:root{--color-primary:#2563eb;--color-primary-dark:#1d4ed8;--color-primary-light:#dbeafe;--color-text:#1e293b;--color-text-light:#64748b;--color-bg:#f8fafc;--color-card-bg:#fff;--color-border:#e2e8f0;--color-danger:#dc2626;--color-success:#16a34a;--color-warning:#d97706;--shadow-card:0 1px 3px rgba(15,23,42,.08),0 1px 2px rgba(15,23,42,.04);--shadow-card-hover:0 8px 24px rgba(15,23,42,.12);--radius:10px}*{box-sizing:border-box}body,html{padding:0;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif;color:var(--color-text);background:var(--color-bg);line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}ol,ul{margin:0;padding:0;list-style:none}button{font-family:inherit;cursor:pointer}input,select,textarea{font-family:inherit;font-size:14px}.container{max-width:1160px;margin:0 auto;padding:0 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ease}.nav-link:hover{color:var(--color-text);background:hsla(0,0%,100%,.6)}.nav-link.active{color:var(--color-primary-dark);background:#fff;font-weight:600;box-shadow:0 1px 3px rgba(15,23,42,.1)}.nav-user .nav-link{padding:8px 4px;background:transparent;border-radius:0;font-weight:500}.nav-user .nav-link:hover{background:transparent;color:var(--color-primary)}.nav-user{display:flex;align-items:center;gap:12px}.nav-credits{background:var(--color-primary-light);color:var(--color-primary-dark);font-size:13px;font-weight:600;padding:4px 10px;border-radius:999px}.nav-cta{background:var(--color-primary);color:#fff;padding:8px 16px;border-radius:8px;font-size:14px;font-weight:600;transition:background .15s ease}.nav-cta:hover{background:var(--color-primary-dark)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:8px;padding:10px 20px;font-size:14px;font-weight:600;cursor:pointer;transition:all .15s 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(max-width:960px){.tool-grid{grid-template-columns:repeat(2,1fr)}.tool-detail-grid{grid-template-columns:1fr}.stat-grid{grid-template-columns:repeat(2,1fr)}.sticky-side{position:static}}@media (max-width:640px){.stat-grid,.tool-grid{grid-template-columns:1fr}.hero h1{font-size:28px}.hero-stats{gap:24px}.nav-bar{height:auto;flex-wrap:wrap;padding:12px 16px}.nav-links{gap:12px}.footer-inner{flex-direction:column}.footer-links{gap:24px}.auth-card{padding:24px}table td,table th{padding:8px}}.badge-green{background:#dcfce7;color:#15803d}.badge-gray{background:#f3f4f6;color:#6b7280}.btn-link{background:none;border:none;color:#2563eb;cursor:pointer;padding:2px 6px;font-size:13px}.btn-link.danger{color:#b91c1c}.muted{color:#6b7280}.card h3{color:#111827}.card input:not([type]),.card input[type=number],.card input[type=text],.card select,.card textarea{border:1px solid #e5e7eb;border-radius:6px;padding:6px 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