/* === CSS Reset & Base === */
.site-header, .site-header *, .site-footer, .site-footer * { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #26A9E0;
  --primary-dark: #1A7FA8;
  --primary-light: #E6F5FC;
  --secondary: #FFFFFF;
  --accent: #EA7C07;
  --text-dark: #1A1A2E;
  --text-light: #FFFFFF;
  --header-offset: 122px;
}
body { padding-top: var(--header-offset); margin: 0; font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; background: #FFFFFF; }
/* === Header === */
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15); min-height: auto; }
.header-top { background-color: var(--primary); width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 12px 24px; min-height: 56px; }
.logo { font-size: 28px; font-weight: 800; color: var(--text-light); text-decoration: none; text-transform: lowercase; letter-spacing: 1px; line-height: 1.2; white-space: nowrap; display: inline-block; text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2); }
.logo:hover { color: #FFD700; }
.desktop-nav-buttons { display: flex; gap: 10px; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 6px; font-size: 14px; font-weight: 600; text-decoration: none; transition: all 0.3s ease; border: none; cursor: pointer; white-space: nowrap; }
.btn-login { background-color: var(--accent); color: var(--text-light); box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); }
.btn-login:hover { background-color: #C96A05; transform: translateY(-1px); }
.btn-register { background-color: #FFD700; color: #1A1A2E; box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); }
.btn-register:hover { background-color: #FFC107; transform: translateY(-1px); }
.main-nav { background-color: var(--secondary); width: 100%; display: flex; flex-direction: row; border-top: 2px solid var(--primary); }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: flex-start; align-items: center; padding: 0 24px; width: 100%; overflow-x: auto; scrollbar-width: none; }
.nav-container::-webkit-scrollbar { display: none; }
.nav-link { color: var(--text-dark); text-decoration: none; font-size: 14px; font-weight: 500; padding: 15px 12px; transition: color 0.3s, background-color 0.3s; border-bottom: 3px solid transparent; white-space: nowrap; display: block; }
.nav-link:hover, .nav-link.active { color: var(--primary); border-bottom-color: var(--primary); background-color: var(--primary-light); }
.hamburger-menu { display: none; background: transparent; border: none; cursor: pointer; z-index: 1001; flex-direction: column; justify-content: center; gap: 6px; width: 44px; height: 44px; padding: 10px; }
.hamburger-line { display: block; width: 24px; height: 2px; background-color: var(--text-dark); transition: all 0.3s ease; border-radius: 2px; margin: 0 auto; }
.hamburger-menu.active .hamburger-line:nth-child(1) { transform: translateY(8px) rotate(45deg); background-color: var(--primary); }
.hamburger-menu.active .hamburger-line:nth-child(2) { opacity: 0; }
.hamburger-menu.active .hamburger-line:nth-child(3) { transform: translateY(-8px) rotate(-45deg); 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, 0.5); z-index: 999; opacity: 0; transition: opacity 0.3s ease; }
.mobile-menu-overlay.active { opacity: 1; }
.mobile-nav-buttons { display: none; background-color: var(--primary); padding: 8px 16px; justify-content: center; gap: 12px; }
/* === Footer === */
.site-footer { background-color: #1A1A2E; color: #B0B0C0; width: 100%; padding: 50px 0 0; margin-top: 50px; }
.footer-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.footer-row { display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; padding-bottom: 30px; }
.footer-col { flex: 1 1 200px; min-width: 160px; }
.footer-about { flex: 2 1 300px; }
.footer-logo { font-size: 24px; font-weight: 800; color: var(--primary); text-decoration: none; display: block; margin-bottom: 15px; }
.footer-desc { font-size: 14px; line-height: 1.8; margin-bottom: 15px; color: #B0B0C0; }
.footer-buttons { display: flex; flex-direction: column; gap: 10px; max-width: 180px; }
