/* OS8 brand reference: 06_HP実装/index.html
   Common type scale: HP設計仕様.md (2026-09-04).
   NTT reference retained for information order and tabular comparison only. */
:root {
  --black:#0b0b0d; --white:#FFFFFF; --gray1:#F1F2F4; --line:#E3E4E8;
  --tx:#101116; --tx2:#4c4e56; --muted:#9a9aa1;
  --blue:#2563d6; --blue-hi:#1c54bb;
  --sans:"Yu Gothic Medium","Yu Gothic",YuGothic,"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",sans-serif;
  --bold:"Yu Gothic",YuGothic,"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",sans-serif;
  --body:.9rem; --support:.84rem; --note:.75rem;
  --action-primary:var(--blue); --cta-bg:var(--action-primary);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:114px}
body{margin:0;background:var(--white);color:var(--tx);font-family:var(--sans);font-size:var(--body);line-height:2.05;-webkit-font-smoothing:antialiased}
a{color:var(--tx)}
button{font:inherit;cursor:pointer}
a,button,summary{-webkit-tap-highlight-color:transparent}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}
.site-header a:focus-visible,.site-header button:focus-visible{outline-color:var(--white)}
a:hover{text-decoration-thickness:2px}
svg{max-width:100%}
h1,h2,h3{font-family:var(--bold);font-weight:700;word-break:normal;line-break:strict;text-wrap:balance}
p{color:var(--tx2)}
.wrap{width:100%;max-width:1060px;padding:0 40px;margin:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.skip{position:fixed;top:-100px;left:12px;z-index:20;background:var(--white);padding:8px 16px}
.skip:focus{top:6px}
.preview{background:var(--gray1);color:var(--tx2);font-size:var(--note);line-height:1.7;display:flex;justify-content:center;align-items:center;gap:24px;padding:6px 20px}
.preview nav{display:flex;gap:18px;flex-wrap:wrap}
.preview a[aria-current]{font-weight:700;text-decoration-thickness:2px;text-underline-offset:3px}
.site-header{position:sticky;top:0;z-index:5;background:var(--black);border-bottom:1px solid var(--line)}
.header-inner{max-width:1440px;margin:auto;padding:22px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-family:var(--bold);font-size:15px;font-weight:700;letter-spacing:.18em;text-decoration:none;white-space:nowrap;line-height:1.5}
.site-header .brand{color:var(--white);order:2}
.header-nav{display:flex;gap:8px;order:1}
.header-nav a{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:12.5px;line-height:1.5;color:var(--black);background:var(--white);font-weight:700;white-space:nowrap;text-decoration:none;transition:background .2s}
.header-nav a:hover{background:var(--gray1);text-decoration:underline;text-underline-offset:3px}
.cta{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:999px;background:var(--cta-bg);color:var(--white);padding:11px 22px;min-height:44px;font-size:13px;font-weight:700;line-height:1.7;text-decoration:none;transition:background .2s}
.cta:hover{background:var(--blue-hi);color:var(--white)}
.header-cta{order:3;white-space:nowrap}
.page-title{padding:78px 0 36px;background:var(--white);text-align:center}
h1{font-size:36px;line-height:1.5;letter-spacing:.025em;margin:0 0 17px}
.page-en{font-size:var(--note);letter-spacing:.42em;font-weight:600;line-height:1.6;color:var(--tx2);margin:0}
.hero{display:grid;grid-template-columns:1.45fr 1fr;align-items:center;gap:28px;padding:28px 0 58px;border-bottom:1px solid var(--line)}
.hero-copy{text-align:left}
.eyebrow{font-size:var(--support);font-weight:500;margin:0 0 18px;color:var(--tx2)}
.hero h2{font-size:30px;line-height:1.75;letter-spacing:.005em;margin:0 0 24px;color:var(--tx)}
.hero p.lead{font-size:var(--body);line-height:2.05;margin:0 0 24px}
