/* ============ 全局初始化 (Apple Style Reset) ============ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; background: #141414; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'PingFang SC', sans-serif;
  background: #141414;
  color: #ffffff;
  overflow-x: hidden;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ============ 现代科技感：环境光晕 & 网格 ============ */
.ambient-glow {
  position: fixed; top: 25%; left: 50%; transform: translate(-50%, -50%);
  width: 60vw; height: 60vw; max-width: 800px;
  background: radial-gradient(circle, rgba(255,255,255,0.04) 0%, rgba(255,255,255,0.01) 40%, transparent 70%);
  filter: blur(60px); pointer-events: none; z-index: 1;
  animation: pulseGlow 10s ease-in-out infinite alternate;
}
@keyframes pulseGlow {
  0% { opacity: 0.7; transform: translate(-50%, -50%) scale(0.95); }
  100% { opacity: 1; transform: translate(-50%, -50%) scale(1.05); }
}

.grid-bg {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 1; pointer-events: none; opacity: 0.15;
  background-size: 60px 60px;
  background-image: linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
  mask-image: radial-gradient(circle at 50% 35%, #000 20%, transparent 65%);
  -webkit-mask-image: radial-gradient(circle at 50% 35%, #000 20%, transparent 65%);
}

#particles { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }

/* ============ 导航栏 (悬浮磨砂) ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: 52px; z-index: 100;
  background: rgba(20, 20, 20, 0.7);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto; height: 100%; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: #fff; font-size: 0.9rem; font-weight: 500; letter-spacing: -0.01em;
}
.nav-logo svg { width: 20px; height: 20px; stroke: #fff; fill: none; stroke-width: 2.5; }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  text-decoration: none; color: rgba(255,255,255,0.5); font-size: 0.8rem;
  transition: color 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
}
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-cta {
  padding: 7px 18px; border-radius: 100px; border: 1px solid rgba(255,255,255,0.15);
  color: #fff; font-size: 0.78rem; text-decoration: none; transition: all 0.25s;
}
.nav-cta:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.35); }

/* ============ 主体内容区 ============ */
.main {
  position: relative; z-index: 10; display: flex; flex-direction: column; align-items: center;
  padding: 140px 24px 80px; text-align: center; max-width: 1200px; margin: 0 auto;
}

/* ============ Google风格 极简徽章 ============ */
.badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.72rem; font-weight: 500; letter-spacing: 0.15em; color: rgba(255, 255, 255, 0.7);
  margin-bottom: 32px;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: #fff;
  box-shadow: 0 0 8px #fff; animation: dotPulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
@keyframes dotPulse { 0%, 100% { opacity: 1; } 50% { opacity: .3; } }

/* ============ 苹果标志性大标题 (渐变 & 厚重) ============ */
.title-block { margin-bottom: 24px; max-width: 900px; }
.title-line {
  font-size: clamp(2.2rem, 6vw, 5rem); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.1;
  background: linear-gradient(180deg, #ffffff 30%, rgba(255, 255, 255, 0.4) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.section-title {
  font-size: clamp(1.6rem, 4vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em;
  line-height: 1.15; margin-bottom: 16px;
  background: linear-gradient(180deg, #ffffff 40%, rgba(255, 255, 255, 0.55) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.section-sub {
  font-size: clamp(0.95rem, 2vw, 1.1rem); color: rgba(255,255,255,0.45);
  max-width: 640px; margin: 0 auto 56px; line-height: 1.6;
}

/* ============ 副标题 ============ */
.subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem); color: rgba(255, 255, 255, 0.45);
  max-width: 640px; margin: 0 auto 48px; line-height: 1.6; font-weight: 400; letter-spacing: -0.01em;
}

/* ============ 艺术感声声波 (Glow Visualizer) ============ */
.visualizer {
  display: flex; align-items: center; justify-content: center;
  gap: 5px; height: 64px; margin-bottom: 80px; width: 100%;
}
.visualizer .bar {
  width: 3px; height: 4px; border-radius: 10px;
  background: linear-gradient(to top, rgba(255,255,255,0.15), rgba(255,255,255,0.9));
  box-shadow: 0 0 10px rgba(255,255,255,0.05);
  will-change: height;
}

