/* ===================================================================
   青云梯 QingYunTi - 机械工业科技风格主样式表 (Mecha Industrial Theme)
   纯原生 CSS | 机械网格复合背景 | 40组悬浮高能颗粒 | 机械齿轮动效 | 零外部依赖秒开
   =================================================================== */

:root {
  --bg-primary: #060911;
  --bg-secondary: #0b101c;
  --bg-tertiary: #101726;
  --bg-card: rgba(12, 19, 32, 0.78);
  --bg-card-hover: rgba(18, 28, 46, 0.92);
  
  --border-color: rgba(0, 240, 255, 0.18);
  --border-highlight: rgba(0, 240, 255, 0.6);
  --border-amber: rgba(245, 158, 11, 0.4);
  
  --primary: #00f0ff;
  --primary-hover: #00c8d7;
  --primary-gradient: linear-gradient(135deg, #00f0ff 0%, #3b82f6 50%, #f59e0b 100%);
  --metal-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.02) 100%);
  
  --accent-cyan: #00f0ff;
  --accent-amber: #f59e0b;
  --accent-green: #10b981;
  --accent-steel: #94a3b8;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 30px -8px rgba(0, 0, 0, 0.7), 0 0 20px rgba(0, 240, 255, 0.15);
  --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.35), inset 0 0 15px rgba(0, 240, 255, 0.08);
  --shadow-amber: 0 0 25px rgba(245, 158, 11, 0.3);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --max-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 机械风格复合背景：蓝图网格 + 工业微纹理 + 能量光晕 */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-color: var(--bg-primary);
  background-image: 
    linear-gradient(rgba(0, 240, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.04) 1px, transparent 1px),
    linear-gradient(rgba(0, 240, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.08) 1px, transparent 1px),
    linear-gradient(45deg, rgba(255, 255, 255, 0.012) 25%, transparent 25%, transparent 75%, rgba(255, 255, 255, 0.012) 75%),
    radial-gradient(circle at 50% 0%, rgba(0, 240, 255, 0.16) 0%, rgba(11, 16, 28, 0.8) 60%),
    radial-gradient(circle at 85% 50%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 15% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
  background-size: 
    20px 20px, 20px 20px, 
    100px 100px, 100px 100px, 
    8px 8px, 
    100% 100%, 100% 100%, 100% 100%;
  background-attachment: fixed;
}

/* ===================================================================
   背景悬浮颗粒系统 (40组高能微粒 + 环境光尘)
   =================================================================== */
.mech-particles-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.mech-particle {
  position: absolute;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan);
  opacity: 0.6;
  animation: mechParticleFloat linear infinite;
}

