@charset "UTF-8";

:root[data-ci-theme="light"]{
  color-scheme:light;
  --page:#eaf2fc;--surface:#fff;--surface2:#f0f5ff;--ink:#0e2347;--muted:#506582;
  --line:#cddbf0;--field:#f5f8fe;--blue:#1265ef;--blue-deep:#0637a7;--red:#ec2f48;
  --hero:#f7faff;--hero2:#dbeaff;--hero-ink:#082452;--hero-muted:#46688e;
  --hero-stroke:#6d9bd13b;--hero-grid:#3980c31a;--hero-ring:#3778c64d;
  --panel:#fff;--panel-stroke:#bfd3ee;--nav:#f9fbff;--chip:#ffffffc9;
  --stripe:#ccddf2;--glow:#2e76e62c;--shadow:0 24px 55px #092b6430;
}
:root[data-ci-theme="dark"]{
  color-scheme:dark;
  --page:#071222;--surface:#102139;--surface2:#182d4b;--ink:#f5f9ff;--muted:#adc2da;
  --line:#365171;--field:#0c1c32;--blue:#7ab5ff;--blue-deep:#155fe8;--red:#ff5870;
  --hero:#081529;--hero2:#102b57;--hero-ink:#fff;--hero-muted:#c3d7ef;
  --hero-stroke:#ffffff3b;--hero-grid:#73b9ff18;--hero-ring:#7aaef74f;
  --panel:#0d203a;--panel-stroke:#405c7f;--nav:#0b1a2d;--chip:#1e3a5ca9;
  --stripe:#214167;--glow:#3276eb55;--shadow:0 27px 65px #0008;
}
*{box-sizing:border-box}
html{scroll-behavior:auto}
body{margin:0;color:var(--ink);background:var(--page);font-family:Inter,"Segoe UI",Arial,sans-serif;overflow-x:hidden;-webkit-font-smoothing:antialiased}
button,input,select{font:inherit}
button{cursor:pointer}
button,input,select{min-height:44px}
a{color:inherit}
:focus-visible{outline:3px solid #f83e5a;outline-offset:3px}
svg.icon{width:1.22em;height:1.22em;fill:none;stroke:currentColor;stroke-width:1.85;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.16em}
[hidden]{display:none!important}
.page{max-width:1500px;margin:auto;padding:0 30px}
.announcement{background:#08224c;color:#dbe9ff;padding:9px 20px;display:flex;align-items:center;justify-content:center;gap:10px;letter-spacing:.18em;text-align:center;text-transform:uppercase;font-size:.62rem;font-weight:700}
.pulse-dot{width:8px;height:8px;background:#ff4566;border-radius:50%;box-shadow:0 0 0 5px #ff45652c;flex:none;animation:ping 2.5s ease-in-out infinite}
@keyframes ping{50%{box-shadow:0 0 0 9px #ff456514}}
.header{display:flex;align-items:center;gap:27px;min-height:100px;justify-content:space-between}
.brand{display:flex;gap:11px;align-items:center;text-decoration:none;flex:none}
.brand-mark{background:#1260eb;width:56px;height:56px;border-radius:14px;display:grid;place-items:center;box-shadow:inset -8px -8px 0 #ef3251,0 9px 25px #145bf033}
.brand-mark svg{width:33px;height:33px;stroke:white;stroke-width:3.3;fill:none;stroke-linecap:round;stroke-linejoin:round}
.brand-word{font-weight:700;font-size:1.76rem;letter-spacing:-.079em;white-space:nowrap;line-height:.94}
.brand-word span{color:var(--red)}
.brand-word small{letter-spacing:-.02em;font-size:.47em}
.brand-sub{display:block;text-transform:uppercase;font-size:.52rem;letter-spacing:.24em;margin-top:8px;color:var(--muted);font-weight:700}
.site-nav{display:flex;gap:26px;align-items:center;justify-content:center;font-size:.84rem;font-weight:700}
.site-nav a{text-decoration:none;white-space:nowrap}
.site-nav a:hover{color:var(--red)}
.header-end{display:flex;align-items:center;gap:11px}
.mode-toggle{display:flex;gap:3px;padding:4px;border:1px solid var(--line);background:var(--surface);border-radius:14px}
.mode-toggle button{border:0;color:var(--muted);border-radius:10px;background:transparent;padding:9px 11px;font-size:.78rem;font-weight:700;display:flex;align-items:center;gap:6px;min-height:36px}
.mode-toggle button[aria-pressed="true"]{background:var(--ink);color:var(--surface)}
:root[data-ci-theme="dark"] .mode-toggle button[aria-pressed="true"]{background:#2876e7;color:white}
.nav-cta{background:var(--red);color:#fff;text-decoration:none;font-weight:700;font-size:.8rem;padding:15px 18px;border-radius:12px;white-space:nowrap;box-shadow:0 8px 20px #dc2e5138}
.nav-cta:hover{background:#bf1e3a}
.hero{position:relative;isolation:isolate;overflow:hidden;border-radius:30px;background:linear-gradient(120deg,var(--hero) 16%,var(--hero2) 100%);color:var(--hero-ink);box-shadow:var(--shadow);border:1px solid var(--hero-stroke)}
.hero::before{content:"";position:absolute;inset:0;z-index:-2;background-image:linear-gradient(var(--hero-grid) 1px,transparent 1px),linear-gradient(90deg,var(--hero-grid) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(100deg,transparent 0%,#000 65%)}
.hero::after{content:"";position:absolute;width:860px;height:860px;border:1px solid var(--hero-ring);border-radius:50%;right:-350px;top:-400px;z-index:-1;box-shadow:0 0 0 95px #4285e712,0 0 0 190px #4084df0d,0 0 0 290px #f0445b08}
.hero-red-rail{height:7px;background:repeating-linear-gradient(110deg,#e92846 0 100px,#fff 100px 128px,#165ee4 128px 235px,#fff 235px 255px)}
.hero-inner{position:relative;padding:42px 55px 0}
.hero-top{display:flex;align-items:center;justify-content:space-between;gap:14px}
.eyebrow{display:inline-flex;align-items:center;gap:11px;text-transform:uppercase;font-size:.69rem;font-weight:700;letter-spacing:.17em;color:var(--hero-ink);border:1px solid var(--hero-stroke);background:var(--chip);border-radius:100px;padding:11px 16px}
