:root{--bg: #f7f8fa;--surface: #ffffff;--text: #17202a;--text-muted: #5a6572;--border: #e3e7ec;--accent: #e8611d;--accent-strong: #c74e12;--accent-soft: #fdeee5;--ok: #157347;--radius: 12px;--shadow: 0 1px 3px rgb(23 32 42 / .08), 0 4px 16px rgb(23 32 42 / .05);--font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, "Cascadia Code", "Segoe UI Mono", Consolas, monospace}@media(prefers-color-scheme:dark){:root{--bg: #12161b;--surface: #1a2028;--text: #e8ecf1;--text-muted: #9aa6b2;--border: #2a323d;--accent: #ff7a33;--accent-strong: #ff8f52;--accent-soft: #2c221b;--ok: #4cc38a;--shadow: 0 1px 3px rgb(0 0 0 / .4)}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-text-size-adjust:100%}img,svg{max-width:100%}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.25;letter-spacing:-.01em}h1{font-size:clamp(1.6rem,4vw,2.2rem);margin:0 0 .35em}h2{font-size:1.35rem;margin:2em 0 .5em}h3{font-size:1.1rem;margin:1.5em 0 .4em}.container{max-width:1080px;margin:0 auto;padding:0 20px}.tool-container{max-width:860px;margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}.site-header .inner{display:flex;align-items:center;justify-content:space-between;height:60px}.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:var(--text)}.logo:hover{text-decoration:none}.logo .mark{color:var(--accent)}.site-nav a{color:var(--text-muted);margin-left:20px;font-size:.95rem}.site-nav a:hover{color:var(--text);text-decoration:none}.site-footer{margin-top:64px;padding:32px 0;border-top:1px solid var(--border);color:var(--text-muted);font-size:.9rem}.site-footer .inner{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}.site-footer a{color:var(--text-muted);margin-right:16px}.tool-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));margin:20px 0}.tool-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);color:var(--text);transition:transform .12s ease,border-color .12s ease}.tool-card:hover{transform:translateY(-2px);border-color:var(--accent);text-decoration:none}.tool-card h3{margin:0 0 6px;font-size:1.02rem}.tool-card p{margin:0;font-size:.88rem;color:var(--text-muted)}.calc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin:24px 0}.calc-grid{display:grid;gap:20px;grid-template-columns:1fr 1fr}@media(max-width:720px){.calc-grid{grid-template-columns:1fr}}.field{margin-bottom:14px}.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:4px;color:var(--text-muted)}.field .input-row{display:flex;align-items:center;gap:8px}.field input[type=number],.field select{width:100%;padding:10px 12px;font-size:1rem;font-family:var(--font);border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text)}.field input:focus,.field select:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}.field .unit{font-size:.85rem;color:var(--text-muted);white-space:nowrap}.seg{display:inline-flex;border:1px solid var(--border);border-radius:8px;overflow:hidden;margin-bottom:16px}.seg button{border:0;background:var(--surface);color:var(--text-muted);padding:8px 16px;font-size:.9rem;font-family:var(--font);cursor:pointer}.seg button.active{background:var(--accent);color:#fff;font-weight:600}.results{background:var(--accent-soft);border-radius:var(--radius);padding:18px 20px}.results h2,.results h3{margin-top:0;font-size:1rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em}.result-main{font-size:2rem;font-weight:800;color:var(--accent-strong);line-height:1.2}.result-main small{font-size:1rem;font-weight:600;color:var(--text-muted)}.result-rows{margin:12px 0 0;padding:0;list-style:none}.result-rows li{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-top:1px solid rgb(128 128 128 / .15);font-size:.95rem}.result-rows li b{font-variant-numeric:tabular-nums}.content{font-size:1rem}.content table{border-collapse:collapse;width:100%;margin:16px 0;font-size:.93rem}.content th,.content td{border:1px solid var(--border);padding:8px 12px;text-align:left}.content th{background:var(--surface)}.content tr:nth-child(2n) td{background:var(--surface)}.table-wrap{overflow-x:auto}.faq details{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:4px 16px;margin-bottom:10px}.faq summary{font-weight:600;cursor:pointer;padding:8px 0}.faq details p{margin-top:4px}.formula{font-family:var(--mono);font-size:.9rem;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:12px 16px;overflow-x:auto}.breadcrumbs{font-size:.85rem;color:var(--text-muted);margin:20px 0 8px}.hero{padding:48px 0 8px;text-align:center}.hero p{color:var(--text-muted);max-width:560px;margin:0 auto;font-size:1.05rem}.section-label{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:32px 0 4px;font-weight:700}