/* Convert & Count - original responsive interface. No external fonts. */
:root{--ink:#172841;--muted:#5f6d80;--blue:#315ce8;--blue-dark:#2346bc;--paper:#fafbf8;--white:#fff;--line:#e0e5eb;--pale-blue:#edf2ff;--pale-violet:#f1edff;--pale-mint:#e9f6ee;--pale-peach:#fff0e5;--lime:#d4ef80;--radius:18px;--shadow:0 14px 40px #1c31580a;--font:ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;font-family:var(--font);font-size:16px;line-height:1.65;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}input,select,textarea{max-width:100%}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #315ce8;outline-offset:4px}img,svg{max-width:100%}svg.icon{width:21px;height:21px;flex:none;vertical-align:middle;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4{line-height:1.18;letter-spacing:-.035em}h1{font-size:clamp(34px,4vw,52px);font-weight:720}h2{font-size:32px;font-weight:680}h3{font-size:20px;font-weight:660}p{margin-bottom:1rem}small{font-size:13px}.container{width:min(1200px,calc(100% - 64px));margin-inline:auto}.narrow{width:min(790px,calc(100% - 64px));margin-inline:auto}.muted{color:var(--muted)}.eyebrow{display:flex;align-items:center;gap:9px;text-transform:uppercase;font-size:11px;letter-spacing:.16em;font-weight:750;color:#526178;margin-bottom:18px}.eyebrow .dot{width:7px;height:7px;display:inline-block;background:var(--blue);border-radius:50%}.pill{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:30px;background:var(--pale-blue);color:#244cba;font-size:12px;font-weight:650;white-space:nowrap}.pill.manual{background:#fff1d7;color:#815213}.button{display:inline-flex;justify-content:center;align-items:center;gap:10px;min-height:48px;padding:11px 19px;border-radius:10px;border:1px solid transparent;background:var(--blue);color:white;font-weight:650;font-size:14px;line-height:1.35;transition:background .15s,transform .15s}.button:hover{background:var(--blue-dark);text-decoration:none;transform:translateY(-1px)}.button.secondary{background:white;color:var(--ink);border-color:var(--line)}.button.secondary:hover{background:#f3f6fa}.button.ghost{background:transparent;color:var(--ink);border-color:transparent}.button.ghost:hover{background:#eef1f5}.button.small{min-height:40px;padding:9px 13px;font-size:13px}.text-link{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:650}.skip-link{position:fixed;top:-80px;left:20px;z-index:500;background:var(--ink);color:#fff;padding:12px 20px;border-radius:8px}.skip-link:focus{top:10px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}
/* Navigation */
.site-header{background:#fafbf8f5;border-bottom:1px solid var(--line);position:relative;z-index:100}.header-inner{height:86px;display:flex;align-items:center;justify-content:space-between;gap:26px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:720;font-size:22px;letter-spacing:-1px;white-space:nowrap;line-height:1}.brand:hover{text-decoration:none}.brand-symbol{width:36px;height:36px;flex:none}.brand .amp{font-weight:400;color:var(--blue);margin:0 1px}.nav-links{display:flex;align-items:center;gap:26px}.nav-links>a:not(.button){font-size:14px;font-weight:570;color:var(--muted);white-space:nowrap}.nav-links>a[aria-current=page]{color:var(--blue)}.menu-toggle{display:none;width:44px;height:44px;background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--ink)}
/* Home */
.home-hero{padding:72px 0 62px;position:relative;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.18fr 1fr;align-items:center;gap:74px}.hero-copy h1{font-size:clamp(43px,5.25vw,68px);line-height:1.035;letter-spacing:-.06em;margin-bottom:22px;max-width:650px}.hero-copy h1 span{position:relative;display:inline-block;isolation:isolate}.hero-copy h1 span:after{content:"";position:absolute;z-index:-1;inset:57% -5px 0;background:var(--lime);border-radius:4px;transform:rotate(-1deg)}.hero-copy>p{font-size:18px;color:var(--muted);max-width:480px;line-height:1.7;margin-bottom:28px}.hero-search{display:flex;gap:8px;padding:7px 7px 7px 16px;border:1px solid #ccd5e3;border-radius:12px;background:#fff;box-shadow:0 5px 14px #1b326005;align-items:center}.hero-search input{border:0;background:none;outline:none;width:100%;min-width:0;font-size:14px;color:var(--ink);height:40px}.hero-search .button{width:45px;min-height:44px;padding:10px;flex:none}.hero-quick{display:flex;flex-wrap:wrap;gap:9px;margin:14px 0 0;font-size:12px;align-items:center;color:var(--muted)}.hero-quick a{color:var(--muted);border-bottom:1px solid #b8c1ce;line-height:1.6}.demo-wrap{position:relative;padding:22px 0 18px 16px}.demo-wrap:before{content:"";position:absolute;inset:0 -25px -12px -17px;border:1px solid #d7dfeb;background-image:radial-gradient(#c6d1e2 1.2px,transparent 1.2px);background-size:18px 18px;border-radius:35px;transform:rotate(4deg);z-index:-1}.demo-card{background:#fff;border:1px solid #dbe2ec;border-radius:20px;box-shadow:0 24px 54px #1c31580e;padding:27px 28px;position:relative}.demo-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.demo-top .mini-label{text-transform:uppercase;letter-spacing:.12em;font-size:10px;font-weight:750;color:var(--muted)}.demo-card h2{font-size:25px;line-height:1.24;margin-bottom:8px}.demo-card>p{font-size:13px;color:var(--muted);margin-bottom:18px}.demo-card label{font-size:12px;font-weight:650;display:block;margin-bottom:6px}.demo-input{display:flex;gap:8px}.demo-input input{background:#f8fafc;border:1px solid var(--line);border-radius:9px;padding:10px 12px;min-width:0;width:100%;font-size:15px}.demo-input button{width:45px;min-height:45px;padding:10px;flex:none}.demo-answer{margin-top:18px;padding:19px 21px;background:var(--pale-blue);border:1px solid #dbe5ff;border-radius:12px;display:flex;align-items:center;justify-content:space-between}.demo-answer small{display:block;font-size:11px;font-weight:600;color:#536389}.demo-answer strong{font-size:37px;letter-spacing:-.06em;line-height:1.2;color:#244fc9}.demo-answer .demo-bars{display:flex;gap:6px;align-items:flex-end;height:46px}.demo-bars i{width:9px;border-radius:3px 3px 0 0;background:#b6cafa;display:block}.demo-bars i:nth-child(2),.demo-bars i:nth-child(4){background:#6e95ef}.demo-bars i:nth-child(3){background:#315ce8}.demo-card .demo-foot{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--muted);margin-top:16px}.demo-bubble{position:absolute;right:-30px;bottom:-12px;display:flex;align-items:center;gap:8px;background:var(--lime);border:1px solid #bad969;box-shadow:0 6px 18px #1c315808;font-size:11px;font-weight:650;padding:10px 13px;border-radius:10px;transform:rotate(-3deg)}.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;gap:28px}.trust-item{display:flex;align-items:center;justify-content:center;gap:13px}.trust-item .icon{color:var(--blue);width:24px;height:24px}.trust-item strong{font-size:14px;display:block}.trust-item small{font-size:12px;color:var(--muted);display:block}.home-section{padding:65px 0}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:26px}.section-heading h2{margin-bottom:7px}.section-heading p{font-size:15px;color:var(--muted);margin:0}.section-heading .text-link{white-space:nowrap;margin-bottom:4px}.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.category-tile{padding:22px 20px;display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:13px;color:var(--ink);background:#fff;transition:transform .15s,border-color .15s}.category-tile:hover{transform:translateY(-3px);border-color:#b5c5e9;text-decoration:none}.icon-box{display:inline-flex;align-items:center;justify-content:center;width:43px;height:43px;flex:none;border-radius:11px;background:var(--pale-blue);color:#315ce8}.icon-box.violet{background:var(--pale-violet);color:#7752ba}.icon-box.mint{background:var(--pale-mint);color:#267959}.icon-box.peach{background:var(--pale-peach);color:#af653b}.category-tile strong{font-size:14px;display:block;line-height:1.35;margin-bottom:4px}.category-tile