/* ===================================================================
   良心云官网落地页 - 精品现代SaaS视觉设计系统
   域名: liangxinyunjc.click
   设计灵感: 图1现代网格浮动卡片 + 图2三列差异化套餐定价 + 动态微动科技质感
   =================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* 主题色彩 */
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #eef2ff;
  --color-secondary: #008ba3;
  --color-secondary-dark: #007085;
  --color-accent-cyan: #06b6d4;
  --color-accent-blue: #3b82f6;
  --color-dark: #0f172a;
  --color-dark-card: #1e293b;
  --color-text-main: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-bg-base: #f8fafc;
  --color-card-bg: #ffffff;
  --color-border: #e2e8f0;
  --color-border-glow: rgba(99, 102, 241, 0.25);
  
  /* 阴影层级 */
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 20px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 20px 45px -10px rgba(15, 23, 42, 0.1);
  --shadow-glow: 0 0 35px -5px rgba(79, 70, 229, 0.3);
  --shadow-card-pop: 0 25px 50px -12px rgba(0, 139, 163, 0.35);
  
  /* 动效 */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

html {
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: #fbfcfe;
}

/* 动态科技网格背景 (还原图1的精美网格与微动光斑) */
.grid-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  background-image: 
    linear-gradient(to right, rgba(99, 102, 241, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(99, 102, 241, 0.06) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse at 50% 20%, black 50%, transparent 95%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 20%, black 50%, transparent 95%);
}

/* 浮动光晕球点缀 */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  animation: floatOrb 12s ease-in-out infinite alternate;
}

.ambient-glow-1 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.35), transparent 70%);
  top: -100px;
  left: 10%;
}

.ambient-glow-2 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.3), transparent 70%);
  top: 25%;
  right: 5%;
  animation-duration: 16s;
  animation-delay: -4s;
}

.ambient-glow-3 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.25), transparent 70%);
  bottom: 5%;
  left: 20%;
  animation-duration: 18s;
  animation-delay: -7s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.08); }
  100% { transform: translate(-30px, 40px) scale(0.95); }
}

/* 全局版心 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 顶部通知条 / 动态警示 */
.top-notice-bar {
  background: linear-gradient(90deg, #4f46e5 0%, #06b6d4 100%);
  color: #ffffff;
  font-size: 13.5px;
  padding: 8px 16px;
  text-align: center;
  font-weight: 500;
  position: relative;
  z-index: 50;
  box-shadow: 0 2px 10px rgba(79, 70, 229, 0.2);
}

.top-notice-bar a {
  color: #ffffff;
  text-decoration: underline;
  margin-left: 8px;
  font-weight: 700;
}

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  font-size: 20px;
  color: var(--color-dark);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, #3b82f6 0%, #008ba3 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 6px 14px rgba(59, 130, 246, 0.35);
  transition: transform var(--transition-fast);
}

.nav-brand:hover .brand-icon {
  transform: rotate(6deg) scale(1.05);
}

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

.nav-links a {
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width var(--transition-fast);
}

.nav-links a:hover::after {
  width: 100%;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #4338ca 0%, #4f46e5 100%);
  box-shadow: 0 8px 25px rgba(79, 70, 229, 0.45);
  transform: translateY(-2px);
}

.btn-secondary {
  background: #ffffff;
  color: var(--color-text-main);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
  transform: translateY(-2px);
}

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

.btn-glow::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -60%;
  width: 200%;
  height: 200%;
  background: linear-gradient(60deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: rotate(30deg);
  animation: shineSweep 4s infinite ease-in-out;
}

@keyframes shineSweep {
  0% { transform: translateX(-100%) rotate(30deg); }
  35%, 100% { transform: translateX(120%) rotate(30deg); }
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13.5px;
  border-radius: 9px;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16.5px;
  border-radius: 14px;
}

/* Hero 首屏 */
.hero-section {
  padding: 70px 0 60px;
  text-align: center;
  position: relative;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.2);
  color: var(--color-primary);
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 50px;
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--color-dark);
  margin-bottom: 20px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #3b82f6 0%, #4f46e5 50%, #008ba3 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 18.5px;
  color: var(--color-text-muted);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.hero-features-chips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--color-text-muted);
}

.chip-item {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.7);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--color-border);
}

.chip-item svg {
  color: #10b981;
}

/* 图1风格精髓浮动展示卡片 (Floating Showcase Card) */
.hero-floating-card-wrapper {
  margin: 50px auto 30px;
  max-width: 860px;
  position: relative;
}

.floating-main-card {
  background: #ffffff;
  border-radius: 28px;
  padding: 40px;
  border: 1px solid rgba(226, 232, 240, 0.85);
  box-shadow: 0 30px 60px -15px rgba(15, 23, 42, 0.08), 0 0 1px rgba(0, 0, 0, 0.06);
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  text-align: left;
  align-items: center;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.floating-main-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 35px 70px -15px rgba(15, 23, 42, 0.12);
}