.eyebrow .signal{color:var(--red);font-size:1.25rem;line-height:0}
.hero-index{font-weight:700;letter-spacing:.18em;font-size:.62rem;text-transform:uppercase;color:var(--hero-muted)}
.hero-words{max-width:1060px;margin:18px 0 27px}
h1{font-size:clamp(3.6rem,7.4vw,7.45rem);font-weight:700;line-height:.91;letter-spacing:-.09em;margin:15px 0;max-width:12ch}
h1 em{font-style:normal;display:inline-block;color:var(--red);position:relative}
h1 em::after{content:"";position:absolute;height:10px;left:3%;right:2%;bottom:-14px;transform:skewX(-27deg);background:linear-gradient(90deg,#fa3553 0%,#1764eb 75%,transparent)}
.hero-lead{color:var(--hero-muted);font-size:1.02rem;line-height:1.58;font-weight:610;margin:26px 0 0;max-width:66ch}
.hero-workspace{display:grid;grid-template-columns:minmax(0,1.42fr) minmax(275px,.58fr);gap:20px;align-items:stretch;padding-bottom:34px}
.converter{min-width:0;position:relative;border-radius:23px;background:var(--panel);color:var(--ink);border:1px solid var(--panel-stroke);box-shadow:0 25px 55px #0a255b36;overflow:hidden}
.converter-topbar{background:#0a316b;color:#fff;padding:15px 22px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.converter-topbar .system-label{font-size:.66rem;letter-spacing:.16em;font-weight:700;text-transform:uppercase;color:#b5d7ff}
.converter-topbar strong{font-size:.78rem;font-weight:700;white-space:nowrap}
.head-light{width:7px;height:7px;background:#6ef0c2;box-shadow:0 0 0 4px #6ef0c231;border-radius:50%;display:inline-block;margin-right:7px}
.tabbar{display:flex;gap:5px;padding:8px;margin:13px 17px;background:var(--surface2);border-radius:13px;overflow-x:auto;scrollbar-width:thin}
.tabbar button{display:flex;align-items:center;justify-content:center;gap:7px;flex:1;border:0;background:transparent;color:var(--muted);font-size:.79rem;padding:12px 10px;border-radius:9px;font-weight:700;min-width:100px;white-space:nowrap}
.tabbar button[aria-selected="true"]{color:var(--ink);background:var(--surface);box-shadow:0 3px 13px #13397425}
.tabbar button[aria-selected="true"] svg{color:var(--red)}
.tab-panel{padding:5px 25px 23px}
.panel-label{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:0 0 13px}
.panel-label h2{font-size:1.17rem;letter-spacing:-.04em;margin:0;font-weight:700}
.panel-label span{color:var(--muted);font-size:.67rem;font-weight:740}
.fields{display:grid;gap:11px;margin-top:12px}
.fields.three{grid-template-columns:1fr 1fr 1fr}
.fields.two{grid-template-columns:1fr 1fr}
.fields label{display:flex;flex-direction:column;min-width:0;gap:7px;font-weight:700;font-size:.69rem;text-transform:uppercase;letter-spacing:.055em}
.fields input,.fields select,.search-field input{width:100%;min-width:0;background:var(--field);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:11px 12px;outline-color:var(--blue);font-size:.91rem;letter-spacing:0;text-transform:none;font-weight:680}
.unit-inputs{display:grid;grid-template-columns:1fr 1fr 40px 1fr;gap:10px;align-items:end}
.unit-inputs label{display:flex;flex-direction:column;min-width:0;gap:7px;font-weight:700;font-size:.69rem;text-transform:uppercase;letter-spacing:.055em}
.unit-inputs input,.unit-inputs select{width:100%;min-width:0;min-height:53px;background:var(--field);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:10px;font-size:.97rem;font-weight:700;text-transform:none;letter-spacing:0}
.swap-btn{height:53px;min-height:53px;padding:0;border:1px solid var(--line);background:var(--surface2);color:var(--blue);border-radius:10px;font-size:1.3rem;font-weight:700}
.swap-btn:hover{transform:rotate(180deg);transition:transform .25s}
.result-zone{position:relative;isolation:isolate;background:linear-gradient(117deg,#105ce5,#0d3fa4 60%,#092a72);color:#fff;margin-top:16px;padding:20px 22px 17px;border-radius:14px;overflow:hidden}
.result-zone::after{content:"↗";position:absolute;right:-12px;top:-50px;font-weight:700;font-size:11rem;opacity:.095;z-index:-1}
.result-kicker{font-size:.65rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:#bfdbff;display:flex;align-items:center;gap:9px}
.result-number{font-weight:700;font-size:clamp(2.5rem,4.15vw,4.2rem);letter-spacing:-.075em;line-height:1.1;margin:9px 0 3px;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.result-unit{font-size:.96rem;font-weight:760;color:#e2efff}
.result-note{margin:10px 0 0;padding-top:11px;border-top:1px solid #ffffff3c;font-size:.72rem;color:#c6dbfb;line-height:1.5}
.try-row{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin:17px 0 0}
.try-row .try-label{color:var(--muted);font-size:.65rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-right:3px}
.try-row button{background:var(--surface2);color:var(--ink);border:1px solid var(--line);padding:8px 10px;border-radius:9px;min-height:34px;font-weight:700;font-size:.69rem}
.try-row button:hover,.chip-actions button:hover{border-color:var(--blue);color:var(--blue)}
.converter-foot{padding:12px 25px;background:var(--surface2);border-top:1px solid var(--line);display:flex;gap:12px;align-items:center;justify-content:space-between}
