/* ===================================================================
   一分机场 (yifenyun.click) - 全局核心样式表
   设计风格：玻璃拟态 (Glassmorphism) + 深墨绿/极光翡翠荧光霓虹 + 现代科技感
   =================================================================== */

:root {
  --bg-primary: #060e0a;
  --bg-secondary: #0a1812;
  --bg-card: rgba(13, 29, 23, 0.65);
  --bg-card-hover: rgba(18, 40, 32, 0.82);
  --bg-glass: rgba(20, 48, 38, 0.45);
  
  --border-glass: rgba(82, 222, 169, 0.16);
  --border-glass-hover: rgba(82, 222, 169, 0.45);
  --border-glow: rgba(94, 236, 179, 0.5);

  --accent-primary: #4ee6a8;
  --accent-secondary: #2bd896;
  --accent-glow: rgba(78, 230, 168, 0.35);
  --accent-cyan: #22d3ee;
  --accent-yellow: #fbbf24;

  --text-main: #f0fdf4;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-emerald: #86efac;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --shadow-glow: 0 0 25px rgba(78, 230, 168, 0.28);
  --shadow-glow-lg: 0 0 45px rgba(78, 230, 168, 0.45);

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Playfair Display", "Songti SC", Georgia, serif;
}

/* 基础重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
}

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at 18% 18%, rgba(20, 60, 42, 0.7) 0%, rgba(6, 14, 10, 0.98) 50%, #050a07 100%),
              radial-gradient(circle at 85% 75%, rgba(14, 45, 34, 0.6) 0%, transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 动态背景环境光球 */
.ambient-glow-1 {
  position: fixed;
  top: -150px;
  left: -150px;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(78, 230, 168, 0.18) 0%, transparent 70%);
  filter: blur(80px);
  z-index: -1;
  pointer-events: none;
  animation: floatAmbient 18s ease-in-out infinite alternate;
}

.ambient-glow-2 {
  position: fixed;
  bottom: 5%;
  right: -100px;
  width: 650px;
  height: 650px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.14) 0%, transparent 70%);
  filter: blur(100px);
  z-index: -1;
  pointer-events: none;
  animation: floatAmbient 22s ease-in-out infinite alternate-reverse;
}

@keyframes floatAmbient {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.1); }
  100% { transform: translate(-30px, 80px) scale(0.95); }
}

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

ul, ol {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 玻璃拟态基础卡片 */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(94, 236, 179, 0.4), transparent);
  pointer-events: none;
}

.glass-panel:hover {
  border-color: var(--border-glass-hover);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.45), 0 0 20px rgba(78, 230, 168, 0.15);
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #4ee6a8 0%, #2bd896 100%);
  color: #061e14;
  box-shadow: 0 4px 18px rgba(78, 230, 168, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(78, 230, 168, 0.6);
  background: linear-gradient(135deg, #64f3b9 0%, #35e49f 100%);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
}

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

.btn-blue {
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
}

.btn-blue:hover {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  box-shadow: 0 6px 22px rgba(14, 165, 233, 0.55);
  transform: translateY(-2px);
}

/* 导航栏 */
.navbar-wrapper {
  position: sticky;
  top: 16px;
  z-index: 100;
  padding: 0 20px;
  margin-bottom: 30px;
}

.navbar {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: rgba(8, 22, 16, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(82, 222, 169, 0.2);
  border-radius: var(--radius-pill);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
  color: #fff;
}

.brand-logo .logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4ee6a8, #0ea5e9);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(78, 230, 168, 0.6);
}

.brand-logo .logo-icon svg {
  width: 18px;
  height: 18px;
  fill: #06170f;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  color: #cbd5e1;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

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

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

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 4px;
}

/* 首屏 HERO 区域 (复刻图1的高级感) */
.hero-section {
  padding: 40px 0 80px;
  position: relative;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(78, 230, 168, 0.1);
  border: 1px solid rgba(78, 230, 168, 0.3);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 24px;
}

.hero-badge .pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.12;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}

.hero-title .title-serif {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--accent-primary);
  display: block;
}

.hero-desc {
  font-size: 1.12rem;
  color: #94a3b8;
  line-height: 1.7;
  max-width: 540px;
  margin-bottom: 36px;
}

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

.hero-subtags {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.82rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1.2px;
}

.hero-subtags span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-subtags span::before {
  content: "•";
  color: var(--accent-primary);
}

/* 仿图1 玻璃拟态雷达/播放器仪表盘 */
.radar-card {
  position: relative;
  background: rgba(10, 24, 18, 0.7);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border: 1px solid rgba(78, 230, 168, 0.28);
  border-radius: 28px;
  padding: 24px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), inset 0 0 30px rgba(78, 230, 168, 0.05);
  overflow: hidden;
}

.radar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 0.82rem;
  color: #94a3b8;
}

.radar-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-primary);
  font-weight: 600;
}

.signal-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 12px;
}

.signal-bar {
  width: 3px;
  background: var(--accent-primary);
  border-radius: 1px;
}
.signal-bar:nth-child(1) { height: 4px; }
.signal-bar:nth-child(2) { height: 7px; }
.signal-bar:nth-child(3) { height: 10px; }
.signal-bar:nth-child(4) { height: 12px; }

