/* ============================================================
   ZEYE TECH — styles.css
   Mobile-first responsive stylesheet
   Color system: Deep Teal #0c5b5f (primary), Amber #d89c32 (accent)
   ============================================================ */

/* ===== CSS VARIABLES ===== */
:root {
  --color-primary: #0c5b5f;
  --color-primary-dark: #084446;
  --color-primary-light: #1a7a7f;
  --color-accent: #d89c32;
  --color-accent-dark: #b8821a;
  --color-accent-light: #f0b84a;
  --color-text: #1a1a2e;
  --color-text-muted: #5a6272;
  --color-text-light: #8892a4;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7f8;
  --color-bg-dark: #0a1628;
  --color-border: #e2e8ed;
  --color-white: #ffffff;
  --color-black: #000000;

  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.14), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.18);

  --transition: 0.25s ease;
  --transition-slow: 0.4s ease;

  --container-max: 1200px;
  --container-pad: 1rem;
  --section-pad: 4rem 0;
  --nav-height: 68px;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }

/* ===== ACCESSIBILITY ===== */
.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;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ===== CONTAINER ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ===== TYPOGRAPHY ===== */
.section-eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.text-center { text-align: center; }
.section-desc.text-center { margin-left: auto; margin-right: auto; }

/* ===== SECTION ===== */
.section { padding: var(--section-pad); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  text-align: center;
}

.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }

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

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.7);
}
.btn-outline:hover { background: rgba(255,255,255,0.15); border-color: var(--color-white); }

.btn-sm { padding: 0.5rem 1.25rem; font-size: 0.875rem; }
.btn-full { width: 100%; justify-content: center; }

/* ===== HEADER / NAV ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(12, 91, 95, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1rem;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  color: var(--color-white);
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}
.logo-zh { font-size: 1.2rem; font-weight: 800; letter-spacing: 0.05em; }
.logo-en { font-size: 0.65rem; font-weight: 600; letter-spacing: 0.2em; opacity: 0.85; }

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.hamburger {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .hamburger:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .hamburger:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  background: var(--color-primary-dark);
  padding: 1rem 0 2rem;
  flex-direction: column;
  gap: 0;
  max-height: calc(100vh - var(--nav-height));
  overflow-y: auto;
}
.nav-menu.open { display: flex; }

.nav-link {
  display: block;
  padding: 0.85rem 1.5rem;
  color: rgba(255,255,255,0.9);
  font-weight: 600;
  font-size: 1rem;
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--color-accent); background: rgba(255,255,255,0.05); }
.nav-cta { color: var(--color-accent) !important; }

.nav-lang {
  padding: 0.6rem 1.5rem;
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 0.18rem;
  border: 1px solid rgba(255,255,255,0.22);
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  white-space: nowrap;
}

.lang-btn {
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: rgba(255,255,255,0.78);
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1;
  min-width: 1.8rem;
  padding: 0.4rem 0.48rem;
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}

.lang-btn.active,
.lang-btn[aria-pressed="true"] {
  color: var(--color-primary-dark);
  background: var(--color-white);
}

.nav-dropdown { position: relative; }
.dropdown-menu {
  display: none;
  background: rgba(0,0,0,0.2);
  padding: 0.25rem 0;
}
.nav-dropdown.open .dropdown-menu { display: block; }
.dropdown-menu a {
  display: block;
  padding: 0.6rem 2.5rem;
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.dropdown-menu a:hover { color: var(--color-accent); }

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8,68,70,0.88) 0%, rgba(12,91,95,0.72) 50%, rgba(10,22,40,0.80) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-white);
  padding: 2rem 1rem;
  max-width: 900px;
  width: 100%;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 1rem;
  opacity: 0.9;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2.5vw, 1.2rem);
  opacity: 0.88;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.stat-item {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  padding: 1rem 0.75rem;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 900;
  color: var(--color-accent-light);
  line-height: 1;
  margin-bottom: 0.25rem;
}
.stat-unit { font-size: 0.65em; font-weight: 700; }
.stat-label { font-size: 0.8rem; opacity: 0.85; }

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: rgba(255,255,255,0.7);
  font-size: 1.5rem;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== ABOUT ===== */
.about-section { background: var(--color-bg); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.about-lead {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.about-text p { color: var(--color-text-muted); margin-bottom: 0.85rem; }

.about-highlights {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.about-highlights li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--color-text);
}
.highlight-icon { color: var(--color-accent); font-weight: 900; flex-shrink: 0; margin-top: 0.1rem; }

