/* ==========================================================================
   慈善机场 (Charity Airport) 核心样式表
   视觉风格：暗黑航空科技感 (Deep Navy #050b1a + Cyan #00e5ff + 玻璃拟态)
   纯 CSS，无任何外部重型框架，秒开极简
   ========================================================================== */

:root {
  --bg-dark: #050b1a;
  --bg-card: rgba(11, 21, 45, 0.7);
  --bg-card-hover: rgba(15, 29, 62, 0.85);
  --bg-panel: rgba(9, 17, 36, 0.85);
  --cyan: #00e5ff;
  --cyan-dim: rgba(0, 229, 255, 0.15);
  --cyan-glow: rgba(0, 229, 255, 0.35);
  --blue-primary: #0077ff;
  --text-main: #f0f4fc;
  --text-muted: #8fa0c2;
  --text-dim: #5c6f93;
  --border-card: rgba(0, 229, 255, 0.18);
  --border-light: rgba(255, 255, 255, 0.08);
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, "Courier New", monospace;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

body {
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 229, 255, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 100% 50%, rgba(0, 119, 255, 0.05) 0%, transparent 50%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  background-position: 0 0, 0 0, -1px -1px, -1px -1px;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

/* 容器与布局 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

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

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--cyan-dim);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--cyan);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 16px;
}

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

/* 导航栏 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(5, 11, 26, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.nav-logo-badge {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(0, 119, 255, 0.2));
  border: 1px solid var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 0 15px var(--cyan-glow);
}

.nav-brand-text span {
  color: var(--cyan);
}

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

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width 0.25s ease;
}

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

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

/* 按钮通用组件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  border: none;
  white-space: nowrap;
}

.btn-cyan {
  background: var(--cyan);
  color: #050b1a;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.35);
}

.btn-cyan:hover {
  background: #33ebff;
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.6);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(0, 229, 255, 0.06);
  border: 1px solid rgba(0, 229, 255, 0.35);
  color: var(--cyan);
}

.btn-outline:hover {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  color: var(--text-main);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: 10px;
}

/* 手机菜单按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.6rem;
  cursor: pointer;
}

/* Hero 主视觉区 (双列分栏) */
.hero-section {
  padding: 60px 0 80px 0;
  position: relative;
  overflow: hidden;
}

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

.hero-headline {
  font-family: var(--font-heading);
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}

.text-gradient {
  background: linear-gradient(135deg, #00e5ff 0%, #38bdf8 50%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

/* 实时专线状态走字条 (Ticker Strip) */
.live-ticker-strip {
  display: flex;
  align-items: center;
  background: rgba(11, 21, 45, 0.8);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 8px;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-main);
  overflow: hidden;
  box-shadow: inset 0 0 15px rgba(0, 229, 255, 0.05);
}

.live-ticker-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--cyan);
  font-weight: 700;
  margin-right: 14px;
  white-space: nowrap;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 8px rgba(0, 229, 255, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 229, 255, 0); }
}

.ticker-content {
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ticker-content span {
  color: var(--cyan);
}

/* Hero 右列：SVG 航空专线大圆弧与航行交互 */
.flight-canvas-card {
  position: relative;
  background: radial-gradient(circle at center, rgba(16, 32, 68, 0.8) 0%, rgba(5, 11, 26, 0.95) 100%);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), inset 0 0 30px rgba(0, 229, 255, 0.05);
  backdrop-filter: blur(12px);
}

.flight-canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.flight-canvas-header .status-tag {
  color: var(--cyan);
  display: flex;
  align-items: center;
  gap: 6px;
}

.flight-svg-wrap {
  width: 100%;
  aspect-ratio: 4 / 3;
  position: relative;
}

.flight-svg-wrap svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.map-grid-line {
  stroke: rgba(255, 255, 255, 0.05);
  stroke-width: 1;
}

.flight-path-bg {
  stroke: rgba(0, 229, 255, 0.15);
  stroke-width: 2.5;
  stroke-linecap: round;
  fill: none;
}

.flight-path-dash {
  stroke: var(--cyan);
  stroke-width: 2.5;
  stroke-dasharray: 6 6;
  stroke-linecap: round;
  fill: none;
}

