:root {
  --primary: #113B7A;
  --secondary: #1D5FD1;
  --button-gradient: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
  --card-bg: #10233F;
  --text-main: #F3F8FF;
  --text-secondary: #AFC4E8;
  --border: #244D84;
  --glow: #4FA8FF;
  --gold: #F2C14E;
  --divider: #1B3357;
  --deep-navy: #08162B;
  --header-offset: 122px;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--deep-navy);
  color: var(--text-main);
  padding-top: var(--header-offset);
}
a {
  text-decoration: none;
  color: inherit;
}
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  width: 100%;
  background: transparent;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6), 0 0 1px rgba(79, 168, 255, 0.2);
}
.header-top {
  background: #0d2c5b;
  width: 100%;
}
.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  min-height: 68px;
}
.logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--gold);
  letter-spacing: 1px;
  text-transform: uppercase;
  text-shadow: 0 0 12px rgba(242, 193, 78, 0.4);
  display: inline-block;
  flex-shrink: 0;
}
.logo:hover {
  color: #f8d876;
  text-shadow: 0 0 16px rgba(242, 193, 78, 0.7);
}
.desktop-nav-buttons {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-shrink: 0;
}
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
  text-align: center;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  color: #ffffff;
}
.btn-register {
  background: var(--gold);
  color: var(--deep-navy);
}
.btn-register:hover {
  background: #f8d876;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(242, 193, 78, 0.4);
}
.btn-login {
  background: var(--button-gradient);
  color: #fff;
}
.btn-login:hover {
  background: linear-gradient(180deg, #3a83ff 0%, #1d55c0 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(45, 115, 246, 0.4);
}
.main-nav {
  background: #0b1d3c;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: block;
  width: 100%;
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: 2px;
  padding: 0 20px;
  min-height: 52px;
}
.nav-link {
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 4px;
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.nav-link:hover {
  color: var(--gold);
  background: rgba(242, 193, 78, 0.08);
  text-shadow: 0 0 8px rgba(242, 193, 78, 0.4);
}
.mobile-nav-buttons {
  display: none;
}
.hamburger-menu {
  display: none;
  width: 44px;
  height: 44px;
  position: absolute;
  top: 12px;
  left: 12px;
  cursor: pointer;
  background: transparent;
  border: none;
  z-index: 1001;
  padding: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
}
.hamburger-menu span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gold);
  border-radius: 1px;
  transition: all 0.3s ease;
}
.hamburger-menu.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}
.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(4, 10, 20, 0.8);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.mobile-menu-overlay.active {
  display: block;
  opacity: 1;
}
.site-footer {
  background: #08162b;
  border-top: 2px solid var(--border);
  padding: 0;
  margin-top: 60px;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px;
  padding: 40px 24px 30px;
}
.footer-column {
  flex: 1;
  min-width: 200px;
}
.footer-logo {
  font-size: 26px;
  font-weight: 800;
  color: var(--gold);
  display: block;
  margin-bottom: 14px;
}
.footer-column p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}
.footer-column h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--divider);
  position: relative;
}
.footer-column h3::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--gold);
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-nav a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-nav a:hover {
  color: var(--gold);
  padding-left: 6px;
}
.footer-contact p {
  margin-bottom: 8px;
}
.footer-bottom {
  border-top: 1px solid var(--divider);
  text-align: center;
  padding: 18px 20px;
  font-size: 13px;
  color: var(--text-secondary);
}
.footer-bottom p {
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width: 768px) {
  :root {
    --header-offset: 110px;
  }
  body {
    padding-top: var(--header-offset);
  }
  .header-container {
    width: 100%;
    max-width: none;
    padding: 0 10px;
    min-height: 60px;
  }
  .header-top {
    background: #0d2c5b;
  }
  .logo {
    font-size: 24px;
    margin-left: auto;
    margin-right: auto;
    display: block;
    line-height: 60px;
    text-align: center;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .mobile-nav-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 6px 10px;
    background: #0d2c5b;
    border-top: 1px solid rgba(36, 77, 132, 0.5);
    z-index: 1000;
  }
  .mobile-nav-buttons .btn {
    flex: 1;
    max-width: 180px;
    padding: 8px 12px;
    font-size: 13px;
  }
  .main-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 85%;
    background: #0b1d3c;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    z-index: 999;
    border-right: 1px solid var(--border);
  }
  .main-nav.active {
    display: block;
    transform: translateX(0);
  }
  .nav-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 16px;
    min-height: auto;
  }
  .nav-link {
    width: 100%;
    padding: 12px 10px;
    font-size: 15px;
    border-bottom: 1px solid rgba(36, 77, 132, 0.3);
  }
  .hamburger-menu {
    display: flex;
  }
  .mobile-menu-overlay.active {
    display: block;
  }
  .footer-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    gap: 24px;
    padding: 30px 16px 20px;
  }
  .footer-column {
    min-width: 100%;
  }
  .footer-bottom {
    padding: 14px 10px;
    font-size: 12px;
  }
  .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;
}