/* ===================================================================
   飞鸟机场 - 天文台蓝图线稿落地页样式表 (style.css)
   世界观：天文台（星图、望远镜、星座连线、观测日志）
   画风：蓝图线稿（单色线条、尺寸标注、网格底纹）
   版式原型：导览地图（区块是地图上的地点，路径线连接）
   配色：夜景 + 主色相 215°（深蓝青）
   招牌动效：节点连线点亮（滚动到区块，星图/航线上对应节点亮起）
   =================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 核心色板 (严格遵循设计说明) */
  --bg-deep:        #0B1426;   /* 主背景，极深蓝 */
  --line-primary:   #7EB8D4;   /* 主要线条与星座连线 */
  --line-dim:       #3A5A78;   /* 次级网格与未激活节点 */
  --accent-warm:    #E8C07A;   /* 高明度暖光源（仅用于当前高亮节点与主 CTA） */
  --text-main:      #E6EEF5;   /* 正文，对比度 ≈ 12:1 */
  --text-muted:     #8FA8C0;   /* 辅助文字 */
  --card-bg:        #121C2E;   /* 内容区块底色 */

  /* 蓝图拓展与辅助色阶 */
  --blueprint-grid:    rgba(58, 90, 120, 0.16);
  --blueprint-subgrid: rgba(58, 90, 120, 0.07);
  --card-border:       rgba(126, 184, 212, 0.22);
  --card-border-hover: rgba(126, 184, 212, 0.55);
  --line-glow:         rgba(126, 184, 212, 0.3);
  --warm-glow:         rgba(232, 192, 122, 0.35);

  /* 尺寸与规范 */
  --max-width: 1140px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --header-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--bg-deep);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  /* 蓝图网格纸质底纹背景 */
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(126, 184, 212, 0.08) 0%, transparent 65%),
    linear-gradient(var(--blueprint-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--blueprint-grid) 1px, transparent 1px),
    linear-gradient(var(--blueprint-subgrid) 1px, transparent 1px),
    linear-gradient(90deg, var(--blueprint-subgrid) 1px, transparent 1px);
  background-size: 100% 100%, 100px 100px, 100px 100px, 20px 20px, 20px 20px;
  background-position: 0 0, -1px -1px, -1px -1px, -1px -1px, -1px -1px;
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

a {
  color: var(--line-primary);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

a:hover {
  color: var(--text-main);
}

ul, ol {
  list-style: none;
}

/* 容器通用 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
}

/* 尺寸与坐标标尺辅助修饰 */
.blueprint-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--line-primary);
  text-transform: uppercase;
}

/* ===================================================================
   招牌动效：导览地图与星图连线点亮系统
   =================================================================== */

/* 页面侧边导览路径指示条 (桌面端可见) */
.sky-chart-guide-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 16px 8px;
  background: rgba(11, 20, 38, 0.85);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
}

.sky-guide-node {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  color: var(--text-muted);
}

.sky-guide-node .node-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--line-dim);
  border: 1px solid var(--line-dim);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.sky-guide-node .node-tooltip {
  position: absolute;
  right: 36px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 8px;
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  opacity: 0;
  transform: translateX(6px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.sky-guide-node:hover .node-tooltip {
  opacity: 1;
  transform: translateX(0);
}

/* 激活点亮状态 */
.sky-guide-node.is-active .node-dot {
  background-color: var(--accent-warm);
  border-color: var(--accent-warm);
  box-shadow: 0 0 10px var(--warm-glow);
  transform: scale(1.4);
}

/* 区块点亮连接线 */
.blueprint-waypoint-bar {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 12px;
  background: rgba(58, 90, 120, 0.2);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.blueprint-waypoint-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-dim);
  border: 1px solid var(--line-primary);
  transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

.is-observed .blueprint-waypoint-dot {
  background: var(--accent-warm);
  box-shadow: 0 0 8px var(--warm-glow);
}

