/* ============================================
   Welielec 威锂特电 — Global Style System
   Color Scheme C: Sapphire Blue + Gradient Green
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Primary Palette */
  --blue-primary: #00509e;
  --blue-dark: #003a75;
  --blue-light: #e8f0fe;
  --green-accent: #00c9a7;
  --green-dark: #00a88b;
  --green-light: #e6faf5;

  /* Neutrals */
  --white: #ffffff;
  --gray-50: #f8fafb;
  --gray-100: #f0f4f7;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --dark-bg: #0a1628;

  /* Semantic */
  --text-primary: var(--gray-800);
  --text-secondary: var(--gray-500);
  --text-light: var(--white);
  --bg-body: var(--white);
  --bg-section: var(--gray-50);
  --border-color: var(--gray-200);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 50px rgba(0,0,0,0.1);

  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;
  --header-height-mobile: 64px;
  --section-padding: 100px;
  --section-padding-mobile: 60px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

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

  /* Font */
  --font-primary: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
}

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

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

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: var(--font-primary);
  border: none;
  outline: none;
}

input, textarea, select {
  font-family: var(--font-primary);
  font-size: 16px;
  outline: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--gray-900);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.2rem; }

.section-title {
  text-align: center;
  margin-bottom: 16px;
}

.section-title .en {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--green-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.section-title .cn {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-900);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 50px;
  font-size: 1rem;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Section --- */
.section {
  padding: var(--section-padding) 0;
}

.section--gray {
  background: var(--bg-section);
}

.section--dark {
  background: var(--dark-bg);
  color: var(--text-light);
}

.section--dark .section-title .cn,
.section--dark h2,
.section--dark h3 {
  color: var(--white);
}

.section--dark .section-subtitle {
  color: rgba(255,255,255,0.7);
}

/* ============================================ */
/* HEADER / NAVIGATION                          */
/* ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base);
}

.header--scrolled {
  background: rgba(255,255,255,0.98);
  border-bottom-color: var(--border-color);
  box-shadow: var(--shadow-md);
}

.header__top {
  background: var(--dark-bg);
  color: rgba(255,255,255,0.8);
  font-size: 0.8rem;
  padding: 6px 0;
  display: none;
}

@media (min-width: 1024px) {
  .header__top {
    display: block;
  }
}

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

.header__contact-top a {
  color: rgba(255,255,255,0.8);
  margin-right: 20px;
  font-size: 0.8rem;
}

.header__contact-top a:hover {
  color: var(--green-accent);
}

.header__contact-top i {
  margin-right: 4px;
}

.header__lang {
  display: flex;
  gap: 8px;
}

.header__lang button {
  background: transparent;
  color: rgba(255,255,255,0.6);
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.header__lang button.active,
.header__lang button:hover {
  color: var(--white);
  background: rgba(255,255,255,0.15);
}

/* Main Nav */
.header__main {
  padding: 0;
}

.header__main .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height-mobile);
}

@media (min-width: 1024px) {
  .header__main .container {
    height: var(--header-height);
  }
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo__img {
  width: 120px;
  height: 120px;
  overflow: hidden;
  flex-shrink: 0;
  background: transparent;
}

.logo__img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.logo__text {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
}

.logo__text small {
  display: block;
  font-size: 0.92rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

/* Desktop Nav */
.nav {
  display: none;
}

@media (min-width: 1024px) {
  .nav {
    display: flex;
    align-items: center;
    gap: 4px;
  }
}

.nav__link {
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link.active {
  color: var(--blue-primary);
  background: var(--blue-light);
}

.nav__link--cta {
  background: linear-gradient(135deg, var(--blue-primary), var(--green-accent));
  color: var(--white) !important;
  padding: 10px 22px;
  margin-left: 12px;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.nav__link--cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,80,158,0.3);
}

/* Mobile Menu Button */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border-radius: var(--radius-sm);
}

.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-800);
  position: relative;
  transition: all var(--transition-base);
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-800);
  position: absolute;
  transition: all var(--transition-base);
}

.nav-toggle__bar::before { top: -8px; }
.nav-toggle__bar::after { top: 8px; }

.nav-toggle--active .nav-toggle__bar {
  background: transparent;
}

.nav-toggle--active .nav-toggle__bar::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle--active .nav-toggle__bar::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height-mobile));
  background: var(--white);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 24px;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}