/* 顶部色彩渐变条（还原图1卡片底部的微光彩条） */
.card-accent-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, #6366f1 0%, #06b6d4 50%, #3b82f6 100%);
}

/* 图1风格浮动微拟物组件 */
.card-badge-icon {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(135deg, #3b82f6 0%, #008ba3 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-bottom: 20px;
  box-shadow: 0 10px 22px rgba(59, 130, 246, 0.35);
  animation: gentlePulse 3s ease-in-out infinite alternate;
}

@keyframes gentlePulse {
  0% { transform: translateY(0); }
  100% { transform: translateY(-4px); }
}

.card-title-lg {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.card-subtitle {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.floating-spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  background: #f8fafc;
  padding: 20px;
  border-radius: 18px;
  border: 1px solid #e2e8f0;
}

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

.spec-number {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-primary);
}

.spec-label {
  font-size: 12.5px;
  color: var(--color-text-muted);
}

/* 卡片右侧快捷入口仪表盘演示 */
.dashboard-preview-card {
  background: #0f172a;
  border-radius: 20px;
  padding: 24px;
  color: #ffffff;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.1), 0 20px 30px rgba(15, 23, 42, 0.25);
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.preview-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #34d399;
}

.preview-pill {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #34d399;
}

.preview-node-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview-node {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}

.node-flag {
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-ping {
  color: #10b981;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
}

/* Section 通用标题 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 55px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: rgba(79, 70, 229, 0.08);
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 14px;
  letter-spacing: -0.015em;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===================================================================
   图2 套餐价格 (Pricing Cards) - 像素级特色还原
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border-radius: 24px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05);
  display: flex;
  flex-direction: column;
  padding: 36px 30px;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 45px -10px rgba(15, 23, 42, 0.12);
}

/* 特色中位卡片 (图2冲浪包月高亮青色款) */
.pricing-card-featured {
  background: linear-gradient(180deg, #008ba3 0%, #007489 100%) !important;
  color: #ffffff !important;
  border: none !important;
  box-shadow: var(--shadow-card-pop) !important;
  transform: scale(1.04);
  z-index: 2;
}

.pricing-card-featured:hover {
  transform: scale(1.05) translateY(-8px) !important;
}

.pricing-card-featured .plan-name,
.pricing-card-featured .plan-price,
.pricing-card-featured .price-currency,
.pricing-card-featured .price-cycle,
.pricing-card-featured .feature-text {
  color: #ffffff !important;
}

.pricing-card-featured .feature-icon svg {
  color: #67e8f9 !important;
}

.pricing-card-featured .plan-divider {
  background: rgba(255, 255, 255, 0.2) !important;
}

.pricing-card-featured .btn-plan {
  background: #0f172a !important;
  color: #ffffff !important;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25) !important;
}

.pricing-card-featured .btn-plan:hover {
  background: #020617 !important;
}

/* 推荐小角标 */
.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: #f59e0b;
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
  letter-spacing: 0.04em;
}

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

.plan-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.plan-traffic-badge {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(0, 139, 163, 0.1);
  color: var(--color-secondary);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
}

.pricing-card-featured .plan-traffic-badge {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  margin: 18px 0 12px;
}

.price-currency {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-secondary);
  margin-right: 4px;
}

.plan-price {
  font-size: 46px;
  font-weight: 900;
  color: var(--color-secondary);
  letter-spacing: -0.03em;
}

.price-cycle {
  font-size: 14.5px;
  color: var(--color-text-muted);
  margin-left: 6px;
}

.plan-divider {
  height: 1px;
  background: #e2e8f0;
  margin: 20px 0;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
}

.feature-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-icon svg {
  color: #10b981;
}

.feature-text {
  color: var(--color-text-main);
  font-weight: 500;
}

.btn-plan {
  width: 100%;
  padding: 13px 20px;
  background: #0f172a;
  color: #ffffff !important;
  border-radius: 12px;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
  transition: all var(--transition-fast);
}

.btn-plan:hover {
  background: #1e293b;
  transform: translateY(-2px);
}

/* 核心特性网格 (Core Features) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-box {
  background: #ffffff;
  border-radius: 20px;
  padding: 32px;
  border: 1px solid #e2e8f0;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-box:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.3);
}

.feature-box-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(6, 182, 212, 0.15) 100%);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: transform var(--transition-fast);
}

.feature-box:hover .feature-box-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-box-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.feature-box-desc {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* 客户端支持 (Clients Section) */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: #ffffff;
  border-radius: 18px;
  border: 1px solid #e2e8f0;
  padding: 24px;
  text-align: center;
  transition: all var(--transition-normal);
}

