/* ===== 全局样式 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --deep-blue: #003566;
  --gold: #FFC700;
  --blue-10: #E5EBF0;
  --blue-30: #B4BFCD;
  --blue-60: #6C7B90;
  --blue-80: #364D66;
  --gold-10: #FFF5E6;
  --gold-30: #FFE1B3;
  --gold-60: #FFC866;
  --gold-80: #FFB833;
  --text-dark: #1a2a3a;
  --text-soft: #2c3e4e;
  --border-light: var(--blue-30);
  --header-height: 80px;
  --shadow: 0 10px 30px rgba(0,53,102,0.08);
  --border-radius: 12px;
}

body {
  background-color: var(--blue-10);
  font-family: 'Inter', sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
  font-size: 1rem; /* 默认正文字体大小，约16px */
}

html { scroll-behavior: smooth; }

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

h1, h2, h3, .logo, .hero-title, .section-title {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.6rem;
  margin-bottom: 2rem;
  color: var(--deep-blue);
  position: relative;
  display: inline-block;
}
h2:after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 70px;
  height: 3px;
  background: var(--gold);
  border-radius: 2px;
}

/* 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(0, 53, 102, 0.92);
  backdrop-filter: blur(10px);
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255,199,0,0.2);
  transition: background 0.2s;
}
.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}
.logo {
  font-size: 1.75rem;
  color: white;
  text-decoration: none;
  white-space: nowrap;
}
.logo .gold { color: var(--gold); }
.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}
.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 400;
  font-size: 1rem;
  transition: color 0.2s;
  letter-spacing: 0.3px;
}
.nav-links a:hover { color: var(--gold); }

/* 二级菜单基础样式 */
.submenu {
  background: var(--deep-blue);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  padding: 0.5rem 0;
  z-index: 1002;
  pointer-events: auto;
  border: 1px solid rgba(255,199,0,0.2);
}

.submenu li {
  width: 100%;
}

.submenu a {
  display: block;
  padding: 0.8rem 1.5rem;
  color: white;
  text-decoration: none;
  transition: background 0.2s;
  text-align: left;
  font-size: 0.95rem;
}

.submenu a:hover {
  background: rgba(255,199,0,0.1);
  color: var(--gold);
}

/* 桌面端二级菜单 (≥769px) */
@media (min-width: 769px) {
  .has-submenu {
    position: relative;
  }
  
  .submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
  }
  
  .has-submenu:hover .submenu,
  .has-submenu:focus-within .submenu,
  .has-submenu .submenu:hover {
    opacity: 1;
    visibility: visible;
  }
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: white;
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: calc(var(--header-height) - 1px);
    left: 0;
    width: 100%;
    background: var(--deep-blue);
    backdrop-filter: none;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1.5rem 0;
    display: none;
    z-index: 1001;
  }
  .header.menu-open {
    border-bottom-color: transparent;
  }
  .nav-links.show {
    display: flex;
  }
  .nav-links li {
    width: 100%;
    text-align: center;
    padding: 1rem 0;
    position: relative;
  }
  .has-submenu .submenu {
    position: static;
    display: block;
    opacity: 1 !important;
    visibility: visible !important;
    background: rgba(0,0,0,0.2);
    border: none;
    box-shadow: none;
    padding: 0;
    margin-top: 0.5rem;
    min-width: auto;
  }
  .has-submenu.active .submenu {
    display: block;
  }
  .submenu li {
    padding: 0.5rem 0;
  }
  .submenu a {
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
  }
  .menu-toggle { display: block; font-size: 1.6rem; }
  .logo {
    font-size: 1.5rem;
  }
}

main { padding-top: var(--header-height); }

/* hero */
.hero {
  background: linear-gradient(145deg, var(--deep-blue) 0%, var(--deep-blue) 70%, var(--gold-60) 150%);
  color: white;
  padding: 6rem 0 8rem;
  position: relative;
  overflow: hidden;
}
.hero:before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,199,0,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-content {
  max-width: 990px;
  position: relative;
  z-index: 2;
}
.hero-title {
  font-size: clamp(3rem, 8vw, 5.2rem);
  line-height: 1.1;
  margin-bottom: 1rem;
}
.hero-sub {
  font-size: 1.8rem;
  font-weight: 300;
  margin-bottom: 1.5rem;
  color: var(--gold);
  font-family: 'Playfair Display', serif;
  font-style: italic;
}
.hero-desc {
  font-size: 1.2rem;
  max-width: 700px;
  opacity: 0.9;
  border-left: 4px solid var(--gold);
  padding-left: 1.5rem;
}

/* 通用区块 */
section { padding: 5rem 0; }
.bg-light { background-color: white; }
.bg-alt { background-color: var(--blue-10); }
.gold-accent { color: var(--gold); }

