/* ==========================================================================
   轻语机场 (qingyujc.lol) - 官方网站样式表
   框架编号: 31 森林晨雾 晨雾轻轻飘动 · 纯净白+青(White + Cyan) 3D科技美学
   ========================================================================== */

:root {
  /* 品牌核心色彩 - 白+青 森林晨雾视觉基调 */
  --color-bg-primary: #f6fbf9;
  --color-bg-surface: #ffffff;
  --color-bg-card: rgba(255, 255, 255, 0.92);
  --color-bg-elevated: #ffffff;
  --color-bg-glass: rgba(240, 253, 250, 0.85);
  --color-border: rgba(13, 148, 136, 0.15);
  --color-border-hover: rgba(13, 148, 136, 0.5);

  /* 青色与薄雾绿意 */
  --color-brand-primary: #0d9488;
  --color-brand-secondary: #0f766e;
  --color-brand-mint: #14b8a6;
  --color-brand-glow: #2dd4bf;
  --color-brand-deep: #134e4a;
  --color-brand-accent: #f59e0b;
  --color-brand-cyan: #06b6d4;

  /* 文字高清晰度对比体系 */
  --color-text-title: #0a251e;
  --color-text-main: #1f3f35;
  --color-text-muted: #4e7367;
  --color-text-subtle: #799d91;

  /* 渐变与晨雾效果 */
  --grad-brand: linear-gradient(135deg, #14b8a6 0%, #0d9488 50%, #0f766e 100%);
  --grad-brand-glow: linear-gradient(135deg, #0f766e 0%, #0d9488 50%, #14b8a6 100%);
  --grad-forest: linear-gradient(180deg, #f0fdf9 0%, #e6f7f2 50%, #f8fafc 100%);
  --grad-card-glow: radial-gradient(circle at 50% 0%, rgba(20, 184, 166, 0.12) 0%, transparent 75%);
  --grad-hero: radial-gradient(ellipse 90% 60% at 50% -10%, rgba(45, 212, 191, 0.22), transparent 75%);

  /* 3D阴影与发光 (明朗轻盈) */
  --shadow-sm: 0 4px 12px rgba(13, 148, 136, 0.06);
  --shadow-md: 0 10px 30px rgba(13, 148, 136, 0.08), 0 2px 8px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 20px 50px rgba(13, 148, 136, 0.12), 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 35px rgba(20, 184, 166, 0.2);
  --shadow-glow-strong: 0 0 50px rgba(45, 212, 191, 0.35);

  /* 字体排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* 尺寸与间距 */
  --max-width: 1220px;
  --nav-height: 74px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --radius-full: 9999px;

  /* 动效过渡 */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  width: 100%;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  width: 100%;
  background: var(--color-bg-primary);
  line-height: 1.65;
}

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ==========================================================================
   顶部导航栏
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px rgba(13, 148, 136, 0.08);
  border-bottom-color: rgba(13, 148, 136, 0.25);
}

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

/* 品牌LOGO */
.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  perspective: 600px;
}

.logo-badge-3d {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(204, 251, 241, 0.8) 0%, rgba(20, 184, 166, 0.18) 100%);
  border: 1px solid rgba(13, 148, 136, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(13, 148, 136, 0.12);
  transform-style: preserve-3d;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  animation: logoFloat 4s ease-in-out infinite;
}

.brand-logo-link:hover .logo-badge-3d {
  transform: rotateY(18deg) rotateX(10deg) scale(1.08);
  box-shadow: 0 8px 24px rgba(20, 184, 166, 0.35);
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-title);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-name .highlight {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-slogan-tiny {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 8px 4px;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--grad-brand);
  transition: width var(--transition-normal);
  border-radius: 2px;
}

.nav-link:hover {
  color: var(--color-brand-primary);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-brand-secondary);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
  background: rgba(20, 184, 166, 0.08);
}