/* 雷达同心圆显示屏 */
.radar-screen {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 0.85;
  margin: 16px 0;
  border-radius: 20px;
  background: radial-gradient(circle at center, #0e2a20 0%, #06140d 75%);
  border: 1px solid rgba(78, 230, 168, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* 同心圆 */
.radar-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed rgba(78, 230, 168, 0.18);
  pointer-events: none;
}
.radar-ring.ring-1 { width: 30%; height: 30%; }
.radar-ring.ring-2 { width: 55%; height: 55%; border-style: solid; border-color: rgba(78, 230, 168, 0.12); }
.radar-ring.ring-3 { width: 80%; height: 80%; }
.radar-ring.ring-4 { width: 96%; height: 96%; border-color: rgba(78, 230, 168, 0.08); }

/* 雷达扫描指针线 */
.radar-sweep {
  position: absolute;
  width: 50%;
  height: 50%;
  top: 0;
  left: 0;
  transform-origin: 100% 100%;
  background: conic-gradient(from 0deg, rgba(78, 230, 168, 0.4) 0deg, transparent 60deg);
  animation: radarSpin 5s linear infinite;
  pointer-events: none;
}

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

/* 节点信号圆点 */
.radar-blip {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 12px #4ee6a8, 0 0 24px #4ee6a8;
  z-index: 2;
}

.radar-blip.hk { top: 38%; left: 62%; animation: blipPulse 2.5s infinite; }
.radar-blip.jp { top: 25%; left: 78%; animation: blipPulse 3s infinite 0.5s; }
.radar-blip.us { top: 68%; left: 30%; animation: blipPulse 2.8s infinite 1s; }
.radar-blip.sg { top: 65%; left: 68%; animation: blipPulse 3.2s infinite 1.5s; }

@keyframes blipPulse {
  0% { transform: scale(0.8); opacity: 0.6; }
  50% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(0.8); opacity: 0.6; }
}

/* 雷达底部信息展示 */
.radar-info-box {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.node-meta h4 {
  font-size: 1.15rem;
  color: #fff;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.node-meta p {
  font-size: 0.8rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ping-tag {
  color: var(--accent-primary);
  background: rgba(78, 230, 168, 0.15);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
}

/* 声波跳动条 */
.wave-bars {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 28px;
  padding: 10px 0;
}

.wave-bar {
  flex: 1;
  background: rgba(78, 230, 168, 0.5);
  border-radius: 2px;
  min-height: 4px;
  animation: waveJump 1.2s ease-in-out infinite alternate;
}

.wave-bar:nth-child(2n) { animation-delay: 0.2s; background: var(--accent-primary); }
.wave-bar:nth-child(3n) { animation-delay: 0.4s; }
.wave-bar:nth-child(4n) { animation-delay: 0.1s; }
.wave-bar:nth-child(5n) { animation-delay: 0.3s; }

@keyframes waveJump {
  0% { height: 4px; }
  50% { height: 26px; }
  100% { height: 8px; }
}

/* 状态控制栏 */
.radar-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.8rem;
  color: #94a3b8;
}

.play-pause-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #06170f;
  transition: transform var(--transition-fast);
}

.play-pause-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 0 15px var(--accent-primary);
}

/* 核心卖点网格区 */
.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(78, 230, 168, 0.1);
  border: 1px solid rgba(78, 230, 168, 0.25);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: var(--accent-primary);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
  color: #fff;
}

.section-subtitle {
  font-size: 1.05rem;
  color: #94a3b8;
  line-height: 1.6;
}

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

.feature-card {
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  background: rgba(12, 28, 21, 0.65);
  border: 1px solid rgba(78, 230, 168, 0.16);
  position: relative;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(78, 230, 168, 0.45);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(78, 230, 168, 0.12);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: rgba(78, 230, 168, 0.12);
  border: 1px solid rgba(78, 230, 168, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  margin-bottom: 22px;
  font-size: 1.5rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.94rem;
  color: #94a3b8;
  line-height: 1.65;
}

/* ===================================================================
   套餐价格区 (精准复刻图2蓝黑色调/高性价比卡片)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: #11282c; /* 参考图2的墨青墨蓝背景 */
  border: 1px solid #1a4249;
  border-radius: 20px;
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.pricing-card.featured {
  border: 1.5px solid #22d3ee;
  box-shadow: 0 15px 40px rgba(14, 165, 233, 0.25), inset 0 0 20px rgba(34, 211, 238, 0.08);
  transform: translateY(-6px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #0284c7, #22d3ee);
  color: #fff;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(34, 211, 238, 0.4);
}

.pricing-plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: #22d3ee; /* 参考图2亮青色标题 */
  text-align: center;
  margin-bottom: 20px;
}

.pricing-price-box {
  text-align: center;
  margin-bottom: 30px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.pricing-currency {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
}

.pricing-amount {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
}

.pricing-cycle {
  font-size: 1.05rem;
  color: #94a3b8;
  font-weight: 500;
}

.pricing-features {
  flex-grow: 1;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: #cbd5e1;
}