.about-images {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.about-img { border-radius: var(--radius-lg); width: 100%; object-fit: cover; }
.about-img-sub { aspect-ratio: 4/3; }

/* ===== SOLUTIONS ===== */
.solutions-section { background: var(--color-bg-alt); }

.solutions-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.flow-arrow {
  display: none;
  font-size: 1.5rem;
  color: var(--color-accent);
  align-self: center;
  text-align: center;
}

.flow-step {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}
.flow-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.flow-icon {
  width: 56px; height: 56px;
  margin: 0 auto 1rem;
  color: var(--color-primary);
  background: rgba(12,91,95,0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}
.flow-icon svg { width: 100%; height: 100%; }

.flow-number {
  position: absolute;
  top: 1rem; right: 1rem;
  font-size: 2rem;
  font-weight: 900;
  color: rgba(12,91,95,0.08);
  line-height: 1;
}

.flow-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}
.flow-desc { font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.6; }

.solutions-overview-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
}

/* ===== PRODUCTS ===== */
.products-section { background: var(--color-bg); }

.product-category { margin-bottom: 4rem; }

.category-title {
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--color-accent);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.category-icon { font-size: 1.4rem; }

/* Product Card */
.product-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
  margin-bottom: 2rem;
  transition: box-shadow var(--transition);
}
.product-card:hover { box-shadow: var(--shadow-lg); }

.product-card-inner {
  display: grid;
  grid-template-columns: 1fr;
}

/* Gallery */
.product-gallery {
  position: relative;
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 420px;
  background: #ffffff;
}

.gallery-main {
  position: relative;
  min-height: 360px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.gallery-img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  opacity: 0;
  transition: opacity var(--transition-slow);
}
.gallery-img.active { opacity: 1; }
.gallery-dots {
  display: flex;
  gap: 6px;
  justify-content: center;
  padding: 0 0 1.4rem;
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  padding: 0;
}
.dot.active { background: var(--color-primary); transform: scale(1.3); }
.dot:hover { background: var(--color-primary-light); }

/* Product Info */
.product-info { padding: 1.75rem 1.5rem; }

.product-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(12,91,95,0.1);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  margin-bottom: 0.75rem;
}
.product-badge-accent {
  background: rgba(216,156,50,0.15);
  color: var(--color-accent-dark);
}

.product-title {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.product-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

/* Spec Table */
.spec-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  min-width: 280px;
}
.spec-table th, .spec-table td {
  padding: 0.55rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
.spec-table tr:last-child th,
.spec-table tr:last-child td { border-bottom: none; }
.spec-table th {
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  font-weight: 600;
  white-space: nowrap;
  width: 40%;
}
.spec-table td { color: var(--color-text); font-weight: 500; }
.spec-table tr:hover td { background: rgba(12,91,95,0.03); }

/* Feature Tags */
.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: background var(--transition), color var(--transition);
}
.tag:hover { background: rgba(12,91,95,0.08); color: var(--color-primary); }
.tag-highlight {
  background: rgba(216,156,50,0.12);
  color: var(--color-accent-dark);
  border-color: rgba(216,156,50,0.3);
}

/* Competitor Compare */
.competitor-compare {
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}
.compare-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.compare-bars { display: flex; flex-direction: column; gap: 0.6rem; }
.compare-bar-item {
  display: grid;
  grid-template-columns: 60px 1fr 60px;
  align-items: center;
  gap: 0.5rem;
}
.compare-label { font-size: 0.78rem; font-weight: 600; color: var(--color-text); }
.compare-value { font-size: 0.78rem; font-weight: 700; color: var(--color-text); text-align: right; }
.compare-bar-track {
  height: 10px;
  background: var(--color-border);
  border-radius: 100px;
  overflow: hidden;
}
.compare-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 100px;
  transition: width 1s ease;
}
.compare-bar-b { background: var(--color-text-light); }
.compare-bar-c { background: var(--color-border); }

/* System Composition */
.system-composition {
  background: rgba(12,91,95,0.05);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}
.compose-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.compose-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}
.compose-tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 100px;
}
.compose-arrow { color: var(--color-accent); font-weight: 700; font-size: 0.9rem; }

/* Product Group (mini cards) */
.product-group { margin-top: 2rem; }
.product-group-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1.25rem;
  padding-left: 0.75rem;
  border-left: 4px solid var(--color-accent);
}
.product-group-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.product-mini-card {
  display: flex;
  flex-direction: column;
  align-self: start;
  background: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}
.product-mini-card:hover { box-shadow: var(--shadow-md); }
.mini-card-img {
  width: 100%;
  height: 180px;
  object-fit: contain;
  background: var(--color-bg-alt);
  padding: 1rem;
}
.mini-card-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem;
}
.mini-card-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0;
  min-height: 2.5em;
}

