/* ==========================================================================
   Fastlink - 激光极速流速设计系统 (Aggressive Laser-Shear Velocity UI)
   配色体系：暗夜隐形碳黑 (#0f1013) / 炽热激光血红 (#ff1e42) / 手术刀冷白 (#ffffff)
   结构哲学：12度凌厉前倾斜切平面 / 机械折角切线 / 前倾斜体排版 / 边缘激光流火动效
   ========================================================================== */

:root {
  /* 白天模式（默认）：钛金冷灰 + 激光血红 + 高对比度深碳字体 */
  --bg-carbon: #f6f7fa;
  --bg-carbon-subtle: #edf0f5;
  --bg-carbon-surface: #ffffff;
  --bg-carbon-elevated: #e4e7ee;
  
  --border-carbon: rgba(255, 30, 66, 0.22);
  --border-carbon-hard: rgba(15, 16, 19, 0.12);
  --border-carbon-active: #ff1e42;
  
  --text-surgical-white: #0a0c11;
  --text-steel-gray: #4a5568;
  --text-stealth-muted: #718096;
  
  --laser-crimson: #ff1e42;
  --laser-crimson-bright: #ff3355;
  --laser-crimson-dark: #cc0025;
  --laser-glow: rgba(255, 30, 66, 0.35);
  --laser-glow-soft: rgba(255, 30, 66, 0.12);
  
  --header-bg: rgba(246, 247, 250, 0.92);
  --header-border: rgba(15, 16, 19, 0.08);
  
  --shadow-laser: 0 0 25px rgba(255, 30, 66, 0.3);
  --shadow-panel: 0 10px 30px rgba(0, 0, 0, 0.06);
  
  --slant-angle: -10deg;
  --transition-laser: 0.15s cubic-bezier(0.1, 0.9, 0.2, 1);
}

/* 夜间模式：暗夜隐形碳黑 (#0f1013) + 炽热激光血红 (#ff1e42) + 手术刀冷白 */
body.dark-mode {
  --bg-carbon: #0f1013;
  --bg-carbon-subtle: #14161b;
  --bg-carbon-surface: #171920;
  --bg-carbon-elevated: #1e212b;
  
  --border-carbon: rgba(255, 30, 66, 0.32);
  --border-carbon-hard: rgba(255, 255, 255, 0.08);
  --border-carbon-active: #ff1e42;
  
  --text-surgical-white: #ffffff;
  --text-steel-gray: #a2adb9;
  --text-stealth-muted: #647082;
  
  --laser-crimson: #ff1e42;
  --laser-crimson-bright: #ff3b5c;
  --laser-crimson-dark: #b80020;
  --laser-glow: rgba(255, 30, 66, 0.55);
  --laser-glow-soft: rgba(255, 30, 66, 0.18);
  
  --header-bg: rgba(15, 16, 19, 0.92);
  --header-border: rgba(255, 30, 66, 0.22);
  
  --shadow-laser: 0 0 30px rgba(255, 30, 66, 0.45);
  --shadow-panel: 0 14px 40px rgba(0, 0, 0, 0.7);
}

/* 基础重置与平滑滚动 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  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-carbon);
  color: var(--text-surgical-white);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* 激光流速网格背景与扫描线 (零耗能原生 CSS) */
.laser-grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(to right, rgba(255, 30, 66, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 30, 66, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -2;
}

.laser-beam-1 {
  position: fixed;
  top: 0;
  left: 15%;
  width: 1px;
  height: 100vh;
  background: linear-gradient(180deg, transparent, rgba(255, 30, 66, 0.4), transparent);
  pointer-events: none;
  z-index: -1;
  opacity: 0.7;
}

.laser-beam-2 {
  position: fixed;
  top: 0;
  right: 18%;
  width: 1px;
  height: 100vh;
  background: linear-gradient(180deg, transparent, rgba(255, 30, 66, 0.25), transparent);
  pointer-events: none;
  z-index: -1;
  opacity: 0.5;
}

/* 容器定义 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 920px;
}

/* 文字与前倾排版体系 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-surgical-white);
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.text-crimson {
  color: var(--laser-crimson) !important;
}

.brand-strike {
  display: inline-block;
  color: var(--laser-crimson);
  font-style: italic;
  font-weight: 900;
  text-shadow: 0 0 20px var(--laser-glow);
  letter-spacing: 0.02em;
}

p {
  color: var(--text-steel-gray);
}

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

/* 顶部导航栏 (凌厉锐角与扫描底线) */
.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--header-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--header-border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

