/* ===== 中天云氧 ZTCLOUDOXY - Global Stylesheet ===== */
/* Color palette matched to oxynova.com */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

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

:root {
  /* Primary Colors - from oxynova.com */
  --primary: #1e73be;
  --primary-dark: #155a96;
  --primary-light: #e8f1fa;
  --accent: #d1bdaf;
  --accent-dark: #b9a393;
  --accent-light: #ece4de;

  /* Neutrals */
  --black: #000000;
  --dark: #232220;
  --dark-warm: #37322b;
  --charcoal: #4a463f;
  --gray-700: #555555;
  --gray: #666666;
  --gray-400: #8a8a8a;
  --gray-300: #b0b0b0;
  --gray-200: #d8d8d8;
  --gray-100: #eeeeee;
  --gray-50: #f5f5f5;
  --white: #ffffff;
  --off-white: #f9f9f9;

  /* Typography */
  --font: 'Noto Sans SC', 'ABeeZee', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 15px;
  --font-size-md: 17px;
  --font-size-lg: 20px;
  --font-size-xl: 28px;
  --font-size-2xl: 36px;
  --font-size-3xl: 48px;
  --font-size-hero: clamp(36px, 5vw, 60px);

  /* Spacing */
  --section-padding: 100px;
  --container-max: 1200px;
  --gap: 24px;
  --radius: 8px;
  --radius-lg: 16px;
  --radius-pill: 50px;

  /* Effects */
  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 4px 24px rgba(0,0,0,.1);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.15);
  --transition: .3s ease;
  --transition-slow: .6s ease;
}

html { scroll-behavior: smooth; font-size: 16px; overflow-x: hidden; scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.15) transparent; }
html::-webkit-scrollbar { width: 6px; }
html::-webkit-scrollbar-track { background: transparent; }
html::-webkit-scrollbar-thumb { background: rgba(255,255,255,.2); border-radius: 3px; }
html::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.35); }
body {
  font-family: var(--font);
  color: var(--gray);
  line-height: 1.8;
  background: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { color: var(--dark); line-height: 1.3; font-weight: 700; }

/* ===== Layout ===== */
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--gap); }
.container-narrow { max-width: 800px; margin: 0 auto; padding: 0 var(--gap); }
.section { padding: var(--section-padding) 0; overflow-x: hidden; }
.section-dark { background: var(--dark); color: rgba(255,255,255,.75); }
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 { color: var(--white); }
.section-charcoal { background: var(--charcoal); color: rgba(255,255,255,.7); }
.section-charcoal h1, .section-charcoal h2, .section-charcoal h3 { color: var(--white); }
.section-light { background: var(--gray-50); }
.section-accent { background: var(--accent-light); }
.text-center { text-align: center; }
.text-upper { text-transform: uppercase; letter-spacing: 3px; }

/* ===== Section Headers ===== */
.section-label {
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--accent-dark);
  margin-bottom: 16px;
}
.section-dark .section-label { color: var(--accent); }
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}
.section-desc {
  font-size: var(--font-size-md);
  color: var(--gray);
  max-width: 640px;
  line-height: 1.9;
}
.section-dark .section-desc { color: rgba(255,255,255,.6); }
.section-header { margin-bottom: 64px; }
.section-header.centered { text-align: center; }
.section-header.centered .section-desc { margin: 0 auto; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 36px;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.btn-accent {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}
.btn-accent:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(209,189,175,.4);
}
.btn-primary {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(30,115,190,.35);
}
.btn-outline-dark {
  background: transparent;
  color: var(--dark);
  border-color: var(--dark);
}
.btn-outline-dark:hover {
  background: var(--dark);
  color: var(--white);
}
.btn-outline-light {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.4);
}
.btn-outline-light:hover {
  background: var(--white);
  color: var(--dark);
}
.btn-white {
  background: var(--white);
  color: var(--dark);
  border-color: var(--white);
}
.btn-white:hover {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
}
.btn-lg { padding: 18px 48px; font-size: var(--font-size-base); }
.btn-sm { padding: 10px 24px; font-size: var(--font-size-xs); }

