/* ==========================================================================
   AmyTelecom.lat - 06｜玻璃折射 (Prism Glide) 官方视觉样式表
   主题配色：深海蓝 #07152D | 极光蓝 #348BFF | 彩虹紫 #A778FF | 冰晶青 #5DE1E6 | 浅玻璃白 #F3F8FF
   ========================================================================== */

:root {
  --bg-deep-navy: #07152D;
  --bg-navy-surface: #0B1C3B;
  --bg-glass-card: rgba(11, 28, 59, 0.65);
  --bg-glass-card-hover: rgba(16, 38, 77, 0.85);
  
  --primary-aurora-blue: #348BFF;
  --primary-rainbow-purple: #A778FF;
  --primary-ice-cyan: #5DE1E6;
  
  --text-glass-white: #F3F8FF;
  --text-main: #EAF2FF;
  --text-muted: #9BB3D6;
  --text-dim: #6B85AB;
  
  --border-glass: rgba(243, 248, 255, 0.12);
  --border-glass-bright: rgba(93, 225, 230, 0.4);
  --border-refract: linear-gradient(135deg, rgba(93, 225, 230, 0.5) 0%, rgba(52, 139, 255, 0.3) 50%, rgba(167, 120, 255, 0.5) 100%);
  
  --shadow-prism-glow: 0 8px 32px 0 rgba(7, 21, 45, 0.6), 0 0 24px rgba(52, 139, 255, 0.15);
  --shadow-refract-active: 0 12px 40px 0 rgba(7, 21, 45, 0.8), 0 0 30px rgba(93, 225, 230, 0.25);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --container-max: 1200px;
}

/* 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%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep-navy);
  color: var(--text-main);
  line-height: 1.68;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 玻璃折射背景光晕渲染 */
.prism-bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: 
    radial-gradient(circle at 85% 15%, rgba(167, 120, 255, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 15% 35%, rgba(93, 225, 230, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 75% 75%, rgba(52, 139, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 20% 90%, rgba(167, 120, 255, 0.1) 0%, transparent 45%),
    #07152D;
}

/* 折射棱镜网格微纹理 */
.prism-bg-canvas::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(243, 248, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(243, 248, 255, 0.018) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 通用折射玻璃卡片基类 */
.glass-panel {
  background: var(--bg-glass-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-prism-glow);
  position: relative;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.glass-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(93, 225, 230, 0.4), rgba(167, 120, 255, 0.4), transparent);
}

.glass-panel:hover {
  border-color: rgba(93, 225, 230, 0.3);
  box-shadow: var(--shadow-refract-active);
  transform: translateY(-3px);
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 21, 45, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(243, 248, 255, 0.08);
  height: 72px;
}

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

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon-prism {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #5DE1E6, #348BFF, #A778FF);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(93, 225, 230, 0.4);
  position: relative;
  overflow: hidden;
}

.brand-icon-prism::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.7) 50%, transparent 60%);
  animation: prismShine 4s infinite linear;
}

.brand-icon-prism svg {
  width: 22px;
  height: 22px;
  color: #07152D;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-glass-white);
  letter-spacing: -0.02em;
}

.brand-title span {
  background: linear-gradient(135deg, #5DE1E6, #A778FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-link {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 8px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #5DE1E6, #A778FF);
  transition: width 0.25s ease;
}

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

.header-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: linear-gradient(135deg, rgba(93, 225, 230, 0.15), rgba(167, 120, 255, 0.2));
  border: 1px solid rgba(93, 225, 230, 0.4);
  border-radius: var(--radius-sm);
  color: var(--text-glass-white);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.header-action-btn:hover {
  background: linear-gradient(135deg, #5DE1E6, #348BFF);
  color: #07152D;
  box-shadow: 0 0 20px rgba(93, 225, 230, 0.4);
}

/* 移动端汉堡按钮 */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 8px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* 移动端抽屉导航 */
.mobile-nav-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: rgba(7, 21, 45, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-glass);
  padding: 24px 20px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(-120%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  z-index: 999;
}

.mobile-nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-drawer .nav-link {
  font-size: 1.1rem;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
}

/* 按钮体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  min-height: 48px;
}

.btn-primary {
  background: linear-gradient(135deg, #5DE1E6 0%, #348BFF 50%, #A778FF 100%);
  color: #07152D;
  border: none;
  box-shadow: 0 4px 20px rgba(93, 225, 230, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(93, 225, 230, 0.5), 0 0 15px rgba(167, 120, 255, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(11, 28, 59, 0.8);
  border: 1px solid rgba(243, 248, 255, 0.2);
  color: var(--text-glass-white);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(20, 48, 95, 0.9);
  border-color: var(--primary-ice-cyan);
  color: var(--primary-ice-cyan);
  transform: translateY(-2px);
}

