:root{--bg: #0f1115;--surface: #171a21;--surface-2: #1f232c;--border: #2a2f3a;--text: #e8eaed;--text-muted: #9aa1ac;--accent: #ff5b2e;--accent-hover: #ff7a52;--success: #3ecf8e;--radius: 14px;--max-width: 780px}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.55}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover)}.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--border);padding:16px 0;position:sticky;top:0;background:#0f1115eb;backdrop-filter:blur(8px);z-index:50}.site-header .container{display:flex;align-items:center;justify-content:space-between}.logo{font-weight:700;font-size:1.15rem;color:var(--text)}.logo span{color:var(--accent)}.site-footer{border-top:1px solid var(--border);padding:24px 0;text-align:center;color:var(--text-muted);font-size:.82rem;margin-top:48px}.site-footer a{color:var(--text-muted);margin:0 8px}.ad-slot{margin:24px 0;min-height:90px;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:.75rem;border:1px dashed var(--border);border-radius:10px}.hero{padding:28px 0 24px;text-align:center}.hero h1{font-size:1.8rem;margin:0 0 8px}.hero p{color:var(--text-muted);margin:0}.calc-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin:24px 0}.field{margin-bottom:16px}.field label{display:block;font-size:.85rem;color:var(--text-muted);margin-bottom:6px}.field input,.field select{width:100%;padding:12px 14px;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;color:var(--text);font-size:1rem}.field input:focus,.field select:focus{outline:none;border-color:var(--accent)}.unit-toggle{display:flex;gap:8px;flex-wrap:wrap}.unit-toggle button{flex:1;min-width:70px;padding:10px;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;color:var(--text-muted);cursor:pointer}.unit-toggle button.active{border-color:var(--accent);color:var(--text);background:#ff5b2e1f}.btn-primary{width:100%;padding:14px;background:var(--accent);color:#fff;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;margin-top:8px}.btn-primary:hover{background:var(--accent-hover)}.result-box{margin-top:20px;padding:20px;background:var(--surface-2);border-radius:12px;text-align:center;display:none}.result-box.show{display:block}.result-box .big-number{font-size:2.4rem;font-weight:700;color:var(--success)}.result-box .label{color:var(--text-muted);font-size:.85rem;margin-top:4px}.result-table{width:100%;margin-top:16px;border-collapse:collapse;font-size:.88rem}.result-table td{padding:8px 6px;border-bottom:1px solid var(--border)}.result-table td:last-child{text-align:right;font-weight:600}.article-section{margin:32px 0}.article-section h2{font-size:1.2rem;margin-bottom:10px}.article-section p{color:#c7cbd2;font-size:.95rem}.faq-item{border-bottom:1px solid var(--border);padding:14px 0}.faq-item h3{font-size:.98rem;margin:0 0 6px}.faq-item p{color:var(--text-muted);font-size:.9rem;margin:0}.article-section ul{color:#c7cbd2;font-size:.95rem;padding-left:20px;margin:12px 0}.article-section li{margin-bottom:8px}.article-section h3{font-size:1.05rem;margin:20px 0 8px;color:var(--text)}.article-section code{background:var(--surface-2);padding:2px 6px;border-radius:4px;font-size:.88rem;color:var(--accent)}.result-table thead th{text-align:left;font-size:.8rem;color:var(--text-muted);padding:6px;border-bottom:1px solid var(--border)}.result-table thead th:last-child{text-align:right}.tool-card .icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;margin:0 auto 10px;background:var(--accent);border:none;border-radius:10px;font-size:.95rem!important;font-weight:800;letter-spacing:0px;color:#fff}.result-actions{display:flex;gap:8px;margin-top:14px}.result-actions .btn-primary{flex:1;text-decoration:none;text-align:center;font-size:.85rem}.result-range{font-size:.85rem;color:var(--text-muted);margin-top:4px}