/* ===== Header / Navigation ===== */
.header {
  position: fixed;
  top: 0; left: 0; width: 100%;
  z-index: 1000;
  background: rgba(0,0,0,.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: var(--transition);
}
.header.scrolled { background: rgba(0,0,0,.98); }
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo img, .logo svg {
  height: 48px;
  width: auto;
}
.logo-text {
  color: var(--white);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.2;
}
.logo-text small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 3px;
  color: rgba(255,255,255,.45);
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links a {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,.7);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--white); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--white); }
.nav-links a.active::after { width: 100%; }
.nav-cta {
  padding: 8px 24px !important;
  border: 1px solid rgba(255,255,255,.25) !important;
  border-radius: var(--radius-pill) !important;
  font-size: 12px !important;
  letter-spacing: 2px !important;
}
.nav-cta:hover {
  background: var(--white) !important;
  color: var(--dark) !important;
  border-color: var(--white) !important;
}
.nav-cta::after { display: none !important; }

/* Hamburger - hidden on desktop, shown only at 768px via media query */
.hamburger {
  display: none !important;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.hamburger span {
  width: 22px;
  height: 1.5px;
  background: var(--white);
  transition: var(--transition);
}

/* Dropdown */
.nav-dropdown {
  position: relative;
}
.nav-dropdown .dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: rgba(0,0,0,.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 12px 0;
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  margin-top: 16px;
}
.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-menu a {
  display: block;
  padding: 10px 24px;
  font-size: 13px;
  color: rgba(255,255,255,.6) !important;
  text-transform: none !important;
  letter-spacing: 0.5px !important;
}
.dropdown-menu a::after { display: none !important; }
.dropdown-menu a:hover {
  color: var(--white) !important;
  background: rgba(255,255,255,.05);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--black);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .5;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.4) 0%, rgba(0,0,0,.2) 40%, rgba(0,0,0,.6) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  max-width: 860px;
  padding: 0 var(--gap);
}
.hero h1 {
  font-size: var(--font-size-hero);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.hero p {
  font-size: var(--font-size-md);
  color: rgba(255,255,255,.7);
  line-height: 1.9;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 60px;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: var(--white);
}
.hero-stat .num span { color: var(--accent); }
.hero-stat .label {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,.5);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-top: 4px;
}

/* Hero Slider */
.hero-slider {
  position: relative;
  height: 37.5vw;
  min-height: 360px;
  margin-top: 73px;
  overflow: hidden;
  background: var(--black);
}
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-slide.active { opacity: 1; }
.hero-slide .slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(1);
}
.hero-slide .slide-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  max-width: 800px;
  padding: 0 var(--gap);
}
.hero-slide h1 {
  font-size: var(--font-size-hero);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 3px;
}
.hero-slide p {
  font-size: var(--font-size-md);
  color: rgba(255,255,255,.7);
  margin-bottom: 36px;
}
.slider-dots {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 10;
}
.slider-dots button {
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.4);
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
}
.slider-dots button.active {
  background: var(--white);
  border-color: var(--white);
}
.slider-arrows {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 20px;
  pointer-events: none;
}
.slider-arrows button {
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.25);
  background: rgba(0,0,0,.3);
  color: var(--white);
  font-size: 18px;
  cursor: pointer;
  transition: var(--transition);
  pointer-events: all;
  backdrop-filter: blur(10px);
}
.slider-arrows button:hover {
  background: rgba(255,255,255,.15);
  border-color: rgba(255,255,255,.5);
}

/* ===== Intro / Text Block ===== */
.intro { padding: 100px 0; text-align: center; }
.intro .section-label { margin-bottom: 20px; }
.intro h2 {
  font-size: clamp(26px, 3.5vw, 40px);
  margin-bottom: 28px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
.intro p {
  font-size: var(--font-size-base);
  max-width: 700px;
  margin: 0 auto 36px;
  line-height: 2;
}