small{font-size:11px;color:var(--muted)}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.tool-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:25px;position:relative;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex;flex-direction:column;min-width:0}.tool-card:hover{transform:translateY(-3px);border-color:#b5c5e9;box-shadow:var(--shadow)}.tool-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.tool-card .icon-box{width:42px;height:42px}.tool-card .category-name{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:650}.tool-card h3{font-size:19px;line-height:1.35;margin-bottom:8px;letter-spacing:-.025em}.tool-card h3 a{color:var(--ink)}.tool-card h3 a:hover{color:var(--blue);text-decoration:none}.tool-card p{font-size:13px;color:var(--muted);line-height:1.7;margin-bottom:20px}.tool-card .card-bottom{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px}.tool-card .card-link{display:inline-flex;align-items:center;gap:8px;font-weight:650;font-size:12px}.save-tool{color:#7c8795;display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:8px;border:0;background:transparent}.save-tool:hover{background:#edf2ff;color:var(--blue)}.save-tool[aria-pressed=true]{color:var(--blue);background:var(--pale-blue)}.save-tool[aria-pressed=true] svg{fill:#cfddff}.story-panel{background:#edf2fc;border:1px solid #dae3f4;border-radius:22px;display:grid;grid-template-columns:1.1fr 1fr;gap:60px;padding:45px 48px;align-items:center}.story-panel h2{font-size:36px;max-width:440px;margin-bottom:16px}.story-panel p{color:var(--muted);font-size:15px}.story-steps{display:grid;gap:25px}.story-step{display:flex;gap:15px}.story-step .step-num{display:grid;place-items:center;width:31px;height:31px;border:1px solid #c9d6ec;border-radius:50%;flex:none;font-size:12px;font-weight:700;color:#456294}.story-step strong{display:block;font-size:15px;margin-bottom:3px}.story-step p{margin:0;font-size:13px}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.guide-card{border-top:2px solid var(--line);padding:20px 0}.guide-card .eyebrow{font-size:9px;margin-bottom:11px}.guide-card h3{font-size:21px;line-height:1.4}.guide-card h3 a{color:var(--ink)}.guide-card p{font-size:14px;color:var(--muted)}.bottom-cta{display:flex;align-items:center;justify-content:space-between;gap:26px;background:var(--lime);border:1px solid #c0db80;border-radius:18px;padding:34px 40px;margin-bottom:65px}.bottom-cta h2{font-size:28px;margin-bottom:5px}.bottom-cta p{margin:0;font-size:14px;color:#46582f}.bottom-cta .button{background:var(--ink)}
/* Directories */
.page-intro{padding:42px 0 30px}.breadcrumbs{font-size:12px;color:var(--muted);display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:0 0 25px}.breadcrumbs a{color:var(--muted)}.breadcrumbs .icon{height:12px;width:12px}.page-intro h1{margin-bottom:12px}.page-intro p{color:var(--muted);max-width:780px;font-size:17px}.directory-bar{padding:19px;background:white;border:1px solid var(--line);border-radius:14px;display:flex;align-items:center;gap:14px;margin:4px 0 18px}.directory-search{position:relative;flex:1;min-width:0}.directory-search>.icon{position:absolute;left:13px;top:13px;color:#77869a}.directory-search input{width:100%;height:48px;border:1px solid var(--line);border-radius:8px;padding:11px 15px 11px 42px;background:#fbfcfe;color:var(--ink);font-size:14px}.directory-bar select{height:48px;max-width:220px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px 30px 8px 13px;font-size:13px;color:var(--ink)}.filter-faves{min-height:48px;display:flex;align-items:center;justify-content:center;gap:7px;padding:10px 13px;background:white;border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--muted)}.filter-faves[aria-pressed=true]{color:var(--blue);border-color:var(--blue);background:var(--pale-blue)}.directory-count{font-size:12px;color:var(--muted);margin-bottom:20px;display:flex;justify-content:space-between}.directory{padding-bottom:65px}.empty-state{padding:55px 25px;background:white;border:1px dashed #cbd3de;border-radius:16px;text-align:center}.empty-state h2{font-size:22px;margin-bottom:10px}.empty-state p{font-size:14px;color:var(--muted)}
