/* ========================================================
   网际快车 (FlashNet) - 琥珀暖金极速落地页样式表 (PRO 增强版)
   纯原生 CSS，无任何外部重型框架，秒开级别加载
   ======================================================== */

:root {
  /* 琥珀暖金色彩系统 */
  --gold-50: #fffbeb;
  --gold-100: #fef3c7;
  --gold-200: #fde68a;
  --gold-300: #fcd34d;
  --gold-400: #fbbf24;
  --gold-500: #f59e0b; /* 主色：琥珀暖金 */
  --gold-600: #d97706; /* 暖金深色 */
  --gold-700: #b45309;
  --gold-800: #92400e;
  --gold-glow: rgba(245, 158, 11, 0.35);
  --gold-gradient: linear-gradient(135deg, #fcd34d 0%, #fbbf24 35%, #f59e0b 70%, #d97706 100%);
  --gold-gradient-hover: linear-gradient(135deg, #fffbeb 0%, #fcd34d 40%, #fbbf24 80%, #f59e0b 100%);
  --gold-border: rgba(245, 158, 11, 0.22);
  --gold-border-highlight: rgba(251, 191, 36, 0.7);

  /* 曜黑夜空奢华底色 */
  --bg-deep: #06080d;
  --bg-main: #0a0e17;
  --bg-surface: #101624;
  --bg-card: rgba(16, 22, 36, 0.75);
  --bg-card-hover: rgba(23, 32, 52, 0.9);
  
  /* 文本颜色 */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-gold: #fbbf24;

  /* 阴影与微动效 */
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 28px rgba(0, 0, 0, 0.6);
  --shadow-gold: 0 12px 36px rgba(245, 158, 11, 0.22);
  --shadow-gold-lg: 0 20px 50px rgba(245, 158, 11, 0.4);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color-scheme: dark;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-deep);
  background-image: 
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(245, 158, 11, 0.18), transparent 70%),
    radial-gradient(circle at 10% 45%, rgba(217, 119, 6, 0.08), transparent 45%),
    radial-gradient(circle at 90% 70%, rgba(245, 158, 11, 0.08), transparent 50%);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 版心容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 链接基础 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 14px 34px;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gold-gradient);
  color: #0b0f17;
  box-shadow: var(--shadow-gold);
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-25deg);
  transition: 0.75s ease;
}

.btn-primary:hover::after {
  left: 180%;
}

.btn-primary:hover {
  background: var(--gold-gradient-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold-lg);
  color: #000;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  background: rgba(245, 158, 11, 0.08);
  color: var(--gold-300);
  border: 1px solid var(--gold-border);
}

.btn-outline:hover {
  background: rgba(245, 158, 11, 0.18);
  border-color: var(--gold-400);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.15);
}

/* 徽章 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(245, 158, 11, 0.12);
  color: var(--gold-300);
  border: 1px solid rgba(245, 158, 11, 0.32);
  letter-spacing: 0.5px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--gold-400);
  box-shadow: 0 0 10px var(--gold-400);
  animation: pulseAnimation 2s infinite;
}

@keyframes pulseAnimation {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.35); opacity: 1; box-shadow: 0 0 14px var(--gold-300); }
  100% { transform: scale(0.95); opacity: 0.7; }
}

/* 章节通用 */
.section {
  padding: 95px 0;
  position: relative;
}

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

.section-title {
  font-size: 2.45rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-top: 14px;
  margin-bottom: 16px;
  background: linear-gradient(180deg, #ffffff 45%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title .gold-text {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* ================= 顶栏导航 (增加导航目录) ================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 76px;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(245, 158, 11, 0.16);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 20px;
}

/* 左上角品牌互动 Logo (点击平滑回顶) */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  background: transparent;
  border: none;
  outline: none;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  flex-shrink: 0;
}

.brand-logo:hover {
  background: rgba(245, 158, 11, 0.08);
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.4);
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.4s;
  color: #0b0f17;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.logo-title {
  font-size: 1.28rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.5px;
  line-height: 1.2;
}

.logo-sub {
  font-size: 0.68rem;
  color: var(--gold-400);
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* 中间导航目录 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: #cbd5e1;
  position: relative;
  padding: 6px 0;
  transition: color 0.25s ease;
}

.nav-link:hover {
  color: var(--gold-300);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gold-gradient);
  transition: width 0.3s ease, left 0.3s ease;
  border-radius: 2px;
}

.nav-link:hover::after {
  width: 100%;
  left: 0;
}

.nav-right-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.nav-btn {
  padding: 10px 24px;
  font-size: 0.92rem;
}

