/* ==========================================================================
   TNT云 (tntcloud) - 纯原生电磁科技风格样式表
   电磁炮 · 轨道加速 · 电磁科技
   主背景：#020617 深空黑 | 主色：#00F5FF 电磁青 | 次色：#FCD34D 弹道金
   ========================================================================== */

:root {
  --bg-primary: #020617;
  --bg-secondary: #060e24;
  --bg-card: rgba(6, 15, 38, 0.82);
  --bg-card-hover: rgba(10, 24, 58, 0.92);
  --border-color: rgba(0, 245, 255, 0.16);
  --border-hover: rgba(0, 245, 255, 0.55);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #8494ad;
  
  --accent-cyan: #00F5FF;   /* 电磁青 */
  --accent-gold: #FCD34D;   /* 弹道金 */
  --accent-gradient: linear-gradient(135deg, #00F5FF 0%, #FCD34D 100%);
  --accent-gradient-hover: linear-gradient(135deg, #38bdf8 0%, #fbbf24 100%);
  --card-gradient: linear-gradient(180deg, rgba(0, 245, 255, 0.05) 0%, rgba(252, 211, 77, 0.01) 100%);
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-glow-cyan: 0 0 30px rgba(0, 245, 255, 0.55);
  --shadow-glow-gold: 0 0 30px rgba(252, 211, 77, 0.45);
  --shadow-card: 0 12px 36px -5px rgba(0, 0, 0, 0.75);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-btn: 12px;      /* 指定 12px 圆角 */
  --radius-full: 9999px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s 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;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  background-image: 
    radial-gradient(circle at 10% 15%, rgba(0, 245, 255, 0.09) 0%, transparent 45%),
    radial-gradient(circle at 90% 45%, rgba(252, 211, 77, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, rgba(0, 245, 255, 0.05) 0%, transparent 50%),
    linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ==========================================================================
   【背景动效】：青/金粒子从左到右横向飞过（4 秒一周期，模拟电磁炮弹道）
   ========================================================================== */
.particles-track-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.particle-streak {
  position: absolute;
  height: 2px;
  border-radius: 999px;
  opacity: 0;
  animation: streakAcross 4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.particle-streak.streak-1 {
  top: 14%;
  width: 90px;
  background: linear-gradient(90deg, transparent, #00F5FF 70%, #ffffff);
  box-shadow: 0 0 14px #00F5FF, -20px 0 25px rgba(0, 245, 255, 0.6);
  animation-delay: 0s;
}

.particle-streak.streak-2 {
  top: 32%;
  width: 120px;
  background: linear-gradient(90deg, transparent, #FCD34D 70%, #ffffff);
  box-shadow: 0 0 14px #FCD34D, -25px 0 30px rgba(252, 211, 77, 0.6);
  animation-delay: 1.1s;
}

.particle-streak.streak-3 {
  top: 56%;
  width: 80px;
  background: linear-gradient(90deg, transparent, #00F5FF 70%, #ffffff);
  box-shadow: 0 0 14px #00F5FF, -20px 0 25px rgba(0, 245, 255, 0.6);
  animation-delay: 2.3s;
}

.particle-streak.streak-4 {
  top: 76%;
  width: 130px;
  background: linear-gradient(90deg, transparent, #FCD34D 70%, #ffffff);
  box-shadow: 0 0 14px #FCD34D, -30px 0 35px rgba(252, 211, 77, 0.6);
  animation-delay: 3.1s;
}

.particle-streak.streak-5 {
  top: 90%;
  width: 100px;
  background: linear-gradient(90deg, transparent, #00F5FF 60%, #FCD34D 90%, #ffffff);
  box-shadow: 0 0 14px #00F5FF, -20px 0 25px rgba(252, 211, 77, 0.5);
  animation-delay: 0.6s;
}

@keyframes streakAcross {
  0% {
    left: -160px;
    opacity: 0;
    transform: scaleX(0.4);
  }
  15% {
    opacity: 0.95;
    transform: scaleX(1.3);
  }
  85% {
    opacity: 0.95;
    transform: scaleX(1.8);
  }
  100% {
    left: 105vw;
    opacity: 0;
    transform: scaleX(0.4);
  }
}

