/* ==========================================================================
   银河云 YinHeYun - 等离子风暴 + 日冕喷发 + 太阳科技
   【配色标准】
   - 主背景：#020617 深空黑
   - 主色：#F59E0B 等离子橙
   - 次色：#EF4444 日冕红
   ========================================================================== */

:root {
  --bg-dark: #020617;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --bg-card-highlight: linear-gradient(180deg, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 0.95) 100%);
  
  --border-light: rgba(245, 158, 11, 0.15);
  --border-glow: rgba(245, 158, 11, 0.45);
  --border-active: rgba(239, 68, 68, 0.65);
  
  --primary: #F59E0B;
  --primary-light: #FBBF24;
  --secondary: #EF4444;
  --secondary-light: #F87171;

  --primary-gradient: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
  --secondary-gradient: linear-gradient(135deg, #EF4444 0%, #F59E0B 100%);
  --text-gradient: linear-gradient(135deg, #FFFFFF 0%, #F59E0B 45%, #EF4444 100%);
  
  --accent-gold: #F59E0B;
  --accent-green: #10B981;

  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;

  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(245, 158, 11, 0.6);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-stack);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

/* Accessibility Skip Link (仅在键盘 Tab 聚焦时显示) */
.skip-link {
  position: absolute;
  top: -999px;
  left: 20px;
  background: var(--primary-gradient);
  color: #000;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  z-index: 99999;
  text-decoration: none;
  box-shadow: 0 0 25px rgba(245, 158, 11, 0.9);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
  outline: 3px solid #FFFFFF;
}

/* 全局交互元素键盘无障碍焦点样式 */
:focus-visible {
  outline: 2px solid var(--primary-light);
  outline-offset: 3px;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  overflow-wrap: break-word;
  word-break: break-word;
  background-color: #020617;
  background-image: 
    radial-gradient(circle at 85% 15%, rgba(245, 158, 11, 0.16) 0%, transparent 55%),
    radial-gradient(circle at 15% 45%, rgba(239, 68, 68, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 60% 85%, rgba(245, 158, 11, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 2;
}

/* ==========================================================================
   背景动效：3条等离子耀斑 SVG + 4个橙/红粒子上升
   ========================================================================== */
.plasma-bg-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.plasma-flares-svg {
  position: absolute;
  width: 100%;
  height: 100%;
  inset: 0;
}

.plasma-flare {
  fill: none;
  stroke-dasharray: 240 380;
  animation: plasma-flare-flow 2s linear infinite;
}

@keyframes plasma-flare-flow {
  from { stroke-dashoffset: 620; }
  to { stroke-dashoffset: 0; }
}

.plasma-particle {
  position: absolute;
  border-radius: 50%;
  filter: blur(1px);
  pointer-events: none;
  animation: plasma-particle-rise linear infinite;
}

.plasma-particle.p1 {
  width: 9px;
  height: 9px;
  background: #F59E0B;
  box-shadow: 0 0 16px #F59E0B, 0 0 32px #EF4444;
  left: 14%;
  bottom: -30px;
  animation-duration: 5s;
  animation-delay: 0s;
}

.plasma-particle.p2 {
  width: 13px;
  height: 13px;
  background: #EF4444;
  box-shadow: 0 0 24px #EF4444, 0 0 40px #F59E0B;
  left: 38%;
  bottom: -30px;
  animation-duration: 6.8s;
  animation-delay: 1.6s;
}

.plasma-particle.p3 {
  width: 7px;
  height: 7px;
  background: #F59E0B;
  box-shadow: 0 0 14px #F59E0B;
  left: 68%;
  bottom: -30px;
  animation-duration: 4.6s;
  animation-delay: 0.8s;
}

.plasma-particle.p4 {
  width: 11px;
  height: 11px;
  background: #EF4444;
  box-shadow: 0 0 22px #EF4444, 0 0 32px #F59E0B;
  left: 86%;
  bottom: -30px;
  animation-duration: 5.6s;
  animation-delay: 2.5s;
}

@keyframes plasma-particle-rise {
  0% { transform: translateY(0) scale(0.6); opacity: 0; }
  15% { opacity: 0.9; }
  85% { opacity: 0.75; }
  100% { transform: translateY(-115vh) scale(1.3); opacity: 0; }
}

