/* 全能互动软件 - 官网样式 */
:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #334155;
  --primary: #38bdf8;
  --primary-dim: #0ea5e9;
  --accent: #fbbf24;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --radius: 12px;
  --radius-sm: 8px;
  --font: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; font-size: 15px; }

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0.75rem 1.5rem;
}
.nav-inner { max-width: 1000px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; }
.nav-logo { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.nav-logo span { color: var(--primary); }
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 500; }
.nav-links a:hover { color: var(--primary); }

/* 首屏 */
.hero {
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(56, 189, 248, 0.12), transparent 60%);
}
.hero h1 { font-size: clamp(1.75rem, 4vw, 2.25rem); font-weight: 700; margin: 0 0 0.5rem 0; letter-spacing: -0.02em; }
.hero h1 .hi { color: var(--primary); }
.hero .tagline { color: var(--muted); font-size: 1rem; margin: 0 0 2rem 0; max-width: 480px; margin-left: auto; margin-right: auto; }
.hero .cta { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.5rem; background: linear-gradient(135deg, var(--primary), var(--primary-dim)); color: var(--bg); text-decoration: none; font-weight: 600; border-radius: var(--radius); box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35); }
.hero .cta:hover { filter: brightness(1.08); transform: translateY(-1px); }

/* 主内容区 */
.container { max-width: 1000px; margin: 0 auto; padding: 0 1.5rem 3rem; }

/* 功能模块 */
.section-title { font-size: 1.35rem; font-weight: 600; margin: 0 0 1.25rem 0; color: var(--text); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-bottom: 2.5rem; }
.feature-card {
  background: var(--surface); border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius); padding: 1.25rem;
  transition: background .2s, border-color .2s, transform .2s;
}
.feature-card:hover { background: var(--surface-hover); border-color: rgba(56, 189, 248, 0.2); transform: translateY(-2px); }
.feature-card .icon { font-size: 1.75rem; margin-bottom: 0.5rem; }
.feature-card h3 { font-size: 1rem; font-weight: 600; margin: 0 0 0.35rem 0; }
.feature-card p { font-size: 0.875rem; color: var(--muted); margin: 0; }

/* 下载区 */
.download-box {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(14, 165, 233, 0.04));
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius); padding: 1.5rem;
  margin-bottom: 2.5rem;
}
.download-box h2 { font-size: 1.1rem; margin: 0 0 0.5rem 0; }
.download-box p { color: var(--muted); font-size: 0.9rem; margin: 0 0 1rem 0; }
.download-box .btn {
  display: inline-block; padding: 0.6rem 1.25rem; background: var(--accent); color: var(--bg); text-decoration: none; font-weight: 600; border-radius: var(--radius-sm);
}
.download-box .btn:hover { filter: brightness(1.1); }
.deploy-note { font-size: 0.8rem; color: var(--muted); margin-top: 0.75rem; opacity: 0.9; }

/* 更新日志 */
.updates { margin-bottom: 2.5rem; }
.update-list { list-style: none; padding: 0; margin: 0; }
.update-list li {
  display: flex; align-items: baseline; gap: 0.75rem; padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06); font-size: 0.9rem;
}
.update-list li:last-child { border-bottom: none; }
.update-list .ver { color: var(--primary); font-weight: 600; min-width: 4.5em; }
.update-list .date { color: var(--muted); font-size: 0.85em; }
.update-list .desc { color: var(--muted); }

/* 联系与关于 */
.about { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.about-block h3 { font-size: 0.95rem; margin: 0 0 0.5rem 0; color: var(--text); }
.about-block p { font-size: 0.9rem; color: var(--muted); margin: 0; }

/* 页脚 */
.footer {
  text-align: center; padding: 2rem 1rem;
  color: var(--muted); font-size: 0.85rem;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer a { color: var(--primary); text-decoration: none; }
.footer a:hover { text-decoration: underline; }