/* ===================================================================
   顶部导航 Header (观测台顶部方位指示牌)
   =================================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(11, 20, 38, 0.88);
  border-bottom: 1px solid var(--line-dim);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.site-header.is-scrolled {
  background-color: rgba(11, 20, 38, 0.96);
  border-bottom-color: var(--line-primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* 品牌 Logo (天文台望远镜方位十字标) */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-main);
  letter-spacing: 0.04em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border: 1px solid var(--line-primary);
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.brand-icon::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  right: 2px;
  bottom: 2px;
  border: 1px dashed var(--line-dim);
  pointer-events: none;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 2px;
  background-color: rgba(126, 184, 212, 0.12);
  color: var(--line-primary);
  border: 1px solid var(--line-dim);
}

/* 导航链接 (星座方位标) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 2px;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.nav-link .constellation-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--line-primary);
  opacity: 0.8;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--line-primary);
  transition: width 0.25s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.menu-toggle {
  display: none;
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  color: var(--text-main);
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* 移动端抽屉菜单 (桌面端默认隐藏) */
.mobile-nav-panel {
  display: none;
}

/* ===================================================================
   按钮系统规范
   规则：主 CTA 唯一使用 --accent-warm，不与其他元素共用
   =================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}

/* 主 CTA 唯一使用 --accent-warm */
.btn-primary {
  background-color: var(--accent-warm);
  color: #0B1426;
  border-color: #f3d498;
  font-weight: 700;
  box-shadow: 0 0 16px var(--warm-glow);
}

.btn-primary:hover {
  background-color: #edd092;
  color: #050a14;
  box-shadow: 0 0 24px rgba(232, 192, 122, 0.55);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--line-primary);
}

.btn-secondary:hover {
  background-color: rgba(126, 184, 212, 0.12);
  border-color: var(--text-main);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-outline-dim {
  background: transparent;
  color: var(--text-muted);
  border: 1px dashed var(--line-dim);
}

.btn-outline-dim:hover {
  border-color: var(--line-primary);
  color: var(--text-main);
}

.btn-lg {
  padding: 13px 30px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   Hero 区域 (穹顶望远镜主镜视角 + 当前观测目标标注)
   =================================================================== */

.hero-section {
  position: relative;
  padding: 70px 0 90px;
  overflow: hidden;
  border-bottom: 1px solid var(--line-dim);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
}

/* 观测标定徽章 */
.hero-tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  background-color: rgba(58, 90, 120, 0.25);
  border: 1px solid var(--line-primary);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--line-primary);
  margin-bottom: 24px;
}

.hero-tag-pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-warm);
  box-shadow: 0 0 8px var(--warm-glow);
}

/* H1: 48–56px / 700 / 字距 0.04em */
.hero-title {
  font-size: clamp(34px, 4.6vw, 54px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: 0.04em;
  margin-bottom: 20px;
}

.hero-title-highlight {
  color: var(--line-primary);
  text-shadow: 0 0 20px rgba(126, 184, 212, 0.3);
}

.hero-subtitle {
  font-size: 1.12rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-guarantees {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px dashed var(--line-dim);
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.guarantee-item svg {
  color: var(--line-primary);
}

/* 望远镜主镜线稿视口 (Telescope Reticle Diagram) */
.hero-telescope-viewport {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

.hero-telescope-viewport::before,
.hero-telescope-viewport::after {
  content: "+";
  position: absolute;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--line-primary);
}

.hero-telescope-viewport::before { top: 6px; left: 8px; }
.hero-telescope-viewport::after { bottom: 6px; right: 8px; }

.reticle-box {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px dashed var(--line-dim);
  border-radius: 50%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(126, 184, 212, 0.05) 0%, transparent 70%);
}

.reticle-crosshair-h {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-primary), transparent);
}

.reticle-crosshair-v {
  position: absolute;
  left: 50%;
  top: 0;
  height: 100%;
  width: 1px;
  background: linear-gradient(0deg, transparent, var(--line-primary), transparent);
}

.reticle-target-core {
  width: 24px;
  height: 24px;
  border: 1px solid var(--accent-warm);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--warm-glow);
  position: relative;
  animation: pulse-core 3s infinite ease-in-out;
}

@keyframes pulse-core {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50% { transform: scale(1.15); opacity: 1; }
}

.reticle-telemetry {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--line-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line-primary);
}

/* ===================================================================
   通用区块标题系统 (H2: 28–32px / 600)
   =================================================================== */

.section-py {
  padding: 85px 0;
  position: relative;
  border-bottom: 1px solid var(--line-dim);
}

