/* ===================================================================
   KENDEJI.BUZZ - 肯德基机场网官方落地页与知识库样式表
   纯原生 CSS3 架构 | 零外部依赖 | 极致秒开 | 硬件加速动态背景
   =================================================================== */

:root {
  --bg-primary: #070a13;
  --bg-secondary: #0d1322;
  --bg-card: rgba(18, 24, 38, 0.72);
  --bg-card-hover: rgba(28, 38, 60, 0.88);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 23, 68, 0.35);
  
  --primary: #ff1744;
  --primary-light: #ff5252;
  --secondary: #ff9100;
  --accent-cyan: #00e5ff;
  --accent-green: #00e676;
  
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  
  --container-max: 1240px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(255, 23, 68, 0.35);
  --shadow-glow-cyan: 0 0 25px rgba(0, 229, 255, 0.25);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

/* ===================================================================
   原生动态光效背景 (纯 CSS 硬件加速，零 JS，秒开无负担)
   =================================================================== */
.dynamic-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.aurora-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.38;
  will-change: transform;
}

.orb-1 {
  top: -10%;
  left: 15%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #ff1744 0%, rgba(255, 82, 82, 0) 70%);
  animation: floatOrb1 18s ease-in-out infinite alternate;
}

.orb-2 {
  top: 30%;
  right: -5%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, #ff9100 0%, rgba(255, 145, 0, 0) 70%);
  animation: floatOrb2 22s ease-in-out infinite alternate;
}

.orb-3 {
  bottom: -10%;
  left: 20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #00e5ff 0%, rgba(0, 229, 255, 0) 70%);
  animation: floatOrb3 20s ease-in-out infinite alternate;
}

.cyber-grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 60%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 60%, transparent 100%);
}

@keyframes floatOrb1 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(80px, 60px, 0) scale(1.15); }
  100% { transform: translate3d(-40px, 90px, 0) scale(0.95); }
}

@keyframes floatOrb2 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-100px, -70px, 0) scale(1.1); }
  100% { transform: translate3d(40px, -40px, 0) scale(0.9); }
}

@keyframes floatOrb3 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(90px, -80px, 0) scale(1.12); }
  100% { transform: translate3d(-70px, 30px, 0) scale(0.92); }
}

/* ===================================================================
   各种各样动态肯の机炸鸡腿漂浮背景 (萌趣肯の机炸鸡腿/墨镜鸭/泳圈鸭/竹蜻蜓鸭/赛博鸭/火箭鸭)
   纯 CSS3 硬件加速 | 零外部 JS 依赖 | 秒开流畅 60FPS
   =================================================================== */
.duck-item,
.chicken-leg-item {
  position: absolute;
  pointer-events: none;
  user-select: none;
  will-change: transform;
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.65)) drop-shadow(0 0 12px rgba(255, 235, 59, 0.28));
  transition: opacity 0.3s ease;
}

/* 错峰漂浮轨迹与浮动微摇摆动力学 */
.float-track-1 {
  animation: floatDrumstick1 16s ease-in-out infinite alternate;
}
.float-track-2 {
  animation: floatDrumstick2 20s ease-in-out infinite alternate;
}
.float-track-3 {
  animation: floatDrumstick3 24s ease-in-out infinite alternate;
}
.float-track-4 {
  animation: floatDrumstick4 18s ease-in-out infinite alternate;
}
.float-track-5 {
  animation: floatDrumstick5 22s ease-in-out infinite alternate;
}
.float-track-6 {
  animation: floatDrumstick6 26s ease-in-out infinite alternate;
}

@keyframes floatDrumstick1 {
  0% { transform: translate3d(0, 0, 0) rotate(6deg) scale(1); }
  50% { transform: translate3d(28px, -40px, 0) rotate(-10deg) scale(1.06); }
  100% { transform: translate3d(-22px, -80px, 0) rotate(14deg) scale(0.96); }
}

@keyframes floatDrumstick2 {
  0% { transform: translate3d(0, 0, 0) rotate(-12deg) scale(0.96); }
  50% { transform: translate3d(-32px, -50px, 0) rotate(10deg) scale(1.08); }
  100% { transform: translate3d(18px, -90px, 0) rotate(-6deg) scale(1); }
}

@keyframes floatDrumstick3 {
  0% { transform: translate3d(0, 0, 0) rotate(15deg) scale(1); }
  50% { transform: translate3d(35px, -35px, 0) rotate(-5deg) scale(1.05); }
  100% { transform: translate3d(-15px, -70px, 0) rotate(20deg) scale(0.95); }
}

@keyframes floatDrumstick4 {
  0% { transform: translate3d(0, 0, 0) rotate(-8deg) scale(1.04); }
  50% { transform: translate3d(-25px, 40px, 0) rotate(14deg) scale(0.96); }
  100% { transform: translate3d(28px, 80px, 0) rotate(-16deg) scale(1.05); }
}

