:root{--bg: #f7f8fa;--surface: #ffffff;--text: #111827;--muted: #6b7280;--border: #e5e7eb;--border-strong: #d1d5db;--primary: #0f172a;--accent: #0d9488;--accent-soft: #ccfbf1;--hover: #f3f4f6;--shadow: 0 12px 40px rgba(15, 23, 42, .12);--radius: 12px;--font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;--mono: Consolas, "Courier New", monospace}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font);color:var(--text);background:var(--bg)}button,input,textarea{font:inherit}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:10px;padding:8px 14px;cursor:pointer}button:hover{background:var(--hover)}button:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:#1e293b}.site-header{position:relative;background:var(--surface);border-bottom:1px solid var(--border)}.header-inner{max-width:1120px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:18px;text-decoration:none}.brand:hover{text-decoration:none;color:var(--text)}.brand-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--accent),#115e59);display:grid;place-items:center;color:#fff;font-size:14px;font-weight:700}.nav{display:flex;align-items:center;gap:8px;flex:1}.nav-item{position:relative;display:inline-flex;align-items:center;border:none;background:transparent;color:var(--text);padding:8px 12px;border-radius:8px;cursor:pointer;font:inherit;text-decoration:none}a.nav-item:hover{text-decoration:none;color:var(--text)}.nav-item:hover,.nav-item.open{background:var(--hover)}.nav-item .caret{display:inline-block;margin-left:4px;font-size:10px;color:var(--muted)}.header-actions{display:flex;gap:8px}.icon-btn{width:36px;height:36px;padding:0;border:1px solid var(--border);background:var(--surface);border-radius:8px;cursor:pointer;color:var(--muted)}.mega{display:none;position:absolute;left:0;right:0;top:64px;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:var(--shadow);z-index:50}.mega.open{display:block}.mega-inner{max-width:1120px;margin:0 auto;padding:28px 24px 32px;display:grid;grid-template-columns:repeat(4,1fr);gap:28px}.mega-col h3{margin:0 0 12px;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.mega-link{display:block;padding:8px 10px;margin:0 -10px;border-radius:8px;color:var(--text);text-decoration:none;font-size:14px}a.mega-link:hover{background:var(--hover);text-decoration:none;color:var(--text)}.mega-link.coming{color:var(--muted);cursor:default}.mega-link .tag{margin-left:6px;font-size:11px;color:var(--accent)}.mega-empty{font-size:13px;color:var(--muted);padding:8px 0}.hero{max-width:1120px;margin:0 auto;padding:24px 24px 8px}.hero h1{margin:0 0 6px;font-size:28px;letter-spacing:-.02em}.hero p{margin:0;max-width:640px;color:var(--muted);font-size:14px;line-height:1.5}.section{max-width:1120px;margin:0 auto;padding:20px 24px 36px}.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px}.section-head h2{margin:0;font-size:18px}.section-head span{font-size:13px;color:var(--muted)}.section-empty{margin:0;font-size:13px;color:var(--muted)}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.recent-chips{display:flex;flex-wrap:wrap;gap:10px}.recent-chip{display:inline-flex;align-items:center;padding:8px 14px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--text);text-decoration:none;font-size:14px;transition:border-color .15s ease,background .15s ease}a.recent-chip:hover{border-color:var(--border-strong);background:var(--hover);text-decoration:none;color:var(--text)}.section-head .link-btn{border:none;background:transparent;color:var(--muted);font-size:13px;cursor:pointer;padding:0}.section-head .link-btn:hover{color:var(--text)}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--text);transition:border-color .15s ease,box-shadow .15s ease}a.tool-card:hover{border-color:var(--border-strong);box-shadow:0 8px 24px #0f172a0f;text-decoration:none;color:var(--text)}.tool-card.disabled{opacity:.55;pointer-events:none}.tool-card .badge{display:inline-block;font-size:11px;font-weight:600;letter-spacing:.04em;color:var(--accent);background:var(--accent-soft);padding:3px 8px;border-radius:999px;margin-bottom:10px}.tool-card