/* ===== Feature / Image Blocks ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: 600px;
}
.feature-block.reverse .feature-media { order: 2; }
.feature-block.reverse .feature-text { order: 1; }
.feature-media {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature-media .placeholder-img {
  width: 100%;
  height: 100%;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  color: rgba(255,255,255,.08);
  background: linear-gradient(135deg, var(--dark) 0%, var(--charcoal) 100%);
}
.feature-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 64px;
}
.feature-text h2 {
  font-size: clamp(24px, 3vw, 36px);
  margin-bottom: 20px;
}
.feature-text p {
  font-size: var(--font-size-base);
  line-height: 2;
  margin-bottom: 32px;
}

/* ===== Product Cards ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}
.product-card .card-media {
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--gray-50), var(--gray-100));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  font-size: 80px;
}
.product-card .card-media::before {
  content: '';
  position: absolute;
  width: 160px; height: 160px;
  border-radius: 50%;
  background: rgba(30,115,190,.06);
  top: -30px; right: -30px;
}
.product-card .card-media .tag {
  position: absolute;
  top: 16px; left: 16px;
  background: var(--accent);
  color: var(--white);
  padding: 5px 16px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.product-card .card-body { padding: 28px; }
.product-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: 8px;
}
.product-card .specs {
  font-size: var(--font-size-sm);
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}
.product-card p {
  font-size: 14px;
  color: var(--gray);
  margin-bottom: 20px;
  line-height: 1.8;
}
.product-card .card-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.product-card .card-link:hover { gap: 12px; }

/* ===== Warranty Banner ===== */
.warranty-banner {
  background: var(--accent-light);
  padding: 60px 0;
  text-align: center;
}
.warranty-banner h3 {
  font-size: var(--font-size-xl);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 12px;
}
.warranty-banner p {
  font-size: var(--font-size-base);
  color: var(--gray);
  margin-bottom: 28px;
  font-style: italic;
}

/* ===== Testimonials ===== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.testimonial-card {
  background: var(--white);
  padding: 40px;
  border-radius: var(--radius-lg);
  position: relative;
  transition: var(--transition);
}
.section-dark .testimonial-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
}
.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.section-dark .testimonial-card:hover {
  background: rgba(255,255,255,.07);
  box-shadow: 0 8px 32px rgba(0,0,0,.3);
}
.testimonial-card .quote-icon {
  font-size: 36px;
  color: var(--accent);
  margin-bottom: 16px;
  line-height: 1;
}
.testimonial-card blockquote {
  font-size: 14px;
  line-height: 2;
  margin-bottom: 28px;
  font-style: italic;
}
.section-dark .testimonial-card blockquote { color: rgba(255,255,255,.7); }
.testimonial-card .author {
  display: flex;
  align-items: center;
  gap: 14px;
}
.testimonial-card .avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-dark);
}
.section-dark .testimonial-card .avatar {
  background: rgba(209,189,175,.15);
  color: var(--accent);
}
.testimonial-card .author-info h4 {
  font-size: 14px;
  font-weight: 700;
}
.testimonial-card .author-info p {
  font-size: 12px;
  color: var(--gray-400);
  margin-bottom: 0;
}

/* ===== Contact Form ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.contact-detail {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 28px;
}
.contact-detail .c-icon {
  width: 48px; height: 48px;
  min-width: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}
.section-dark .contact-detail .c-icon {
  background: rgba(255,255,255,.06);
  color: var(--accent);
}
.contact-detail h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}
.contact-detail p { font-size: 14px; }
.section-dark .contact-detail h4 { color: var(--white); }
.section-dark .contact-detail p { color: rgba(255,255,255,.5); }

.contact-form {
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.08);
  padding: 40px;
  border-radius: var(--radius-lg);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  color: rgba(255,255,255,.5);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  font-size: var(--font-size-base);
  font-family: var(--font);
  background: rgba(255,255,255,.04);
  color: var(--white);
  transition: var(--transition);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,.25);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255,255,255,.06);
}
.form-group select option { background: var(--dark); color: var(--white); }
.form-group textarea { resize: vertical; min-height: 120px; }
.contact-form .btn { width: 100%; padding: 16px; }