.mobile-menu--open {
  transform: translateX(0);
}

.mobile-menu__link {
  display: block;
  padding: 14px 0;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover,
.mobile-menu__link.active {
  color: var(--blue-primary);
}

.mobile-menu__cta {
  display: block;
  margin-top: 16px;
  padding: 14px 24px;
  background: linear-gradient(135deg, var(--blue-primary), var(--green-accent));
  color: var(--white);
  text-align: center;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
}

.mobile-menu .header__lang {
  margin-top: 20px;
  justify-content: center;
}

.mobile-menu .header__lang button {
  color: var(--text-secondary);
  padding: 8px 16px;
  border: 1px solid var(--border-color);
}

.mobile-menu .header__lang button.active,
.mobile-menu .header__lang button:hover {
  color: var(--white);
  background: var(--blue-primary);
  border-color: var(--blue-primary);
}

/* ============================================ */
/* HERO / BANNER CAROUSEL                       */
/* ============================================ */

.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  max-height: 900px;
  overflow: hidden;
  margin-top: var(--header-height-mobile);
}

@media (min-width: 1024px) {
  .hero {
    margin-top: var(--header-height);
  }
}

.hero__slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero__slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease-in-out;
  display: flex;
  align-items: center;
}

.hero__slide--active {
  opacity: 1;
}

.hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0,59,117,0.88), rgba(0,10,30,0.75));
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  color: var(--white);
}

.hero__content .hero__tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0,201,167,0.2);
  border: 1px solid rgba(0,201,167,0.4);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--green-accent);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.hero__content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--white);
}

.hero__content h1 .highlight {
  background: linear-gradient(135deg, var(--green-accent), #00e6bf);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__content p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero__dots {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  gap: 10px;
}

.hero__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.hero__dot--active {
  background: var(--green-accent);
  transform: scale(1.3);
}

.hero__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--white);
  font-size: 1.2rem;
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  backdrop-filter: blur(5px);
}

.hero__arrow:hover {
  background: rgba(255,255,255,0.25);
}

.hero__arrow--prev { left: 24px; }
.hero__arrow--next { right: 24px; }

@media (min-width: 768px) {
  .hero__arrow { display: flex; }
}

/* ============================================ */
/* BUTTONS                                      */
/* ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--blue-primary), var(--blue-dark));
  color: var(--white);
  box-shadow: 0 4px 14px rgba(0,80,158,0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,80,158,0.4);
  color: var(--white);
}

.btn--accent {
  background: linear-gradient(135deg, var(--green-accent), var(--green-dark));
  color: var(--white);
  box-shadow: 0 4px 14px rgba(0,201,167,0.3);
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,201,167,0.4);
  color: var(--white);
}

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

.btn--outline:hover {
  background: var(--white);
  color: var(--blue-primary);
}

/* Colorful back button — eye-catching green gradient */
.btn--back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--green-accent), #008060);
  color: #fff;
  box-shadow: 0 4px 18px rgba(0, 201, 167, 0.4);
  transition: all 0.25s ease;
}
.btn--back:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 201, 167, 0.55);
  color: #fff;
}

/* Back button layout bar */
.back-bar {
  text-align: center;
  padding: 40px 0 0;
}

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

.btn--outline-blue:hover {
  background: var(--blue-primary);
  color: var(--white);
}

.btn--white {
  background: var(--white);
  color: var(--blue-primary);
  box-shadow: var(--shadow-md);
}

.btn--white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--blue-primary);
}

.btn--lg {
  padding: 16px 36px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn--sm {
  padding: 8px 20px;
  font-size: 0.85rem;
}

/* ============================================ */
/* SECTION HEADERS                              */
/* ============================================ */

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header__tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--green-light);
  color: var(--green-dark);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header h2 .accent {
  color: var(--blue-primary);
}

.section-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section--dark .section-header p {
  color: rgba(255,255,255,0.7);
}

.section--dark .section-header h2 {
  color: var(--white);
}

/* ============================================ */
/* PRODUCT CATEGORY CARDS                       */
/* ============================================ */
/* PRODUCTS LAYOUT — Sidebar + Content           */
/* ============================================ */

.products-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

/* === Left Sidebar === */
.products-sidebar {
  flex: 0 0 210px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  padding: 24px 0;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.products-sidebar__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 0 24px 16px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 8px;
}

.products-sidebar__nav {
  list-style: none;
}

.products-sidebar__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 24px;
  font-size: 1.08rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 4px solid transparent;
  cursor: pointer;
}

