/* ==========================================================================
   一元机场 (1yuanjichang.homes) - 官方网站样式表
   框架编号: 61 手机主屏 手机模型内滚动
   ========================================================================== */

:root {
  /* 品牌核心色彩 */
  --color-bg-primary: #070B14;
  --color-bg-surface: #0E1526;
  --color-bg-card: #141D33;
  --color-bg-elevated: #1B2642;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(56, 189, 248, 0.3);
  
  --color-brand-primary: #38BDF8;
  --color-brand-secondary: #3B82F6;
  --color-brand-emerald: #10B981;
  --color-brand-accent: #F59E0B;
  --color-brand-danger: #EF4444;

  /* 文字颜色 */
  --color-text-title: #FFFFFF;
  --color-text-main: #E2E8F0;
  --color-text-muted: #94A3B8;
  --color-text-subtle: #64748B;

  /* 渐变特效 */
  --grad-brand: linear-gradient(135deg, #38BDF8 0%, #3B82F6 50%, #10B981 100%);
  --grad-card-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
  --grad-hero: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(56, 189, 248, 0.18), transparent 70%);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.2);

  /* 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, "Liberation Mono", "Courier New", monospace;

  /* 尺寸与间距 */
  --max-width: 1200px;
  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* 动画过渡 */
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s ease;
  --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 {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  color-scheme: dark;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 背景科技星网与 3D 深度空间 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(rgba(56, 189, 248, 0.08) 1px, transparent 1px),
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(56, 189, 248, 0.22), transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(16, 185, 129, 0.12), transparent 60%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(59, 130, 246, 0.14), transparent 60%);
  background-size: 36px 36px, 100% 100%, 100% 100%, 100% 100%;
  background-position: 0 0, 50% 0, 0 0, 0 0;
  pointer-events: none;
  z-index: -1;
  animation: bgPulse3D 16s ease-in-out infinite alternate;
}

@keyframes bgPulse3D {
  0% { filter: brightness(1) contrast(1); }
  50% { filter: brightness(1.1) contrast(1.05); }
  100% { filter: brightness(0.95) contrast(1); }
}

/* ==========================================================================
   纵向连续滚动与锚点偏移控制 (Vertical Continuous Scroll)
   ========================================================================== */
#hero, #knowledge, #plans, #timeline, #articles, #feedback, #faq {
  scroll-margin-top: 88px;
}

/* 滚动平滑渐入动效 (Scroll Reveal) */
.scroll-reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

.stagger-1 { transition-delay: 60ms; }
.stagger-2 { transition-delay: 120ms; }
.stagger-3 { transition-delay: 180ms; }
.stagger-4 { transition-delay: 240ms; }
.stagger-5 { transition-delay: 300ms; }
.stagger-6 { transition-delay: 360ms; }

@media (prefers-reduced-motion: reduce) {
  .scroll-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

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

/* 章节通用标题 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--color-brand-primary);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-tag .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-brand-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-brand-emerald);
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.5; }
}

.section-title {
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  font-weight: 800;
  color: var(--color-text-title);
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   1. 顶部导航栏 (Navbar)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(7, 11, 20, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  background: rgba(7, 11, 20, 0.95);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text-title);
  perspective: 800px;
  transform-style: preserve-3d;
  cursor: pointer;
  position: relative;
  text-decoration: none;
}

.brand-logo-icon {
  width: 42px;
  height: 42px;
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), filter 0.4s ease;
  filter: drop-shadow(0 4px 12px rgba(56, 189, 248, 0.35));
  animation: logo3DEntrance 1s cubic-bezier(0.16, 1, 0.3, 1) backwards, logo3DFloat 6s ease-in-out infinite alternate;
}

@keyframes logo3DEntrance {
  0% {
    opacity: 0;
    transform: perspective(600px) rotateX(30deg) translateY(-10px) scale(0.85);
  }
  100% {
    opacity: 1;
    transform: perspective(600px) rotateX(0deg) translateY(0) scale(1);
  }
}

