:root{--blue:#2459eb;--ink:#182339;--muted:#758095;--line:#e7ebf2;--bg:#f7f9fc}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Arial,'Apple SD Gothic Neo','Malgun Gothic',sans-serif;background:#fff;line-height:1.65;letter-spacing:-.025em}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #8ba8ff;outline-offset:4px}.wrap{width:min(1120px,calc(100% - 48px));margin:auto}header{border-bottom:1px solid var(--line);height:88px}.header{display:flex;align-items:center;height:100%;gap:70px}.brand{display:inline-flex;align-items:center;font-size:23px;font-weight:850;letter-spacing:-1.2px}.logo{display:grid;place-items:center;width:33px;height:33px;border-radius:10px;background:var(--blue);color:#fff;margin-right:10px;font-size:29px}.brand-dot{color:var(--blue)}nav{display:flex;gap:28px;font-size:14px;font-weight:600}.header-note{margin-left:auto;font-size:12px;color:var(--muted)}.hero{padding-top:76px;padding-bottom:64px;position:relative;min-height:510px}.eyebrow{font-size:11px;color:var(--blue);font-weight:750;letter-spacing:1.8px;display:flex;align-items:center;gap:8px}.eyebrow>span{height:6px;width:6px;border-radius:50%;background:var(--blue)}h1,h2,h3,p{margin:0}h1{font-size:50px;line-height:1.35;font-weight:800;letter-spacing:-2.4px;margin-top:18px}h1 em{font-style:normal;color:var(--blue)}.hero>p{font-size:16px;color:#7b8495;line-height:1.9;margin-top:20px}.search{display:flex;align-items:center;background:#fff;border:1px solid #dce2ed;border-radius:13px;box-shadow:0 7px 20px #1b305908;max-width:510px;margin-top:30px;height:62px;padding:0 18px;gap:12px}.search>span{font-size:30px;color:var(--blue)}.search input{width:100%;min-width:0;border:0;outline:0!important;background:transparent;font-size:14px}.search kbd{white-space:nowrap;color:#8a94a8;font:10px Arial;background:#f4f6fa;border-radius:5px;padding:5px 7px;letter-spacing:.8px}.hero-tags{display:flex;gap:20px;font-size:11px;color:#8992a2;margin-top:16px}.hero-art{position:absolute;width:390px;height:340px;right:24px;top:85px;transform:rotate(-6deg)}.art-tile{position:absolute;border:1px solid #dfe6f3;border-radius:24px;display:flex;align-items:center;justify-content:center;flex-direction:column;font-weight:bold;box-shadow:0 18px 32px #2237670b}.art-a{width:145px;height:145px;left:23px;top:0;background:#2459eb;color:white;font-size:75px;transform:rotate(-7deg)}.art-b{width:152px;height:145px;left:185px;top:24px;background:#e9efff;color:#5172be;font-size:50px;transform:rotate(9deg)}.art-b span{font-size:10px;font-weight:500;letter-spacing:0;color:#8294bc}.art-c{width:141px;height:128px;left:18px;top:165px;background:#eef6f2;color:#5c9b83;font-size:65px;transform:rotate(4deg)}.art-d{width:147px;height:142px;left:183px;top:185px;background:#fff9ed;color:#c49a43;font-size:55px;line-height:1.1;transform:rotate(-3deg)}.art-d span{font-size:9px;letter-spacing:2px;margin-top:12px}.art-caption{position:absolute;top:345px;left:50px;font-size:9px;letter-spacing:2.4px;color:#a7b0c0}.tools-section{padding-top:35px;padding-bottom:64px;border-top:1px solid var(--line)}.section-heading{display:flex;align-items:flex-end;justify-content:space-between}.section-heading h2{font-size:27px;font-weight:800;letter-spacing:-1px;margin-top:7px}.section-heading>span{font-size:12px;color:#939bad}.filters{display:flex;gap:9px;margin:26px 0 25px;flex-wrap:wrap}.filters button{border:1px solid var(--line);border-radius:30px;background:white;padding:9px 