/* ================= 1. 主视觉区 (左右分布增强版) ================= */
.hero-section {
  padding-top: 145px;
  padding-bottom: 90px;
  position: relative;
  overflow: hidden;
}

.hero-glow-sphere {
  position: absolute;
  top: 15%;
  left: 55%;
  transform: translate(-50%, -20%);
  width: 720px;
  height: 480px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.22) 0%, rgba(217, 119, 6, 0.05) 60%, transparent 80%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

/* 左右两栏布局容器 */
.hero-split-layout {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 50px;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* 左侧标题与简介内容 */
.hero-left-content {
  text-align: left;
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  margin: 20px 0;
}

.hero-title .brand-highlight {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-title .highlight {
  color: #ffffff;
  position: relative;
}

.hero-title .highlight::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 8px;
  background: rgba(245, 158, 11, 0.25);
  z-index: -1;
  border-radius: 4px;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-muted);
  margin-bottom: 34px;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--gold-200);
}

/* 右侧动态监控仪表图卡 (Dynamic Card) */
.hero-dynamic-card {
  background: linear-gradient(145deg, rgba(19, 27, 43, 0.88) 0%, rgba(13, 19, 31, 0.95) 100%);
  border: 1px solid var(--gold-border-highlight);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(245, 158, 11, 0.18);
  position: relative;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.hero-dynamic-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(245, 158, 11, 0.28);
}

/* 顶部状态栏 */
.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 22px;
}

.card-title-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
}

.status-online {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #10b981;
  background: rgba(16, 185, 129, 0.12);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-online-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulseAnimation 1.5s infinite;
}

/* 动态测速仪表盘核心区 */
.speed-meter-wrap {
  text-align: center;
  padding: 10px 0 20px;
  position: relative;
}

.speed-meter-val {
  font-size: 3.8rem;
  font-weight: 900;
  line-height: 1;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-variant-numeric: tabular-nums;
  letter-spacing: -1px;
}

.speed-meter-unit {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gold-300);
  margin-left: 6px;
}

.speed-meter-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* 动态波形脉冲条 */
.wave-canvas-wrap {
  width: 100%;
  height: 48px;
  margin: 16px 0;
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
}

.wave-svg {
  width: 100%;
  height: 100%;
}

.wave-path {
  fill: none;
  stroke: url(#goldWaveGrad);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: drawWave 3.5s linear infinite;
}

@keyframes drawWave {
  0% { stroke-dashoffset: 600; }
  50% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -600; }
}

/* 遥测参数网格 */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.telemetry-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: var(--radius-sm);
  padding: 12px 10px;
  text-align: center;
}

.telemetry-num {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
}

.telemetry-lbl {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* 链路流转线路卡 */
.route-flow-box {
  background: rgba(245, 158, 11, 0.06);
  border: 1px dashed rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}

.route-step {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #e2e8f0;
  font-weight: 600;
}

.route-arrow {
  color: var(--gold-400);
  font-weight: bold;
}

/* ================= 2. 核心优势卡片 (细节增强版) ================= */
.core-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  position: relative;
  transition: var(--transition);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gold-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  border-color: var(--gold-border-highlight);
  box-shadow: var(--shadow-gold);
}

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

.feature-icon-wrapper {
  width: 66px;
  height: 66px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.16) 0%, rgba(217, 119, 6, 0.08) 100%);
  border: 1px solid rgba(245, 158, 11, 0.32);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--gold-400);
  transition: var(--transition);
}

.feature-card:hover .feature-icon-wrapper {
  background: var(--gold-gradient);
  color: #0b0f17;
  transform: scale(1.08) rotate(3deg);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
}

.feature-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag-chip {
  font-size: 0.78rem;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--gold-200);
  padding: 5px 12px;
  border-radius: 6px;
  font-weight: 500;
}

/* ================= 3. 流媒体与 AI 支持图卡 (品牌真实高保真 SVG 细节) ================= */
.unlock-wrapper {
  background: linear-gradient(180deg, rgba(19, 27, 43, 0.7) 0%, rgba(13, 19, 31, 0.95) 100%);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-md);
}

.unlock-category {
  margin-bottom: 38px;
}

.unlock-category:last-child {
  margin-bottom: 0;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.category-header h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #ffffff;
}

.category-header .cat-icon {
  color: var(--gold-400);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.service-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(245, 158, 11, 0.16);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card:hover {
  background: rgba(245, 158, 11, 0.09);
  border-color: var(--gold-400);
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.5), 0 0 15px rgba(245, 158, 11, 0.15);
}

/* 品牌官方高质感图卡图标 */
.service-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.service-card:hover .service-icon-box {
  transform: scale(1.12);
}