/* Hero 首屏区 */
.hero-section {
  padding: 70px 0 90px;
  position: relative;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(93, 225, 230, 0.1);
  border: 1px solid rgba(93, 225, 230, 0.3);
  border-radius: 50px;
  color: var(--primary-ice-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-ice-cyan);
  box-shadow: 0 0 8px var(--primary-ice-cyan);
  animation: pulseDot 2s infinite ease-in-out;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 800;
  line-height: 1.22;
  color: var(--text-glass-white);
  margin-bottom: 20px;
  letter-spacing: -0.025em;
}

.text-gradient-prism {
  background: linear-gradient(135deg, #5DE1E6 10%, #348BFF 50%, #A778FF 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-trust-row {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-item svg {
  color: var(--primary-ice-cyan);
  width: 16px;
  height: 16px;
}

/* ==========================================================================
   2. LOGO 进入动效 (Prism Glide Logo Entrance)
   1. 从屏幕右侧轻轻滑入 (translateX(70px) -> 0)
   2. 轻微模糊到清晰 (filter: blur(14px) -> blur(0))
   3. 边缘出现柔和彩虹折射
   4. 经过约 1 秒逐渐稳定
   5. 下方出现品牌标题与按钮
   ========================================================================== */
.hero-visual-prism {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 420px;
}

.prism-refract-frame {
  width: 100%;
  max-width: 440px;
  padding: 36px 30px;
  background: rgba(11, 28, 59, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(243, 248, 255, 0.15);
  box-shadow: 0 16px 48px rgba(7, 21, 45, 0.8), 0 0 40px rgba(52, 139, 255, 0.15);
  position: relative;
  overflow: hidden;
  text-align: center;
}

/* 折射棱镜光斑效果 */
.prism-refract-frame::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 180deg at 50% 50%, rgba(93, 225, 230, 0.15) 0deg, rgba(52, 139, 255, 0.12) 90deg, rgba(167, 120, 255, 0.18) 180deg, rgba(93, 225, 230, 0.15) 360deg);
  animation: prismRotate 14s linear infinite;
  pointer-events: none;
  z-index: 0;
}

.prism-refract-inner {
  position: relative;
  z-index: 1;
}

/* LOGO 核心进入动效容器 */
.logo-entrance-block {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  animation: prismLogoSlideIn 1.15s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  will-change: transform, opacity, filter;
}

.logo-prism-crystal {
  width: 108px;
  height: 108px;
  border-radius: 26px;
  background: linear-gradient(135deg, rgba(93, 225, 230, 0.9) 0%, rgba(52, 139, 255, 0.85) 50%, rgba(167, 120, 255, 0.95) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  box-shadow: 
    0 10px 30px rgba(7, 21, 45, 0.8),
    0 0 35px rgba(93, 225, 230, 0.45),
    inset 0 1px 2px rgba(255, 255, 255, 0.6);
  position: relative;
  animation: rainbowRefractionSheen 3.5s ease-in-out infinite alternate;
}

.logo-prism-crystal svg {
  width: 60px;
  height: 60px;
  color: #07152D;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.2));
}

.logo-brand-text {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-glass-white);
}

.logo-brand-text span {
  background: linear-gradient(135deg, #5DE1E6, #A778FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-tagline {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-top: 4px;
  animation: fadeInBelow 0.8s ease-out 0.6s both;
}

.prism-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
  animation: fadeInBelow 0.8s ease-out 0.8s both;
}

.prism-metric-cell {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
}

.metric-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-ice-cyan);
}

.metric-lbl {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 2px;
}

/* 动效关键帧 */
@keyframes prismLogoSlideIn {
  0% {
    opacity: 0;
    transform: translateX(70px) scale(0.94);
    filter: blur(14px) drop-shadow(0 0 0 transparent);
  }
  65% {
    opacity: 0.92;
    transform: translateX(-3px) scale(1.02);
    filter: blur(1px) drop-shadow(0 0 20px rgba(93, 225, 230, 0.6));
  }
  100% {
    opacity: 1;
    transform: translateX(0) scale(1);
    filter: blur(0px) drop-shadow(0 8px 30px rgba(167, 120, 255, 0.4));
  }
}

@keyframes rainbowRefractionSheen {
  0% {
    filter: hue-rotate(0deg) drop-shadow(0 0 20px rgba(93, 225, 230, 0.4));
  }
  50% {
    filter: hue-rotate(25deg) drop-shadow(0 0 35px rgba(167, 120, 255, 0.5));
  }
  100% {
    filter: hue-rotate(-20deg) drop-shadow(0 0 25px rgba(52, 139, 255, 0.4));
  }
}