.section-py-alt {
  background-color: rgba(18, 28, 46, 0.45);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--line-primary);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 32px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-main);
  letter-spacing: 0.02em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===================================================================
   特性模块 (星图上的主要观测点，每个特性是一颗被连线的星)
   =================================================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.feature-card {
  background-color: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 20px;
  width: 24px;
  height: 2px;
  background-color: var(--line-primary);
  transition: width 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-primary);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}

.feature-card:hover::before {
  width: 48px;
}

.feature-star-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line-primary);
}

.feature-star-id {
  padding: 2px 6px;
  background: rgba(126, 184, 212, 0.1);
  border: 1px solid var(--line-dim);
  border-radius: 2px;
}

.feature-icon-wrapper {
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  background: rgba(11, 20, 38, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--line-primary);
  transition: border-color 0.3s ease, color 0.3s ease;
}

.feature-card:hover .feature-icon-wrapper {
  border-color: var(--line-primary);
  color: var(--accent-warm);
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   人群对照模块 (三大科室与观测权限定位)
   =================================================================== */

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.audience-card {
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.audience-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--line-primary);
  margin-bottom: 12px;
}

.audience-name {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 14px;
}

.audience-concerns {
  margin: 18px 0;
  padding: 16px;
  background: rgba(11, 20, 38, 0.6);
  border-left: 2px solid var(--line-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.audience-concerns h4 {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--line-primary);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.audience-concerns p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.audience-recommend {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px dashed var(--line-dim);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

.audience-recommend-tag {
  color: var(--accent-warm);
  font-weight: 600;
}

/* ===================================================================
   流媒体与 AI 光谱解析矩阵
   =================================================================== */

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.matrix-card {
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 32px;
}

.matrix-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.matrix-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.matrix-items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
}

.matrix-pill {
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  border-radius: var(--radius-sm);
  background: rgba(11, 20, 38, 0.8);
  border: 1px solid var(--line-dim);
  color: var(--text-main);
}

/* ===================================================================
   定价卡模块 (三档观测权限卡：访客 / 研究员 / 首席)
   =================================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-primary);
}

/* 研究员档（推荐档）高亮标注 */
.pricing-card.is-popular {
  border-color: var(--accent-warm);
  background: linear-gradient(180deg, rgba(232, 192, 122, 0.05) 0%, var(--card-bg) 100%);
  box-shadow: 0 8px 32px rgba(232, 192, 122, 0.12);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-warm);
  color: #0B1426;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pricing-tier-code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line-primary);
  margin-bottom: 8px;
}

.pricing-tier-name {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.pricing-audience {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 44px;
}

.pricing-status-notice {
  padding: 12px 14px;
  background: rgba(11, 20, 38, 0.7);
  border: 1px dashed var(--line-dim);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.status-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.status-value {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--line-primary);
}

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.pricing-feature-item svg {
  color: var(--line-primary);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ===================================================================
   使用场景模块 (不同观测时段的日志页)
   =================================================================== */

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
}

.scenario-log-stamp {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border: 1px solid var(--line-primary);
  border-radius: 2px;
  color: var(--line-primary);
  margin-bottom: 14px;
}

.scenario-time-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
}

.scenario-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   FAQ 模块 (观测日志问答栏，问答以「观测记录」形式呈现)
   =================================================================== */

.faq-grid {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-card {
  background-color: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.faq-card:hover {
  border-color: var(--line-primary);
}

.faq-card[open] {
  border-color: var(--line-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-record-id {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  border: 1px solid var(--line-dim);
  border-radius: 2px;
  color: var(--line-primary);
  flex-shrink: 0;
}

.faq-answer {
  padding: 0 24px 22px 58px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ===================================================================
   Final CTA 尾屏 (控制台启动按钮区，视觉为「开启观测」闸门)
   =================================================================== */

.final-cta-section {
  padding: 95px 0 110px;
  position: relative;
  background-color: rgba(18, 28, 46, 0.6);
  border-bottom: 1px solid var(--line-dim);
}

.final-cta-card {
  background: var(--card-bg);
  border: 1px solid var(--line-primary);
  border-radius: var(--radius-md);
  padding: 54px 40px;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  position: relative;
  box-shadow: 0 0 40px rgba(126, 184, 212, 0.12);
}