/* 各颗粒随机轨迹与延迟（40组） */
.mech-particle:nth-child(1) { width: 2px; height: 2px; left: 1.5%; bottom: -20px; animation-duration: 22.9s; animation-delay: -19.1s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.73; }
.mech-particle:nth-child(2) { width: 3px; height: 3px; left: 4.0%; bottom: -20px; animation-duration: 15.0s; animation-delay: -14.9s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.44; }
.mech-particle:nth-child(3) { width: 2.5px; height: 2.5px; left: 5.7%; bottom: -20px; animation-duration: 14.3s; animation-delay: -20.2s; background: #34d399; box-shadow: 0 0 8px #34d399, 0 0 14px #34d399; opacity: 0.72; }
.mech-particle:nth-child(4) { width: 2px; height: 2px; left: 8.5%; bottom: -20px; animation-duration: 21.1s; animation-delay: -5.6s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.74; }
.mech-particle:nth-child(5) { width: 5px; height: 5px; left: 10.5%; bottom: -20px; animation-duration: 18.1s; animation-delay: -21.3s; background: #ffffff; box-shadow: 0 0 6px #ffffff, 0 0 12px var(--accent-cyan); opacity: 0.55; }
.mech-particle:nth-child(6) { width: 2.5px; height: 2.5px; left: 12.9%; bottom: -20px; animation-duration: 18.3s; animation-delay: -16.7s; background: var(--accent-amber); box-shadow: 0 0 8px var(--accent-amber), 0 0 14px var(--accent-amber); opacity: 0.76; }
.mech-particle:nth-child(7) { width: 3px; height: 3px; left: 16.3%; bottom: -20px; animation-duration: 15.5s; animation-delay: -2.9s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.65; }
.mech-particle:nth-child(8) { width: 2.5px; height: 2.5px; left: 18.9%; bottom: -20px; animation-duration: 24.6s; animation-delay: -16.3s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.72; }
.mech-particle:nth-child(9) { width: 3.5px; height: 3.5px; left: 20.2%; bottom: -20px; animation-duration: 23.3s; animation-delay: -1.4s; background: #ffffff; box-shadow: 0 0 6px #ffffff, 0 0 12px var(--accent-cyan); opacity: 0.5; }
.mech-particle:nth-child(10) { width: 4px; height: 4px; left: 22.7%; bottom: -20px; animation-duration: 19.4s; animation-delay: -5.0s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.57; }
.mech-particle:nth-child(11) { width: 4px; height: 4px; left: 25.3%; bottom: -20px; animation-duration: 22.4s; animation-delay: -8.6s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.67; }
.mech-particle:nth-child(12) { width: 3.5px; height: 3.5px; left: 27.7%; bottom: -20px; animation-duration: 16.0s; animation-delay: -15.9s; background: #34d399; box-shadow: 0 0 8px #34d399, 0 0 14px #34d399; opacity: 0.71; }
.mech-particle:nth-child(13) { width: 4.5px; height: 4.5px; left: 30.2%; bottom: -20px; animation-duration: 24.1s; animation-delay: -6.4s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.77; }
.mech-particle:nth-child(14) { width: 5px; height: 5px; left: 33.6%; bottom: -20px; animation-duration: 17.2s; animation-delay: -19.9s; background: #38bdf8; box-shadow: 0 0 8px #38bdf8, 0 0 16px #38bdf8; opacity: 0.79; }
.mech-particle:nth-child(15) { width: 2px; height: 2px; left: 35.3%; bottom: -20px; animation-duration: 18.7s; animation-delay: -3.1s; background: var(--accent-amber); box-shadow: 0 0 6px var(--accent-amber); opacity: 0.46; }
.mech-particle:nth-child(16) { width: 3px; height: 3px; left: 37.5%; bottom: -20px; animation-duration: 20.5s; animation-delay: -7.1s; background: var(--accent-amber); box-shadow: 0 0 6px var(--accent-amber); opacity: 0.8; }
.mech-particle:nth-child(17) { width: 3.5px; height: 3.5px; left: 40.3%; bottom: -20px; animation-duration: 26.0s; animation-delay: -21.7s; background: var(--accent-amber); box-shadow: 0 0 6px var(--accent-amber); opacity: 0.44; }
.mech-particle:nth-child(18) { width: 2.5px; height: 2.5px; left: 42.2%; bottom: -20px; animation-duration: 15.8s; animation-delay: -21.2s; background: #34d399; box-shadow: 0 0 8px #34d399, 0 0 14px #34d399; opacity: 0.59; }
.mech-particle:nth-child(19) { width: 5px; height: 5px; left: 44.7%; bottom: -20px; animation-duration: 21.2s; animation-delay: -13.8s; background: var(--accent-amber); box-shadow: 0 0 8px var(--accent-amber), 0 0 14px var(--accent-amber); opacity: 0.84; }
.mech-particle:nth-child(20) { width: 2px; height: 2px; left: 48.3%; bottom: -20px; animation-duration: 22.2s; animation-delay: -22.3s; background: #38bdf8; box-shadow: 0 0 8px #38bdf8, 0 0 16px #38bdf8; opacity: 0.74; }
