:root{--bg: #f6f7f9;--card: #ffffff;--ink: #1c2430;--muted: #5b6675;--accent: #0b3d64;--accent-ink: #ffffff;--line: #dde3ea;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #14181d;--card: #1e242b;--ink: #e8ecf1;--muted: #9aa6b3;--accent: #4d9fdc;--accent-ink: #0d1216;--line: #313a44}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,PingFang HK,Microsoft JhengHei,sans-serif;padding:0 16px calc(24px + env(safe-area-inset-bottom))}.site-header{display:flex;align-items:center;gap:12px;padding:14px 0;max-width:860px;margin:0 auto}.site-header .home{text-decoration:none;color:var(--muted);font-size:22px;line-height:1}.site-header h1{font-size:20px;margin:0;flex:1}.lang-toggle{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:6px 14px;font-size:14px;cursor:pointer}main{max-width:860px;margin:0 auto}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;margin:14px 0}.card h2{margin:0 0 8px;font-size:17px}.muted{color:var(--muted);font-size:14px}.small{font-size:13px}label.field{display:block;margin:12px 0 4px;font-weight:600;font-size:14px}input[type=text],input[type=number],select{width:100%;padding:12px;font-size:17px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink)}button.primary{margin-top:14px;width:100%;padding:12px;font-size:16px;font-weight:600;color:var(--accent-ink);background:var(--accent);border:0;border-radius:10px;cursor:pointer}.result{margin-top:14px;padding:14px;border-radius:10px;background:color-mix(in srgb,var(--accent) 8%,var(--card));border:1px dashed var(--line);font-size:18px;overflow-wrap:anywhere;min-height:1.5em}.result strong{font-size:22px}.copy-btn{margin-top:8px;padding:6px 12px;font-size:13px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--muted);cursor:pointer}.tool-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.tool-card{display:block;text-decoration:none;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px}.tool-card:hover{border-color:var(--accent)}.tool-card .emoji{font-size:30px}.tool-card h2{margin:8px 0 4px;font-size:17px}.site-footer{max-width:860px;margin:28px auto 0;color:var(--muted);font-size:12.5px;border-top:1px solid var(--line);padding-top:12px}.site-footer a{color:inherit}