---------- Desktop Large: >= 1200px ---------- */
@media (min-width: 1200px) {
  .products-grid,
  .products__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero__content--left .hero__subtitle {
    max-width: 540px;
  }

  .container {
    padding: 0 var(--spacing-xl);
  }

  .feature-card,
  .why__feature {
    padding: var(--spacing-2xl);
  }
}

/* ---------- Print Styles ---------- */
@media print {
  .header,
  .footer,
  .hero__actions,
  .scroll-indicator,
  .header__hamburger,
  .header__toggle,
  .nav-overlay,
  .modal-overlay,
  .btn {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
    font-size: 12pt;
  }

  .hero {
    min-height: auto;
    padding: 2rem 0;
  }

  .section {
    padding: 1.5rem 0;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}

/* ============================================================
   END OF STYLESHEET
   Shandong Lujun Automobile Manufacturing Co., Ltd. (山东鲁骏汽车制造有限公司)
   ============================================================ */