:root {
  --primary-color: #c62828;    /* 朱砂红 */
  --secondary-color: #fdd835;  /* 帝王黄 */
  --accent-color: #2e7d32;     /* 青瓷绿 */
  --dark-color: #3e2723;       /* 墨黑 */
  --paper-bg: #fff9e6;         /* 宣纸色 */
  --pattern-color: rgba(198, 40, 40, 0.1);
  --web-max-width: 960px;
}
* {margin: 0;padding: 0;box-sizing: border-box;}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--paper-bg);
  line-height: 1.6;
}

.header {
  background: linear-gradient(135deg, var(--dark-color) 0%, #4a3729 100%);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  max-width: var(--web-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--paper-bg);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo::before {
  content: "☯";
  margin-right: 8px;
  font-size: 48px;
  font-weight: 300;
  animation: rotate 20s linear infinite;
}
@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.logo:hover {
  color: var(--secondary-color);
  transition: color 0.3s ease;
}

/* Nav Menu */
.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 20px 16px;
  color: var(--paper-bg);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--secondary-color);
  border-bottom-color: var(--secondary-color);
}

/* Dropdown Indicators */
.nav-link.has-dropdown::after {
  content: "▼";
  font-size: 10px;
  margin-left: 6px;
  opacity: 0.7;
  transition: transform 0.3s ease;
}

.nav-item:hover .nav-link.has-dropdown::after {
  transform: rotate(180deg);
}

/* ===== Dropdown Menus ===== */
.dropdown {
  position: absolute;
  top: calc(100% - 8px);
  right: 0;
  background: #ffffca;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  min-width: 200px;
  z-index: 1001;
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Two-column Layout */
.dropdown.two-column {
  min-width: 400px;
}

.dropdown-content {
  padding: 16px 0;
}

.dropdown-section {
  display: flex;
}

.dropdown-column {
  flex: 1;
  padding: 0 20px;
}

.dropdown-column + .dropdown-column {
  border-left: 1px solid rgba(0, 0, 0, 0.1);
}

.dropdown-title {
  font-weight: 600;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding-top: 3px;
  border-bottom: 1px solid var(--pattern-color);
}

.dropdown-item {
  display: block;
  padding: 8px 0;
  color: var(--dark-color);
  text-decoration: none;
  transition: all 0.2s ease;
  border-radius: 4px;
}

.dropdown-item:hover {
  color: var(--primary-color);
  background-color: var(--pattern-color);
  padding-left: 8px;
}

.dropdown-item small {
  display: block;
  color: #666;
  font-size: 0.8rem;
  margin-top: 2px;
}

/* ===== Mobile Styles ===== */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--paper-bg);
  font-size: 20px;
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 768px) {
  .nav-container {padding: 0 16px;height: 56px;}
  .logo {font-size: 18px;}
  .nav-menu {position: fixed;top: 56px;left: 0;right: 0;background: var(--dark-color);flex-direction: column;padding: 20px 0;
    transform: translateY(-100%);opacity: 0;visibility: hidden;transition: all 0.3s ease;box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);}
  .nav-menu.active {transform: translateY(0);opacity: 1;visibility: visible;}
  .nav-item {width: 100%;}
  .nav-link {padding: 16px 20px;border-bottom: 1px solid rgba(255, 255, 255, 0.1);}
  .mobile-menu-toggle {display: block;}
  .dropdown {
    position: static;opacity: 1;visibility: visible;transform: none;box-shadow: none;border: none;background: rgba(0, 0, 0, 0.1);
    margin: 0 20px;border-radius: 4px;max-height: 0;overflow: hidden;transition: max-height 0.3s ease;}
  .nav-item:hover .dropdown {max-height: 400px;}
  .dropdown.two-column {min-width: auto;}
  .dropdown-section {flex-direction: column;}
  .dropdown-column + .dropdown-column {border-left: none;border-top: 1px solid rgba(255, 255, 255, 0.1);margin-top: 16px;padding-top: 16px;}
  .dropdown-item {color: var(--paper-bg);padding: 8px 12px;}
  .dropdown-item:hover {background-color: rgba(255, 255, 255, 0.1);color: var(--secondary-color);}
  .dropdown-title {color: var(--secondary-color);}
}

/* 防止溢出的处理 */
  .dropdown {left: auto;right: 0;}
  .nav-item:first-child .dropdown {left: 0;right: auto;}
  .nav-item:nth-child(2) .dropdown {left: 50%;right: auto;transform: translateX(-50%) translateY(-10px);}
  .nav-item:nth-child(2):hover .dropdown {transform: translateX(-50%) translateY(0);}

.content {max-width: var(--web-max-width);margin: 40px auto;padding: 0 20px;text-align: center;}
.content h1 {color: var(--primary-color);margin-bottom: 20px;font-size: 2.5rem;}
.content p{max-width:600px;margin:0 auto 40px}
.selector-wrapper{display:flex;gap:10px;margin:30px auto;width:100%;align-items:center;justify-content:center;}
.selector-wrapper select,.selector-wrapper input[type="date"],.selector-wrapper .submit-btn{flex:1;padding:0.2rem;height:38px;border:2px solid var(--primary-color);border-radius:4px}
.selector-wrapper .submit-btn{background-color:var(--primary-color);color:#fff;cursor:pointer;transition:all 0.3s ease;flex:0 0 auto;padding:0 8px;}
.selector-wrapper .submit-btn:hover{background-color:#a51c1c}
input[type="date"]::-webkit-datetime-edit{font-size:1.2em}
.container-wrapper{background:#efe;border-radius:8px;padding:2rem;position:relative;overflow:hidden;border:2px solid var(--dark-color);box-shadow:0 4px 12px rgba(0,0,0,0.1)}