:root {
  --primary-color: #017439;
  --secondary-color: #FFFFFF;
  --header-offset: 122px;
  --header-top-bg: #003d1c;
  --nav-bg: #017439;
  --btn-register-bg: #C30808;
  --btn-login-bg: #C30808;
  --btn-font-color: #FFFF00;
  --font-main: 'Arial', sans-serif;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: var(--font-main);
  padding-top: var(--header-offset);
}
/* ===== Header Styles ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  min-height: auto;
  background-color: var(--secondary-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  z-index: 1000;
}
.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-left: 20px;
  padding-right: 20px;
  min-height: 68px;
}
.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--secondary-color);
  text-decoration: none;
  display: block;
  letter-spacing: 1px;
}
.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  font-size: 15px;
  transition: opacity 0.3s ease, transform 0.2s ease;
  text-align: center;
  border: none;
}
.btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}
.btn-register {
  background-color: var(--btn-register-bg);
  color: var(--btn-font-color);
}
.btn-login {
  background-color: var(--btn-login-bg);
  color: var(--btn-font-color);
}
.main-nav {
  background-color: var(--nav-bg);
  width: 100%;
  display: flex;
  flex-direction: row;
  position: static;
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 10px 20px;
  gap: 20px;
  flex-wrap: wrap;
}
.nav-link {
  color: var(--secondary-color);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 5px 0;
  transition: text-shadow 0.2s ease;
  white-space: nowrap;
}
.nav-link:hover {
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}
.mobile-nav-buttons {
  display: none;
}
.hamburger-menu {
  display: none;
}
.mobile-menu-overlay {
  display: none;
}
/* ===== Footer Styles ===== */
.site-footer {
  background-color: var(--header-top-bg);
  color: var(--secondary-color);
  padding: 40px 20px 20px;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 30px;
}
.footer-column {
  flex: 1;
  min-width: 200px;
}
.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--secondary-color);
  text-decoration: none;
}
.footer-description {
  margin-top: 15px;
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.8;
  max-width: 300px;
}
.footer-heading {
  font-size: 18px;
  margin-bottom: 15px;
  color: var(--secondary-color);
}
.footer-links {
  list-style: none;
  padding: 0;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  color: var(--secondary-color);
  text-decoration: none;
  font-size: 14px;
  opacity: 0.8;
  transition: opacity 0.3s ease, padding-left 0.3s ease;
}
.footer-links a:hover {
  opacity: 1;
  padding-left: 5px;
}
.footer-bottom {
  text-align: center;
  padding-top: 20px;
  margin-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}
.copyright {
  font-size: 14px;
  opacity: 0.7;
}
/* ===== Mobile Responsive ===== */
@media (max-width: 768px) {
  :root {
    --header-offset: 110px;
  }
  .site-header {
    min-height: auto;
  }
  .header-top {
    min-height: 60px;
  }
  .header-container {
    width: 100%;
    max-width: none;
    padding-left: 15px;
    padding-right: 15px;
    min-height: 60px;
  }
  .logo {
    font-size: 24px;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .mobile-nav-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 8px 15px;
    background-color: var(--header-top-bg);
    min-height: 48px;
    align-items: center;
  }
  .mobile-nav-buttons .btn {
    flex: 1;
    max-width: 150px;
    padding: 8px 12px;
    font-size: 14px;
  }
  .main-nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100vh;
    background-color: var(--nav-bg);
    z-index: 1002;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    padding-top: 60px;
  }
  .main-nav.active {
    display: flex;
    transform: translateX(0);
  }
  .nav-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 20px;
    gap: 15px;
  }
  .nav-link {
    font-size: 16px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
  }
  .hamburger-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 1003;
    padding: 5px;
  }
  .hamburger-menu .bar {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--secondary-color);
    transition: all 0.3s ease;
    border-radius: 3px;
  }
  .hamburger-menu.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .hamburger-menu.active .bar:nth-child(2) {
    opacity: 0;
  }
  .hamburger-menu.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  .mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1001;
  }
  .mobile-menu-overlay.active {
    display: block;
  }
  .footer-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .footer-description {
    max-width: 100%;
  }
}
/* ===== Mobile Content Protection ===== */
@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;
  }
}
/* 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;
}