*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#4f8cff;--primary-dark:#3a72d9;--bg:#f5f7fa;--surface:#fff;--text:#1a1a2e;--text-secondary:#555;--border:#e0e0e0;--radius:8px}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif;line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}.layout{flex-direction:column;min-height:100vh;display:flex}.header{background:var(--surface);border-bottom:1px solid var(--border);z-index:100;position:sticky;top:0;box-shadow:0 1px 3px #0000000a}.header-inner{align-items:center;gap:1.5rem;max-width:1200px;margin:0 auto;padding:.8rem 1.5rem;display:flex}.logo{color:var(--text);font-size:1.3rem;font-weight:700;text-decoration:none}.logo:hover{color:var(--primary)}.breadcrumb{color:var(--text-secondary);font-size:.9rem}.breadcrumb a{color:var(--primary)}.breadcrumb .separator{color:#ccc;margin:0 .5rem}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:2rem 1.5rem}.home-page{animation:.3s fadeIn}.home-hero{text-align:center;padding:2rem 0 3rem}.home-hero h1{margin-bottom:.75rem;font-size:2.2rem}.home-hero p{color:var(--text-secondary);font-size:1.05rem}.tool-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem;display:grid}.tool-card{background:var(--surface);border:1px solid var(--border);color:inherit;border-radius:12px;padding:1.5rem;text-decoration:none;transition:transform .2s,box-shadow .2s,border-color .2s}.tool-card:hover{border-color:var(--primary);color:inherit;transform:translateY(-3px);box-shadow:0 8px 24px #4f8cff1f}.tool-icon{margin-bottom:.75rem;font-size:2.5rem}.tool-card h2{margin-bottom:.5rem;font-size:1.15rem}.tool-card p{color:var(--text-secondary);font-size:.9rem;line-height:1.5}.tool-page{animation:.3s fadeIn}.tool-page h1{margin-bottom:.5rem;font-size:1.6rem}.tool-page .tool-desc{color:var(--text-secondary);margin-bottom:1.5rem;font-size:.95rem}.loading{text-align:center;color:var(--text-secondary);padding:3rem;font-size:1.1rem}.not-found{text-align:center;color:var(--text-secondary);padding:4rem 1rem;font-size:1.2rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}