/* Calculator pages */
.tool-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.tool-heading h1{font-size:clamp(32px,4vw,46px);max-width:930px}.tool-heading .save-tool{width:45px;height:45px;border:1px solid var(--line);background:#fff;flex:none}.tool-meta{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin:18px 0 0;color:var(--muted);font-size:12px}.tool-meta span{display:inline-flex;align-items:center;gap:6px}.tool-meta .icon{width:15px;height:15px;color:#377969}.scope-banner{background:#fff5e3;border:1px solid #efdcba;border-radius:12px;padding:15px 19px;font-size:13px;line-height:1.65;color:#72501f;margin:0 0 24px}.scope-banner strong{font-weight:700}.calc-grid{display:grid;grid-template-columns:minmax(0,.88fr) minmax(0,1.12fr);align-items:start;gap:24px;margin-bottom:54px}.input-panel,.result-panel{background:#fff;border:1px solid var(--line);border-radius:18px;min-width:0;overflow:hidden;box-shadow:var(--shadow)}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:22px 25px 18px;border-bottom:1px solid var(--line)}.panel-head h2{font-size:18px;margin:0;letter-spacing:-.025em}.panel-head .step-tag{font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:650}.calc-form{padding:23px 25px 25px}.form-note{font-size:12px;color:var(--muted);margin-bottom:22px;line-height:1.6}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:19px 16px}.field{min-width:0}.field.full,.field-grid>.field:only-child{grid-column:1/-1}.field label{display:block;font-size:12px;line-height:1.5;font-weight:650;margin-bottom:7px;color:#30425d}.field input,.field textarea,.field select{width:100%;background:#fafbfd;border:1px solid #ced6e2;border-radius:8px;color:var(--ink);padding:11px 12px;font-size:15px;min-height:46px;line-height:1.5}.field textarea{min-height:118px;resize:vertical;font-variant-numeric:tabular-nums;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:14px}.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--blue);background:#fff;outline:2px solid #d7e3ff;outline-offset:0}.field-help{display:block;color:var(--muted);font-size:11px;line-height:1.6;margin-top:6px}.form-actions{display:flex;align-items:center;gap:10px;margin-top:25px}.form-actions>.button:first-child{flex:1}.input-foot{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:6px;margin:16px 0 0}.input-foot .icon{height:13px;width:13px;color:#377969}.form-error{margin:18px 0 0;background:#fff0ed;color:#9e3124;border:1px solid #eebcb4;font-size:13px;padding:12px;border-radius:8px}.example-button{background:none;border:0;padding:2px;color:var(--blue);font-size:11px;font-weight:650;min-height:32px;white-space:nowrap}.result-empty{padding:46px 30px 38px;text-align:center;display:flex;align-items:center;flex-direction:column;justify-content:center;min-height:350px;background:linear-gradient(155deg,#f3f6ff,#fff 70%)}.result-empty .empty-glyph{font-size:50px;line-height:1;width:95px;height:95px;display:grid;place-items:center;background:#e8efff;border:1px solid #d8e2fa;border-radius:22px;color:#4770d8;margin-bottom:24px;font-weight:400}.result-empty h3{font-size:24px;margin-bottom:9px}.result-empty p{font-size:13px;color:var(--muted);max-width:295px;margin:0}.result-content{padding:25px;outline:none}.answer-box{background:var(--pale-blue);border:1px solid #dce5fc;border-radius:12px;padding:21px 23px;margin-bottom:20px}.answer-label{font-size:11px;font-weight:650;color:#476294;margin-bottom:9px;letter-spacing:.01em}.answer-value{font-size:clamp(28px,3vw,40px);font-weight:710;line-height:1.19;letter-spacing:-.04em;color:#2248ba;overflow-wrap:anywhere;word-break:normal}.answer-value.long{font-size:24px;line-height:1.4;letter-spacing:-.025em}.answer-subtitle{font-size:12px;color:#586c92;margin:10px 0 0;overflow-wrap:anywhere}.result-status{padding:9px 13px;margin:0 0 15px;background:#fff7e5;color:#80601d;border-radius:8px;font-size:12px}.