/* ==========================================================================
   Header & Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  height: 72px;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: #fff;
}

.brand-logo .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.6);
}

.brand-logo .logo-icon svg {
  width: 22px;
  height: 22px;
  fill: #000;
}

.brand-logo span.highlight {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-link {
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover {
  color: #F59E0B;
}

/* ==========================================================================
   CTA 按钮规范：橙到红渐变（文字黑色），圆角8px，带30px橙色辉光
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
  color: #000000;
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.6);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 45px rgba(245, 158, 11, 0.9), 0 0 20px rgba(239, 68, 68, 0.8);
  filter: brightness(1.08);
  color: #000000;
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.7);
  color: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: 8px;
}

.btn-secondary:hover {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.45);
  transform: translateY(-2px);
}

.btn-large {
  min-height: 54px;
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: 8px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero Section：标题及文字内容靠左排版，右侧放置太阳科技动画
   ========================================================================== */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
  overflow: hidden;
}

/* 左图文 + 右太阳科技动画 2 栏网格容器 */
.hero-grid-wrapper {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) 360px;
  align-items: center;
  gap: 40px;
  margin-bottom: 50px;
  position: relative;
}

/* 左侧标题与简介排版 */
.hero-text-col {
  text-align: left;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 9999px;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.35);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-light);
  margin-bottom: 22px;
}

.badge-pill .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #EF4444;
  border-radius: 50%;
  box-shadow: 0 0 10px #EF4444;
}

.hero-title {
  font-size: clamp(2.3rem, 4.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: #fff;
  text-align: left;
}

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

.hero-subtitle {
  max-width: 660px;
  margin: 0 0 34px 0;
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
  color: var(--text-secondary);
  line-height: 1.75;
  text-align: left;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

/* 右侧动画放置列 */
.hero-visual-col {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 100%;
  height: 360px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.stat-value span {
  color: var(--primary-light);
  font-size: 1.2rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ==========================================================================
   【右侧动画组件】：太阳核心 + 8条日冕喷流 + 2层虚线轨道 + 3个发光粒子
   ========================================================================== */
.solar-tech-system {
  position: relative;
  width: 360px;
  height: 360px;
  pointer-events: none;
  z-index: 1;
}

/* 160px 太阳核心（径向渐变白→橙→红，blur+脉冲呼吸 3秒一周期+双层 box-shadow 辉光） */
.solar-sun-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, #FFFFFF 0%, #F59E0B 48%, #EF4444 82%, #991B1B 100%);
  filter: blur(1.5px);
  box-shadow: 0 0 45px rgba(245, 158, 11, 0.9), 0 0 90px rgba(239, 68, 68, 0.65);
  animation: solar-core-pulse 3s ease-in-out infinite alternate;
  z-index: 5;
}

@keyframes solar-core-pulse {
  0% {
    transform: translate(-50%, -50%) scale(0.94);
    box-shadow: 0 0 35px rgba(245, 158, 11, 0.8), 0 0 75px rgba(239, 68, 68, 0.55);
    filter: blur(1px);
  }
  100% {
    transform: translate(-50%, -50%) scale(1.06);
    box-shadow: 0 0 65px rgba(245, 158, 11, 1), 0 0 120px rgba(239, 68, 68, 0.85);
    filter: blur(2.5px);
  }
}

/* 太阳周围 8 条 8×100px 日冕喷流（橙/红交替，每 45° 一条，脉冲缩放 1.5 秒一周期，错开延迟） */
.corona-jet {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 100px;
  border-radius: 4px;
  transform-origin: 4px 130px;
  animation: corona-jet-pulse 1.5s ease-in-out infinite alternate;
  z-index: 4;
}

.corona-jet.jet-orange {
  background: linear-gradient(to top, rgba(245, 158, 11, 0.95), rgba(245, 158, 11, 0.1) 80%, transparent);
  box-shadow: 0 0 14px rgba(245, 158, 11, 0.8);
}

.corona-jet.jet-red {
  background: linear-gradient(to top, rgba(239, 68, 68, 0.95), rgba(239, 68, 68, 0.1) 80%, transparent);
  box-shadow: 0 0 14px rgba(239, 68, 68, 0.8);
}

