:root{
  --bg:#fff; --surface:#f6f8f9; --text:#1f2933; --muted:#5b6770; --line:#dde3e7;
  --navy:#344a5e; --teal:#2f9e91; --teal-bg:#e3f4f1; --accent:#2f9e91; --on-accent:#fff;
  --hover:#eef2f4; --shadow:0 1px 3px rgba(31,41,51,.10),0 8px 24px rgba(31,41,51,.06);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#14191d; --surface:#1c2328; --text:#e6ebee; --muted:#9aa7b0; --line:#2f3a42;
    --navy:#a9c0d4; --teal:#5fcdbf; --teal-bg:#193632; --accent:#5fcdbf; --on-accent:#10201e;
    --hover:#222b31; --shadow:0 1px 3px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);}
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:88px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{font-family:"Google Sans",Roboto,"Segoe UI",Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
img{max-width:100%}
.container{max-width:1128px;margin:0 auto;padding:0 24px}

/* top bar */
.top{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line);height:64px;display:flex;align-items:center;padding:0 24px;gap:4px}
.top .name{font-size:22px;color:var(--muted);margin-right:auto}
.top .name:hover{text-decoration:none}
.top .name b{color:var(--text);font-weight:500}
.top .sp{flex:1}
.top a.help{font-size:14px;font-weight:500;padding:8px 16px;border-radius:20px;color:var(--text)}
.top a.help:hover{background:var(--hover);text-decoration:none}
.top a.help.cur{color:var(--accent);background:var(--teal-bg)}

.btn{display:inline-block;background:var(--accent);color:var(--on-accent);padding:12px 26px;border-radius:24px;font-weight:600;font-size:15px;border:0;cursor:pointer}
.btn:hover{text-decoration:none;opacity:.92}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
.btn.ghost:hover{background:var(--hover)}
.btn[aria-disabled=true]{opacity:.6;cursor:default}

/* hero */
.hero{background:linear-gradient(180deg,var(--teal-bg),var(--bg) 85%);border-bottom:1px solid var(--line);overflow:hidden}
.hero-in{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding:72px 24px 64px}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.4px;color:var(--accent);background:var(--bg);border:1px solid var(--line);padding:4px 12px;border-radius:16px;margin-bottom:18px}
.hero h1{font-size:clamp(36px,5.2vw,56px);font-weight:600;line-height:1.1;letter-spacing:-.02em;margin-bottom:18px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{font-size:19px;color:var(--muted);max-width:560px;margin-bottom:28px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .facts{display:flex;gap:20px;flex-wrap:wrap;margin-top:28px;font-size:14px;color:var(--muted)}
.hero .facts span:before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--accent);margin-right:8px}

/* phone mock */
.phone{width:290px;margin:0 auto;background:var(--bg);border:8px solid var(--navy);border-radius:38px;box-shadow:var(--shadow);padding:18px 16px 14px;position:relative}
.phone .greet{font-size:13px;color:var(--muted)}
.phone .name{font-size:20px;font-weight:600;margin-bottom:10px}
.seg{display:flex;background:var(--surface);border-radius:16px;padding:3px;font-size:12px;margin-bottom:12px}
.seg span{flex:1;text-align:center;padding:5px 0;border-radius:13px;color:var(--muted)}
.seg span.on{background:var(--teal-bg);color:var(--accent);font-weight:600}
.ring{width:170px;height:170px;margin:0 auto 10px;position:relative}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring .c{position:absolute;inset:0;display:grid;place-content:center;text-align:center}
.ring .c b{font-size:28px;font-weight:600;line-height:1.1}
.ring .c small{font-size:12px;color:var(--muted)}
.leave{background:var(--teal-bg);color:var(--accent);font-weight:600;font-size:13px;text-align:center;border-radius:12px;padding:8px;margin-bottom:10px}
.mini{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;font-size:11px;text-align:center;color:var(--muted)}
.mini div{background:var(--surface);border-radius:10px;padding:7px 2px}
.mini b{display:block;color:var(--text);font-size:14px}
.fab{margin:14px auto 0;display:block;width:max-content;background:var(--accent);color:var(--on-accent);font-weight:600;font-size:13px;padding:10px 20px;border-radius:16px}
.float{position:absolute;background:var(--bg);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:14px;padding:10px 14px;font-size:12.5px;line-height:1.35}
.float b{display:block;font-size:13px}
.float.a{right:-95px;top:20px;max-width:170px}.float.b{left:-95px;bottom:60px;max-width:170px}

/* sections */
.band{padding:72px 0}
.band.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-h{max-width:680px;margin-bottom:40px}
.sec-h h2{font-size:clamp(28px,3.6vw,38px);font-weight:600;letter-spacing:-.015em;line-height:1.2;margin-bottom:12px}
.sec-h p{font-size:18px;color:var(--muted)}
.grid{display:grid;gap:16px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:22px;transition:box-shadow .2s,transform .2s}
a.card{display:block;color:var(--text)}
a.card:hover{text-decoration:none;box-shadow:var(--shadow);transform:translateY(-2px)}
.card .ic{width:42px;height:42px;border-radius:12px;background:var(--teal-bg);color:var(--accent);display:grid;place-items:center;margin-bottom:14px}
.card h3{font-size:17px;font-weight:600;margin-bottom:6px}
.card p{font-size:14.5px;color:var(--muted)}
.card .more{display:inline-block;margin-top:10px;font-size:14px;font-weight:600;color:var(--accent)}