/* ==========================================================================
   按钮组件系统 (统一主要按钮文案: 立即前往注册)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.96rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--grad-brand);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(13, 148, 136, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(20, 184, 166, 0.45);
  background: linear-gradient(135deg, #0d9488 0%, #14b8a6 100%);
  color: #ffffff;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(20, 184, 166, 0.08);
  color: var(--color-brand-secondary);
  border: 1px solid rgba(13, 148, 136, 0.25);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(20, 184, 166, 0.16);
  border-color: rgba(13, 148, 136, 0.45);
  color: var(--color-brand-primary);
  transform: translateY(-2px);
}

.btn-large {
  padding: 15px 32px;
  font-size: 1.05rem;
}

.btn-pulse {
  position: relative;
  overflow: hidden;
}

.btn-pulse::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.35) 0%, transparent 60%);
  opacity: 0;
  transform: scale(0.5);
  transition: opacity 0.4s, transform 0.4s;
}

.btn-pulse:hover::before {
  opacity: 1;
  transform: scale(1);
}

/* ==========================================================================
   框架 31 森林晨雾核心效果 (白+青 白雾与视差流层)
   ========================================================================== */
.forest-mist-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
  background: radial-gradient(ellipse 90% 60% at 50% -10%, rgba(204, 251, 241, 0.45), transparent 75%);
}

/* 晨雾飘动画布与多层波纹 */
.mist-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.7;
}

.mist-drift-layer {
  position: absolute;
  width: 200%;
  height: 100%;
  left: -50%;
  top: 0;
  pointer-events: none;
}

.mist-drift-1 {
  background: radial-gradient(ellipse 65% 35% at 30% 25%, rgba(204, 251, 241, 0.6) 0%, transparent 70%),
              radial-gradient(ellipse 70% 40% at 75% 65%, rgba(45, 212, 191, 0.15) 0%, transparent 70%);
  animation: mistDriftSlow 32s ease-in-out infinite alternate;
  filter: blur(40px);
}

.mist-drift-2 {
  background: radial-gradient(ellipse 80% 40% at 60% 40%, rgba(255, 255, 255, 0.8) 0%, transparent 75%),
              radial-gradient(ellipse 55% 30% at 20% 80%, rgba(204, 251, 241, 0.5) 0%, transparent 70%);
  animation: mistDriftReverse 45s ease-in-out infinite alternate;
  filter: blur(50px);
}

.forest-light-rays {
  position: absolute;
  top: -10%;
  left: 15%;
  width: 70%;
  height: 120%;
  background: conic-gradient(from 135deg at 50% 0%, 
              transparent 0deg, 
              rgba(45, 212, 191, 0.08) 15deg, 
              transparent 30deg, 
              rgba(245, 158, 11, 0.05) 45deg, 
              transparent 60deg);
  opacity: 0.8;
  pointer-events: none;
  animation: rayGleam 18s ease-in-out infinite alternate;
}

/* ==========================================================================
   Hero 首屏设计 (框架31 + 3D 视觉主体)
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + 50px);
  padding-bottom: 70px;
  display: flex;
  align-items: center;
  z-index: 2;
  overflow: hidden;
}

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

.hero-content {
  position: relative;
  z-index: 3;
}

.framework-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(20, 184, 166, 0.1);
  border: 1px solid rgba(13, 148, 136, 0.25);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-brand-primary);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
  animation: badgePulse 3s ease-in-out infinite;
  max-width: 100%;
  box-sizing: border-box;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #14b8a6;
  box-shadow: 0 0 10px #14b8a6;
}

.hero-title {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-title);
  margin-bottom: 22px;
  word-break: break-word;
  overflow-wrap: break-word;
}

.hero-title-highlight {
  display: block;
  background: linear-gradient(135deg, #0f766e 0%, #0d9488 50%, #14b8a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  word-break: break-word;
  overflow-wrap: break-word;
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: 34px;
  max-width: 580px;
}

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

.hero-features-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 26px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--color-text-title);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.stat-value .unit {
  font-size: 0.95rem;
  color: var(--color-brand-primary);
  margin-left: 2px;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ==========================================================================
   3D 视觉主体 (森林晨雾立体青玉晶体与科技环)
   ========================================================================== */
.hero-3d-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1200px;
  min-height: 480px;
}

