/* ====================================================================
   飞兔云 - 星轨中枢 · 异界数网 (Cyber Astral Anime UI)
   设计语言：暗夜天球底色 / 彩虹棱镜微光 / 星象图符与光轨 / 玻璃拟态 / 高转化动态CTA
   ==================================================================== */

:root {
  /* 基础系统字体栈（严禁加载外部中文字体） */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace;

  /* 核心主题色彩体系 */
  --bg-cosmos: #070a14;
  --bg-deep: #0b1122;
  --bg-surface: #101932;
  --bg-card: rgba(16, 26, 52, 0.72);
  --bg-card-hover: rgba(22, 36, 72, 0.88);
  --bg-glass: rgba(255, 255, 255, 0.04);

  /* 文字层级色 */
  --text-pure: #ffffff;
  --text-main: #f1f5f9;
  --text-sub: #94a3b8;
  --text-muted: #64748b;

  /* 异界动漫霓光与强调色 */
  --astral-cyan: #00f2fe;
  --astral-sky: #38bdf8;
  --astral-indigo: #6366f1;
  --astral-purple: #a855f7;
  --astral-sakura: #f43f5e;
  --astral-gold: #fbbf24;
  --astral-emerald: #10b981;

  /* 渐变流光 */
  --grad-primary: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #ec4899 100%);
  --grad-primary-hover: linear-gradient(135deg, #00f2fe 0%, #4f46e5 50%, #f43f5e 100%);
  --grad-starlight: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(168, 85, 247, 0.15) 100%);
  --grad-card-border: linear-gradient(135deg, rgba(56, 189, 248, 0.4), rgba(168, 85, 247, 0.2), rgba(255, 255, 255, 0.05));
  --grad-text-holo: linear-gradient(90deg, #ffffff 0%, #bae6fd 30%, #e0e7ff 70%, #fbcfe8 100%);

  /* 边框与光晕 */
  --border-glass: rgba(255, 255, 255, 0.09);
  --border-glow: rgba(56, 189, 248, 0.35);
  --border-active: rgba(0, 242, 254, 0.8);

  --shadow-neon: 0 0 30px rgba(56, 189, 248, 0.25);
  --shadow-sakura: 0 0 30px rgba(244, 63, 94, 0.25);
  --shadow-card: 0 16px 40px -12px rgba(0, 0, 0, 0.65);

  /* 几何与布局 */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --container-max: 1200px;
  --container-reading: 840px;
  --header-height: 72px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-cosmos);
  color: var(--text-main);
  line-height: 1.68;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-cosmos);
}

/* 链接基础 */
a {
  color: var(--astral-sky);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

a:hover {
  color: var(--text-pure);
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.6);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-pure);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

p {
  margin-bottom: 1rem;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.25rem;
}

img, svg {
  display: block;
  max-width: 100%;
}

.site-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 2;
}

.reading-container {
  width: 100%;
  max-width: var(--container-reading);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 2;
}

/* ====================================================================
   全屏动漫星轨与异界背景舞台 (Astrodome Stage)
   ==================================================================== */
.astral-stage-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 宇宙星云弥散光晕 */
.nebula-glow-layer {
  position: absolute;
  width: 150%;
  height: 150%;
  top: -25%;
  left: -25%;
  background:
    radial-gradient(circle at 18% 22%, rgba(56, 189, 248, 0.16) 0%, transparent 45%),
    radial-gradient(circle at 82% 18%, rgba(168, 85, 247, 0.18) 0%, transparent 48%),
    radial-gradient(circle at 50% 65%, rgba(244, 63, 94, 0.08) 0%, transparent 55%),
    radial-gradient(circle at 75% 85%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-cosmos) 0%, var(--bg-deep) 100%);
  filter: blur(50px);
}

/* 赛博透视网格阵列 */
.astral-grid-matrix {
  position: absolute;
  bottom: 0;
  left: -50%;
  width: 200%;
  height: 55%;
  background-image:
    linear-gradient(to right, rgba(56, 189, 248, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.07) 1px, transparent 1px);
  background-size: 54px 54px;
  transform: perspective(600px) rotateX(68deg);
  transform-origin: bottom center;
  mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, transparent 80%);
  -webkit-mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, transparent 80%);
}

/* 漂浮的星之光辉粒子微尘 (Pure CSS) */
.starlight-sparkle {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, #ffffff 0%, rgba(56, 189, 248, 0.8) 40%, transparent 70%);
  filter: blur(1px);
  opacity: 0.6;
  animation: starlight-float 10s ease-in-out infinite alternate;
}