.converter-foot small{color:var(--muted);font-size:.65rem;line-height:1.5}
.converter-foot a{color:var(--blue);font-size:.7rem;font-weight:700;white-space:nowrap;text-decoration:none}
.hero-side{display:flex;flex-direction:column;gap:15px;min-width:0}
.side-illustration{background:linear-gradient(142deg,#061c49 8%,#103e94 63%,#ec2f4e 180%);border-radius:21px;position:relative;overflow:hidden;min-height:260px;flex:1;border:1px solid #7bb3ff55;display:flex;flex-direction:column;align-items:center;justify-content:center;color:white;isolation:isolate}
.side-illustration::before{content:"";position:absolute;width:350px;height:350px;border:1px dashed #88caff65;border-radius:50%;box-shadow:0 0 0 30px #4fa4ff0b,0 0 0 70px #4fa4ff10,0 0 0 125px #4fa4ff0b;transform:rotate(-20deg);z-index:-1;animation:orbit 36s linear infinite}
.side-illustration::after{content:"";position:absolute;inset:0;background:linear-gradient(125deg,transparent 30%,#ffffff18 52%,transparent 55%);background-size:250% 100%;animation:sweep 8s ease-in-out infinite;pointer-events:none}
@keyframes orbit{to{transform:rotate(340deg)}}
@keyframes sweep{0%,32%{background-position:100% 0}85%,100%{background-position:-100% 0}}
.orbit-art{width:206px;height:206px;position:relative;display:grid;place-items:center}
.orbit-art .circle1{width:181px;height:181px;border:2px solid #d9edff7b;border-radius:50%;box-shadow:inset 0 0 45px #59affb24,0 0 0 17px #ffffff0a;display:grid;place-items:center}
.orbit-art .circle2{height:116px;width:116px;border:9px solid #fff;border-left-color:#ff4568;border-bottom-color:#ff4568;border-right-color:#2f80ed;border-radius:50%;box-shadow:0 0 30px #fc415b8c;transform:rotate(-25deg);display:grid;place-items:center}
.orbit-art .circle2 svg{width:57px;height:57px;stroke:#fff;stroke-width:4;fill:none}
.orbit-art .spark{position:absolute;display:grid;place-items:center;background:#f83050;border:2px solid #fff;border-radius:50%;font-weight:700;box-shadow:0 6px 20px #ff425e7a}
.orbit-art .s1{top:9px;right:2px;width:43px;height:43px;font-size:1.2rem}
.orbit-art .s2{bottom:14px;left:-3px;width:36px;height:36px;background:#0a65e8}
.art-overline{letter-spacing:.26em;text-transform:uppercase;font-size:.61rem;font-weight:700;color:#bedbff;margin-top:-2px}
.art-title{font-weight:700;letter-spacing:-.045em;font-size:1.55rem;margin-top:7px}
.art-sub{color:#c8e0ff;font-size:.71rem;margin-top:6px}
.side-explore{padding:22px;border-radius:18px;background:var(--chip);border:1px solid var(--hero-stroke);backdrop-filter:blur(10px)}
.side-explore .overline{font-size:.67rem;color:var(--hero-muted);font-weight:700;letter-spacing:.13em;text-transform:uppercase}
.side-explore h3{font-size:1.27rem;margin:6px 0 15px;line-height:1.13;letter-spacing:-.04em}
.side-link{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-top:1px solid var(--hero-stroke);width:100%;background:transparent;border-left:0;border-right:0;border-bottom:0;text-align:left;color:var(--hero-ink);font-size:.78rem;font-weight:700}
.side-link .arrow{background:var(--red);color:white;padding:3px 7px;border-radius:8px;font-size:.82rem}
.ticker{display:flex;gap:0;background:#092653;color:white;overflow:hidden;border-top:1px solid #5b8ce755}
.ticker span{padding:16px 22px;white-space:nowrap;border-right:1px solid #ffffff30;font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.19em;display:flex;align-items:center;gap:12px}
.ticker span::before{content:"◆";color:#fa4c67;font-size:.54rem}
.ticker span:nth-child(even)::before{color:#7ad8ff}
.under-hero{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin:21px 0 82px}
.under-card{display:flex;align-items:center;gap:13px;padding:17px 18px;border:1px solid var(--line);border-radius:17px;background:var(--surface);box-shadow:0 8px 24px #143d7e0e;text-align:left;transition:transform .2s}
.under-card:hover{transform:translateY(-4px)}
.under-card .under-icon{width:43px;height:43px;flex:none;background:var(--surface2);color:var(--blue);border-radius:13px;display:grid;place-items:center;font-size:1.25rem}
.under-card:nth-child(2) .under-icon{color:var(--red)}
.under-card strong{font-size:.84rem;display:block;font-weight:700}
.under-card small{font-size:.66rem;color:var(--muted);line-height:1.5}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:27px}
.eyeline{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.19em;color:var(--red)}
.section-heading h2{font-size:clamp(2.4rem,4.5vw,4.5rem);font-weight:700;letter-spacing:-.077em;line-height:1;margin:9px 0}
.section-heading h2 span{color:var(--blue)}
.section-heading p{color:var(--muted);line-height:1.6;font-size:.91rem;max-width:61ch;margin:10px 0 0}
.search-field{display:flex;align-items:center;gap:11px;background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:0 15px;min-width:245px}
.search-field svg{color:var(--red)}
.search-field input{border:0;padding:9px 0;outline:none;background:transparent}
.search-field input:focus-visible{outline:0}
.search-field:focus-within{outline:3px solid var(--blue);outline-offset:2px}
.tool-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:16px;margin-bottom:23px}
