/* ====================================================================
   飞兔云 — 视觉与交互设计系统 (style.css)
   设计主题：【神隐月华 · 幽夜灵狐与破晓符阵 (Tsukuyomi Kagura)】
   设计语言：幽夜秘境底色 · 灵狐巫女立绘 · 浮空全息符文阵 · 磨砂水晶玻璃态 · 高转化发光组件
   特性：原生 CSS/SVG / 零外部CDN依赖 / 系统字体栈 / 移动端触控优化 / prefers-reduced-motion 适配
   ==================================================================== */

:root {
  /* 幽夜秘境核心色板 */
  --bg-midnight: #070b16;
  --bg-deep: #0c1224;
  --bg-surface: rgba(14, 22, 42, 0.78);
  --bg-surface-elevated: rgba(20, 32, 60, 0.92);
  --bg-card: rgba(15, 25, 48, 0.72);
  --bg-card-hover: rgba(26, 42, 78, 0.88);
  --bg-glass: rgba(255, 255, 255, 0.04);

  /* 文字对比度层级 (满足 WCAG 4.5:1 无障碍要求) */
  --text-pure: #ffffff;
  --text-main: #f1f5f9;
  --text-sub: #cbd5e1;
  --text-muted: #8497ad;
  --text-dim: #64748b;

  /* 灵狐与月华魔法色 */
  --neon-cyan: #38bdf8;
  --neon-cyan-glow: rgba(56, 189, 248, 0.35);
  --neon-purple: #818cf8;
  --neon-violet: #a855f7;
  --neon-violet-glow: rgba(168, 85, 247, 0.32);
  --neon-gold: #fbbf24;
  --neon-gold-glow: rgba(251, 191, 36, 0.35);
  --neon-rose: #f43f5e;
  --neon-rose-glow: rgba(244, 63, 94, 0.35);
  --neon-emerald: #10b981;

  /* 边框体系 */
  --border-subtle: rgba(148, 163, 184, 0.16);
  --border-glass: rgba(56, 189, 248, 0.22);
  --border-glow: rgba(56, 189, 248, 0.55);
  --border-active: rgba(129, 140, 248, 0.85);

  /* 渐变材质 */
  --grad-aurora: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #f43f5e 100%);
  --grad-cyan-purple: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  --grad-gold-amber: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  --grad-btn-primary: linear-gradient(135deg, #2563eb 0%, #6366f1 50%, #a855f7 100%);
  --grad-btn-hover: linear-gradient(135deg, #3b82f6 0%, #818cf8 50%, #c084fc 100%);

  /* 字体系统 (系统字体栈，禁止中文字体下载) */
  --font-system: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 布局与圆角 */
  --container-max: 1180px;
  --header-height: 72px;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* 动效过渡 */
  --transition-smooth: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.18s ease;
}

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

html {
  font-family: var(--font-system);
  background-color: var(--bg-midnight);
  color: var(--text-main);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-midnight);
  color: var(--text-main);
  font-size: 16px;
  overflow-x: hidden;
  position: relative;
  padding-bottom: 76px;
}

@media (min-width: 900px) {
  body {
    padding-bottom: 0;
  }
}

a {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

a:hover {
  color: #ffffff;
  text-shadow: 0 0 10px var(--neon-cyan-glow);
}

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

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ====================================================================
   动态背景层：幽夜星曜晶石与月华狐火
   ==================================================================== */
.ambient-scene-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-nebula {
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background:
    radial-gradient(circle at 18% 18%, rgba(56, 189, 248, 0.12) 0%, transparent 48%),
    radial-gradient(circle at 82% 24%, rgba(168, 85, 247, 0.12) 0%, transparent 52%),
    radial-gradient(circle at 50% 85%, rgba(244, 63, 94, 0.08) 0%, transparent 58%),
    linear-gradient(180deg, var(--bg-midnight) 0%, var(--bg-deep) 100%);
  filter: blur(40px);
}

.crystal-sparkle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 0 8px #ffffff, 0 0 16px var(--neon-cyan);
  animation: crystalTwinkle 4s ease-in-out infinite alternate;
}

.foxfire-flame {
  position: absolute;
  width: 8px;
  height: 14px;
  background: radial-gradient(ellipse at bottom, rgba(56, 189, 248, 0.8) 0%, rgba(129, 140, 248, 0.5) 50%, transparent 80%);
  border-radius: 50% 50% 30% 30%;
  filter: blur(1.5px);
  animation: foxfireFloat 7s ease-in-out infinite;
}

@keyframes crystalTwinkle {
  0% { opacity: 0.15; transform: scale(0.7); }
  100% { opacity: 0.95; transform: scale(1.4); }
}