.products-sidebar__link:hover {
  background: var(--blue-light);
  color: var(--blue-primary);
}

.products-sidebar__link--active {
  background: var(--blue-light);
  color: var(--blue-primary);
  border-left-color: var(--blue-primary);
  font-weight: 700;
}

.products-sidebar__count {
  margin-left: auto;
  font-size: 0.9rem;
  color: var(--gray-400);
  background: var(--gray-100);
  padding: 3px 11px;
  border-radius: 50px;
  min-width: 28px;
  text-align: center;
}

.products-sidebar__link--active .products-sidebar__count {
  background: var(--blue-primary);
  color: var(--white);
}

/* === Right Content === */
.products-content {
  flex: 1;
  min-width: 0;
}

/* ============================================ */

.product-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 20px;
}

@media (min-width: 576px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  border: 1px solid var(--border-color);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--green-accent);
}

.product-card__img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--gray-100);
  position: relative;
  overflow: hidden;
}

.product-card__img .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-light), var(--green-light));
  color: var(--blue-primary);
  font-size: 3rem;
}

.product-card__body {
  padding: 24px;
}

.product-card__icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--blue-primary), var(--green-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.product-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.product-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 16px;
  line-height: 1.6;
}

.product-card__link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--blue-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.product-card__link:hover {
  color: var(--green-accent);
}

.product-card__badge {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  background: var(--green-accent);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 50px;
}

/* Products sidebar responsive */
@media (max-width: 768px) {
  .products-layout {
    flex-direction: column;
    gap: 20px;
  }

  .products-sidebar {
    flex: 0 0 auto;
    width: 100%;
    position: static;
    padding: 16px 0;
  }

  .products-sidebar__nav {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 0 16px;
  }

  .products-sidebar__link {
    padding: 10px 16px;
    font-size: 0.92rem;
    border-left: none;
    border-radius: var(--radius-sm);
  }

  .products-sidebar__link--active {
    border-left: none;
    background: var(--blue-primary);
    color: var(--white);
  }

  .products-sidebar__title {
    display: none;
  }

  .products-sidebar__count {
    display: none;
  }
}

/* ============================================ */
/* SOLUTION CARDS                               */
/* ============================================ */

.solution-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* === Solution Card === */
.solution-card {
  display: flex;
  flex-direction: row;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--text-primary);
  align-items: stretch;
}

.solution-card:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--green-accent);
}

.solution-card__img {
  flex: 0 0 280px;
  min-height: 200px;
  overflow: hidden;
  background: var(--gray-100);
}

.solution-card__img .placeholder {
  width: 100%;
  height: 100%;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-light), var(--green-light));
  color: var(--blue-primary);
  font-size: 3rem;
}

.solution-card__body {
  flex: 1;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.solution-card__body h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.solution-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 12px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.solution-card__feats {
  list-style: none;
  padding: 0;
  margin-bottom: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

.solution-card__feats li {
  font-size: 0.85rem;
  color: var(--gray-500);
  padding: 3px 0;
  padding-left: 16px;
  position: relative;
}

.solution-card__feats li::before {
  content: '•';
  color: var(--green-accent);
  position: absolute;
  left: 0;
  font-weight: bold;
}

.solution-card__link {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--blue-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.solution-card:hover .solution-card__link {
  color: var(--green-accent);
}

/* === Solution Content (detail page) === */
.solution-content {
  max-width: 900px;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-primary);
}

.solution-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 20px 0;
}

.solution-content h2 {
  font-size: 1.4rem;
  color: var(--gray-900);
  margin-top: 36px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--green-accent);
}

.solution-content h3 {
  font-size: 1.15rem;
  color: var(--blue-primary);
  margin-top: 28px;
  margin-bottom: 10px;
}

.solution-content p {
  margin-bottom: 14px;
  color: var(--gray-700);
}

.solution-content br + br {
  display: none;
}

@media (max-width: 768px) {
  .solution-card {
    flex-direction: column;
  }
  .solution-card__img {
    flex: 0 0 auto;
  }
}

.solution-card__icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: var(--blue-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--blue-primary);
  transition: all var(--transition-base);
}

.solution-card:hover .solution-card__icon {
  background: linear-gradient(135deg, var(--blue-primary), var(--green-accent));
  color: var(--white);
}

