:root { --header-offset: 122px; --primary: #E53935; --secondary: #FF5A4F; --primary-dark: #c62828; --primary-light: #ffebee; --btn-gradient: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%); --text-main: #333333; --bg-light: #F5F7FA; --card-bg: #FFFFFF; --border-color: #E0E0E0; --shadow-sm: 0 2px 8px rgba(0,0,0,0.12); --shadow-md: 0 4px 16px rgba(0,0,0,0.16); --shadow-lg: 0 8px 32px rgba(0,0,0,0.2); }
body { padding-top: var(--header-offset); margin: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, Arial, sans-serif; background: var(--bg-light); color: var(--text-main); overflow-x: hidden; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: #ffffff; box-shadow: 0 4px 20px rgba(229, 57, 53, 0.15); border-bottom: 2px solid var(--secondary); }
.site-header { min-height: auto; }
.header-top { background: linear-gradient(135deg, #c62828 0%, #E53935 100%); width: 100%; border-bottom: 1px solid rgba(255,255,255,0.1); }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 10px 24px; min-height: 48px; gap: 16px; }
.logo { font-size: 28px; font-weight: 800; color: #ffffff; text-decoration: none; letter-spacing: -0.5px; white-space: nowrap; display: inline-block; text-shadow: 0 2px 8px rgba(0,0,0,0.25); line-height: 1.2; position: relative; }
.logo::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 100%; height: 2px; background: var(--secondary); opacity: 0.6; }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; flex-shrink: 0; }
.btn { display: inline-block; padding: 10px 24px; font-size: 15px; font-weight: 600; border-radius: 50px; background: var(--btn-gradient); color: #ffffff; text-decoration: none; border: none; cursor: pointer; transition: all 0.3s ease; text-align: center; min-width: 100px; box-shadow: 0 4px 12px rgba(229, 57, 53, 0.3); letter-spacing: 0.3px; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(229, 57, 53, 0.4); color: #fff; }
.btn-login { background: #ffffff; color: var(--primary); border: 2px solid var(--primary); box-shadow: none; }
.btn-login:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-dark); }
.main-nav { background: #ffffff; width: 100%; display: flex; flex-direction: row; position: relative; border-top: 1px solid var(--border-color); transition: none; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 6px 20px; gap: 4px; width: 100%; }
.nav-link { display: inline-block; padding: 10px 10px; color: var(--text-main); text-decoration: none; font-size: 14px; font-weight: 600; line-height: 1.4; white-space: nowrap; border-bottom: 3px solid transparent; transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease; border-radius: 6px 6px 0 0; }
.nav-link:hover { color: var(--primary); border-bottom-color: var(--primary); background: var(--primary-light); }
.nav-link:active, .nav-link.current { color: var(--primary); border-bottom-color: var(--primary); background: var(--primary-light); }
.mobile-nav-buttons { display: none; }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
body.no-scroll { overflow: hidden; }
.site-footer { background: #1a1a2e; color: rgba(255,255,255,0.9); font-size: 14px; line-height: 1.7; }
.footer-container { max-width: 1200px; margin: 0 auto; padding: 48px 24px 24px; display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 32px; }
.footer-logo { font-size: 26px; font-weight: 800; color: #ffffff; text-decoration: none; display: inline-block; margin-bottom: 12px; flex-shrink: 0; }
.footer-desc { color: rgba(255,255,255,0.7); margin: 12px 0 16px; max-width: 340px; }
.footer-certifications { display: flex; gap: 10px; flex-wrap: wrap; }
.cert-badge { display: inline-block; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.2); border-radius: 20px; padding: 6px 14px; font-size: 13px; color: #fff; }
.footer-title { color: #ffffff; font-size: 16px; font-weight: 700; margin-bottom: 18px; position: relative; padding-bottom: 8px; }
.footer-title::after { content: ''; position: absolute; left: 0; bottom: 0; width: 32px; height: 3px; background: var(--secondary); border-radius: 2px; }
.footer-nav { list-style: none; padding: 0; margin: 0; width: 100%; text-align: left; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav a { color: rgba(255,255,255,0.7); text-decoration: none; transition: color 0.3s ease, padding-left 0.3s ease; display: inline-block; border-bottom: 1px solid transparent; }
