:root {
  --bg: #0b0d12;
  --card: #171a21;
  --border: #232830;
  --accent: #4f8cff;
  --text: #e6e6e6;
  --muted: #9aa3b2;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 页头 */
.site-header {
  text-align: center;
  padding: 48px 20px 20px;
}
.site-title { font-size: 30px; letter-spacing: 1px; }
.tagline { color: var(--muted); margin-top: 8px; font-size: 15px; }

/* 项目卡片网格 */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
  flex: 1;
}
.project-card {
  display: flex;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: transform .15s, border-color .15s, box-shadow .15s;
}
.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.project-card.featured { border-color: var(--accent); }
.card-icon {
  font-size: 40px;
  line-height: 1;
  flex-shrink: 0;
}
.card-body { flex: 1; min-width: 0; }
.card-name { font-size: 20px; margin-bottom: 6px; }
.card-desc { color: var(--muted); font-size: 14px; line-height: 1.6; }
.card-tags { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  background: rgba(79,140,255,0.12);
  color: var(--accent);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 12px;
}
.card-platforms { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: var(--muted); }

/* 流程图区 */
.diagram-section {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px 40px;
}
.diagram-section.hidden { display: none; }
.diagram-section h2 { font-size: 20px; margin-bottom: 16px; }
.diagram-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}
.diagram-item {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
  transition: border-color .15s;
}
.diagram-item:hover { border-color: var(--accent); }

.site-footer {
  text-align: center;
  padding: 20px;
  color: var(--muted);
  font-size: 13px;
}
.site-footer a { color: var(--muted); }

.error { color: #ff6b6b; text-align: center; padding: 40px; }