.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.steps li{list-style:none;counter-increment:s;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:22px}
.steps li:before{content:counter(s);display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-weight:700;margin-bottom:12px}
.steps h3{font-size:16px;margin-bottom:4px}.steps p{font-size:14px;color:var(--muted)}

.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split h2{font-size:clamp(26px,3.2vw,34px);font-weight:600;line-height:1.2;margin-bottom:12px}
.split p{color:var(--muted);font-size:17px;margin-bottom:14px}
.ticks{list-style:none;margin:14px 0}
.ticks li{padding-left:28px;position:relative;margin-bottom:9px}
.ticks li:before{content:"";position:absolute;left:0;top:7px;width:14px;height:8px;border-left:2.5px solid var(--accent);border-bottom:2.5px solid var(--accent);transform:rotate(-45deg)}

.panel{background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow)}
.panel h4{font-size:13px;letter-spacing:.5px;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-weight:600}
.bars{display:flex;align-items:flex-end;gap:10px;height:120px;margin-bottom:8px}
.bars i{flex:1;background:var(--accent);border-radius:6px 6px 0 0;opacity:.9}
.bars i.s{background:#e0a458}.bars i.o{background:var(--line)}
.bars-l{display:flex;gap:10px;font-size:12px;color:var(--muted)}.bars-l span{flex:1;text-align:center}
.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:5px;font-size:12px;text-align:center}
.cal span{padding:8px 0;border-radius:8px;background:var(--surface);color:var(--muted)}
.cal .h{background:var(--teal-bg);color:var(--accent);font-weight:600}
.cal .m{background:#fbe9e7;color:#b3402a;font-weight:600}
.cal .o{background:transparent;opacity:.5}
.cal .d{font-size:11px;font-weight:600;background:none;color:var(--muted)}
@media (prefers-color-scheme:dark){.cal .m{background:#3b2420;color:#ff9b87}}

.callout{background:var(--teal-bg);border-radius:20px;padding:36px;display:flex;gap:24px;flex-wrap:wrap;align-items:center;justify-content:space-between}
.callout h2{font-size:26px;font-weight:600;margin-bottom:6px}.callout p{color:var(--muted);max-width:600px}

/* details / FAQ */
details{border-bottom:1px solid var(--line)}
details:first-of-type{border-top:1px solid var(--line)}
summary{cursor:pointer;padding:16px 36px 16px 0;font-weight:500;font-size:16px;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary:after{content:"";position:absolute;right:6px;top:50%;width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:translateY(-70%) rotate(45deg);transition:transform .2s}
details[open] summary:after{transform:translateY(-30%) rotate(225deg)}
details .ans{padding:0 0 18px;color:var(--muted);font-size:15.5px}
details .ans p{margin-bottom:10px}
details .ans ul,details .ans ol{margin:0 0 10px 22px}
.faq-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:20px}
.faq-tools input{flex:1;min-width:220px;padding:12px 18px;border-radius:24px;border:1px solid var(--line);background:var(--bg);color:var(--text);font:inherit;font-size:15px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{font:inherit;font-size:13.5px;padding:7px 14px;border-radius:18px;border:1px solid var(--line);background:var(--bg);color:var(--muted);cursor:pointer}
.chip.on{background:var(--teal-bg);color:var(--accent);border-color:var(--accent);font-weight:600}
.faq-group{margin-bottom:36px}
.faq-group h2{font-size:22px;font-weight:600;margin-bottom:10px}
.empty{display:none;padding:24px;text-align:center;color:var(--muted)}