.mech-particle:nth-child(21) { width: 4.5px; height: 4.5px; left: 50.7%; bottom: -20px; animation-duration: 15.3s; animation-delay: -14.6s; background: var(--accent-amber); box-shadow: 0 0 6px var(--accent-amber); opacity: 0.4; }
.mech-particle:nth-child(22) { width: 4px; height: 4px; left: 53.0%; bottom: -20px; animation-duration: 25.7s; animation-delay: -6.7s; background: #38bdf8; box-shadow: 0 0 8px #38bdf8, 0 0 16px #38bdf8; opacity: 0.81; }
.mech-particle:nth-child(23) { width: 4px; height: 4px; left: 55.7%; bottom: -20px; animation-duration: 24.1s; animation-delay: -12.8s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.47; }
.mech-particle:nth-child(24) { width: 3px; height: 3px; left: 58.0%; bottom: -20px; animation-duration: 25.4s; animation-delay: -2.9s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.67; }
.mech-particle:nth-child(25) { width: 2.5px; height: 2.5px; left: 60.0%; bottom: -20px; animation-duration: 25.1s; animation-delay: -3.9s; background: #ffffff; box-shadow: 0 0 6px #ffffff, 0 0 12px var(--accent-cyan); opacity: 0.76; }
.mech-particle:nth-child(26) { width: 3.5px; height: 3.5px; left: 62.1%; bottom: -20px; animation-duration: 24.5s; animation-delay: -2.3s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.73; }
.mech-particle:nth-child(27) { width: 3px; height: 3px; left: 65.4%; bottom: -20px; animation-duration: 23.2s; animation-delay: -21.9s; background: var(--accent-amber); box-shadow: 0 0 6px var(--accent-amber); opacity: 0.83; }
.mech-particle:nth-child(28) { width: 3px; height: 3px; left: 66.9%; bottom: -20px; animation-duration: 24.5s; animation-delay: -14.8s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.82; }
.mech-particle:nth-child(29) { width: 3.5px; height: 3.5px; left: 70.2%; bottom: -20px; animation-duration: 22.6s; animation-delay: -15.4s; background: #34d399; box-shadow: 0 0 8px #34d399, 0 0 14px #34d399; opacity: 0.69; }
.mech-particle:nth-child(30) { width: 3px; height: 3px; left: 72.2%; bottom: -20px; animation-duration: 19.4s; animation-delay: -19.1s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.55; }
.mech-particle:nth-child(31) { width: 3.5px; height: 3.5px; left: 74.9%; bottom: -20px; animation-duration: 21.1s; animation-delay: -24.8s; background: #34d399; box-shadow: 0 0 8px #34d399, 0 0 14px #34d399; opacity: 0.68; }
.mech-particle:nth-child(32) { width: 2px; height: 2px; left: 76.8%; bottom: -20px; animation-duration: 24.3s; animation-delay: -23.3s; background: var(--accent-cyan); box-shadow: 0 0 6px var(--accent-cyan); opacity: 0.53; }
.mech-particle:nth-child(33) { width: 3px; height: 3px; left: 79.6%; bottom: -20px; animation-duration: 15.6s; animation-delay: -2.5s; background: #38bdf8; box-shadow: 0 0 8px #38bdf8, 0 0 16px #38bdf8; opacity: 0.66; }
.mech-particle:nth-child(34) { width: 2px; height: 2px; left: 81.7%; bottom: -20px; animation-duration: 23.7s; animation-delay: -20.4s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.7; }
.mech-particle:nth-child(35) { width: 5px; height: 5px; left: 84.3%; bottom: -20px; animation-duration: 19.6s; animation-delay: -7.5s; background: #34d399; box-shadow: 0 0 8px #34d399, 0 0 14px #34d399; opacity: 0.69; }
.mech-particle:nth-child(36) { width: 2px; height: 2px; left: 87.2%; bottom: -20px; animation-duration: 18.8s; animation-delay: -16.9s; background: #ffffff; box-shadow: 0 0 6px #ffffff, 0 0 12px var(--accent-cyan); opacity: 0.45; }
.mech-particle:nth-child(37) { width: 3px; height: 3px; left: 89.0%; bottom: -20px; animation-duration: 19.4s; animation-delay: -14.9s; background: var(--accent-amber); box-shadow: 0 0 8px var(--accent-amber), 0 0 14px var(--accent-amber); opacity: 0.61; }
.mech-particle:nth-child(38) { width: 2.5px; height: 2.5px; left: 92.5%; bottom: -20px; animation-duration: 19.3s; animation-delay: -4.3s; background: #38bdf8; box-shadow: 0 0 8px #38bdf8, 0 0 16px #38bdf8; opacity: 0.44; }
.mech-particle:nth-child(39) { width: 3px; height: 3px; left: 94.6%; bottom: -20px; animation-duration: 24.0s; animation-delay: -1.7s; background: #ffffff; box-shadow: 0 0 6px #ffffff, 0 0 12px var(--accent-cyan); opacity: 0.78; }
.mech-particle:nth-child(40) { width: 2px; height: 2px; left: 96.3%; bottom: -20px; animation-duration: 19.8s; animation-delay: -4.2s; background: var(--accent-cyan); box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan); opacity: 0.47; }