.hero-price{display:flex;align-items:baseline;gap:6px;margin:0 0 22px;color:var(--tx2);font-size:var(--support);line-height:1.6;flex-wrap:wrap}
.hero-price b{font-family:var(--sans);font-size:32px;font-weight:500;color:var(--tx)}
.hero-price small{font-size:var(--note)}
.hero-art{width:100%;height:auto}
.section{padding-top:76px;padding-bottom:8px}
.section-title{font-size:28px;line-height:1.65;margin:0 0 34px;color:var(--tx);text-align:center}
.section-intro{font-size:var(--body);text-align:center;margin:-12px 0 28px}
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pain{padding:25px 20px;border:1px solid var(--line);border-radius:14px;background:var(--white);text-align:center;font-size:var(--body);line-height:1.95;color:var(--tx2)}
.pain span{display:block;font-size:22px;font-weight:400;letter-spacing:.04em;color:var(--tx2);line-height:1;margin-bottom:18px}
.feature{padding:24px 0;border-top:1px solid var(--line)}
.feature:last-child{border-bottom:1px solid var(--line)}
.feature h3{font-size:20px;line-height:1.7;color:var(--tx);margin:0 0 12px;display:flex;gap:14px;align-items:baseline}
.feature h3:before{content:'›';font-size:21px;font-weight:700;line-height:1}
.feature p{margin:0 0 0 24px;font-size:var(--body);line-height:2.05}
.table-note{text-align:right;font-size:var(--note);margin:-14px 0 10px;color:var(--tx2)}
.comparison{width:calc(100% + 16px);margin:0 -8px;border-spacing:8px 6px;border-collapse:separate;table-layout:fixed;line-height:1.9;font-size:var(--body)}
.comparison th,.comparison td{padding:20px 15px;text-align:center}
.comparison thead td{width:25%;padding:0}
.comparison thead th{font-size:20px;color:var(--white);background:var(--black);border:1px solid var(--black)}
.comparison thead th.p1{color:var(--tx);background:var(--gray1);border:1px solid var(--line)}
.comparison tbody th{font-weight:700;font-size:var(--body);background:var(--gray1);color:var(--tx);border:1px solid var(--line)}
.comparison tbody td{color:var(--tx2);background:var(--white);border:1px solid var(--line)}
.comparison small{display:block;font-size:var(--note);font-weight:400;color:var(--tx2);line-height:1.9;margin-top:6px}
.price{font-family:var(--sans);font-size:32px;font-weight:500;line-height:1.5;color:var(--tx);white-space:nowrap}
.price span{font-size:var(--support);margin-left:4px;color:var(--tx2)}
.note{font-size:var(--note);color:var(--tx2);line-height:2.05;margin:16px 0 0}
.scope{padding:20px 24px;border:1px solid var(--line);background:var(--gray1);font-size:var(--support);line-height:2.05;color:var(--tx2);margin-top:24px}
.scope b{display:block;font-family:var(--bold);font-size:var(--support);font-weight:700;color:var(--tx);margin-bottom:4px}
.usage{display:flex;gap:22px;margin-top:22px}
.usage>div{flex:1;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:18px 24px;background:var(--gray1);border:1px solid var(--line)}
.usage span{font-size:var(--support);color:var(--tx2)}
.usage b{font-family:var(--sans);font-size:26px;font-weight:500;color:var(--tx)}
.usage small{font-size:var(--support)}
.example{background:var(--gray1);border:1px solid var(--line);padding:24px;margin-top:24px;text-align:center;font-size:var(--body)}
.example>b{font-size:var(--support)}
.example p{margin:10px 0}
.example strong{font-size:22px;color:var(--tx);font-weight:500}
.example strong span{font-size:var(--note)}
.options-heading{font-size:21px;margin:36px 0 18px;text-align:center}
.option{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}
.option>div{padding:24px 18px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}
