:root { --primary: #FF8C1A; --secondary: #FFA53A; --btn-bg: linear-gradient(180deg, #FFA53A 0%, #D96800 100%); --card-bg: #17191F; --body-bg: #0D0E12; --text-main: #FFF3E6; --border: #A84F0C; --glow: #FFB04D; --deep-orange: #D96800; --header-offset: 164px; --header-top-bg: #1a1c23; --main-nav-bg: #0D0E12; --footer-bg: #0D0E12; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(--body-bg); color: var(--text-main); padding-top: var(--header-offset); line-height: 1.5; }
a { color: var(--text-main); text-decoration: none; transition: color 0.3s; }
a:hover { color: var(--primary); }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; min-height: auto; background-color: var(--header-top-bg); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--border); }
.header-top { background-color: var(--header-top-bg); width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; min-height: 68px; }
.logo { display: inline-block; font-size: 28px; font-weight: 900; color: var(--text-main); text-transform: uppercase; letter-spacing: 2px; background: var(--btn-bg); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; text-shadow: 0 0 20px rgba(255, 140, 26, 0.3); line-height: 1; }
.logo:hover { color: var(--primary); -webkit-text-fill-color: var(--primary); }
.desktop-nav-buttons { display: flex; gap: 10px; align-items: center; }
.btn { display: inline-block; padding: 10px 24px; border-radius: 8px; font-weight: 700; font-size: 14px; border: none; cursor: pointer; transition: all 0.3s ease; text-decoration: none; line-height: 1.4; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3); opacity: 0.9; }
.btn-register { background-image: var(--btn-bg); color: var(--text-main); border: 1px solid var(--border); }
.btn-download { background-image: var(--btn-bg); color: var(--text-main); border: 1px solid var(--border); }
.main-nav { background-color: var(--main-nav-bg); border-top: 2px solid var(--border); border-bottom: 1px solid var(--border); display: flex; width: 100%; min-height: 52px; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: stretch; width: 100%; padding: 0 20px; }
.nav-menu { list-style: none; display: flex; flex-direction: row; justify-content: center; align-items: center; gap: 0; width: 100%; }
.nav-item { position: relative; }
.nav-item a { display: block; padding: 16px 14px; font-size: 15px; font-weight: 600; color: var(--text-main); border-bottom: 3px solid transparent; transition: border-color 0.3s, color 0.3s; text-decoration: none; white-space: nowrap; }
.nav-item a:hover, .nav-item a:focus { color: var(--primary); border-bottom-color: var(--primary); }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
.mobile-nav-buttons { display: none; }
body { padding-top: var(--header-offset); }
@media (max-width: 768px) {
  body { padding-top: 0; padding-top: var(--header-offset); }
  .mobile-nav-buttons ~ main, .mobile-nav-buttons ~ .page-content { padding-top: 0; }
  .site-header { background-color: var(--header-top-bg); }
  .header-container { min-height: 60px; width: 100%; max-width: none; padding: 0 15px; }
  .logo { font-size: 24px; }
  .desktop-nav-buttons { display: none; }
  .main-nav { position: fixed; top: 0; left: 0; width: 280px; max-width: 80%; height: 100vh; height: 100dvh; background-color: var(--header-top-bg); border-right: 1px solid var(--border); border-top: none; border-bottom: none; transform: translateX(-100%); transition: transform 0.3s ease; z-index: 1002; display: block; overflow-y: auto; }
  .nav-container { flex-direction: column; padding: 0; width: 100%; max-width: none; min-height: auto; }
  .nav-menu { flex-direction: column; justify-content: flex-start; align-items: stretch; padding: 60px 0 20px; }
  .nav-item a { padding: 15px 25px; font-size: 16px; border-bottom: 1px solid rgba(255, 255, 255, 0.08); border-left: 3px solid transparent; }
  .nav-item a:hover, .nav-item a:focus { border-left-color: var(--primary); }
  .main-nav.active { display: block; transform: translateX(0); }
  .main-nav.active .nav-menu { padding-top: 70px; }
  .hamburger-menu { display: inline-flex; flex-direction: column; justify-content: center; align-items: center; width: 30px; height: 30px; cursor: pointer; gap: 5px; z-index: 1001; }
  .hamburger-menu .bar { width: 25px; height: 3px; background-color: var(--primary); border-radius: 3px; transition: all 0.3s ease; display: block; }
  .hamburger-menu.active .bar:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); background-color: var(--primary); }
  .hamburger-menu.active .bar:nth-child(2) { opacity: 0; }
  .hamburger-menu.active .bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); background-color: var(--primary); }
  .mobile-menu-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.6); z-index: 1001; transition: opacity 0.3s ease; opacity: 0; }
  .mobile-menu-overlay.active { display: block; opacity: 1; }
  .mobile-header-top { display: flex; justify-content: space-between; align-items: center; width: 100%; }
  .mobile-nav-buttons { display: flex; position: relative; width: 100%; background-color: var(--header-top-bg); padding: 8px 15px; border-top: 1px solid rgba(168, 79, 12, 0.4); z-index: 999; }
  .mobile-buttons-container { display: flex; gap: 10px; justify-content: center; align-items: center; width: 100%; }
  .mobile-buttons-container .btn { flex: 1; text-align: center; padding: 10px 8px; font-size: 13px; width: auto; max-width: 200px; }
  :root { --header-offset: 164px; }
}
.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: var(--footer-bg); color: var(--text-main); padding: 0; border-top: 2px solid var(--border); }
.footer-content { max-width: 1200px; margin: 0 auto; padding: 30px 20px; }
.copyright { text-align: center; padding: 20px 0; font-size: 14px; opacity: 0.8; }
.footer-container { max-width: 1200px; margin: 0 auto; padding-top: 40px; padding-bottom: 20px; padding-left: 20px; padding-right: 20px; }
.footer-columns { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px; padding-bottom: 30px; }
.footer-col { flex: 1; min-width: 200px; }
.footer-title { font-size: 22px; font-weight: 800; color: var(--text-main); margin-bottom: 12px; text-transform: uppercase; }
.footer-desc { color: #ccc; font-size: 14px; line-height: 1.6; }
.footer-heading { font-size: 16px; font-weight: 700; color: var(--primary); margin-bottom: 12px; text-transform: uppercase; }
.footer-nav { list-style: none; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav a { color: #ccc; text-decoration: none; font-size: 14px; transition: color 0.3s; }
.footer-nav a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid rgba(168, 79, 12, 0.3); padding-top: 20px; text-align: center; }
.copyright { text-align: center; padding: 20px 0; font-size: 14px; opacity: 0.8; color: var(--text-main); }
.btn:focus, .nav-item a:focus, .nav-item a:active { outline: 2px solid var(--primary); outline-offset: 2px; }
@supports (padding-top: env(safe-area-inset-top)) {
  .site-header { padding-top: env(safe-area-inset-top); }
  .main-nav { padding-bottom: env(safe-area-inset-bottom); }
}
/* 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;
}