/* 品牌 Logo 与旋转 */
.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  box-shadow: 0 0 15px var(--laser-glow);
  border: 1.5px solid var(--laser-crimson);
  animation: spinLogo 6s linear infinite;
  transform-origin: center center;
  will-change: transform;
  flex-shrink: 0;
}

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

.logo-text {
  font-size: 1.45rem;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  color: var(--text-surgical-white);
}

.logo-text::after {
  content: "⚡";
  font-size: 0.85rem;
  margin-left: 4px;
  color: var(--laser-crimson);
  font-style: normal;
}

/* 导航链接 (前倾几何线条，带平滑跳转) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-links li a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-steel-gray);
  padding: 6px 4px;
  position: relative;
  transition: all var(--transition-laser);
  display: inline-block;
}

.nav-links li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--laser-crimson);
  box-shadow: 0 0 8px var(--laser-crimson);
  transition: width 0.2s cubic-bezier(0.1, 0.9, 0.2, 1);
  transform: skewX(var(--slant-angle));
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--laser-crimson);
  transform: translateY(-1px);
}

.nav-links li a:hover::after,
.nav-links li a.active::after {
  width: 100%;
}

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

/* 精致专业昼夜切换按钮 */
.theme-toggle-btn {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon);
  width: 38px;
  height: 38px;
  border-radius: 6px;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-steel-gray);
  transition: all 0.2s ease;
  padding: 0;
  outline: none;
}

.theme-toggle-btn:hover {
  color: var(--laser-crimson);
  border-color: var(--laser-crimson);
  box-shadow: 0 0 12px var(--laser-glow-soft);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

.theme-toggle-btn .sun-icon { display: none; }
.theme-toggle-btn .moon-icon { display: block; }
body.dark-mode .theme-toggle-btn .sun-icon { display: block; }
body.dark-mode .theme-toggle-btn .moon-icon { display: none; }

/* 凌厉激光流速按钮 (Laser Velocity Buttons) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 750;
  font-style: italic;
  padding: 11px 24px;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.02em;
  transition: all 0.18s cubic-bezier(0.1, 0.9, 0.2, 1);
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #ff1e42 0%, #b80020 100%);
  color: #ffffff !important;
  border-color: #ff3355;
  box-shadow: 0 0 20px rgba(255, 30, 66, 0.35);
}

/* 边缘飞奔霓虹流火动效 (Edge-Running Neon Spark) */
.laser-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
  transform: skewX(-20deg);
  transition: none;
}

.laser-btn:hover::before {
  animation: laserSweep 0.75s infinite linear;
}

@keyframes laserSweep {
  0% { left: -100%; }
  100% { left: 200%; }
}

.btn-primary:hover {
  box-shadow: 0 0 35px rgba(255, 30, 66, 0.7);
  transform: translateY(-2px) scale(1.02);
  border-color: #ffffff;
}

.btn-outline {
  background: var(--bg-carbon-surface);
  color: var(--text-surgical-white);
  border-color: var(--border-carbon);
}

.btn-outline:hover {
  border-color: var(--laser-crimson);
  color: var(--laser-crimson);
  box-shadow: 0 0 18px var(--laser-glow-soft);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.08rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

/* 主视觉区 (Hero Section - 12度斜切与流速HUD) */
.hero {
  padding: 80px 0 65px;
  position: relative;
}

.hero-cutline-top {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  font-size: 0.82rem;
  font-weight: 750;
  font-style: italic;
  letter-spacing: 0.05em;
  color: var(--laser-crimson);
  margin-bottom: 24px;
}

.laser-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--laser-crimson);
  box-shadow: 0 0 8px var(--laser-crimson);
  animation: laserPulse 1.2s infinite ease-in-out;
}

@keyframes laserPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.7); }
}

.hero-title {
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 900;
  font-style: italic;
  line-height: 1.12;
  margin-bottom: 22px;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-steel-gray);
  max-width: 780px;
  margin-bottom: 38px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 60px;
  flex-wrap: wrap;
}

/* 凌厉机械节点 HUD 监控仪表栏 (Sub-millisecond Razor-Slice Displacement) */
.route-hud-panel {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon);
  border-left: 4px solid var(--laser-crimson);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  padding: 24px 28px;
  box-shadow: var(--shadow-panel);
  position: relative;
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-carbon-hard);
}