.option>div:first-child{background:var(--gray1)}
.option>div>span{font-size:var(--note);color:var(--tx2)}
.option b{font-size:var(--body)}
.option strong{font-family:var(--sans);font-size:28px;font-weight:500;line-height:1.6}
.option strong span{font-size:var(--support)}
.flow{display:grid;grid-template-columns:repeat(4,1fr);list-style:none;padding:0;margin:0;gap:26px}
.flow li{border-top:1px solid var(--line);padding:20px 8px 8px;position:relative}
.flow li+li:before{content:'›';position:absolute;top:63px;left:-20px;font-size:23px;line-height:1;color:var(--tx2)}
.step-num{display:block;font-size:27px;font-weight:400;line-height:1.2;color:var(--tx2)}
.step-num small{display:block;font-size:10px;letter-spacing:.18em;margin-bottom:6px}
.flow h3{font-size:18px;margin:14px 0 10px;line-height:1.7}
.flow p{font-size:var(--body);line-height:2.05;margin:0}
.faq-list{border-top:1px solid var(--line)}
details{border-bottom:1px solid var(--line)}
summary{list-style:none;display:flex;align-items:baseline;gap:16px;padding:24px 6px;cursor:pointer;font-size:var(--body);font-weight:700;color:var(--tx);line-height:1.9}
summary::-webkit-details-marker{display:none}
summary:before{content:'Q';font-size:20px;font-weight:400;line-height:1.3;flex:0 0 30px}
summary:after{content:'＋';margin-left:auto;font-size:20px;flex-shrink:0;font-weight:400}
details[open] summary:after{content:'−'}
details p{margin:0;padding:0 36px 24px 52px;font-size:var(--body);line-height:2.05}
.contact{padding:64px 30px;margin:76px 0 64px;text-align:center;background:var(--gray1);border:1px solid var(--line)}
.contact h2{font-size:28px;line-height:1.65;margin:0 0 18px}
.contact p{font-size:var(--body);line-height:2.05;margin:0 0 28px}
.footer{padding:44px 20px;border-top:1px solid var(--line);text-align:center;background:var(--black);color:var(--white)}
.footer .brand{color:var(--white)}
.footer p{font-size:var(--note);color:var(--line);margin:12px 0 0}
.mobile-cta,.mobile-comparison{display:none}
dialog{border:1px solid var(--line);border-radius:8px;padding:32px;max-width:480px;width:calc(100% - 40px);background:var(--white);color:var(--tx)}
dialog::backdrop{background:rgba(11,11,13,.55)}
dialog h2{font-size:24px;line-height:1.6;margin:0 0 18px}
dialog p{font-size:var(--body);line-height:2.05}
dialog button{display:block;background:var(--white);border:1px solid var(--tx);color:var(--tx);border-radius:999px;padding:9px 25px;margin:24px 0 0 auto;font-size:13px;font-weight:700}
dialog button:hover{background:var(--gray1)}
.keep{white-space:nowrap}
.hero h2 br.mobile-break{display:none}
@media(max-width:1100px){
 .header-inner{padding:18px 28px;gap:16px}
 .header-nav{gap:6px}
 .header-nav a{padding:7px 11px;font-size:12px}
 .hero h2{font-size:27px}
 .price{font-size:28px}
}
@media(max-width:850px){
 .header-inner{padding:18px 24px}
 .header-nav{display:none}
 .site-header .brand{order:1}
 .header-cta{order:2}
 .wrap{padding:0 30px}
 .hero{grid-template-columns:1fr 0.7fr;gap:18px}
 .hero h2{font-size:24px}
 .hero p.lead br{display:none}
 .comparison th,.comparison td{padding:18px 10px}
 .comparison thead th{font-size:18px}
 .price{font-size:26px}
 .pains{gap:14px}
 .pain{padding:22px 12px}
 .flow{grid-template-columns:1fr 1fr;gap:25px}
 .flow li:nth-child(3):before{display:none}
 .usage>div{flex-direction:column;gap:3px;padding:18px}
}
@media(max-width:600px){
 html{scroll-padding-top:85px}
 .preview{display:block;padding:7px 10px;text-align:center}
 .preview nav{justify-content:center;gap:12px;margin-top:4px}
 .header-inner{padding:16px 20px;gap:12px}