.footer-nav a:hover { color: #ffffff; border-bottom-color: var(--secondary); }
.contact-info { list-style: none; padding: 0; margin: 0; width: 100%; text-align: left; }
.contact-info li { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; color: rgba(255,255,255,0.8); }
.contact-icon { font-size: 18px; flex-shrink: 0; }
.footer-bottom { background: #12121f; border-top: 1px solid rgba(255,255,255,0.05); padding: 16px 0; }
.footer-bottom-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; justify-content: space-between; gap: 8px; padding: 0 24px; text-align: center; }
.copyright { color: rgba(255,255,255,0.7); margin: 0; font-size: 14px; }
.copyright-year { font-weight: 600; color: #fff; }
.footer-note { color: rgba(255,255,255,0.5); margin: 0; font-size: 13px; }
.page-content { max-width: 1200px; margin: 0 auto; padding: 20px; }
@media (max-width: 768px) { body { padding-top: var(--header-offset); }
  :root { --header-offset: 110px; }
  .site-header { box-shadow: 0 4px 20px rgba(229, 57, 53, 0.2); }
  .header-top { background: linear-gradient(135deg, #c62828 0%, #E53935 100%); }
  .header-container { max-width: none; width: 100%; padding: 8px 12px; min-height: 52px; justify-content: space-between; gap: 8px; position: relative; }
  .logo { font-size: 22px; position: absolute; left: 50%; transform: translateX(-50%); white-space: nowrap; color: #ffffff; text-shadow: 0 2px 6px rgba(0,0,0,0.3); }
  .desktop-nav-buttons { display: none; }
  .hamburger-menu { display: flex; flex-direction: column; width: 32px; height: 32px; justify-content: center; gap: 6px; cursor: pointer; z-index: 1002; position: relative; background: transparent; border: none; padding: 6px; flex-shrink: 0; margin-left: 4px; }
  .hamburger-menu span { display: block; width: 26px; height: 3px; background: #ffffff; border-radius: 3px; transition: all 0.3s ease; margin: 0 auto; }
  .hamburger-menu.active span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }
  .mobile-nav-buttons { display: flex; justify-content: center; gap: 10px; padding: 8px 12px; background: linear-gradient(135deg, #c62828 0%, #E53935 100%); border-bottom: 1px solid rgba(255,255,255,0.2); position: relative; z-index: 999; min-height: 48px; align-items: center; flex-wrap: nowrap; }
  .mobile-nav-buttons .btn { min-width: 90px; padding: 8px 14px; font-size: 13px; display: inline-block; width: auto; flex: 0 0 auto; }
  .mobile-nav-buttons .btn-login { background: #ffffff; color: var(--primary); border: 1px solid #ffffff; }
  .main-nav { flex-direction: column; position: fixed; top: 0; left: 0; width: 84%; max-width: 340px; height: 100vh; height: 100dvh; background: #ffffff; z-index: 1001; overflow-y: auto; display: none; transform: translateX(-100%); transition: transform 0.3s ease, box-shadow 0.3s ease; box-shadow: none; padding-top: 0; align-items: stretch; unicode-bidi: isolate;
    inset-block-start: 0;
    inset-inline-start: 0;
    inset-block-end: 0;
  }
  .main-nav::before { content: ''; padding-top: 76px; display: block; }
  .main-nav .nav-container { flex-direction: column; width: 100%; max-width: none; padding: 0; gap: 0; display: flex; margin: 0; }
  .nav-link { display: block; padding: 14px 20px; font-size: 15px; text-align: left; border-bottom: 1px solid var(--border-color); border-radius: 0; width: 100%; box-sizing: border-box; }
  .nav-link:hover { background: var(--primary-light); color: var(--primary); padding-left: 20px; }
  .nav-link::before { content: '►'; color: var(--primary); margin-right: 10px; font-size: 12px; opacity: 0.7; }
  .main-nav.active { display: block; transform: translateX(0); box-shadow: 8px 0 32px rgba(0,0,0,0.25); }
  .mobile-menu-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.65); z-index: 998; display: none; backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px); }
  .mobile-menu-overlay.active { display: block; }
  .footer-container { grid-template-columns: 1fr 1fr; gap: 24px; padding: 32px 16px 16px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom-container { flex-direction: column; gap: 12px; padding: 0 16px; }
  .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;
}