:root{--header-offset:122px;--primary:#113B7A;--secondary:#1D5FD1;--btn-gradient:linear-gradient(180deg,#2B73F6 0%,#1144A6 100%);--card-bg:#10233F;--text-main:#F3F8FF;--text-secondary:#AFC4E8;--border:#244D84;--glow:#4FA8FF;--gold:#F2C14E;--divider:#1B3357;--deep-navy:#08162B}.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;box-shadow:0 4px 20px rgba(0,0,0,.5);border-bottom:1px solid var(--divider);font-family:'Segoe UI',Tahoma,Arial,sans-serif}.header-top{background:linear-gradient(135deg,#08162B 0%,#113B7A 100%);width:100%;min-height:68px;display:flex;align-items:center}.header-container{max-width:1200px;margin:0 auto;width:100%;padding-left:30px;padding-right:30px;display:flex;justify-content:space-between;align-items:center;min-height:68px;box-sizing:border-box}.logo{display:block;font-size:1.8rem;font-weight:800;color:#F3F8FF;text-decoration:none;letter-spacing:1px;text-shadow:0 0 10px rgba(74,168,255,.3);line-height:1.4}.logo:hover{color:var(--gold)}.desktop-nav-buttons{display:flex;align-items:center;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:8px 24px;border-radius:8px;font-size:.95rem;font-weight:700;text-decoration:none;transition:all .3s ease;cursor:pointer;border:none;letter-spacing:.3px;white-space:nowrap}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.3)}.btn-register{background:linear-gradient(180deg,#2B73F6 0%,#1144A6 100%);color:#fff;border:1px solid var(--glow)}.btn-register:hover{background:linear-gradient(180deg,#3b83f6 0%,#1e54b6 100%);box-shadow:0 0 15px rgba(74,168,255,.4)}.btn-login{background:var(--gold);color:#08162B;border:1px solid var(--gold)}.btn-login:hover{background:#f8d15e;box-shadow:0 0 15px rgba(242,193,78,.3)}.main-nav{background:var(--deep-navy);border-top:1px solid var(--divider);width:100%;display:flex;min-height:52px;align-items:center}.nav-container{max-width:1200px;margin:0 auto;width:100%;display:flex;flex-direction:row;justify-content:center;align-items:center;padding:8px 20px;gap:4px;box-sizing:border-box}.nav-link{color:var(--text-main);text-decoration:none;padding:8px 16px;border-radius:6px;font-size:1rem;font-weight:500;transition:all .25s ease;display:inline-block;white-space:nowrap;border:1px solid transparent}.nav-link:hover{color:var(--gold);background:rgba(74,168,255,.08);border-color:var(--border)}.nav-link.active{color:var(--gold);background:rgba(74,168,255,.1);border-color:var(--glow)}.mobile-nav-buttons,.hamburger-menu,.mobile-menu-overlay{display:none}body{padding-top:var(--header-offset)}@media(max-width:768px){:root{--header-offset:146px}.site-header{box-shadow:0 2px 10px rgba(0,0,0,.5)}.header-top{min-height:60px}.header-container{width:100%;max-width:none;padding-left:15px;padding-right:15px;min-height:60px;justify-content:center;position:relative}.logo{display:block;font-size:1.5rem;order:2;text-align:center;flex:0 0 auto}.desktop-nav-buttons{display:none}.mobile-nav-buttons{display:flex;justify-content:center;gap:10px;width:100%;padding:6px 10px 8px;background:linear-gradient(135deg,#08162B 0%,#113B7A 100%);border-top:1px solid var(--divider);z-index:1000;box-sizing:border-box}.mobile-nav-buttons .btn{flex:0 1 auto;min-height:36px;padding:6px 16px;font-size:.85rem}.hamburger-menu{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;position:absolute;left:15px;top:50%;transform:translateY(-50%);z-index:1001;cursor:pointer;background:transparent;border:1px solid var(--border);border-radius:8px;padding:6px}.hamburger-menu span{display:block;width:22px;height:2px;background:#F3F8FF;transition:all .3s ease;border-radius:2px}.hamburger-menu.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}.hamburger-menu.active span:nth-child(2){opacity:0}.hamburger-menu.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.main-nav{display:none;position:fixed;left:0;top:0;height:100vh;width:280px;background:linear-gradient(180deg,#113B7A 0%,#08162B 100%);flex-direction:column;align-items:flex-start;justify-content:flex-start;padding-top:90px;padding-left:0;padding-right:0;border-right:2px solid var(--gold);box-shadow:4px 0 20px rgba(0,0,0,.6);transition:transform .3s ease;z-index:1000;overflow-y:auto}.main-nav.active{display:flex;transform:translateX(0)}.nav-container{flex-direction:column;width:100%;padding:8px 0;align-items:flex-start;justify-content:flex-start}.nav-link{width:100%;padding:12px 25px;color:#F3F8FF;font-size:1rem;border-bottom:1px solid rgba(36,77,132,.3);border-radius:0;border-left:3px solid transparent;text-align:left;box-sizing:border-box}.nav-link:hover{background:rgba(74,168,255,.1);border-left-color:var(--gold);color:#F3F8FF}.mobile-menu-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(8,22,43,.7);z-index:999;backdrop-filter:none}.mobile-menu-overlay.active{display:block}body.no-scroll{overflow:hidden}.page-content img{max-width:100%!important;height:auto!important;display:block}.page-content{overflow-x:hidden;max-width:100%}.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;
}