/* ============ Bento Grid 模块化产品卡片 ============ */
.features {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  max-width: 1000px; width: 100%; margin-bottom: 80px;
}
.feature-card {
  position: relative; padding: 40px 32px; border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.05); background: rgba(10, 10, 10, 0.4);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1); text-align: left;
}
.feature-card:hover {
  background: rgba(15, 15, 15, 0.6); border-color: rgba(255,255,255,0.15);
  transform: translateY(-4px); box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}
.feature-icon {
  width: 40px; height: 40px; margin-bottom: 24px; color: rgba(255,255,255,0.8);
}
.feature-icon svg { width: 100%; height: 100%; stroke: currentColor; fill: none; stroke-width: 1.5; }
.feature-card h3 { font-size: 1.15rem; font-weight: 500; margin-bottom: 12px; color: #fff; letter-spacing: -0.01em; }
.feature-card p { font-size: 0.88rem; color: rgba(255,255,255,0.4); line-height: 1.6; }

/* ============ 通用区块 ============ */
.section { width: 100%; max-width: 1000px; margin-bottom: 100px; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .eyebrow {
  font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: rgba(255,255,255,0.4); margin-bottom: 14px;
}

/* ============ 按钮 ============ */
.btn-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 80px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px; border-radius: 100px; font-size: 0.88rem; font-weight: 500;
  text-decoration: none; transition: all 0.25s cubic-bezier(0.16,1,0.3,1); cursor: pointer; border: none;
}
.btn-primary { background: #fff; color: #000; }
.btn-primary:hover { background: rgba(255,255,255,0.88); transform: scale(1.03); }
.btn-ghost { background: rgba(255,255,255,0.04); color: #fff; border: 1px solid rgba(255,255,255,0.12); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.3); }

/* ============ 产品展示 ============ */
.product-showcase {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center;
  width: 100%; max-width: 1000px; margin-bottom: 100px;
}
.product-shot {
  border-radius: 24px; overflow: hidden; border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02); aspect-ratio: 4/3;
}
.product-shot img { width: 100%; height: 100%; object-fit: cover; display: block; }
.product-copy { text-align: left; }
.product-copy h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 16px; letter-spacing: -0.02em; }
.product-copy p { color: rgba(255,255,255,0.5); line-height: 1.7; font-size: 0.95rem; margin-bottom: 20px; }
.product-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.product-tags span {
  font-size: 0.75rem; padding: 6px 14px; border-radius: 100px;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08); color: rgba(255,255,255,0.7);
}

/* ============ 规格参数表 ============ */
.spec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.06); border-radius: 20px; overflow: hidden; }
.spec-item { background: #141414; padding: 28px 32px; text-align: left; }
.spec-item .k { font-size: 0.75rem; color: rgba(255,255,255,0.4); letter-spacing: 0.05em; margin-bottom: 8px; }
.spec-item .v { font-size: 1.05rem; color: #fff; font-weight: 500; }
.spec-item .v small { display: block; font-size: 0.8rem; color: rgba(255,255,255,0.4); font-weight: 400; margin-top: 4px; }

/* ============ 场景卡片 ============ */
.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; width: 100%; max-width: 1000px; }
.scene-card { padding: 32px 28px; border-radius: 20px; border: 1px solid rgba(255,255,255,0.06); background: rgba(10,10,10,0.4); text-align: left; transition: all 0.35s; }
.scene-card:hover { border-color: rgba(255,255,255,0.18); transform: translateY(-3px); }
.scene-card .num { font-size: 0.8rem; color: rgba(255,255,255,0.3); margin-bottom: 14px; }
.scene-card h4 { font-size: 1.05rem; font-weight: 500; margin-bottom: 10px; }
.scene-card p { font-size: 0.85rem; color: rgba(255,255,255,0.42); line-height: 1.6; }

/* ============ 数据指标 ============ */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; width: 100%; max-width: 1000px; margin-bottom: 100px; }
.metric { text-align: center; padding: 32px 16px; border-radius: 20px; border: 1px solid rgba(255,255,255,0.06); background: rgba(10,10,10,0.35); }
.metric .num { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 700; letter-spacing: -0.02em; background: linear-gradient(180deg,#fff,rgba(255,255,255,0.5)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.metric .label { font-size: 0.8rem; color: rgba(255,255,255,0.45); margin-top: 8px; }

