:root{--bg:#f6f8fb;--card:#fff;--ink:#1f2933;--muted:#66707a;--primary:#2563eb;--accent:#16a34a;--kofi:#ff5e5b;--border:#e3e8ef;--shadow:0 6px 24px rgba(31,41,51,.08)}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
.hero{background:linear-gradient(135deg,#0ea5e9,#2563eb);color:#fff;text-align:center;padding:40px 20px}
.hero-inner{max-width:720px;margin:0 auto}
.hero h1{margin:0 0 6px;font-size:34px}
.tagline{font-size:16px;opacity:.95;margin:0 0 10px}
.sub{font-size:14px;opacity:.9;margin:0}
.sub strong{color:#ffe27a}
.container{max-width:920px;margin:0 auto;padding:28px 20px 60px}
.tool{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.tool-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px}
.btn{border:1px solid var(--border);background:#fff;color:var(--ink);padding:9px 15px;border-radius:9px;font-size:14px;cursor:pointer}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-accent{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-ghost{color:var(--muted)}
.indent{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:6px;margin-left:auto}
.indent select{padding:6px 8px;border:1px solid var(--border);border-radius:8px}
.editor{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:680px){.editor{grid-template-columns:1fr}}
#input,#output{height:340px;border:1px solid var(--border);border-radius:10px;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.5;overflow:auto;background:#fbfcfe;color:var(--ink);white-space:pre;margin:0}
#input{resize:vertical}
#output{background:#0f172a;color:#e2e8f0}
.status{margin-top:12px;font-size:13px;color:var(--muted)}
.status.ok{color:var(--accent)}
.status.err{color:#dc2626}
.support{margin-top:36px;background:#fff8f0;border:1px solid #ffe0c2;border-radius:14px;padding:22px;text-align:center}
.support p{color:var(--muted);font-size:14px;margin:6px 0 14px}
.support-links{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-kofi{background:var(--kofi);color:#fff;border-color:var(--kofi);text-decoration:none;display:inline-block;padding:10px 16px;border-radius:9px;font-size:14px}
.footer{text-align:center;color:var(--muted);font-size:12px;padding:24px}
.wechat-qr-wrap{display:flex;flex-direction:column;align-items:center;gap:4px}
.qr-label{font-size:13px;color:#07c160;font-weight:600}
.qr-img{width:140px;height:140px;border-radius:8px;border:2px solid #e0e0e0;object-fit:cover}