.waypoint-node {
  fill: var(--bg-dark);
  stroke: var(--cyan);
  stroke-width: 2;
  transition: var(--transition);
}

.waypoint-node.active-arrival {
  fill: var(--cyan);
  filter: drop-shadow(0 0 10px #00e5ff);
}

.waypoint-label {
  fill: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.plane-marker {
  fill: var(--cyan);
  filter: drop-shadow(0 0 8px #00e5ff);
}

.flight-canvas-footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-align: center;
}

.flight-stat-label {
  color: var(--text-dim);
  margin-bottom: 2px;
}

.flight-stat-val {
  color: var(--cyan);
  font-weight: 700;
}

/* 实时数据面板 (Live Impact Dashboard) */
.impact-dashboard {
  background: linear-gradient(180deg, rgba(11, 21, 45, 0.3) 0%, rgba(5, 11, 26, 0.7) 100%);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

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

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 14px;
  padding: 24px 20px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 0 12px 30px rgba(0, 229, 255, 0.2);
}

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

.stat-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.stat-card-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-delta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(0, 229, 255, 0.12);
  color: var(--cyan);
  border: 1px solid rgba(0, 229, 255, 0.25);
}

.stat-card-number {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.1;
  margin-bottom: 14px;
}

.sparkline-wrap {
  width: 100%;
  height: 38px;
  margin-top: auto;
}

.sparkline-wrap svg {
  width: 100%;
  height: 100%;
}

.sparkline-path {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sparkline-fill {
  fill: url(#cyan-spark-gradient);
}

/* 产品核心优势介绍 (Active Missions 3列卡片) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.mission-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.mission-card:hover {
  transform: translateY(-8px);
  border-color: var(--cyan);
  box-shadow: 0 16px 36px rgba(0, 229, 255, 0.22), inset 0 0 15px rgba(0, 229, 255, 0.08);
}

.mission-svg-cover {
  width: 100%;
  height: 130px;
  background: rgba(5, 11, 26, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  margin-bottom: 20px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mission-tag-chip {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: rgba(0, 229, 255, 0.12);
  color: var(--cyan);
  border: 1px solid rgba(0, 229, 255, 0.25);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.mission-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.mission-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.mission-progress-meta {
  margin-top: auto;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.progress-track {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #0077ff, var(--cyan));
  border-radius: 3px;
}

/* 流媒体与 AI 支持图卡 */
.features-split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 32px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.media-ai-card:hover {
  transform: translateY(-6px);
  border-color: var(--cyan);
  box-shadow: 0 14px 32px rgba(0, 229, 255, 0.2);
}

.card-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 4px 12px;
  border-radius: 6px;
  margin-bottom: 16px;
}

.card-heading {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: #ffffff;
  margin-bottom: 12px;
}

.card-summary {
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.support-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.support-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--text-main);
  transition: var(--transition);
}

.support-pill:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--cyan);
  color: #ffffff;
}

/* 3步极速使用指南 (How It Works) */
.how-it-works-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  backdrop-filter: blur(12px);
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

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

.step-col:not(:last-child) {
  border-right: 1px solid var(--border-card);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(0, 229, 255, 0.2);
  margin-bottom: 16px;
  transition: var(--transition);
}

.step-col:hover .step-number {
  color: var(--cyan);
  transform: translateX(4px);
}

.step-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: #ffffff;
  margin-bottom: 12px;
}

.step-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* 套餐价格对比表 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 18px;
  padding: 36px 28px;
  backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--cyan);
  box-shadow: 0 16px 40px rgba(0, 229, 255, 0.22);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(16, 32, 68, 0.9) 0%, rgba(11, 21, 45, 0.85) 100%);
  border-color: var(--cyan);
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.2);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 0 16px 48px rgba(0, 229, 255, 0.35);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #0077ff, var(--cyan));
  color: #050b1a;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 999px;
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.5);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.pricing-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 24px;
  margin-bottom: 24px;
  text-align: center;
}

.pricing-tier-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: #ffffff;
  margin-bottom: 10px;
}