/* 环境微粒子光尘图层 */
.mech-particles-layer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(1px 1px at 15% 20%, rgba(0, 240, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 35% 65%, rgba(245, 158, 11, 0.35), transparent),
    radial-gradient(1px 1px at 55% 15%, rgba(0, 240, 255, 0.35), transparent),
    radial-gradient(1.5px 1.5px at 75% 45%, rgba(0, 240, 255, 0.45), transparent),
    radial-gradient(1px 1px at 85% 85%, rgba(245, 158, 11, 0.3), transparent),
    radial-gradient(1px 1px at 25% 90%, rgba(56, 189, 248, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 65% 78%, rgba(52, 211, 153, 0.35), transparent),
    radial-gradient(1px 1px at 95% 30%, rgba(0, 240, 255, 0.35), transparent);
  background-size: 350px 350px;
  pointer-events: none;
  opacity: 0.8;
}

@keyframes mechParticleFloat {
  0% {
    transform: translateY(0) translateX(0) scale(0.8);
    opacity: 0;
  }
  15% {
    opacity: 0.8;
  }
  85% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-110vh) translateX(35px) scale(1.2);
    opacity: 0;
  }
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

img, svg {
  vertical-align: middle;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 80px 0;
  position: relative;
  z-index: 1;
}

/* 顶部导航栏（机械HUD装甲条） */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(6, 9, 17, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6), inset 0 -1px 0 rgba(0, 240, 255, 0.2);
  height: 72px;
  display: flex;
  align-items: center;
}

.header-inner {
  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;
  color: #ffffff;
}

.logo span {
  background: linear-gradient(135deg, #ffffff 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 2px;
  background: rgba(0, 240, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.4);
  -webkit-text-fill-color: var(--accent-cyan);
  letter-spacing: 1px;
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

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

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  transition: width 0.25s ease;
}

.nav-link:hover {
  color: #ffffff;
}

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

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

/* 按钮规范（机械切角与金属质感） */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
  border: none;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, #00d2df 0%, #2563eb 100%);
  color: #030712;
  font-weight: 800;
  border: 1px solid #00f0ff;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.65), 0 4px 15px rgba(0, 0, 0, 0.4);
  color: #000000;
}

.btn-secondary {
  background: rgba(16, 23, 38, 0.85);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.btn-secondary:hover {
  background: rgba(24, 34, 56, 0.95);
  border-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.1rem;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

/* 标头通用 */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  color: var(--accent-cyan);
  background: rgba(0, 240, 255, 0.08);
  padding: 4px 16px;
  border-radius: 2px;
  margin-bottom: 16px;
  border: 1px solid rgba(0, 240, 255, 0.3);
  box-shadow: inset 0 0 10px rgba(0, 240, 255, 0.15);
}