.hud-title {
  font-size: 0.85rem;
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--laser-crimson);
  text-transform: uppercase;
}

.hud-routes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

/* 悬停瞬间剃刀位移切入交互 */
.hud-route-item {
  background: var(--bg-carbon-subtle);
  border: 1px solid var(--border-carbon-hard);
  padding: 14px 18px;
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  position: relative;
  transition: all 0.08s cubic-bezier(0, 1, 0, 1); /* 亚毫秒级瞬切 */
  overflow: hidden;
}

.hud-route-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--laser-crimson);
  opacity: 0;
  transition: opacity 0.05s ease;
}

.hud-route-item:hover {
  transform: translateX(4px) skewX(var(--slant-angle));
  border-color: var(--laser-crimson);
  box-shadow: 0 0 18px var(--laser-glow-soft);
  background: var(--bg-carbon-elevated);
}

.hud-route-item:hover::before {
  opacity: 1;
}

.route-name {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-steel-gray);
}

.route-latency {
  font-size: 1.35rem;
  font-weight: 900;
  font-style: italic;
  color: var(--text-surgical-white);
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.route-latency .ms {
  font-size: 0.8rem;
  color: var(--laser-crimson);
}

.route-status-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: #10b981;
  letter-spacing: 0.04em;
}

/* 公共分节与 12度凌厉斜切标题 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-angled-divider {
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--laser-crimson), transparent);
  margin: 0 auto;
  opacity: 0.35;
}

.section-header-laser {
  margin-bottom: 55px;
}

.section-tag-laser {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 850;
  font-style: italic;
  letter-spacing: 0.12em;
  color: var(--laser-crimson);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title-laser {
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-desc-laser {
  font-size: 1.05rem;
  color: var(--text-steel-gray);
  max-width: 720px;
}

/* 核心优势 (3个图文削角平面) */
.features-grid-laser {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-plane {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
  border-top: 3px solid var(--laser-crimson);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  padding: 38px 30px;
  transition: all var(--transition-laser);
  position: relative;
}

.feature-plane:hover {
  transform: translateY(-6px);
  border-color: var(--laser-crimson);
  box-shadow: 0 14px 35px var(--laser-glow-soft);
}

.feature-num-stamp {
  font-size: 1.25rem;
  font-weight: 900;
  font-style: italic;
  color: var(--laser-crimson);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}

.feature-title-laser {
  font-size: 1.35rem;
  font-weight: 850;
  font-style: italic;
  margin-bottom: 14px;
  color: var(--text-surgical-white);
}

.feature-desc-laser {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-steel-gray);
  margin-bottom: 24px;
}

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

.feature-tag-laser {
  font-size: 0.76rem;
  font-weight: 750;
  padding: 4px 10px;
  background: var(--bg-carbon-subtle);
  border: 1px solid var(--border-carbon-hard);
  color: var(--text-steel-gray);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

/* 流媒体与 AI 支持图卡 (双列重型机械切面板块) */
.media-ai-grid-laser {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.media-ai-plane {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  padding: 42px 36px;
  position: relative;
  transition: all var(--transition-laser);
}

.media-ai-plane:hover {
  box-shadow: var(--shadow-laser);
  border-color: var(--laser-crimson);
}

.media-ai-plane::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, transparent 50%, var(--laser-crimson) 50%);
  opacity: 0.6;
}

.media-ai-badge-laser {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--laser-crimson);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.media-ai-title-laser {
  font-size: 1.6rem;
  font-weight: 900;
  font-style: italic;
  margin-bottom: 14px;
}

.media-ai-desc-laser {
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-steel-gray);
  margin-bottom: 28px;
}

.service-pills-laser {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.service-pill-laser {
  background: var(--bg-carbon-subtle);
  border: 1px solid var(--border-carbon-hard);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--text-surgical-white);
  transition: all var(--transition-laser);
}

.service-pill-laser:hover {
  background: var(--bg-carbon-elevated);
  border-color: var(--laser-crimson);
  transform: translateX(3px);
}

.dot-crimson {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--laser-crimson);
  box-shadow: 0 0 6px var(--laser-crimson);
  flex-shrink: 0;
}

/* 套餐价格对比表 (参考网上真实套餐价格行情) */
.pricing-grid-laser {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-plane {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  padding: 44px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-laser);
}