 .brand{font-size:13px;letter-spacing:.14em}
 .header-cta{font-size:12px;min-height:40px;padding:9px 15px}
 .wrap{padding:0 22px}
 .page-title{padding:48px 0 26px}
 h1{font-size:27px;margin-bottom:15px}
 .page-en{font-size:10px;letter-spacing:.35em}
 .hero{grid-template-columns:1fr;padding:14px 0 36px;gap:20px}
 .hero-copy{text-align:center}
 .eyebrow{font-size:var(--support);margin-bottom:16px}
 .hero h2{font-size:23px;line-height:1.8;margin-bottom:22px}
 .hero h2 br.mobile-break{display:initial}
 .hero p.lead{font-size:var(--body);line-height:2.05;text-align:left;margin-bottom:20px}
 .hero-price{justify-content:center;margin-bottom:20px}
 .hero-price b{font-size:30px}
 .hero-art{max-width:320px;max-height:195px;justify-self:center}
 .section{padding-top:52px;padding-bottom:0}
 .section-title{font-size:24px;line-height:1.7;margin-bottom:26px}
 .pains{grid-template-columns:1fr;gap:14px}
 .pain{display:flex;gap:20px;align-items:center;text-align:left;padding:20px;font-size:var(--body)}
 .pain span{font-size:22px;margin:0}
 .feature{padding:22px 0}
 .feature h3{font-size:18px;gap:10px;margin-bottom:12px}
 .feature p{margin-left:0;font-size:var(--body)}
 .comparison{display:none}
 .mobile-comparison{display:grid;gap:24px}
 .mobile-plan{border:1px solid var(--line)}
 .mobile-plan h3{margin:0;padding:18px;text-align:center;font-size:20px;color:var(--white);background:var(--black)}
 .mobile-plan h3.p1{background:var(--gray1);color:var(--tx)}
 .mobile-plan dl{padding:4px 18px;margin:0}
 .mobile-plan dl>div{border-bottom:1px solid var(--line);padding:14px 0}
 .mobile-plan dl>div:last-child{border:0}
 .mobile-plan dt{font-size:var(--support);font-weight:700;color:var(--tx);margin-bottom:5px}
 .mobile-plan dd{font-size:var(--body);line-height:2.05;color:var(--tx2);margin:0}
 .mobile-plan small{display:block;font-size:var(--note);line-height:2.05;color:var(--tx2);margin-top:4px}
 .price{font-size:30px}
 .price span{font-size:var(--support)}
 .usage{gap:12px}
 .usage>div{padding:15px 6px}
 .usage b{font-size:23px}
 .scope{font-size:var(--support);padding:18px;margin-top:22px}
 .example{padding:20px 14px}
 .example strong{font-size:20px}
 .option{grid-template-columns:1fr}
 .option>div{padding:20px 12px}
 .option strong{font-size:26px}
 .flow{grid-template-columns:1fr;gap:18px}
 .flow li{display:grid;grid-template-columns:43px 1fr;gap:0 16px;padding:20px 2px 8px}
 .flow li+li:before{display:none}
 .step-num{grid-row:1/3;font-size:25px;align-self:center}
 .flow h3{font-size:18px;margin:0 0 8px}
 .flow p{font-size:var(--body)}
 summary{padding:20px 2px;gap:9px;font-size:var(--body)}
 summary:before{flex-basis:24px;font-size:20px}
 details p{padding:0 5px 22px 35px;font-size:var(--body)}
 .contact{margin:52px 0 42px;padding:38px 18px}
 .contact h2{font-size:23px}
 .contact p{font-size:var(--body)}
 .footer{padding-bottom:105px}
 .mobile-cta{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:6;justify-content:center;background:var(--white);border-top:1px solid var(--line);padding:10px 22px calc(10px + env(safe-area-inset-bottom))}
 .mobile-cta .cta{width:100%;max-width:400px;font-size:13px;min-height:44px}
 dialog{padding:27px 24px}
 dialog h2{font-size:22px}
}
@media(max-width:350px){
 .header-inner{padding:15px 15px;gap:8px}
 .brand{font-size:12px;letter-spacing:.09em}
 .header-cta{padding:8px 12px}
 .preview nav{gap:9px}
 .wrap{padding:0 20px}
 h1{font-size:24px}
 .hero h2{font-size:20px}
 .section-title{font-size:22px}
 .usage span,.usage small{font-size:var(--note)}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}a,button{transition:none}}