.product-mini-card .spec-table-wrap {
  margin-bottom: 0;
}

.product-mini-card .btn {
  display: none;
}

/* ===== PARTNERS ===== */
.partners-section { background: var(--color-bg-alt); }

.partners-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}
.partner-name {
  padding: 0.6rem 1.25rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-muted);
  box-shadow: var(--shadow-sm);
  transition: color var(--transition), border-color var(--transition);
}
.partner-name:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* ===== CASES ===== */
.cases-section { background: var(--color-bg); }

.cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.case-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.case-img-wrap {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.case-img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.case-card:hover .case-img { transform: scale(1.04); }

.case-badge {
  position: absolute;
  top: 1rem; left: 1rem;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
}

.case-info { padding: 1.5rem; }
.case-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 0.6rem;
}
.case-desc { font-size: 0.875rem; color: var(--color-text-muted); margin-bottom: 1rem; line-height: 1.6; }

.case-stats {
  display: flex;
  gap: 1.5rem;
}
.case-stat-num {
  display: block;
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}
.case-stat-label { font-size: 0.75rem; color: var(--color-text-muted); }

/* ===== ADVANTAGES ===== */
.advantages-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
}
.advantages-section .section-title { color: var(--color-white); }
.advantages-section .section-eyebrow { color: var(--color-accent-light); }

.advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.advantage-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: background var(--transition), transform var(--transition);
}
.advantage-card:hover { background: rgba(255,255,255,0.13); transform: translateY(-4px); }

.advantage-icon {
  width: 60px; height: 60px;
  margin: 0 auto 1.25rem;
  color: var(--color-accent-light);
  background: rgba(216,156,50,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
}
.advantage-icon svg { width: 100%; height: 100%; }

.advantage-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 0.6rem;
}
.advantage-desc { font-size: 0.875rem; color: rgba(255,255,255,0.75); line-height: 1.7; }

/* ===== SERVICE ===== */
.service-section { background: var(--color-bg-alt); }

.service-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  counter-reset: none;
}

.service-step {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.service-step:hover { box-shadow: var(--shadow-md); }

.step-num {
  flex-shrink: 0;
  width: 44px; height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
}

.step-title {
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 0.3rem;
}
.step-desc { font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.6; }

/* ===== FAQ ===== */
.faq-section { background: var(--color-bg); }

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
  list-style: none;
  transition: background var(--transition);
  user-select: none;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question:hover { background: var(--color-bg-alt); }

.faq-icon {
  flex-shrink: 0;
  width: 24px; height: 24px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  transition: transform var(--transition), background var(--transition);
}
details[open] .faq-icon {
  transform: rotate(45deg);
  background: var(--color-accent);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

/* ===== CONTACT ===== */
.contact-section {
  position: relative;
  padding: 5rem 0;
  overflow: hidden;
}

.contact-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.contact-bg-img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.contact-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8,68,70,0.95) 0%, rgba(10,22,40,0.92) 100%);
}

.contact-section .container { position: relative; z-index: 1; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.contact-info { color: var(--color-white); }
.contact-info .section-title { color: var(--color-white); }
.contact-info .section-eyebrow { color: var(--color-accent-light); }

.contact-lead {
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 2rem;
  line-height: 1.75;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  font-style: normal;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.contact-icon { font-size: 1.25rem; flex-shrink: 0; margin-top: 0.1rem; }
.contact-item strong { display: block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; color: var(--color-accent-light); margin-bottom: 0.2rem; }
.contact-item p { font-size: 0.9rem; color: rgba(255,255,255,0.8); margin: 0; }
.contact-link { color: rgba(255,255,255,0.9); transition: color var(--transition); }
.contact-link:hover { color: var(--color-accent-light); }

/* Contact Form */
.contact-form-wrap {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 2rem 1.75rem;
  box-shadow: var(--shadow-xl);
}

.form-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.form-group { margin-bottom: 1.1rem; }

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.4rem;
}
.required { color: var(--color-accent-dark); }

.form-input {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(12,91,95,0.12);
}
.form-input::placeholder { color: var(--color-text-light); }
.form-select { cursor: pointer; }
.form-textarea { resize: vertical; min-height: 120px; }

.phone-input-row {
  display: grid;
  grid-template-columns: minmax(130px, 0.42fr) minmax(0, 1fr);
  gap: 0.65rem;
}

