:root { --header-offset: 122px; }
body { padding-top: var(--header-offset); overflow-x: hidden; margin: 0; font-family: sans-serif; background-color: #F5F7FA; color: #333333; }
body.no-scroll { overflow: hidden; }

.site-header { position: fixed; top: 0; left: 0; right: 0; width: 100%; z-index: 1000; box-shadow: 0 2px 5px rgba(0,0,0,0.1); background-color: #FFFFFF; }

.header-top { box-sizing: border-box; min-height: 68px; height: 68px; display: flex; align-items: center; overflow: hidden; background-color: #E53935; width: 100%; }
.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; padding: 0 20px; }

.logo { font-family: 'Arial', sans-serif; font-size: 28px; font-weight: bold; color: #FFFFFF; text-decoration: none; display: flex; align-items: center; }
.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: #F5F7FA; border-bottom: 1px solid #E0E0E0; }

.btn { text-decoration: none; padding: 10px 20px; border-radius: 5px; font-weight: bold; color: #FFFFFF; text-align: center; white-space: nowrap; cursor: pointer; transition: all 0.3s ease; border: none; }
.btn-register { background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%); }
.btn-login { background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%); }
.btn:hover { opacity: 0.9; }

.main-nav { box-sizing: border-box; min-height: 52px; height: 52px; display: flex; align-items: center; overflow: hidden; background-color: #FF5A4F; 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; }
.main-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 20px; }
.main-nav ul li a { text-decoration: none; color: #FFFFFF; font-weight: bold; padding: 5px 0; transition: color 0.3s ease; white-space: nowrap; font-size: 15px; }
.main-nav ul li a:hover { color: rgba(255,255,255,0.8); }

.hamburger-menu { display: none; width: 30px; height: 24px; position: relative; cursor: pointer; flex-direction: column; justify-content: space-between; background: none; border: none; padding: 0; }
.hamburger-menu span { display: block; height: 3px; width: 100%; background: #FFFFFF; border-radius: 3px; transition: all 0.3s ease; }

.site-footer { background-color: #333333; color: #FFFFFF; padding: 40px 0; font-size: 14px; }
.footer-top-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 0 20px; }
.footer-col h3 { color: #FF5A4F; margin-bottom: 15px; font-size: 16px; }
.footer-col p { line-height: 1.6; color: rgba(255,255,255,0.8); word-wrap: break-word; overflow-wrap: break-word; }
.footer-logo { font-family: 'Arial', sans-serif; font-size: 24px; font-weight: bold; color: #FFFFFF; text-decoration: none; margin-bottom: 15px; display: block; }
.footer-nav { list-style: none; margin: 0; padding: 0; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav li a { text-decoration: none; color: rgba(255,255,255,0.8); transition: color 0.3s ease; white-space: nowrap; }
.footer-nav li a:hover { color: #FF5A4F; }
.footer-bottom { text-align: center; padding: 20px; border-top: 1px solid rgba(255,255,255,0.1); margin-top: 30px; color: rgba(255,255,255,0.6); }
.footer-bottom p { margin: 0; }
.footer-slot-anchor { min-height: 1px; width: 100%; display: block; }
.footer-slot-anchor-inner { min-height: 1px; width: 100%; display: block; }

.overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 998; display: none; transition: opacity 0.3s ease; opacity: 0; }
.overlay.active { display: block; opacity: 1; }

/* Mobile Styles */
@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  body { padding-top: var(--header-offset); }
  .page-content img { max-width: 100% !important; height: auto !important; display: block; }
  .page-content { overflow-x: hidden; max-width: 100%; }
  body { overflow-x: hidden; }

  .site-header { box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
  .header-top { min-height: 60px; height: 60px; padding: 0 15px; }
  .header-container { padding: 0; position: relative; justify-content: flex-start; }

  .hamburger-menu { display: flex; z-index: 1001; margin-right: 15px; }
  .hamburger-menu.active span:nth-child(1) { transform: translateY(10.5px) rotate(45deg); }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: translateY(-10.5px) rotate(-45deg); }

  .logo { position: absolute !important; left: 50% !important; transform: translateX(-50%) !important; display: flex !important; align-items: center !important; justify-content: center !important; max-width: calc(100% - 100px); /* Account for hamburger menu width */ }
  .logo img { max-height: 56px !important; }

  .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: 10px 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: #F5F7FA;
    border-bottom: 1px solid #E0E0E0;
  }
  .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;
    position: fixed;
    top: var(--header-offset);
    left: 0;
    width: 80%;
    max-width: 300px;
    height: calc(100% - var(--header-offset));
    background-color: #333333;
    flex-direction: column;
    padding: 20px 0;
    box-shadow: 2px 0 5px rgba(0,0,0,0.2);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1001;
    overflow-y: auto;
  }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { flex-direction: column; align-items: flex-start; padding: 0 15px; height: auto; }
  .main-nav ul { flex-direction: column; width: 100%; gap: 0; }
  .main-nav ul li { width: 100%; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .main-nav ul li:last-child { border-bottom: none; }
  .main-nav ul li a { padding: 15px 0; display: block; color: #FFFFFF; font-size: 16px; }

  .site-footer { padding: 30px 0; }
  .footer-top-grid { grid-template-columns: 1fr; padding: 0 15px; }
  .footer-col { margin-bottom: 20px; }
  .footer-col:last-child { margin-bottom: 0; }
  .footer-logo { margin-bottom: 10px; }
  .footer-bottom { padding: 15px; }
}
/* 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;
}