:root {
  --color-primary: #1e3a5f;
  --color-primary-light: #2a5080;
  --color-accent: #2d6a4f;
  --color-accent-light: #40916c;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-text: #1a2332;
  --color-text-muted: #5c6b7a;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(30, 58, 95, 0.08);
  --shadow-md: 0 8px 30px rgba(30, 58, 95, 0.12);
  --radius: 12px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

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

a {
  color: inherit;
  text-decoration: none;
}

address {
  font-style: normal;
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.site-header.scrolled {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 10px;
  letter-spacing: 0.05em;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.logo-text strong {
  font-size: 0.95rem;
  color: var(--color-primary);
}

.logo-text small {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--color-primary);
}

.lang-switch {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  margin-left: 0.5rem;
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: background 0.2s, color 0.2s;
}

.lang-btn.active {
  background: var(--color-primary);
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--header-h);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(30, 58, 95, 0.94) 0%, rgba(45, 106, 79, 0.85) 100%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 4rem 0 2rem;
  color: #fff;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  opacity: 0.92;
  margin-bottom: 2rem;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.hero-tag {
  font-size: 0.9rem;
  opacity: 0.85;
  padding-left: 1rem;
  border-left: 2px solid rgba(255, 255, 255, 0.4);
}

.hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 2rem 0 4rem;
}

.stat-card {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  color: #fff;
  backdrop-filter: blur(8px);
}

.stat-card strong {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-card span {
  font-size: 0.8rem;
  opacity: 0.8;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: #fff;
  color: var(--color-primary);
}

.btn-primary:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  background: var(--color-primary);
  color: #fff;
  border: none;
}

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

.btn-block {
  width: 100%;
}

/* Sections */
.section {
  padding: 5rem 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-stat {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.about-stat strong {
  display: block;
  font-size: 1.4rem;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.about-stat span {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Products */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.product-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: box-shadow 0.3s, transform 0.3s;
}

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

.product-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.product-card h3 {
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  font-size: 1.15rem;
}

.product-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

/* Equipment table */
.table-wrap {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.equipment-table {
  width: 100%;
  border-collapse: collapse;
}

.equipment-table th,
.equipment-table td {
  padding: 1rem 1.5rem;
  text-align: left;
}

.equipment-table thead {
  background: var(--color-primary);
  color: #fff;
}

.equipment-table th {
  font-weight: 600;
  font-size: 0.9rem;
}

.equipment-table tbody tr {
  border-bottom: 1px solid var(--color-border);
}

.equipment-table tbody tr:last-child {
  border-bottom: none;
}

.equipment-table tbody tr:nth-child(even) {
  background: var(--color-bg-alt);
}

.equipment-table .qty {
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
  width: 120px;
}

/* Workshop */
.workshop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.workshop-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.workshop-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.workshop-icon {
  width: 36px;
  height: 36px;
  background: var(--color-bg-alt);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.workshop-card h3 {
  color: var(--color-primary);
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.workshop-en {
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.workshop-card > p:last-child {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Certification */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: 640px;
  margin-inline: auto;
}

.cert-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.cert-badge {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 50%;
  margin-bottom: 1rem;
}

.cert-card h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.cert-status {
  display: inline-block;
  padding: 4px 12px;
  background: #fff3cd;
  color: #856404;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
}

.cert-note {
  text-align: center;
  margin-top: 2rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Contact */
.contact-section {
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, #fff 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.info-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.info-item strong,
.info-item address {
  font-size: 1.05rem;
  color: var(--color-primary);
}

.info-phone {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent);
}

.info-phone:hover {
  text-decoration: underline;
}

.wechat-block {
  margin-top: 0.5rem;
}

.wechat-qr {
  margin: 0.75rem 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #fff;
  width: 180px;
  height: auto;
}

.wechat-hint {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.contact-form-wrap {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.contact-form-wrap h3 {
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
}

.inquiry-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.inquiry-form label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.inquiry-form label span {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text);
}

.inquiry-form input,
.inquiry-form textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.form-result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--color-bg-alt);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.form-result p {
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.form-result pre {
  background: #fff;
  padding: 1rem;
  border-radius: 6px;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 1rem;
  border: 1px solid var(--color-border);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.88rem;
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--delay, 0s);
}

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

/* Responsive */
@media (max-width: 900px) {
  .about-grid,
  .product-grid,
  .workshop-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .btn,
  .lang-btn,
  .nav-toggle {
    min-height: 44px;
    min-width: 44px;
  }

  .info-phone {
    font-size: 1.25rem;
    padding: 0.25rem 0;
    display: inline-block;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav a {
    padding: 0.85rem 0.5rem;
    border-bottom: 1px solid var(--color-border);
  }

  .lang-switch {
    margin: 0.75rem 0.5rem 0;
    align-self: flex-start;
  }

  .section {
    padding: 3.5rem 0;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}