/* ===== Variables ===== */
:root {
  --color-primary: #1a365d;
  --color-primary-dark: #102a4c;
  --color-primary-light: #2c5282;
  --color-accent: #c53030;
  --color-accent-hover: #9b2c2c;
  --color-gold: #d69e2e;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-bg: #ffffff;
  --color-bg-alt: #f7fafc;
  --color-bg-dark: #edf2f7;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 16px;
  --container: 1200px;
  --header-height: 80px;
  --transition: 0.3s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }

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

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226,232,240,0.8);
  height: var(--header-height);
  transition: var(--transition);
}

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

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

.logo-mark {
  width: 44px; height: 44px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 18px; letter-spacing: -1px;
}

.logo-text {
  display: flex; flex-direction: column; line-height: 1.2;
}

.logo-text strong {
  font-size: 16px; color: var(--color-primary);
}

.logo-text span {
  font-size: 12px; color: var(--color-text-light); font-weight: 500;
}

.nav-desktop {
  display: flex; align-items: center; gap: 32px;
}

.nav-desktop a {
  font-size: 15px; font-weight: 500; color: var(--color-text);
  position: relative;
}

.nav-desktop a::after {
  content: ''; position: absolute; bottom: -6px; left: 0;
  width: 0; height: 2px; background: var(--color-accent);
  transition: var(--transition);
}

.nav-desktop a:hover::after { width: 100%; }

.nav-desktop a.nav-cta {
  background: var(--color-primary); color: #fff;
  padding: 10px 20px; border-radius: 4px;
}

.nav-desktop a.nav-cta:hover {
  background: var(--color-accent); transform: translateY(-2px);
}

.nav-desktop a.nav-cta::after { display: none; }

.nav-actions {
  display: flex; align-items: center; gap: 16px;
}

.lang-toggle {
  display: flex; align-items: center; gap: 4px;
  background: var(--color-bg-alt); border: 1px solid var(--color-border);
  border-radius: 20px; padding: 6px 14px; cursor: pointer;
  font-size: 13px; font-weight: 600; color: var(--color-text);
  transition: var(--transition);
}

.lang-toggle:hover { background: var(--color-bg-dark); }

.lang-current { color: var(--color-accent); }
.lang-separator { color: var(--color-text-light); }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}

.menu-toggle span {
  width: 24px; height: 2px; background: var(--color-primary);
  transition: var(--transition);
}

.mobile-menu {
  position: fixed; top: var(--header-height); left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.98); backdrop-filter: blur(12px);
  z-index: 999; transform: translateX(100%); transition: var(--transition);
  display: flex; flex-direction: column; padding: 32px 24px; gap: 20px;
}

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

.mobile-menu a {
  font-size: 18px; font-weight: 600; color: var(--color-primary);
  border-bottom: 1px solid var(--color-border); padding-bottom: 12px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; border-radius: 6px; font-weight: 600;
  font-size: 15px; transition: var(--transition); cursor: pointer; border: none;
}

.btn-primary {
  background: var(--color-accent); color: #fff;
  box-shadow: 0 4px 14px rgba(197,48,48,0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover); transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(197,48,48,0.35);
}

.btn-outline {
  background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.6);
}

.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }

.btn-block { width: 100%; }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: calc(var(--header-height) + 60px) 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background-size: cover; background-position: center;
  transform: scale(1.05); transition: transform 10s ease;
}

.hero:hover .hero-bg { transform: scale(1); }

.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(26,54,93,0.88) 0%, rgba(16,42,76,0.75) 50%, rgba(0,0,0,0.5) 100%);
}

.hero-content {
  position: relative; z-index: 2; color: #fff; text-align: center;
  max-width: 900px;
}

.hero-tag {
  display: inline-block; background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25); border-radius: 30px;
  padding: 8px 20px; font-size: 14px; font-weight: 500;
  letter-spacing: 1px; text-transform: uppercase; margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(32px, 5vw, 56px); font-weight: 900;
  line-height: 1.15; margin-bottom: 24px; letter-spacing: -0.5px;
}

.hero-title span { display: block; }

.hero-desc {
  font-size: clamp(16px, 2vw, 20px); color: rgba(255,255,255,0.85);
  margin-bottom: 36px; line-height: 1.8; max-width: 760px; margin-left: auto; margin-right: auto;
}

.hero-actions {
  display: flex; gap: 16px; justify-content: center; margin-bottom: 60px;
}

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  background: rgba(255,255,255,0.1); backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2); border-radius: var(--radius-lg);
  padding: 28px;
}

.stat-item strong {
  display: block; font-size: 32px; font-weight: 900; color: #fff;
  margin-bottom: 4px;
}

.stat-item span {
  font-size: 13px; color: rgba(255,255,255,0.75); font-weight: 500;
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center; max-width: 760px; margin: 0 auto 60px;
}

.section-tag {
  display: inline-block; color: var(--color-accent); font-weight: 700;
  font-size: 14px; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 40px); font-weight: 900;
  color: var(--color-primary); margin-bottom: 18px; line-height: 1.3;
}