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

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

ul {
  list-style: none;
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* 导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #020617;
  font-weight: 900;
  font-size: 1.15rem;
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.6);
}

.logo-text {
  background: linear-gradient(135deg, #00F5FF 0%, #ffffff 40%, #FCD34D 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.6);
}

.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent-cyan);
  font-weight: 600;
  position: relative;
}

.nav-link-badge::after {
  content: "NEW";
  font-size: 0.65rem;
  padding: 1px 6px;
  background: var(--accent-gradient);
  color: #020617;
  font-weight: 800;
  border-radius: var(--radius-full);
  line-height: 1.2;
}

/* ==========================================================================
   【CTA 按钮规范】：青到金的渐变按钮，圆角 12px，带 30px 青色辉光
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-btn); /* 严格 12px 圆角 */
  font-size: 1.05rem;
  font-weight: 800;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  min-height: 48px;
  position: relative;
}

.btn-primary, .nav-cta-btn {
  background: var(--accent-gradient);
  color: #020617; /* 高对比暗黑字 */
  border-radius: var(--radius-btn); /* 严格 12px 圆角 */
  box-shadow: var(--shadow-glow-cyan); /* 30px 青色辉光 */
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 800;
}

.btn-primary:hover, .nav-cta-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 45px rgba(0, 245, 255, 0.8), 0 0 25px rgba(252, 211, 77, 0.5);
  background: var(--accent-gradient-hover);
}

.btn-secondary {
  background: rgba(2, 6, 23, 0.75);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 245, 255, 0.4);
  border-radius: var(--radius-btn);
  backdrop-filter: blur(8px);
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.15);
}

.btn-secondary:hover {
  background: rgba(0, 245, 255, 0.08);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  box-shadow: 0 0 25px rgba(252, 211, 77, 0.35);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

/* 区域公共样式 */
.section {
  padding: 85px 0;
  position: relative;
  z-index: 2;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
  background: rgba(0, 245, 255, 0.1);
  border: 1px solid rgba(0, 245, 255, 0.3);
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
}

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

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--text-main);
}

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

/* 主视觉 Hero 区域 (标题与动画居左排版) */
.hero {
  padding: 90px 0 70px 0;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0, 245, 255, 0.08);
  border: 1px solid rgba(0, 245, 255, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  margin-left: 0;
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.25);
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  display: inline-block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 24px;
  text-align: left;
  max-width: 820px;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 40px rgba(0, 245, 255, 0.35);
}

/* 平台简介面板 (靠左对齐) */
.hero-intro {
  max-width: 820px;
  margin: 0 0 36px 0;
  background: rgba(6, 15, 38, 0.78);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  text-align: left;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6), inset 0 0 15px rgba(0, 245, 255, 0.05);
}

.hero-intro-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.hero-intro-text {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin: 0;
}

.hero-intro-text strong {
  color: var(--accent-cyan);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 20px;
  margin-bottom: 48px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

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

.metric-value {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.1;
  margin-bottom: 6px;
  text-shadow: 0 0 15px rgba(0, 245, 255, 0.4);
}

.metric-label {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* ==========================================================================
   【右侧动画】：
   3 条水平电磁轨道（青/金渐变发光线，宽度脉冲变化 2 秒一周期）。
   一个 20px 白→金→青径向渐变弹丸从左到右沿轨道加速飞行（2 秒一周期+双层辉光拖尾）。
   2 层虚线圆轨道反向旋转。
   ========================================================================== */
.hero-railgun-visual {
  position: absolute;
  right: max(10px, calc(50% - 600px + 10px));
  left: auto;
  top: 15%;
  width: 340px;
  height: 340px;
  pointer-events: none;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.95;
}

/* 2 层虚线圆轨道反向旋转 */
.dashed-orbit-outer {
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  border: 2px dashed rgba(0, 245, 255, 0.42);
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.15), inset 0 0 25px rgba(0, 245, 255, 0.1);
  animation: orbitRotateCW 12s linear infinite;
}

.dashed-orbit-inner {
  position: absolute;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  border: 2px dashed rgba(252, 211, 77, 0.48);
  box-shadow: 0 0 20px rgba(252, 211, 77, 0.15);
  animation: orbitRotateCCW 8s linear infinite;
}

