:root {
  --primary: #C61F1F;
  --secondary: #E53030;
  --deep-red: #7E0D0D;
  --dark-bg: #140C0C;
  --card-bg: #2A1212;
  --gold: #F3C54D;
  --border-color: #6A1E1E;
  --text-main: #FFF1E8;
  --btn-bg: linear-gradient(180deg, #FFB04A 0%, #D86A14 100%);
  --header-offset: 122px;
}
body {
  background-color: var(--dark-bg);
  color: var(--text-main);
  margin: 0;
  padding-top: var(--header-offset);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--deep-red);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
  min-height: auto;
}
.header-top {
  background-color: var(--deep-red);
  width: 100%;
  border-bottom: 2px solid var(--gold);
}
.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 30px;
}
.logo {
  font-size: 32px;
  font-weight: 800;
  color: var(--gold);
  text-decoration: none;
  letter-spacing: 1px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
  flex-shrink: 0;
}
.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-shrink: 0;
}
.btn {
  display: inline-block;
  padding: 10px 28px;
  border-radius: 30px;
  font-weight: 700;
  font-size: 14px;
  text-align: center;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(216, 106, 20, 0.4);
  color: #140C0C;
}
.btn-register, .btn-download {
  background: var(--btn-bg);
  color: #140C0C;
  border: 1px solid rgba(255, 176, 74, 0.7);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(243, 197, 77, 0.5);
}
.main-nav {
  background-color: #1A0E0E;
  width: 100%;
  display: flex;
  border-bottom: 2px solid var(--border-color);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 10px 20px;
  flex-wrap: wrap;
  gap: 0 10px;
}
.nav-link {
  color: var(--text-main);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  padding: 12px 18px;
  white-space: nowrap;
  transition: color 0.3s ease;
  border-radius: 4px;
}
.nav-link:hover {
  color: var(--gold);
  background-color: rgba(243, 197, 77, 0.08);
}
.mobile-nav-buttons {
  display: none;
}
.hamburger-menu {
  display: none;
}
.mobile-menu-overlay {
  display: none;
}
.site-footer {
  background: linear-gradient(180deg, #1A0E0E 0%, var(--deep-red) 100%);
  border-top: 3px solid var(--gold);
  color: var(--text-main);
  margin-top: 60px;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 30px;
  padding: 50px 30px 30px;
}
.footer-logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--gold);
  text-decoration: none;
}
.footer-brand p {
  margin-top: 15px;
  font-size: 14px;
  line-height: 1.6;
  opacity: 0.9;
}
.footer-col h4 {
  color: var(--gold);
  margin-bottom: 16px;
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
}
.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-nav a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
  opacity: 0.9;
}
.footer-nav a:hover {
  color: var(--gold);
  opacity: 1;
  text-decoration: underline;
}
.footer-note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--gold);
  font-weight: 600;
}
.footer-bottom {
  background-color: rgba(0, 0, 0, 0.5);
  border-top: 1px solid var(--border-color);
  padding: 18px 20px;
  text-align: center;
}
.footer-bottom p {
  margin: 0;
  font-size: 13px;
  opacity: 0.8;
}
@media (max-width: 768px) {
  :root {
    --header-offset: 146px;
  }
  .site-header {
    background-color: var(--deep-red);
  }
  .header-container {
    width: 100%;
    max-width: none;
    padding: 8px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
  }
  .logo {
    font-size: 24px;
    text-align: center;
    flex: 1;
    text-align: center;
    padding-right: 0;
  }
  .desktop-nav-buttons {
    display: none;
  }
  .hamburger-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    gap: 6px;
    order: 0;
  }
  .hamburger-menu span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--text-main);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .main-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 78%;
    max-width: 340px;
    height: 100vh;
    background-color: #1A0E0E;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding-top: 80px;
    padding-left: 25px;
    padding-right: 25px;
    transition: transform 0.3s ease-in-out;
    transform: translateX(-100%);
    z-index: 1002;
    overflow-y: auto;
    box-shadow: 3px 0 15px rgba(0, 0, 0, 0.5);
  }
  .main-nav.active {
    display: block;
    transform: translateX(0);
  }
  .nav-container {
    flex-direction: column;
    align-items: flex-start;
    padding: 0;
    gap: 0;
    width: 100%;
    max-width: none;
  }
  .nav-link {
    color: var(--text-main);
    font-size: 16px;
    padding: 14px 0;
    display: block;
    width: 100%;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
  }
  .nav-link:hover {
    color: var(--gold);
    background-color: transparent;
    padding-left: 10px;
  }
  .mobile-nav-buttons {
    display: flex;
    background-color: var(--deep-red);
    padding: 8px 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }
  .mobile-container {
    width: 100%;
    display: flex;
    gap: 10px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
  }
  .mobile-container .btn {
    flex: 1;
    min-width: 120px;
    padding: 10px 16px;
    font-size: 13px;
    text-align: center;
    justify-content: center;
  }
  .mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1001;
  }
  .mobile-menu-overlay.active {
    display: block;
  }
  .site-footer {
    margin-top: 40px;
  }
  .footer-container {
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 40px 20px 20px;
  }
  .footer-brand p {
    font-size: 13px;
  }
  .footer-bottom {
    padding: 15px;
  }
  .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;
}