/* ==============================================================================
   Quant-FX Research - 全局视觉与现代外汇量化展示大盘样式表 (style.css)
   基于纯原生现代 CSS，完全零外部依赖，极简深色极客设计
   ============================================================================== */

:root {
  /* 基础暗黑背景与面板色阶 */
  --bg-canvas: #0D1117;
  --bg-surface: #161B22;
  --bg-subtle: #1F242C;
  --bg-glass: rgba(22, 27, 34, 0.85);
  --border-default: #30363D;
  --border-muted: #21262D;

  /* 文字色阶 */
  --text-primary: #E6EDF3;
  --text-secondary: #8B949E;
  --text-muted: #6E7681;

  /* 外汇核心多空与资产高光色 */
  --color-accent: #58A6FF;
  --color-bull: #3FB950;
  --color-bear: #F85149;
  --color-gold: #D29922;
  --color-purple: #BC8CFF;
  --color-cyan: #39C5BB;

  /* 字体家族 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Roboto Mono', Consolas, monospace;

  /* 排版尺寸与行高 */
  --line-height-normal: 1.65;
  --max-content-width: 1240px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: var(--line-height-normal);
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scrollbar-width: thin;
  scrollbar-color: var(--border-default) var(--bg-canvas);
}

/* 全局滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-canvas);
}
::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* 链接样式 */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s ease;
}
a:hover {
  text-decoration: underline;
  opacity: 0.85;
}

/* 极简毛玻璃顶栏导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  transition: background-color 0.3s ease;
}

.nav-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-logo img, .brand-logo svg {
  width: 28px;
  height: 28px;
}

.brand-logo span {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(88, 166, 255, 0.15);
  color: var(--color-accent);
  border: 1px solid rgba(88, 166, 255, 0.3);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-item {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.nav-item:hover {
  color: var(--text-primary);
  background-color: var(--bg-subtle);
  text-decoration: none;
}

.nav-item.active {
  color: var(--color-accent);
  background-color: rgba(88, 166, 255, 0.12);
  font-weight: 600;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  font-size: 1.2rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}

/* 主容器 */
.docs-container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* 文章正文流式布局 */
.content-stream {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Hero 文章头部 */
.article-header {
  border-bottom: 1px solid var(--border-default);
  padding-bottom: 1.8rem;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.article-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 900px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
  margin-top: 1.2rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* 等宽数字排版 */
.tabular-numbers {
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-default);
  padding: 2.5rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  background-color: var(--bg-surface);
}

.site-footer p {
  margin-bottom: 0.4rem;
}