h3{margin:0 0 6px;font-size:16px}.tool-card p{margin:0;font-size:13px;color:var(--muted);line-height:1.5}.about-page{max-width:1120px;margin:0 auto;padding:56px 24px 48px}.about-page h1{margin:0 0 16px;font-size:32px;letter-spacing:-.02em}.about-page p{margin:0 0 12px;max-width:640px;color:var(--muted);font-size:16px;line-height:1.6}.about-page p:last-child{margin-bottom:0}.tool-page{max-width:1120px;margin:0 auto;padding:36px 24px 56px}.tool-meta .badge{display:inline-block;font-size:11px;font-weight:600;letter-spacing:.04em;color:var(--accent);background:var(--accent-soft);padding:3px 8px;border-radius:999px;margin-bottom:10px}.tool-meta h1{margin:0 0 8px;font-size:32px}.tool-meta p{margin:0 0 24px;color:var(--muted)}.toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.toolbar-left,.toolbar-right{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.seg{display:inline-flex;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--surface)}.seg button{border:none;border-radius:0;background:transparent;padding:8px 14px;cursor:pointer;color:var(--muted)}.seg button:hover{background:var(--hover)}.seg button.active{background:var(--primary);color:#fff}.seg button.active:hover{background:#1e293b}.switch{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);cursor:pointer;-webkit-user-select:none;user-select:none}.switch input{position:absolute;opacity:0;width:0;height:0}.switch-track{width:36px;height:20px;border-radius:999px;background:#d1d5db;position:relative;flex-shrink:0}.switch-track:after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .15s ease}.switch input:checked+.switch-track{background:var(--accent)}.switch input:checked+.switch-track:after{transform:translate(16px)}.switch input:focus-visible+.switch-track{outline:2px solid var(--accent);outline-offset:2px}.tool-error{margin:0 0 12px;padding:10px 12px;border:1px solid #fecaca;border-radius:8px;background:#fef2f2;color:#b91c1c;font-size:13px}.io-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.io-grid-single{grid-template-columns:1fr}.field-inline{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--muted)}.field-inline input[type=number],.field-inline select{width:72px;border:1px solid var(--border);border-radius:8px;padding:6px 8px;background:var(--surface);color:var(--text)}.field-inline select{width:auto;min-width:64px}.check-item{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);cursor:pointer;-webkit-user-select:none;user-select:none}.check-item input{margin:0}.panel{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;min-height:360px;display:flex;flex-direction:column}.panel-head{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-bottom:1px solid var(--border);background:#fafafa;font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--muted)}.panel-actions{display:flex;gap:6px}.panel-actions button{border:1px solid var(--border);background:#fff;border-radius:6px;padding:4px 8px;font-size:12px;cursor:pointer}.panel-actions button:hover{background:var(--hover)}.panel-body{flex:1;display:flex;min-height:0}.line-nos{width:40px;padding:14px 0;background:#f9fafb;border-right:1px solid var(--border);color:#9ca3af;font-family:var(--mono);font-size:12px;text-align:right;line-height:1.7}.line-nos div{padding-right:10px}.panel textarea{flex:1;border:none;resize:none;padding:14px;font-family:var(--mono);font-size:13px;line-height:1.7;outline:none;background:transparent;color:var(--text);min-width:0}.toast{position:absolute;bottom:16px;right:16px;background:var(--primary);color:#fff;font-size:13px;padding:8px 12px;border-radius:8px;box-shadow:var(--shadow);z-index:2}.qr-panel{min-height:360px}.qr-preview{flex:1;display:flex;align-items:center;justify-content:center;padding:24px;background:#fff}.qr-preview img{max-width:100%;height:auto;image-rendering:pixelated}.qr-placeholder{margin:0;color:var(--muted);font-size:14px}.panel-actions button:disabled{opacity:.45;cursor:not-allowed}@media(max-width:900px){.mega-inner,.card-grid,.io-grid{grid-template-columns:1fr}.hero h1{font-size:24px}.tool-meta h1{font-size:26px}}