.sphere-stage-3d {
  position: relative;
  width: 380px;
  height: 380px;
  transform-style: preserve-3d;
  animation: sphereFloat 6s ease-in-out infinite;
}

.crystal-core-sphere {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 220px;
  height: 220px;
  margin-top: -110px;
  margin-left: -110px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ffffff 0%, #5eead4 30%, #0d9488 75%, #0f766e 100%);
  box-shadow: 0 10px 45px rgba(13, 148, 136, 0.28), inset 0 0 35px rgba(255, 255, 255, 0.85);
  filter: drop-shadow(0 15px 30px rgba(13, 148, 136, 0.18));
  transform-style: preserve-3d;
  transition: transform 0.2s ease-out;
}

.crystal-mist-aura {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 320px;
  height: 320px;
  margin-top: -160px;
  margin-left: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 234, 212, 0.4) 0%, rgba(20, 184, 166, 0.12) 50%, transparent 70%);
  animation: auraBreathe 5s ease-in-out infinite;
  pointer-events: none;
}

/* 3D 旋转轨道环 */
.orbit-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  border: 1.5px dashed rgba(13, 148, 136, 0.45);
  transform-style: preserve-3d;
  pointer-events: none;
}

.orbit-ring-1 {
  width: 310px;
  height: 310px;
  margin-top: -155px;
  margin-left: -155px;
  transform: rotateX(65deg) rotateY(20deg);
  animation: orbitSpin 16s linear infinite;
}

.orbit-ring-2 {
  width: 360px;
  height: 360px;
  margin-top: -180px;
  margin-left: -180px;
  border: 1px solid rgba(45, 212, 191, 0.4);
  transform: rotateX(-50deg) rotateY(40deg);
  animation: orbitSpinReverse 22s linear infinite;
}

/* 3D 浮动节点微卡片 (纯白质感) */
.floating-tech-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(13, 148, 136, 0.25);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(14px);
  box-shadow: 0 8px 24px rgba(13, 148, 136, 0.12);
  transform-style: preserve-3d;
  transition: transform 0.3s ease;
}

.floating-tech-card:hover {
  transform: scale(1.06) translateZ(20px);
  border-color: rgba(13, 148, 136, 0.6);
}

.ftc-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(20, 184, 166, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-brand-primary);
}

.ftc-text {
  display: flex;
  flex-direction: column;
}

.ftc-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-text-title);
}

.ftc-desc {
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

.ftc-1 {
  top: 15px;
  right: -10px;
  animation: cardFloatA 5s ease-in-out infinite;
}

.ftc-2 {
  bottom: 25px;
  left: -10px;
  animation: cardFloatB 6s ease-in-out infinite;
}

/* ==========================================================================
   通用区块排版
   ========================================================================== */
.section {
  position: relative;
  padding: 100px 0;
  z-index: 2;
}

.section-dark {
  background: rgba(240, 253, 250, 0.65);
  backdrop-filter: blur(8px);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-brand-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--color-text-title);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   核心功能介绍 (6大优势卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card-3d {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transform-style: preserve-3d;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s, box-shadow 0.3s;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(13, 148, 136, 0.05);
}

.feature-card-3d::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-brand-mint), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.feature-card-3d:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: 0 16px 36px rgba(13, 148, 136, 0.12), var(--shadow-glow);
}

.feature-card-3d:hover::before {
  opacity: 1;
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(204, 251, 241, 0.8) 0%, rgba(20, 184, 166, 0.15) 100%);
  border: 1px solid rgba(13, 148, 136, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-brand-primary);
  margin-bottom: 22px;
  box-shadow: 0 4px 15px rgba(13, 148, 136, 0.08);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 12px;
}

.feature-card-desc {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* ==========================================================================
   套餐价格展示 (严格对应截图: 白色卡片 + 青色网格背景 PLAN 01/02/03)
   ========================================================================== */
.pricing-section {
  position: relative;
  padding: 110px 0;
  z-index: 2;
}