/* Light form variant */
.contact-form-light {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  padding: 40px;
  border-radius: var(--radius-lg);
}
.contact-form-light .form-group label { color: var(--gray); }
.contact-form-light .form-group input,
.contact-form-light .form-group select,
.contact-form-light .form-group textarea {
  background: var(--white);
  border-color: var(--gray-200);
  color: var(--dark);
}
.contact-form-light .form-group input::placeholder,
.contact-form-light .form-group textarea::placeholder { color: var(--gray-300); }
.contact-form-light .form-group input:focus,
.contact-form-light .form-group select:focus,
.contact-form-light .form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30,115,190,.08);
  background: var(--white);
}
.contact-form-light .form-group select option { background: var(--white); color: var(--dark); }

/* ===== Trusted / Logos ===== */
.trusted-strip {
  padding: 48px 0;
  background: var(--white);
  border-top: 1px solid var(--gray-100);
  border-bottom: 1px solid var(--gray-100);
}
.trusted-strip p {
  text-align: center;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--gray-400);
  margin-bottom: 32px;
}
.trusted-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 56px;
  flex-wrap: wrap;
}
.trusted-logos .trust-item {
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-300);
  text-transform: uppercase;
  letter-spacing: 2px;
  text-align: center;
  line-height: 1.5;
}

/* ===== Specs Table ===== */
.specs-table {
  width: 100%;
  border-collapse: collapse;
}
.specs-table tr { border-bottom: 1px solid rgba(255,255,255,.06); }
.section-light .specs-table tr { border-bottom: 1px solid var(--gray-100); }
.specs-table td {
  padding: 16px 0;
  font-size: 14px;
}
.specs-table td:first-child {
  font-weight: 600;
  color: rgba(255,255,255,.5);
  width: 40%;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 12px;
}
.section-light .specs-table td:first-child { color: var(--gray-400); }
.specs-table td:last-child { color: var(--white); }
.section-light .specs-table td:last-child { color: var(--dark); }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 40px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 12px; top: 0; bottom: 0;
  width: 1px;
  background: rgba(255,255,255,.1);
}
.section-light .timeline::before { background: var(--gray-200); }
.timeline-item { position: relative; margin-bottom: 48px; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px; top: 6px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--dark);
}
.section-light .timeline-item::before { border-color: var(--white); }
.timeline-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}
.timeline-item .year {
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.timeline-item p {
  font-size: 14px;
  line-height: 1.8;
}

/* ===== Page Banner ===== */
.page-banner {
  position: relative;
  height: 20.83vw;
  min-height: 200px;
  margin-top: 73px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--black);
  overflow: hidden;
}
.page-banner .banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(1);
}
.page-banner .banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
}
.page-banner h1 {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--white);
  margin-bottom: 16px;
}
.page-banner p {
  font-size: var(--font-size-md);
  color: rgba(255,255,255,.6);
  max-width: 500px;
  margin: 0 auto;
}

/* ===== Footer ===== */
.footer {
  background: var(--black);
  color: rgba(255,255,255,.45);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .logo-text {
  color: var(--white);
  font-size: 20px;
  margin-bottom: 16px;
}
.footer-brand .logo-text small { color: rgba(255,255,255,.3); }
.footer-brand p {
  font-size: 13px;
  line-height: 1.9;
  margin-bottom: 24px;
  color: rgba(255,255,255,.4);
}
.footer-social {
  display: flex;
  gap: 10px;
}
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: rgba(255,255,255,.4);
}
.footer-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(209,189,175,.08);
}
.footer-col h4 {
  color: var(--white);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul a {
  font-size: 13px;
  color: rgba(255,255,255,.4);
}
.footer-col ul a:hover { color: var(--white); }
.footer-contact-item {
  font-size: 13px;
  margin-bottom: 14px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.footer-contact-item .fc-icon {
  color: var(--accent);
  font-size: 14px;
  margin-top: 2px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}
.footer-bottom-links { display: flex; gap: 24px; }
.footer-bottom-links a { font-size: 12px; }
.footer-bottom-links a:hover { color: rgba(255,255,255,.8); }