.section-subtitle {
  font-size: 17px; color: var(--color-text-light); line-height: 1.8;
}

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

.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}

.about-image img {
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  width: 100%; height: 520px; object-fit: cover;
}

.about-content { display: flex; flex-direction: column; gap: 32px; }

.about-block h3 {
  font-size: 22px; color: var(--color-primary); margin-bottom: 12px;
}

.about-block p {
  color: var(--color-text-light); font-size: 16px; line-height: 1.9;
}

.about-values {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
}

.value-item {
  display: flex; align-items: center; gap: 10px;
  background: var(--color-bg-alt); padding: 16px; border-radius: var(--radius);
  font-weight: 600; color: var(--color-primary);
}

.value-icon { color: var(--color-accent); }

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

.products-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}

.product-card {
  background: #fff; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }

.product-image { height: 260px; overflow: hidden; }

.product-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }

.product-card:hover .product-image img { transform: scale(1.05); }

.product-info { padding: 28px; }

.product-info h3 { font-size: 22px; color: var(--color-primary); margin-bottom: 4px; }

.product-en {
  font-size: 13px; color: var(--color-accent); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 14px;
}

.product-info p { color: var(--color-text-light); font-size: 15px; line-height: 1.8; margin-bottom: 18px; }

.product-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.product-tags span {
  background: var(--color-bg-alt); color: var(--color-primary);
  font-size: 12px; font-weight: 600; padding: 6px 12px; border-radius: 4px;
}

/* ===== Factory ===== */
.factory { background: var(--color-bg); }

.factory-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); grid-auto-rows: 280px; gap: 24px;
  margin-bottom: 60px;
}

.factory-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-md);
}

.factory-card.large { grid-column: span 2; }

.factory-card img {
  width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease;
}

.factory-card:hover img { transform: scale(1.05); }

.factory-card-caption {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(26,54,93,0.92));
  color: #fff; padding: 24px;
  transform: translateY(10px); opacity: 0.95; transition: var(--transition);
}

.factory-card:hover .factory-card-caption { transform: translateY(0); opacity: 1; }

.factory-card-caption h3 { font-size: 18px; margin-bottom: 6px; }

.factory-card-caption p { font-size: 13px; color: rgba(255,255,255,0.85); }

.factory-specs {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px;
  background: var(--color-primary); color: #fff; border-radius: var(--radius-lg);
  padding: 40px 24px;
}

.spec-item {
  text-align: center; border-right: 1px solid rgba(255,255,255,0.15);
  padding: 0 12px;
}

.spec-item:last-child { border-right: none; }

.spec-item strong {
  display: block; font-size: 28px; font-weight: 900; margin-bottom: 8px;
  color: var(--color-gold);
}

.spec-item span { font-size: 14px; color: rgba(255,255,255,0.8); }

/* ===== Quality ===== */
.quality { background: var(--color-bg-alt); }

.quality-grid {
  display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: start;
}

.cert-card {
  display: flex; gap: 24px; background: #fff; padding: 32px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); margin-bottom: 32px;
}

.cert-icon {
  width: 80px; height: 80px; border-radius: 50%; flex-shrink: 0;
  background: var(--color-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 900;
}

.cert-body h3 { font-size: 22px; color: var(--color-primary); margin-bottom: 12px; }

.cert-no { color: var(--color-accent); font-weight: 700; margin-bottom: 12px; }

.cert-body p { color: var(--color-text-light); font-size: 15px; margin-bottom: 6px; }

.quality-points { display: flex; flex-direction: column; gap: 20px; }

.q-point {
  display: flex; gap: 20px; background: #fff; padding: 24px; border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.q-num {
  font-size: 28px; font-weight: 900; color: var(--color-accent); line-height: 1;
  min-width: 44px;
}

.q-point h4 { font-size: 18px; color: var(--color-primary); margin-bottom: 6px; }

.q-point p { color: var(--color-text-light); font-size: 15px; line-height: 1.8; }

.quality-actions {
  display: flex; flex-direction: column; gap: 16px; justify-content: center;
}

.quality-actions .btn-outline {
  border-color: var(--color-primary); color: var(--color-primary);
  min-width: 180px; padding: 14px 20px;
}

.quality-actions .btn-outline:hover {
  background: var(--color-primary); color: #fff;
}

/* ===== Markets ===== */
.markets { background: var(--color-bg); }

.markets-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-bottom: 60px;
}

.market-card {
  background: var(--color-bg-alt); border-radius: var(--radius-lg); padding: 40px 32px;
  text-align: center; transition: var(--transition); border: 1px solid var(--color-border);
}

.market-card:hover {
  background: #fff; box-shadow: var(--shadow-lg); transform: translateY(-6px);
  border-color: transparent;
}

.market-icon { font-size: 48px; margin-bottom: 20px; }

.market-card h3 { font-size: 22px; color: var(--color-primary); margin-bottom: 12px; }