.pricing-amount {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 8px;
}

.pricing-currency {
  font-size: 1.3rem;
  color: var(--cyan);
  font-family: var(--font-mono);
}

.pricing-value {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  color: #ffffff;
}

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

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

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

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.93rem;
  color: var(--text-main);
  padding: 10px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}

.feature-check-icon {
  color: var(--cyan);
  font-size: 1rem;
  flex-shrink: 0;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 14px;
  padding: 26px;
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--cyan);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.05rem;
  margin-bottom: 14px;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.reviewer-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.25), rgba(0, 119, 255, 0.25));
  border: 1px solid var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--cyan);
  font-size: 0.9rem;
}

.reviewer-name {
  font-weight: 600;
  font-size: 0.92rem;
  color: #ffffff;
}

.reviewer-role {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* 常见问题解答 (FAQ) */
.faq-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-card);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-q-title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 600;
  color: #ffffff;
}

.faq-toggle-icon {
  color: var(--cyan);
  font-size: 1.2rem;
  transition: transform 0.25s ease;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 20px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  display: none;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 底部行动召唤区 (Centered CTA with Radial Glow) */
.bottom-cta-section {
  text-align: center;
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.bottom-cta-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 350px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.15) 0%, rgba(0, 119, 255, 0.05) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.cta-box {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.cta-headline {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 20px;
  line-height: 1.25;
}

.cta-subtext {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 36px;
}

.cta-btns {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* 页脚 (只保留4个标题，内容新开页面展示 + 单发丝线分割) */
.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: #030712;
  padding: 40px 0 36px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

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

.footer-nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

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

.footer-hairline-row {
  width: 100%;
  max-width: 800px;
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
}

.footer-copyright {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
}

/* 文章页及子页面通用样式 */
.subpage-hero {
  padding: 60px 0 40px 0;
  border-bottom: 1px solid var(--border-light);
  background: rgba(11, 21, 45, 0.4);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--cyan);
}

.article-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 48px;
  margin: 48px 0;
  backdrop-filter: blur(12px);
  line-height: 1.85;
}

.article-content-box h1 {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  margin-bottom: 16px;
  color: #ffffff;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 20px;
  margin-bottom: 32px;
}

.article-content-box h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  color: var(--cyan);
  margin: 36px 0 16px 0;
}

.article-content-box h3 {
  font-size: 1.25rem;
  color: #ffffff;
  margin: 24px 0 12px 0;
}

.article-content-box p {
  color: #d1d9ec;
  margin-bottom: 20px;
}

.article-content-box ul, .article-content-box ol {
  margin: 0 0 24px 24px;
  color: #d1d9ec;
}

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

.article-highlight-box {
  background: rgba(0, 229, 255, 0.05);
  border-left: 4px solid var(--cyan);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 28px 0;
  color: #e2e8f0;
}

.article-author-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 20px;
  margin-top: 48px;
}

/* 资讯列表卡片 */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 40px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 30px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.news-card:hover {
  transform: translateY(-6px);
  border-color: var(--cyan);
  box-shadow: 0 14px 32px rgba(0, 229, 255, 0.2);
}

.news-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cyan);
  background: var(--cyan-dim);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 14px;
}

.news-card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-card-title a:hover {
  color: var(--cyan);
}

.news-card-desc {
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.news-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

/* 响应式媒体查询 (完美单栏显示与移动端优化) */
@media (max-width: 920px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-headline {
    font-size: 2.4rem;
  }

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

  .advantages-grid,
  .features-split-grid,
  .pricing-grid,
  .reviews-grid,
  .news-grid {
    grid-template-columns: 1fr;
  }

  .how-it-works-panel {
    grid-template-columns: 1fr;
  }

  .step-col:not(:last-child) {
    border-right: none;
    border-bottom: 1px solid var(--border-card);
  }

  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(5, 11, 26, 0.98);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-card);
    gap: 18px;
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }
}

@media (max-width: 600px) {
  .section {
    padding: 64px 0;
  }

  .hero-headline {
    font-size: 2rem;
  }

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

  .hero-ctas, .cta-btns {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    min-height: 48px;
  }

  .footer-nav-four {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .article-content-box {
    padding: 24px 18px;
  }
}