.solution-card h3 {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.solution-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ============================================ */
/* COUNTERS / STATS                             */
/* ============================================ */

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  text-align: center;
}

@media (min-width: 768px) {
  .stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-item__number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue-primary), var(--green-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-item__label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.section--dark .stat-item__label {
  color: rgba(255,255,255,0.7);
}

.section--dark .stat-item__number {
  background: linear-gradient(135deg, #4db8ff, var(--green-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================ */
/* CERTIFICATIONS                               */
/* ============================================ */

.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

@media (min-width: 576px) {
  .cert-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 992px) {
  .cert-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

.cert-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.cert-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.cert-card__img {
  width: 100%;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-50);
  overflow: hidden;
}

.cert-card__img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 16px;
}

.cert-card__img .placeholder-icon {
  font-size: 3rem;
  font-weight: 800;
  color: var(--green-dark);
  background: var(--green-light);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cert-card__body {
  padding: 16px 20px 20px;
}

.cert-card__body h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
  color: var(--gray-800);
}

.cert-card__body p {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* Cert card — click indicator for cards with images */
.cert-card[data-image] {
  cursor: pointer;
}
.cert-card[data-image]:hover .cert-card__img img {
  transform: scale(1.05);
  transition: transform 0.3s ease;
}

/* Cert lightbox */
.cert-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.cert-lightbox--open {
  opacity: 1;
}
.cert-lightbox--closing {
  opacity: 0;
}
.cert-lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
}
.cert-lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.cert-lightbox__content img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}
.cert-lightbox__close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
  transition: opacity 0.2s;
}
.cert-lightbox__close:hover {
  opacity: 0.7;
}
.cert-lightbox__caption {
  color: #fff;
  margin-top: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
}

/* --- Generic image lightbox (product detail, etc.) --- */
.img-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.img-lightbox--open {
  opacity: 1;
}
.img-lightbox--closing {
  opacity: 0;
}
.img-lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
}
.img-lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.img-lightbox__content img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}
.img-lightbox__close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
  padding: 4px 8px;
  transition: opacity 0.2s;
}
.img-lightbox__close:hover {
  opacity: 0.7;
}
.img-lightbox__caption {
  color: #fff;
  margin-top: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
}

/* Product gallery zoom hint hover effect */
.product-gallery__img-wrapper:hover .product-gallery__zoom-hint {
  opacity: 0.8;
}
.product-gallery__img-wrapper .product-gallery__zoom-hint {
  opacity: 0.5;
}

/* ============================================ */
/* CASE LIST — single column, full-width rows              */
/* ============================================ */

.case-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.case-item {
  display: flex;
  align-items: stretch;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.case-item:hover {
  background: var(--gray-50);
  box-shadow: inset 4px 0 0 var(--green-accent), 0 4px 16px rgba(0,0,0,0.08);
}

.case-item__img {
  flex: 0 0 280px;
  min-height: 200px;
  background: var(--gray-100);
}
.case-item__img .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--gray-100), var(--gray-200));
  color: var(--gray-400);
}
.case-item__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-item__body {
  flex: 1;
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.case-item__tag {
  font-size: 0.75rem;
  color: var(--green-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.case-item__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 10px 0;
  color: var(--text-primary);
  line-height: 1.3;
}
.case-item__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0 0 12px 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.case-item__link {
  color: var(--blue-primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: color 0.2s;
}
.case-item:hover .case-item__link {
  color: var(--green-accent);
}

@media (max-width: 768px) {
  .case-item {
    flex-direction: column;
  }
  .case-item__img {
    flex: 0 0 auto;
    height: 200px;
  }
  .case-item__body {
    padding: 20px;
  }
}

/* CASE DETAIL PAGE                                   */
/* ============================================ */

.case-media-gallery {
  margin-bottom: 40px;
}
.case-media-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--gray-100);
  margin-bottom: 16px;
}
.case-media-item img,
.case-media-item video {
  width: 100%;
  min-height: 360px;
  max-height: 600px;
  object-fit: contain;
  background: #000;
  display: block;
}
.case-media-item--video {
  width: 100%;
  max-width: 100%;
}
.case-media-item--video video {
  min-height: 400px;
}
.case-video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
}
.case-video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.case-detail-content {
  max-width: 860px;
  margin: 0 auto;
}
.case-detail-header {
  text-align: center;
  margin-bottom: 36px;
}
.case-detail-tag {
  font-size: 0.8rem;
  color: var(--green-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}
.case-detail-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 12px 0;
  line-height: 1.3;
}
.case-detail-summary {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}
.case-detail-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}
.case-detail-body p {
  margin-bottom: 16px;
}
.case-detail-body img {
  max-width: 100%;
  border-radius: var(--radius);
  margin: 16px 0;
}
.case-detail-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 860px;
  margin: 48px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