.sparkle-1 { width: 140px; height: 140px; top: 15%; left: 8%; opacity: 0.18; animation-duration: 9s; }
.sparkle-2 { width: 220px; height: 220px; top: 40%; right: 6%; opacity: 0.14; animation-duration: 13s; }
.sparkle-3 { width: 180px; height: 180px; bottom: 15%; left: 30%; opacity: 0.12; animation-duration: 11s; }

@keyframes starlight-float {
  0% { transform: translateY(0) scale(1); }
  100% { transform: translateY(-30px) scale(1.18); }
}

/* 流星轨迹 */
.shooting-star-group {
  position: absolute;
  width: 100%;
  height: 100%;
}

.shooting-star {
  position: absolute;
  width: 3px;
  height: 90px;
  background: linear-gradient(180deg, #ffffff 0%, var(--astral-cyan) 60%, transparent 100%);
  border-radius: 999px;
  filter: drop-shadow(0 0 6px var(--astral-cyan));
  transform: rotate(-42deg);
  opacity: 0;
  animation: shooting-fall 8s linear infinite;
}

.star-1 { top: -5%; left: 45%; animation-delay: 0.5s; animation-duration: 7s; }
.star-2 { top: 10%; left: 80%; animation-delay: 3.5s; animation-duration: 6s; }
.star-3 { top: 2%; left: 20%; animation-delay: 5.8s; animation-duration: 8s; }

@keyframes shooting-fall {
  0% { transform: translate(0, 0) rotate(-42deg); opacity: 0; }
  6% { opacity: 0.9; }
  22% { transform: translate(-260px, 320px) rotate(-42deg); opacity: 0; }
  100% { opacity: 0; }
}

/* ====================================================================
   顶部导航 Header (玻璃拟态 + HUD 微光)
   ==================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(7, 10, 20, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  transition: all 0.25s ease;
}

.site-header.scrolled {
  background-color: rgba(7, 10, 20, 0.94);
  border-bottom-color: rgba(56, 189, 248, 0.24);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-pure);
  font-weight: 800;
  font-size: 1.28rem;
  position: relative;
}

.brand-wrapper:hover {
  text-decoration: none;
}

.brand-avatar-box {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.5);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.35);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(168, 85, 247, 0.2));
  flex-shrink: 0;
}

.brand-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-title-wrap {
  display: flex;
  flex-direction: column;
}

.brand-name-text {
  background: var(--grad-text-holo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-hud-status {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--astral-cyan);
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.pulse-beacon {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--astral-emerald);
  box-shadow: 0 0 8px var(--astral-emerald);
  display: inline-block;
  animation: beacon-ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes beacon-ping {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  color: var(--text-sub);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 0.25rem;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  border-radius: 999px;
  transition: width 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-pure);
  text-decoration: none;
}

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

.header-action {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-pure);
  transition: all 0.2s ease;
}

.menu-toggle:hover {
  border-color: var(--astral-sky);
  color: var(--astral-cyan);
}

/* ====================================================================
   CTA 按钮体系（呼吸光效 + 彩虹棱镜高光扫过 + 点击按压）
   ==================================================================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: var(--grad-primary);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.85rem 1.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.42), 0 0 0 1px rgba(56, 189, 248, 0.35);
  cursor: pointer;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

/* 按钮微光掠过动画 (Sheen Effect) */
.btn-primary::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -70%;
  width: 45%;
  height: 200%;
  background: linear-gradient(60deg, transparent 0%, rgba(255, 255, 255, 0.45) 50%, transparent 100%);
  transform: rotate(25deg);
  animation: btn-sheen 4.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  pointer-events: none;
}

@keyframes btn-sheen {
  0% { left: -70%; }
  25% { left: 140%; }
  100% { left: 140%; }
}

.btn-primary:hover {
  background: var(--grad-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(56, 189, 248, 0.55), 0 0 20px rgba(236, 72, 153, 0.4);
  color: #ffffff;
  text-decoration: none;
}

.btn-primary:active {
  transform: translateY(1px) scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: rgba(16, 25, 50, 0.75);
  backdrop-filter: blur(12px);
  color: var(--text-pure);
  font-size: 1rem;
  font-weight: 700;
  padding: 0.85rem 1.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 189, 248, 0.32);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.3);
  cursor: pointer;
  text-align: center;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-secondary:hover {
  background: rgba(22, 38, 76, 0.95);
  border-color: var(--astral-sky);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.3);
  color: var(--astral-cyan);
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-nav-cta {
  padding: 0.55rem 1.25rem;
  font-size: 0.9rem;
}