.footer-btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 6px; font-size: 14px; font-weight: 600; text-decoration: none; transition: all 0.3s; }
.footer-btn-login { background-color: var(--accent); color: #FFFFFF; }
.footer-btn-login:hover { background-color: #C96A05; }
.footer-btn-register { background-color: #FFD700; color: #1A1A2E; }
.footer-btn-register:hover { background-color: #FFC107; }
.footer-heading { color: #FFFFFF; font-size: 16px; margin-bottom: 18px; font-weight: 600; border-bottom: 2px solid var(--primary); display: inline-block; padding-bottom: 5px; }
.footer-link { display: block; padding: 5px 0; color: #B0B0C0; text-decoration: none; font-size: 14px; transition: color 0.3s, padding-left 0.3s; }
.footer-link:hover { color: var(--primary); padding-left: 5px; }
.footer-contact-line { font-size: 14px; margin-bottom: 8px; }
.footer-support-btn { display: inline-block; margin-top: 10px; padding: 8px 16px; background-color: var(--primary); color: #FFFFFF; border-radius: 6px; text-decoration: none; font-size: 13px; font-weight: 600; transition: background-color 0.3s; }
.footer-support-btn:hover { background-color: var(--primary-dark); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 18px 0; text-align: center; }
.footer-copyright { font-size: 14px; color: #B0B0C0; margin-bottom: 5px; }
.footer-disclaimer { font-size: 13px; color: #888; }
/* === Mobile Styles === */
@media (max-width: 768px) {
  :root { --header-offset: 160px; }
  .header-top { background-color: var(--primary); }
  .header-container { width: 100%; max-width: none; padding: 10px 15px; min-height: 50px; flex-wrap: wrap; }
  .logo { font-size: 24px; flex: 1; text-align: center; order: 2; }
  .desktop-nav-buttons { display: none; }
  .hamburger-menu { display: flex; order: 1; }
  .mobile-nav-buttons { display: flex; width: 100%; order: 3; }
  .main-nav { display: none; position: fixed; top: 0; left: 0; width: 280px; height: 100vh; background-color: #FFFFFF; flex-direction: column; transform: translateX(-100%); transition: transform 0.3s ease; z-index: 1000; box-shadow: 2px 0 15px rgba(0, 0, 0, 0.2); border-top: 2px solid var(--primary); }
  .main-nav.active { display: block; transform: translateX(0); }
  .nav-container { width: 100%; max-width: none; display: block; padding: 70px 20px 20px; overflow-y: auto; }
  .nav-link { display: block; padding: 14px 10px; border-bottom: 1px solid #E0E0E0; border-bottom-color: #E0E0E0; font-size: 15px; }
  .nav-link:hover, .nav-link.active { background-color: var(--primary-light); color: var(--primary); border-left: 3px solid var(--primary); border-bottom-color: #E0E0E0; }
  .mobile-menu-overlay { display: block; }
  .mobile-menu-overlay.active { display: block; }
  .mobile-nav-buttons .btn { flex: 1; padding: 10px 12px; font-size: 13px; max-width: 200px; }
  .footer-container { padding: 0 16px; }
  .footer-row { flex-direction: column; gap: 25px; }
  .footer-col { flex: 1 1 100%; }
  .footer-buttons { flex-direction: row; max-width: none; }
  .footer-bottom { padding: 15px 0; }
  .footer-copyright { font-size: 13px; }
  .page-content img { max-width: 100% !important; height: auto !important; display: block; }
  .page-content { overflow-x: hidden; max-width: 100%; }
  body { overflow-x: hidden; }
  .mobile-nav-buttons .btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 6px; font-size: 14px; font-weight: 600; text-decoration: none; transition: all 0.3s ease; border: none; cursor: pointer; white-space: nowrap; }
  .mobile-nav-buttons .btn-login { background-color: var(--accent); color: var(--text-light); box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); }
  .mobile-nav-buttons .btn-login:hover { background-color: #C96A05; }
  .mobile-nav-buttons .btn-register { background-color: #FFD700; color: #1A1A2E; box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); }
  .mobile-nav-buttons .btn-register:hover { background-color: #FFC107; }
}
/* 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;
}