.tool-card{grid-column:span 3;position:relative;overflow:hidden;display:flex;flex-direction:column;gap:10px;min-height:225px;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:21px;box-shadow:0 4px 17px #122d580a;transition:transform .2s,box-shadow .2s}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.tool-card.big{grid-column:span 6;min-height:248px}
.tool-card.tall{grid-column:span 3}
.tool-card.color-red{background:linear-gradient(135deg,#e52243,#f24a5d);color:white;border-color:#f36878}
.tool-card.color-blue{background:linear-gradient(140deg,#0d5de1,#0d91e7);color:white;border-color:#2d93ed}
.tool-card.color-navy{background:linear-gradient(125deg,#10327d,#0d224e);color:white;border-color:#3159a6}
.tool-card.math-card{background:radial-gradient(circle at 88% 22%,#ed3b5530,transparent 37%),linear-gradient(125deg,var(--surface),var(--surface2))}
.tool-card .tool-icon{background:var(--surface2);color:var(--blue);width:43px;height:43px;display:grid;place-items:center;border-radius:12px;font-size:1.25rem}
.tool-card.color-red .tool-icon,.tool-card.color-blue .tool-icon,.tool-card.color-navy .tool-icon{background:#ffffff2b;color:white}
.tool-card .number{position:absolute;right:19px;top:17px;font-size:.68rem;font-weight:700;opacity:.55;letter-spacing:.12em}
.tool-card h3{font-size:1.42rem;letter-spacing:-.048em;line-height:1.1;font-weight:700;margin:4px 0 0}
.tool-card p{color:var(--muted);line-height:1.52;font-size:.82rem;margin:0}
.tool-card.color-red p,.tool-card.color-blue p,.tool-card.color-navy p{color:#e8f2ff}
.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:auto}
.card-bottom button{padding:9px 13px;border-radius:9px;border:1px solid currentColor;color:inherit;background:transparent;font-size:.76rem;font-weight:700;white-space:nowrap;min-height:36px}
.card-bottom button:hover{background:#ffffff22}
.card-bottom small{font-size:.7rem;font-weight:700;opacity:.85}
.mini-numbers{font-size:clamp(1.45rem,2.4vw,2.4rem);font-weight:700;letter-spacing:-.06em;margin:10px 0}
.math-mark{color:var(--blue);font-size:clamp(1.6rem,3vw,2.7rem);font-weight:700;letter-spacing:-.07em;margin:10px 0}
.math-mark span{color:var(--red)}
.tool-card .ghost{font-size:10rem;font-weight:700;line-height:1;position:absolute;right:-27px;bottom:-33px;opacity:.1;pointer-events:none}
.world-time-row{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:5px 0;font-size:.72rem;gap:8px}
.world-time-row strong{font-size:.93rem;font-variant-numeric:tabular-nums}
.tool-card.color-navy .world-time-row{border-color:#ffffff40}
.handbook-mini{display:flex;align-items:center;gap:16px;margin:9px 0}
.book-cover{width:87px;height:119px;background:#fff2d8;box-shadow:inset 9px 0 0 #ed2f48,7px 8px 0 #0002;color:#0d2651;border-radius:4px;padding:15px 8px 11px 17px;display:flex;flex-direction:column;justify-content:space-between;flex:none;font-family:Georgia,serif}
.book-cover strong{font-size:.68rem;line-height:1.04}
.book-cover small{font-size:.5rem}
.card-info{display:none;border:1px solid var(--line);background:var(--surface2);border-radius:16px;padding:22px;margin-bottom:64px}
.card-info.is-open{display:block}
.card-info h3{margin:0 0 7px;letter-spacing:-.045em;font-size:1.35rem}
.card-info p{font-size:.85rem;color:var(--muted);line-height:1.6;max-width:90ch}
.card-info .close-info{background:var(--red);color:white;border:0;padding:9px 15px;border-radius:9px;font-size:.78rem;font-weight:700}
.chip-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip-actions button{background:var(--surface);border:1px solid var(--line);color:var(--ink);font-weight:700;border-radius:99px;padding:9px 14px;min-height:37px;font-size:.75rem}
.search-empty{display:none;color:var(--muted);background:var(--surface);border:1px solid var(--line);padding:25px;border-radius:15px}
.challenge{display:grid;grid-template-columns:.75fr 1.25fr;gap:30px;align-items:center;margin:22px 0 75px;padding:36px 39px;border-radius:23px;background:linear-gradient(115deg,#0a2d71,#0b54c7 70%,#e62b50 160%);color:white;overflow:hidden;position:relative}
.challenge::after{content:"GO";position:absolute;right:-10px;bottom:-67px;font-size:16rem;font-weight:700;letter-spacing:-.12em;color:#ffffff0b;pointer-events:none}
.challenge .eyeline{color:#9bdfff}
.challenge h2{font-size:clamp(2rem,3.3vw,3.2rem);letter-spacing:-.07em;line-height:1.02;margin:11px 0}
.challenge p{font-size:.85rem;line-height:1.55;color:#cce2ff}
.scenario-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px;position:relative}
.scenario{background:#ffffff14;color:white;min-height:88px;border:1px solid #ffffff5b;border-radius:13px;padding:16px;display:flex;flex-direction:column;align-items:start;justify-content:center;text-align:left;gap:8px}
.scenario:hover{background:#ffffff2d;transform:translateY(-2px)}
.scenario strong{font-size:1rem;font-weight:700}
.scenario span{font-size:.68rem;color:#cfe5ff}
.bottom-band{display:grid;grid-template-columns:1fr 1fr;gap:24px;padding:35px 0 62px;border-top:1px solid var(--line)}
.bottom-band h2{font-size:1.58rem;letter-spacing:-.05em;margin:0 0 9px}