/* docs layout */
.page-hero{background:var(--surface);border-bottom:1px solid var(--line)}
.page-hero .container{padding-top:56px;padding-bottom:40px}
.page-hero h1{font-size:clamp(32px,4.6vw,46px);font-weight:400;line-height:1.15;margin-bottom:12px;letter-spacing:-.015em}
.page-hero p{font-size:18px;color:var(--muted);max-width:720px}
.wrap{display:grid;grid-template-columns:250px minmax(0,1fr);gap:56px}
nav.toc{position:sticky;top:64px;align-self:start;padding:28px 0;max-height:calc(100vh - 64px);overflow-y:auto;scrollbar-width:none}
nav.toc::-webkit-scrollbar{display:none}
.grp{margin-bottom:10px}
.grp-h{font-size:12px;font-weight:600;letter-spacing:.8px;text-transform:uppercase;color:var(--muted);padding:8px 16px 4px}
nav.toc a{display:block;padding:5px 16px;font-size:14px;line-height:1.4;color:var(--muted);border-radius:0 20px 20px 0;border-left:3px solid transparent;margin:0}
nav.toc a:hover{background:var(--hover);text-decoration:none;color:var(--text)}
nav.toc a.on{color:var(--accent);background:var(--teal-bg);border-left-color:var(--accent);font-weight:600}
main.doc{padding:32px 0 96px;min-width:0;max-width:780px}
.feature{padding:44px 0;border-top:1px solid var(--line)}
.feature:first-of-type{border-top:0;padding-top:8px}
.feature h2{font-size:30px;font-weight:600;line-height:1.25;margin-bottom:6px;letter-spacing:-.01em}
.feature .tag{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.4px;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.feature .sum{font-size:18px;color:var(--muted);margin-bottom:20px}
.feature h3{font-size:16px;font-weight:600;margin:22px 0 8px;text-transform:uppercase;letter-spacing:.5px;color:var(--navy);font-size:13px}
.feature p{margin-bottom:12px}
.feature ul,.feature ol{margin:0 0 12px 24px}
.feature li{margin-bottom:6px}
.use{background:var(--surface);border-left:4px solid var(--accent);border-radius:0 12px 12px 0;padding:14px 18px;margin:12px 0;font-size:15.5px}
.use b{display:block;margin-bottom:2px}
.note{background:var(--teal-bg);border-radius:12px;padding:14px 18px;margin:14px 0;font-size:15px}
.note b{font-weight:600}
kbd,code{font-family:ui-monospace,Consolas,monospace;font-size:.9em;background:var(--hover);border:1px solid var(--line);border-radius:5px;padding:1px 6px}
table{width:100%;border-collapse:collapse;margin:8px 0 20px;font-size:15px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-weight:600;color:var(--muted);font-size:13px}
.scroll{overflow-x:auto}
.lang{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.lang span{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:4px 14px;font-size:14px}

footer{border-top:1px solid var(--line);background:var(--surface);margin-top:0}
footer .container{padding-top:36px;padding-bottom:36px;display:flex;gap:32px;flex-wrap:wrap;justify-content:space-between;font-size:14px;color:var(--muted)}
footer h5{font-size:13px;color:var(--text);margin-bottom:8px;font-weight:600}
footer a{display:block;color:var(--muted);margin-bottom:5px}
footer .fine{flex-basis:100%;border-top:1px solid var(--line);padding-top:18px;font-size:13px}

@media (max-width:960px){
  .hero-in{grid-template-columns:1fr;padding:48px 24px 48px}
  .float{display:none}
  .g3,.g4,.steps{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:28px}
  .wrap{grid-template-columns:1fr;gap:0}
  html{scroll-padding-top:128px}
  nav.toc{position:sticky;top:64px;z-index:15;max-height:none;padding:10px 0;margin:0 -24px;padding-left:24px;padding-right:24px;background:var(--bg);border-bottom:1px solid var(--line);display:flex;gap:8px;overflow-x:auto;overflow-y:hidden;white-space:nowrap;-webkit-overflow-scrolling:touch}
  .grp-h{display:none}
  .grp,.grp-l{display:contents}
  nav.toc a{flex:none;display:inline-block;border-left:0;border-radius:18px;padding:7px 14px;margin:0;border:1px solid var(--line)}
  nav.toc a.on{border-color:var(--accent)}
}
@media (max-width:620px){
  .container{padding:0 16px}
  .top{padding:0 12px}
  nav.toc{margin:0 -16px;padding-left:16px;padding-right:16px}
  .scroll,.feature table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .feature table th,.feature table td{min-width:96px}
  .page-hero .container{padding-top:36px;padding-bottom:28px}
  .page-hero p{font-size:16px}
  .feature{padding:32px 0}
  .feature .sum{font-size:16.5px}
  summary{padding:14px 32px 14px 0;font-size:15.5px}
  .top .name{font-size:19px}
  .top a.help{padding:9px 10px;font-size:13px}
  .chips{flex-wrap:nowrap;overflow-x:auto;margin-left:-16px;margin-right:-16px;padding:0 16px 4px;scrollbar-width:none}
  .chips::-webkit-scrollbar{display:none}
  .chip{flex:none;padding:9px 16px}
  .faq-tools input{padding:13px 18px}
  .g3,.g2,.g4,.steps{grid-template-columns:1fr}
  .band{padding:48px 0}
  .hero-in{padding:36px 16px}
  .callout{padding:24px}
  .feature h2{font-size:25px}
}

/* column explainers */
table.cols td:first-child{font-weight:600;white-space:nowrap;color:var(--text)}
table.cols td{color:var(--muted);font-size:15px}
table.cols td b{color:var(--text);font-weight:600}
table.sample{font-size:13.5px}
table.sample th,table.sample td{padding:9px 10px;white-space:nowrap}
table.sample tr:nth-child(2) td,table.sample tr:nth-child(3) td{background:var(--surface)}
.feature h4{font-size:17px;font-weight:600;margin:26px 0 6px;color:var(--text)}
@media (max-width:620px){
  table.cols td:first-child{white-space:normal;min-width:110px}
}

/* excel ideas */
.idea{border:1px solid var(--line);border-radius:14px;padding:4px 20px 8px;margin:14px 0;background:var(--bg)}
.idea h4{margin-top:14px}
.idea p{font-size:15.5px;margin-bottom:8px}
.idea code{white-space:normal;word-break:break-word}