:root { --header-offset: 122px; --color-primary: #2F6BFF; --color-secondary: #6FA3FF; --color-button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); --color-card-bg: #FFFFFF; --color-background: #F4F7FB; --color-text-main: #1F2D3D; --color-border: #D6E2FF; --color-glow: #A5C4FF; }
body { padding-top: var(--header-offset); margin: 0; font-family: Arial, sans-serif; color: var(--color-text-main); background-color: var(--color-background); overflow-x: hidden; }

.site-header { position: fixed; top: 0; left: 0; right: 0; width: 100%; z-index: 1000; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1); background-color: var(--color-primary); box-sizing: border-box; }

.header-top { box-sizing: border-box; min-height: 68px; height: 68px; display: flex; align-items: center; overflow: hidden; background-color: var(--color-primary); width: 100%; padding: 0 20px; }
.header-container { box-sizing: border-box; width: 100%; height: 100%; max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }

.logo { color: var(--color-card-bg); font-size: 28px; font-weight: bold; text-decoration: none; display: block; white-space: nowrap; }
.logo img { display: block; max-height: 60px; height: auto; width: auto; max-width: 280px; object-fit: contain; }

.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.mobile-nav-buttons { box-sizing: border-box; display: none; min-height: 48px; background-color: var(--color-background); padding: 0 20px; }

.btn { padding: 10px 20px; border-radius: 25px; text-decoration: none; font-weight: bold; font-size: 15px; text-align: center; white-space: nowrap; transition: all 0.3s ease; border: none; cursor: pointer; color: var(--color-card-bg); }
.btn-register { background: var(--color-button-gradient); box-shadow: 0 4px 10px var(--color-glow); }
.btn-register:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 6px 12px var(--color-glow); }
.btn-login { background-color: var(--color-secondary); box-shadow: 0 4px 10px rgba(111, 163, 255, 0.4); }
.btn-login:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 6px 12px rgba(111, 163, 255, 0.6); }

.main-nav { box-sizing: border-box; min-height: 52px; height: 52px; display: flex; align-items: center; overflow: hidden; background-color: var(--color-secondary); width: 100%; }
.nav-container { box-sizing: border-box; height: 100%; max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 0 20px; }
.nav-link { color: var(--color-card-bg); text-decoration: none; padding: 10px 15px; font-size: 15px; font-weight: bold; transition: background-color 0.3s ease; white-space: nowrap; }
.nav-link:hover, .nav-link.active { background-color: rgba(255, 255, 255, 0.2); border-radius: 5px; }

.hamburger-menu { display: none; flex-direction: column; justify-content: space-around; width: 30px; height: 25px; cursor: pointer; padding: 5px; position: relative; z-index: 1002; }
.hamburger-menu span { display: block; height: 3px; background-color: var(--color-card-bg); border-radius: 3px; transition: all 0.3s ease-in-out; }
.hamburger-menu.active span:nth-child(1) { transform: translateY(11px) rotate(45deg); }
.hamburger-menu.active span:nth-child(2) { opacity: 0; }
.hamburger-menu.active span:nth-child(3) { transform: translateY(-11px) rotate(-45deg); }

.overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); z-index: 999; }
.overlay.active { display: block; }

.site-footer { background-color: var(--color-primary); color: var(--color-card-bg); padding: 40px 20px 20px; font-size: 14px; box-sizing: border-box; }
.footer-top-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 1200px; margin: 0 auto 30px auto; }
.footer-col h3 { color: var(--color-card-bg); font-size: 18px; margin-bottom: 15px; }
.footer-col p { line-height: 1.6; color: rgba(255, 255, 255, 0.8); word-wrap: break-word; overflow-wrap: break-word; }
.footer-logo { color: var(--color-card-bg); font-size: 24px; font-weight: bold; text-decoration: none; display: block; margin-bottom: 15px; }
.footer-nav { list-style: none; padding: 0; margin: 0; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav a { color: rgba(255, 255, 255, 0.8); text-decoration: none; transition: color 0.3s ease; }
.footer-nav a:hover { color: var(--color-card-bg); }
.footer-bottom { text-align: center; margin-top: 30px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, 0.2); color: rgba(255, 255, 255, 0.6); }
.footer-bottom a { color: inherit; text-decoration: none; }

.footer-slot-anchor-inner { min-height: 10px; }

@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  body { overflow-x: hidden; }

  .header-top { min-height: 60px !important; height: 60px !important; padding: 0 15px; }
  .header-container { width: 100%; max-width: none; justify-content: center; position: relative; }
  .logo { flex: 1 !important; display: flex !important; justify-content: center !important; align-items: center !important; }
  .logo img { max-height: 56px !important; max-width: 100%; height: auto; }
  .desktop-nav-buttons { display: none !important; }
  .hamburger-menu { display: flex; position: absolute; left: 0; top: 50%; transform: translateY(-50%); }

  .mobile-nav-buttons {
    display: flex !important;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    width: 100%; max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: var(--color-background);
  }
  .mobile-nav-buttons .btn {
    flex: 1; min-width: 0;
    max-width: calc(50% - 5px);
    box-sizing: border-box;
    padding: 8px 12px;
    font-size: 13px;
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  .main-nav {
    min-height: 48px !important; height: auto !important; 
    display: none; 
    flex-direction: column;
    position: fixed; 
    top: var(--header-offset); 
    left: 0;
    width: 80%; 
    max-width: 300px;
    height: calc(100% - var(--header-offset));
    background-color: var(--color-card-bg);
    z-index: 1001;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    padding: 20px 0; 
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    overflow-y: auto;
    align-items: flex-start;
  }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { flex-direction: column; width: 100%; max-width: none; padding: 0; }
  .nav-link { color: var(--color-text-main); width: 100%; padding: 12px 20px; text-align: left; border-bottom: 1px solid var(--color-border); }
  .nav-link:hover, .nav-link.active { background-color: var(--color-background); border-radius: 0; }
  .nav-link:last-child { border-bottom: none; }

  .footer-top-grid { grid-template-columns: 1fr; max-width: none; }
  .footer-col { margin-bottom: 20px; }
  .footer-col:last-child { margin-bottom: 0; }

  .page-content img { max-width: 100% !important; height: auto !important; display: block; }
  .page-content { overflow-x: hidden; max-width: 100%; }
}
/* 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;
  }
}