@keyframes foxfireFloat {
  0% { transform: translateY(0) scale(0.9); opacity: 0; }
  25% { opacity: 0.7; }
  75% { opacity: 0.8; }
  100% { transform: translateY(-120px) scale(1.2); opacity: 0; }
}

/* ====================================================================
   头部导航 HEADER
   ==================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(7, 11, 22, 0.84);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glass);
  transition: all var(--transition-smooth);
}

.site-header.scrolled {
  background-color: rgba(7, 11, 22, 0.96);
  border-bottom-color: var(--border-glow);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.55);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--text-pure);
  letter-spacing: -0.01em;
  position: relative;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 0 10px var(--neon-cyan-glow));
}

.brand-name-box {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.18rem;
  font-weight: 800;
  background: linear-gradient(90deg, #ffffff 30%, var(--neon-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tag {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--neon-purple);
  letter-spacing: 0.08em;
  line-height: 1;
}

.nav-menu {
  display: none;
  list-style: none;
  gap: 28px;
  align-items: center;
}

@media (min-width: 960px) {
  .nav-menu {
    display: flex;
  }
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-sub);
  padding: 6px 0;
  position: relative;
  letter-spacing: 0.02em;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-aurora);
  border-radius: var(--radius-full);
  transition: width var(--transition-smooth);
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

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

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

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 8px;
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

@media (min-width: 960px) {
  .menu-toggle {
    display: none;
  }
}

/* 移动端菜单抽屉 */
.mobile-nav-panel {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: rgba(7, 11, 22, 0.98);
  border-bottom: 1px solid var(--border-glow);
  padding: 24px;
  z-index: 999;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
}

.mobile-nav-panel.is-open {
  display: block;
}

.mobile-menu-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 22px;
}

.mobile-menu-item a {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-pure);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-subtle);
}

/* ====================================================================
   CTA 按钮系统 (商业转化高强度发光与流光扫过)
   ==================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.96rem;
  font-weight: 700;
  padding: 12px 26px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1.4;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.02em;
  transition: all var(--transition-smooth);
}

.btn-primary {
  background: var(--grad-btn-primary);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.45), 0 0 0 1px rgba(56, 189, 248, 0.3);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -60%;
  width: 40%;
  height: 200%;
  background: linear-gradient(60deg, transparent 0%, rgba(255, 255, 255, 0.4) 50%, transparent 100%);
  transform: rotate(25deg);
  animation: btnShimmer 4.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  pointer-events: none;
}

@keyframes btnShimmer {
  0% { left: -60%; }
  20% { left: 140%; }
  100% { left: 140%; }
}

.btn-primary:hover {
  background: var(--grad-btn-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(99, 102, 241, 0.65), 0 0 18px var(--neon-cyan-glow);
}

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

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border-color: var(--border-glass);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background-color: rgba(56, 189, 248, 0.12);
  border-color: var(--neon-cyan);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 18px rgba(56, 189, 248, 0.2);
}

.btn-block {
  width: 100%;
}

/* 按钮点击触觉水波纹 */
.click-ripple {
  position: absolute;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  transform: scale(0);
  animation: rippleSpread 0.6s linear;
  pointer-events: none;
}

@keyframes rippleSpread {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ====================================================================
   HERO 区块（动漫主视觉核心与灵狐立绘）
   ==================================================================== */
.hero-section {
  position: relative;
  padding: 48px 0 64px;
  background: transparent;
  overflow: hidden;
}

@media (min-width: 960px) {
  .hero-section {
    padding: 72px 0 96px;
  }
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

@media (min-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
  }
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--neon-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
  letter-spacing: 0.05em;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.15);
}

.hero-title {
  font-size: 2.2rem;
  line-height: 1.24;
  font-weight: 800;
  color: var(--text-pure);
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3.1rem;
  }
}

.hero-title-highlight {
  background: var(--grad-aurora);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--text-sub);
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-trust-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-sub);
}

.trust-item svg {
  color: var(--neon-cyan);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ====================================================================
   HERO 右侧：灵狐巫女立绘展台与互动式魔导信标
   ==================================================================== */
.hero-mascot-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  perspective: 1200px;
}

/* 角色立绘核心卡片 */
.anime-mascot-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 30px rgba(56, 189, 248, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
  cursor: pointer;
}

.anime-mascot-card:hover {
  border-color: var(--border-glow);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 45px rgba(56, 189, 248, 0.35);
}

/* 角色立绘后方全息旋转法阵 (Rune Rings) */
.mascot-rune-ring {
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 380px;
  height: 380px;
  border-radius: 50%;
  border: 1.5px dashed rgba(56, 189, 248, 0.35);
  pointer-events: none;
  animation: runeSpinCW 36s linear infinite;
  box-shadow: 0 0 30px rgba(129, 140, 248, 0.18), inset 0 0 30px rgba(56, 189, 248, 0.15);
}