.final-cta-card::before,
.final-cta-card::after {
  content: "GATE-01 // READY";
  position: absolute;
  top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--line-primary);
}

.final-cta-card::before { left: 18px; }
.final-cta-card::after { right: 18px; content: "SYS // NOMINAL"; }

.final-cta-title {
  font-size: clamp(28px, 3.8vw, 40px);
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}

.final-cta-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 34px;
}

.final-cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* ===================================================================
   页脚 Footer (台站底部的坐标与维护公告栏)
   =================================================================== */

.site-footer {
  background-color: #070D18;
  border-top: 1px solid var(--line-dim);
  padding: 64px 0 34px;
  position: relative;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 380px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-col h4::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 14px;
  background-color: var(--line-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-links a:hover {
  color: var(--text-main);
  transform: translateX(3px);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(58, 90, 120, 0.3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-disclosure {
  font-size: 0.84rem;
  color: var(--text-muted);
}

/* ===================================================================
   移动端吸底悬浮栏
   =================================================================== */

.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(11, 20, 38, 0.94);
  border-top: 1px solid var(--line-primary);
  backdrop-filter: blur(12px);
  padding: 12px 16px;
  z-index: 99;
}

.mobile-sticky-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mobile-sticky-info {
  display: flex;
  flex-direction: column;
}

.mobile-sticky-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.mobile-sticky-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===================================================================
   通用内容页 / 文章排版样式 (指南页与 6 篇长文)
   =================================================================== */

.article-container {
  max-width: 820px;
  margin: 40px auto 80px;
  padding: 0 20px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--line-primary);
}

.breadcrumbs-sep {
  color: var(--line-dim);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line-dim);
}

.article-meta-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--line-primary);
  padding: 3px 10px;
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.article-title {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 18px;
}

.article-intro-box {
  background: var(--card-bg);
  border-left: 3px solid var(--line-primary);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--text-main);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-main);
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line-dim);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
  color: var(--text-main);
}

.article-content ul, .article-content ol {
  margin: 18px 0 24px 24px;
}

.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }

.article-content li {
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.92rem;
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--line-dim);
  text-align: left;
}

.article-content th {
  background: rgba(58, 90, 120, 0.25);
  color: var(--line-primary);
  font-weight: 600;
}

.callout-box {
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin: 28px 0;
}

.callout-box.tip {
  border-left: 3px solid var(--line-primary);
}

.callout-box.warning {
  border-left: 3px solid var(--accent-warm);
}

.callout-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--text-main);
}

.related-posts-section {
  margin: 48px 0;
  padding-top: 32px;
  border-top: 1px solid var(--line-dim);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.related-post-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--line-dim);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.related-post-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-primary);
}

.related-post-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.related-post-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

.article-end-cta {
  background: var(--card-bg);
  border: 1px solid var(--line-primary);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  text-align: center;
  margin: 50px 0 20px;
}

.article-end-cta h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-end-cta p {
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 22px;
  font-size: 0.95rem;
}

/* ===================================================================
   响应式断点媒体查询
   =================================================================== */

@media (max-width: 1024px) {
  .sky-chart-guide-nav {
    display: none;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .mobile-sticky-bar {
    display: block;
  }
  body {
    padding-bottom: 65px;
  }
  .pricing-grid,
  .audience-grid,
  .scenarios-grid,
  .matrix-grid,
  .related-posts-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-title {
    font-size: 2rem;
  }
  .final-cta-card {
    padding: 36px 20px;
  }
  
  /* 移动端抽屉菜单 */
  .mobile-nav-panel {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(11, 20, 38, 0.97);
    border-bottom: 1px solid var(--line-primary);
    padding: 20px;
    z-index: 99;
    backdrop-filter: blur(12px);
  }
  .mobile-nav-panel.is-open {
    display: block;
  }
  .mobile-menu-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 20px;
  }
  .mobile-menu-list a {
    font-size: 1.05rem;
    color: var(--text-main);
  }
}

/* 无障碍与减弱动画 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .sky-guide-node .node-dot {
    background-color: var(--accent-warm) !important;
    border-color: var(--accent-warm) !important;
  }
}