/* --- 全局变量与重置 (保持与第一页一致) --- */
:root {
  --bg-dark: #0f1012;
  --panel-bg: #1A1A1A;
  /* 卡片背景色 */
  --coral: #E37B58;
  /* 珊瑚色 */
  --text-gray: #888888;
  --border-color: #333;

  --font-serif: "Songti SC", "SimSun", "Times New Roman", serif;
  --font-sans: "DengXian", "Microsoft YaHei", sans-serif;
  --font-mono: "Consolas", "Courier New", monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-dark);
  color: white;
  font-family: var(--font-sans);
  height: 100vh;
  overflow: hidden;
  /* 防止页面滚动 */
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
  color: inherit;
  /* 自定义固定颜色，替换成你想要的颜色即可 */
}

/* --- 顶部导航 --- */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 40px;
  background: rgba(0, 0, 0, 0.3);
}

.header-left .back-btn {
  background: none;
  border: none;
  color: #ccc;
  font-size: 14px;
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: color 0.3s ease;
}

.header-left .back-btn:hover {
  color: #ffffff;
}

.nav-center {
  text-align: center;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 2px;
  margin-left: 230px;
}

.logo-en {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: #fff;
  margin-top: 2px;
  margin-left: 230px;
}

.nav-right {
  display: flex;
  gap: 20px;
}

.nav-item {
  font-size: 15px;
  padding: 6px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  color: #949292;

}

.nav-item.active {
  background-color: rgba(227, 123, 88, 0.2);
  color: var(--coral);
  background-color: #e9825f;
  color: #000000;
  font-weight: bold;
}

.nav-item:hover:not(.active) {
  color: #fff;
}

/* --- 页面主体 --- */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px;
}

/* 标题区 */
.hero-section {
  text-align: center;
  margin-bottom: 50px;
  margin-top: 20px;
}

.page-title {
  font-family: var(--font-serif);
  font-size: 40px;
  font-weight: 800;
  color: var(--coral);
  margin-bottom: 15px;
  letter-spacing: 2px;
}

.page-subtitle {
  font-size: 18px;
  color: #fff;
  letter-spacing: 1px;
}

/* 内容大卡片 */
.content-card {
  background-color: var(--panel-bg);
  width: 100%;
  max-width: 1000px;
  border-radius: 16px;
  padding: 50px 60px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  border: 1px solid #252525;
}

.section-header {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 500;
  text-align: center;
  margin-bottom: 40px;
  color: #eee;
}

/* 网格布局 */
.content-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  /* 左侧稍宽 */
  gap: 80px;
}

/* --- 左侧样式 --- */
.text-block {
  font-size: 18px;
  line-height: 1.8;
  color: #ccc;
  margin-bottom: 20px;
  text-align: justify;
}

/* 公式盒子 */
.formula-box {
  margin-top: 40px;
  background: #251b18;
  border: 1px solid #bc7e69;
  /* 珊瑚色边框 */
  border-radius: 8px;
  padding: 20px;
  position: relative;
}

.formula-label {
  font-size: 16px;
  color: #a1a0a0;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.formula-math {
  font-family: var(--font-mono);
  font-size: 20px;
  /* 稍微大一点更清晰 */
  color: var(--coral);
  margin-bottom: 15px;
  letter-spacing: 1px;
}

.formula-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  font-size: 15px;
  color: #afafaf;
  border-top: 1px solid #333;
  padding-top: 10px;
}

/* --- 右侧样式 --- */
.list-title {
  font-size: 20px;
  color: var(--coral);
  margin-bottom: 20px;
  font-weight: normal;
}

.factors-table {
  width: 100%;
}

.table-header,
.table-row {
  display: flex;
  padding: 15px 0;
  border-bottom: 1px solid #333;
}

.table-header {
  font-size: 18px;
  color: #999;
  border-bottom: 1px solid #444;
}

.table-header span:first-child,
.table-row .factor-name {
  width: 35%;
  /* 第一列宽度 */
}

.table-header span:last-child,
.table-row .factor-desc {
  flex: 1;
}

.table-row {
  font-size: 17px;
  color: #ddd;
  align-items: center;
}

.table-row:last-child {
  border-bottom: none;
}

.factor-name {
  color: #ccc;
}

.factor-desc {
  color: #999;
}

/* 响应式微调 */
@media (max-width: 768px) {
  .content-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .content-card {
    padding: 30px;
  }
}

/* --- 响应式适配 (移动端: 屏幕宽度小于768px) --- */

@media (max-width: 768px) {

  body {
    height: auto;
    overflow-y: auto;
    overflow-x: hidden;
  }

  header {
    flex-direction: column;

    padding: 15px 15px 10px 15px;
    gap: 15px;

    position: relative;
  }


  .header-left {
    position: absolute;
    left: 15px;
    top: 20px;
  }

  .logo-text,
  .logo-en {
    margin-left: 0;
    text-align: center;
  }

  .nav-right {
    width: 100%;
    justify-content: center;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 5px;
  }

  .nav-item {
    font-size: 12px;
    padding: 6px 10px;
    white-space: nowrap;

  }
}