.pricing-plane:hover {
  transform: translateY(-6px);
  border-color: var(--border-carbon);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

/* 推荐热门套餐 (12度斜切高亮) */
.pricing-plane.popular {
  border: 2px solid var(--laser-crimson);
  box-shadow: var(--shadow-laser);
  background: var(--bg-carbon-surface);
}

.popular-ribbon {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--laser-crimson);
  color: #ffffff;
  font-size: 0.74rem;
  font-weight: 850;
  font-style: italic;
  padding: 4px 18px;
  letter-spacing: 0.05em;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 14px 100%);
}

.pricing-tier-title {
  font-size: 1.4rem;
  font-weight: 900;
  font-style: italic;
  margin-bottom: 6px;
}

.pricing-tier-desc {
  font-size: 0.88rem;
  color: var(--text-steel-gray);
  margin-bottom: 24px;
}

.pricing-price-display {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px dashed var(--border-carbon-hard);
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 850;
  color: var(--laser-crimson);
}

.price-val {
  font-size: 3rem;
  font-weight: 950;
  font-style: italic;
  line-height: 1;
  color: var(--text-surgical-white);
}

.price-term {
  font-size: 0.86rem;
  color: var(--text-stealth-muted);
}

.pricing-features-laser {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.pricing-features-laser li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-steel-gray);
}

.pricing-features-laser li.key-feature {
  color: var(--text-surgical-white);
  font-weight: 700;
}

.laser-tick {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--laser-crimson);
  flex-shrink: 0;
}

.laser-tick svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

/* 用户真实口碑 (Testimonials) */
.testimonials-grid-laser {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-plane {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-laser);
}

.testimonial-plane:hover {
  border-color: var(--border-carbon);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.testimonial-rating-stars {
  display: flex;
  gap: 4px;
  color: var(--laser-crimson);
  margin-bottom: 16px;
}

.testimonial-text-laser {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--text-steel-gray);
  margin-bottom: 24px;
}

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

.author-badge-hex {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--laser-crimson) 0%, #1a1d24 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 850;
  font-style: italic;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  flex-shrink: 0;
}

.author-meta h4 {
  font-size: 0.92rem;
  font-weight: 800;
}

.author-meta p {
  font-size: 0.78rem;
  color: var(--text-stealth-muted);
}

/* 常见问题 (FAQ 纯原生折叠手风琴) */
.faq-list-laser {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item-laser {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: border-color var(--transition-laser);
  overflow: hidden;
}

.faq-item-laser:hover,
.faq-item-laser.active {
  border-color: var(--laser-crimson);
}

.faq-btn-laser {
  width: 100%;
  padding: 22px 26px;
  background: transparent;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-surgical-white);
}

.faq-arrow {
  color: var(--laser-crimson);
  transition: transform 0.2s cubic-bezier(0.1, 0.9, 0.2, 1);
  font-size: 1.2rem;
  font-style: italic;
  font-weight: 900;
}

.faq-item-laser.active .faq-arrow {
  transform: rotate(90deg);
}

.faq-content-laser {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s cubic-bezier(0.1, 0.9, 0.2, 1);
  padding: 0 26px;
}

.faq-item-laser.active .faq-content-laser {
  max-height: 400px;
  padding-bottom: 22px;
}

.faq-content-laser p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-steel-gray);
}

/* 底部斜切号召横幅 */
.cta-banner-angled {
  background: linear-gradient(135deg, #171920 0%, #0f1013 100%);
  border: 2px solid var(--laser-crimson);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  box-shadow: var(--shadow-laser);
  padding: 55px 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 70px auto 40px;
  flex-wrap: wrap;
  gap: 24px;
}

body.dark-mode .cta-banner-angled {
  background: linear-gradient(135deg, #141720 0%, #0b0c0f 100%);
}

.cta-banner-content h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-style: italic;
  margin-bottom: 8px;
}

.cta-banner-content p {
  font-size: 1.05rem;
  color: var(--text-steel-gray);
}

/* 页脚 (严格遵守要求：只保留四个标题，在新页面打开) */
.footer {
  border-top: 1px solid var(--header-border);
  background-color: var(--bg-carbon-surface);
  padding: 55px 0 35px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 46px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 1.02rem;
  font-weight: 750;
  font-style: italic;
  color: var(--text-surgical-white);
  letter-spacing: 0.02em;
  position: relative;
  padding: 4px 0;
}