19px;font-size:12px;color:#7d879a}.filters button.active{background:var(--ink);color:white;border-color:var(--ink)}.filters b{margin-left:7px;font-size:10px;color:#b9c7e0}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.tool-card{border:1px solid var(--line);border-radius:17px;padding:25px 26px 18px;position:relative;transition:transform .18s,border-color .18s,box-shadow .18s}.tool-card:hover{transform:translateY(-4px);border-color:#b8cafc;box-shadow:0 12px 28px #24385909}.tool-icon{width:48px;height:48px;border-radius:14px;background:#eaf0ff;color:var(--blue);font-size:23px;font-weight:750;display:inline-flex;align-items:center;justify-content:center;letter-spacing:-1px}.icon-1{background:#ecf6f1;color:#60957f}.icon-2{background:#fff5e6;color:#bd9953}.icon-3{background:#f1edff;color:#8a70c0}.icon-4{background:#ffefeb;color:#c58270}.icon-5{background:#eaf5f8;color:#5f94a5}.card-cat{position:absolute;right:25px;top:32px;border:1px solid #edf0f5;border-radius:5px;font-size:10px;color:#8d97a7;padding:2px 7px}.tool-card h3{font-size:18px;font-weight:750;margin-top:20px;letter-spacing:-.8px}.tool-card p{font-size:12px;color:#8991a0;line-height:1.8;margin-top:8px;min-height:43px}.card-bottom{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#8590a1;border-top:1px solid #eff1f5;margin-top:18px;padding-top:14px}.card-bottom span{font-size:17px;color:#a6b2c9}.simple-banner{display:flex;align-items:center;gap:21px;background:#f6f8fc;border:1px solid var(--line);border-radius:15px;padding:26px 30px;margin-top:36px}.banner-icon{font-size:38px;color:#718ac6}.simple-banner h3{font-size:15px}.simple-banner p{color:#929aab;font-size:12px;margin-top:3px}.simple-banner a{margin-left:auto;color:#74829b;font-size:12px;white-space:nowrap}footer{border-top:1px solid var(--line);background:#fbfcfe}.footer{display:flex;justify-content:space-between;padding:36px 0 43px;gap:30px}.footer .brand{font-size:18px}.footer p{font-size:11px;color:#7b869b;margin-top:9px}.footer small{font-size:10px;color:#9ba3b1}.footer-links{display:flex;gap:20px;font-size:11px;color:#7d8799;align-items:flex-start;padding-top:7px}.mobile{display:none}.skip{position:absolute;top:-100px}.skip:focus{top:8px;left:8px;background:white;padding:10px;z-index:10}.tool-layout{max-width:900px;padding:30px 0 60px}.breadcrumb{font-size:12px;color:#8e97a7;margin-bottom:28px}.tool-heading{display:flex;gap:20px;align-items:center;margin-bottom:30px}.tool-heading h1{font-size:31px;margin:6px 0;letter-spacing:-1.3px}.tool-heading p{font-size:14px;color:var(--muted)}.tool-heading .tool-icon{flex-shrink:0;width:62px;height:62px;font-size:30px}.workbench{border:1px solid var(--line);border-radius:20px;box-shadow:0 8px 28px #18233905;padding:30px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px;border-bottom:1px solid var(--line);padding-bottom:18px}.tabs button{border:0;background:var(--bg);border-radius:8px;padding:10px 16px;font-size:13px;color:#78849b}.tabs button.active{color:white;background:var(--blue)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.field{display:flex;flex-direction:column;gap:8px;min-width:0}.field label,.field>span{font-size:13px;font-weight:650;color:#57637a}.field input,.field select,.field textarea{border:1px solid #dce2ec;border-radius:10px;background:#fff;min-height:48px;padding:10px 14px;width:100%;min-width:0;color:var(--ink)}input[type=checkbox]{width:18px;min-height:auto;margin:0}.check{display:flex;gap:8px;align-items:center;font-size:13px;margin:18px 