:root{--bg:#f8f9fa;--surface:#fff;--border:#e2e8f0;--text:#1a202c;--text-secondary:#718096;--primary:#6c5ce7;--primary-hover:#5a4bd1;--primary-light:rgba(108,92,231,.08);--success:#38a169;--warning:#d69e2e;--danger:#e53e3e;--radius:8px;--shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);--shadow-lg:0 10px 25px rgba(0,0,0,.08)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}code,pre{font-family:SF Mono,Fira Code,Consolas,monospace}.container{max-width:1100px;margin:0 auto;padding:0 20px}.header{background:var(--surface);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}.header-inner{justify-content:space-between;height:60px}.header-inner,.logo{display:flex;align-items:center}.logo{font-size:1.2em;font-weight:700;color:var(--primary);gap:8px}.logo span{background:var(--primary);color:#fff;padding:2px 8px;border-radius:4px;font-size:.7em}.nav-links{display:flex;gap:24px;align-items:center}.nav-links a{color:var(--text-secondary);font-size:.92em;font-weight:500;transition:color .2s}.nav-links a:hover{text-decoration:none}.nav-links a.active,.nav-links a:hover{color:var(--primary)}.footer{border-top:1px solid var(--border);padding:40px 0;margin-top:60px;text-align:center;font-size:.85em}.footer,.footer a{color:var(--text-secondary)}.footer a:hover{color:var(--primary)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:box-shadow .2s,transform .2s}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:20px;gap:20px;margin:32px 0}.tool-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;transition:all .2s;cursor:pointer;display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden}.tool-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),#a29bfe);opacity:0;transition:opacity .2s}.tool-card:hover:before{opacity:1}.tool-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px);border-color:var(--primary)}.tool-card-icon{font-size:2em}.tool-card h3{font-size:1.1em;font-weight:600}.tool-card p{color:var(--text-secondary);font-size:.9em;line-height:1.5}.tool-card .tag{display:inline-block;background:var(--primary-light);color:var(--primary);padding:2px 10px;border-radius:20px;font-size:.75em;font-weight:500;align-self:flex-start}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:var(--radius);font-size:.92em;font-weight:500;cursor:pointer;border:none;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px)}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-sm{padding:6px 14px;font-size:.85em}input[type=number],input[type=text],select,textarea{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:.95em;font-family:inherit;transition:border-color .2s;background:var(--surface);color:var(--text)}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}textarea{resize:vertical;min-height:120px}label{font-size:.9em;font-weight:600;display:block;margin-bottom:6px;color:var(--text)}.text-center{text-align:center}.text-secondary{color:var(--text-secondary)}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}.flex{display:flex}.flex-wrap{flex-wrap:wrap}.gap-2{gap:8px}.gap-4{gap:16px}.items-center{align-items:center}.justify-between{justify-content:space-between}.hero{text-align:center;padding:60px 0 32px}.hero h1{font-size:2.4em;font-weight:800;background:linear-gradient(135deg,var(--primary),#a29bfe);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:12px}.hero p{color:var(--text-secondary);font-size:1.1em;max-width:600px;margin:0 auto}.tool-page{max-width:800px;margin:0 auto;padding:32px 0}.tool-header{margin-bottom:28px}.tool-header h1{font-size:1.6em;font-weight:700;margin-bottom:8px}.tool-header p{color:var(--text-secondary)}.tool-body{background:var(--surface);padding:28px}.tool-body,.tool-body .result-area{border:1px solid var(--border);border-radius:var(--radius)}.tool-body .result-area{background:var(--bg);padding:16px;margin-top:16px;min-height:60px;white-space:pre-wrap;word-break:break-word}.ad-container{background:var(--bg);border:1px dashed var(--border);border-radius:var(--radius);text-align:center;padding:20px;margin:24px 0;color:var(--text-secondary);font-size:.85em;min-height:90px;display:flex;align-items:center;justify-content:center}.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));grid-gap:12px;gap:12px;margin:16px 0}.stat-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;text-align:center}.stat-item .num{font-size:1.8em;font-weight:700;color:var(--primary)}.stat-item .lbl{font-size:.8em;color:var(--text-secondary);margin-top:4px}.toast{padding:12px 16px;border-radius:var(--radius);font-size:.9em;margin:12px 0}.toast-success{background:#f0fff4;border:1px solid #c6f6d5;color:#276749}.toast-info{background:#ebf8ff;border:1px solid #bee3f8;color:#2b6cb0}.toast-warning{background:ivory;border:1px solid #fefcbf;color:#975a16}@media (max-width:768px){.hero h1{font-size:1.6em}.tool-grid{grid-template-columns:1fr}.stat-row{grid-template-columns:repeat(2,1fr)}}