/* ===== Scroll Animations ===== */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-left { opacity: 0; transform: translateX(-40px); transition: opacity .7s ease, transform .7s ease; }
.fade-in-left.visible { opacity: 1; transform: translateX(0); }
.fade-in-right { opacity: 0; transform: translateX(40px); transition: opacity .7s ease, transform .7s ease; }
.fade-in-right.visible { opacity: 1; transform: translateX(0); }
.fade-in-scale { opacity: 0; transform: scale(.95); transition: opacity .7s ease, transform .7s ease; }
.fade-in-scale.visible { opacity: 1; transform: scale(1); }

/* ===== Reusable Grid Classes ===== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); }
.grid-2-3 { display: grid; grid-template-columns: 2fr 3fr; }
.grid-3-2 { display: grid; grid-template-columns: 3fr 2fr; }

/* ===== Mobile Navigation Enhancement ===== */
.nav-dropdown .dropdown-toggle { cursor: pointer; }

/* ===== Compare Table Mobile Scroll Wrapper ===== */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-scroll::-webkit-scrollbar { height: 4px; }
.table-scroll::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 4px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-block { grid-template-columns: 1fr; }
  .feature-block.reverse .feature-media { order: 0; }
  .feature-block.reverse .feature-text { order: 0; }
  .feature-text { padding: 48px 32px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  :root { --section-padding: 80px; }

  /* Reusable grid tablet */
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2-3, .grid-3-2 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  /* --- Navigation --- */
  .nav-links {
    display: none;
    position: fixed;
    top: 72px; left: 0;
    width: 100%;
    background: rgba(0,0,0,.98);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    border-top: 1px solid rgba(255,255,255,.06);
    overflow-y: auto;
    max-height: calc(100vh - 72px);
  }
  .nav-links.active { display: flex; align-items: stretch; }
  .hamburger { display: flex !important; }
  /* Hamburger animation */
  .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }
  /* Hide ALL desktop underline animations on mobile */
  .nav-links a::after,
  .nav-links a:hover::after,
  .nav-links a.active::after { display: none !important; width: 0 !important; content: none !important; }
  /* Mobile nav items - left-aligned, larger touch targets */
  .nav-links > a,
  .nav-dropdown > a {
    display: block;
    padding: 14px 0;
    font-size: 15px !important;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,.08);
    letter-spacing: 0.5px !important;
    text-transform: none !important;
    color: rgba(255,255,255,.75) !important;
  }
  .nav-links > a.active { color: var(--white) !important; }
  /* "联系我们" CTA button on mobile - full width */
  .nav-links .nav-cta {
    margin-top: 16px;
    text-align: center;
    border: 1px solid rgba(255,255,255,.3) !important;
    border-radius: 8px !important;
    padding: 14px 0 !important;
    display: block;
    width: 100%;
  }
  /* Mobile dropdown - click to toggle */
  .nav-dropdown .dropdown-menu {
    position: static;
    transform: none;
    background: transparent;
    border: none;
    padding: 0 0 0 16px;
    margin-top: 0;
    min-width: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    transition: max-height .3s ease;
  }
  .nav-dropdown.open .dropdown-menu {
    max-height: 500px;
  }
  .dropdown-menu a {
    padding: 10px 16px !important;
    font-size: 14px !important;
  }
  /* Disable hover-open on mobile */
  .nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  /* --- Shared component overrides --- */
  .product-grid { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-col-nav { display: none; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .trusted-logos { gap: 24px; }
  :root { --section-padding: 60px; }
  .page-banner { height: 20.83vw; min-height: 180px; }
  .page-banner h1 { letter-spacing: 1px; font-size: clamp(24px, 6vw, 36px); }
  .feature-media .placeholder-img { min-height: 280px; }
  .section-header { margin-bottom: 40px; }

  /* --- Reusable grid mobile --- */
  .grid-2, .grid-3, .grid-4, .grid-5,
  .grid-2-3, .grid-3-2 { grid-template-columns: 1fr; }
  /* Center science image on mobile */
  .science-img { max-width: 280px; width: 100%; justify-self: center; }

  /* --- Intro section mobile --- */
  .intro { padding: 60px 0; }
  .intro h2 { font-size: clamp(22px, 5vw, 32px); }