@keyframes fadeInBelow {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes prismRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
}

/* 支持 prefers-reduced-motion: 关闭动效保证无障碍体验 */
@media (prefers-reduced-motion: reduce) {
  .logo-entrance-block,
  .logo-prism-crystal,
  .logo-tagline,
  .prism-metrics-grid,
  .brand-icon-prism::before,
  .prism-refract-frame::before {
    animation: none !important;
    transform: none !important;
    filter: none !important;
    opacity: 1 !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* 分区公共头部 */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px;
}

.section-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary-ice-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3.2vw, 2.4rem);
  font-weight: 700;
  color: var(--text-glass-white);
  line-height: 1.3;
  margin-bottom: 16px;
}

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

/* Section 基础间距 */
.py-section {
  padding: 85px 0;
}

/* C. Prism 优势展示区 (错落 Bento 网格) */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bento-span-2 {
  grid-column: span 2;
}

.bento-span-1 {
  grid-column: span 1;
}

.bento-card {
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bento-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.bento-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(93, 225, 230, 0.15), rgba(167, 120, 255, 0.2));
  border: 1px solid rgba(93, 225, 230, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-ice-cyan);
}

.bento-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50px;
  color: var(--primary-rainbow-purple);
}

.bento-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 12px;
}

.bento-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.bento-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-main);
}

.bento-bullet-item svg {
  width: 16px;
  height: 16px;
  color: var(--primary-ice-cyan);
  flex-shrink: 0;
  margin-top: 4px;
}

/* D. 网络使用场景 */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.scenario-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.scenario-icon-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.scenario-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(52, 139, 255, 0.15);
  border: 1px solid rgba(52, 139, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-aurora-blue);
}

.scenario-tag {
  font-size: 0.75rem;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.04);
  padding: 3px 8px;
  border-radius: 4px;
}

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

.scenario-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
  flex-grow: 1;
}

.scenario-factors {
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
  line-height: 1.55;
}

/* E. 套餐价格 (Prism Glass 价格卡片) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.popular {
  border-color: rgba(93, 225, 230, 0.45);
  background: rgba(14, 34, 71, 0.78);
  box-shadow: 0 16px 48px rgba(7, 21, 45, 0.9), 0 0 35px rgba(93, 225, 230, 0.25);
  transform: scale(1.02);
}

.pricing-badge-popular {
  position: absolute;
  top: 16px;
  right: 20px;
  background: linear-gradient(135deg, #5DE1E6, #A778FF);
  color: #07152D;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 50px;
  box-shadow: 0 2px 10px rgba(93, 225, 230, 0.4);
}

.plan-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 6px;
}

.plan-target {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.5;
  min-height: 42px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.plan-currency {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-ice-cyan);
}

.plan-price-num {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-glass-white);
  letter-spacing: -0.03em;
  line-height: 1;
}

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

.plan-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-main);
}

.spec-item svg {
  width: 17px;
  height: 17px;
  color: var(--primary-ice-cyan);
  flex-shrink: 0;
  margin-top: 3px;
}

.plan-note {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 14px;
}

.pricing-disclaimer-box {
  margin-top: 36px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
}

/* F. 文章专区 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.article-category {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(93, 225, 230, 0.12);
  color: var(--primary-ice-cyan);
  border: 1px solid rgba(93, 225, 230, 0.25);
}

.article-date {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-card-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-glass-white);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

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

.article-card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.article-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

.reading-time {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-read-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-ice-cyan);
  text-decoration: none;
  transition: gap 0.2s ease;
}

.article-read-link:hover {
  gap: 10px;
  color: var(--text-glass-white);
}

/* G. 用户评价 (真实典型使用场景实践反馈体系) */
.reviews-section {
  position: relative;
}

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

.practice-card {
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: var(--radius-lg);
  position: relative;
}

.practice-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.plan-pill-tag {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-glass-white);
  letter-spacing: 0.02em;
}

.star-rating {
  color: #FF5E7E;
  font-size: 1.15rem;
  letter-spacing: 2px;
  line-height: 1;
}

.practice-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 14px;
  line-height: 1.4;
}

.practice-quote {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 22px;
  flex-grow: 1;
}

.practice-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.practice-tag {
  font-size: 0.78rem;
  color: var(--primary-ice-cyan);
  background: rgba(93, 225, 230, 0.08);
  border: 1px solid rgba(93, 225, 230, 0.2);
  padding: 3px 10px;
  border-radius: 6px;
}