.country-code-select {
  padding-right: 0.75rem;
  white-space: nowrap;
}

.form-note {
  font-size: 0.78rem;
  color: var(--color-text-light);
  margin-top: 0.75rem;
  text-align: center;
  line-height: 1.5;
}

.mail-fallback {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 0.75rem;
  text-align: center;
  line-height: 1.55;
}

.mail-fallback a {
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.75);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}
.footer-logo .logo-zh { font-size: 1.3rem; font-weight: 800; color: var(--color-white); }
.footer-logo .logo-en { font-size: 0.65rem; font-weight: 600; letter-spacing: 0.2em; opacity: 0.7; }

.footer-tagline { font-size: 0.875rem; line-height: 1.6; margin-bottom: 0.5rem; }
.footer-since { font-size: 0.8rem; color: var(--color-accent-light); }

.footer-nav-title {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 1rem;
}
.footer-nav ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-nav a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--color-accent-light); }

.footer-contact address { font-style: normal; }
.footer-contact p { font-size: 0.875rem; margin-bottom: 0.5rem; line-height: 1.6; }
.footer-contact a { color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-contact a:hover { color: var(--color-accent-light); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: center;
}
.footer-copy, .footer-icp { font-size: 0.78rem; color: rgba(255,255,255,0.4); }

@media (max-width: 420px) {
  .phone-input-row {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   RESPONSIVE — 768px (tablet)
   ============================================================ */
@media (min-width: 768px) {
  :root {
    --container-pad: 2rem;
    --section-pad: 5rem 0;
  }

  /* Nav */
  .nav-toggle { display: none; }
  .nav-menu {
    display: flex !important;
    position: static;
    flex-direction: row;
    background: none;
    padding: 0;
    gap: 0.25rem;
    max-height: none;
    overflow: visible;
    align-items: center;
  }
  .nav-link {
    padding: 0.5rem 0.85rem;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.9);
    border-radius: var(--radius-sm);
  }
  .nav-link:hover { background: rgba(255,255,255,0.1); }
  .nav-cta {
    background: var(--color-accent);
    color: var(--color-white) !important;
    padding: 0.5rem 1.1rem;
    border-radius: var(--radius-md);
  }
  .nav-cta:hover { background: var(--color-accent-dark) !important; }

  .nav-lang {
    padding: 0 0 0 0.25rem;
  }

  .nav-dropdown { position: relative; }
  .dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--color-primary-dark);
    border-radius: var(--radius-md);
    padding: 0.5rem 0;
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    z-index: 100;
  }
  .nav-dropdown:hover .dropdown-menu,
  .nav-dropdown.open .dropdown-menu { display: block; }
  .dropdown-menu a { padding: 0.6rem 1.25rem; font-size: 0.875rem; }

  /* Hero */
  .hero-stats { grid-template-columns: repeat(4, 1fr); }

  /* About */
  .about-grid { grid-template-columns: 1fr 1fr; }
  .about-images { grid-template-columns: 1fr; }

  /* Solutions */
  .solutions-flow {
    grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
    align-items: start;
  }
  .flow-arrow { display: flex; padding-top: 2.5rem; }

  /* Products */
  .product-card-inner { grid-template-columns: 1fr 1fr; }
  .product-card-reverse .product-gallery { order: 2; }
  .product-card-reverse .product-info { order: 1; }

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

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

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

  /* Service */
  .service-steps { grid-template-columns: repeat(2, 1fr); }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr 1fr; align-items: start; }

  /* Footer */
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1.5fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; text-align: left; }
}

/* ============================================================
   RESPONSIVE — 1024px (desktop)
   ============================================================ */
@media (min-width: 1024px) {
  :root {
    --container-pad: 2.5rem;
    --section-pad: 6rem 0;
  }

  /* Nav */
  .nav-link { font-size: 0.95rem; padding: 0.5rem 1rem; }

  /* Hero */
  .hero-content { padding: 3rem 2rem; }

  /* About */
  .about-grid { gap: 4rem; }

  /* Products */
  .product-info { padding: 2.5rem 2rem; }

  /* Cases */
  .cases-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }

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

  /* Service */
  .service-steps { grid-template-columns: repeat(3, 1fr); }

  /* Contact */
  .contact-form-wrap { padding: 2.5rem; }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .site-header, .hero-scroll, .nav-toggle, .hero-actions { display: none; }
  .hero { min-height: auto; padding: 2rem 0; }
  .hero-overlay { background: rgba(0,0,0,0.5); }
  * { box-shadow: none !important; }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}