@keyframes floatDrumstick5 {
  0% { transform: translate3d(0, 0, 0) rotate(5deg) scale(0.94); }
  50% { transform: translate3d(32px, -55px, 0) rotate(-16deg) scale(1.1); }
  100% { transform: translate3d(-28px, -95px, 0) rotate(10deg) scale(0.96); }
}

@keyframes floatDrumstick6 {
  0% { transform: translate3d(0, 0, 0) rotate(-20deg) scale(1); }
  50% { transform: translate3d(-20px, 45px, 0) rotate(6deg) scale(1.06); }
  100% { transform: translate3d(22px, 85px, 0) rotate(-10deg) scale(0.94); }
}

/* 兼容别名 */
@keyframes floatChicken1 { 0% { transform: translate3d(0,0,0) rotate(6deg); } 100% { transform: translate3d(-22px,-80px,0) rotate(14deg); } }
@keyframes floatChicken2 { 0% { transform: translate3d(0,0,0) rotate(-12deg); } 100% { transform: translate3d(18px,-90px,0) rotate(-6deg); } }
@keyframes floatChicken3 { 0% { transform: translate3d(0,0,0) rotate(15deg); } 100% { transform: translate3d(-15px,-70px,0) rotate(20deg); } }
@keyframes floatChicken4 { 0% { transform: translate3d(0,0,0) rotate(-8deg); } 100% { transform: translate3d(28px,80px,0) rotate(-16deg); } }
@keyframes floatChicken5 { 0% { transform: translate3d(0,0,0) rotate(5deg); } 100% { transform: translate3d(-28px,-95px,0) rotate(10deg); } }
@keyframes floatChicken6 { 0% { transform: translate3d(0,0,0) rotate(-20deg); } 100% { transform: translate3d(22px,85px,0) rotate(-10deg); } }

/* ===================================================================
   布局与容器
   =================================================================== */
.page-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(255, 23, 68, 0.12);
  border: 1px solid rgba(255, 23, 68, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary-light);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.badge-tag .pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.75); }
}

.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.65;
}

.text-gradient {
  background: linear-gradient(135deg, #ff1744 0%, #ff9100 50%, #00e5ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ===================================================================
   导航栏 Header
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 10, 19, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  background: #f6ecf7;
  border-radius: 12px;
  padding: 3px 10px 3px 6px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.logo-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(184, 41, 227, 0.45);
}

.logo-img {
  height: 40px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width 0.25s ease;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ===================================================================
   通用按钮规范 (严格满足 CTA nofollow 与 target="_blank")
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #ff1744 0%, #ff5252 50%, #ff9100 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(255, 23, 68, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 23, 68, 0.65);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ===================================================================
   Hero 头部首屏
   =================================================================== */
.hero-section {
  padding: 90px 0 70px 0;
  text-align: center;
}

.hero-content {
  max-width: 920px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  font-size: 0.9rem;
  color: #e2e8f0;
  margin-bottom: 24px;
}

.hero-pill-badge {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #ffffff;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: clamp(2.3rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 780px;
  margin: 0 auto 36px auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 48px;
}

.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 24px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  margin-top: 20px;
}

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

.stat-value {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.stat-value .highlight {
  color: var(--accent-cyan);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================================================================
   核心优势卡片
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s ease;
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 23, 68, 0.4);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

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

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(255, 23, 68, 0.1);
  border: 1px solid rgba(255, 23, 68, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.6rem;
  color: var(--primary-light);
}

.feature-icon-box.cyan {
  background: rgba(0, 229, 255, 0.1);
  border-color: rgba(0, 229, 255, 0.25);
  color: var(--accent-cyan);
}

.feature-icon-box.orange {
  background: rgba(255, 145, 0, 0.1);
  border-color: rgba(255, 145, 0, 0.25);
  color: var(--secondary);
}

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

.feature-card-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===================================================================
   节点网络展示
   =================================================================== */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.node-card:hover {
  border-color: rgba(0, 229, 255, 0.35);
  transform: translateY(-3px);
  background: var(--bg-card-hover);
}

.node-info-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag {
  font-size: 1.7rem;
}

.node-name {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text-primary);
}

.node-spec {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-status-right {
  text-align: right;
}

.node-ping {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-green);
}

.node-online-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
  margin-right: 4px;
}

/* ===================================================================
   ★ 套餐价格区域：严格要求【所有价格同排】(Desktop Same-Row Layout)
   =================================================================== */
.pricing-section {
  padding: 80px 0;
  background: linear-gradient(180deg, transparent, rgba(13, 19, 34, 0.6) 50%, transparent);
}

.pricing-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.3s ease;
  backdrop-filter: blur(16px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 23, 68, 0.45);
  box-shadow: var(--shadow-glow);
}

.pricing-card.featured {
  background: rgba(26, 20, 36, 0.85);
  border: 2px solid var(--primary);
  box-shadow: 0 10px 35px rgba(255, 23, 68, 0.28);
  transform: translateY(-6px);
}