.service-info {
  display: flex;
  flex-direction: column;
}

.service-name {
  font-size: 1.02rem;
  font-weight: 700;
  color: #fff;
}

.service-spec {
  font-size: 0.78rem;
  color: var(--gold-300);
  margin-top: 3px;
}

/* ================= 4. 套餐价格对比表 (参考真实专线套餐价格) ================= */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  border-color: var(--gold-border-highlight);
  transform: translateY(-8px);
  box-shadow: var(--shadow-gold);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 42, 68, 0.88) 0%, rgba(19, 27, 43, 0.98) 100%);
  border: 2px solid var(--gold-400);
  box-shadow: var(--shadow-gold);
  transform: scale(1.03);
}

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

.featured-ribbon {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-gradient);
  color: #0b0f17;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 5px 20px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.45);
}

.plan-badge-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gold-300);
  background: rgba(245, 158, 11, 0.12);
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
  width: fit-content;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
}

.plan-price-wrap {
  margin: 24px 0;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.plan-currency {
  font-size: 1.35rem;
  color: var(--gold-400);
  font-weight: 700;
}

.plan-amount {
  font-size: 3.2rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.plan-cycle {
  font-size: 0.92rem;
  color: var(--text-dim);
  margin-left: 6px;
}

.plan-discount-sub {
  font-size: 0.8rem;
  color: var(--gold-300);
  margin-top: 6px;
}

.plan-features {
  list-style: none;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-main);
  margin-bottom: 15px;
}

.plan-features li svg {
  color: var(--gold-400);
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
}

/* ================= 5. 用户评价 ================= */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.testi-card {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}

.testi-card:hover {
  transform: translateY(-6px);
  border-color: var(--gold-border-highlight);
  box-shadow: var(--shadow-gold);
}

.testi-stars {
  color: var(--gold-400);
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.testi-comment {
  font-size: 0.96rem;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.testi-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar-circle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gold-gradient);
  color: #0b0f17;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.05rem;
}

.author-meta h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
}

.author-meta p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ================= 6. 常见问题解答 (FAQ) ================= */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(245, 158, 11, 0.45);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 1.08rem;
  font-weight: 700;
  cursor: pointer;
}

.faq-toggle-icon {
  width: 22px;
  height: 22px;
  color: var(--gold-400);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 260px;
  padding-bottom: 24px;
}

/* 底部 CTA 条 */
.bottom-cta-banner {
  background: radial-gradient(circle at 50% 50%, rgba(245, 158, 11, 0.18) 0%, rgba(16, 22, 36, 0.96) 80%);
  border: 1px solid var(--gold-border-highlight);
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  text-align: center;
  margin-top: 50px;
  box-shadow: var(--shadow-gold-lg);
}

.bottom-cta-banner h2 {
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 14px;
  color: #fff;
}

.bottom-cta-banner p {
  color: var(--text-muted);
  font-size: 1.08rem;
  margin-bottom: 30px;
}

/* ================= 页脚 (严格仅保留4个标题，新页面打开) ================= */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(245, 158, 11, 0.16);
  padding: 52px 0 42px;
  position: relative;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
}

.footer-links-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 38px;
  flex-wrap: wrap;
}

.footer-link-item {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 6px 4px;
}

.footer-link-item:hover {
  color: var(--gold-300);
}

.footer-link-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gold-gradient);
  transition: width 0.3s ease, left 0.3s ease;
}

.footer-link-item:hover::after {
  width: 100%;
  left: 0;
}

.footer-divider-dot {
  color: var(--gold-700);
  font-size: 0.9rem;
  user-select: none;
}

.footer-copy {
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}

/* SEO 信任与安全背书徽章条 */
.footer-trust-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 16px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  width: 100%;
}

.footer-trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--gold-200);
  background: rgba(245, 158, 11, 0.06);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(245, 158, 11, 0.18);
}

.footer-trust-badge svg {
  color: var(--gold-400);
  flex-shrink: 0;
}

/* 官方权威通道与 PBN 权重传递锚文本条 */
.footer-pbn-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
}

.footer-pbn-label {
  color: var(--text-dim);
  font-weight: 600;
}

.footer-pbn-link {
  color: var(--gold-300);
  font-weight: 600;
  text-decoration: none;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(245, 158, 11, 0.15);
  transition: var(--transition);
}

.footer-pbn-link:hover {
  background: var(--gold-gradient);
  color: #0b0f17;
  border-color: var(--gold-400);
  box-shadow: 0 2px 10px rgba(245, 158, 11, 0.3);
}

/* 节点服务器运行状态指示 */
.footer-system-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: #10b981;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 4px 14px;
  border-radius: var(--radius-full);
}