.bottom-band p{font-size:.85rem;line-height:1.62;color:var(--muted);max-width:60ch;margin:0 0 13px}
.bottom-band details{font-size:.8rem;border:1px solid var(--line);background:var(--surface);padding:12px 15px;border-radius:11px;margin:8px 0}
.bottom-band summary{cursor:pointer;font-weight:700}
.footer{background:#092550;color:#d5e9ff}
.footer-inner{max-width:1500px;margin:auto;padding:24px 30px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:.73rem;line-height:1.5}
.footer strong{color:white}
@media(max-width:1180px){
  .site-nav{gap:15px;font-size:.77rem}
  .hero-inner{padding:35px 32px 0}
  .hero-workspace{grid-template-columns:minmax(0,1.35fr) minmax(250px,.65fr)}
  .tool-card{grid-column:span 4}
  .tool-card.big{grid-column:span 6}
  .under-hero{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:930px){
  .site-nav{order:3;flex:1 0 100%;justify-content:space-between;padding-bottom:13px;border-bottom:1px solid var(--line)}
  .header{flex-wrap:wrap;min-height:0;padding:17px 0 10px}
  .header-end{margin-left:auto}
  .hero-workspace{grid-template-columns:1fr}
  .hero-side{display:grid;grid-template-columns:1fr 1fr}
  .side-illustration{min-height:230px}
  h1{font-size:clamp(3.5rem,9vw,6.25rem)}
  .tool-card{grid-column:span 6}
  .tool-card.big{grid-column:span 6}
}
@media(max-width:670px){
  .page{padding:0 14px}
  .announcement{font-size:.55rem;letter-spacing:.08em}
  .header{gap:10px}
  .brand-mark{width:43px;height:43px;border-radius:11px}
  .brand-mark svg{width:29px;height:29px}
  .brand-word{font-size:1.37rem}
  .brand-sub{font-size:.41rem}
  .mode-toggle button{font-size:.72rem;padding:9px}
  .mode-toggle button svg{display:none}
  .nav-cta{display:none}
  .site-nav{gap:17px;overflow-x:auto;scrollbar-width:none;justify-content:flex-start;white-space:nowrap;font-size:.76rem;scroll-snap-type:x proximity}
  .site-nav::-webkit-scrollbar{display:none}
  .site-nav a{scroll-snap-align:start}
  .hero{border-radius:19px}
  .hero-inner{padding:25px 16px 0}
  .hero-index{display:none}
  .eyebrow{padding:10px 12px;font-size:.58rem;letter-spacing:.09em}
  h1{font-size:clamp(3.17rem,13.6vw,5.4rem);margin:21px 0 17px}
  h1 em::after{height:6px;bottom:-8px}
  .hero-lead{font-size:.85rem;margin-top:23px;line-height:1.48}
  .hero-words{margin-bottom:20px}
  .converter-topbar{padding:13px 15px}
  .converter-topbar strong{font-size:.66rem}
  .converter-topbar .system-label{font-size:.55rem;letter-spacing:.08em}
  .tabbar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));overflow:visible;margin:10px 10px 11px;padding:4px;gap:4px}
  .tabbar button{width:100%;min-width:0;flex:none;font-size:.74rem;padding:9px 6px}
  .tab-panel{padding:4px 14px 18px}
  .panel-label h2{font-size:1rem}
  .panel-label span{font-size:.58rem}
  .unit-inputs{grid-template-columns:1fr 40px 1fr}
  .unit-inputs label:first-child{grid-column:span 3}
  .fields.three{grid-template-columns:1fr 1fr}
  .fields.three label:first-child{grid-column:span 2}
  .result-zone{padding:19px}
  .result-number{font-size:clamp(2.2rem,9vw,3.1rem)}
  .converter-foot{padding:12px 14px}
  .hero-side{display:grid;grid-template-columns:1fr}
  .side-illustration{min-height:185px;flex-direction:row;gap:5px;justify-content:space-around;padding:7px 12px}
  .orbit-art{transform:scale(.73);margin:-25px;width:160px;flex:none}
  .side-illustration .art-overline,.side-illustration .art-sub{display:none}
  .side-illustration .art-title{font-size:1.13rem}
  .side-explore{padding:17px}
  .ticker{overflow-x:auto;scrollbar-width:none}
  .ticker span{font-size:.57rem;padding:14px 17px;letter-spacing:.1em}
  .under-hero{grid-template-columns:1fr 1fr;gap:8px;margin:13px 0 52px}
  .under-card{flex-direction:column;align-items:start;gap:9px;padding:12px;min-height:114px}
  .under-card .under-icon{width:36px;height:36px}
  .under-card strong{font-size:.73rem}
  .under-card small{font-size:.63rem}
  .section-heading{align-items:stretch;flex-direction:column;gap:16px}
  .section-heading h2{font-size:2.65rem}
  .tool-grid{gap:11px}
  .tool-card,.tool-card.big,.tool-card.tall{grid-column:span 12;min-height:194px;padding:22px}
  .challenge{grid-template-columns:1fr;padding:27px 20px;margin:12px 0 55px;gap:18px}
  .scenario-grid{gap:8px}
  .scenario{padding:12px;min-height:88px}
  .scenario strong{font-size:.84rem}
  .bottom-band{grid-template-columns:1fr}
}
@media(max-width:365px){
  .brand-word{font-size:1.2rem}
  .brand-mark{width:38px;height:38px}
  .mode-toggle button{font-size:.64rem;padding:7px}
  .hero-inner{padding:20px 11px 0}
  h1{font-size:clamp(2.45rem,11.8vw,3rem)}
  .unit-inputs{gap:6px}
  .unit-inputs select{font-size:.85rem;padding:8px 6px}
  .panel-label span{display:none}
  .result-unit{font-size:.85rem}
  .scenario-grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
/* V6: converter first; retained V5 discovery below. */
body{overflow-x:visible}
.page{max-width:1440px;padding:0 28px}
.header{min-height:86px;gap:18px}
.hero{overflow:visible;border-radius:24px}
.hero::before,.hero::after{display:none}