.pricing-card.featured:hover {
  transform: translateY(-12px);
  box-shadow: 0 16px 45px rgba(255, 23, 68, 0.5);
}

.pricing-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #ff1744, #ff9100);
  color: #ffffff;
  padding: 3px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.plan-header {
  text-align: center;
  margin-bottom: 22px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.plan-tier-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.plan-sub-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
  margin: 16px 0 4px 0;
}

.price-currency {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary-light);
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--text-primary);
  line-height: 1;
}

.price-billing-cycle {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.price-average-tag {
  font-size: 0.82rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-top: 4px;
}

.plan-features-list {
  flex-grow: 1;
  margin-bottom: 26px;
}

.plan-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: #cbd5e1;
  margin-bottom: 12px;
  line-height: 1.45;
}

.plan-features-list li .icon-check {
  color: var(--accent-green);
  font-weight: 800;
  flex-shrink: 0;
}

.plan-cta-wrap {
  margin-top: auto;
}

/* ===================================================================
   文章推荐区域 (机场知识库)
   =================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  backdrop-filter: blur(14px);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

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

.article-tag {
  padding: 2px 10px;
  background: rgba(0, 229, 255, 0.1);
  color: var(--accent-cyan);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.75rem;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-primary);
  transition: color 0.2s ease;
}

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

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-readmore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.article-readmore:hover {
  color: #ffffff;
  gap: 10px;
}

/* ===================================================================
   用户真实评价
   =================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.16);
}

.testimonial-rating {
  color: #ffb703;
  margin-bottom: 12px;
  font-size: 1.05rem;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 0.92rem;
  color: #e2e8f0;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #ffffff;
}

.author-info-name {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-info-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================================
   常见问题 FAQ (原生 details/summary 实现，零 JS 极速交互)
   =================================================================== */
.faq-accordion-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
  backdrop-filter: blur(14px);
}

.faq-item[open] {
  border-color: rgba(255, 23, 68, 0.4);
  background: rgba(24, 32, 50, 0.85);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: transform 0.25s ease, color 0.25s ease;
}

.faq-item[open] .faq-question::after {
  content: '−';
  color: var(--primary-light);
}

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

.faq-answer strong {
  color: var(--text-primary);
}

/* ===================================================================
   友情链接与外部权威参考 (高质量外链)
   =================================================================== */
.backlinks-section {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  background: rgba(7, 10, 19, 0.5);
}

.backlinks-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px 24px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.backlinks-title {
  font-weight: 700;
  color: var(--text-muted);
}

.backlink-item {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.backlink-item:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* ===================================================================
   底部 Footer
   =================================================================== */
.site-footer {
  background: #05070e;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-top: 16px;
  line-height: 1.65;
  max-width: 380px;
}

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

.footer-links-list li {
  margin-bottom: 10px;
}

.footer-links-list a {
  color: var(--text-secondary);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-geo-tags {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================================
   文章内页排版专属样式 (Article Single Page)
   =================================================================== */
.article-header {
  padding: 60px 0 30px 0;
  text-align: center;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
}

.breadcrumb-nav a:hover {
  color: var(--primary-light);
}

.article-hero-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.article-post-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.article-body-wrapper {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 20px 80px 20px;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 40px 0 18px 0;
  color: #ffffff;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 28px 0 14px 0;
  color: #f1f5f9;
}

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

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 10px;
  line-height: 1.7;
}

.article-content strong {
  color: #ffffff;
  font-weight: 700;
}

.article-toc {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0 36px 0;
}

.article-toc-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--accent-cyan);
}

.article-toc ul {
  list-style: none;
  margin: 0;
  padding-left: 10px;
}

.article-toc li {
  margin-bottom: 8px;
  font-size: 0.92rem;
}

.article-toc a {
  color: var(--text-secondary);
}

.article-toc a:hover {
  color: var(--primary-light);
  text-decoration: underline;
}

.article-callout {
  background: rgba(255, 23, 68, 0.08);
  border-left: 4px solid var(--primary);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
  color: #f8fafc;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(255, 23, 68, 0.15), rgba(0, 229, 255, 0.1));
  border: 1px solid rgba(255, 23, 68, 0.35);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  text-align: center;
  margin: 48px 0;
}

.article-cta-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.article-cta-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 24px auto;
}

/* ===================================================================
   响应式断点适配 (Desktop 强制同排，移动端流式自适应)
   =================================================================== */
@media (max-width: 1080px) {
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 保证在桌面端同排展示 4 个价格卡片 */
@media (min-width: 901px) {
  .pricing-row {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 900px) {
  .pricing-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav-links {
    display: none; /* 移动端精简模式 */
  }
}

@media (max-width: 640px) {
  .section {
    padding: 55px 0;
  }
  .hero-stats-bar {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-row {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .nodes-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}