/* ====================================================================
   Hero 首屏二次元核心舞台 (Character Card + Parallax HUD)
   ==================================================================== */
.hero-section {
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero-grid-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-content-col {
  display: flex;
  flex-direction: column;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.95rem;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--astral-cyan);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.28);
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
  width: fit-content;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.15);
}

.hero-title {
  font-size: 3.1rem;
  line-height: 1.18;
  font-weight: 800;
  margin-bottom: 1.25rem;
  background: var(--grad-text-holo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-sub);
  margin-bottom: 2.25rem;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

/* 实时遥测指标 HUD 条 */
.telemetry-hud-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 1.2rem;
  background: rgba(16, 26, 52, 0.65);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.telemetry-item {
  display: flex;
  flex-direction: column;
  border-left: 2px solid rgba(56, 189, 248, 0.4);
  padding-left: 0.85rem;
}

.telemetry-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-pure);
  line-height: 1.2;
}

.telemetry-value.cyan { color: var(--astral-cyan); text-shadow: 0 0 12px rgba(0, 242, 254, 0.4); }
.telemetry-value.emerald { color: var(--astral-emerald); text-shadow: 0 0 12px rgba(16, 185, 129, 0.4); }
.telemetry-value.gold { color: var(--astral-gold); text-shadow: 0 0 12px rgba(251, 191, 36, 0.4); }

.telemetry-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ====================================================================
   右侧动漫角色视效卡片 (Character Stage + 3D Tilt + HUD Rings)
   ==================================================================== */
.hero-anime-col {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.anime-stage-frame {
  position: relative;
  width: 100%;
  max-width: 440px;
  perspective: 1200px;
}

/* 旋转星象符文环 */
.astral-rune-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 480px;
  height: 480px;
  border: 1px dashed rgba(56, 189, 248, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: ring-rotate 40s linear infinite;
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.1);
}

.astral-middle-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 380px;
  height: 380px;
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: ring-rotate 28s linear infinite reverse;
}

@keyframes ring-rotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.character-card-3d {
  position: relative;
  background: linear-gradient(180deg, rgba(20, 32, 64, 0.85) 0%, rgba(10, 16, 34, 0.95) 100%);
  border: 1px solid rgba(56, 189, 248, 0.38);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.75), 0 0 35px rgba(56, 189, 248, 0.25);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease;
  transform-style: preserve-3d;
  cursor: pointer;
}

.character-card-3d:hover {
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.85), 0 0 45px rgba(168, 85, 247, 0.35);
}

.character-visual-img {
  width: 100%;
  height: 520px;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.4s ease;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.4));
  animation: char-float 6s ease-in-out infinite alternate;
}

@keyframes char-float {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

/* 角色浮动信息标签 */
.floating-hud-badge {
  position: absolute;
  backdrop-filter: blur(12px);
  background: rgba(11, 19, 40, 0.88);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.95rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 5;
  transition: transform 0.3s ease;
}

.badge-top-right {
  top: 18px;
  right: 18px;
}

.badge-bottom-left {
  bottom: 24px;
  left: 20px;
  right: 20px;
}

.hud-badge-title {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-pure);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hud-badge-sub {
  font-size: 0.72rem;
  color: var(--text-sub);
  margin-top: 0.15rem;
}

/* ====================================================================
   区块结构与内容网格（Features / Scenarios / Specs）
   ==================================================================== */
.section-block {
  padding: 5.5rem 0;
  position: relative;
}

.section-block-alt {
  background: linear-gradient(180deg, rgba(16, 26, 52, 0.4) 0%, rgba(11, 17, 34, 0.6) 100%);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 3.5rem;
}

.section-subtitle-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--astral-cyan);
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.85rem;
  margin-bottom: 0.85rem;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  margin-bottom: 0.85rem;
  background: var(--grad-text-holo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* 特性卡网格 (Features 4 Cards + 悬停光晕跟随) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad-card-border);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0.6;
  transition: opacity 0.25s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.7), 0 0 30px rgba(56, 189, 248, 0.22);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.15rem;
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.18), rgba(168, 85, 247, 0.2));
  border: 1px solid rgba(56, 189, 248, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--astral-cyan);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.25);
  flex-shrink: 0;
}

.feature-card-title {
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--text-pure);
}

