/* ========== CSS Variables ========== */
:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1E40AF;
  --color-primary-light: #DBEAFE;
  --color-primary-bg: #EFF6FF;
  --color-primary-50: #EBF5FF;
  --color-accent: #EA580C;
  --color-accent-dark: #C2410C;
  --color-accent-light: #FFEDD5;
  --color-accent-bg: #FFF7ED;
  --color-dark: #0F172A;
  --color-gray-900: #0F172A;
  --color-gray-800: #1E293B;
  --color-gray-700: #334155;
  --color-gray-600: #475569;
  --color-gray-500: #64748B;
  --color-gray-400: #94A3B8;
  --color-gray-300: #CBD5E1;
  --color-gray-200: #E2E8F0;
  --color-gray-100: #F1F5F9;
  --color-gray-50: #F8FAFC;
  --color-white: #FFFFFF;
  --color-cta-bg-start: #1E3A8A;
  --color-cta-bg-end: #2563EB;
  --color-card-cool-start: #DBEBFF;
  --color-card-cool-end: #3B62F5;
  --color-card-heat-start: #FFEDCF;
  --color-card-heat-end: #F26E1F;
  --color-card-heat2-start: #FFE0B8;
  --color-card-heat2-end: #EE5D12;
  --font-family: 'PingFang SC', 'Microsoft YaHei', 'Sarasa Gothic SC', 'Hiragino Sans', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Fluid spacing — scales from mobile to desktop automatically */
  --space-section-y: clamp(48px, 7vw, 80px);
  --space-section-x: clamp(20px, 5vw, 80px);
  --space-section-x-lg: clamp(20px, 6vw, 96px);
}

/* ========== Reset ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; scroll-behavior: smooth; }
body { font-family: var(--font-family); background: var(--color-gray-900); overflow-x: hidden; }

/* ========== Page Wrapper — TRUE FLUID, no transform ========== */
.page-wrapper {
  width: 100%;
  max-width: 1920px;
  margin: 0 auto;
  background: var(--color-gray-50);
  min-height: 100vh;
}

/* ========== Header / Nav ========== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 72px;
  padding: 0 var(--space-section-x);
  background: var(--color-white);
  border-bottom: 1px solid #DFE3E8;
  position: sticky;
  top: 0;
  z-index: 100;
  flex-wrap: nowrap;
  gap: 16px;
}

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

.header-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header-logo-icon svg { width: 18px; height: 18px; }
.header-logo-text { font-size: clamp(15px, 1.5vw, 18px); font-weight: 700; color: var(--color-gray-900); white-space: nowrap; }

.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 36px);
  list-style: none;
  margin: 0;
  padding: 0;
}

.header-nav a {
  font-size: clamp(14px, 1vw, 15px);
  font-weight: 400;
  color: var(--color-gray-600);
  text-decoration: none;
  transition: color 0.2s ease;
  white-space: nowrap;
}
.header-nav a.active { font-weight: 500; color: var(--color-primary); }
.header-nav a:hover { color: var(--color-primary); }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ========== Language Switcher ========== */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--color-gray-100);
  border-radius: 8px;
  padding: 3px;
}

.lang-btn {
  padding: 5px 10px;
  border: none;
  background: none;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-gray-500);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  font-family: var(--font-family);
}

.lang-btn:hover { color: var(--color-gray-700); }
.lang-btn.active {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* ========== Buttons ========== */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background 0.2s ease, transform 0.15s ease;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-cta:hover { background: var(--color-primary-dark); transform: translateY(-1px); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: clamp(14px, 1.2vw, 16px);
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
  transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); box-shadow: 0 12px 28px rgba(37, 99, 235, 0.4); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: clamp(14px, 1.2vw, 16px);
  font-weight: 500;
  color: var(--color-gray-700);
  background: var(--color-white);
  border: 1px solid var(--color-gray-300);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.btn-secondary:hover { background: var(--color-gray-100); border-color: var(--color-gray-400); }

.btn-cta-large {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  border-radius: 12px;
  font-size: clamp(15px, 1.3vw, 17px);
  font-weight: 600;
  color: var(--color-primary-dark);
  background: var(--color-white);
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.btn-cta-large:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28); }

/* ========== Section Shared ========== */
.section { width: 100%; }
.section-bg-light { background: var(--color-gray-50); }
.section-bg-white { background: var(--color-white); }
.section-bg-dark { background: var(--color-gray-900); }

.section-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.section-title {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  color: var(--color-gray-900);
  line-height: 1.3;
}

.section-subtitle {
  font-size: clamp(14px, 1.2vw, 16px);
  font-weight: 400;
  color: var(--color-gray-500);
}

/* ========== Page Banner ========== */
.page-banner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(40px, 6vw, 72px) var(--space-section-x) clamp(32px, 4vw, 56px);
  gap: 16px;
  background: linear-gradient(135deg, #EBF5FF 0%, #EBF5FF 50%, #FFF8EF 100%);
}
.page-banner-eyebrow { display: flex; align-items: center; gap: 8px; }
.page-banner-eyebrow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-primary); }
.page-banner-eyebrow-text { font-size: 14px; font-weight: 600; color: var(--color-primary); }
.page-banner-title { font-size: clamp(26px, 4vw, 44px); font-weight: 700; color: var(--color-gray-900); line-height: 1.2; letter-spacing: -1px; }
.page-banner-subtitle { font-size: clamp(14px, 1.2vw, 16px); font-weight: 400; color: var(--color-gray-500); line-height: 28px; max-width: 680px; }

