:root{--bg: #faf9f7;--surface: #ffffff;--ink: #17252b;--muted: #5c6a72;--accent: #0f766e;--accent-soft: #e6f2f0;--border: #e5e2dc;--radius: 10px;--shadow: 0 1px 3px rgba(23, 37, 43, .08);--max-width: 1000px;--max-width-narrow: 760px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--bg)}h1,h2,h3{line-height:1.25;letter-spacing:-.01em}h1{font-size:2rem;margin:0 0 .75rem}h2{font-size:1.4rem;margin:2.25rem 0 .75rem}p{margin:0 0 1rem}a{color:var(--accent)}a:hover{text-decoration-thickness:2px}.container{max-width:var(--max-width);margin:0 auto;padding:0 1.25rem}main.container{padding-top:2rem;padding-bottom:3.5rem}.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;padding-top:.85rem;padding-bottom:.85rem}.brand{font-weight:800;font-size:1.2rem;color:var(--ink);text-decoration:none}.brand span{color:var(--accent)}.site-header nav{display:flex;gap:1.25rem}.site-header nav a{color:var(--muted);text-decoration:none;font-weight:500;font-size:.95rem}.site-header nav a:hover{color:var(--accent)}.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:2rem;padding:2rem 0;font-size:.9rem;color:var(--muted)}.site-footer nav{display:flex;flex-wrap:wrap;gap:1.25rem;margin-bottom:1rem}.site-footer a{color:var(--muted)}.hero{text-align:center;padding:2.5rem 0 1.5rem}.hero h1{font-size:2.4rem}.hero p{max-width:42rem;margin:0 auto;color:var(--muted);font-size:1.15rem}.category-section h2{margin-top:2.5rem}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;margin:1rem 0 0;padding:0;list-style:none}.tool-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.2rem;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:border-color .15s ease,transform .15s ease}.tool-card:hover{border-color:var(--accent);transform:translateY(-2px)}.tool-card h3{margin:0 0 .35rem;font-size:1.05rem;color:var(--accent)}.tool-card p{margin:0;font-size:.9rem;color:var(--muted)}.tool-page{max-width:var(--max-width-narrow);margin:0 auto}.tool-intro{color:var(--muted)}.tool-form{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem;margin:1.5rem 0 0}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1rem}.form-row{display:grid;gap:.35rem;margin-bottom:1rem}.form-grid .form-row{margin-bottom:0}.tool-form label{font-weight:600;font-size:.9rem}.tool-form input,.tool-form select,.tool-form textarea{width:100%;padding:.6rem .7rem;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit;background:#fff;color:var(--ink)}.tool-form input:focus,.tool-form select:focus,.tool-form textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}.tool-form fieldset{border:none;margin:0 0 1rem;padding:0}.btn{display:inline-block;background:var(--accent);color:#fff;border:none;border-radius:8px;padding:.6rem 1.1rem;font-size:.95rem;font-weight:600;cursor:pointer}.btn:hover{filter:brightness(1.08)}.btn-ghost{background:var(--accent-soft);color:var(--accent)}.tool-result{margin-top:1.25rem;padding:1.1rem 1.25rem;background:var(--accent-soft);border-left:4px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0}.tool-result p{margin:.25rem 0}.result-value{font-size:1.6rem;font-weight:800;color:var(--accent)}.result-error{color:#b3261e;font-weight:600}.tool-how table,.tool-result table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.92rem;background:var(--surface)}.tool-how th,.tool-how td,.tool-result th,.tool-result td{border:1px solid var(--border);padding:.5rem .7rem;text-align:left}.tool-how th,.tool-result th{background:var(--accent-soft)}.disclaimer{font-size:.85rem;color:var(--muted);border-top:1px solid var(--border);padding-top:.75rem;margin-top:1.5rem}.faq details{border-bottom:1px solid var(--border)}.faq summary{font-weight:600;padding:.85rem 0;cursor:pointer;list-style-position:outside}.faq details p{margin:0 0 1rem;color:var(--muted)}.related-list{list-style:none;padding:0;display:grid;gap:.6rem}.related-list li{display:grid}.related-list a{font-weight:600}.related-list span{font-size:.88rem;color:var(--muted)}.ad-slot{min-height:100px;margin:1.5rem 0}.ad-slot[data-position=mid]{min-height:250px}.prose{max-width:var(--max-width-narrow);margin:0 auto}.prose h2{font-size:1.25rem}@media(max-width:600px){.hero h1{font-size:1.8rem}h1{font-size:1.6rem}.tool-form{padding:1.1rem}}