.section-title {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

/* ===================================================================
   主视觉区 Hero（双栏中控布局：左侧文本与操作，右侧巨幅机械动力核心）
   =================================================================== */
.hero {
  padding: 80px 0 70px 0;
  text-align: left;
  position: relative;
}

.hero-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
  margin-bottom: 50px;
}

.hero-content {
  flex: 1 1 620px;
  max-width: 680px;
  text-align: left;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  border-radius: 2px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.35);
  font-size: 0.85rem;
  font-weight: 600;
  color: #34d399;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.15);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-green);
}

.hero-title {
  font-size: clamp(2.3rem, 3.8vw, 3.4rem);
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 24px;
  letter-spacing: -0.8px;
  text-align: left;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 10%, #00f0ff 65%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 25px rgba(0, 240, 255, 0.4));
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 0 34px 0;
  line-height: 1.75;
  text-align: left;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 0;
}

/* ===================================================================
   主视觉区右侧专属独立展示位：巨幅机械齿轮 + 激光准星动态组
   =================================================================== */
.hero-visual {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.mech-anim-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 24px 28px;
  background: rgba(10, 16, 28, 0.94);
  border: 1.5px solid rgba(0, 240, 255, 0.5);
  border-radius: var(--radius-lg);
  box-shadow: 0 0 45px rgba(0, 240, 255, 0.28), inset 0 0 25px rgba(0, 240, 255, 0.12);
}

/* 齿轮核心容器：大号尺寸 170px × 170px，气势磅礴 */
.mech-cog-wrapper {
  position: relative;
  width: 170px;
  height: 170px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 机械外轮廓瞄准环（反向匀速雷达旋转） */
.mech-reticle {
  position: absolute;
  top: -15px;
  left: -15px;
  width: 200px;
  height: 200px;
  animation: mechReticleSpin 20s linear infinite;
  pointer-events: none;
}

@keyframes mechReticleSpin {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 主机械齿轮（顺时针强劲转动） */
.mech-gear-main {
  width: 134px;
  height: 134px;
  animation: mechGearClockwise 10s linear infinite;
  filter: drop-shadow(0 0 12px rgba(0, 240, 255, 0.65));
}

@keyframes mechGearClockwise {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 咬合副齿轮（反向啮合） */
.mech-gear-sub {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 72px;
  height: 72px;
  animation: mechGearCounter 6s linear infinite reverse;
  filter: drop-shadow(0 0 12px rgba(245, 158, 11, 0.75));
}

@keyframes mechGearCounter {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 反应堆核心能量脉冲动效 */
.mech-core-pulse {
  animation: mechCorePulse 1.8s ease-in-out infinite alternate;
}

@keyframes mechCorePulse {
  0% {
    r: 5px;
    opacity: 0.6;
    filter: drop-shadow(0 0 4px #00f0ff);
  }
  100% {
    r: 9px;
    opacity: 1;
    filter: drop-shadow(0 0 16px #00f0ff);
  }
}

/* 机械状态文字徽标 */
.mech-badge-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  margin-top: 14px;
  text-transform: uppercase;
}

.mech-status-blink {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: mechBlink 1.2s infinite ease-in-out;
}

@keyframes mechBlink {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.hero-trust {
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
  max-width: 100%;
  margin: 0;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.trust-icon {
  width: 20px;
  height: 20px;
  color: var(--accent-cyan);
  filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.4));
}

/* ===================================================================
   核心优势卡片（3个图文卡片 · 机械装甲面板风）
   =================================================================== */
.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-md);
  padding: 36px 30px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.feature-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 12px;
  height: 12px;
  border-top: 2px solid var(--accent-cyan);
  border-right: 2px solid var(--accent-cyan);
}

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

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--accent-cyan);
  box-shadow: inset 0 0 15px rgba(0, 240, 255, 0.15);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.feature-pill {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 2px;
  background: rgba(0, 240, 255, 0.06);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.18);
}

/* ===================================================================
   流媒体与 AI 支持图卡
   =================================================================== */
.support-wrapper {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.support-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.support-box::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 24px;
  height: 2px;
  background: var(--accent-cyan);
}

