/* 启小裕 Q7 产品详情页 · 独立静态站
   改样式就改这一个文件，颜色变量在 :root 里 */
:root {
  --bg: #0b0e14;
  --bg-soft: #10141f;
  --card: #141a29;
  --line: rgba(255, 255, 255, 0.08);
  --text: #e8ecf3;
  --text-dim: #9aa4b8;
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.4);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}
img { display: block; width: 100%; height: auto; border-radius: 12px; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-weight: 700; font-size: 17px; letter-spacing: 1px; }
.nav-logo span { color: var(--cyan); }
.nav a.back {
  font-size: 14px; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 18px; transition: all .25s;
}
.nav a.back:hover { color: var(--cyan); border-color: var(--cyan-dim); }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; }
.hero-img { position: relative; }
.hero-img img { border-radius: 0; aspect-ratio: 16/9; object-fit: cover; }
.hero-img::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(11,14,20,0) 40%, var(--bg) 96%);
}
.hero-text { position: absolute; left: 0; right: 0; bottom: 8%; z-index: 2; }
.hero-kicker {
  color: var(--cyan); font-size: 13px; letter-spacing: 4px;
  text-transform: uppercase; margin-bottom: 10px;
}
.hero h1 { font-size: clamp(28px, 5vw, 46px); font-weight: 800; letter-spacing: 2px; }
.hero p.sub { color: var(--text-dim); margin-top: 10px; font-size: 15px; }

/* ===== 通用区块 ===== */
.section { padding: 90px 0; }
.section.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.kicker {
  color: var(--cyan); font-size: 12px; letter-spacing: 4px;
  text-transform: uppercase; margin-bottom: 12px;
}
h2.title { font-size: clamp(24px, 4vw, 34px); font-weight: 800; letter-spacing: 1px; }
.center { text-align: center; }
.center .sub { color: var(--text-dim); margin-top: 12px; font-size: 15px; }
.mb48 { margin-bottom: 48px; }

/* ===== 步骤（介绍在上，图片在下） ===== */
.step2 { margin-bottom: 88px; }
.step2:last-child { margin-bottom: 0; }
.step2-text { max-width: 720px; margin-bottom: 32px; }
.step-num {
  color: var(--cyan); font-size: 13px; letter-spacing: 3px;
  text-transform: uppercase; margin-bottom: 10px;
}
.step2-text h3 { font-size: 26px; font-weight: 700; margin-bottom: 12px; }
.step2-text p { color: var(--text-dim); font-size: 15px; }
.step2-media img { width: 100%; }
.step2-media.portrait { max-width: 420px; }
.step2-media.wide { max-width: 960px; }
.dots { list-style: none; margin-top: 16px; }
.dots li { padding: 6px 0 6px 24px; position: relative; color: var(--text-dim); font-size: 15px; }
.dots li::before {
  content: ""; position: absolute; left: 0; top: 16px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan-dim);
}

/* ===== 双皮肤 ===== */
.skins { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.skin-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.skin-card img { border-radius: 0; }
.skin-card .label {
  padding: 14px 18px; font-size: 14px; color: var(--text-dim);
  border-top: 1px solid var(--line);
}
.skin-card .label b { color: var(--text); font-weight: 600; margin-right: 8px; }

/* ===== 组网 ===== */
.mesh { display: grid; grid-template-columns: 380px 1fr; gap: 56px; align-items: center; }
.mesh ul { list-style: none; margin-top: 20px; }
.mesh li { padding: 8px 0 8px 24px; position: relative; color: var(--text-dim); font-size: 15px; }
.mesh li::before {
  content: ""; position: absolute; left: 0; top: 18px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan-dim);
}
.mesh p { color: var(--text-dim); font-size: 15px; margin-top: 10px; }

/* ===== 场景 ===== */
.scenes-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-bottom: 28px; }
.scene-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.scene-card img { border-radius: 0; }
.scene-card .label { padding: 12px 18px; font-size: 13px; color: var(--text-dim); border-top: 1px solid var(--line); }
.scene-wide { max-width: 880px; margin: 0 auto; }

/* ===== CTA ===== */
.cta {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 56px 32px;
  text-align: center;
}
.cta h2 { font-size: clamp(22px, 4vw, 30px); font-weight: 800; }
.cta p { color: var(--text-dim); margin: 12px 0 28px; font-size: 15px; }
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 999px;
  font-size: 15px; font-weight: 600; transition: all .25s;
}
.btn-primary { background: var(--cyan); color: #06232a; }
.btn-primary:hover { box-shadow: 0 0 24px var(--cyan-dim); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--cyan-dim); color: var(--cyan); }

/* ===== 页脚（唯一信息条） ===== */
.footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 24px 0 32px; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 6px 20px;
  align-items: center; justify-content: space-between;
  color: var(--text-dim); font-size: 13px;
}
.footer a:hover { color: var(--cyan); }
.footer .beian { display: inline-flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.footer .gongan { display: inline-flex; align-items: center; gap: 5px; }
.footer .gongan img { width: 14px; height: 14px; border-radius: 0; }

/* ===== 手机端 ===== */
@media (max-width: 860px) {
  .skins, .scenes-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .step2 { margin-bottom: 56px; }
  .step2-media.portrait { max-width: 100%; }
  .cta { padding: 40px 20px; }
  .cta-btns { flex-direction: column; gap: 12px; }
  .cta-btns .btn { width: 100%; justify-content: center; }
  .footer { margin-top: 16px; padding: 20px 0 28px; }
  .footer-inner { flex-direction: column; justify-content: center; text-align: center; gap: 8px; }
  .footer .beian { justify-content: center; flex-direction: column; gap: 6px; }
}