/* ============================================ */
/* NEWS DETAIL                                  */
/* ============================================ */

.news-media-gallery {
  max-width: 860px;
  margin: 0 auto 32px;
}
.news-media-gallery img {
  width: 100%;
  border-radius: var(--radius-lg);
  max-height: 480px;
  object-fit: cover;
}

.news-detail-content {
  max-width: 860px;
  margin: 0 auto;
}
.news-detail-header {
  text-align: center;
  margin-bottom: 36px;
}
.news-detail-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}
.news-detail-tag {
  font-size: 0.8rem;
  color: var(--green-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  background: var(--green-light);
  padding: 4px 14px;
  border-radius: 50px;
}
.news-detail-date {
  font-size: 0.9rem;
  color: var(--gray-500);
}
.news-detail-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 12px 0;
  line-height: 1.3;
}
.news-detail-summary {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}
.news-detail-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}
.news-detail-body p {
  margin-bottom: 16px;
}
.news-detail-body img {
  max-width: 100%;
  border-radius: var(--radius);
  margin: 16px 0;
}
.news-detail-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 860px;
  margin: 48px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
  .news-detail-header h2 {
    font-size: 1.5rem;
  }
  .news-detail-footer {
    flex-direction: column;
    gap: 16px;
  }
}

/* ============================================ */
/* NEWS CARDS                                    */
/* ============================================ */
.news-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.news-card {
  display: flex;
  flex-direction: row;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--border-color);
  align-items: stretch;
}

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

.news-card__img {
  flex: 0 0 280px;
  min-height: 180px;
  background: var(--gray-100);
}

.news-card__img .placeholder {
  width: 100%;
  height: 100%;
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-light), var(--gray-100));
  color: var(--blue-primary);
  font-size: 2rem;
}

.news-card__body {
  flex: 1;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-card__date {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.news-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
  line-height: 1.4;
}

@media (max-width: 768px) {
  .news-card {
    flex-direction: column;
  }
  .news-card__img {
    flex: 0 0 auto;
  }
}

.news-card p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ============================================ */
/* CTA SECTION                                  */
/* ============================================ */

.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--blue-primary), #003a6e);
  text-align: center;
  color: var(--white);
}

.cta-section h2 {
  color: var(--white);
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  margin-bottom: 16px;
}

.cta-section p {
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
}

.cta-section .btn {
  margin: 0 8px;
}

/* ============================================ */
/* FOOTER                                       */
/* ============================================ */

.footer {
  background: var(--dark-bg);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 40px;
  padding-bottom: 40px;
}

@media (min-width: 576px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .footer__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.footer h4 {
  color: var(--white);
  font-size: 1.05rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--green-accent);
}

.footer__about p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer__social {
  display: flex;
  gap: 12px;
}

.footer__social a {
  width: 38px;
  height: 38px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition-fast);
  font-size: 0.9rem;
}

.footer__social a:hover {
  background: var(--green-accent);
  color: var(--white);
}

.social-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.social-links a {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  background: var(--blue-primary);
  transition: all var(--transition-fast);
}

.social-links a:hover {
  background: var(--green-accent);
  transform: translateY(-2px);
}

.footer__links a {
  display: block;
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  padding: 6px 0;
  transition: all var(--transition-fast);
}

.footer__links a:hover {
  color: var(--green-accent);
  padding-left: 6px;
}

.footer__contact p {
  font-size: 0.88rem;
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.footer__contact .icon {
  color: var(--green-accent);
  flex-shrink: 0;
}

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer__bottom a[data-i18n="footer.icp"]:hover {
  color: #fff;
}

/* ============================================ */
/* PAGE BANNER (SUB PAGES)                      */
/* ============================================ */

.page-banner {
  position: relative;
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
  text-align: center;
  color: var(--white);
  margin-top: var(--header-height-mobile);
  overflow: hidden;
}

@media (min-width: 1024px) {
  .page-banner {
    margin-top: var(--header-height);
    padding: 140px 0 80px;
  }
}

