:root {
  --bg: #f6f8fb;        /* 页面背景：极浅灰蓝，清爽护眼 */
  --surface: #ffffff;   /* 卡片/面板：纯白 */
  --accent: #2563eb;    /* 主色：明亮的蓝 */
  --accent2: #0ea5e9;   /* 辅色：天蓝 */
  --text: #1f2937;      /* 正文：深灰，对比清晰 */
  --muted: #6b7280;     /* 次要文字：中灰 */
  --border: #e5e7eb;    /* 边框：浅灰 */
}

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

body {
  font-family: "Segoe UI", "Microsoft YaHei", -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* Header */
.hero {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.hero .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo { font-weight: 700; font-size: 18px; letter-spacing: .5px; color: var(--text); }
nav a {
  color: var(--muted); text-decoration: none; margin-left: 22px; font-size: 15px;
  transition: color .2s;
}
nav a:hover { color: var(--accent); }

/* Banner */
.banner {
  text-align: center;
  padding: 96px 24px 80px;
  background:
    radial-gradient(1200px 400px at 50% -10%, rgba(37,99,235,.12), transparent),
    linear-gradient(180deg, #ffffff, var(--bg));
}
.banner h1 {
  font-size: 40px; font-weight: 800; letter-spacing: 1px; color: var(--text);
}
.cursor { color: var(--accent); font-weight: 400; }
.subtitle { color: var(--muted); margin-top: 14px; font-size: 17px; }
.btn {
  display: inline-block; margin-top: 28px;
  padding: 12px 26px; border-radius: 10px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #ffffff; font-weight: 700; text-decoration: none;
  box-shadow: 0 8px 24px rgba(37,99,235,.25);
  transition: transform .15s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(37,99,235,.32); }

/* Content */
.content { padding: 64px 24px 48px; }
.content section { margin-bottom: 56px; }
.content h2 {
  font-size: 26px; margin-bottom: 18px; color: var(--text);
  padding-left: 12px; border-left: 4px solid var(--accent);
}
.content p { color: #4b5563; }

/* Cards */
.grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 22px; transition: transform .15s, border-color .2s, box-shadow .2s;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.card:hover {
  transform: translateY(-3px); border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(37,99,235,.10);
}
.card h3 { margin-bottom: 8px; color: var(--text); }
.tag {
  display: inline-block; margin-top: 12px; font-size: 12px;
  padding: 3px 10px; border-radius: 999px;
  background: rgba(37,99,235,.10); color: var(--accent);
}

.proj { list-style: none; }
.proj li { padding: 8px 0; color: #4b5563; }

/* Footer */
footer {
  border-top: 1px solid var(--border); background: var(--surface); padding: 28px 0; margin-top: 40px;
}
.footer-inner { text-align: center; color: var(--muted); font-size: 14px; }
.beian a { color: var(--muted); text-decoration: none; }
.beian a:hover { color: var(--accent); }

@media (max-width: 640px) {
  .banner h1 { font-size: 30px; }
  nav a { margin-left: 14px; font-size: 14px; }
}