:root {
  --primary-color: #26A9E0;
  --secondary-color: #FFFFFF;
  --login-color: #EA7C07;
  --text-color: #000000;
  --header-offset: 122px;
}
body {
  margin: 0;
  padding-top: var(--header-offset);
  font-family: Arial, Helvetica, sans-serif;
  background-color: #FFFFFF;
}
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
  border-bottom: 3px solid var(--primary-color);
}
.header-top {
  background-color: var(--primary-color);
  width: 100%;
}
.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 30px;
  min-height: 48px;
}
.logo {
  font-family: Georgia, serif;
  font-size: 30px;
  font-weight: bold;
  color: var(--secondary-color);
  text-decoration: none;
  text-shadow: 3px 3px 6px rgba(0,0,0,0.4);
  letter-spacing: 1px;
}
.logo:hover {
  color: #ffdd00;
}
.desktop-nav-buttons {
  display: flex;
  gap: 10px;
  align-items: center;
}
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 25px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 3px 10px rgba(0,0,0,0.2);
  border: 2px solid rgba(255,255,255,0.6);
}
.btn-login {
  background-color: var(--login-color);
  color: var(--secondary-color);
}
.btn-login:hover {
  background-color: #c96606;
  transform: scale(1.03);
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
.btn-register {
  background-color: #3CB371;
  color: var(--secondary-color);
}
.btn-register:hover {
  background-color: #2E8B57;
  transform: scale(1.03);
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
.main-nav {
  display: flex;
  flex-direction: row;
  background-color: #1a3a5c;
  width: 100%;
  position: static;
  transition: transform 0.3s ease;
  border-top: 2px solid #ffdd00;
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  padding: 0 20px;
  width: 100%;
}
.nav-link {
  display: inline-block;
  padding: 14px 18px;
  color: var(--secondary-color);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.nav-link:hover {
  background-color: var(--primary-color);
  color: #ffdd00;
}
.hamburger-menu {
  display: none;
}
.mobile-menu-overlay {
  display: none;
}
.mobile-nav-buttons {
  display: none;
}
.site-footer {
  background-color: #1a3a5c;
  color: var(--secondary-color);
  width: 100%;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px;
  padding: 40px 20px 20px;
}
.footer-column {
  flex: 1;
  min-width: 200px;
}
.footer-brand .footer-logo {
  font-size: 30px;
  font-weight: 800;
  color: var(--secondary-color);
  text-decoration: none;
  letter-spacing: 1px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}
.footer-brand .footer-logo:hover {
  color: #ffdd00;
}
.footer-description {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  margin-top: 10px;
  line-height: 1.6;
}
.footer-heading {
  font-size: 18px;
  margin-bottom: 15px;
  color: #ffdd00;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 8px;
  display: inline-block;
}
.footer-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-nav li {
  margin-bottom: 10px;
}
.footer-nav li a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.3s ease;
}
.footer-nav li a:hover {
  color: var(--primary-color);
  padding-left: 6px;
}
.footer-bottom {
  background-color: #0e2439;
  text-align: center;
  padding: 15px 0;
  border-top: 2px solid var(--primary-color);
}
.footer-bottom p {
  margin: 0;
  font-size: 14px;
  color: rgba(255,255,255,0.9);
}
@media (max-width: 768px) {
  :root {
    --header-offset: 110px;
  }
  .header-top {
    display: flex;
  }
  .header-container {
    width: 100%;
    max-width: none;
    min-height: 44px;
    padding: 8px 15px;
    position: relative;
  }
  .logo {
    font-size: 22px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .hamburger-menu {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
    position: relative;
    left: 0;
  }
  .hamburger-bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--secondary-color);
    border-radius: 2px;
    transition: all 0.3s ease;
  }
  .hamburger-menu.active .hamburger-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .hamburger-menu.active .hamburger-bar:nth-child(2) {
    opacity: 0;
  }
  .hamburger-menu.active .hamburger-bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
  .main-nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    background-color: #1a3a5c;
    z-index: 1000;
    box-shadow: 3px 0 15px rgba(0,0,0,0.3);
  }
  .nav-container {
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: 10px 0;
    margin: 0;
    width: 250px;
  }
  .nav-link {
    padding: 15px 25px;
    font-size: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .nav-link:hover {
    background-color: var(--primary-color);
  }
  .main-nav.active {
    display: block;
    transform: translateX(0);
  }
  .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: 999;
  }
  .mobile-menu-overlay.active {
    display: block;
  }
  .mobile-nav-buttons {
    display: flex;
    width: 200px;
    padding: 6px 15px;
    gap: 8px;
    width: auto;
    background-color: var(--primary-color);
    justify-content: center;
  }
  .mobile-nav-buttons .btn {
    padding: 6px 14px;
    font-size: 12px;
  }
  .footer-container {
    flex-direction: column;
    gap: 25px;
    padding: 30px 20px 10px;
  }
  .footer-column {
    min-width: 100%;
    text-align: center;
  }
  .footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
  .footer-nav li {
    margin-bottom: 5px;
  }
  .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;
}