:root{--bg: #f4f3ea;--panel: #ffffff;--panel-2: #f1f5ef;--border: #d0e0cb;--border-soft: #e2ecdf;--text: #111b22;--text-dim: #5d6c7b;--accent: #6e8f63;--accent-2: #5a7850;--navy: #335166;--navy-dark: #223644;--ok: #6e8f63;--warn: #9c6f19;--err: #cd0000;--code-bg: #111b22;--code-text: #eef3f6;--mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}*{box-sizing:border-box}body{margin:0;font-family:Inter,Helvetica Neue,system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}header{padding:16px 28px;border-bottom:1px solid var(--border);background:var(--panel);display:flex;align-items:center;gap:18px;flex-wrap:wrap}header h1{font-size:19px;margin:0;font-weight:700;color:var(--navy-dark)}header .sub{color:var(--text-dim);font-size:13px;flex:1;min-width:240px}header nav{display:flex;gap:6px}header nav a{text-decoration:none;color:var(--text-dim);font-size:13.5px;font-weight:600;padding:7px 14px;border-radius:6px}header nav 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var(--err)}.card.solutions{border-top:3px solid var(--accent)}.tag{display:inline-block;font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:2px 8px;border-radius:999px;margin-right:8px;vertical-align:1px}.tag-old{background:#9c6f191a;color:var(--warn);border:1px solid rgba(156,111,25,.35)}.tag-new{background:var(--panel-2);color:var(--accent-2);border:1px solid var(--border)}.convert-divider{display:flex;align-items:center;gap:12px;color:var(--text-dim);font-size:12.5px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;margin:2px 0 20px}.convert-divider:before,.convert-divider:after{content:"";flex:1;border-top:1px dashed var(--border)}.convert-divider .arrow{color:var(--accent);font-size:15px}textarea{width:100%;min-height:240px;border:none;outline:none;resize:vertical;background:var(--code-bg);color:var(--code-text);font-family:var(--mono);font-size:12.5px;line-height:1.55;padding:12px 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