@keyframes logo3DFloat {
  0% {
    transform: perspective(600px) translateY(0) rotateZ(0deg);
  }
  50% {
    transform: perspective(600px) translateY(-3px) rotateZ(1.5deg);
  }
  100% {
    transform: perspective(600px) translateY(1px) rotateZ(-1deg);
  }
}

.brand-logo:hover .brand-logo-icon {
  filter: drop-shadow(0 6px 20px rgba(56, 189, 248, 0.6)) drop-shadow(0 0 10px rgba(16, 185, 129, 0.4));
}

.brand-logo-text {
  display: flex;
  flex-direction: column;
  transform: translateZ(10px);
}

.brand-logo-name {
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  background: linear-gradient(120deg, #FFFFFF 30%, #38BDF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-logo-sub {
  font-size: 0.68rem;
  color: var(--color-text-subtle);
  letter-spacing: 0.08em;
  font-weight: 600;
}

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 8px 0;
}

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

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

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

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  min-height: 44px;
}

.btn-primary {
  background: var(--grad-brand);
  color: #070B14;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.55);
}

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

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text-title);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--color-brand-primary);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-full);
}

/* 移动端汉堡按钮 */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  cursor: pointer;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-title);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.mobile-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   2. 首屏 Hero 区域 (含框架61 手机主屏展示)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 60px 0 100px 0;
  overflow: hidden;
}

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

.hero-content {
  max-width: 620px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-brand-emerald);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 4vw, 3.35rem);
  font-weight: 800;
  color: var(--color-text-title);
  line-height: 1.18;
  margin-bottom: 22px;
  letter-spacing: -0.025em;
}

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

.hero-desc {
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-trust-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

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

.trust-num {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-text-title);
  font-family: var(--font-mono);
}

.trust-num span {
  color: var(--color-brand-primary);
}

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

/* ==========================================================================
   首屏品牌主视觉遥测卡片 (Hero Brand Visual)
   ========================================================================== */
.hero-brand-visual {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
}

.hero-brand-card {
  background: rgba(14, 21, 38, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 24px;
  padding: 30px 26px;
  box-shadow: 
    0 20px 50px rgba(0, 0, 0, 0.6),
    0 0 30px rgba(56, 189, 248, 0.1);
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.hero-brand-card:hover {
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-3px);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 40px rgba(56, 189, 248, 0.2);
}

.hero-brand-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-brand-primary), var(--color-brand-emerald), transparent);
}

.brand-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  color: #FFFFFF;
}

.brand-card-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--color-brand-emerald);
  background: rgba(16, 185, 129, 0.12);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-weight: 600;
}

/* 核心连接触发区域 */
.brand-connect-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-node-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand-node-name {
  font-size: 1.05rem;
  font-weight: 800;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-node-desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.brand-connect-btn {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-weight: 800;
  font-size: 0.82rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
  transition: all var(--transition-fast);
}

.brand-connect-btn:hover {
  transform: scale(1.03);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
}

.brand-connect-btn.is-disconnected {
  background: #334155;
  box-shadow: none;
}

/* 遥测与速率仪表 */
.brand-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.brand-telemetry-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 10px 8px;
  text-align: center;
}

.brand-telemetry-val {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-brand-primary);
}

.brand-telemetry-lbl {
  font-size: 0.72rem;
  color: var(--color-text-subtle);
  margin-top: 2px;
}

/* 快捷节点切换条 */
.brand-nodes-selector {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.brand-node-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.brand-node-pill:hover, .brand-node-pill.is-active {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.3);
}

.brand-node-ping {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-brand-emerald);
}

/* 知识专题入口网格 (第 2 区底部) */
.knowledge-topics-section {
  margin-top: 60px;
  padding-top: 48px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.knowledge-topics-header {
  text-align: center;
  margin-bottom: 32px;
}