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

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

/* 3 条水平电磁轨道（青/金渐变发光线，宽度脉冲变化 2 秒一周期） */
.railgun-tracks {
  position: absolute;
  width: 360px;
  height: 90px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  overflow: visible;
}

.rail-line {
  width: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(0, 245, 255, 0.15) 0%, #00F5FF 45%, #FCD34D 85%, rgba(252, 211, 77, 0.15) 100%);
  animation: railPulse 2s ease-in-out infinite;
}

.rail-top {
  height: 2px;
  animation-delay: 0s;
}

.rail-mid {
  height: 3px;
  animation-delay: 0.2s;
  box-shadow: 0 0 16px rgba(0, 245, 255, 0.8);
}

.rail-bottom {
  height: 2px;
  animation-delay: 0.4s;
}

@keyframes railPulse {
  0%, 100% {
    transform: scaleX(0.85);
    opacity: 0.6;
    box-shadow: 0 0 8px rgba(0, 245, 255, 0.4);
  }
  50% {
    transform: scaleX(1.06);
    opacity: 1;
    box-shadow: 0 0 22px rgba(0, 245, 255, 0.9), 0 0 35px rgba(252, 211, 77, 0.55);
  }
}

/* 20px 白→金→青径向渐变弹丸从左到右沿轨道加速飞行（2 秒一周期+双层辉光拖尾） */
.railgun-projectile {
  position: absolute;
  top: 50%;
  left: -30px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle, #ffffff 15%, #FCD34D 55%, #00F5FF 85%, transparent 100%);
  /* 双层辉光拖尾 */
  box-shadow: 
    0 0 15px #ffffff,
    -20px 0 26px 3px rgba(252, 211, 77, 0.9),
    -50px 0 40px 6px rgba(0, 245, 255, 0.7);
  animation: projectileAccelerate 2s cubic-bezier(0.5, 0, 1, 1) infinite;
  pointer-events: none;
}

@keyframes projectileAccelerate {
  0% {
    left: -35px;
    opacity: 0;
    transform: translateY(-50%) scale(0.6);
  }
  15% {
    opacity: 1;
    transform: translateY(-50%) scale(1);
  }
  75% {
    opacity: 1;
    transform: translateY(-50%) scale(1.15);
  }
  100% {
    left: 375px;
    opacity: 0;
    transform: translateY(-50%) scale(0.8);
  }
}

/* 核心优势卡片 (3卡) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

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

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card), 0 0 30px rgba(0, 245, 255, 0.15);
}

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(0, 245, 255, 0.12);
  border: 1px solid rgba(0, 245, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
}

.feature-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-card-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.feature-tag-badge {
  font-size: 0.78rem;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 245, 255, 0.18);
  border-radius: var(--radius-full);
  color: var(--text-muted);
}

/* 流媒体与 AI 支持图卡 */
.media-ai-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(10px);
  position: relative;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
}

.card-head-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
}

.card-badge-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--accent-gold);
  background: rgba(252, 211, 77, 0.12);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-weight: 700;
  border: 1px solid rgba(252, 211, 77, 0.35);
  box-shadow: 0 0 12px rgba(252, 211, 77, 0.2);
}

.logo-badges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 26px;
}

.brand-badge {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.brand-badge:hover {
  background: rgba(0, 245, 255, 0.08);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.25);
  transform: translateY(-3px);
}

.brand-name {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-main);
}

.brand-feature {
  font-size: 0.72rem;
  color: var(--accent-gold);
  font-weight: 600;
}

.support-details {
  background: rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.support-details-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.support-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.support-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* 价格对比表 */
.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-color);
  border-radius: var(--radius-lg);
  padding: 38px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), 0 0 25px rgba(0, 245, 255, 0.2);
}

.pricing-card.featured {
  border-color: rgba(0, 245, 255, 0.7);
  background: linear-gradient(180deg, rgba(0, 245, 255, 0.08) 0%, rgba(6, 15, 38, 0.92) 100%);
  box-shadow: 0 10px 40px -10px rgba(0, 245, 255, 0.45);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #020617;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 2px 14px rgba(0, 245, 255, 0.5);
}