.support-box-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.support-box-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.support-icon-media {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.35);
  box-shadow: 0 0 15px rgba(239, 68, 68, 0.2);
}

.support-icon-ai {
  background: rgba(0, 240, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.35);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
}

.support-box-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
}

.support-box-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
  line-height: 1.7;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
}

.support-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(16, 24, 40, 0.8);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.support-item:hover {
  background: rgba(24, 36, 60, 0.95);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.2);
}

.support-item-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ===================================================================
   套餐价格对比表（机械机甲装甲箱造型）
   =================================================================== */
.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-md);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.pricing-card.popular {
  background: rgba(14, 24, 44, 0.92);
  border-color: rgba(0, 240, 255, 0.65);
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.25), inset 0 0 20px rgba(0, 240, 255, 0.08);
  transform: scale(1.03);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00d2df 0%, #2563eb 100%);
  color: #030712;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 4px 18px;
  border-radius: 2px;
  letter-spacing: 0.8px;
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.pricing-plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: #ffffff;
}

.pricing-plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 20px 0;
}

.pricing-currency {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.pricing-price {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 600;
}

.pricing-features {
  list-style: none;
  margin: 20px 0 32px 0;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  margin-bottom: 14px;
  color: var(--text-muted);
}

.pricing-check {
  color: var(--accent-cyan);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 4px var(--accent-cyan));
}

.pricing-card .btn {
  width: 100%;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 240, 255, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
}

.review-stars {
  color: var(--accent-amber);
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

.review-text {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 20px;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(0, 240, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.review-user-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
}

.review-user-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ===================================================================
   常见问题 FAQ（机械装甲折叠箱）
   =================================================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--border-highlight);
  background: rgba(14, 22, 38, 0.85);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
}

.faq-summary {
  list-style: none;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  color: #ffffff;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--accent-cyan);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--accent-amber);
}

.faq-content {
  padding: 0 24px 22px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  border-top: 1px dashed rgba(0, 240, 255, 0.15);
  margin-top: 4px;
  padding-top: 16px;
}

/* 行动唤起 Banner（能量反应堆核心风格） */
.cta-banner {
  background: linear-gradient(135deg, rgba(14, 26, 46, 0.9) 0%, rgba(20, 36, 64, 0.9) 100%);
  border: 1px solid rgba(0, 240, 255, 0.45);
  border-radius: var(--radius-md);
  padding: 56px 40px;
  text-align: center;
  margin: 60px auto 0 auto;
  max-width: var(--max-width);
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.2), inset 0 0 30px rgba(0, 240, 255, 0.05);
  position: relative;
}

.cta-banner::before {
  content: 'SYSTEM ACTIVE';
  position: absolute;
  top: 12px;
  right: 20px;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  opacity: 0.7;
}

.cta-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 14px;
  color: #ffffff;
}

.cta-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px auto;
}

/* 页脚 Footer */
.footer {
  margin-top: auto;
  background-color: #04060c;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px 0;
  position: relative;
  z-index: 1;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: 2px;
  background: rgba(14, 20, 34, 0.8);
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
  letter-spacing: 0.5px;
}

.footer-link:hover {
  color: var(--accent-cyan);
  background: rgba(20, 32, 54, 0.95);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
}

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(0, 240, 255, 0.08);
  padding-top: 24px;
}

/* ===================================================================
   知识科普与 SEO 专栏页面样式
   =================================================================== */
.subpage-header {
  padding: 70px 0 40px 0;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(0, 240, 255, 0.15), transparent 70%);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  z-index: 1;
}

.subpage-title {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: #ffffff;
}

.subpage-meta {
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 600;
}

.subpage-content {
  padding: 60px 0 90px 0;
  max-width: 880px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.prose {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 44px 40px;
  box-shadow: var(--shadow-sm);
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin: 32px 0 14px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.prose h2::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--accent-cyan);
  border-radius: 1px;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
  font-size: 1rem;
}

.prose ul, .prose ol {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  padding-left: 24px;
}