.mascot-rune-ring::before {
  content: '';
  position: absolute;
  inset: 22px;
  border-radius: 50%;
  border: 1px solid rgba(168, 85, 247, 0.4);
  border-style: double;
  border-width: 3px;
  animation: runeSpinCCW 24s linear infinite;
}

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

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

/* 立绘图容器与浮动动画 */
.mascot-img-wrap {
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: radial-gradient(circle at 50% 40%, rgba(99, 102, 241, 0.25) 0%, rgba(7, 11, 22, 0.8) 80%);
  animation: mascotLevitate 6s ease-in-out infinite;
}

.mascot-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.5));
  transition: transform 0.4s ease;
}

@keyframes mascotLevitate {
  0% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
  100% { transform: translateY(0); }
}

/* 顶部与底部 HUD 徽章 */
.mascot-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-pure);
}

.mascot-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.mascot-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #34d399;
  box-shadow: 0 0 8px #34d399;
}

/* 灵狐互动语音与对话气泡 CARD */
.anime-dialogue-card {
  width: 100%;
  max-width: 440px;
  margin-top: 14px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-glass);
  border-left: 4px solid var(--neon-cyan);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-smooth);
}

.anime-dialogue-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.dialogue-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.dialogue-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 12px var(--neon-cyan-glow);
  object-fit: cover;
  flex-shrink: 0;
}

.dialogue-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-pure);
  display: flex;
  align-items: center;
  gap: 6px;
}

.dialogue-role {
  font-size: 0.78rem;
  color: var(--neon-cyan);
  display: block;
}

.dialogue-bubble {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  position: relative;
  cursor: pointer;
  user-select: none;
  transition: background-color var(--transition-fast);
}

.dialogue-bubble:hover {
  background: rgba(56, 189, 248, 0.08);
  border-color: var(--border-glass);
}

.dialogue-hint {
  display: block;
  margin-top: 6px;
  font-size: 0.76rem;
  color: var(--neon-purple);
  text-align: right;
  font-family: var(--font-mono);
}

/* 4大网络性能晶柱指标 (Metric Pills) */
.hero-metrics-deck {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
  max-width: 440px;
  margin-top: 14px;
}

.metric-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.metric-pill-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-sub);
  margin-bottom: 3px;
}

.metric-pill-value {
  display: block;
  font-size: 1.15rem;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

/* ====================================================================
   通用板块排版规范
   ==================================================================== */
.section {
  position: relative;
  padding: 72px 0;
  z-index: 2;
}

@media (min-width: 960px) {
  .section {
    padding: 88px 0;
  }
}

.section-alt {
  background-color: rgba(12, 18, 36, 0.6);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 48px;
  max-width: 720px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--neon-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.28);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-pure);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.35rem;
  }
}

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

/* ====================================================================
   1. 功能特性网格 FEATURES (4张卡)
   ==================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-aurora);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6), 0 0 24px var(--neon-cyan-glow);
}

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

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.14);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--neon-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--text-sub);
}

/* ====================================================================
   2. 流媒体支持 STREAMING & 5. AI 工具支持 (App Grid)
   ==================================================================== */
.app-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 600px) {
  .app-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .app-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.app-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth);
}

.app-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5), 0 0 20px rgba(56, 189, 248, 0.2);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.app-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-pure);
}

.app-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--neon-cyan);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 3px 9px;
  border-radius: var(--radius-full);
}

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

/* ====================================================================
   3. 使用场景卡 SCENARIOS (替代虚假评价)
   ==================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.scenario-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 26px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth);
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.scenario-header {
  margin-bottom: 14px;
}

.scenario-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-pure);
  margin-bottom: 8px;
}

.scenario-device {
  display: inline-block;
  font-size: 0.84rem;
  color: var(--neon-cyan);
  font-weight: 600;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.scenario-desc {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--text-sub);
}

/* ====================================================================
   4. 定价模块 PRICING (带交互式计费周期切换)
   ==================================================================== */
.pricing-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
}

.pricing-tab-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-glass);
  color: var(--text-sub);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pricing-tab-btn.active {
  background: var(--neon-cyan);
  color: var(--bg-midnight);
  border-color: var(--neon-cyan);
  font-weight: 800;
  box-shadow: 0 0 18px var(--neon-cyan-glow);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: stretch;
}

@media (min-width: 900px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7), 0 0 30px rgba(56, 189, 248, 0.25);
}

/* 推荐档位高亮与灵狐特选徽章 */
.pricing-card-recommended {
  border: 2px solid var(--neon-cyan);
  background: linear-gradient(180deg, rgba(20, 34, 66, 0.88) 0%, rgba(14, 22, 42, 0.95) 100%);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 35px var(--neon-cyan-glow);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--grad-btn-primary);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.6);
  white-space: nowrap;
}

