/* Aitius introduction page (/). The app is at /app/.
   One typeface, Noto Sans JP (400 / 500 / 700), with proportional kana (palt) in headings. The first screen and the
   closing band are the app's own dark ground and gold; the reading sections are white, so the dark product screens
   stand out on them. The privacy band is a calm dark ground with a faint gold light (it was the pitch's green stripes until
   Shin 2026-11-10「あまりにも芝生芝生しすぎてる」). */
:root{
  --ink:#0f1115; --ink2:#171a20; --ink-line:#2b3038; --on-ink:#eef0f3; --on-ink-sub:#a7adb8;
  --paper:#ffffff; --mist:#f3f5f8; --text:#16191e; --sub:#5a616d; --line:#e1e5eb;
  --gold:#e8b931; --gold-hover:#f2c84a; --gold-ink:#1a1405; --gold-text:#8a6500;
  --font:"Noto Sans JP",system-ui,-apple-system,"Hiragino Sans","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;
  --gut:max(20px,env(safe-area-inset-left)); --wide:1140px; --top:64px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--top) + 16px)}
body{margin:0;background:var(--paper);color:var(--text);font:400 16px/1.9 var(--font);letter-spacing:.03em;word-break:auto-phrase;-webkit-font-smoothing:antialiased}   /* Japanese breaks between phrases */
a{color:inherit}
img,video{display:block;max-width:100%;height:auto}
h1,h2,h3{margin:0;font-weight:700;font-feature-settings:"palt";letter-spacing:.02em;text-wrap:balance;word-break:auto-phrase}
p{margin:0;text-wrap:pretty}
ul,ol{margin:0;padding:0;list-style:none}
[hidden]{display:none!important}   /* the install button and the other iPhone steps stay hidden over their own display */
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:6px}
.defs{position:absolute}
svg use{stroke:currentColor}
.wrap{max-width:var(--wide);margin:0 auto;padding:0 var(--gut)}
section h2{font-size:clamp(26px,3.2vw,36px);line-height:1.45}
.sec-lead{margin-top:14px;color:var(--sub);font-size:17px}

/* buttons: gold is the one action (open the app); the others are outlines */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 24px;border-radius:10px;border:1px solid transparent;
  font:700 16px/1 var(--font);letter-spacing:.04em;text-decoration:none;white-space:nowrap;transition:background-color .15s,border-color .15s}
.btn.gold{background:var(--gold);color:var(--gold-ink)}
.btn.gold:hover{background:var(--gold-hover)}
.btn.line{border-color:var(--ink-line);color:var(--on-ink)}
.btn.line:hover{border-color:var(--on-ink-sub)}
.btn.sm{min-height:40px;padding:0 16px;font-size:14px}
.btn.lg{min-height:56px;padding:0 32px;font-size:17px}

/* the bar at the top: stays while reading */
.top{position:sticky;top:0;z-index:10;background:rgba(15,17,21,.92);backdrop-filter:saturate(1.2) blur(10px);-webkit-backdrop-filter:saturate(1.2) blur(10px);border-bottom:1px solid rgba(255,255,255,.06)}
.top-in{display:flex;align-items:center;gap:32px;max-width:var(--wide);height:var(--top);margin:0 auto;padding:0 var(--gut)}
.brand{display:flex;flex:none}
.wordmark{height:24px;width:auto}
.wm-ai{fill:var(--gold)} .wm-rest{fill:var(--on-ink)}
.nav{display:flex;gap:28px;margin-left:auto;font-size:14px;font-weight:500}
.nav a{color:var(--on-ink-sub);text-decoration:none}
.nav a:hover{color:var(--on-ink)}