.page-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,201,167,0.15), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.page-banner::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,80,158,0.2), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.page-banner h1 {
  color: var(--white);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  position: relative;
  z-index: 1;
  margin-bottom: 12px;
}

.page-banner .breadcrumb {
  position: relative;
  z-index: 1;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

.page-banner .breadcrumb a {
  color: rgba(255,255,255,0.85);
}

.page-banner .breadcrumb span {
  margin: 0 8px;
  color: rgba(255,255,255,0.5);
}

/* ============================================ */
/* ABOUT PAGE                                   */
/* ============================================ */

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

@media (min-width: 768px) {
  .about-intro {
    grid-template-columns: 1fr 1fr;
  }
}

.about-intro__img {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--gray-200);
  aspect-ratio: 4 / 3;
}

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

.about-intro__img .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-light), var(--green-light));
  color: var(--blue-primary);
  font-size: 4rem;
}

.about-intro__text h2 {
  margin-bottom: 20px;
}

.about-intro__text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}

/* ============================================
   ABOUT PAGE — PROMO VIDEO
   ============================================ */
.about-video {
  max-width: 900px;
  margin: 0 auto;
}
.about-video__wrapper {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: #000;
}
.about-video__player {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #000;
}

/* Timeline */
.timeline {
  position: relative;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

@media (min-width: 768px) {
  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }
}

.timeline__item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .timeline__item {
    width: 50%;
    padding-left: 0;
  }
  .timeline__item:nth-child(odd) {
    padding-right: 48px;
    text-align: right;
  }
  .timeline__item:nth-child(even) {
    margin-left: 50%;
    padding-left: 48px;
  }
}

.timeline__dot {
  position: absolute;
  left: 10px;
  top: 4px;
  width: 22px;
  height: 22px;
  background: var(--green-accent);
  border-radius: 50%;
  border: 4px solid var(--white);
  box-shadow: 0 0 0 4px var(--green-light);
}

@media (min-width: 768px) {
  .timeline__dot {
    left: 50%;
    transform: translateX(-50%);
  }
  .timeline__item:nth-child(odd) .timeline__dot {
    left: auto;
    right: -11px;
    transform: none;
  }
  .timeline__item:nth-child(even) .timeline__dot {
    left: -11px;
    transform: none;
  }
}

.timeline__year {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--blue-primary);
  margin-bottom: 4px;
}

.timeline__text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Mountain Timeline — 山脉背景发展里程碑 */
.mountain-timeline {
  position: relative;
  width: 100%;
  max-width: 1200px;
  height: 0;
  padding-bottom: 52%; /* 1200:624 ≈ 52% — wide aspect for mountain panorama */
  margin: 0 auto;
  background-image: url('../images/mountain-timeline-bg.png');
  background-size: cover;
  background-position: center bottom;
  background-repeat: no-repeat;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.mountain-timeline__svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Filled area under the zigzag line */
.mountain-timeline__area {
  opacity: 0;
  transition: opacity 1s ease 0.5s;
}
.mountain-timeline__path--visible ~ .mountain-timeline__area,
.mountain-timeline__area {
  opacity: 1;
}

/* Timeline zigzag path (stock-chart style) */
.mountain-timeline__path {
  fill: none;
  stroke: url(#pathGradient);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: url(#dropShadow);
  opacity: 0;
  transition: opacity 1.2s ease 0.2s;
}
.mountain-timeline__path--visible {
  opacity: 1;
}

/* Vertical tick line (dot → year label) */
.mountain-timeline__tick {
  stroke: rgba(0, 80, 158, 0.18);
  stroke-width: 1;
  stroke-dasharray: 2 4;
}

/* Milestone dot */
.mountain-timeline__dot {
  cursor: pointer;
  transition: all 0.25s ease;
}
.mountain-timeline__dot--has-data {
  fill: #00c9a7;
  stroke: #fff;
  stroke-width: 3;
  r: 9;
  filter: url(#dotGlow);
}
.mountain-timeline__dot--has-data:hover,
.mountain-timeline__dot--hover.mountain-timeline__dot--has-data {
  r: 14;
  fill: #00509e;
  stroke: #00c9a7;
  stroke-width: 3;
}
.mountain-timeline__dot--empty {
  fill: #cbd5e1;
  stroke: #94a3b8;
  stroke-width: 2;
  r: 5;
  filter: none;
}
.mountain-timeline__dot--empty:hover,
.mountain-timeline__dot--hover.mountain-timeline__dot--empty {
  r: 9;
  fill: #94a3b8;
  stroke: #64748b;
  stroke-width: 2;
}