  /* --- Feature text mobile --- */
  .feature-text { padding: 36px 20px; }

  /* --- Buttons mobile --- */
  .btn { padding: 12px 28px; font-size: 12px; }
  .btn-lg { padding: 14px 36px; font-size: 14px; }

  /* --- Hero slider mobile --- */
  .hero-slider { height: 37.5vw; min-height: 280px; }
  .hero-slide h1 { font-size: clamp(24px, 6vw, 40px); letter-spacing: 1px; }
  .hero-slide p { font-size: 14px; margin-bottom: 24px; }
  .slider-arrows { padding: 0 10px; }
  .slider-arrows button { width: 40px; height: 40px; font-size: 16px; }

  /* --- Warranty banner mobile --- */
  .warranty-banner { padding: 40px 0; }
  .warranty-banner h3 { font-size: 22px; letter-spacing: 1px; }

  /* --- Compare table mobile --- */
  .compare-table { font-size: 12px; }
  .compare-table thead th, .compare-table tbody td { padding: 10px 6px; font-size: 11px; }
  .compare-table thead th:first-child { width: 80px; font-size: 10px; }

  /* --- Specs table mobile --- */
  .specs-table td { font-size: 13px; padding: 12px 0; }
  .specs-table td:first-child { width: 45%; font-size: 11px; }

  /* --- Contact form mobile --- */
  .contact-form,
  .contact-form-light { padding: 20px; }
}

/* ===== Small Phone (480px) ===== */
@media (max-width: 480px) {
  :root { --section-padding: 40px; --gap: 16px; }
  .container { padding: 0 16px; }
  .section-title { font-size: clamp(22px, 5.5vw, 32px); }
  .section-desc { font-size: 14px; }
  .section-label { font-size: 10px; letter-spacing: 3px; }

  .hero-slider { height: 37.5vw; min-height: 220px; }
  .hero-slide h1 { font-size: clamp(20px, 6vw, 30px); letter-spacing: 0; }
  .slider-dots { bottom: 20px; }
  .slider-dots button { width: 8px; height: 8px; }

  .page-banner { height: 20.83vw; min-height: 140px; }
  .page-banner h1 { font-size: clamp(20px, 5.5vw, 28px); letter-spacing: 0; }
  .page-banner p { font-size: 13px; }

  .footer { padding: 40px 0 0; }
  .footer-brand p { font-size: 12px; }
  .footer-col h4 { font-size: 11px; margin-bottom: 16px; }
  .footer-col ul a { font-size: 12px; }
  .footer-bottom { font-size: 11px; padding: 16px 0; }

  .btn { padding: 10px 20px; font-size: 11px; }
  .btn-lg { padding: 12px 28px; font-size: 12px; }

  .testimonial-card { padding: 28px 20px; }
  .testimonial-card blockquote { font-size: 13px; }

  .product-card .card-body { padding: 20px; }
  .product-card h3 { font-size: 17px; }

  .feature-text { padding: 28px 16px; }
  .feature-text h2 { font-size: clamp(20px, 5vw, 28px); }

  .warranty-banner h3 { font-size: 18px; }

  /* Nav touch targets */
  .nav-links > a,
  .nav-dropdown > a { padding: 16px 0; font-size: 16px !important; }

  /* Intro stats cards on small phone */
  .grid-2 { gap: 12px !important; }

  /* Bottom banner text */
  .bottom-banner-text { font-size: 18px !important; }
}

/* ===== Utilities ===== */
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 8px !important; }
.mb-2 { margin-bottom: 16px !important; }
.mb-3 { margin-bottom: 24px !important; }
.mb-4 { margin-bottom: 32px !important; }
.mb-5 { margin-bottom: 48px !important; }
.mt-0 { margin-top: 0 !important; }
.mt-3 { margin-top: 24px !important; }
.mt-5 { margin-top: 48px !important; }
.mx-auto { margin-left: auto; margin-right: auto; }
.max-w-700 { max-width: 700px; }
.max-w-800 { max-width: 800px; }