.prose li {
  margin-bottom: 8px;
}

.prose strong {
  color: #ffffff;
}

.highlight-box {
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid rgba(0, 240, 255, 0.3);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 24px 0;
  box-shadow: inset 0 0 15px rgba(0, 240, 255, 0.05);
}

.highlight-box-warning {
  background: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.35);
}

.highlight-box-success {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.35);
}

.toc-box {
  background: rgba(12, 19, 32, 0.85);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-cyan);
}

.toc-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  list-style: none;
  padding-left: 0 !important;
}

.toc-item a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.92rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(16, 24, 40, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.1);
  transition: all 0.2s ease;
}

.toc-item a:hover {
  color: #ffffff;
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--accent-cyan);
  transform: translateX(4px);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

.seo-article {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 38px 36px;
  margin-bottom: 48px;
  scroll-margin-top: 90px;
  transition: border-color 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.seo-article:hover {
  border-color: rgba(0, 240, 255, 0.4);
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.12);
}

.article-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.article-header h2 {
  font-size: 1.65rem;
  font-weight: 800;
  line-height: 1.35;
  margin: 10px 0;
  color: #ffffff;
}

.article-header h2::before {
  display: none !important;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.article-tag {
  background: rgba(0, 240, 255, 0.12);
  color: var(--accent-cyan);
  padding: 2px 10px;
  border-radius: 2px;
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.internal-link {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 700;
  transition: color 0.2s ease;
}

.internal-link:hover {
  color: #ffffff;
  text-shadow: 0 0 8px var(--accent-cyan);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(14, 24, 42, 0.9) 0%, rgba(20, 34, 60, 0.9) 100%);
  border: 1px dashed rgba(0, 240, 255, 0.45);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  background: rgba(14, 22, 38, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  color: var(--accent-cyan);
  font-weight: 800;
}

.sitemap-card ul {
  list-style: none;
  padding-left: 0;
}

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

.sitemap-card a {
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-card a:hover {
  color: #ffffff;
  text-decoration: underline;
}

/* ===================================================================
   响应式适配：媒体查询 (@media)
   =================================================================== */

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

  .pricing-card.popular {
    transform: none;
  }
}

@media (max-width: 960px) {
  .hero-layout {
    flex-direction: column;
    align-items: flex-start;
    gap: 36px;
  }
  .hero-content {
    max-width: 100%;
  }
  .hero-visual {
    align-self: center;
  }
}

@media (max-width: 768px) {
  .header {
    height: 64px;
  }

  .nav {
    display: none;
  }

  .section {
    padding: 56px 0;
  }

  .hero {
    padding: 50px 0 36px 0;
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 28px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 36px auto;
  }

  .hero-actions .btn {
    width: 100%;
    height: 50px;
    font-size: 1.05rem;
  }

  .hero-trust {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .features-grid,
  .support-wrapper,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid,
  .toc-list {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .pricing-card {
    padding: 30px 22px;
  }

  .pricing-price {
    font-size: 2.5rem;
  }

  .cta-banner {
    padding: 40px 20px;
    margin-top: 40px;
  }

  .cta-title {
    font-size: 1.7rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 14px;
    width: 100%;
  }

  .footer-link {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }

  .prose, .seo-article {
    padding: 26px 18px;
  }

  .article-header h2 {
    font-size: 1.35rem;
  }

  .article-cta-box {
    flex-direction: column;
    text-align: center;
  }

  .article-cta-box .btn {
    width: 100%;
  }

  .mech-anim-container {
    transform: scale(0.9);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

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

  .btn {
    min-height: 48px;
  }
}

/* ===================================================================
   无障碍与键盘访问增强 (Accessibility & Focus)
   =================================================================== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--primary);
  color: #060911;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  z-index: 999999;
  text-decoration: none;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
}

@media (max-width: 768px) {
  .btn,
  .footer-link,
  summary {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
}

@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;
  }
  .mech-particles-layer {
    display: none !important;
  }
}