:root{
  --bg:#f6f8fb;
  --card:#ffffff;
  --accent:#2b9cf0;
  --muted:#6b7280;
  --charity:#16a34a;
  --radius:10px;
  --container-width:980px;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Segoe UI, Roboto, "PingFang SC", "Microsoft Yahei", sans-serif;background:var(--bg);color:#0f172a}
.container{max-width:var(--container-width);margin:0 auto;padding:20px}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.site-title{margin:0;font-size:1.25rem}

.title-group{display:flex;flex-direction:row;align-items:center;gap:12px}
.site-tagline{margin:0;font-size:0.95rem;color:var(--muted);font-weight:400}
.contact{display:flex;gap:12px;align-items:center}
.email-btn{background:transparent;border:1px solid rgba(15,23,42,0.06);padding:8px 12px;border-radius:8px;cursor:pointer;display:flex;gap:8px;align-items:center}
.email-btn:hover{background:rgba(43,156,240,0.06)}
.email-btn .copy-icon{font-size:0.95rem}
.github-link{color:var(--accent);text-decoration:none;padding:8px 12px;border-radius:8px;border:1px solid transparent}
.github-link:hover{background:rgba(43,156,240,0.06)}

.main-content{padding-top:12px}
.intro p{margin:0 0 12px 0;color:var(--muted)}
.projects h2{margin:8px 0 16px}
.project-card{background:var(--card);padding:16px;border-radius:var(--radius);box-shadow:0 6px 18px rgba(12,18,32,0.06);margin-bottom:16px}
.project-meta{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.project-title{font-weight:600}
.tag{font-size:0.8rem;padding:4px 8px;border-radius:999px;background:#eef2ff;color:#3730a3}
.tag-charity{background:rgba(22,163,74,0.12);color:var(--charity);border:1px solid rgba(22,163,74,0.12)}
.project-desc{margin:0 0 12px;color:var(--muted)}
.project-actions .btn{display:inline-block;padding:8px 12px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none}
.more-projects{text-align:center;margin-top:8px}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid rgba(43,156,240,0.12)}

.site-footer{padding:20px 0;color:var(--muted);text-align:center}

.toast{position:fixed;right:20px;bottom:20px;background:#111827;color:#fff;padding:10px 14px;border-radius:8px;opacity:0;transform:translateY(8px);transition:opacity .18s ease,transform .18s ease}
.toast.show{opacity:1;transform:translateY(0)}

@media (max-width:640px){
  .header-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .container{padding:12px}
  .title-group{flex-direction:column;align-items:flex-start}
  .site-tagline{margin-top:4px}
}