.feature-target-audience {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.18rem 0.55rem;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xs);
  color: var(--astral-sky);
  margin-top: 0.3rem;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card-body {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-sub);
}

/* ====================================================================
   全域边缘节点展示 (Observatory Visual + Interactive Radar)
   ==================================================================== */
.observatory-banner-box {
  margin-top: 3.5rem;
  background: linear-gradient(135deg, rgba(16, 26, 52, 0.85) 0%, rgba(11, 17, 34, 0.95) 100%);
  border: 1px solid rgba(56, 189, 248, 0.32);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  align-items: center;
  box-shadow: var(--shadow-card);
}

.observatory-visual-pane {
  position: relative;
  height: 100%;
  min-height: 380px;
}

.observatory-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.observatory-info-pane {
  padding: 3rem;
  display: flex;
  flex-direction: column;
}

.observatory-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-pure);
  margin-bottom: 0.85rem;
}

.observatory-desc {
  font-size: 1rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

.node-hud-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 2rem;
}

.node-pill {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.node-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--astral-emerald);
  box-shadow: 0 0 6px var(--astral-emerald);
}

/* ====================================================================
   使用场景卡 Scenarios (3张)
   ==================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 2.25rem 1.85rem;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
  position: relative;
}

.scenario-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(168, 85, 247, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.7), 0 0 25px rgba(168, 85, 247, 0.2);
}

.scenario-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.15rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-glass);
}

.scenario-tag {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--astral-cyan);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.scenario-devices {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.scenario-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-pure);
}

.scenario-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-sub);
}

/* ====================================================================
   网络生态 (流媒体 & AI 生产力卡片)
   ==================================================================== */
.network-spec-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.25rem;
}

.spec-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.spec-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--grad-primary);
}

.spec-box-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.85rem;
  color: var(--text-pure);
}

.spec-pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.5rem 0;
}

.spec-pill {
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--text-main);
  transition: all 0.2s ease;
}

.spec-pill:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--astral-cyan);
  color: var(--text-pure);
}

.spec-desc-sub {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ====================================================================
   定价方案 Pricing (高转化切换卡片 + 推荐档高光)
   ==================================================================== */
.pricing-billing-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin: 0 auto 3rem;
  background: rgba(16, 26, 52, 0.85);
  padding: 0.4rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glass);
  width: fit-content;
}

.billing-tab-btn {
  background: none;
  border: none;
  color: var(--text-sub);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.5rem 1.35rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.billing-tab-btn.active {
  background: var(--grad-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.billing-save-tag {
  font-size: 0.72rem;
  padding: 0.1rem 0.45rem;
  background: var(--astral-sakura);
  color: #ffffff;
  border-radius: var(--radius-full);
  margin-left: 0.35rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.75rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 25px 50px -10px rgba(0, 0, 0, 0.8), 0 0 30px rgba(56, 189, 248, 0.2);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(22, 36, 76, 0.85) 0%, rgba(13, 20, 42, 0.95) 100%);
  border-color: rgba(56, 189, 248, 0.65);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 35px rgba(56, 189, 248, 0.35);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-5px);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--grad-primary);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 0.25rem 1.1rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.pricing-tier-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-pure);
  margin-bottom: 0.35rem;
}

.pricing-target {
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 1.5rem;
}

.pricing-price-box {
  margin-bottom: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-glass);
}

.pricing-currency {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--astral-cyan);
}

.pricing-amount {
  font-family: var(--font-mono);
  font-size: 3.1rem;
  font-weight: 800;
  color: var(--text-pure);
  line-height: 1;
}

.pricing-period {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.pricing-features-list {
  list-style: none;
  padding: 0;
  margin: 0 0 2.25rem 0;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 0.9rem;
}

.check-icon {
  width: 18px;
  height: 18px;
  stroke: var(--astral-cyan);
  flex-shrink: 0;
  margin-top: 3px;
  filter: drop-shadow(0 0 6px var(--astral-cyan));
}

.pricing-card .btn-primary,
.pricing-card .btn-secondary {
  width: 100%;
}

/* ====================================================================
   常见问题手风琴 FAQ
   ==================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: all 0.2s ease;
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.35);
}

.faq-question {
  width: 100%;
  padding: 1.35rem 1.6rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-pure);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: color 0.2s ease;
}

.faq-toggle-icon {
  width: 22px;
  height: 22px;
  stroke: var(--astral-sky);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  flex-shrink: 0;
}

.faq-item.active {
  border-color: rgba(56, 189, 248, 0.6);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(180deg);
  stroke: var(--astral-cyan);
}