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:24px}.metric{border-left:2px solid #dae2f0;padding-left:12px;min-width:0}.metric small{color:var(--muted);font-size:10px;line-height:1.5;display:block;margin-bottom:6px}.metric strong{font-size:15px;line-height:1.4;display:block;overflow-wrap:anywhere}.result-section{margin-top:24px}.result-section h3{font-size:15px;letter-spacing:-.015em;margin-bottom:13px}.working-steps{list-style:none;counter-reset:working;margin:0;padding:0;display:grid;gap:13px}.working-steps li{counter-increment:working;display:flex;gap:10px;font-size:12px;color:#53637a;line-height:1.7;overflow-wrap:anywhere;min-width:0}.working-steps li:before{content:counter(working);display:grid;place-items:center;flex:none;width:21px;height:21px;margin-top:2px;background:#eff3f8;border-radius:50%;font-size:10px;font-weight:650;color:#69809f}.working-steps li span{min-width:0}.result-note{margin:22px 0 0;padding:13px 14px;background:#f6f8fa;border-left:3px solid #bac9dc;border-radius:0 7px 7px 0;font-size:11px;color:var(--muted);line-height:1.75}.result-tools{display:flex;gap:7px;flex-wrap:wrap;padding-top:21px;margin-top:22px;border-top:1px solid var(--line)}.result-tools button{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:7px;background:white;color:#53637a;padding:8px 10px;font-size:11px;min-height:36px}.result-tools button:hover{background:#f3f6fa}.result-tools .icon{width:14px;height:14px}.table-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:9px;margin-top:8px}.data-table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums;font-size:11px;line-height:1.6}.data-table th{background:#f4f7fb;text-align:left;color:#445d7d;font-weight:650;font-size:10px;padding:10px 12px;border-bottom:1px solid var(--line)}.data-table td{padding:9px 12px;border-bottom:1px solid #edf0f4;white-space:nowrap;color:#58677b}.data-table tr:last-child td{border-bottom:0}.data-table tbody tr:nth-child(even){background:#fcfdfe}.show-rows{background:none;border:0;color:var(--blue);font-size:12px;padding:12px 0 2px}.plot-frame{border:1px solid var(--line);background:#fcfdff;border-radius:10px;padding:10px 5px 5px;overflow:hidden}.plot-frame svg{display:block;width:100%;height:auto;overflow:visible}.plot-legend{display:flex;gap:13px;flex-wrap:wrap;justify-content:center;margin:8px 8px 9px}.plot-legend span{display:inline-flex;align-items:center;gap:5px;font-size:10px;color:#63738a}.plot-legend i{display:inline-block;width:13px;height:3px;border-radius:2px}.plot-caption{font-size:10px;color:#6f7c8e;padding:6px 10px 0;line-height:1.5}.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:17px}.keypad button{border:1px solid #dce3ed;background:#fff;min-height:43px;border-radius:7px;color:var(--ink);font-size:16px}.keypad button.operator{background:#f0f4fe;color:var(--blue)}.keypad button:hover{background:#e7efff}.swap-units{display:inline-flex;align-items:center;gap:7px;background:none;border:0;color:var(--blue);padding:12px 0 0;font-size:12px;font-weight:650}.learning-grid{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(0,1fr);gap:56px;margin-bottom:65px}.article-body h2{font-size:26px;margin:0 0 16px}.article-body h3{font-size:20px;margin-top:28px;margin-bottom:13px}.article-body p{font-size:14px;line-height:1.9;color:#5c6a7c}.article-body .formula{padding:18px 20px;border:1px solid #e0e7f0;background:#f1f5fb;border-radius:10px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:13px;color:#355685;line-height:1.8;overflow-wrap:anywhere;margin:20px 0}.example-block{padding:19px 21px;background:#f0f7ed;border:1px solid #d9e9d2;border-radius:10px;margin:22px 0}.example-block .eyebrow{color:#54794c;font-size:9px;margin-bottom:10px}.example-block p{font-size:13px;color:#4e654a;margin-bottom:8px}.example-block strong{color:#304c2c;overflow-wrap:anywhere}.faq{border-top:1px solid var(--line);margin-top:30px}.faq details{border-bottom:1px solid var(--line);padding:17px 0}.faq summary{font-size:14px;font-weight:650;cursor:pointer;line-height:1.6;padding-right:18px}.faq details p{font-size:13px;margin:12px 0 2px}.sidebar{min-width:0}.side-box{padding:22px;border:1px