/* 8 个方向角度 */
.corona-jet:nth-child(1) { --angle: 0deg; animation-delay: 0s; }
.corona-jet:nth-child(2) { --angle: 45deg; animation-delay: 0.19s; }
.corona-jet:nth-child(3) { --angle: 90deg; animation-delay: 0.38s; }
.corona-jet:nth-child(4) { --angle: 135deg; animation-delay: 0.57s; }
.corona-jet:nth-child(5) { --angle: 180deg; animation-delay: 0.76s; }
.corona-jet:nth-child(6) { --angle: 225deg; animation-delay: 0.95s; }
.corona-jet:nth-child(7) { --angle: 270deg; animation-delay: 1.14s; }
.corona-jet:nth-child(8) { --angle: 315deg; animation-delay: 1.33s; }

@keyframes corona-jet-pulse {
  0% {
    transform: translate(-50%, -100%) rotate(var(--angle)) scaleY(0.7);
    opacity: 0.55;
  }
  100% {
    transform: translate(-50%, -100%) rotate(var(--angle)) scaleY(1.35);
    opacity: 1;
    filter: drop-shadow(0 0 8px #F59E0B);
  }
}

/* 2 层虚线圆轨道反向旋转 */
.dashed-orbit-1 {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 2px dashed rgba(245, 158, 11, 0.45);
  transform: translate(-50%, -50%);
  animation: orbit-spin-cw 10s linear infinite;
  z-index: 3;
}

.dashed-orbit-2 {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 2px dashed rgba(239, 68, 68, 0.4);
  transform: translate(-50%, -50%);
  animation: orbit-spin-ccw 14s linear infinite;
  z-index: 3;
}

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

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

/* 3 个橙/红发光粒子沿 150px 半径圆轨道运行 6 秒一周期 */
.revolving-track-150 {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: orbit-revolve-6s 6s linear infinite;
  z-index: 6;
  pointer-events: none;
}

@keyframes orbit-revolve-6s {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.orbit-luminary {
  position: absolute;
  border-radius: 50%;
}

.orbit-luminary.lum-1 {
  width: 12px;
  height: 12px;
  background: #F59E0B;
  box-shadow: 0 0 16px #F59E0B, 0 0 30px #EF4444;
  top: -6px;
  left: calc(50% - 6px);
}

.orbit-luminary.lum-2 {
  width: 10px;
  height: 10px;
  background: #EF4444;
  box-shadow: 0 0 16px #EF4444, 0 0 26px #F59E0B;
  top: calc(75% - 5px);
  left: calc(93.3% - 5px);
}

.orbit-luminary.lum-3 {
  width: 11px;
  height: 11px;
  background: #F59E0B;
  box-shadow: 0 0 18px #F59E0B, 0 0 28px #EF4444;
  top: calc(75% - 5px);
  left: calc(6.7% - 5px);
}

/* ==========================================================================
   Section Common
   ========================================================================== */
.section {
  padding: 80px 0;
  position: relative;
  z-index: 2;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Core Advantages (3 Cards)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.advantage-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.advantage-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.3);
}

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

.card-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
}

.card-icon-wrapper svg {
  width: 30px;
  height: 30px;
  fill: currentColor;
}

.advantage-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #fff;
}

.advantage-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.advantage-features {
  list-style: none;
  margin-top: auto;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.advantage-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.advantage-features li svg {
  width: 16px;
  height: 16px;
  fill: var(--primary);
  flex-shrink: 0;
}

/* ==========================================================================
   Streaming & AI Cards
   ========================================================================== */
.unlock-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.unlock-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  transition: all 0.3s ease;
}

.unlock-box:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.25);
}

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

.unlock-box-header .icon-badge {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
}

.unlock-box-header .icon-badge svg {
  width: 24px;
  height: 24px;
  fill: #000;
}

.unlock-box-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
}

.unlock-box-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.brand-chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
}

.brand-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  transition: all 0.2s ease;
}

.brand-chip:hover {
  background: rgba(245, 158, 11, 0.12);
  border-color: rgba(245, 158, 11, 0.35);
  transform: translateY(-2px);
}

