:root{--primary-color:#E53935;--secondary-color:#FF5A4F;--bg-color:#F5F7FA;--card-bg:#FFFFFF;--text-main:#333333;--border-color:#E0E0E0;--header-offset:122px;--header-top-bg:#C62828;--main-nav-bg:#FFFFFF;--button-gradient:linear-gradient(180deg,#FF5A4F 0%,#E53935 100%);--footer-bg:#1F2937;--footer-text:#E5E7EB;font-size:16px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI',Roboto,Arial,sans-serif;line-height:1.6;color:var(--text-main);background-color:var(--bg-color);padding-top:var(--header-offset)}#site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background-color:var(--header-top-bg);box-shadow:0 4px 12px rgba(0,0,0,.25);border-bottom:3px solid var(--secondary-color)}.header-top{background-color:var(--header-top-bg);width:100%;min-height:68px}.header-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:0 24px;min-height:68px}.logo{font-size:1.8rem;font-weight:800;color:#FFFFFF;text-decoration:none;letter-spacing:1px;text-shadow:2px 2px 4px rgba(0,0,0,.3);display:inline-block;line-height:1.2}.logo:hover{color:#FFD54F}.header-actions{display:flex;align-items:center;gap:12px}.desktop-nav-buttons{display:flex;gap:10px}.hamburger-menu{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px;z-index:1002}.hamburger-menu .bar{display:block;width:26px;height:3px;background:#FFFFFF;border-radius:3px;transition:transform .3s ease,opacity .3s ease}.mobile-nav-buttons{display:none}.main-nav{background-color:var(--main-nav-bg);width:100%;display:flex;min-height:52px;border-top:1px solid rgba(0,0,0,.05)}.nav-container{max-width:1200px;margin:0 auto;display:flex;flex-direction:row;justify-content:center;align-items:center;padding:0 16px;width:100%}.nav-menu{display:flex;flex-direction:row;justify-content:center;align-items:center;list-style:none;gap:4px;flex-wrap:wrap}.nav-menu a{display:block;padding:10px 14px;color:var(--text-main);text-decoration:none;font-weight:600;font-size:.9rem;border-radius:6px;transition:background-color .3s,color .3s;white-space:nowrap}.nav-menu a:hover{background-color:#FEE2E2;color:var(--primary-color)}.mobile-menu-overlay{display:none}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:8px;text-decoration:none;font-weight:700;font-size:.9rem;cursor:pointer;transition:transform .2s,box-shadow .2s;text-align:center;text-transform:uppercase;letter-spacing:.5px;min-height:44px}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(229,57,53,.4)}.btn-register{background:var(--button-gradient);color:#FFFFFF;border:1px solid #C62828;box-shadow:0 4px 12px rgba(229,57,53,.3)}.btn-login{background-color:#FFFFFF;color:var(--primary-color);border:2px solid var(--primary-color)}.btn-login:hover{background-color:#FEE2E2}.site-footer{background-color:var(--footer-bg);color:var(--footer-text);padding:48px 0 0;margin-top:64px;box-shadow:0 -4px 12px rgba(0,0,0,.1)}.footer-container{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding:0 24px 32px}.footer-column{line-height:2}.footer-brand .footer-logo{font-size:1.6rem;font-weight:800;color:#FFFFFF;text-decoration:none;display:inline-block;margin-bottom:12px}.footer-desc{font-size:.85rem;color:#D1D5DB}.footer-title{color:#FFFFFF;font-size:1rem;font-weight:700;margin-bottom:12px;text-transform:uppercase;letter-spacing:1px;position:relative;padding-bottom:6px}.footer-title::after{content:'';position:absolute;left:0;bottom:0;width:30px;height:2px;background:var(--secondary-color)}.footer-nav{display:flex;flex-direction:column;gap:6px}.footer-nav a{color:#D1D5DB;text-decoration:none;font-size:.88rem;transition:color .3s,padding-left .3s;padding:2px 0}.footer-nav a:hover{color:#FFFFFF;padding-left:6px}.footer-bottom{text-align:center;padding:16px 24px;background-color:#111827;color:#9CA3AF;font-size:.8rem;border-top:1px solid #374151}.footer-bottom p{margin:0}.page-content{max-width:1200px;margin:0 auto;padding:10px 24px 40px;min-height:60vh}.page-content img{max-width:100%;height:auto}.page-{padding-top:10px}.hidden-desktop{display:none}@media (max-width:768px){:root{--header-offset:110px}.header-top{min-height:60px}.header-container{width:100%;max-width:none;padding:0 15px;min-height:60px;justify-content:space-between;flex-wrap:nowrap}.logo{font-size:1.5rem;flex:0 0 auto;order:2}.header-actions{order:1}.desktop-nav-buttons{display:none}.hamburger-menu{display:flex;order:1}.mobile-nav-buttons{display:flex;gap:8px;padding:8px 12px;width:100%;background-color:var(--header-top-bg);justify-content:center;align-items:center;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.15)}.mobile-nav-buttons .btn{padding:10px 16px;font-size:.8rem}.main-nav{display:none;position:fixed;top:0;left:0;width:270px;height:100%;background-color:var(--card-bg);flex-direction:column;transform:translateX(-100%);transition:transform .35s ease-in-out;z-index:1005;box-shadow:2px 0 20px rgba(0,0,0,.2);overflow-y:auto}.main-nav.active{display:block;transform:translateX(0)}.nav-container,.nav-container .nav-menu{display:block}.nav-menu{padding:20px 0}.nav-menu a{padding:14px 16px;border-bottom:1px solid var(--border-color);border-radius:0;color:var(--text-main);text-align:left;font-size:1rem}.nav-menu a:hover{background-color:#FEE2E2}.main-nav{transition:transform .35s ease-in-out}.hamburger-menu.active .bar:nth-child(1){transform:translateY(8px) rotate(45deg)}.hamburger-menu.active .bar:nth-child(2){opacity:0}.hamburger-menu.active .bar:nth-child(3){transform:translateY(-8px) rotate(-45deg)}.mobile-menu-overlay.active{display:block}.mobile-menu-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.6);z-index:999}.site-footer .footer-container{grid-template-columns:1fr 1fr;gap:24px}.footer-brand span{display:none}.page-content{padding:10px 12px 30px}.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-top{width:100%}.header-container .logo{order:2}.header-container .hamburger-menu{order:1;margin-left:0}.header-container .header-actions{order:3}.hidden-mobile{display:none}}
/* 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;
}