:root { --header-offset: 170px; --primary: #113B7A; --secondary: #1D5FD1; --card-bg: #10233F; --text-main: #F3F8FF; --text-secondary: #AFC4E8; --border-color: #244D84; --glow-color: #4FA8FF; --gold-color: #F2C14E; --divider-color: #1B3357; --deep-navy: #08162B; --btn-gradient: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%); }
body { padding-top: var(--header-offset); margin: 0; background-color: var(--deep-navy); color: var(--text-main); font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif; overflow-x: hidden; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45); background-color: var(--primary); }
.header-top { background: linear-gradient(135deg, #0a1e3f 0%, var(--primary) 50%, #0a1e3f 100%); padding: 0; }
.header-container { max-width: 1200px; margin: 0 auto; padding: 10px 30px; display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 32px; font-weight: 900; letter-spacing: 2px; background: linear-gradient(135deg, #fff 30%, #F2C14E 70%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; text-decoration: none; font-style: italic; text-shadow: 0 0 18px rgba(79, 168, 255, 0.65); }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.btn { display: inline-block; padding: 9px 18px; border-radius: 30px; background: var(--btn-gradient); color: #fff; text-decoration: none; font-size: 14px; font-weight: 600; transition: all 0.3s; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25); border: 1px solid rgba(255, 255, 255, 0.12); letter-spacing: 0.3px; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 17px rgba(79, 168, 255, 0.42); }
.btn-login { background: linear-gradient(180deg, #F2C14E 0%, #b98322 100%); color: #08162b; border: none; }
.btn-register { background: var(--btn-gradient); }
.btn-download { background: linear-gradient(180deg, #28b86b, #187a3e); border: none; }
.main-nav { background: var(--primary); border-top: 1px solid var(--divider-color); border-bottom: 1px solid #0a1e3f; display: flex; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; gap: 14px; padding: 6px 20px; }
.nav-link { color: var(--text-main); text-decoration: none; font-size: 14px; font-weight: 500; padding: 6px 13px; border-radius: 6px; transition: all 0.25s; position: relative; }
.nav-link::after { content: ""; position: absolute; bottom: 0; left: 8px; right: 8px; height: 2px; background: var(--gold-color); transform: scaleX(0); transition: transform 0.3s; border-radius: 2px; }
.nav-link:hover { color: var(--gold-color); }
.nav-link:hover::after { transform: scaleX(1); }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
.mobile-nav-buttons { display: none; }
.btn { text-decoration: none; }
@media (max-width: 768px) {
  :root { --header-offset: 148px; }
  body { padding-top: var(--header-offset); overflow-x: hidden; }
  .page-content img { max-width: 100% !important; height: auto !important; display: block; }
  .page-content { overflow-x: hidden; max-width: 100%; }
  body { overflow-x: hidden; }
  .header-container { width: 100%; max-width: none; padding: 8px 16px; min-height: 48px; flex-wrap: nowrap; }
  .header-top { flex-wrap: wrap; }
  .logo { order: 2; font-size: 25px; flex: 1; text-align: left; padding-left: 8px; }
  .desktop-nav-buttons { display: none; }
  .hamburger-menu { display: flex; order: 1; flex-direction: column; justify-content: space-between; width: 32px; height: 24px; cursor: pointer; padding: 0; background: transparent; border: none; z-index: 1002; }
  .hamburger-menu span { width: 100%; height: 3px; background: #fff; border-radius: 3px; transition: all 0.3s ease; transform-origin: left; }
  .hamburger-menu.active span:nth-child(1) { transform: rotate(45deg) translate(1px, -1px); background: var(--gold-color); }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: rotate(-45deg) translate(2px, 2px); background: var(--gold-color); }
  .mobile-nav-buttons { display: flex !important; gap: 8px; justify-content: center; padding: 9px 12px; background: var(--primary); border-top: 1px solid rgba(255, 255, 255, 0.05); flex-wrap: wrap; width: 100%; position: relative; z-index: 1000; }
  .mobile-nav-buttons .btn { display: inline-flex; flex: 1 1 auto; justify-content: center; padding: 8px 5px; font-size: 11px; color: #fff; }
  .main-nav { display: none; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; width: 85%; max-width: 320px; background: #0d1f3a; transform: translateX(-100%); transition: transform 0.3s ease; z-index: 1002; overflow-y: auto; border-right: 1px solid rgba(255, 255, 255, 0.08); box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3); padding-top: 15px; border-top: none; }
  .main-nav.active { display: block; transform: translateX(0); }
  .nav-container { flex-direction: column; align-items: flex-start; gap: 0; width: 100%; padding: 0; min-height: auto; }
  .nav-link { width: 100%; padding: 14px 22px; border-bottom: 1px solid rgba(255, 255, 255, 0.04); font-size: 15px; box-sizing: border-box; }
  .nav-link::after { display: none; }
  .nav-link:hover { background: rgba(45, 107, 255, 0.15); }
  .mobile-menu-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.55); z-index: 998; display: none; }
  .mobile-menu-overlay.active { display: block; }
  .site-header { position: fixed; }
}
/* 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;
}