.brand-chip svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.brand-chip span {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.unlock-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.mini-badge {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(245, 158, 11, 0.08);
  color: var(--primary-light);
  border: 1px solid var(--border-light);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 0 35px rgba(245, 158, 11, 0.3);
}

.pricing-card.featured {
  background: var(--bg-card-highlight);
  border-color: var(--border-active);
  box-shadow: 0 0 45px rgba(245, 158, 11, 0.35);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #000;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: 9999px;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.6);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 24px;
  text-align: left;
}

.pricing-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 20px 0;
}

.pricing-price .currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.pricing-price .amount {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1;
}

.pricing-price .period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 24px 0 32px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li svg {
  width: 17px;
  height: 17px;
  fill: var(--primary);
  flex-shrink: 0;
}

.pricing-features li strong {
  color: #fff;
}

/* ==========================================================================
   User Reviews
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

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

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  color: var(--primary);
}

.review-stars svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #000;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
}

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

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.2s ease;
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  user-select: none;
  list-style: none;
}

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

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(245, 158, 11, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 14px;
}

.faq-icon svg {
  width: 14px;
  height: 14px;
  fill: var(--primary);
}

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

.faq-item[open] .faq-icon svg {
  fill: #000;
}

.faq-answer {
  padding: 0 26px 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

/* ==========================================================================
   Bottom CTA Banner
   ========================================================================== */
.bottom-cta-banner {
  background: radial-gradient(circle at 50% 50%, rgba(245, 158, 11, 0.2) 0%, rgba(15, 23, 42, 0.85) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 60px 30px;
  text-align: center;
  margin: 40px auto;
  max-width: 1000px;
  box-shadow: 0 0 50px rgba(245, 158, 11, 0.25);
}

.bottom-cta-banner h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: #fff;
}

.bottom-cta-banner p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 30px;
}

/* ==========================================================================
   Footer (严格只保留四个标题，在新页面展示)
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-light);
  background: #01040f;
  padding: 50px 0 35px;
  margin-top: 40px;
  position: relative;
  z-index: 2;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 28px;
}

.footer-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  transition: color 0.2s ease;
  padding: 6px 0;
}

.footer-nav-link:hover {
  color: #F59E0B;
}

.footer-nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width 0.2s ease;
}

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

.footer-copyright {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Subpage Common Layouts
   ========================================================================== */
.subpage-container {
  max-width: 860px;
  margin: 40px auto 80px;
  padding: 0 20px;
  position: relative;
  z-index: 2;
}

.subpage-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 36px;
}

.subpage-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--primary-light);
  margin-bottom: 20px;
  font-weight: 600;
}

.subpage-back:hover {
  color: #fff;
  text-decoration: underline;
}

.subpage-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}

.subpage-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.subpage-body {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1rem;
}

.subpage-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 22px 0 10px;
}

.subpage-body p {
  margin-bottom: 16px;
}

.subpage-body ul, .subpage-body ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

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

.highlight-box {
  background: rgba(245, 158, 11, 0.08);
  border-left: 4px solid var(--primary);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-primary);
}

.warning-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid #EF4444;
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: #FCA5A5;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

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

.sitemap-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}

.sitemap-links a:hover {
  color: var(--primary-light);
  transform: translateX(4px);
}

.sitemap-card-wide {
  grid-column: span 2;
  border-color: rgba(245, 158, 11, 0.35);
  box-shadow: 0 0 25px rgba(245, 158, 11, 0.08);
}

.sitemap-card-wide h3 {
  border-bottom: 1px solid rgba(245, 158, 11, 0.3);
}

.sitemap-card h3 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.sitemap-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(245, 158, 11, 0.15);
  color: var(--primary-light);
  border: 1px solid rgba(245, 158, 11, 0.4);
  font-weight: 600;
}

.sitemap-badge-red {
  background: rgba(239, 68, 68, 0.15);
  color: #F87171;
  border-color: rgba(239, 68, 68, 0.4);
}

.sitemap-links-2col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 20px;
}

.sitemap-tag {
  font-size: 0.72rem;
  color: var(--primary-light);
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
  white-space: nowrap;
}

/* ==========================================================================
   知识科普与 SEO 文章样式
   ========================================================================== */
.toc-section {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  margin-bottom: 50px;
}

