/* 基础变量与主题色（tiktok风 + 暖色渐变） */
:root {
  --black: #0f0f12;
  --white: #ffffff;
  --tiktok-pink: #fe2c55;
  --tiktok-blue: #25f4ee;
  --warm-orange: #ff8a00;
  --warm-red: #ff5a5f;
  --bg-start: #0f0f12;
  --bg-end: #1a0f1b;
  --text-strong: #fefefe;
  --text-muted: #d6d6d6;
  --card-bg: #15151a;
  --card-stroke: rgba(255,255,255,.08);
  --grad-hero: linear-gradient(135deg, rgba(254,44,85,0.25), rgba(255,138,0,0.25) 40%, rgba(37,244,238,0.20));
  --grad-pulse: linear-gradient(135deg, #fe2c55, #ff8a00 45%, #25f4ee);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans SC', system-ui, -apple-system, Segoe UI, Roboto, Arial, "PingFang SC", "Microsoft Yahei", sans-serif;
  color: var(--text-muted);
  background: radial-gradient(800px 400px at 10% 0%, rgba(254,44,85,.12), transparent 60%),
              radial-gradient(800px 400px at 90% 5%, rgba(37,244,238,.12), transparent 60%),
              linear-gradient(180deg, var(--bg-start), var(--bg-end));
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.2) blur(8px);
  background: rgba(15,15,18,.55);
  border-bottom: 1px solid var(--card-stroke);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--text-strong);
  letter-spacing: .5px;
}
.nav-toggle { display: inline-block; background: transparent; border: 0; color: var(--text-strong); font-size: 22px; }

/* 粒子容器覆盖 */
#tsparticles {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* 首屏区域 */
.hero {
  position: relative;
  z-index: 2;
  padding: 92px 0 80px;
  background-image: var(--grad-hero);
  background-size: 200% 200%;
  animation: bgShift 16s ease-in-out infinite;
}
.hero-content {
  text-align: center;
}
.hero-title {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 38px;
  line-height: 1.2;
  color: var(--text-strong);
  margin: 0 0 14px;
}
.hero-subtitle {
  font-size: 16px;
  max-width: 760px;
  margin: 0 auto 24px;
  color: #e9e9e9;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; }

.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: transform .15s ease, box-shadow .15s ease, background .2s ease;
}
.btn.primary {
  color: var(--black);
  background-image: var(--grad-pulse);
  box-shadow: 0 8px 24px rgba(254,44,85,.25);
}
.btn.primary:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(254,44,85,.35); }
.btn.ghost { color: var(--text-strong); border: 1px solid var(--card-stroke); background: rgba(255,255,255,.06);} 
.btn.ghost:hover { background: rgba(255,255,255,.12); }

/* 标准区块 */
.section { position: relative; z-index: 2; padding: 68px 0; }
.section-title {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 28px;
  color: var(--text-strong);
  margin: 0 0 24px;
}

/* 业务卡片栅格 */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border: 1px solid var(--card-stroke);
  border-radius: 16px;
  padding: 20px;
  color: var(--text-muted);
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card::before {
  content: "";
  position: absolute; inset: -1px; border-radius: 16px;
  padding: 1px; background: var(--grad-pulse);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: .15;
  pointer-events: none;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(255,90,95,.18); border-color: rgba(255,255,255,.18); }
.card:focus { outline: 2px solid rgba(255,255,255,.18); }
.card-icon { color: var(--tiktok-pink); margin-bottom: 10px; }
.card-title {
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 18px;
  margin: 4px 0 8px;
  color: var(--text-strong);
}
.card-text { line-height: 1.7; font-size: 14px; color: #e3e3e3; }
/* 卡片“了解更多”链接样式，确保可见且可点击 */
.card-link {
  position: relative;
  z-index: 2;
  display: inline-block;
  margin-top: 10px;
  color: var(--text-strong);
  font-weight: 600;
  text-decoration: none;
}
.card-link:hover { text-decoration: underline; }

/* 联系我们区块 */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 20px;
}
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; background: rgba(255,255,255,.04); border: 1px solid var(--card-stroke); border-radius: 16px; padding: 16px; }
.form label { display: flex; flex-direction: column; gap: 8px; }
.form label.full { grid-column: 1 / -1; }
.form span { color: var(--text-strong); font-weight: 600; font-size: 13px; }
.form input, .form textarea {
  width: 100%; border-radius: 12px; border: 1px solid rgba(255,255,255,.14);
  padding: 10px 12px; color: var(--text-strong);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.04));
}
.form input::placeholder, .form textarea::placeholder { color: #9aa0a6; }
.form .submit { grid-column: 1 / -1; margin-top: 2px; }
.form-tip { grid-column: 1 / -1; margin: 8px 0 0; font-size: 12px; color: #c8c8c8; }

.company { background: rgba(255,255,255,.04); border: 1px solid var(--card-stroke); border-radius: 16px; padding: 16px; }
.company-title { font-family: 'Poppins', sans-serif; font-weight: 700; color: var(--text-strong); margin: 0 0 8px; }
.company-info { list-style: none; padding: 0; margin: 0; }
.company-info li { margin: 8px 0; color: #e9e9e9; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--card-stroke); padding: 24px 0; background: rgba(15,15,18,.65); }
.footer-inner { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; }
.footer-brand { font-family: 'Poppins', sans-serif; font-weight: 700; color: var(--text-strong); }
.footer-icp, .footer-copy { text-align: center; }

/* 覆盖式菜单 */
.menu-overlay { position: fixed; inset: 0; z-index: 100; display: none; background: rgba(0,0,0,.5); backdrop-filter: blur(6px); }
.menu-overlay.open { display: block; }
.menu { position: absolute; right: 20px; top: 72px; background: rgba(20,20,22,.9); border: 1px solid var(--card-stroke); border-radius: 14px; padding: 12px; display: flex; flex-direction: column; gap: 6px; min-width: 220px; }
.menu a { color: var(--text-strong); text-decoration: none; padding: 10px 12px; border-radius: 10px; }
.menu a:hover { background: rgba(255,255,255,.08); }

/* 动画与响应式 */
@keyframes bgShift { 0%{ background-position:0% 0%; } 50%{ background-position:100% 100%; } 100%{ background-position:0% 0%; } }

@media (max-width: 992px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; background: transparent; border: 0; color: var(--text-strong); font-size: 20px; }
  .hero-title { font-size: 28px; }
  .hero-subtitle { font-size: 14px; }
  .cards { grid-template-columns: 1fr; }
  .form { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 8px; text-align: center; }
}