:root {
  --primary-color: #017439;
  --secondary-color: #FFFFFF;
  --register-color: #C30808;
  --login-color: #C30808;
  --bg-color: #FFFFFF;
  --btn-text-color: #FFFF00;
  --header-top-bg: #005029;
  --header-nav-bg: #017439;
  --header-offset: 120px;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  padding-top: var(--header-offset);
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
}
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  background-color: var(--header-top-bg);
}
.header-top {
  background-color: var(--header-top-bg);
  width: 100%;
}
.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
}
.logo {
  display: inline-block;
  color: var(--secondary-color);
  font-size: 32px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  line-height: 1;
}
.desktop-nav-buttons {
  display: flex;
  gap: 10px;
  align-items: center;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 700;
  border-radius: 4px;
  text-align: center;
  line-height: 1.2;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}
.btn-login {
  background-color: var(--login-color);
  color: var(--btn-text-color);
}
.btn-register {
  background-color: var(--register-color);
  color: var(--btn-text-color);
}
.btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}
.main-nav {
  background-color: var(--header-nav-bg);
  width: 100%;
  display: flex;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 0 20px;
  width: 100%;
}
.nav-link {
  display: inline-block;
  padding: 14px 16px;
  color: var(--secondary-color);
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: background-color 0.3s, color 0.3s;
  border-radius: 0;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 16px;
  right: 16px;
  height: 2px;
  background-color: var(--btn-text-color);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}
.nav-link:hover::after {
  transform: scaleX(1);
}
.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.15);
}
.mobile-nav-buttons {
  display: none;
}
.hamburger-menu {
  display: none;
}
.mobile-menu-overlay {
  display: none;
}
.site-footer {
  background-color: #1a1a1a;
  color: #ffffff;
  padding-top: 50px;
  margin-top: auto;
  border-top: 4px solid var(--primary-color);
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 0.9fr;
  gap: 40px;
  padding: 0 20px 30px;
}
.footer-column h4 {
  color: var(--primary-color);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-logo {
  font-size: 36px;
  font-weight: 800;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 2px;
  display: inline-block;
  margin-bottom: 15px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: #cccccc;
}
.footer-links ul {
  list-style: none;
}
.footer-links li {
  margin-bottom: 12px;
}
.footer-links a {
  color: #cccccc;
  font-size: 14px;
  transition: color 0.3s, padding-left 0.3s;
}
.footer-links a:hover {
  color: var(--primary-color);
  padding-left: 5px;
}
.footer-bottom {
  border-top: 1px solid #333333;
  padding: 20px 0;
  text-align: center;
  background-color: #0f0f0f;
  font-size: 14px;
  color: #aaaaaa;
}
@media (max-width: 768px) {
  :root {
    --header-offset: 156px;
  }
  body {
    overflow-x: hidden;
  }
  .header-top {
    background-color: var(--header-top-bg);
    width: 100%;
  }
  .header-container {
    width: 100%;
    max-width: none;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .logo {
    font-size: 26px;
    flex: 1;
    text-align: center;
    margin: 0;
    order: 2;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .hamburger-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    cursor: pointer;
    z-index: 1003;
    order: 1;
    flex: 0 0 auto;
  }
  .hamburger-menu span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--secondary-color);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
  }
  .hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }
  .hamburger-menu.active span:nth-child(2) {
    opacity: 0;
  }
  .hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }
  .header-spacer {
    width: 40px;
    flex: 0 0 auto;
    order: 3;
    visibility: hidden;
  }
  .main-nav {
    background-color: var(--header-nav-bg);
    display: none;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.4s ease;
    z-index: 1002;
    border-top: none;
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.3);
    padding-top: 60px;
    justify-content: flex-start;
  }
  .main-nav.active {
    display: flex;
    transform: translateX(0);
  }
  .nav-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 0;
    justify-content: flex-start;
  }
  .nav-link {
    display: block;
    width: 100%;
    padding: 15px 20px;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: left;
    color: var(--secondary-color);
  }
  .nav-link::after {
    display: none;
  }
  .nav-link:hover {
    background-color: rgba(0, 0, 0, 0.2);
  }
  .mobile-nav-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    background-color: var(--header-top-bg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
  }
  .mobile-nav-buttons .btn {
    flex: 1;
    max-width: 180px;
    font-size: 13px;
    padding: 10px 12px;
    text-align: center;
    white-space: nowrap;
  }
  .mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease;
  }
  .mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
  }
  .footer-container {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    width: 100%;
    max-width: none;
    padding: 0 15px 30px;
  }
  .site-footer {
    padding-top: 40px;
  }
  .footer-column:first-child {
    grid-column: 1 / -1;
  }
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  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;
}