.toc-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.toc-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.article-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.article-nav-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  transition: all 0.25s ease;
}

.article-nav-card:hover {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.45);
  transform: translateY(-3px);
}

.article-nav-num {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article-nav-heading {
  font-size: 0.96rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.5;
}

.article-nav-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.article-nav-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  background: rgba(245, 158, 11, 0.08);
  color: var(--primary-light);
  border-radius: 4px;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 44px 38px;
  margin-bottom: 40px;
  position: relative;
  scroll-margin-top: 90px;
}

.seo-article-card:hover {
  border-color: rgba(245, 158, 11, 0.4);
}

.seo-article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.seo-article-badge {
  background: var(--primary-gradient);
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 4px;
}

.seo-article-title {
  font-size: clamp(1.4rem, 2.5vw, 1.85rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.35;
  margin-bottom: 22px;
}

.seo-article-content {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.85;
}

.seo-article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin: 28px 0 12px;
  padding-left: 12px;
  border-left: 3px solid var(--primary);
}

.seo-article-content p {
  margin-bottom: 16px;
}

.seo-article-content ul, .seo-article-content ol {
  padding-left: 22px;
  margin-bottom: 18px;
}

.seo-article-content li {
  margin-bottom: 8px;
}

.seo-article-content strong {
  color: #fff;
}

.internal-link {
  color: var(--primary-light);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}

.internal-link:hover {
  color: #fff;
}

/* 文章专属 FAQ 问答区块 */
.article-faq-wrapper {
  margin-top: 28px;
  margin-bottom: 24px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-md);
  padding: 22px 24px;
}

.article-faq-heading {
  font-size: 1.05rem;
  color: var(--primary-light);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 10px;
}

.article-faq-heading svg {
  width: 18px;
  height: 18px;
  stroke: var(--primary-light);
  flex-shrink: 0;
}

.article-faq-wrapper .faq-list {
  gap: 12px;
  max-width: 100%;
}

.article-faq-wrapper .faq-item {
  background: rgba(2, 6, 23, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.article-faq-wrapper .faq-question {
  padding: 14px 18px;
  font-size: 0.95rem;
  color: #F1F5F9;
}

.article-faq-wrapper .faq-answer {
  padding: 0 18px 16px;
  font-size: 0.9rem;
  line-height: 1.68;
  color: #CBD5E1;
}

.article-cta-box {
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.article-cta-text {
  font-size: 0.92rem;
  color: var(--text-primary);
}

.article-cta-text span {
  color: var(--primary-light);
  font-weight: 700;
}

/* ==========================================================================
   Responsive Queries (@media)
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-grid-wrapper {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-visual-col {
    order: -1;
    height: 300px;
    transform: scale(0.85);
    margin: 0 auto;
  }

  .hero-title, .hero-subtitle, .hero-text-col {
    text-align: left;
  }
}

@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .unlock-wrapper {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .article-nav-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-header .nav-menu {
    display: none;
  }

  .hero-section {
    padding: 40px 0 35px;
  }

  .hero-grid-wrapper {
    margin-bottom: 35px;
    gap: 20px;
  }

  .hero-visual-col {
    height: 240px;
    transform: scale(0.68);
    margin-bottom: 10px;
  }

  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 26px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-actions .btn {
    width: 100%;
    min-height: 52px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    padding: 16px;
  }

  .stat-value {
    font-size: 1.3rem;
  }

  .stat-label {
    font-size: 0.78rem;
  }

  .section {
    padding: 55px 0;
  }

  .section-header {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .advantage-card,
  .unlock-box,
  .pricing-card,
  .review-card {
    padding: 26px 20px;
  }

  .brand-chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .sitemap-grid {
    grid-template-columns: 1fr;
  }

  .sitemap-card-wide {
    grid-column: span 1;
  }

  .sitemap-links-2col {
    grid-template-columns: 1fr;
  }

  .bottom-cta-banner {
    padding: 40px 20px;
  }

  .article-nav-grid {
    grid-template-columns: 1fr;
  }

  .seo-article-card {
    padding: 28px 20px;
  }

  .article-cta-box {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
}


/* ==========================================================================
   无障碍：减弱动态效果适配 (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;
  }
}