.knowledge-topics-header h3 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-title);
  margin-bottom: 8px;
}

.knowledge-topics-header p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

.knowledge-topics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.topic-entry-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.topic-entry-card:hover {
  border-color: var(--color-brand-primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.topic-entry-icon {
  font-size: 1.6rem;
}

.topic-entry-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-title);
  line-height: 1.4;
}

.topic-entry-desc {
  font-size: 0.82rem;
  color: var(--color-text-subtle);
  line-height: 1.5;
}

.topic-entry-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-brand-primary);
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: auto;
}

/* ==========================================================================
   3. 核心功能特点 (Features)
   ========================================================================== */
.features-section {
  padding: 90px 0;
  background-color: var(--color-bg-surface);
  position: relative;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(56, 189, 248, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--color-brand-primary);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-brand-emerald);
  border-color: rgba(16, 185, 129, 0.2);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-brand-accent);
  border-color: rgba(245, 158, 11, 0.2);
}

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

.feature-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   4. 套餐价格区域 (Pricing - 严谨对齐用户截图)
   ========================================================================== */
.pricing-section {
  padding: 100px 0;
  position: relative;
}

/* 周期切换器 */
.pricing-cycle-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: -20px auto 48px auto;
  background: var(--color-bg-card);
  padding: 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  width: fit-content;
}

.cycle-btn {
  padding: 8px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.cycle-btn.active {
  background: var(--color-brand-primary);
  color: #070B14;
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.35);
}

/* 套餐卡片网格 - 还原截图 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  perspective: 1200px;
}

.pricing-card {
  background: #EAEFEC;
  color: #121820;
  border-radius: 16px;
  padding: 38px 32px 32px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease, border-color 0.3s ease;
  border: 2px solid transparent;
  transform-style: preserve-3d;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  overflow: visible;
}

.pricing-card:hover {
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 25px rgba(56, 189, 248, 0.15);
}

/* 动态光泽反射层 (3D Specular Sheen) */
.card-sheen-overlay {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  pointer-events: none;
  z-index: 5;
  opacity: 0;
  transition: opacity 0.3s ease;
  mix-blend-mode: overlay;
}

/* 截图中的 PLAN 02 推荐卡片样式 - 红框标注 + 3D 脉冲光晕 */
.pricing-card.is-featured {
  border: 2px solid #E05342;
  box-shadow: 0 14px 40px rgba(224, 83, 66, 0.25), 0 0 20px rgba(224, 83, 66, 0.15);
  position: relative;
  animation: pulseFeatured3D 4s ease-in-out infinite alternate;
}

@keyframes pulseFeatured3D {
  0% {
    box-shadow: 0 14px 35px rgba(224, 83, 66, 0.2), 0 0 15px rgba(224, 83, 66, 0.15);
    border-color: #E05342;
  }
  100% {
    box-shadow: 0 20px 50px rgba(224, 83, 66, 0.4), 0 0 35px rgba(224, 83, 66, 0.3);
    border-color: #FF6B5A;
  }
}

.plan-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  transform: translateZ(15px);
}

.plan-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #5E6973;
  text-transform: uppercase;
}

.plan-badge {
  background-color: #E05342;
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 10px rgba(224, 83, 66, 0.4);
}

.plan-name {
  font-size: 1.85rem;
  font-weight: 800;
  color: #0D131A;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  transform: translateZ(24px);
}

.plan-sub {
  font-size: 0.95rem;
  color: #4A5562;
  margin-bottom: 30px;
  transform: translateZ(12px);
}

.plan-features {
  list-style: none;
  margin-bottom: 36px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transform: translateZ(16px);
}

.plan-feature-item {
  font-size: 1rem;
  font-weight: 600;
  color: #1A222C;
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-feature-plus {
  color: #E05342;
  font-weight: 700;
  font-size: 1.1rem;
}