.pricing-header-lead {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.pricing-sub-note {
  font-size: 0.95rem;
  color: var(--color-text-subtle);
  margin-top: 8px;
}

/* 周期切换按钮栏 */
.cycle-switcher-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 48px;
}

.cycle-switcher {
  display: inline-flex;
  background: #ffffff;
  padding: 5px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 10px rgba(13, 148, 136, 0.08);
}

.cycle-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
}

.cycle-btn.active {
  background: var(--grad-brand);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 2px 12px rgba(13, 148, 136, 0.25);
}

.cycle-badge {
  font-size: 0.72rem;
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* 套餐网格与卡片 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  perspective: 1200px;
}

.pricing-card-3d {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform-style: preserve-3d;
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
  box-shadow: 0 6px 24px rgba(13, 148, 136, 0.06);
  background-image: linear-gradient(rgba(13, 148, 136, 0.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(13, 148, 136, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}

.pricing-card-3d:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-8px) rotateX(2deg);
  box-shadow: 0 18px 45px rgba(13, 148, 136, 0.12), var(--shadow-glow);
}

/* 推荐套餐 PLAN 02 高亮 (多方选择) */
.pricing-card-3d.is-featured {
  border: 2px solid #0d9488;
  background: #ffffff;
  box-shadow: 0 12px 35px rgba(13, 148, 136, 0.14), 0 0 25px rgba(45, 212, 191, 0.25);
  transform: scale(1.03);
}

.pricing-card-3d.is-featured:hover {
  transform: scale(1.04) translateY(-8px) rotateX(2deg);
  box-shadow: 0 20px 50px rgba(13, 148, 136, 0.2), var(--shadow-glow-strong);
}

.pricing-badge-recommend {
  position: absolute;
  top: 24px;
  right: 24px;
  background: var(--grad-brand);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 10px rgba(13, 148, 136, 0.3);
  letter-spacing: 0.05em;
}

.plan-code-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
  letter-spacing: 0.1em;
}

.plan-name {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--color-text-title);
  margin-bottom: 6px;
}

.plan-slogan {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  min-height: 24px;
}

/* 核心特性清单 */
.plan-features-list {
  list-style: none;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--color-text-main);
  margin-bottom: 14px;
}

.plan-feature-item svg {
  flex-shrink: 0;
  color: var(--color-brand-primary);
}

.plan-price-block {
  margin-bottom: 24px;
}

.price-currency {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-text-title);
}

.price-num {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-text-title);
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
}

.price-cycle {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-left: 4px;
}

.plan-action-btn {
  width: 100%;
}

/* ==========================================================================
   使用场景与多设备支持
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.scenario-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 16px rgba(13, 148, 136, 0.05);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.scenario-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow: 0 12px 28px rgba(13, 148, 136, 0.1);
}

.scenario-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.scenario-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 8px;
}

.scenario-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 快速配置步骤 */
.steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.step-card {
  background: #ffffff;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
  box-shadow: 0 4px 16px rgba(13, 148, 136, 0.04);
}

.step-number {
  position: absolute;
  top: 18px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 900;
  color: rgba(13, 148, 136, 0.12);
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   原创知识文章入口区块
   ========================================================================== */
.articles-section {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}

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

.article-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(14px);
  box-shadow: 0 4px 18px rgba(13, 148, 136, 0.05);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-border-hover);
  box-shadow: 0 16px 36px rgba(13, 148, 136, 0.12), var(--shadow-glow);
}

.article-tag {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(20, 184, 166, 0.1);
  color: var(--color-brand-primary);
  margin-bottom: 14px;
  width: fit-content;
}

.article-card-title {
  font-size: 1.16rem;
  font-weight: 700;
  color: var(--color-text-title);
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
  font-size: 0.82rem;
  color: var(--color-text-subtle);
}

.article-read-link {
  color: var(--color-brand-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-link:hover {
  color: var(--color-brand-secondary);
}

