html { scroll-behavior: smooth; }
body { margin: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: #333333; padding-top: var(--header-offset); overflow-x: hidden; }
:root { --header-offset: 122px; }

/* Shared Header Styles */
.site-header { position: fixed; top: 0; left: 0; right: 0; width: 100%; z-index: 1000; box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); }
.header-top { box-sizing: border-box; min-height: 68px; height: 68px; display: flex; align-items: center; overflow: hidden; background-color: #0F5E8C; width: 100%; }
.header-container { box-sizing: border-box; width: 100%; height: 100%; max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; }
.logo { font-size: 24px; font-weight: bold; color: #FFFFFF; text-decoration: none; display: block; }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.mobile-nav-buttons { box-sizing: border-box; display: none; min-height: 48px; background-color: #1A7FB5; width: 100%; max-width: 100%; overflow: hidden; }

.main-nav { box-sizing: border-box; min-height: 52px; height: 52px; display: flex; align-items: center; overflow: hidden; background-color: #26A9E0; width: 100%; }
.nav-container { box-sizing: border-box; height: 100%; max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 0 20px; }
.nav-list { list-style: none; padding: 0; margin: 0; display: flex; }
.nav-list li { margin: 0 15px; }
.nav-list a { text-decoration: none; color: #FFFFFF; font-weight: 500; font-size: 16px; transition: color 0.3s ease; }
.nav-list a:hover { color: #DDDDDD; }

/* Hamburger Menu */
.hamburger-menu { display: none; width: 30px; height: 24px; position: relative; cursor: pointer; flex-direction: column; justify-content: space-between; border: none; background: transparent; padding: 0; }
.hamburger-menu .bar { display: block; width: 100%; height: 3px; background-color: #FFFFFF; transition: all 0.3s ease; border-radius: 2px; }
.hamburger-menu.active .bar:nth-child(1) { transform: translateY(10px) rotate(45deg); }
.hamburger-menu.active .bar:nth-child(2) { opacity: 0; }
.hamburger-menu.active .bar:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }

/* Buttons */
.btn { display: inline-block; padding: 10px 20px; border-radius: 5px; text-decoration: none; font-weight: bold; transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease; white-space: nowrap; cursor: pointer; border: none; }
.btn-login { background-color: #EA7C07; color: #FFFFFF; }
.btn-login:hover { background-color: #C86A06; }
.btn-register { background-color: #FFFFFF; color: #26A9E0; border: 1px solid #26A9E0; }
.btn-register:hover { background-color: #F0F0F0; border-color: #1A7FB5; color: #1A7FB5; }

/* Overlay */
.overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); z-index: 999; }

/* Footer Styles */
.site-footer { background-color: #0F5E8C; color: #FFFFFF; padding: 40px 0; font-size: 15px; }
.footer-top-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.footer-col h3 { font-size: 18px; margin-bottom: 20px; color: #FFFFFF; }
.footer-about .footer-logo { font-size: 24px; font-weight: bold; color: #FFFFFF; text-decoration: none; display: block; margin-bottom: 15px; }
.footer-description { margin-bottom: 20px; color: #E0E0E0; overflow-wrap: break-word; word-wrap: break-word; }
.footer-col p { margin-bottom: 10px; color: #E0E0E0; }
.footer-nav { list-style: none; padding: 0; margin: 0; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav a { color: #E0E0E0; text-decoration: none; transition: color 0.3s ease; }
.footer-nav a:hover { color: #FFFFFF; }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, 0.1); margin-top: 30px; max-width: 1200px; margin-left: auto; margin-right: auto; padding: 20px; }
.footer-bottom p { margin: 0; color: #E0E0E0; }
.footer-slot-anchor-inner { min-height: 10px; }

/* Mobile Styles */
@media (max-width: 768px) {
    :root { --header-offset: 110px; }
    body { overflow-x: hidden; }
    .page-content img { max-width: 100% !important; height: auto !important; display: block; }
    .page-content { overflow-x: hidden; max-width: 100%; }

    .header-top { min-height: 60px !important; height: 60px !important; }
    .header-container { width: 100%; max-width: none; padding: 0 15px; position: relative; }
    .logo { flex: 1 !important; display: flex !important; justify-content: center !important; align-items: center !important; }
    .desktop-nav-buttons { display: none !important; }

    .mobile-nav-buttons {
        display: flex !important;
        min-height: 48px;
        align-items: center;
        justify-content: center;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        padding: 0 15px;
        overflow: hidden;
        gap: 10px;
        flex-wrap: nowrap;
    }
    .mobile-nav-buttons .btn {
        flex: 1;
        min-width: 0;
        max-width: calc(50% - 5px);
        box-sizing: border-box;
        padding: 8px 12px;
        font-size: 13px;
        white-space: normal;
        word-wrap: break-word;
        overflow-wrap: break-word;
        text-align: center;
    }

    .main-nav { min-height: 48px !important; height: 48px !important; display: none; position: fixed; top: var(--header-offset); left: 0; width: 280px; height: calc(100% - var(--header-offset)); background-color: #0F5E8C; flex-direction: column; padding: 20px; box-shadow: 2px 0 5px rgba(0,0,0,0.2); transform: translateX(-100%); transition: transform 0.3s ease; overflow-y: auto; z-index: 1001; }
    .main-nav.active { display: flex; transform: translateX(0); }
    .nav-container { width: 100%; max-width: none; padding: 0; height: auto; }
    .nav-list { flex-direction: column; width: 100%; }
    .nav-list li { margin: 10px 0; }
    .nav-list a { font-size: 18px; display: block; padding: 5px 0; }

    .hamburger-menu { display: flex; z-index: 2; position: absolute; left: 15px; top: 50%; transform: translateY(-50%); }

    .footer-top-grid { grid-template-columns: 1fr; padding: 0 15px; }
    .footer-col { margin-bottom: 30px; }
    .footer-col:last-child { margin-bottom: 0; }
    .footer-bottom { padding: 0 15px 20px; }
}
/* 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;
}