.footer-nav a:hover {
  color: var(--laser-crimson);
}

.footer-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--laser-crimson);
  box-shadow: 0 0 8px var(--laser-crimson);
  transition: width 0.2s ease;
}

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

.footer-divider {
  width: 100%;
  max-width: 650px;
  height: 1px;
  background: var(--border-carbon-hard);
  margin: 0 auto 22px;
}

.footer-bottom {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-stealth-muted);
}

.footer-bottom a {
  color: var(--text-steel-gray);
}

.footer-bottom a:hover {
  color: var(--laser-crimson);
}

/* 子页面通用排版 (推荐资讯 / 关于我们 / 服务条款 / 隐私政策 / 网站地图) */
.subpage-hero {
  padding: 65px 0 45px;
  border-bottom: 1px solid var(--border-carbon-hard);
  background: var(--bg-carbon-subtle);
}

.hero-title-sub {
  font-size: clamp(2rem, 3.5vw, 2.7rem);
  font-weight: 900;
  font-style: italic;
  margin-bottom: 10px;
}

.subpage-content {
  padding: 60px 0 90px;
}

.subpage-card-laser {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  padding: 46px;
  box-shadow: var(--shadow-panel);
}

.subpage-card-laser h2 {
  font-size: 1.45rem;
  font-style: italic;
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-carbon-hard);
  color: var(--text-surgical-white);
}

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

.subpage-card-laser p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
  color: var(--text-steel-gray);
}

.subpage-card-laser ul, .subpage-card-laser ol {
  margin-left: 24px;
  margin-bottom: 22px;
  color: var(--text-steel-gray);
  line-height: 1.8;
}

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

.info-box-laser {
  background: var(--bg-carbon-subtle);
  border-left: 4px solid var(--laser-crimson);
  padding: 18px 22px;
  margin: 24px 0;
}

.info-box-laser p {
  margin-bottom: 0;
  color: var(--text-surgical-white);
  font-weight: 600;
}

/* 推荐资讯卡片网格 */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.insight-card {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  padding: 34px 30px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-laser);
}

.insight-card:hover {
  transform: translateY(-5px);
  border-color: var(--laser-crimson);
  box-shadow: 0 12px 30px var(--laser-glow-soft);
}

.insight-badge {
  font-size: 0.76rem;
  font-weight: 800;
  font-style: italic;
  color: var(--laser-crimson);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.insight-date {
  font-size: 0.8rem;
  color: var(--text-stealth-muted);
  margin-bottom: 12px;
}

.insight-title {
  font-size: 1.25rem;
  font-weight: 850;
  margin-bottom: 12px;
  line-height: 1.35;
}

.insight-excerpt {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--text-steel-gray);
  margin-bottom: 22px;
  flex-grow: 1;
}

.insight-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px dashed var(--border-carbon-hard);
}

.insight-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  background: var(--bg-carbon-subtle);
  border: 1px solid var(--border-carbon-hard);
  color: var(--text-steel-gray);
}

.insight-link {
  font-size: 0.88rem;
  font-weight: 800;
  font-style: italic;
  color: var(--laser-crimson);
}

.insight-link:hover {
  text-shadow: 0 0 10px var(--laser-glow);
}

/* 网站地图样式适配 */
.sitemap-grid-laser {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 26px;
  margin-top: 24px;
}

.sitemap-block-laser {
  background: var(--bg-carbon-subtle);
  border: 1px solid var(--border-carbon-hard);
  padding: 24px;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.sitemap-block-laser h3 {
  font-size: 1.12rem;
  font-style: italic;
  margin-bottom: 16px;
  color: var(--laser-crimson);
}

.sitemap-block-laser ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-block-laser li {
  margin-bottom: 10px;
}

.sitemap-block-laser a {
  color: var(--text-surgical-white);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-block-laser a:hover {
  color: var(--laser-crimson);
  transform: translateX(4px);
}

/* ==========================================================================
   移动端响应式媒体查询 (@media) - 单栏流式排版与手指点击优化
   ========================================================================== */

@media (max-width: 1024px) {
  .features-grid-laser,
  .pricing-grid-laser,
  .testimonials-grid-laser,
  .hud-routes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }
  