.plan-divider {
  height: 1px;
  background-color: #D3DBD7;
  width: 100%;
  margin-top: auto;
  margin-bottom: 24px;
  transform: translateZ(8px);
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  margin-bottom: 24px;
  transform: translateZ(32px);
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: #0D131A;
  margin-right: 2px;
}

.plan-price-num {
  font-size: 2.75rem;
  font-weight: 900;
  color: #0D131A;
  font-family: var(--font-sans);
  line-height: 1;
  letter-spacing: -0.03em;
}

.plan-price-period {
  font-size: 0.95rem;
  font-weight: 600;
  color: #5E6973;
  margin-left: 4px;
}

/* 按钮统一使用 立即前往注册 */
.plan-btn {
  width: 100%;
  background: #172621;
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 20px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.plan-btn:hover {
  background: #09120F;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  transform: translateY(-1px);
}

.plan-btn-arrow {
  font-size: 1.1rem;
  transition: transform var(--transition-fast);
}

.plan-btn:hover .plan-btn-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   5. 多平台使用场景与配置步骤 (Scenarios)
   ========================================================================== */
.scenarios-section {
  padding: 90px 0;
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.workflow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 50px;
}

.step-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  position: relative;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-brand-primary);
  opacity: 0.4;
  margin-bottom: 8px;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-pill {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition-fast);
}

.platform-pill:hover {
  border-color: var(--color-brand-primary);
  transform: translateY(-2px);
}

.platform-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-brand-primary);
}

.platform-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-title);
  margin-bottom: 2px;
}

.platform-info p {
  font-size: 0.8rem;
  color: var(--color-text-subtle);
}

/* ==========================================================================
   6. 原创知识文章列表展示 (Articles)
   ========================================================================== */
.articles-section {
  padding: 100px 0;
}

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

.article-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--color-text-subtle);
  margin-bottom: 14px;
}

.article-tag {
  color: var(--color-brand-primary);
  font-weight: 600;
  background: rgba(56, 189, 248, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.article-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-title);
  line-height: 1.4;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.article-card:hover .article-title {
  color: var(--color-brand-primary);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-brand-primary);
  font-weight: 600;
}

/* ==========================================================================
   7. 动态用户真实体验评价区 (Dynamic Reviews & Feedback)
   ========================================================================== */
.reviews-section {
  padding: 100px 0;
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

/* 顶部徽标样式 */
.reviews-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--color-brand-primary);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
}

/* 动态无限滚动轮播跑马灯轨道 */
.reviews-marquee-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  padding: 20px 0;
  /* 左右两端边缘渐变遮罩，营造无限深邃动态感 */
  mask-image: linear-gradient(to right, transparent 0%, black 6%, black 94%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 6%, black 94%, transparent 100%);
}

.reviews-marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marqueeScroll 45s linear infinite;
  will-change: transform;
}

.reviews-marquee-track:hover {
  animation-play-state: paused;
}

@keyframes marqueeScroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* 单张评价卡片样式 (严格还原用户图二质感) */
.review-card {
  width: 380px;
  min-width: 380px;
  background: #0B1120;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 28px 24px 24px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  user-select: none;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(56, 189, 248, 0.15);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  font-size: 1.15rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.95rem;
  color: #E2E8F0;
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: #FFFFFF;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.avatar-ak { background: linear-gradient(135deg, #6366F1, #4F46E5); }
.avatar-mt { background: linear-gradient(135deg, #EC4899, #BE185D); }
.avatar-dw { background: linear-gradient(135deg, #3B82F6, #1D4ED8); }
.avatar-el { background: linear-gradient(135deg, #06B6D4, #0891B2); }
.avatar-mc { background: linear-gradient(135deg, #10B981, #059669); }
.avatar-sz { background: linear-gradient(135deg, #F59E0B, #D97706); }