.practice-user-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.practice-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #FFFFFF;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

.practice-user-info {
  display: flex;
  flex-direction: column;
}

.practice-user-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-glass-white);
  line-height: 1.35;
}

.practice-user-sub {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 2px;
}

/* H. 常见问题 (FAQ 折叠组件，无障碍友好) */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.faq-item.active {
  border-color: rgba(93, 225, 230, 0.4);
  box-shadow: 0 4px 20px rgba(7, 21, 45, 0.5);
}

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

.faq-question-btn:hover {
  color: var(--primary-ice-cyan);
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--primary-ice-cyan);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-answer-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer-panel {
  max-height: 500px;
  padding: 0 24px 22px;
}

/* I. 页脚 (Footer) */
.site-footer {
  background: rgba(4, 13, 29, 0.95);
  border-top: 1px solid rgba(243, 248, 255, 0.08);
  padding: 70px 0 35px;
  margin-top: 60px;
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

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

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-bottom-row {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

/* ==========================================================================
   文章详情页独立样式 (Article Detail Page)
   ========================================================================== */
.article-header-area {
  padding: 50px 0 30px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.breadcrumb-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb-link:hover {
  color: var(--primary-ice-cyan);
}

.article-title-main {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-glass-white);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  font-size: 0.88rem;
  color: var(--text-dim);
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 32px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* GEO 直接回答高亮卡片 (Direct Answer Snippet) */
.direct-answer-card {
  background: rgba(93, 225, 230, 0.08);
  border: 1px solid rgba(93, 225, 230, 0.35);
  border-left: 4px solid var(--primary-ice-cyan);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.direct-answer-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary-ice-cyan);
  margin-bottom: 10px;
}

.direct-answer-text {
  font-size: 1.05rem;
  color: var(--text-glass-white);
  line-height: 1.75;
}

/* 文章主体布局：正文 + 侧边栏 TOC */
.article-layout-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

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

.article-content-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  scroll-margin-top: 90px;
}

.article-content-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-ice-cyan);
  margin: 28px 0 14px;
  scroll-margin-top: 90px;
}

.article-content-body p {
  margin-bottom: 20px;
  white-space: pre-line;
}

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

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

/* 文章数据对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 32px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.article-table th {
  background: rgba(14, 34, 71, 0.9);
  color: var(--primary-ice-cyan);
  padding: 14px 18px;
  font-weight: 600;
  border-bottom: 1px solid rgba(93, 225, 230, 0.2);
  white-space: nowrap;
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.article-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* 文章内总结卡片 */
.article-conclusion-box {
  background: rgba(167, 120, 255, 0.08);
  border: 1px solid rgba(167, 120, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 40px 0;
}

.conclusion-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-rainbow-purple);
  margin-bottom: 10px;
}

/* 侧边栏 TOC 目录 */
.article-sidebar {
  position: sticky;
  top: 92px;
}

.toc-card {
  padding: 24px;
}

.toc-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.toc-link {
  font-size: 0.88rem;
  color: var(--text-muted);
  text-decoration: none;
  line-height: 1.45;
  transition: color 0.2s ease;
  display: block;
}

.toc-link:hover, .toc-link.active {
  color: var(--primary-ice-cyan);
  padding-left: 4px;
}

.sidebar-cta-card {
  margin-top: 24px;
  padding: 24px;
  text-align: center;
}

.sidebar-cta-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 10px;
}

.sidebar-cta-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

/* 相关推荐文章卡片 */
.related-articles-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.related-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-glass-white);
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* 404 页面专用 */
.error-page-wrap {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-prism-card {
  max-width: 580px;
  padding: 50px 40px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, #5DE1E6, #A778FF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

/* ==========================================================================
   响应式断点适配 (375px, 768px, 1024px, 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta-group, .hero-trust-row {
    justify-content: center;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 540px;
    margin: 0 auto;
  }
  
  .pricing-card.popular {
    transform: none;
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
  }
  
  .bento-span-2, .bento-span-1 {
    grid-column: span 1;
  }
  
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 580px;
    margin: 0 auto;
  }
  
  .article-layout-grid {
    grid-template-columns: 1fr;
  }
  
  .article-sidebar {
    display: none;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .desktop-nav, .header-action-btn {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .py-section {
    padding: 60px 0;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-bottom-row {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  
  .btn {
    width: 100%;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .prism-refract-frame {
    padding: 24px 18px;
  }
  
  .logo-prism-crystal {
    width: 86px;
    height: 86px;
  }
  
  .logo-prism-crystal svg {
    width: 48px;
    height: 48px;
  }
  
  .pricing-card {
    padding: 30px 20px;
  }
}