  .nav-wrap {
    height: 66px;
  }
  
  .nav-links {
    display: none; /* 移动端精简顶部，使用页面内快速触达与锚点 */
  }
  
  .hero {
    padding: 50px 0 40px;
  }
  
  .hero-title {
    font-size: 2.15rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 28px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .hud-routes-grid,
  .features-grid-laser,
  .media-ai-grid-laser,
  .pricing-grid-laser,
  .testimonials-grid-laser,
  .insights-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .service-pills-laser {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section {
    padding: 55px 0;
  }
  
  .feature-plane,
  .media-ai-plane,
  .pricing-plane,
  .testimonial-plane,
  .subpage-card-laser {
    padding: 26px 20px;
  }
  
  .cta-banner-angled {
    padding: 36px 22px;
    flex-direction: column;
    text-align: center;
  }
  
  .cta-banner-angled .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
}

/* ==========================================================================
   长篇深度 SEO 文章专用排版体系 (Article Reader & SEO Optimization)
   ========================================================================== */

.article-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-header {
  padding: 50px 0 30px;
  border-bottom: 1px solid var(--border-carbon-hard);
  margin-bottom: 36px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-stealth-muted);
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-title-main {
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  font-weight: 900;
  font-style: italic;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.03em;
}

.article-lead {
  font-size: 1.12rem;
  line-height: 1.8;
  color: var(--text-steel-gray);
  border-left: 3px solid var(--laser-crimson);
  padding-left: 18px;
  margin-bottom: 24px;
  background: var(--bg-carbon-subtle);
  padding: 16px 20px;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

/* 目录 (Table of Contents) */
.article-toc {
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  padding: 26px 30px;
  margin: 32px 0 46px;
  box-shadow: var(--shadow-panel);
}

.article-toc-title {
  font-size: 1.15rem;
  font-weight: 850;
  font-style: italic;
  color: var(--laser-crimson);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-toc-list li a {
  color: var(--text-steel-gray);
  font-size: 0.96rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-laser);
}

.article-toc-list li a:hover {
  color: var(--laser-crimson);
  transform: translateX(4px);
}

/* 正文深度排版 */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-steel-gray);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 900;
  font-style: italic;
  color: var(--text-surgical-white);
  margin: 48px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-carbon-hard);
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 850;
  color: var(--text-surgical-white);
  margin: 32px 0 14px;
}

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

.article-body strong {
  color: var(--text-surgical-white);
}

.article-body ul, .article-body ol {
  margin-left: 24px;
  margin-bottom: 24px;
  line-height: 1.85;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body a {
  color: var(--laser-crimson);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 600;
}

.article-body a:hover {
  text-shadow: 0 0 8px var(--laser-glow);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 30px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
}

.article-table th {
  background: var(--bg-carbon-subtle);
  color: var(--text-surgical-white);
  font-weight: 800;
  padding: 14px 18px;
  text-align: left;
  border-bottom: 2px solid var(--laser-crimson);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-carbon-hard);
  color: var(--text-steel-gray);
}

.article-table tr:hover td {
  background: var(--bg-carbon-elevated);
}

/* 文章 FAQ 模块 */
.article-faq-section {
  margin: 55px 0 45px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-carbon-hard);
}

.article-faq-title {
  font-size: 1.55rem;
  font-weight: 900;
  font-style: italic;
  margin-bottom: 24px;
  color: var(--text-surgical-white);
}

/* 相关阅读模块 */
.article-related-section {
  margin: 50px 0;
  padding: 38px 30px;
  background: var(--bg-carbon-surface);
  border: 1px solid var(--border-carbon-hard);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.article-related-title {
  font-size: 1.3rem;
  font-weight: 850;
  font-style: italic;
  color: var(--laser-crimson);
  margin-bottom: 20px;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.article-related-card {
  background: var(--bg-carbon-subtle);
  border: 1px solid var(--border-carbon-hard);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition-laser);
}

.article-related-card:hover {
  border-color: var(--laser-crimson);
  transform: translateX(4px);
}

.article-related-card h4 {
  font-size: 0.98rem;
  font-weight: 750;
  color: var(--text-surgical-white);
  line-height: 1.4;
}

.article-related-card span {
  font-size: 0.82rem;
  color: var(--laser-crimson);
  font-weight: 700;
}

@media (max-width: 768px) {
  .article-container {
    padding: 0 16px;
  }
  .article-title-main {
    font-size: 1.85rem;
  }
  .article-lead {
    font-size: 1rem;
    padding: 14px 16px;
  }
  .article-related-grid {
    grid-template-columns: 1fr;
  }
  .article-toc {
    padding: 20px 18px;
  }
}