.review-name-role h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 2px;
}

.review-name-role p {
  font-size: 0.8rem;
  color: #94A3B8;
  margin: 0;
}

/* 动态控制器与反馈提交条 */
.reviews-control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 36px auto 0 auto;
  padding: 0 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.reviews-nav-arrows {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-arrow-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.review-arrow-btn:hover {
  background: var(--color-brand-primary);
  color: #070B14;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.open-feedback-modal-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-brand-primary);
  border: 1px dashed rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.05);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.open-feedback-modal-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--color-brand-primary);
}

/* 反馈模态弹窗 */
.feedback-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.feedback-modal-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.feedback-modal-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-lg), 0 0 40px rgba(0, 0, 0, 0.8);
  position: relative;
  transform: translateY(20px);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.feedback-modal-overlay.is-visible .feedback-modal-box {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-close-btn:hover {
  background: var(--color-brand-danger);
  color: #FFFFFF;
}

.feedback-modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-title);
  margin-bottom: 8px;
}

.feedback-modal-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.feedback-form-group {
  margin-bottom: 16px;
}

.feedback-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.feedback-input, .feedback-textarea {
  width: 100%;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--color-text-title);
  font-size: 0.9rem;
  transition: border-color var(--transition-fast);
}

.feedback-input:focus, .feedback-textarea:focus {
  border-color: var(--color-brand-primary);
}

.feedback-textarea {
  height: 90px;
  resize: vertical;
}

/* ==========================================================================
   8. 常见问题 FAQ (可折叠手风琴)
   ========================================================================== */
.faq-section {
  padding: 100px 0;
}

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

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--color-border-hover);
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-title);
  background: none;
  border: none;
}

.faq-icon {
  width: 24px;
  height: 24px;
  min-width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
  transition: transform var(--transition-normal), background-color var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  background: var(--color-brand-primary);
  color: #070B14;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 28px;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  transition: max-height 0.4s ease-in-out;
  padding-bottom: 24px;
}

.faq-answer p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  padding-top: 4px;
}

/* ==========================================================================
   9. 页脚 (Footer)
   ========================================================================== */
.site-footer {
  background-color: #05080E;
  border-top: 1px solid var(--color-border);
  padding: 70px 0 30px 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-brand-desc {
  color: var(--color-text-subtle);
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 340px;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text-title);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--color-text-subtle);
}

.footer-security-note {
  font-size: 0.8rem;
  color: var(--color-text-subtle);
  line-height: 1.5;
  margin-top: 12px;
}

/* ==========================================================================
   10. 交互微动效与无障碍
   ========================================================================== */
@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;
  }
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 60px;
  }
  .hero-content {
    max-width: 720px;
    margin: 0 auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-trust-badges {
    max-width: 500px;
    margin: 0 auto;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .pricing-card {
    padding: 24px 18px;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .knowledge-topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
  }
  .nav-menu.is-active {
    transform: translateY(0);
    box-shadow: 0 20px 40px rgba(0,0,0,0.8);
  }
  .nav-actions .btn-primary {
    display: none; /* 留出手机顶栏空间，主要展示汉堡与品牌 */
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .knowledge-topics-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }
  .workflow-steps, .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feedback-banner {
    grid-template-columns: 1fr;
    padding: 30px 20px;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 428px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .hero-section {
    padding: 36px 0 60px 0;
  }
  .workflow-steps, .platforms-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .plan-price-num {
    font-size: 2.2rem;
  }
  .pricing-card {
    padding: 24px 18px;
  }
  .section-title {
    font-size: 1.7rem;
  }
  .review-card {
    width: 290px;
    min-width: 290px;
    padding: 20px 16px;
  }
}

@media (max-width: 360px) {
  .container {
    padding-left: 12px;
    padding-right: 12px;
  }
  .hero-title {
    font-size: 1.65rem;
  }
  .plan-price-num {
    font-size: 2rem;
  }
  .cycle-btn {
    padding: 6px 14px;
    font-size: 0.8rem;
  }
}