.faq-answer {
  display: none;
  padding: 0 1.6rem 1.5rem;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-sub);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 1rem;
}

.faq-item.active .faq-answer {
  display: block;
  animation: answer-fade 0.25s ease;
}

@keyframes answer-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ====================================================================
   Final CTA 转化闭环 (天体星核收口)
   ==================================================================== */
.final-cta-section {
  position: relative;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.22) 0%, rgba(7, 10, 20, 0.98) 75%);
  border-top: 1px solid rgba(56, 189, 248, 0.25);
  border-bottom: 1px solid var(--border-glass);
  padding: 6.5rem 0;
  text-align: center;
  overflow: hidden;
}

.final-cta-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  pointer-events: none;
}

.final-cta-title {
  font-size: 2.85rem;
  font-weight: 800;
  margin-bottom: 1.15rem;
  background: var(--grad-text-holo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.final-cta-desc {
  font-size: 1.15rem;
  color: var(--text-sub);
  max-width: 660px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.final-cta-action {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* ====================================================================
   页脚 Footer
   ==================================================================== */
.site-footer {
  background-color: #060912;
  border-top: 1px solid var(--border-glass);
  padding: 4.5rem 0 2.5rem;
  font-size: 0.92rem;
  position: relative;
  z-index: 2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col-brand .footer-brand-title {
  font-size: 1.35rem;
  font-weight: 800;
  background: var(--grad-text-holo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.85rem;
}

.footer-col-brand .footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.68;
  max-width: 340px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 1.25rem;
  border-left: 2px solid var(--astral-cyan);
  padding-left: 0.6rem;
}

.footer-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav-item {
  margin-bottom: 0.75rem;
}

.footer-nav-link {
  color: var(--text-sub);
  font-size: 0.92rem;
}

.footer-nav-link:hover {
  color: var(--astral-cyan);
}

.footer-bottom-bar {
  padding-top: 2rem;
  border-top: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-legal-note {
  line-height: 1.6;
  max-width: 680px;
}

/* ====================================================================
   移动端吸底 CTA 栏 (Mobile Sticky Bar)
   ==================================================================== */
.mobile-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(11, 17, 34, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(56, 189, 248, 0.35);
  padding: 0.75rem 1.2rem;
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.6);
}

.mobile-sticky-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
}

.mobile-cta-info {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.mobile-avatar-tiny {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--astral-cyan);
  object-fit: cover;
  flex-shrink: 0;
}

.mobile-cta-text {
  font-size: 0.9rem;
  color: var(--text-pure);
  font-weight: 700;
  line-height: 1.25;
}

.mobile-cta-sub {
  font-size: 0.75rem;
  color: var(--astral-cyan);
}

.mobile-sticky-btn {
  padding: 0.65rem 1.35rem;
  font-size: 0.92rem;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ====================================================================
   文章正文与指南专用阅读排版 (Dark Glass Reader)
   ==================================================================== */
.article-page-header {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 2.75rem;
}

.article-breadcrumb {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.article-page-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.15rem;
  background: var(--grad-text-holo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.88rem;
  color: var(--text-sub);
  flex-wrap: wrap;
}

.article-content {
  font-size: 1.08rem;
  line-height: 1.88;
  color: var(--text-main);
}

.article-content h2 {
  font-size: 1.75rem;
  margin: 3rem 0 1.15rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-glass);
  color: var(--text-pure);
}

.article-content h3 {
  font-size: 1.35rem;
  margin: 2rem 0 0.85rem;
  color: var(--astral-sky);
}

.article-content p {
  margin-bottom: 1.35rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.6rem;
  padding-left: 1.6rem;
}

.article-content li {
  margin-bottom: 0.55rem;
}

.article-callout {
  background: rgba(16, 26, 52, 0.75);
  border-left: 4px solid var(--astral-cyan);
  padding: 1.35rem 1.65rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 1rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.article-callout p:last-child {
  margin-bottom: 0;
}

.article-table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  text-align: left;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 1.2rem;
  border: 1px solid var(--border-glass);
}

.comparison-table th {
  background: rgba(22, 36, 72, 0.9);
  color: var(--astral-cyan);
  font-weight: 700;
}

.comparison-table tr:hover td {
  background: rgba(255, 255, 255, 0.04);
}

.article-end-cta {
  background: linear-gradient(135deg, rgba(20, 32, 64, 0.85) 0%, rgba(10, 16, 34, 0.95) 100%);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-lg);
  padding: 2.75rem 2rem;
  text-align: center;
  margin: 4rem 0;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(56, 189, 248, 0.2);
}