.status-dot-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulseAnimation 2s infinite;
}

/* 博客矩阵与友情链接行 (居中美观) */
.footer-friend-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: var(--radius-full);
}

.friend-links-label {
  color: var(--gold-400);
  font-weight: 700;
}

.footer-blog-link {
  color: #e2e8f0;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
}

.footer-blog-link:hover {
  color: var(--gold-300);
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

.footer-link-separator {
  color: var(--text-dim);
  user-select: none;
}

/* ================= 右侧悬浮上下翻页箭头控件 ================= */
.floating-stepper {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: rgba(13, 18, 30, 0.8);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 10px 8px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(245, 158, 11, 0.3);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.7);
  user-select: none;
}

.stepper-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  color: var(--gold-300);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.stepper-btn:hover {
  background: var(--gold-gradient);
  color: #0b0f17;
  transform: scale(1.15);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.55);
  border-color: var(--gold-400);
}

.stepper-btn:active {
  transform: scale(0.92);
}

.stepper-btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
  border-color: rgba(255, 255, 255, 0.08);
}

.stepper-indicator {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--gold-400);
  padding: 4px 0;
  letter-spacing: 1px;
}

/* ================= 4.5. SEO 深度评测与技术专栏文章图卡 (位于价格表下方) ================= */
.articles-section {
  position: relative;
  background: radial-gradient(circle at 50% 30%, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
}

.articles-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
  background: var(--gold-gradient);
  color: #0b0f17;
  border-color: var(--gold-400);
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card-item {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-md);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  text-decoration: none;
  overflow: hidden;
}

.article-card-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.article-card-item:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: var(--gold-border-highlight);
  box-shadow: var(--shadow-gold);
}

.article-card-item:hover::before {
  opacity: 1;
}

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

.article-tag-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gold-300);
  background: rgba(245, 158, 11, 0.12);
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.article-date-text {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.article-card-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color 0.25s ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-item:hover .article-card-title {
  color: var(--gold-300);
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.82rem;
}

.article-read-more {
  color: var(--gold-400);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-more svg {
  transition: transform 0.25s ease;
}

.article-card-item:hover .article-read-more svg {
  transform: translateX(4px);
}

.articles-load-more-wrap {
  text-align: center;
  margin-top: 40px;
}

/* ================= 辅助/子页面专用样式 ================= */
.subpage-hero {
  padding-top: 140px;
  padding-bottom: 50px;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(245, 158, 11, 0.16) 0%, transparent 60%);
  border-bottom: 1px solid rgba(245, 158, 11, 0.14);
}

.subpage-body {
  padding: 60px 0 100px;
}

.subpage-card {
  background: var(--bg-card);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 30px;
}

.subpage-card h2 {
  color: var(--gold-300);
  font-size: 1.5rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-card p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-card ul {
  padding-left: 20px;
  color: #cbd5e1;
  line-height: 1.8;
}

.subpage-card li {
  margin-bottom: 8px;
}

.back-home-bar {
  margin-top: 40px;
  text-align: center;
}

/* ================= 响应式媒体查询 (移动端优先/单栏适配) ================= */
@media (max-width: 1100px) {
  .hero-split-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-left-content {
    text-align: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-trust-bar {
    justify-content: center;
  }
  .hero-dynamic-card {
    max-width: 540px;
    margin: 0 auto;
  }
  .nav-menu {
    gap: 18px;
  }
}

@media (max-width: 880px) {
  .nav-menu {
    display: none; /* 移动端收起中间导航，突出主CTA */
  }
}

@media (max-width: 768px) {
  .header {
    height: 68px;
  }
  
  .hero-section {
    padding-top: 100px;
    padding-bottom: 60px;
  }
  
  .hero-title {
    font-size: 2.2rem;
    line-height: 1.25;
  }

  .hero-subtitle {
    font-size: 1.02rem;
  }

  .hero-dynamic-card {
    padding: 22px 18px;
  }

  .speed-meter-val {
    font-size: 3rem;
  }

  .core-features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .unlock-wrapper {
    padding: 24px 18px;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .articles-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .floating-stepper {
    right: 12px;
    padding: 6px 4px;
    gap: 6px;
  }

  .stepper-btn {
    width: 38px;
    height: 38px;
  }

  .footer-links-row {
    gap: 16px;
  }

  .footer-divider-dot {
    display: none;
  }

  .footer-link-item {
    font-size: 0.95rem;
    background: rgba(255, 255, 255, 0.04);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(245, 158, 11, 0.15);
  }

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

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .nav-btn {
    display: none;
  }
}