.hero-red-rail{border-radius:24px 24px 0 0}
.hero-inner{padding:20px 25px 0}
.hero-top{display:none}
.hero-words{display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:none;margin:0 0 18px}
h1{font-size:clamp(1.8rem,3.2vw,3rem);letter-spacing:-.065em;line-height:1.03;max-width:none;margin:0}
h1 br{display:none}h1 em{display:inline}h1 em::after{display:none}
.hero-lead{font-size:.85rem;line-height:1.5;margin:0;max-width:47ch}
.hero-workspace{display:block;padding-bottom:22px}
.converter{border:1px solid var(--panel-stroke);border-top:4px solid #1768f2;box-shadow:0 14px 36px #0a255b26;overflow:visible}
.converter-topbar{border-radius:18px 18px 0 0;padding:10px 21px}
.tabbar{margin:10px 18px;padding:4px}
.tabbar button{min-height:40px;padding:8px 14px}
.tab-panel{padding:4px 22px 18px}
.converter-foot{border-radius:0 0 20px 20px;padding:10px 22px}
.smart-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:0 25px;align-items:stretch}
.smart-entry{grid-column:1;grid-row:1;min-width:0}
.smart-title{display:flex;align-items:center;gap:9px;font-size:1.25rem;font-weight:700;letter-spacing:-.035em;margin-bottom:9px}
.smart-title span{background:#ec2f48;color:#fff;font-size:.6rem;letter-spacing:.08em;text-transform:uppercase;border-radius:6px;padding:5px 7px}
.smart-hint{font-size:.76rem;color:var(--muted);margin:8px 0 0;line-height:1.5}
.smart-box{position:relative;z-index:4}
#smart-input{width:100%;min-width:0;min-height:61px;padding:13px 44px 13px 16px;font-size:1.18rem;font-weight:750;letter-spacing:-.025em;border:2px solid #377fe6;border-radius:12px;background:var(--field);color:var(--ink);box-shadow:0 0 0 4px #236ce815}
#smart-input::placeholder{color:var(--muted);opacity:1}
.smart-box::after{content:'↗';position:absolute;right:17px;top:15px;color:var(--blue);font-size:1.5rem;pointer-events:none}
.smart-suggestions{list-style:none;margin:6px 0 0;padding:5px;position:absolute;left:0;right:0;top:100%;background:var(--surface);border:1px solid #527aaa;border-radius:12px;box-shadow:0 14px 35px #071c4640;max-height:280px;overflow:auto;overscroll-behavior:contain}
.smart-suggestions li{display:flex;gap:12px;align-items:center;justify-content:space-between;min-height:48px;border-radius:8px;padding:10px 12px;cursor:pointer;font-size:.9rem}
.smart-suggestions li[aria-selected="true"],.smart-suggestions li:hover{background:var(--surface2);outline:2px solid var(--blue);outline-offset:-2px}
.smart-suggestions small{font-size:.69rem;color:var(--muted);text-align:right}
.smart-message{margin:8px 0 0;font-size:.76rem;line-height:1.45;color:var(--muted);min-height:2.1em}
.smart-message[data-state="error"]{color:#ad1835}:root[data-ci-theme="dark"] .smart-message[data-state="error"]{color:#ff9bae}
.advanced-units{grid-column:1;grid-row:2;margin-top:7px;min-width:0}
.advanced-units summary{cursor:pointer;color:var(--blue);font-size:.77rem;font-weight:700;min-height:35px;line-height:35px}
.advanced-units .fields{margin:6px 0 10px}
.advanced-units .unit-inputs{grid-template-columns:minmax(0,.8fr) minmax(0,1fr) 40px minmax(0,1fr);gap:8px}
.advanced-units :is(input,select){min-height:46px;padding:8px;font-size:.84rem}
.advanced-units .swap-btn{height:46px;min-height:46px}
.smart-result{grid-column:2;grid-row:1 / span 2;display:flex;flex-direction:column;justify-content:center;margin:0;border:1px solid #3a86ff;box-shadow:inset 0 1px 0 #ffffff38,0 10px 22px #0751d333;padding:24px 28px;min-height:245px}
.smart-result .result-number{font-size:clamp(3.2rem,5.5vw,5.25rem);margin:12px 0 4px;line-height:1.05;letter-spacing:-.065em}
.smart-result .result-unit{font-size:1.18rem}
.smart-result .result-note{font-size:.8rem;line-height:1.5}
.smart-result .result-number[data-long="true"]{font-size:clamp(2.1rem,4.2vw,4rem)}
#panel-units>.try-row{margin-top:12px}
.try-row button{min-height:44px}
.ticker{border-radius:0 0 24px 24px;flex-wrap:wrap}
.ticker span{font-size:.56rem;padding:11px 18px;flex:1;justify-content:center}
.v6-beyond{display:grid;grid-template-columns:.8fr 1.2fr;gap:18px;margin:0 0 50px}
.v6-beyond .side-illustration{min-height:220px;flex-direction:row;gap:14px;padding:20px}
.v6-beyond .orbit-art{transform:scale(.75);width:155px;height:170px;margin:-10px;flex:none}
.v6-beyond .side-explore{padding:18px 25px;background:var(--surface);border-color:var(--line);color:var(--ink)}
.v6-beyond .side-link{color:var(--ink);border-color:var(--line)}
.v6-beyond .overline{color:var(--muted)}
.under-hero{margin:18px 0 22px}
.tabbar button:focus-visible{outline-offset:-2px}
@media(max-width:1100px){.header{flex-wrap:wrap;padding:14px 0 10px}.site-nav{order:3;flex:1 0 100%;justify-content:space-between;padding-bottom:8px}.header-end{margin-left:auto}.v6-beyond{grid-template-columns:1fr 1fr}.v6-beyond .side-illustration{flex-direction:column}.hero-words{align-items:start}.hero-lead{max-width:35ch}}
@media(max-width:800px){.smart-layout{grid-template-columns:1fr}.smart-entry{grid-row:1}.smart-result{grid-column:1;grid-row:2;margin-top:8px;min-height:190px}.advanced-units{grid-row:3}.hero-words{display:block}.hero-lead{max-width:none;margin-top:8px}.smart-result .result-number{font-size:3.8rem}.v6-beyond{grid-template-columns:1fr 1fr}}
