:root {
  --header-offset: 120px;
  --primary: #E53935;
  --primary-dark: #C62828;
  --primary-light: #FFCDD2;
  --accent: #FF5A4F;
  --gradient-btn: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  --card-bg: #FFFFFF;
  --bg-page: #F5F7FA;
  --text-main: #333333;
  --border-color: #E0E0E0;
}
body {
  margin: 0;
  padding: 0;
  padding-top: var(--header-offset, 120px);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
}
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  background: var(--card-bg);
  min-height: auto;
}
.header-top {
  background-color: var(--primary-dark);
  width: 100%;
}
.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  box-sizing: border-box;
}
.logo {
  font-size: 26px;
  font-weight: 800;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: 1px;
  text-transform: uppercase;
  display: inline-block;
  line-height: 1.2;
}
.logo:hover {
  color: #ffe0de;
}
.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  border: none;
  line-height: 1.4;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  font-family: inherit;
}
.btn-primary {
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  color: #ffffff;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(229, 57, 53, 0.35);
  opacity: 0.95;
}
.main-nav {
  background-color: #ffffff;
  width: 100%;
  display: flex;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: static;
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding: 0 20px;
  width: 100%;
  box-sizing: border-box;
}
.nav-menu {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  flex: 1;
  flex-wrap: nowrap;
}
.nav-menu a {
  color: #333333;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 12px 20px;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color 0.3s ease, border-color 0.3s ease;
  text-align: center;
  line-height: 1.4;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.hamburger-menu {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1002;
  position: relative;
  width: 42px;
  height: 42px;
  padding: 8px;
  box-sizing: border-box;
}
.hamburger-menu span {
  display: block;
  width: 24px;
  height: 2px;
  background: #ffffff;
  margin: 5px auto;
  transition: all 0.4s ease;
  border-radius: 1px;
}
.hamburger-menu.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}
.hamburger-menu.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s ease;
  cursor: pointer;
  backdrop-filter: blur(2px);
}
.mobile-nav-buttons {
  display: none;
  background-color: var(--primary-dark);
  padding: 8px 16px;
  justify-content: center;
  gap: 10px;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.page-content {
  padding: 10px 20px 40px;
  max-width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
}
.site-footer {
  background-color: #2d2d2d;
  color: #f5f5f5;
  margin-top: 40px;
  padding: 0;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 20px;
  box-sizing: border-box;
}
.footer-grid {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.footer-info {
  flex: 1;
  min-width: 250px;
}
.footer-logo {
  font-size: 24px;
  font-weight: 800;
  color: #ffffff;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  display: inline-block;
  margin-bottom: 12px;
}
.footer-info p {
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.9;
  margin-top: 8px;
}
.footer-links {
  flex: 0 0 auto;
  min-width: 220px;
}
.footer-links h4 {
  font-size: 16px;
  color: #ffffff;
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-nav a {
  color: #dddddd;
  text-decoration: none;
  font-size: 14px;
  padding: 5px 0;
  transition: all 0.3s ease;
  border-bottom: 1px solid transparent;
  line-height: 1.4;
}
.footer-nav a:hover {
  color: #ffffff;
  padding-left: 8px;
  border-bottom-color: rgba(255,255,255,0.3);
}
.footer-bottom {
  background-color: #2a2a2a;
  padding: 14px 20px;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-bottom p {
  margin: 0;
  font-size: 13px;
  opacity: 0.85;
  line-height: 1.5;
}
@media (max-width: 768px) {
  :root {
    --header-offset: 108px;
  }
  .header-container {
    width: 100%;
    max-width: none;
    padding: 12px 16px;
    gap: 8px;
    flex-wrap: nowrap;
  }
  .logo {
    font-size: 20px;
    flex: 1;
    text-align: center;
    order: 2;
  }
  .hamburger-menu {
    display: inline-flex;
    order: 1;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .mobile-nav-buttons {
    display: flex;
    flex-wrap: wrap;
    background-color: var(--primary-dark);
  }
  .mobile-nav-buttons .btn {
    flex: 1;
    min-width: 160px;
    padding: 10px 16px;
    font-size: 13px;
  }
  .main-nav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100vh;
    height: 100dvh;
    z-index: 1001;
    background-color: #ffffff;
    box-shadow: 4px 0 20px rgba(0,0,0,0.2);
    transform: translateX(-100%);
    transition: transform 0.4s ease, opacity 0.3s ease;
    overflow-y: auto;
    padding-top: 70px;
    opacity: 0;
    visibility: hidden;
  }
  .main-nav.active {
    display: block;
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }
  .main-nav.active .nav-container, .main-nav.open .nav-container {
    display: block;
  }
  .nav-container {
    width: 100%;
    max-width: none;
    padding: 0;
    display: block;
  }
  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    padding: 8px 0;
  }
  .nav-menu a {
    padding: 14px 24px;
    border-bottom: 1px solid #eeeeee;
    font-size: 15px;
    text-align: left;
    position: relative;
    border-left: 3px solid transparent;
    width: 100%;
    box-sizing: border-box;
  }
  .nav-menu a:hover, .nav-menu a.active {
    background-color: #f9f9f9;
    color: var(--primary);
    border-bottom-color: #eeeeee;
    border-left-color: var(--primary);
    padding-left: 28px;
  }
  .mobile-menu-overlay.active, .mobile-menu-overlay.open {
    display: block;
    opacity: 1;
  }
  .footer-grid {
    flex-direction: column;
    gap: 32px;
  }
  .footer-info, .footer-links {
    min-width: 100%;
  }
  .footer-bottom {
    padding: 12px 16px;
  }
  body.no-scroll {
    overflow: hidden;
  }
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
    padding-left: 16px;
    padding-right: 16px;
  }
  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;
}