/* ==========================================================================
   真实用户反馈与邀请区域 (纯白高光卡片)
   ========================================================================== */
.feedback-section {
  padding: 90px 0;
  position: relative;
  z-index: 2;
}

.feedback-box {
  background: linear-gradient(135deg, #ffffff 0%, #f0fdf9 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px);
}

.feedback-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 48px;
  align-items: center;
}

.feedback-intro h3 {
  font-size: 1.85rem;
  color: var(--color-text-title);
  margin-bottom: 14px;
}

.feedback-intro p {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.feedback-guarantees {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.feedback-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.form-input, .form-textarea, .form-select {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--color-text-title);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 10px rgba(13, 148, 136, 0.2);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* ==========================================================================
   常见问题 FAQ (支持优雅平滑手风琴展开)
   ========================================================================== */
.faq-section {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(14px);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.04);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item.active {
  border-color: var(--color-border-hover);
  box-shadow: 0 6px 20px rgba(13, 148, 136, 0.12), var(--shadow-glow);
}

.faq-question-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  color: var(--color-text-title);
  font-size: 1.05rem;
  font-weight: 600;
  font-family: inherit;
}

.faq-icon-cross {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(20, 184, 166, 0.12);
  color: var(--color-brand-primary);
  transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.faq-item.active .faq-icon-cross {
  transform: rotate(45deg);
  background: var(--color-brand-primary);
  color: #ffffff;
}

.faq-answer-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer-content {
  padding: 0 24px 22px 24px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ==========================================================================
   底部行动号召 (Bottom CTA Strip)
   ========================================================================== */
.bottom-cta-section {
  position: relative;
  padding: 90px 0;
  z-index: 2;
  text-align: center;
}

.bottom-cta-card {
  background: linear-gradient(135deg, #f0fdf9 0%, #ccfbf1 50%, #e6fcf5 100%);
  border: 1px solid rgba(13, 148, 136, 0.25);
  border-radius: var(--radius-xl);
  padding: 60px 30px;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: 0 20px 50px rgba(13, 148, 136, 0.1), var(--shadow-glow);
}

.bottom-cta-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--color-text-title);
  margin-bottom: 16px;
}

.bottom-cta-desc {
  font-size: 1.08rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 32px auto;
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  position: relative;
  background: #edf7f4;
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px 0;
  z-index: 2;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-brand-primary);
}

.footer-bottom-row {
  border-top: 1px solid rgba(13, 148, 136, 0.12);
  padding-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-text-subtle);
  flex-wrap: wrap;
  gap: 12px;
}

/* 动效动画定义 */
@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

@keyframes sphereFloat {
  0%, 100% { transform: translateY(0) rotateY(0deg); }
  50% { transform: translateY(-12px) rotateY(6deg); }
}

@keyframes auraBreathe {
  0%, 100% { transform: scale(1); opacity: 0.35; }
  50% { transform: scale(1.14); opacity: 0.6; }
}

@keyframes orbitSpin {
  0% { transform: rotateX(65deg) rotateY(20deg) rotateZ(0deg); }
  100% { transform: rotateX(65deg) rotateY(20deg) rotateZ(360deg); }
}

@keyframes orbitSpinReverse {
  0% { transform: rotateX(-50deg) rotateY(40deg) rotateZ(360deg); }
  100% { transform: rotateX(-50deg) rotateY(40deg) rotateZ(0deg); }
}

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

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

@keyframes mistDriftSlow {
  0% { transform: translateX(0) translateY(0); }
  100% { transform: translateX(-15%) translateY(-5%); }
}

@keyframes mistDriftReverse {
  0% { transform: translateX(0) translateY(0); }
  100% { transform: translateX(18%) translateY(6%); }
}

@keyframes rayGleam {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.85; }
}

@keyframes badgePulse {
  0%, 100% { border-color: rgba(13, 148, 136, 0.25); }
  50% { border-color: rgba(13, 148, 136, 0.6); }
}

/* 偏好减少动效支持 */
@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;
  }
}