solid var(--line);border-radius:13px;background:white;margin-bottom:20px}.side-box h3{font-size:16px;margin-bottom:17px}.side-box a{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:11px 0;border-top:1px solid #edf0f3;color:#56677e;font-size:12px;line-height:1.5}.side-box a:hover{color:var(--blue);text-decoration:none}.side-box a .icon{width:13px;height:13px}.side-box p{font-size:12px;color:var(--muted);line-height:1.8;margin-bottom:0}.side-box.tint{background:#eef5ff;border-color:#dae5f5}.source-list{margin:14px 0;padding:0;list-style:none}.source-list li{margin:9px 0;font-size:12px;line-height:1.7}.source-list a{overflow-wrap:anywhere}.content-page{padding-top:46px;padding-bottom:70px}.content-page h1{font-size:44px;margin-bottom:17px}.content-page .lede{font-size:18px;color:var(--muted);line-height:1.8;margin-bottom:35px}.content-page h2{font-size:25px;margin-top:34px}.content-page p,.content-page li{font-size:15px;color:#59697e;line-height:1.9}.content-page ul,.content-page ol{padding-left:23px}.content-page code{background:#edf1f7;padding:3px 5px;border-radius:4px;font-size:13px}.content-page .date{font-size:12px;color:#738097}.source-section{padding-top:12px}.nojs-warning{padding:16px 24px;background:#fff4d8;border-bottom:1px solid #ead1a5;font-size:14px;color:#6d551c}.toast{visibility:hidden;opacity:0;position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(100px);max-width:calc(100% - 36px);padding:12px 20px;z-index:1000;background:var(--ink);color:#fff;border-radius:10px;font-size:13px;box-shadow:0 10px 30px #14243b25;transition:transform .2s;pointer-events:none}.toast.show{visibility:visible;opacity:1;transform:translateX(-50%) translateY(0)}
/* Footer */
.site-footer{background:#16273f;color:#dfe7f5;padding:48px 0 22px}.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:38px;padding-bottom:38px}.site-footer .brand{color:white;font-size:22px}.site-footer .brand .amp{color:#b5c8ff}.footer-brand p{font-size:12px;color:#9aacc5;margin:17px 0 0;max-width:250px;line-height:1.8}.footer-col strong{font-size:12px;display:block;margin-bottom:15px;color:#d9e5f7}.footer-col a{display:block;font-size:12px;color:#9aacc5;margin:9px 0}.footer-col a:hover{color:white}.footer-bottom{border-top:1px solid #ffffff15;padding-top:19px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:10px;color:#899ebc}.footer-bottom span:last-child{max-width:520px;text-align:right;line-height:1.7}
@media(min-width:1450px){.home-hero{padding-top:90px;padding-bottom:80px}.hero-copy h1{font-size:70px}}
@media(max-width:1100px){.nav-links{gap:18px}.nav-links>a:not(.button){font-size:12px}.brand{font-size:20px}.hero-grid{gap:42px}.demo-wrap{padding-left:0}.demo-bubble{right:-6px}.category-grid{grid-template-columns:repeat(3,1fr)}.tool-card{padding:21px}.hero-copy h1{font-size:56px}.story-panel{gap:35px;padding:35px}.calc-grid{gap:18px}.calc-form,.result-content{padding:21px}.panel-head{padding:20px 21px}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.metrics .metric:last-child:nth-child(odd){grid-column:1/-1}.learning-grid{gap:32px}.header-inner{gap:20px}.nav-links .button{padding:10px 13px;font-size:12px}}
@media(max-width:820px){.container,.narrow{width:calc(100% - 40px)}.header-inner{height:74px}.menu-toggle{display:inline-grid;place-items:center;flex:none}.nav-links{display:none;position:absolute;top:73px;left:0;right:0;padding:20px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 15px 25px #1728410a;flex-direction:column;align-items:stretch;gap:7px}.nav-links.open{display:flex}.nav-links>a:not(.button){font-size:15px;padding:10px 9px}.nav-links .button{font-size:14px;margin-top:5px}.hero-grid{gap:38px;grid-template-columns:1fr 1fr}.hero-copy h1{font-size:44px}.hero-copy>p{font-size:15px}.hero-search{padding-left:11px}.hero-search>svg{display:none}.hero-search input{font-size:12px}.demo-card{padding:20px}.demo-card h2{font-size:21px}.demo-wrap:before{inset:0 -6px -5px -9px}.demo-bubble{font-size:10px;right:-3px;bottom:-3px}.trust-item{gap:9px}.trust-item strong{font-size:12px}.trust-item small{font-size:10px}.tool-grid{grid-template-columns:repeat(2,1fr)}.home-section{padding:50px 0}.category-grid{grid-template-columns:repeat(2,1fr)}.section-heading h2{font-size:28px}.section-heading p{font-size:13px}.story-panel{gap:30px;padding:28px}.story-panel h2{font-size:28px}.story-panel p{font-size:13px}.guide-grid{gap:20px}.guide-card h3{font-size:18px}.guide-card p{font-size:12px}.footer-top{grid-template-columns:1.6fr 1fr 1fr;gap:28px}.footer-col:last-child{display:none}.calc-grid{grid-template-columns:1fr;gap:20px;max-width:740px;margin-inline:auto}.result-empty{min-height:260px}.metrics{grid-template-columns:repeat(3,minmax(0,1fr))}.metrics .metric:last-child:nth-child(odd){grid-column:auto}.learning-grid{grid-template-columns:1fr 280px;gap:25px}.tool-heading h1{font-size:36px}.answer-value{font-size:37px}.directory-bar{flex-wrap:wrap}.directory-search{flex-basis:100%}.directory-bar select{flex:1;max-width:none}.filter-faves{flex:none}.page-intro{padding-top:28px}.footer-bottom span:last-child{max-width:330px}.content-page h1{font-size:36px}.bottom-cta{padding:28px}.bottom-cta h2{font-size:25px}}
@media(max-width:600px){.container,.narrow{width:calc(100% - 32px)}.header-inner{height:69px}.nav-links{top:68px}.brand{font-size:20px;gap:8px}.brand-symbol{width:31px;height:31px}.home-hero{padding:42px 0 40px}.hero-grid{grid-template-columns:1fr;gap:35px}.hero-copy h1{font-size:51px;letter-spacing:-.055em;max-width:390px;margin-bottom:20px}.hero-copy>p{font-size:16px;max-width:360px;margin-bottom:23px}.eyebrow{font-size:10px;margin-bottom:17px}.hero-search{max-width:490px}.hero-search>svg{display:block}.hero-search input{font-size:14px}.demo-wrap{padding:10px 6px 15px;max-width:440px;width:100%;margin:0 auto}.demo-wrap:before{inset:0 6px 6px 6px;border-radius:23px;transform:rotate(3deg)}.demo-card{padding:24px}.demo-card h2{font-size:24px}.demo-card>p{font-size:13px}.demo-top{margin-bottom:15px}.demo-bubble{right:0;bottom:0}.demo-answer{margin-top:15px}.trust-strip{gap:12px;padding:21px 0}.trust-item{flex-direction:column;gap:7px;text-align:center}.trust-item .icon{height:19px;width:19px}.trust-item strong{font-size:11px}.trust-item small{font-size:9px}.home-section{padding:39px 0}.section-heading{gap:15px;align-items:flex-start;margin-bottom:21px}.section-heading h2{font-size:26px;line-height:1.25}.section-heading .text-link{font-size:11px;margin-top:8px;gap:4px}.section-heading p{font-size:13px;max-width:260px}.category-grid{gap:10px}.category-tile{padding:15px 12px;gap:9px}.category-tile .icon-box{width:34px;height:34px;border-radius:9px}.category-tile .icon-box .icon{width:18px;height:18px}.category-tile strong{font-size:12px;letter-spacing:-.02em}.category-tile small{font-size:10px}.tool-grid{gap:12px}.tool-card{padding:17px;border-radius:13px}.tool-card-top{margin-bottom:14px}.tool-card .icon-box{width:35px;height:35px;border-radius:9px}.tool-card .category-name{font-size:8px;letter-spacing:.06em;max-width:83px;text-align:right}.tool-card h3{font-size:16px;line-height:1.4}.tool-card p{font-size:11px;line-height:1.7;margin-bottom:15px}.tool-card .card-link{font-size:10px;gap:3px}.tool-card .card-link .icon{width:13px;height:13px}.save-tool{width:28px;height:32px}.tool-card .save-tool .icon{width:16px;height:16px}.pill.manual{font-size:9px;white-space:normal;line-height:1.4;padding:3px 7px}.story-panel{grid-template-columns:1fr;padding:25px;gap:25px;border-radius:17px}.story-panel h2{font-size:31px;max-width:350px}.story-steps{gap:19px}.story-step strong{font-size:14px}.story-step p{font-size:12px}.guide-grid{grid-template-columns:1fr;gap:5px}.guide-card{padding:20px 0 8px}.guide-card h3{font-size:20px;margin-bottom:10px}.guide-card p{font-size:13px}.bottom-cta{flex-direction:column;align-items:flex-start;padding:25px;margin-bottom:42px;gap:20px}.bottom-cta h2{font-size:26px}.bottom-cta .button{font-size:12px}.site-footer{padding:36px 0 