/* General Reset & Base Styles */
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"; /* Modern sans-serif stack */
  line-height: 1.6;
  color: var(--text-main-color);
  background-color: var(--background-color);
  padding-top: var(--header-offset); /* Crucial for fixed header */
  overflow-x: hidden; /* Prevent horizontal scroll on mobile */
}

a {
  color: var(--text-main-color);
  text-decoration: none;
}

a:hover {
  color: var(--primary-color);
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.no-scroll {
  overflow: hidden;
}

:root {
  --primary-color: #F2C14E;
  --secondary-color: #FFD36B;
  --button-gradient: linear-gradient(180deg, #FFD86A 0%, #DDA11D 100%);
  --card-bg: #111111;
  --background-color: #0A0A0A;
  --text-main-color: #FFF6D6;
  --border-color: #3A2A12;
  --glow-color: #FFD36B;
  --header-top-bg: #1A1A1A; /* Distinct from main-nav */
  --main-nav-bg: #2A2A2A; /* Distinct from header-top */
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) + buffer */
}

/* Header Styles */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--background-color); /* Fallback or unifying background */
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
  box-sizing: border-box;
}

.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--header-top-bg);
  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 30px;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  display: block;
  line-height: 1;
  white-space: nowrap;
}

.logo img {
  display: block;
  max-height: 60px;
  height: auto;
  width: auto;
  max-width: 280px;
  object-fit: contain;
}

.desktop-nav-buttons {
  display: flex; /* Visible on desktop */
  gap: 12px;
  align-items: center;
}

.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden on desktop */
  min-height: 48px;
  background-color: var(--header-top-bg);
  padding: 10px 30px;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
}

.btn {
  padding: 10px 20px;
  border-radius: 5px;
  background: var(--button-gradient);
  color: #000; /* High contrast with gold gradient */
  font-weight: bold;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  display: inline-block;
  text-align: center;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--secondary-color);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
  color: #000;
}

.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Visible on desktop */
  align-items: center;
  overflow: hidden;
  background-color: var(--main-nav-bg);
  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-link {
  padding: 10px 15px;
  font-weight: bold;
  white-space: nowrap;
  transition: color 0.3s ease;
  color: var(--text-main-color);
}

.nav-link:hover {
  color: var(--primary-color);
}

.hamburger-menu {
  display: none; /* Hidden on desktop */
  width: 30px;
  height: 24px;
  position: relative;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  z-index: 1001;
}

.hamburger-menu span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--text-main-color);
  margin-bottom: 5px;
  transition: all 0.3s ease;
  border-radius: 2px;
}

.hamburger-menu span:last-child {
  margin-bottom: 0;
}

.hamburger-menu.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.overlay {
  display: none; /* Hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 999;
}

/* Footer Styles */
.site-footer {
  background-color: var(--card-bg);
  color: var(--text-main-color);
  padding: 40px 20px 20px;
  font-size: 14px;
  line-height: 1.8;
  box-sizing: border-box;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto 30px;
}

.footer-col {
  padding: 0 10px;
}

.footer-col-title {
  color: var(--primary-color);
  font-size: 16px;
  margin-bottom: 15px;
}

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 15px;
  display: inline-block;
}

.footer-description {
  color: #bbb;
  margin-bottom: 15px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.footer-nav li {
  margin-bottom: 8px;
}

.footer-nav a {
  color: #bbb;
  transition: color 0.3s ease;
}

.footer-nav a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  color: #888;
}

.footer-bottom p {
  margin: 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  :root {
    --header-offset: 110px; /* Mobile: 60px (header-top) + 48px (mobile-nav-buttons) + buffer */
  }

  body {
    overflow-x: hidden;
  }

  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }

  .site-header {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
  }

  .header-top {
    min-height: 60px;
    height: 60px;
    padding: 0 15px; /* Adjust padding for mobile */
  }

  .header-container {
    padding: 0;
    justify-content: space-between;
  }

  .hamburger-menu {
    display: block; /* Visible on mobile */
    order: -1;
  }

  .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    font-size: 20px;
    color: var(--primary-color);
  }
  
  .logo img {
    max-height: 56px !important; /* Max height for logo image on mobile */
  }

  .desktop-nav-buttons {
    display: none !important; /* Hidden on mobile */
  }

  .mobile-nav-buttons {
    display: flex !important; /* Visible on mobile */
    min-height: 48px;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 10px 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: var(--header-top-bg);
  }

  .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;
  }

  .main-nav {
    display: none; /* Hidden by default on mobile */
    flex-direction: column;
    position: fixed;
    top: var(--header-offset); /* Position below fixed header */
    left: 0;
    width: 280px;
    height: calc(100% - var(--header-offset));
    background-color: var(--main-nav-bg);
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.5);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
    box-sizing: border-box;
    padding: 20px 0;
  }

  .main-nav.active {
    display: flex; /* Show when active */
    transform: translateX(0);
  }

  .nav-container {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    max-width: none;
    padding: 0 20px;
    height: auto;
  }

  .nav-link {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .overlay.active {
    display: block;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-col {
    padding: 0;
  }
}
/* 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;
  }
}