/* 卡片网格 */
.grid-4, .grid-3, .grid-2 {
  display: grid;
  gap: 2rem;
  margin: 2.5rem 0;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: white;
  padding: 2rem 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-top: 3px solid var(--gold);
  transition: transform 0.2s;
}
.card:hover { transform: translateY(-5px); }
.card h3 {
  font-size: 1.5rem;
  color: var(--deep-blue);
  margin-bottom: 1rem;
}
.card .icon { color: var(--gold); font-size: 2rem; margin-bottom: 0.8rem; }

.philosophy-feature {
  background: var(--blue-10);
  padding: 2rem;
  border-radius: var(--border-radius);
  border-left: 6px solid var(--gold);
}

.pillar-list {
  list-style: none;
}
.pillar-list li {
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
}
.pillar-list li i {
  color: var(--gold);
  width: 2rem;
  font-size: 1.2rem;
}

/* 卡片项 (用于特权、基石等详细描述) */
.card-item {
  background: white;
  border-radius: 20px;
  padding: 1.8rem 2rem;
  margin-bottom: 1.8rem;
  box-shadow: 0 6px 12px rgba(0, 53, 102, 0.04);
  border-left: 6px solid var(--deep-blue);
}
.card-item h5 {
  font-size: 1.4rem;
  color: var(--deep-blue);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.card-item h5 i { color: var(--gold-60); font-size: 1.4rem; }
.sub-label {
  font-weight: 650;
  color: var(--blue-80);
  margin: 1.2rem 0 0.2rem;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.sub-label i { color: var(--gold-60); font-size: 1.3rem; }

/* 表格响应式 */
.table-responsive {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: 20px;
  border: 1px solid var(--blue-30);
  background: white;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 500px;
}
th {
  background-color: var(--deep-blue);
  color: white;
  font-weight: 600;
  padding: 0.9rem 1rem;
  text-align: left;
}
td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--blue-30);
}
tr:last-child td { border-bottom: none; }

/* 状态徽章 */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--blue-10);
  padding: 0.2rem 0.8rem;
  border-radius: 30px;
  font-size: 0.9rem;
  white-space: nowrap;
}
.status-badge.done { background: var(--gold-10); color: var(--deep-blue); }
.status-badge.pending { background: var(--blue-30); color: var(--blue-80); }

/* 色块 */
.color-swatch {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.1);
  vertical-align: middle;
  margin-right: 0.3rem;
}

/* 缩写规范卡片 */
.abbr-level {
  background: white;
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.badge {
  background: var(--gold);
  color: var(--deep-blue);
  padding: 0.2rem 1rem;
  border-radius: 30px;
  font-weight: 600;
  display: inline-block;
  margin-bottom: 0.5rem;
}
.forbidden { color: #b33; text-decoration: line-through; }

/* 命名框 */
.naming-box {
  background: linear-gradient(135deg, var(--deep-blue) 0%, var(--deep-blue) 100%);
  color: white;
  padding: 3rem;
  border-radius: var(--border-radius);
}
.naming-box .gold { color: var(--gold); }
.naming-pair {
  display: flex;
  gap: 3rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}
.pair-table {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  padding: 1.5rem;
}
.pair-table td { border-bottom: 1px solid rgba(255,199,0,0.2); }

/* 返回顶部 */
.go-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  background: linear-gradient(135deg, var(--deep-blue), var(--gold));
  color: white;
  width: 56px;
  height: 56px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(0,53,102,0.3);
  font-size: 1.8rem;
  opacity: 0.95;
  transition: 0.2s;
  z-index: 99;
  text-decoration: none;
  border: 2px solid white;
}
.go-top:hover {
  opacity: 1;
  transform: scale(1.07);
  background: linear-gradient(135deg, var(--blue-80), var(--gold-80));
}

/* 向下箭头 */
.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 0;
  width: 100%;
  text-align: center;
  color: white;
  font-size: 2rem;
  z-index: 10;
}

/* 页脚 */
.footer {
  background: var(--deep-blue);
  color: white;
  padding: 2rem 0;
  text-align: center;
  border-top: 4px solid var(--gold);
}

/* 列表样式 */
.section-card ul, .section-card ol,
.card-item ul, .card-item ol,
.philosophy-feature ul, .philosophy-feature ol,
.container ul, .container ol {
  padding-left: 2rem;
  margin: 1rem 0;
}
.section-card li,
.card-item li,
.philosophy-feature li,
.container li {
  margin-bottom: 0.5rem;
}

/* 信念列表突出样式 */
.belief-list {
  background: var(--gold-10);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  list-style-position: inside;
  border-left: 4px solid var(--gold);
  margin: 1.5rem 0;
}
.belief-list li {
  margin-bottom: 0.8rem;
  line-height: 1.5;
}

/* 响应式 */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  h2 { font-size: 2rem; }
  body { font-size: 0.9rem; } /* 小屏幕下调整为0.9rem */
}

/* 其它工具类 */
.text-center { text-align: center; }
.section-card {
  background: white;
  border-radius: 28px;
  padding: 2rem 2rem;
  margin: 2.5rem 0;
}
.section-card.alt-bg { background: var(--gold-10); }
.mt-5 { margin-top: 3rem; }