.pricing-tier-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-pure);
  margin-bottom: 8px;
}

.pricing-tier-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 24px;
  min-height: 44px;
  line-height: 1.6;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--neon-cyan);
}

.pricing-amount {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1;
  color: #ffffff;
  font-family: var(--font-mono);
  margin: 0 6px;
}

.pricing-period {
  font-size: 0.98rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-main);
  line-height: 1.55;
}

.pricing-feature-item svg {
  color: var(--neon-cyan);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ====================================================================
   6. 常见问题 FAQ (抽屉式平滑折叠)
   ==================================================================== */
.faq-list {
  max-width: 840px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-glow);
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-pure);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-toggle-icon {
  width: 22px;
  height: 22px;
  color: var(--neon-cyan);
  transition: transform var(--transition-smooth);
  flex-shrink: 0;
}

.faq-item[open] .faq-toggle-icon {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 24px 22px;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--text-sub);
  border-top: 1px solid var(--border-subtle);
  margin-top: 4px;
  padding-top: 16px;
}

/* ====================================================================
   FINAL CTA 区块 (沉浸式幽夜神乐殿)
   ==================================================================== */
.final-cta-section {
  position: relative;
  padding: 88px 0;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.22) 0%, rgba(7, 11, 22, 0.95) 80%);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
  text-align: center;
  overflow: hidden;
}

.final-cta-container {
  max-width: 720px;
  position: relative;
  z-index: 2;
}

.final-cta-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .final-cta-title {
    font-size: 2.6rem;
  }
}

.final-cta-desc {
  font-size: 1.12rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 32px;
}

/* ====================================================================
   移动端吸底 CTA
   ==================================================================== */
.sticky-mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(7, 11, 22, 0.96);
  border-top: 1px solid var(--border-glow);
  padding: 12px 20px;
  z-index: 990;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

@media (max-width: 899px) {
  .sticky-mobile-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }
}

.sticky-mobile-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.96rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
}

.sticky-mobile-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--neon-cyan);
  flex-shrink: 0;
}

.sticky-mobile-text span {
  display: block;
  font-size: 0.76rem;
  font-weight: 400;
  color: var(--neon-cyan);
}

/* ====================================================================
   页脚 FOOTER
   ==================================================================== */
.site-footer {
  background-color: rgba(5, 8, 16, 0.95);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 36px;
  font-size: 0.88rem;
  color: var(--text-muted);
  position: relative;
  z-index: 2;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 22px;
}

.footer-nav a {
  color: var(--text-sub);
  font-weight: 600;
}

.footer-nav a:hover {
  color: #ffffff;
}

.footer-disclaimer {
  line-height: 1.65;
  margin-bottom: 16px;
  max-width: 820px;
}

.footer-copyright {
  color: var(--text-dim);
}

/* ====================================================================
   文章页与独立页规范 (Article & Static Pages)
   ==================================================================== */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 44px 20px 68px;
  position: relative;
  z-index: 2;
}

.breadcrumb-nav {
  margin-bottom: 26px;
}

.breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-sub);
}

.breadcrumb-separator {
  color: var(--text-dim);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-glass);
}

.article-title {
  font-size: 2.15rem;
  line-height: 1.3;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--neon-cyan);
}

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

.article-body p {
  margin-bottom: 22px;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  margin-top: 40px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-glass);
}

.article-body h3 {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--neon-cyan);
  margin-top: 28px;
  margin-bottom: 14px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 26px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.28);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  color: var(--neon-cyan);
}

.article-body pre {
  background-color: rgba(7, 11, 22, 0.95);
  border: 1px solid var(--border-glass);
  color: #f8fafc;
  padding: 18px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.55;
}

.article-callout {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-glass);
  border-left: 4px solid var(--neon-cyan);
  border-radius: var(--radius-sm);
  padding: 26px;
  margin: 40px 0;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
}

.article-callout-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 8px;
}

.article-callout-desc {
  font-size: 0.96rem;
  color: var(--text-sub);
  margin-bottom: 20px;
  line-height: 1.65;
}

.article-related-links {
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
}

.article-related-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
}

.article-related-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-related-list a {
  font-weight: 600;
}

/* 指南列表卡片 */
.guides-list-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 640px) {
  .guides-list-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.guide-item-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth);
}

.guide-item-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.55), 0 0 24px var(--neon-cyan-glow);
}

.guide-item-title {
  font-size: 1.22rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
}

.guide-item-desc {
  font-size: 0.94rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.guide-item-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--neon-cyan);
}

/* ====================================================================
   无障碍：减弱运动偏好 (prefers-reduced-motion)
   ==================================================================== */
@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;
  }

  .mascot-rune-ring,
  .crystal-sparkle,
  .foxfire-flame,
  .btn-primary::before,
  .mascot-img-wrap {
    animation: none !important;
  }
}