@media(max-width:670px){.page{padding:0 12px}.header{gap:12px}.site-nav{flex-wrap:wrap;gap:4px 17px;overflow:visible;padding:0 0 8px}.site-nav a{min-height:40px;display:flex;align-items:center}.hero-inner{padding:16px 10px 0}.hero-words{margin-bottom:16px}h1{font-size:1.95rem;margin:0}.hero-lead{font-size:.8rem;margin-top:7px}.hero-red-rail{height:5px}.converter-topbar{padding:10px 13px}.converter-topbar strong{display:none}.tabbar{grid-template-columns:repeat(4,minmax(0,1fr));margin:8px;padding:3px;gap:3px}.tabbar button{font-size:.72rem;padding:8px 3px;min-height:44px}.tabbar button svg{display:none}.tab-panel{padding:4px 13px 16px}.smart-title{font-size:1.14rem}#smart-input{font-size:1.04rem;padding-left:12px;min-height:57px}.smart-result{padding:21px 18px;min-height:195px}.smart-result .result-number{font-size:3.7rem}.smart-result .result-unit{font-size:1.05rem}.smart-result .result-note{font-size:.75rem}.smart-hint{font-size:.73rem}.smart-message{font-size:.73rem;min-height:0;margin-bottom:4px}.advanced-units .unit-inputs{grid-template-columns:1fr 40px 1fr}.advanced-units .unit-inputs label:first-child{grid-column:span 3}.advanced-units .fields select{min-height:48px}.advanced-units .unit-inputs :is(input,select){min-height:48px;font-size:.85rem}.advanced-units .swap-btn{height:48px}.try-row{gap:6px}.try-row button{min-height:44px;padding:8px;font-size:.66rem}.try-row .try-label{width:100%}.converter-foot{align-items:start;flex-direction:column;padding:11px 13px}.ticker{display:none}.hero-workspace{padding-bottom:12px}.hero{border-radius:18px}.v6-beyond{grid-template-columns:1fr;margin-bottom:40px}.v6-beyond .side-illustration{flex-direction:row;min-height:180px}.smart-suggestions small{font-size:.65rem}.smart-suggestions li{gap:8px;padding:10px 8px}.mode-toggle button{min-height:44px}.header-end{margin-left:auto}.search-field{min-width:0}.card-bottom{flex-wrap:wrap}.fields.two{grid-template-columns:1fr}.fields input[type=date]{max-width:100%;min-width:0}}
@media(max-width:365px){.page{padding:0 8px}.header{gap:7px}.brand{gap:7px}.brand-word{font-size:1.14rem}.brand-sub{font-size:.35rem;letter-spacing:.15em}.brand-mark{width:35px;height:39px}.header-end{margin-left:0}.mode-toggle{gap:0;padding:2px}.mode-toggle button{padding:6px;font-size:.67rem}.hero-inner{padding:14px 7px 0}h1{font-size:1.68rem}.tab-panel{padding:4px 10px 14px}.smart-title span{font-size:.53rem}.smart-result .result-number{font-size:3.2rem}.converter-topbar .system-label{font-size:.53rem}.section-heading h2{font-size:2.25rem}.handbook-mini{align-items:start;gap:12px}.v6-beyond .side-illustration{padding:12px}.art-title{font-size:1.1rem}}


/* V6.1 content and mobile navigation polish. */
.bottom-band{display:block;max-width:1000px;margin:0 auto}
.bottom-band h2{margin-bottom:18px}
.bottom-band p{max-width:90ch;margin:12px 0 2px}
.bottom-band details{font-size:.88rem;padding:16px 18px}
.bottom-band summary{min-height:24px;line-height:1.5}
@media(max-width:670px){
 .header{row-gap:13px}
 .site-nav{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;white-space:normal;overflow:visible;justify-content:normal;padding:0 0 12px}
 .site-nav a{grid-column:span 2;display:flex;align-items:center;justify-content:center;min-height:44px;padding:8px 3px;text-align:center;font-size:.73rem;line-height:1.2;border:1px solid var(--line);background:var(--surface);border-radius:9px}
 .site-nav a:nth-child(4){grid-column:2 / span 2}
 .site-nav a:nth-child(5){grid-column:4 / span 2}
 .site-nav a:hover{background:var(--surface2)}
 .announcement{font-size:.52rem;letter-spacing:.07em;line-height:1.5;padding:7px 10px;gap:7px}
 .bottom-band{padding:28px 0 40px}
 .bottom-band details{padding:14px}
}


/* V6.2: system font metrics, comfortable wrapping, a single full-card action. */
body,input,select,button,textarea{font-family:Arial,Helvetica,sans-serif}
h1,h2,h3,strong,b,.brand-word,.tool-card h3{font-weight:700}
button,.number,.mini-numbers,.result-number,.book-cover strong{font-weight:700}
h1,h2,h3,p,button,a,label{overflow-wrap:anywhere}
.tool-card{min-width:0;isolation:isolate;cursor:pointer}
.tool-card h3{letter-spacing:-.025em;line-height:1.2}
.card-bottom button{white-space:normal;min-height:44px;font-weight:700}
.card-bottom button::after{content:"";position:absolute;inset:0;border-radius:inherit;z-index:2}
.tool-card:focus-within{outline:3px solid var(--blue);outline-offset:4px}
.color-blue:focus-within,.color-red:focus-within,.color-navy:focus-within{outline-color:var(--red)}
.handbook-mini{display:grid;grid-template-columns:106px minmax(0,1fr);gap:18px;align-items:start}
.book-cover{box-sizing:border-box;width:106px;min-width:0;min-height:150px;height:auto;padding:14px 10px;display:flex;flex-direction:column;gap:14px;justify-content:space-between;overflow-wrap:anywhere}
.book-cover strong{font-family:Arial,Helvetica,sans-serif;font-size:.58rem;line-height:1.4;letter-spacing:0;display:block}
