:root {
  --color-primary: #E53935;
  --color-secondary: #FF5A4F;
  --color-bg-main: #F5F7FA;
  --color-bg-card: #FFFFFF;
  --color-text-main: #333333;
  --color-border: #E0E0E0;
  --header-offset: 166px;
  --color-header-top: #3a1a1a;
  --color-nav-bg: #ffffff;
  --font-family: 'Segoe UI', Arial, sans-serif;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: var(--font-family);
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
  padding-top: var(--header-offset);
}
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  font-family: var(--font-family);
}
.header-top {
  background-color: var(--color-header-top);
  width: 100%;
}
.header-container {
  max-width: 1200px;
  margin: 0 auto;
  min-height: 68px;
  padding: 0 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  display: inline-block;
  font-size: 28px;
  font-weight: 800;
  color: #ffffff;
  text-decoration: none;
  padding: 9px 6px;
  letter-spacing: 1.5px;
}
.logo:hover {
  color: var(--color-secondary);
}
.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 20px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  color: #ffffff;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(255, 90, 79, 0.5);
  color: #ffffff;
}
.main-nav {
  background-color: var(--color-nav-bg);
  width: 100%;
  display: flex;
  align-items: center;
  min-height: 52px;
  border-bottom: 1px solid var(--color-border);
  flex-direction: row;
  position: static;
  transform: none;
  transition: none;
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  padding: 0 16px;
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  gap: 20px;
  flex-wrap: nowrap;
  overflow-x: auto;
}
.nav-link {
  color: var(--color-text-main);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  line-height: 1.4;
  padding: 8px 2px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}
.nav-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.mobile-nav-buttons, .mobile-menu-btn {
  display: none;
}
.mobile-menu-overlay {
  display: none;
}
.site-footer {
  background-color: #263238;
  color: #e0e0e0;
  padding: 5px 0 0 0;
  font-family: var(--font-family);
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 35px;
  padding: 58px 20px 50px;
}
.footer-column {
  flex: 1 1 280px;
}
.footer-brand {
  flex: 1.4 1 340px;
}
.footer-logo {
  display: inline-block;
  font-size: 24px;
  font-weight: 800;
  color: #ffffff;
  text-decoration: none;
  margin-bottom: 18px;
}
.footer-logo:hover, .footer-nav a:hover {
  color: var(--color-secondary);
}
.footer-description {
  font-size: 14px;
  line-height: 1.7;
  color: #b0bec5;
  max-width: 360px;
}
.footer-heading {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  margin-bottom: 20px;
  letter-spacing: 0.6px;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}
.footer-nav a {
  color: #b0bec5;
  text-decoration: none;
  font-size: 14px;
  line-height: 1.6;
  transition: color 0.2s ease;
  padding: 2px 0;
}
.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: #b0bec5;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 18px 20px;
  text-align: center;
  font-size: 14px;
  color: #90a4ae;
  background-color: #1c262b;
}
.footer-bottom p {
  margin: 0;
}
@media (max-width: 768px) {
  :root {
    --header-offset: 146px;
  }
  .header-container {
    width: 100%;
    max-width: none;
    min-height: 60px;
    padding: 0 15px;
    gap: 10px;
  }
  .logo {
    font-size: 22px;
    padding: 6px 4px;
    flex-shrink: 0;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .mobile-nav-buttons {
    display: flex;
    justify-content: center;
    padding: 5px 15px;
    min-height: 48px;
    background-color: var(--color-header-top);
    gap: 12px;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    position: relative;
    z-index: 10;
  }
  .mobile-nav-buttons .btn {
    padding: 7px 16px;
    font-size: 13px;
    min-height: 34px;
  }
  .main-nav {
    position: fixed;
    top: 108px;
    left: 0;
    width: 82%;
    max-width: 320px;
    min-height: auto;
    background-color: #ffffff;
    flex-direction: column;
    align-items: stretch;
    z-index: 1001;
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.25);
    border-bottom-right-radius: 10px;
    display: none;
    overflow-y: auto;
    max-height: calc(100vh - 110px);
    transition: transform 0.3s ease;
    transform: translateX(-100%);
  }
  .main-nav.active {
    display: block;
    transform: translateX(0);
  }
  .nav-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    align-items: stretch;
    padding: 15px 25px;
    gap: 0;
    overflow-x: visible;
  }
  .nav-link {
    display: block;
    padding: 12px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--color-border);
    white-space: normal;
  }
  .mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.55);
    z-index: 1000;
  }
  .mobile-menu-overlay.active {
    display: block;
  }
  .site-footer {
    text-align: left;
  }
  .footer-container {
    flex-direction: column;
    padding: 40px 20px 30px;
    gap: 25px;
  }
  .footer-column {
    flex: 1 1 auto;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  body {
    overflow-x: hidden;
  }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}
/* 内容保护（系统追加，请勿删除） */
body {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
input, textarea, select, [contenteditable="true"] {
  -webkit-user-select: text;
  -moz-user-select: text;
  user-select: text;
}