:root { --header-offset: 122px; --primary: #FF8C1A; --secondary: #FFA53A; --bg-dark: #0D0E12; --card-bg: #17191F; --text-main: #FFF3E6; --border-color: #A84F0C; --deep-orange: #D96800; --glow: #FFB04D; }
body { padding-top: var(--header-offset); font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(--bg-dark); color: var(--text-main); margin: 0; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background-color: var(--bg-dark); box-shadow: 0 4px 20px rgba(0,0,0,0.6); border-bottom: 3px solid var(--deep-orange); }
.header-top { background-color: #1a1c24; width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 8px 30px; min-height: 52px; }
.logo { color: var(--text-main); font-size: 28px; font-weight: 900; text-decoration: none; text-transform: uppercase; display: inline-block; line-height: 1.2; font-style: italic; text-shadow: 0 0 10px rgba(255, 140, 26, 0.5); }
.logo::first-letter { color: var(--primary); }
.header-actions { display: flex; gap: 12px; align-items: center; }
.btn { display: inline-block; padding: 10px 24px; border-radius: 30px; text-decoration: none; font-weight: 700; font-size: 14px; border: none; cursor: pointer; transition: all 0.3s ease; }
.btn-download { background: linear-gradient(180deg, #FFA53A 0%, #D96800 100%); color: #fff; border: 1px solid var(--border-color); }
.btn-register { background: linear-gradient(180deg, #FFA53A 0%, #D96800 100%); color: #fff; border: 1px solid var(--border-color); }
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(255, 140, 26, 0.4); }
.main-nav { background-color: #0D0E12; width: 100%; display: flex; align-items: center; border-top: 1px solid rgba(255, 140, 26, 0.2); }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 0 20px; gap: 0; min-height: 44px; flex-wrap: nowrap; overflow-x: auto; }
.nav-link { color: var(--text-main); font-size: 15px; text-decoration: none; display: inline-block; padding: 12px 14px; white-space: nowrap; border-bottom: 3px solid transparent; transition: color 0.3s; }
.nav-link:hover { color: var(--primary); }
.nav-link.active { color: var(--primary); border-bottom-color: var(--primary); }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
.mobile-nav-buttons { display: none; }
@media (max-width: 768px) { :root { --header-offset: 110px; }
  .header-container { width: 100%; max-width: none; padding-left: 15px; padding-right: 15px; }
  .header-top { padding: 0; }
  .logo { font-size: 24px; }
  .header-top .header-container { display: flex; flex-wrap: wrap; position: relative; }
  .logo { order: 2; }
  .header-actions { order: 3; }
  .hamburger-menu { display: block; order: 1; }
  .header-top .header-actions { display: none; }
  .main-nav { display: none; flex-direction: column; position: fixed; top: 0; left: 0; width: 280px; height: 100%; background-color: var(--card-bg); z-index: 1002; transform: translateX(-100%); transition: transform 0.3s ease; border-right: 2px solid var(--deep-orange); overflow-y: auto; }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { width: 100%; max-width: none; display: flex; flex-direction: column; align-items: flex-start; padding: 60px 20px 20px; gap: 0; }
  .nav-link { width: 100%; padding: 14px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
  .hamburger-menu { position: absolute; top: 15px; left: 15px; width: 40px; height: 40px; display: flex; flex-direction: column; justify-content: space-around; align-items: center; cursor: pointer; z-index: 1001; }
  .hamburger-menu span { display: block; width: 28px; height: 3px; background-color: var(--text-main); transition: transform 0.4s, opacity 0.4s; border-radius: 2px; }
  .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-menu-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.7); z-index: 999; }
  .mobile-menu-overlay.active { display: block; }
  .mobile-nav-buttons { display: flex; position: fixed; top: 60px; left: 0; width: 100%; z-index: 995; background-color: #1a1c24; justify-content: center; gap: 10px; padding: 8px 15px; min-height: 48px; align-items: center; border-bottom: 1px solid var(--deep-orange); }
  .mobile-nav-buttons .btn { flex: 1; text-align: center; padding: 8px 12px; font-size: 13px; display: block; }
  .site-header { box-shadow: 0 2px 10px rgba(0,0,0,0.5); }
  .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-footer { background-color: #0D0E12; color: var(--text-main); padding: 50px 20px 0; border-top: 4px solid var(--primary); }
.footer-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 30px; padding-bottom: 30px; }
.footer-column { flex: 1; min-width: 250px; margin-bottom: 20px; }
.footer-brand { flex: 1.5; }
.footer-logo { color: #fff; font-size: 28px; font-weight: 900; text-decoration: none; text-transform: uppercase; font-style: italic; text-shadow: 0 0 10px rgba(255, 140, 26, 0.5); display: inline-block; margin-bottom: 15px; }
.footer-description { font-size: 14px; color: rgba(255, 243, 230, 0.8); line-height: 1.6; }
.footer-title { color: var(--primary); font-size: 18px; font-weight: 700;
    margin-bottom: 20px; text-transform: uppercase; }
.footer-nav { list-style: none; padding: 0; margin: 0; }
.footer-column.footer-links ul li { margin-bottom: 12px; }
.footer-nav li a { color: rgba(255, 243, 230, 0.8); font-size: 14px; text-decoration: none; transition: color 0.3s, padding-left 0.3s; }
.footer-nav li a:hover { color: var(--primary); padding-left: 8px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0; text-align: center; }
.footer-bottom p { font-size: 14px; color: rgba(255, 243, 230, 0.6); }
@media (max-width: 768px) { .footer-container { flex-direction: column; gap: 20px; }
  .footer-column { min-width: 100%; }
  .footer-bottom { text-align: center; } }
/* 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;
}