0}.field textarea{min-height:170px;resize:vertical;line-height:1.8}.full{grid-column:1/-1}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.primary,.secondary{border:1px solid #dae2ef;border-radius:9px;padding:11px 22px;font-size:13px;font-weight:650;background:white;color:#6c7990}.primary{border-color:var(--blue);background:var(--blue);color:white}.link-button{display:inline-block;margin-top:20px}.result{background:#f2f6ff;border:1px solid #e0e9ff;border-radius:14px;padding:24px;margin-top:25px;overflow-wrap:anywhere}.result .result-label{font-size:12px;color:#7c8da9}.result strong{display:block;font-size:31px;font-weight:750;color:var(--blue);line-height:1.5;margin:4px 0}.result p{font-size:13px;color:#667a9e}.error{color:#be3b4c!important;background:#fff4f5;border-color:#f1d4d9}.error strong{color:#be3b4c;font-size:17px}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:20px}.stat{background:#f3f6fc;border:1px solid var(--line);border-radius:12px;padding:18px 10px;text-align:center}.stat strong{display:block;color:var(--blue);font-size:28px}.stat span{font-size:11px;color:var(--muted)}.hint{font-size:12px;color:#8a94a5;margin-top:15px;line-height:1.8}.product-box{padding:20px;background:var(--bg);border:1px solid var(--line);border-radius:12px}.product-box h3{margin-bottom:18px;font-size:16px}.product-box .form-grid{gap:14px}.guide{margin-top:40px}.guide h2,.related h2{font-size:19px;margin:27px 0 12px}.guide p,.prose p{font-size:14px;color:#758096;line-height:1.95}.example{background:var(--bg);border-left:3px solid var(--blue);padding:19px 22px;font-size:14px;color:#65738c}.guide details{border-top:1px solid var(--line);padding:15px 0;font-size:14px}.guide summary{cursor:pointer;font-weight:600}.guide details p{padding-top:12px}.related>div{display:flex;flex-wrap:wrap;gap:10px}.related a{padding:12px 15px;font-size:12px;border:1px solid var(--line);border-radius:8px}.prose{max-width:800px;padding:50px 0 80px;min-height:60vh}.prose h1{font-size:34px;margin-bottom:25px}.prose h2{font-size:19px;margin-top:28px;margin-bottom:9px}.back{font-size:13px;color:var(--muted)}#toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);padding:10px 22px;background:var(--ink);color:white;border-radius:10px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:20}#toast.show{opacity:1}.qr-output{text-align:center;margin-top:25px}.qr-output canvas{max-width:100%;height:auto;image-rendering:pixelated;border:1px solid var(--line);border-radius:8px}.qr-output button{display:block;margin:15px auto}.qr-output p{font-size:12px;color:var(--muted)}[hidden]{display:none!important}
@media(max-width:950px){.hero-art{right:0;transform:scale(.8) rotate(-6deg);transform-origin:right center}.hero .search{max-width:47%}.hero h1{font-size:43px}.hero-tags{gap:10px}.footer-links{gap:12px}.tool-card{padding:23px 20px 17px}.tool-card h3{font-size:16px}.tool-grid{gap:14px}}
