:root { --header-offset: 122px; --primary-color: #26A9E0; --secondary-color: #FFFFFF; --header-bg-dark: #003366; --header-bg-light: #26A9E0; --btn-login-bg: #EA7C07; --btn-register-bg: #FFC107; --text-dark: #000000; --text-light: #FFFFFF; }

body { font-family: 'Arial', sans-serif; margin: 0; padding-top: var(--header-offset); background-color: var(--secondary-color); color: #333; overflow-x: hidden; }

.site-header { position: fixed; top: 0; left: 0; right: 0; width: 100%; z-index: 1000; box-shadow: 0 2px 5px rgba(0,0,0,0.2); background-color: var(--header-bg-dark); }

.header-top { box-sizing: border-box; min-height: 68px; height: 68px; display: flex; align-items: center; overflow: hidden; background-color: var(--header-bg-dark); 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 { font-size: 28px; font-weight: bold; color: var(--text-light); text-decoration: none; display: flex; align-items: center; 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(--header-bg-light); padding: 10px 20px; }

.btn { padding: 10px 18px; border-radius: 5px; text-decoration: none; font-weight: bold; text-align: center; white-space: nowrap; transition: background-color 0.3s ease, transform 0.2s ease; border: none; cursor: pointer; display: inline-block; }
.btn-register { background-color: var(--btn-register-bg); color: var(--text-dark); }
.btn-login { background-color: var(--btn-login-bg); color: var(--text-light); }
.btn:hover { transform: translateY(-1px); box-shadow: 0 2px 8px rgba(0,0,0,0.3); }

.main-nav { box-sizing: border-box; min-height: 52px; height: 52px; display: flex; align-items: center; overflow: hidden; background-color: var(--header-bg-light); width: 100%; transition: transform 0.3s ease; }
.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; gap: 25px; }
.nav-link { color: var(--text-dark); text-decoration: none; font-weight: bold; font-size: 16px; padding: 10px 0; transition: color 0.3s ease; white-space: nowrap; }
.nav-link:hover, .nav-link.active { color: var(--text-light); }

.hamburger-menu { display: none; width: 40px; height: 40px; cursor: pointer; flex-direction: column; justify-content: space-around; align-items: center; position: relative; z-index: 1001; }
.hamburger-menu span { display: block; width: 70%; height: 3px; background-color: var(--text-light); border-radius: 2px; 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); }

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

.site-footer { background-color: var(--header-bg-dark); color: var(--text-light); padding: 40px 20px 20px; font-size: 14px; }
.footer-top-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; max-width: 1200px; margin: 0 auto 30px; }
.footer-col h3 { color: var(--text-light); font-size: 18px; margin-bottom: 15px; }
.footer-col p, .footer-col ul { margin: 0; padding: 0; }
.footer-col ul li { list-style: none; margin-bottom: 8px; }
.footer-col ul li a { color: rgba(255,255,255,0.7); text-decoration: none; transition: color 0.3s ease; }
.footer-col ul li a:hover { color: var(--text-light); }
.footer-logo { font-size: 24px; font-weight: bold; color: var(--text-light); text-decoration: none; display: block; margin-bottom: 15px; }
.footer-description { color: rgba(255,255,255,0.7); line-height: 1.6; word-wrap: break-word; overflow-wrap: break-word; }
.footer-slot-anchor-inner { min-height: 20px; }
.footer-bottom { text-align: center; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; margin-top: 20px; color: rgba(255,255,255,0.6); }
.footer-bottom a { text-decoration: none; color: inherit; }

@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  .site-header { box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
  .header-top { min-height: 60px !important; height: 60px !important; padding: 0 15px; }
  .header-container { width: 100%; max-width: none; justify-content: space-between; padding: 0; }
  .logo { flex: 1 !important; display: flex !important; justify-content: center !important; align-items: center !important; font-size: 24px; }
  .logo img { max-height: 56px !important; width: auto; height: auto; display: block !important; }
  .mobile-spacer { width: 40px; visibility: hidden; display: block; }
  .desktop-nav-buttons { display: none !important; }
  .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-left: 15px; padding-right: 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
  }
  .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 {
    display: none; /* Default hidden */
    flex-direction: column;
    position: fixed;
    top: var(--header-offset);
    left: 0;
    width: 250px;
    height: calc(100vh - var(--header-offset));
    background-color: var(--header-bg-dark);
    transform: translateX(-100%);
    overflow-y: auto;
    z-index: 1000;
    padding: 20px 0;
  }
  .main-nav.active {
    display: flex; /* Must set display for visibility */
    transform: translateX(0);
  }
  .nav-container { flex-direction: column; align-items: flex-start; padding: 0 20px; gap: 15px; }
  .nav-link { color: var(--text-light); width: 100%; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .nav-link:last-child { border-bottom: none; }
  .hamburger-menu { display: flex; }
  .overlay.active { display: block; }

  .footer-top-grid { grid-template-columns: 1fr; gap: 20px; }
  .site-footer { padding: 30px 15px 15px; }
  .footer-col h3 { font-size: 16px; margin-bottom: 10px; }
  .footer-col ul 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;
  }
}