/* Bottom section divider */
.oxynova-divider {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  z-index: 10;
  background-image: url("data:image/svg+xml,%3Csvg preserveAspectRatio='none' width='1280' height='140' viewBox='0 0 1280 140' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1280 140H0C706.92 140 1280 0 1280 0z' fill='%23232220'/%3E%3C/svg%3E");
  background-size: 100% 100px;
  background-position: bottom;
  background-repeat: no-repeat;
}

/* ===== Floating Contact Widget ===== */
.float-widget {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
}
.float-widget .fw-btn {
  width: 50px; height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  box-shadow: 0 4px 16px rgba(0,0,0,.18);
  text-decoration: none;
}
.float-widget .fw-btn:hover {
  transform: scale(1.12);
  box-shadow: 0 6px 24px rgba(0,0,0,.25);
}
.fw-phone { background: var(--primary); color: var(--white); }
.fw-wechat { background: #07c160; color: var(--white); }
.fw-top { background: var(--dark); color: var(--white); opacity: 0; pointer-events: none; }
.fw-top.show { opacity: 1; pointer-events: all; }
.fw-tooltip {
  position: absolute;
  right: 62px;
  background: var(--dark);
  color: var(--white);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}
.fw-tooltip::after {
  content: '';
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%);
  border: 3px solid transparent;
  border-left-color: var(--dark);
}
.fw-btn:hover .fw-tooltip { opacity: 1; }
.fw-qr {
  position: absolute;
  right: 62px;
  bottom: 0;
  background: var(--white);
  padding: 16px;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,.2);
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  transform: translateY(8px);
}
.fw-wechat:hover .fw-qr,
.fw-wechat:focus .fw-qr {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.fw-qr p { font-size: 12px; color: var(--gray); margin-top: 8px; }
.fw-qr .qr-placeholder {
  width: 120px; height: 120px;
  background: var(--gray-100);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--gray-400);
}
@media (max-width: 768px) {
  .float-widget { right: 16px; bottom: 16px; }
  .float-widget .fw-btn { width: 44px; height: 44px; font-size: 18px; }
}

/* ===== Product Comparison Table ===== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.compare-table thead th {
  background: var(--dark);
  color: var(--white);
  padding: 20px 16px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.compare-table thead th:first-child {
  text-align: left;
  width: 180px;
}
.compare-table thead th .th-name {
  display: block;
  font-size: 16px;
  margin-bottom: 4px;
}
.compare-table thead th .th-tag {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.compare-table tbody td {
  padding: 16px;
  font-size: 14px;
  text-align: center;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}
.compare-table tbody td:first-child {
  text-align: left;
  font-weight: 700;
  color: var(--white);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--charcoal);
}
.compare-table tbody tr:hover { background: var(--gray-50); }
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table .check { color: #2e7d32; font-weight: 700; }
.compare-table .highlight-col { background: rgba(30,115,190,.04); }
.compare-table thead .highlight-col { background: var(--primary); }
.compare-table tfoot td {
  padding: 20px 16px;
  text-align: center;
  border-top: 2px solid var(--gray-200);
}
@media (max-width: 768px) {
  .compare-table { font-size: 12px; }
  .compare-table thead th, .compare-table tbody td { padding: 12px 8px; }
  .compare-table thead th:first-child { width: 100px; }
}

/* ===== PICC Trust Strip ===== */
.picc-trust-strip {
  padding: 48px 0;
  background: linear-gradient(135deg, #faf8f6 0%, #f0ece8 100%);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
}
.picc-trust-inner {
  display: flex;
  align-items: center;
  gap: 40px;
  max-width: 800px;
  margin: 0 auto;
}
.picc-badge-wrap {
  flex-shrink: 0;
}
.picc-badge-img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
}
.picc-trust-text {
  flex: 1;
}
.picc-trust-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}
.picc-trust-desc {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.9;
  margin-bottom: 10px;
}
.picc-trust-policy {
  font-size: 12px;
  color: var(--gray-400);
  letter-spacing: 0.5px;
}
@media (max-width: 768px) {
  .picc-trust-inner {
    flex-direction: column;
    text-align: center;
    gap: 24px;
  }
  .picc-badge-img {
    width: 100px;
    height: 100px;
  }
  .picc-trust-title {
    font-size: 16px;
  }
}