20px}.footer-top{grid-template-columns:1fr 1fr;gap:26px;padding-bottom:24px}.footer-brand{grid-column:1/-1}.footer-brand p{max-width:330px;margin-top:13px}.footer-bottom{align-items:flex-start;flex-direction:column;gap:12px}.footer-bottom span:last-child{text-align:left;max-width:none}.page-intro h1,.tool-heading h1{font-size:32px;line-height:1.17}.tool-heading{gap:14px}.tool-heading .save-tool{width:39px;height:41px}.page-intro p{font-size:14px}.breadcrumbs{font-size:10px;margin-bottom:20px;gap:5px}.breadcrumbs span{max-width:250px}.tool-meta{gap:12px;font-size:10px}.scope-banner{font-size:12px;padding:13px 15px}.panel-head{padding:19px 19px 15px}.panel-head h2{font-size:17px}.panel-head .step-tag{font-size:9px}.calc-form,.result-content{padding:20px 18px}.field-grid{gap:17px 12px}.field label{font-size:11px}.field input,.field select,.field textarea{font-size:16px;padding:10px;min-height:46px}.field select{font-size:13px}.field-help{font-size:10px}.form-note{font-size:11px}.form-actions .button{font-size:13px;padding:11px 14px}.input-panel,.result-panel{border-radius:14px}.result-empty{min-height:260px;padding:30px 20px}.answer-box{padding:19px}.answer-value{font-size:34px}.answer-value.long{font-size:22px}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.metrics .metric:last-child:nth-child(odd){grid-column:1/-1}.metric strong{font-size:14px}.result-section h3{font-size:14px}.learning-grid{grid-template-columns:1fr;gap:24px;margin-bottom:40px}.calc-grid{margin-bottom:36px}.article-body h2{font-size:24px}.article-body p{font-size:13px}.article-body h3{font-size:19px}.sidebar{display:grid;grid-template-columns:1fr;gap:15px}.side-box{margin:0}.directory-bar{padding:14px;gap:10px}.directory-bar select{width:175px;min-width:0;font-size:12px}.filter-faves{font-size:11px;padding:10px}.filter-faves .icon{width:16px;height:16px}.directory-count{font-size:10px}.directory{padding-bottom:40px}.content-page{padding-top:30px;padding-bottom:44px}.content-page h1{font-size:33px}.content-page .lede{font-size:16px;margin-bottom:26px}.content-page h2{font-size:23px}.content-page p,.content-page li{font-size:14px}.faq summary{font-size:13px}}
@media(max-width:360px){.hero-copy h1{font-size:44px}.tool-grid{grid-template-columns:1fr}.category-grid{grid-template-columns:1fr 1fr}.category-tile{padding:12px 9px}.category-tile .icon-box{display:none}.brand{font-size:18px}.field-grid{grid-template-columns:1fr}.metrics{grid-template-columns:1fr}.hero-search input{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{body{background:#fff;font-size:11px;color:#000}.site-header,.site-footer,.form-actions,.result-tools,.save-tool,.example-button,.menu-toggle,.sidebar,.bottom-cta,.directory,.toast,.keypad,.swap-units,.skip-link,.tool-meta,.result-empty,.source-list{display:none!important}.container,.narrow{width:100%;margin:0}.page-intro{padding:10px 0}.breadcrumbs{display:none}.tool-heading h1{font-size:24px}.calc-grid{display:block}.input-panel,.result-panel{box-shadow:none;border:1px solid #ddd;margin:12px 0}.result-content,.calc-form{padding:14px}.field-grid{grid-template-columns:repeat(3,1fr);gap:9px}.field-help,.input-foot,.form-note{display:none}.field input,.field textarea,.field select{padding:3px;border:0;min-height:20px;font-size:11px;resize:none;background:#fff}.field label{font-size:10px}.field textarea{height:auto;min-height:50px}.answer-box{background:#f4f4f4;border-color:#ddd;padding:12px}.answer-value{font-size:25px}.answer-label{color:#000}.plot-frame{break-inside:avoid;max-width:600px}.learning-grid{display:block;margin:20px 0}.article-body p{font-size:11px}.article-body h2{font-size:19px}.article-body .faq{display:none}.metrics{grid-template-columns:repeat(3,1fr)}.scope-banner{font-size:10px}.panel-head{padding:10px 14px}.data-table{font-size:9px}.table-wrap{overflow:visible}.data-table td,.data-table th{padding:4px 7px}.answer-value,.answer-subtitle{color:#000}.article-body{break-before:auto}a{color:#000}.show-rows{display:none}}