/* ============ 时间线 / 流程 ============ */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; width: 100%; max-width: 1000px; }
.step { text-align: left; padding: 28px 24px; border-radius: 18px; border: 1px solid rgba(255,255,255,0.06); background: rgba(10,10,10,0.35); }
.step .idx { font-size: 0.8rem; color: rgba(255,255,255,0.3); margin-bottom: 12px; }
.step h4 { font-size: 1rem; font-weight: 500; margin-bottom: 8px; }
.step p { font-size: 0.82rem; color: rgba(255,255,255,0.42); line-height: 1.6; }

/* ============ FAQ ============ */
.faq { width: 100%; max-width: 760px; text-align: left; margin-bottom: 100px; }
.faq-item { border-bottom: 1px solid rgba(255,255,255,0.07); padding: 24px 4px; }
.faq-item summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-size: 1rem; font-weight: 500; color: #fff; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .plus { color: rgba(255,255,255,0.4); font-size: 1.4rem; transition: transform 0.3s; }
.faq-item[open] summary .plus { transform: rotate(45deg); }
.faq-item p { font-size: 0.9rem; color: rgba(255,255,255,0.45); line-height: 1.7; margin-top: 14px; }

/* ============ 联系 / 地址卡片 ============ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; width: 100%; max-width: 900px; margin-bottom: 100px; }
.contact-card { padding: 36px 32px; border-radius: 22px; border: 1px solid rgba(255,255,255,0.07); background: rgba(10,10,10,0.4); text-align: left; }
.contact-card .k { font-size: 0.75rem; color: rgba(255,255,255,0.4); letter-spacing: 0.08em; margin-bottom: 12px; }
.contact-card .v { font-size: 1.05rem; color: #fff; line-height: 1.6; }
.contact-card .v a { color: #fff; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.2); }

/* ============ CTA 收尾 ============ */
.cta-final {
  width: 100%; max-width: 900px; padding: 64px 40px; border-radius: 28px;
  border: 1px solid rgba(255,255,255,0.08); background: rgba(255,255,255,0.02);
  margin-bottom: 80px;
}
.cta-final h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px; background: linear-gradient(180deg,#fff,rgba(255,255,255,0.5)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.cta-final p { color: rgba(255,255,255,0.45); margin-bottom: 32px; }

/* ============ 页脚 ============ */
.footer { width: 100%; max-width: 1000px; padding-top: 48px; border-top: 1px solid rgba(255, 255, 255, 0.05); }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; flex-wrap: wrap; text-align: left; }
.footer-brand { max-width: 280px; }
.footer-brand .logo { display: flex; align-items: center; gap: 8px; font-size: 0.95rem; font-weight: 500; margin-bottom: 14px; }
.footer-brand .logo svg { width: 18px; height: 18px; stroke: #fff; fill: none; stroke-width: 2.5; }
.footer-brand p { font-size: 0.8rem; color: rgba(255,255,255,0.4); line-height: 1.6; }
.footer-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-col h5 { font-size: 0.75rem; color: rgba(255,255,255,0.5); letter-spacing: 0.05em; margin-bottom: 16px; }
.footer-col a { display: block; color: rgba(255,255,255,0.35); text-decoration: none; transition: color 0.2s; font-size: 0.82rem; margin-bottom: 10px; }
.footer-col a:hover { color: rgba(255,255,255,0.8); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.05); }
.footer-copy { font-size: 0.75rem; color: rgba(255,255,255,0.2); }
.footer-icp { font-size: 0.75rem; color: rgba(255,255,255,0.25); }
.footer-icp a { color: rgba(255,255,255,0.25); text-decoration: none; transition: color 0.2s; }
.footer-icp a:hover { color: rgba(255,255,255,0.6); }

/* ============ 响应式断点优化 ============ */
@media (max-width: 880px) {
  .features, .scene-grid, .metrics, .steps { grid-template-columns: 1fr; gap: 16px; }
  .product-showcase, .spec-grid, .contact-grid { grid-template-columns: 1fr; }
  .feature-card, .scene-card, .metric, .step, .contact-card { padding: 28px 24px; }
  .nav-links { display: none; }
  .footer-inner { flex-direction: column; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}