.book-cover small{font-size:.5rem;line-height:1.5;letter-spacing:.02em;white-space:normal}
.discovery-controls{display:flex;align-items:center;gap:15px;flex-wrap:wrap;margin-bottom:20px}
.discovery-controls p{font-size:.85rem;color:var(--muted)}
.discovery-controls button,dialog button,dialog a{min-height:44px;padding:10px 14px;border:1px solid var(--line);border-radius:9px;background:var(--surface2);color:var(--ink);font-size:1rem;line-height:1.4;cursor:pointer}
dialog{box-sizing:border-box;width:min(960px,calc(100% - 24px));max-height:calc(100dvh - 24px);padding:0;border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);overflow:auto;overscroll-behavior:contain}
dialog::backdrop{background:#020817bb}
.destination-header{position:sticky;top:0;z-index:3;display:flex;align-items:start;justify-content:space-between;gap:16px;padding:20px;background:var(--surface2);border-bottom:1px solid var(--line)}
.destination-header h2{font-size:1.6rem;line-height:1.25;letter-spacing:-.02em;margin:0}
.destination-header button{flex-shrink:0}
#destination-body{padding:20px;line-height:1.6}
#destination-body p{font-size:1rem}#destination-body h3{font-size:1.2rem;margin-top:28px}
#destination-body label{display:block;margin:12px 0 5px;font-weight:700}
#destination-body input,#destination-body select{box-sizing:border-box;max-width:100%;width:100%;min-height:48px;padding:10px;font-size:1rem;border:1px solid var(--line);border-radius:8px;background:var(--field);color:var(--ink)}
#destination-body code{white-space:normal;overflow-wrap:anywhere}
#destination-body li{margin-bottom:18px}#destination-body dt{font-weight:bold}#destination-body dd{margin:0 0 16px}
.destination-actions{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.destination-actions a{display:inline-flex;align-items:center}
.zone-result{padding:18px;background:var(--surface2);border:1px solid var(--line);border-radius:12px;font-variant-numeric:tabular-nums}
.book-scan{display:block;max-width:100%;height:auto;background:#fff;margin:20px auto;border:1px solid var(--line)}
@media(max-width:670px){.handbook-mini{grid-template-columns:96px minmax(0,1fr);gap:14px}.book-cover{width:96px}.destination-header{padding:15px;gap:9px}.destination-header h2{font-size:1.25rem}#destination-body{padding:15px}.tool-card .number{font-size:.62rem}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

.ci-site{max-width:1440px;margin:auto}.ci-header{border-bottom:1px solid var(--line)}.ci-main{padding:0}.ci-legacy-content{background:transparent!important;padding:0!important;overflow:visible}.ci-ad-wrap{max-width:100%}.ci-home-v63 .card-bottom a{padding:12px 18px;border:1px solid currentColor;border-radius:12px;color:inherit;text-decoration:none}.ci-home-v63 .card-bottom a::after{content:"";position:absolute;inset:0;z-index:1}.ci-home-v63 .tool-card{position:relative;isolation:isolate}.ci-home-v63 .tool-card:focus-within{outline:3px solid #f42b54;outline-offset:4px}.ci-home-v63 .tabbar a{text-align:center;padding:16px;color:var(--text);text-decoration:none;border-radius:12px}.ci-home-v63 .tabbar a:first-child{background:var(--surface)}.ci-home-v63 .smart-input-wrap{position:relative}.ci-home-v63 #ci-smart{width:100%;min-height:58px;font-size:1.15rem}.ci-home-v63 .ci-smart-fields{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}.ci-home-v63 label{display:block}.ci-home-v63 input,.ci-home-v63 select{max-width:100%;color:var(--text);background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px}.ci-home-v63 .smart-result{min-width:0}.ci-home-v63 #ci-live-answer{font:700 clamp(1.4rem,4vw,3rem)/1.3 Arial;white-space:pre-wrap;overflow-wrap:anywhere;color:white}.ci-home-v63 .smart-result a{color:white}.ci-home-v63 button{min-height:44px}.ci-home-v63 .smart-options{position:absolute;z-index:3;background:var(--surface);border:1px solid var(--line);padding:8px;list-style:none;max-height:240px;overflow:auto;width:100%}.ci-home-v63 .smart-options li{padding:12px;cursor:pointer}.ci-home-v63 .smart-options li[aria-selected=true]{background:var(--soft);outline:2px solid var(--blue)}.ci-home-v63 .home-search{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.ci-home-v63 .home-search input{flex:1}.ci-home-v63 .home-search button{padding:12px;background:var(--blue);color:#fff;border:0;border-radius:12px}@media(max-width:670px){.ci-home-v63 .ci-smart-fields{grid-template-columns:1fr}.ci-home-v63 .tabbar a{font-size:.8rem;padding:14px 3px}.ci-site{padding:0 10px}.ci-header{padding:16px 0}.ci-nav{justify-content:center;gap:8px;flex-wrap:wrap}.ci-nav a{min-height:44px;padding:8px}.ci-main{padding:0}}
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.ci-home-v63 .smart-result{background:linear-gradient(120deg,#075fe8,#113d90);border-radius:16px}.ci-home-v63 .ci-smart-fields label{display:flex;flex-direction:column;align-items:stretch;gap:8px}.ci-home-v63 .ci-smart-fields input{width:100%}.ci-home-v63 .tabbar{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}.ci-home-v63 .under-card strong,.ci-home-v63 .under-card small{display:block}.ci-home-v63 .card-bottom a{z-index:auto}