:root{--bg:#f7f8fa;--card:#ffffff;--fg:#1f2937;--dim:#6b7280;--line:#e5e7eb;--acc:#2563eb;--acc-fg:#ffffff;--acc-soft:#eff6ff;--ok:#059669;--ok-bg:#ecfdf5;--warn:#b45309;--warn-bg:#fffbeb;--err:#dc2626;--err-bg:#fef2f2;--radius:12px;--shadow:0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:14px/1.7 -apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Source Han Sans SC,Noto Sans CJK SC,Microsoft YaHei,sans-serif;-webkit-font-smoothing:antialiased}header.nav{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:18px;padding:0 20px;height:56px;background:var(--card);border-bottom:1px solid var(--line);flex-wrap:wrap}header.nav .brand{font-size:15px;font-weight:600;color:var(--fg);text-decoration:none;letter-spacing:.2px;white-space:nowrap}main{padding:24px 20px 40px;max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:16px}section{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}section h2{font-size:13px;margin:0 0 12px;color:var(--dim);font-weight:600;letter-spacing:.4px}textarea{width:100%;height:150px;background:var(--card);color:var(--fg);border:1px solid var(--line);border-radius:10px;padding:11px;font:12px/1.55 ui-monospace,Menlo,Consolas,monospace;resize:vertical}textarea:focus,input:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-soft)}input[type=text]{width:100%;max-width:320px;background:var(--card);color:var(--fg);border:1px solid var(--line);border-radius:10px;padding:9px 11px;font-size:13px}.row{display:flex;gap:10px;align-items:center;margin-top:12px;flex-wrap:wrap}button{background:var(--acc);color:var(--acc-fg);border:0;border-radius:10px;padding:9px 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