@media(max-width:720px){.wrap{width:calc(100% - 36px)}header{height:70px}.header{gap:20px}.brand{font-size:21px}.header-note{display:none}nav{margin-left:auto;gap:18px;font-size:12px}.hero{padding-top:44px;padding-bottom:40px;min-height:0}.hero h1{font-size:36px;letter-spacing:-1.7px}.hero>p{font-size:14px;margin-top:17px}.hero-art{display:none}.hero .search{max-width:none;margin-top:25px;height:56px}.hero-tags{justify-content:space-between;font-size:10px;margin-top:14px}.eyebrow{font-size:9px}.tools-section{padding-top:29px;padding-bottom:38px}.section-heading h2{font-size:23px}.section-heading>span{font-size:10px}.filters{gap:7px;margin-top:21px}.filters button{padding:7px 12px;font-size:11px}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.tool-card{padding:19px 15px 12px;border-radius:13px}.tool-icon{width:40px;height:40px;font-size:21px;border-radius:11px}.card-cat{display:none}.tool-card h3{font-size:15px;margin-top:17px}.tool-card p{font-size:11px;min-height:56px;margin-top:7px}.card-bottom{font-size:10px;margin-top:12px;padding-top:10px}.simple-banner{padding:20px 18px;gap:12px;margin-top:25px}.simple-banner h3{font-size:13px}.simple-banner p{font-size:10px}.simple-banner a{display:none}.banner-icon{font-size:29px}.footer{flex-direction:column;padding:26px 0;gap:18px}.footer-links{flex-wrap:wrap;gap:15px;font-size:10px}.tool-layout{padding-top:20px}.breadcrumb{margin-bottom:20px}.tool-heading{gap:13px}.tool-heading h1{font-size:24px}.tool-heading p{font-size:12px}.tool-heading .tool-icon{width:48px;height:48px;font-size:24px}.workbench{padding:20px 16px;border-radius:15px}.tabs{gap:6px}.tabs button{font-size:11px;padding:9px 11px}.form-grid{grid-template-columns:1fr;gap:15px}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.result strong{font-size:27px}.prose h1{font-size:28px}.guide p{font-size:13px}.field input,.field select,.field textarea{font-size:16px}.guide h2{font-size:18px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.guide p,.prose p{color:#526078}.guide ul,.prose ul{padding-left:22px;color:#526078;font-size:14px;line-height:1.9}.guide li,.prose li{margin:7px 0}.guide p+p,.prose p+p{margin-top:12px}.guide a,.prose a:not(.back){color:#2459eb;text-decoration:underline;text-underline-offset:3px}.guide-table{margin:16px 0 24px}.guide-table table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:13px;line-height:1.7}.guide-table th,.guide-table td{padding:12px 14px;border:1px solid var(--line);text-align:left;vertical-align:top;overflow-wrap:anywhere}.guide-table th{background:var(--bg);font-weight:700;color:#44536c}.guide-table td{color:#526078}.guide details p{padding-bottom:4px}.ad-section{margin:44px 0;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden}.ad-label{font-size:11px;color:#65738b;text-align:center;margin:0 0 12px}.ad-section .adsbygoogle{min-height:100px}noscript{display:block;font-size:14px;color:#526078;line-height:1.8}
@media(max-width:720px){.guide-table table{font-size:12px}.guide-table th,.guide-table td{padding:9px 8px}.guide ul,.prose ul{font-size:13px}.ad-section{margin:36px 0}}
.preview-notice{padding:10px 24px;background:#fff7e6;border-bottom:1px solid #f0dfbb;color:#73551e;font-size:12px;text-align:center;line-height:1.7}

/* Worked examples reuse the existing guide layout. */
.worked-case{margin:32px 0;padding:24px;border:1px solid var(--line);border-radius:14px;background:#fafbfe}.worked-case>h2:first-child{margin-top:0}.guide ol{padding-left:24px;color:#526078;font-size:14px;line-height:1.9}.guide ol li{margin:10px 0}.guide code{overflow-wrap:anywhere}.guide-table caption{text-align:left;color:#526078;margin-bottom:10px;font-size:13px}.case-hub{margin:36px 0 0;padding:24px;border:1px solid var(--line);border-radius:14px}.guide h2[id]{scroll-margin-top:30px}
@media(max-width:720px){.worked-case,.case-hub{padding:18px 14px}.guide ol{font-size:13px}.worked-case .guide-table th,.worked-case .guide-table td{padding:8px 5px}}