/* Pulsing ring for latest year */
.mountain-timeline__pulse {
  fill: none;
  stroke: #00c9a7;
  stroke-width: 2;
  opacity: 0.6;
  animation: mountainPulse 2s ease-out infinite;
}
.mountain-timeline__pulse--arrow {
  stroke: #f59e0b;
  animation: mountainPulseArrow 1.8s ease-out infinite;
}
@keyframes mountainPulse {
  0% { r: 9; opacity: 0.7; }
  100% { r: 24; opacity: 0; }
}
@keyframes mountainPulseArrow {
  0% { r: 6; opacity: 0.8; }
  100% { r: 20; opacity: 0; }
}

/* Arrow line extending beyond last year toward the future */
.mountain-timeline__arrow-line {
  fill: none;
  stroke: #00c9a7;
  stroke-width: 2.5;
  stroke-dasharray: 8 5;
  stroke-linecap: round;
}

/* Arrow dot at the tip (future point) */
.mountain-timeline__arrow-dot {
  fill: #f59e0b;
  stroke: #fff;
  stroke-width: 2;
  filter: url(#dotGlow);
}

/* Future label next to the arrow */
.mountain-timeline__future {
  font-size: 13px;
  font-weight: 700;
  fill: #f59e0b;
  pointer-events: none;
  text-anchor: start;
}

/* Year label */
.mountain-timeline__year {
  font-size: 15px;
  font-weight: 700;
  text-anchor: middle;
  pointer-events: none;
}
.mountain-timeline__year--active {
  fill: #00509e;
}
.mountain-timeline__year--muted {
  fill: #94a3b8;
  font-size: 12px;
}

/* Floating tooltip (fixed-position on body, avoids SVG overflow clipping) */
.mountain-timeline__tooltip {
  position: fixed;
  background: rgba(10, 22, 40, 0.94);
  color: #fff;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.85rem;
  line-height: 1.7;
  max-width: 320px;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, calc(-100% - 14px));
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 0 6px 24px rgba(0,0,0,0.35);
  backdrop-filter: blur(8px);
  z-index: 999;
  text-align: center;
  white-space: normal;
  word-break: break-word;
}
.mountain-timeline__tooltip--visible {
  opacity: 1;
  transform: translate(-50%, calc(-100% - 20px));
}
.mountain-timeline__tooltip::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 7px solid rgba(10, 22, 40, 0.94);
}
.mountain-timeline__tooltip--empty {
  background: rgba(30, 41, 59, 0.9);
}
.mountain-timeline__tooltip--empty::after {
  border-top-color: rgba(30, 41, 59, 0.9);
}
.mountain-timeline__tooltip .tt-year {
  display: block;
  color: #00c9a7;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 3px;
}

/* Section header sub */
.section-header__sub {
  color: var(--gray-500);
  font-size: 0.95rem;
  margin-top: 4px;
}

/* Responsive */
@media (max-width: 768px) {
  .mountain-timeline {
    padding-bottom: 65%; /* taller on mobile */
    border-radius: var(--radius-md);
  }
  .mountain-timeline__dot--has-data {
    r: 7;
  }
  .mountain-timeline__dot--has-data:hover,
  .mountain-timeline__dot--hover.mountain-timeline__dot--has-data {
    r: 11;
  }
  .mountain-timeline__year {
    font-size: 11px;
  }
  .mountain-timeline__year--muted {
    font-size: 9px;
  }
  .mountain-timeline__tooltip {
    max-width: 180px;
    font-size: 0.75rem;
    padding: 8px 12px;
  }
}

/* Values */
.values-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 24px;
}

@media (min-width: 576px) {
  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .values-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.value-card {
  text-align: center;
  padding: 36px 20px;
}

.value-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--green-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--green-dark);
}

.value-card h3 {
  margin-bottom: 8px;
}

.value-card p {
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ============================================ */
/* PRODUCTS PAGE                                */
/* ============================================ */

.product-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.product-filter__btn {
  padding: 10px 24px;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.product-filter__btn:hover,
.product-filter__btn--active {
  background: var(--blue-primary);
  color: var(--white);
  border-color: var(--blue-primary);
}

/* ============================================ */
/* PRODUCT DETAIL                               */
/* ============================================ */