.pricing-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-subtitle {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 6px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-number {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  text-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

.price-period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.price-billing-sub {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-features {
  margin-bottom: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-muted);
}

.pricing-feature-item.highlight {
  color: var(--text-main);
  font-weight: 600;
}

.pricing-feature-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-fast);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 245, 255, 0.35);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: var(--accent-gold);
  margin-bottom: 14px;
  text-shadow: 0 0 10px rgba(252, 211, 77, 0.4);
}

.review-text {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  font-style: italic;
}

.review-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: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #020617;
  font-size: 0.95rem;
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.4);
}

.author-info h4 {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-main);
}

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

/* FAQ 常见问题 */
.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-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  overflow: hidden;
}

.faq-item[open] {
  border-color: rgba(0, 245, 255, 0.55);
  background: rgba(6, 18, 45, 0.95);
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.15);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--accent-cyan);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* 页脚 (只保留四个指定标题并新开页面展示) */
.footer {
  border-top: 1px solid var(--border-color);
  background: #01040f;
  padding: 48px 0 36px 0;
  margin-top: 40px;
  position: relative;
  z-index: 2;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 6px 4px;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.6);
}

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

/* 子页面独立通用模板样式 */
.subpage-hero {
  padding: 60px 0 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(6, 15, 38, 0.6);
  position: relative;
  z-index: 2;
}

.subpage-content {
  padding: 60px 0 100px 0;
  position: relative;
  z-index: 2;
}

.subpage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-card);
  max-width: 960px;
  margin: 0 auto;
}

.subpage-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-card h2:first-of-type {
  margin-top: 0;
}

.subpage-card p {
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 18px;
  font-size: 1rem;
}

.subpage-card ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 22px;
  color: var(--text-muted);
  line-height: 1.85;
}

/* ==========================================================================
   网站地图 - 现代小卡片系统 (Sitemap Card Grid)
   ========================================================================== */
.sitemap-group {
  margin-bottom: 44px;
}

.sitemap-group:last-of-type {
  margin-bottom: 20px;
}

.sitemap-group-header {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-group-header svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.sitemap-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.sitemap-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sitemap-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 245, 255, 0.18);
}

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

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

.sitemap-card-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: rgba(0, 245, 255, 0.1);
  border: 1px solid rgba(0, 245, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.sitemap-card-tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(0, 245, 255, 0.2);
  color: var(--accent-cyan);
}

.sitemap-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.sitemap-card-arrow {
  color: var(--accent-cyan);
  transition: transform var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

.sitemap-card:hover .sitemap-card-arrow {
  transform: translateX(4px);
  color: var(--accent-gold);
}

.sitemap-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.sitemap-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.sitemap-card.featured-card {
  border-color: rgba(252, 211, 77, 0.45);
  background: linear-gradient(135deg, rgba(6, 15, 38, 0.95) 0%, rgba(252, 211, 77, 0.08) 100%);
  box-shadow: 0 0 25px rgba(252, 211, 77, 0.15);
}

.sitemap-card.featured-card .sitemap-card-icon {
  background: rgba(252, 211, 77, 0.15);
  border-color: rgba(252, 211, 77, 0.4);
  color: var(--accent-gold);
}

.sitemap-card.featured-card .sitemap-card-tag {
  color: var(--accent-gold);
  border-color: rgba(252, 211, 77, 0.35);
  background: rgba(252, 211, 77, 0.08);
}

@media (max-width: 1024px) {
  .sitemap-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .sitemap-card-grid {
    grid-template-columns: 1fr;
  }
}

.subpage-back-nav {
  margin-bottom: 30px;
}

.subpage-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-cyan);
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform var(--transition-fast);
}

/* ==========================================================================
   SEO 知识库与文章增强样式
   ========================================================================== */
.seo-toc-container {
  background: rgba(6, 15, 38, 0.7);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  margin-bottom: 48px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.seo-toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.seo-toc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.seo-toc-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(0, 245, 255, 0.15);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.seo-toc-item:hover {
  background: rgba(0, 245, 255, 0.1);
  border-color: var(--accent-cyan);
  color: #fff;
  transform: translateX(4px);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
}

