@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600&display=swap");*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--bg:#f5f6fa;--bg2:#fff;--sidebar-bg:#fff;--border:#e5e7eb;--border-light:#f0f1f3;--text:#111827;--text2:#4b5563;--text3:#9ca3af;--accent:#1a56db;--accent-light:#eef2ff;--accent-text:#3730a3;--green:#10b981;--green-light:#ecfdf5;--green-text:#065f46;--amber:#f59e0b;--amber-light:#fffbeb;--amber-text:#92400e;--purple:#8b5cf6;--purple-light:#f5f3ff;--purple-text:#5b21b6;--cyan:#06b6d4;--cyan-light:#ecfeff;--cyan-text:#0e7490;--red:#ef4444;--red-light:#fef2f2;--red-text:#991b1b;--sidebar-w:220px;--topbar-h:56px;--radius:10px;--radius-sm:7px}body{font-family:DM Sans,-apple-system,sans-serif;background:var(--bg);color:var(--text)}.layout,body{min-height:100vh}.layout,.sidebar{display:flex}.sidebar{width:var(--sidebar-w);background:var(--sidebar-bg);border-right:1px solid var(--border);position:fixed;top:0;left:0;height:100vh;overflow-y:auto;flex-direction:column;z-index:100}.sidebar-logo{display:flex;align-items:center;gap:10px;padding:18px 16px;border-bottom:1px solid var(--border-light)}.sidebar-logo img{width:38px;height:38px;object-fit:contain}.sidebar-logo-text{font-size:14px;font-weight:600;color:var(--text);line-height:1.2}.sidebar-logo-sub{font-size:10px;color:var(--text3)}.sidebar-nav{flex:1 1;padding:12px 10px}.nav-section-label{font-size:10px;font-weight:600;color:var(--text3);text-transform:uppercase;letter-spacing:.07em;padding:10px 8px 4px}.nav-item{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:var(--radius-sm);font-size:13px;color:var(--text2);text-decoration:none;transition:background .12s,color .12s;cursor:pointer;width:100%;background:none;border:none;text-align:left}.nav-item:hover{background:var(--bg);color:var(--text)}.nav-item.active{background:var(--accent-light);color:var(--accent-text);font-weight:500}.nav-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}.sidebar-footer{padding:10px;border-top:1px solid var(--border-light)}.main-content{margin-left:var(--sidebar-w);flex:1 1;display:flex;flex-direction:column;min-height:100vh}.topbar{background:var(--bg2);border-bottom:1px solid var(--border);height:var(--topbar-h);padding:0 28px;display:flex;align-items:center;justify-content:space-between;position:-webkit-sticky;position:sticky;top:0;z-index:50}.topbar-left h1{font-size:15px;font-weight:600;color:var(--text);line-height:1.2}.topbar-left p{font-size:11px;color:var(--text3)}.topbar-right{display:flex;align-items:center;gap:10px}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:500}.badge-blue{background:var(--accent-light);color:var(--accent-text)}.badge-green{background:var(--green-light);color:var(--green-text)}.page-body{padding:28px;flex:1 1}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:14px;gap:14px;margin-bottom:28px}.stat-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px}.stat-label{font-size:11px;font-weight:500;color:var(--text3);text-transform:uppercase;letter-spacing:.04em;margin-bottom:6px}.stat-value{font-size:24px;font-weight:600;color:var(--text);line-height:1;margin-bottom:4px}.stat-sub{font-size:11px;color:var(--text3)}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.section-title{font-size:13px;font-weight:600;color:var(--text)}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:12px;gap:12px;margin-bottom:32px}.tool-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-decoration:none;color:inherit;display:block;transition:border-color .15s,transform .1s;position:relative}.tool-card:hover{border-color:var(--accent);transform:translateY(-1px)}.tool-card-icon{width:38px;height:38px;border-radius:9px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:18px}.tool-card-name{font-size:13px;font-weight:600;color:var(--text);margin-bottom:5px;line-height:1.3}.tool-card-desc{font-size:12px;color:var(--text2);line-height:1.5}.tool-card-type{display:inline-block;font-size:10px;font-weight:500;padding:2px 8px;border-radius:10px;margin-top:10px}.calc-container{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:28px;max-width:680px}.calc-title{font-size:18px;font-weight:600;color:var(--text);margin-bottom:6px}.calc-desc{font-size:13px;color:var(--text2);margin-bottom:24px;line-height:1.6}.form-group{margin-bottom:18px}.form-label{display:block;font-size:12px;font-weight:500;color:var(--text2);margin-bottom:6px}.form-input,.form-select{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;color:var(--text);background:var(--bg2);outline:none;font-family:inherit;transition:border-color .15s}.form-input:focus,.form-select:focus{border-color:var(--accent)}.btn-primary{background:var(--accent);color:#fff;border:none;padding:11px 24px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;cursor:pointer;font-family:inherit;transition:opacity .15s}.btn-primary:hover{opacity:.88}.result-box{margin-top:24px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.result-title{font-size:12px;font-weight:500;color:var(--text3);text-transform:uppercase;letter-spacing:.05em;margin-bottom:14px}.result-row{display:flex;justify-content:space-between;align-items:center;padding:8px 0;border-bottom:1px solid var(--border-light);font-size:13px}.result-row:last-child{border-bottom:none}.result-key{color:var(--text2)}.result-val{font-weight:500;color:var(--text)}.result-val.highlight{color:var(--accent);font-size:15px}.article-container{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:36px 40px;max-width:760px}.article-badge{display:inline-block;font-size:11px;font-weight:500;padding:3px 10px;border-radius:20px;margin-bottom:14px}.article-title{font-size:22px;font-weight:600;color:var(--text);margin-bottom:8px;line-height:1.3}.article-meta{font-size:12px;color:var(--text3);margin-bottom:24px}.article-body h2{font-size:16px;font-weight:600;color:var(--text);margin:24px 0 8px}.article-body p{font-size:14px;color:var(--text2);line-height:1.75;margin-bottom:14px}.about-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px;margin-top:24px}.about-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:22px}.about-card h3{font-size:14px;font-weight:600;margin-bottom:8px}.about-card p{font-size:13px;color:var(--text2);line-height:1.65}@media (max-width:768px){.sidebar{display:none}.main-content{margin-left:0}.stats-grid,.tools-grid{grid-template-columns:repeat(2,1fr)}.about-grid{grid-template-columns:1fr}.page-body{padding:16px}}@media (max-width:480px){.tools-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:1fr 1fr}.article-container{padding:20px}}