.product-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

@media (min-width: 768px) {
  .product-detail {
    grid-template-columns: 1fr 1fr;
  }
}

.product-gallery {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.product-gallery__main {
  width: 100%;
  height: 400px;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 16px;
}

.product-gallery__main .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-light), var(--green-light));
  color: var(--blue-primary);
  font-size: 5rem;
}

.product-gallery__thumbs {
  display: flex;
  gap: 12px;
}

.product-gallery__thumb {
  width: 80px;
  height: 80px;
  background: var(--gray-100);
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color var(--transition-fast);
}

.product-gallery__thumb:hover,
.product-gallery__thumb--active {
  border-color: var(--blue-primary);
}

.product-info h2 {
  margin-bottom: 12px;
}

.product-info__model {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.product-info__desc {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.product-specs {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
}

.product-specs tr {
  border-bottom: 1px solid var(--border-color);
}

.product-specs td {
  padding: 12px 8px;
  font-size: 0.9rem;
}

.product-specs td:first-child {
  font-weight: 600;
  color: var(--text-primary);
  width: 40%;
}

.product-specs td:last-child {
  color: var(--text-secondary);
}

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

/* Features list */
.feature-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}

@media (min-width: 576px) {
  .feature-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.feature-list li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--green-light);
  color: var(--green-dark);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* ============================================ */
/* CONTACT PAGE                                 */
/* ============================================ */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

.contact-info__item {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.contact-info__icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--blue-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-primary);
  font-size: 1.2rem;
}

.contact-info__text h4 {
  margin-bottom: 4px;
  font-size: 1rem;
}

.contact-info__text p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.contact-form {
  background: var(--white);
  padding: 36px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
  background: var(--gray-50);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--blue-primary);
  box-shadow: 0 0 0 3px rgba(0,80,158,0.1);
  background: var(--white);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

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

@media (min-width: 576px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================ */
/* SOLUTIONS PAGE                               */
/* ============================================ */

.solution-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

@media (min-width: 768px) {
  .solution-detail {
    grid-template-columns: 1fr 1fr;
  }
}

.solution-detail:nth-child(even) .solution-detail__img {
  order: -1;
}

@media (min-width: 768px) {
  .solution-detail:nth-child(even) .solution-detail__img {
    order: 0;
  }
  .solution-detail:nth-child(even) .solution-detail__text {
    order: -1;
  }
}

.solution-detail__img {
  width: 100%;
  height: 320px;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.solution-detail__img .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue-light), var(--green-light));
  color: var(--blue-primary);
  font-size: 4rem;
}

.solution-detail__text h3 {
  margin-bottom: 16px;
}

.solution-detail__text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}

/* ============================================ */
/* PAGINATION                                   */
/* ============================================ */

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.pagination a,
.pagination span {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  background: var(--white);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.pagination a:hover,
.pagination .current {
  background: var(--blue-primary);
  color: var(--white);
  border-color: var(--blue-primary);
}

/* ============================================ */
/* SCROLL ANIMATIONS                            */
/* ============================================ */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }

/* ============================================ */
/* BACK TO TOP                                  */
/* ============================================ */

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--blue-primary), var(--green-accent));
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: 0 4px 16px rgba(0,80,158,0.3);
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,80,158,0.4);
}

/* ============================================ */
/* UTILITY                                      */
/* ============================================ */

.text-center { text-align: center; }
.text-accent { color: var(--green-accent); }
.text-primary { color: var(--blue-primary); }

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

/* ============================================ */
/* RESPONSIVE                                   */
/* ============================================ */

@media (max-width: 767px) {
  .section {
    padding: var(--section-padding-mobile) 0;
  }

  .hero {
    height: 80vh;
    min-height: 500px;
  }

  .hero__content {
    text-align: center;
  }

  .hero__buttons {
    justify-content: center;
  }

  .product-detail {
    gap: 32px;
  }

  .product-gallery {
    position: static;
  }

  .product-gallery__main {
    height: 280px;
  }

  .footer__grid {
    text-align: center;
  }

  .footer h4::after {
    left: 50%;
    transform: translateX(-50%);
  }

  .footer__social {
    justify-content: center;
  }

  .footer__contact p {
    justify-content: center;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}

@media (max-width: 575px) {
  .hero__content h1 {
    font-size: 1.6rem;
  }

  .hero__content p {
    font-size: 0.95rem;
  }

  .btn--lg {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
}