.seo-toc-num {
  width: 22px;
  height: 22px;
  background: var(--accent-gradient);
  border-radius: 50%;
  color: #020617;
  font-size: 0.75rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.seo-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 36px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-fast);
}

.seo-article-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), 0 0 25px rgba(0, 245, 255, 0.12);
}

.seo-article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.seo-article-card h2 {
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 18px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.seo-article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin: 24px 0 12px 0;
}

.seo-article-card p {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 16px;
  text-align: justify;
}

.seo-article-card strong {
  color: var(--text-main);
}

.seo-internal-link {
  color: var(--accent-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--transition-fast);
}

.seo-internal-link:hover {
  color: var(--accent-gold);
  text-shadow: 0 0 10px rgba(252, 211, 77, 0.5);
}

@media (max-width: 1024px) {
  .seo-toc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .seo-toc-grid {
    grid-template-columns: 1fr;
  }
  .seo-article-card {
    padding: 24px 20px;
  }
  .seo-article-card h2 {
    font-size: 1.3rem;
  }
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏与舒适触控
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
    max-width: 100%;
  }
  
  .hero-railgun-visual {
    right: -20px;
    left: auto;
    top: 14%;
    transform: scale(0.85);
    opacity: 0.65;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .media-ai-container {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .header {
    padding: 12px 0 10px 0;
  }
  
  .nav-wrap {
    flex-wrap: wrap;
    row-gap: 12px;
  }
  
  .nav-links {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding: 4px 0;
    gap: 12px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  
  .nav-link {
    font-size: 0.86rem;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-btn);
    border: 1px solid var(--border-color);
  }
  
  .hero {
    padding: 48px 0 36px 0;
  }
  
  .hero-railgun-visual {
    top: 5%;
    right: -60px;
    left: auto;
    transform: scale(0.65);
    opacity: 0.35;
  }
  
  .hero-title {
    font-size: 2.15rem;
    letter-spacing: -0.5px;
  }
  
  .hero-intro {
    padding: 20px 18px;
  }
  
  .hero-actions {
    flex-direction: column;
    gap: 14px;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
    padding: 16px 20px;
    font-size: 1.05rem;
  }
  
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }
  
  .metric-value {
    font-size: 1.6rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .feature-card {
    padding: 26px 20px;
  }
  
  .media-ai-card {
    padding: 24px 18px;
  }
  
  .logo-badges-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  
  .support-details-list {
    grid-template-columns: 1fr;
  }
  
  .pricing-card {
    padding: 30px 20px;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .faq-question {
    padding: 18px 18px;
    font-size: 0.98rem;
  }
  
  .faq-answer {
    padding: 0 18px 18px 18px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
  
  .footer-link {
    font-size: 1.05rem;
    padding: 10px;
    width: 100%;
    text-align: center;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-btn);
  }
  
  .subpage-card {
    padding: 26px 18px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  
  .hero-metrics {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   无障碍 (Accessibility) 与高质量验收强化规则
   ========================================================================== */

/* 1. 键盘跳过直达主内容链接 (Skip to main content) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--bg-card);
  color: var(--accent-cyan);
  padding: 12px 24px;
  border-radius: var(--radius-btn);
  border: 2px solid var(--accent-cyan);
  font-weight: 800;
  font-size: 0.96rem;
  z-index: 10000;
  text-decoration: none;
  box-shadow: 0 0 30px rgba(0, 245, 255, 0.65);
  transition: top var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 16px;
  outline: none;
}

/* 2. 键盘可访问清晰焦点态 (:focus-visible) */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}

/* 3. 固定页眉防遮挡锚点滚动外边距 (scroll-margin-top) */
.section,
.seo-article-card,
[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 4. 长文本防横向撑破溢出 (overflow-wrap) */
body, h1, h2, h3, h4, p, a, span, .faq-answer {
  overflow-wrap: break-word;
}

/* 5. 减弱动画模式适配 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .particle-streak,
  .dashed-orbit-outer,
  .dashed-orbit-inner,
  .railgun-projectile,
  .rail-line {
    animation: none !important;
  }
}

/* 6. 移动端触摸区域最小 44x44px 体验强化 */
@media (max-width: 768px) {
  .nav-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  .footer-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}