/* ========== Contact Modal ========== */
.contact-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  z-index: 1100;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.contact-overlay.active { display: flex; }
.contact-modal {
  background: var(--color-white);
  border-radius: 20px;
  padding: clamp(24px, 3.5vw, 36px);
  max-width: 460px;
  width: 100%;
  position: relative;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.25);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  scrollbar-width: none;        /* Firefox: 隐藏滚动条 */
  -ms-overflow-style: none;     /* IE/Edge: 隐藏滚动条 */
}
.contact-modal::-webkit-scrollbar { display: none; }  /* Chrome/Safari: 隐藏滚动条 */
.contact-modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border: none;
  background: var(--color-gray-100);
  border-radius: 50%;
  font-size: 20px;
  color: var(--color-gray-600);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}
.contact-modal-close:hover { background: var(--color-gray-200); }
.contact-modal-title { font-size: 24px; font-weight: 700; color: var(--color-gray-900); margin-bottom: 6px; }
.contact-modal-subtitle { font-size: 14px; color: var(--color-gray-500); margin-bottom: 18px; }
.contact-modal-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px;
  border-radius: 12px;
  background: var(--color-gray-50);
  margin-bottom: 10px;
  transition: background 0.2s ease;
}
.contact-modal-item:last-child { margin-bottom: 0; }
.contact-modal-item:hover { background: var(--color-gray-100); }
.contact-modal-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--color-primary-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-modal-label { font-size: 12px; color: var(--color-gray-400); margin-bottom: 2px; }
.contact-modal-value { font-size: 16px; font-weight: 600; color: var(--color-gray-900); text-decoration: none; }
a.contact-modal-value:hover { color: var(--color-primary); }

/* Contact modal social (reflects admin-configured accounts; hidden when none set) */
.contact-modal-social {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-gray-100);
}
.contact-modal-social-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-gray-600);
  margin-bottom: 10px;
}
.contact-modal-social-icons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.contact-modal-social-icons .footer-social-icon { width: 40px; height: 40px; }
.contact-modal-social-icons .footer-social-icon svg { width: 22px; height: 22px; }

/* ========== Footer ========== */
.footer {
  padding: clamp(40px, 5vw, 56px) var(--space-section-x) clamp(24px, 3vw, 32px);
  background: var(--color-gray-900);
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 3vw, 40px);
}

.footer-main {
  display: flex;
  gap: clamp(24px, 4vw, 64px);
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-col.company {
  flex: 1;
  min-width: 280px;
  max-width: 480px;
  gap: 16px;
}

.footer-col.contact {
  flex: 0 1 360px;
  min-width: 240px;
  gap: 12px;
}

.footer-logo {
  font-size: clamp(15px, 1.3vw, 17px);
  font-weight: 700;
  color: var(--color-gray-50);
}

.footer-desc {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-gray-400);
  line-height: 22px;
}

.footer-contact-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--color-gray-400);
  line-height: 22px;
}

.footer-contact-item svg {
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-contact-item-label {
  color: var(--color-gray-500);
  font-size: 12px;
  margin-bottom: 2px;
}

.footer-contact-item-value {
  color: var(--color-gray-200);
  font-weight: 500;
  text-decoration: none;
}

a.footer-contact-item-value:hover { color: var(--color-white); }

/* Social media */
.footer-social {
  margin-top: 0;
}
.footer-social-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-gray-500);
  margin-bottom: 10px;
}
.footer-social-icons {
  display: flex;
  gap: 10px;
}
.footer-social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: rgba(100, 116, 139, 0.15);
  color: var(--color-gray-400);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}
.footer-social-icon:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}
.footer-social-icon svg {
  width: 20px; height: 20px;
}

/* Contact card "follow us" social (reflects admin-configured accounts) */
.contact-card-social {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.contact-card-social .footer-social-icon {
  width: 32px;
  height: 32px;
}
.contact-card-social .footer-social-icon svg {
  width: 18px;
  height: 18px;
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid rgba(51, 65, 85, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-copyright {
  font-size: 12px;
  font-weight: 400;
  color: var(--color-gray-500);
  text-align: center;
}

/* ========== Mobile Nav Toggle ========== */
.mobile-menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px;
  flex-shrink: 0;
}
.mobile-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gray-700);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ========== Responsive Breakpoints ========== */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
  .header-nav { gap: 20px; }
  .header-logo-text { font-size: 15px; }
  .lang-btn { padding: 4px 8px; font-size: 11px; }
}

/* Mobile (<= 768px) */
@media (max-width: 768px) {
  .header {
    padding: 0 16px;
    height: 60px;
    gap: 8px;
  }

  .header-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 20px;
    gap: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    z-index: 99;
  }

  .header-nav.open { display: flex; }

  .header .btn-cta { padding: 8px 14px; font-size: 12px; }
  .mobile-menu-toggle { display: flex; }

  .lang-switcher { padding: 2px; }
  .lang-btn { padding: 4px 7px; font-size: 11px; }

  .footer-main {
    flex-direction: column;
    gap: 24px;
  }

  .footer-col.company,
  .footer-col.contact {
    max-width: 100%;
    width: 100%;
  }

  .footer-contact-items { gap: 12px; }
}

/* Small Mobile (<= 480px) */
@media (max-width: 480px) {
  .header { padding: 0 12px; gap: 6px; }
  .header-logo-text { display: none; }
  /* Keep language switcher visible on mobile (it was hidden before) */
  .lang-switcher { display: flex; padding: 2px; }
  .lang-btn { padding: 3px 6px; font-size: 11px; }
  .header-right { gap: 6px; }
  .header .btn-cta { padding: 7px 12px; font-size: 11px; }

  .footer {
    padding: 32px 16px 20px;
    gap: 20px;
  }

  .footer-contact-item {
    font-size: 12px;
  }
}