.article-end-cta-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 0.85rem;
  color: var(--text-pure);
}

.article-end-cta-desc {
  font-size: 1rem;
  color: var(--text-sub);
  max-width: 560px;
  margin: 0 auto 1.75rem;
}

.related-articles-box {
  margin: 3.5rem 0;
  padding-top: 2.25rem;
  border-top: 1px solid var(--border-glass);
}

.related-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-pure);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.related-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  transition: all 0.2s ease;
}

.related-card:hover {
  border-color: var(--astral-sky);
  background: var(--bg-card-hover);
  text-decoration: none;
  transform: translateY(-2px);
}

.related-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 0.45rem;
}

.related-card-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* 指南列表页网格 */
.guides-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin: 3rem 0;
}

.guide-summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  transition: all 0.25s ease;
}

.guide-summary-card:hover {
  border-color: var(--astral-sky);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6), 0 0 25px rgba(56, 189, 248, 0.2);
}

.guide-card-meta {
  font-size: 0.82rem;
  color: var(--astral-cyan);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.guide-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.guide-card-title a {
  color: var(--text-pure);
}

.guide-card-title a:hover {
  color: var(--astral-cyan);
}

.guide-card-excerpt {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.68;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.guide-card-thumb {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--astral-cyan);
  margin-bottom: 1.25rem;
  transition: all 0.25s ease;
}

.guide-summary-card:hover .guide-card-thumb {
  background: rgba(0, 240, 255, 0.16);
  border-color: var(--astral-cyan);
  transform: scale(1.05);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.35);
}

.guide-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-glass);
}

.guide-card-reading-time {
  color: var(--astral-sky);
  font-weight: 500;
}

.guide-read-more-link {
  color: var(--astral-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.guide-read-more-link:hover {
  text-decoration: underline;
  color: #fff;
}

/* 法律声明卡片 */
.legal-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 3rem;
  margin: 3rem 0;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}

.legal-content-box h2 {
  font-size: 1.45rem;
  margin: 2.25rem 0 0.85rem;
  color: var(--astral-cyan);
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 0.4rem;
}

.legal-content-box h2:first-of-type {
  margin-top: 0;
}

.legal-content-box p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-main);
}

.legal-content-box ul {
  padding-left: 1.5rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-main);
}

/* 网站地图 */
.sitemap-group {
  margin-bottom: 3rem;
}

.sitemap-group-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-glass);
  color: var(--astral-cyan);
}

.sitemap-links-list {
  list-style: none;
  padding: 0;
}

.sitemap-links-list li {
  margin-bottom: 0.95rem;
}

.sitemap-link-item {
  display: flex;
  align-items: baseline;
  gap: 1.15rem;
}

.sitemap-link-item a {
  font-weight: 700;
  font-size: 1.05rem;
}

.sitemap-link-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 动画触发与平滑显现 (Reveal On Scroll) */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ====================================================================
   响应式断点与无障碍适配
   ==================================================================== */
@media (max-width: 1024px) {
  .hero-grid-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }
  .hero-content-col {
    align-items: center;
  }
  .hero-title {
    font-size: 2.6rem;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .telemetry-hud-strip {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
  }
  .observatory-banner-box {
    grid-template-columns: 1fr;
  }
  .observatory-visual-pane {
    min-height: 280px;
  }
  .observatory-info-pane {
    padding: 2rem;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-5px);
  }
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .network-spec-row {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .hero-section {
    padding: 3.5rem 0 2.5rem;
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .telemetry-hud-strip {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
  .character-visual-img {
    height: 400px;
  }
  .section-block {
    padding: 4rem 0;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .menu-toggle {
    display: flex;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: rgba(7, 10, 20, 0.98);
    border-bottom: 1px solid rgba(56, 189, 248, 0.35);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    align-items: flex-start;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.8);
  }
  .site-nav.open {
    display: flex;
  }
  .header-action .btn-nav-cta {
    display: none;
  }
  .guides-list-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .legal-content-box {
    padding: 1.75rem;
  }
  .mobile-sticky-cta {
    display: block;
  }
  body {
    padding-bottom: 74px;
  }
}

/* 尊重用户的动画减弱首选项 */
@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;
  }
  .shooting-star,
  .btn-primary::before,
  .astral-rune-ring,
  .astral-middle-ring,
  .character-visual-img {
    animation: none !important;
  }
}