.client-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.client-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f1f5f9;
  border-radius: 14px;
  color: var(--color-dark);
}

.client-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.client-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.client-tags {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}

.client-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  color: #475569;
}

/* AI工具专项加速卡片 */
.ai-section {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  border-radius: 28px;
  padding: 60px;
  color: #ffffff;
  margin: 40px 0;
  box-shadow: 0 25px 60px rgba(15, 23, 42, 0.4);
  position: relative;
  overflow: hidden;
}

.ai-section::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.35), transparent 70%);
  pointer-events: none;
}

.ai-content {
  position: relative;
  z-index: 1;
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.ai-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 22px;
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.ai-card:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.25);
}

.ai-card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-card-desc {
  font-size: 13px;
  color: #94a3b8;
  line-height: 1.5;
}

/* FAQ 手风琴样式 */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.faq-item.active {
  border-color: var(--color-primary);
  box-shadow: 0 8px 25px -5px rgba(79, 70, 229, 0.1);
}

.faq-question {
  padding: 20px 24px;
  font-weight: 700;
  font-size: 16px;
  color: var(--color-dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-toggle-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
  color: var(--color-text-muted);
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  font-size: 15px;
  color: #475569;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 800px;
  padding: 0 24px 22px;
}

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

.article-card {
  background: #ffffff;
  border-radius: 20px;
  border: 1px solid #e2e8f0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

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

.article-thumb-placeholder {
  height: 160px;
  background: linear-gradient(135deg, #e0e7ff 0%, #cffafe 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.article-category {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(4px);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--color-primary);
}

.article-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-title {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

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

.article-snippet {
  font-size: 13.5px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--color-text-light);
  border-top: 1px solid #f1f5f9;
  padding-top: 14px;
}

/* 文章详情页专用排版 (Article Detail Page) */
.article-container {
  max-width: 860px;
  margin: 40px auto 80px;
  background: #ffffff;
  border-radius: 24px;
  border: 1px solid #e2e8f0;
  box-shadow: var(--shadow-md);
  padding: 48px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 28px;
}

.article-main-title {
  font-size: 34px;
  font-weight: 900;
  color: var(--color-dark);
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
}

.article-info-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 13.5px;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.article-banner-cta {
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
  border: 1px solid #c7d2fe;
  border-radius: 16px;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 36px;
}

.article-banner-cta h4 {
  font-size: 17px;
  color: #1e1b4b;
  margin-bottom: 4px;
}

.article-banner-cta p {
  font-size: 13.5px;
  color: #4338ca;
}

.article-content {
  font-size: 16px;
  line-height: 1.85;
  color: #334155;
}

.article-content h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-dark);
  margin: 40px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul,
.article-content ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

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

.article-content strong {
  color: #0f172a;
}

.article-content blockquote {
  background: #f8fafc;
  border-left: 4px solid var(--color-secondary);
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 24px 0;
  color: #475569;
  font-style: italic;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14.5px;
}

.article-content th,
.article-content td {
  border: 1px solid #e2e8f0;
  padding: 12px 16px;
  text-align: left;
}

.article-content th {
  background: #f1f5f9;
  font-weight: 700;
  color: var(--color-dark);
}

.article-content tr:nth-child(even) {
  background: #f8fafc;
}

/* 文章内部相互链接推荐卡片 */
.internal-links-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 24px;
  margin: 40px 0;
}

.internal-links-box h4 {
  font-size: 17px;
  color: var(--color-dark);
  margin-bottom: 14px;
}

.internal-links-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.internal-links-list a {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 14.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.internal-links-list a:hover {
  text-decoration: underline;
}

/* 浮动行动召唤条 (Floating Quick Entrance Bar) */
.quick-action-dock {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 10px 24px;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  animation: floatDock 4s ease-in-out infinite alternate;
}

@keyframes floatDock {
  0% { transform: translateX(-50%) translateY(0); }
  100% { transform: translateX(-50%) translateY(-5px); }
}

.dock-text {
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dock-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
}

/* 页脚 (Footer) */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px;
  margin-top: 60px;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-title {
  color: #ffffff;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  max-width: 320px;
  margin-bottom: 20px;
}

.footer-heading {
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 18px;
}

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

.footer-nav a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: #64748b;
  flex-wrap: wrap;
  gap: 16px;
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  .pricing-card-featured {
    transform: none !important;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid,
  .ai-grid,
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .floating-main-card {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 34px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .features-grid,
  .clients-grid,
  .ai-grid,
  .articles-grid,
  .internal-links-list {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 24px;
  }
  .article-main-title {
    font-size: 26px;
  }
  .quick-action-dock {
    width: 90%;
    justify-content: space-between;
    padding: 10px 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}