.market-card p { color: var(--color-text-light); font-size: 15px; line-height: 1.8; }

.markets-partners {
  background: var(--color-primary); color: #fff; border-radius: var(--radius-lg);
  padding: 40px; text-align: center;
}

.markets-partners h3 { font-size: 22px; margin-bottom: 24px; }

.partner-tags {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
}

.partner-tags span {
  background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.2);
  padding: 10px 18px; border-radius: 30px; font-size: 14px; font-weight: 500;
}

/* ===== Contact ===== */
.contact { background: var(--color-bg-alt); }

.contact-grid {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: start;
}

.contact-info { display: flex; flex-direction: column; gap: 20px; }

.contact-card {
  display: flex; gap: 18px; background: #fff; padding: 24px; border-radius: var(--radius);
  box-shadow: var(--shadow-sm); transition: var(--transition);
}

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

.contact-icon { font-size: 28px; }

.contact-card h4 { font-size: 16px; color: var(--color-primary); margin-bottom: 6px; }

.contact-card p { color: var(--color-text-light); font-size: 15px; line-height: 1.7; }

.contact-card a { color: var(--color-primary); font-weight: 600; }

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

.contact-form-wrapper {
  background: #fff; border-radius: var(--radius-lg); padding: 40px;
  box-shadow: var(--shadow-md);
}

.contact-form { display: flex; flex-direction: column; gap: 20px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.form-field { display: flex; flex-direction: column; gap: 8px; }

.form-field label { font-size: 14px; font-weight: 600; color: var(--color-primary); }

.form-field input,
.form-field select,
.form-field textarea {
  padding: 12px 16px; border: 1px solid var(--color-border); border-radius: var(--radius);
  font-size: 15px; font-family: inherit; color: var(--color-text);
  background: var(--color-bg); transition: var(--transition);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none; border-color: var(--color-primary); background: #fff;
  box-shadow: 0 0 0 3px rgba(26,54,93,0.08);
}

.form-note {
  font-size: 13px; color: var(--color-text-light); text-align: center; margin-top: 8px;
}

/* ===== Footer ===== */
.footer { background: var(--color-primary-dark); color: #fff; padding: 70px 0 30px; }

.footer .logo-text strong { color: #fff; }
.footer .logo-text span { color: rgba(255,255,255,0.6); }

.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 60px; margin-bottom: 50px;
}

.footer-brand p { color: rgba(255,255,255,0.7); margin-top: 20px; line-height: 1.8; }

.footer-links h4,
.footer-contact h4 { font-size: 16px; margin-bottom: 20px; color: #fff; }

.footer-links { display: flex; flex-direction: column; gap: 12px; }

.footer-links a { color: rgba(255,255,255,0.7); font-size: 15px; }
.footer-links a:hover { color: #fff; }

.footer-contact p { color: rgba(255,255,255,0.7); font-size: 15px; margin-bottom: 10px; }
.footer-contact a { color: rgba(255,255,255,0.85); font-weight: 600; }
.footer-contact a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}

.footer-bottom p { color: rgba(255,255,255,0.5); font-size: 13px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .nav-desktop { display: none; }
  .menu-toggle { display: flex; }
  .about-grid,
  .quality-grid,
  .contact-grid { grid-template-columns: 1fr; }
  .factory-grid { grid-template-columns: repeat(2, 1fr); }
  .factory-card.large { grid-column: span 2; }
  .factory-specs { grid-template-columns: repeat(3, 1fr); }
  .spec-item:nth-child(3) { border-right: none; }
  .spec-item:nth-child(4),
  .spec-item:nth-child(5) { border-top: 1px solid rgba(255,255,255,0.15); padding-top: 20px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .markets-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  :root { --header-height: 70px; }
  .hero { min-height: auto; padding: calc(var(--header-height) + 40px) 0 60px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .section { padding: 70px 0; }
  .products-grid,
  .factory-grid,
  .markets-grid { grid-template-columns: 1fr; }
  .factory-card.large { grid-column: span 1; }
  .factory-specs { grid-template-columns: repeat(2, 1fr); }
  .spec-item:nth-child(2) { border-right: none; }
  .spec-item:nth-child(3),
  .spec-item:nth-child(4),
  .spec-item:nth-child(5) { border-top: 1px solid rgba(255,255,255,0.15); padding-top: 20px; }
  .about-values { grid-template-columns: 1fr; }
  .quality-actions { flex-direction: row; flex-wrap: wrap; }
  .form-row { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .logo-text strong { font-size: 14px; }
  .logo-text span { font-size: 10px; }
  .logo-mark { width: 38px; height: 38px; font-size: 16px; }
  .lang-toggle { padding: 5px 10px; font-size: 12px; }
  .hero-title { font-size: 28px; }
  .hero-stats { gap: 12px; padding: 20px; }
  .stat-item strong { font-size: 24px; }
  .cert-card { flex-direction: column; align-items: center; text-align: center; }
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.hidden { display: none !important; }