.pricing-feature-item .check-icon {
  color: #22d3ee;
  font-size: 1.1rem;
  font-weight: 700;
}

/* 图2底部的登录购买大药丸按钮 */
.pricing-btn {
  width: 100%;
  padding: 14px 20px;
  background: linear-gradient(90deg, #00b4d8 0%, #0077b6 100%);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-pill);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 180, 216, 0.4);
  transition: all var(--transition-fast);
  text-align: center;
  display: block;
}

.pricing-btn:hover {
  background: linear-gradient(90deg, #38bdf8 0%, #0284c7 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(56, 189, 248, 0.6);
}

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

.client-card {
  background: rgba(11, 26, 20, 0.6);
  border: 1px solid rgba(78, 230, 168, 0.16);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-normal);
}

.client-card:hover {
  border-color: rgba(78, 230, 168, 0.45);
  transform: translateY(-4px);
  background: rgba(16, 36, 28, 0.75);
}

.client-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.client-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.client-apps {
  font-size: 0.82rem;
  color: #94a3b8;
  margin-bottom: 16px;
}

.client-link {
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.client-link:hover {
  text-decoration: underline;
}

/* 常见问题排查与知识库 */
.troubleshoot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.troubleshoot-card {
  padding: 28px;
  background: rgba(13, 30, 23, 0.65);
  border: 1px solid rgba(78, 230, 168, 0.18);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.troubleshoot-card:hover {
  border-color: rgba(78, 230, 168, 0.4);
}

.troubleshoot-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.troubleshoot-title .issue-badge {
  background: rgba(239, 68, 68, 0.18);
  color: #f87171;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

.troubleshoot-desc {
  font-size: 0.92rem;
  color: #94a3b8;
  line-height: 1.6;
}

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

.faq-item {
  background: rgba(12, 28, 21, 0.6);
  border: 1px solid rgba(78, 230, 168, 0.15);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active {
  border-color: rgba(78, 230, 168, 0.4);
  background: rgba(15, 36, 27, 0.75);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: transparent;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  color: #f1f5f9;
  text-align: left;
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--accent-primary);
  transition: transform var(--transition-normal);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* 12篇长文索引展示矩阵 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  padding: 26px;
  background: rgba(11, 26, 20, 0.65);
  border: 1px solid rgba(78, 230, 168, 0.16);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: rgba(78, 230, 168, 0.45);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: #64748b;
  margin-bottom: 12px;
}

.article-tag {
  color: var(--accent-primary);
  background: rgba(78, 230, 168, 0.1);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-weight: 600;
}

.article-title {
  font-size: 1.12rem;
  font-weight: 600;
  color: #f8fafc;
  line-height: 1.45;
  margin-bottom: 12px;
}

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

.article-snippet {
  font-size: 0.88rem;
  color: #94a3b8;
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-readmore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-primary);
  font-size: 0.88rem;
  font-weight: 600;
}

.article-readmore:hover {
  text-decoration: underline;
}

/* 页脚 */
.site-footer {
  margin-top: 100px;
  background: #040906;
  border-top: 1px solid rgba(78, 230, 168, 0.15);
  padding: 60px 0 30px;
}

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

.footer-brand p {
  color: #64748b;
  font-size: 0.9rem;
  margin-top: 14px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h5 {
  font-size: 0.95rem;
  color: #fff;
  font-weight: 600;
  margin-bottom: 18px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 0.86rem;
  color: #94a3b8;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: #64748b;
}

/* 独立文章详情页专用样式 */
.article-header {
  padding: 40px 0 30px;
  text-align: center;
}

.article-h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  color: #fff;
}

.article-header-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: #94a3b8;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.article-body-wrapper {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px;
  background: rgba(12, 28, 21, 0.7);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(78, 230, 168, 0.18);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.article-content {
  color: #cbd5e1;
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: #fff;
  margin: 40px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(78, 230, 168, 0.2);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin: 28px 0 14px;
}

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

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
}

.article-content li {
  margin-bottom: 8px;
  list-style-type: disc;
}

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

.article-content blockquote {
  border-left: 4px solid var(--accent-primary);
  background: rgba(78, 230, 168, 0.08);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: #e2e8f0;
}

.article-cta-box {
  margin: 40px 0;
  padding: 28px;
  background: linear-gradient(135deg, rgba(14, 45, 34, 0.8), rgba(8, 24, 18, 0.9));
  border: 1px solid rgba(78, 230, 168, 0.35);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.article-cta-box h3 {
  color: #fff;
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.article-cta-box p {
  color: #94a3b8;
  margin-bottom: 20px;
}

.article-internal-links {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.article-internal-links h4 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 16px;
}

.internal-link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.internal-link-item {
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(78, 230, 168, 0.15);
  border-radius: var(--radius-sm);
  color: #e2e8f0;
  font-size: 0.92rem;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.internal-link-item:hover {
  background: rgba(78, 230, 168, 0.12);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateX(4px);
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid, .pricing-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-secondary {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .features-grid, .pricing-grid, .articles-grid, .troubleshoot-grid, .internal-link-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}