/* ===== 基础变量与重置 ===== */
:root {
  --bg: #0b1020;
  --bg-soft: #101731;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.09);
  --text: #e6eaf5;
  --text-dim: #9aa4c0;
  --accent: #4d8dff;
  --accent-2: #8b5cf6;
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 星空背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 70% 12%, rgba(255,255,255,.4) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 40% 70%, rgba(255,255,255,.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 85% 55%, rgba(255,255,255,.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 10% 80%, rgba(255,255,255,.3) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 55% 25%, rgba(255,255,255,.3) 50%, transparent 51%),
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(77, 141, 255, 0.16), transparent),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(139, 92, 246, 0.12), transparent);
  background-size: 480px 480px, 420px 420px, 560px 560px, 500px 500px, 460px 460px, 520px 520px, 100% 100%, 100% 100%;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 16, 32, 0.75);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}
.brand:hover { text-decoration: none; }

.site-header .btn { margin-left: auto; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .15s, box-shadow .15s, background .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 18px rgba(77, 141, 255, 0.35);
}
.btn-primary:hover { background: #3d7df0; }

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: var(--card);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); }

.btn-lg { padding: 13px 32px; font-size: 16px; }

/* ===== 首屏 ===== */
.hero { padding: 96px 0 72px; text-align: center; }

.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(120deg, #fff 20%, var(--accent) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero h1 .en { font-size: 0.5em; letter-spacing: 4px; vertical-align: middle; opacity: .8; }

.slogan { margin-top: 18px; font-size: clamp(16px, 2.6vw, 21px); color: var(--text); }
.sub { margin-top: 10px; font-size: 14px; color: var(--text-dim); }

.hero-badges { margin-top: 22px; display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
.badge {
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--accent);
  border: 1px solid rgba(77, 141, 255, 0.4);
  background: rgba(77, 141, 255, 0.08);
}

.hero-cta { margin-top: 34px; display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }
.hero-note { margin-top: 18px; font-size: 12px; color: var(--text-dim); }

/* ===== 通用区块 ===== */
.section { padding: 64px 0; }
.section h2 {
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 1px;
}
.section-desc { text-align: center; color: var(--text-dim); font-size: 14px; margin: 8px 0 36px; }

.grid { display: grid; gap: 18px; }

/* 功能卡片 */
.features { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(77, 141, 255, 0.45);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.card-icon { font-size: 30px; margin-bottom: 12px; }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { font-size: 13.5px; color: var(--text-dim); }

/* 截图 */
.shots { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.shot {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
  cursor: zoom-in;
  transition: transform .2s, box-shadow .2s;
}
.shot:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45); }
.shot img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top; }
.shot figcaption { padding: 10px 14px; font-size: 13px; color: var(--text-dim); text-align: center; }

/* 下载步骤 */
.steps {
  max-width: 640px;
  margin: 0 auto 32px;
  padding-left: 22px;
  color: var(--text-dim);
  font-size: 14.5px;
}
.steps li { margin-bottom: 10px; }
.steps strong { color: var(--text); }

.download-box { text-align: center; }
.download-box .btn { margin: 0 8px 12px; }
.download-tip { font-size: 12.5px; color: var(--text-dim); }

/* ===== 页尾 ===== */
.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  background: rgba(8, 12, 24, 0.8);
  padding: 44px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.footer-col h4 {
  font-size: 14px;
  margin-bottom: 14px;
  color: var(--text);
  letter-spacing: 1px;
}

.product-list, .link-list { list-style: none; }
.product-list li { margin-bottom: 12px; font-size: 13px; }
.product-list li span { display: block; color: var(--text-dim); font-size: 12px; }
.link-list li { margin-bottom: 8px; font-size: 13px; }

.footer-text { font-size: 12.5px; color: var(--text-dim); }

.footer-bottom {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text-dim);
}
.footer-bottom a { color: var(--text-dim); }
.footer-bottom a:hover { color: var(--text); }

/* ===== 灯箱 ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(5, 8, 16, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
.lightbox[hidden] { display: none; }
.lightbox img { max-width: 92vw; max-height: 88vh; border-radius: 10px; box-shadow: 0 20px 60px rgba(0,0,0,.6); }
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.18); }

/* ===== 响应式 ===== */
@media (max-width: 720px) {
  .nav-wrap { gap: 12px; }
  .hero { padding: 64px 0 48px; }
  .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
}