/* first screen: what it is, and the app in a coach's hand at the pitch */
.hero{background:var(--ink);color:var(--on-ink);overflow:hidden}
.hero-in{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:64px;align-items:center;max-width:var(--wide);margin:0 auto;padding:72px var(--gut) 0}
.hero-copy{padding-bottom:80px}
h1{font-size:clamp(34px,4.6vw,56px);line-height:1.32}
.kind{display:inline-block;margin-bottom:20px;padding:5px 14px;border:1px solid rgba(232,185,49,.5);border-radius:999px;color:var(--gold);font-size:13px;font-weight:700;letter-spacing:.06em}   /* what kind of product, as Koyomi Desk's first line */
.lead{margin-top:28px;max-width:32em;font-size:17px;line-height:1.95;color:#cdd2da}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.cta-note{margin-top:18px;max-width:34em;color:var(--on-ink-sub);font-size:14px;line-height:1.8}
.checks li,.private-list li{display:flex;align-items:flex-start;gap:10px}
.checks svg,.private-list svg{flex:none;width:18px;height:18px;margin-top:.28em;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.hero-shot{margin:0;align-self:end;width:min(340px,30vw);padding:10px 10px 0;border-radius:38px 38px 0 0;background:#262a31;
  box-shadow:0 0 0 1px rgba(255,255,255,.08),0 -20px 80px -20px rgba(232,185,49,.18)}
.hero-shot img{border-radius:30px 30px 0 0}

/* two ways in (Shin 2026-11-09「LPがあまりにも指導よりなので個人のレベルアップにも使える感じ」): the team and one player
   side by side, the same people as below, each pointing to its own part of the page */
.ways{padding:88px 0 0}
.way-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin-top:40px}
.way{display:flex;flex-direction:column;padding:32px;border-radius:18px;border:1px solid var(--line);background:var(--paper)}
.way-who{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.way-who svg{flex:none;width:72px;height:72px}
.way-who p{font-size:13px;font-weight:700;color:var(--sub)}
.way-name{font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--gold-text)}
.way h3{margin-top:6px;font-size:22px;line-height:1.5}
.way .checks{margin-bottom:24px}
.way-go{margin-top:auto;align-self:flex-start;display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:10px;background:var(--mist);font-size:14px;font-weight:700;text-decoration:none}
.way-go::after{content:"";width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px)}   /* down the page */
.way-go:hover{background:#e8ebf0}

/* before and after, by role: a row each, before → after side by side so they are the same height (as Koyomi Desk's), with
   the same family of people (scratchpad/chars/make.py: worried before, smiling after) */
.change{padding:104px 0 96px}
.ba-list{display:flex;flex-direction:column;gap:16px;margin-top:48px}
.ba{display:grid;grid-template-columns:minmax(0,1fr) 52px minmax(0,1fr);align-items:stretch;gap:10px}
.ba>*{min-width:0}
.ba-b,.ba-a{display:flex;gap:22px;align-items:center;padding:22px 26px;border-radius:18px}
.ba-b{background:#F2F3F6}
.ba-a{background:var(--paper);border:2px solid #F0D58A;box-shadow:0 10px 30px rgba(232,185,49,.12)}
.ba-who{display:flex;flex-direction:column;align-items:center;gap:6px;flex:none;width:124px;font-size:13px;font-weight:700;color:var(--sub);text-align:center}   /* one width, so the text starts at the same place in every row */
.ba-who svg{width:96px;height:96px}
.ba h3{margin:8px 0 4px;font-size:18px;line-height:1.55}
.ba-b h3{color:#3d434d}
.ba p{font-size:14.5px;line-height:1.8;color:var(--sub)}
.ba-arrow{display:flex;align-items:center;justify-content:center}
.tag-b,.tag-a{display:inline-block;padding:1px 12px;border-radius:999px;font-size:12px;font-weight:700;letter-spacing:.04em}
.tag-b{background:#E2E5EC;color:var(--sub)}
.tag-a{background:var(--gold);color:var(--gold-ink)}
.role{font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--gold-text)}

/* one player's own practice: three steps (a real sequence) beside the app stopped on a kick */
.solo{padding:104px 0;background:var(--ink);color:var(--on-ink);overflow:hidden}
.solo-in{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:64px;align-items:center}
.solo .sec-lead{color:var(--on-ink-sub)}
.solo-steps{counter-reset:o;display:flex;flex-direction:column;gap:22px;margin-top:40px}
.solo-steps li{counter-increment:o;position:relative;display:flex;flex-direction:column;gap:4px;padding-left:56px}
.solo-steps li::before{content:counter(o);position:absolute;left:0;top:0;display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--gold);color:var(--gold-ink);font-weight:700;font-size:16px}
.solo-steps b{font-size:18px;line-height:1.6;font-feature-settings:"palt"}
.solo-steps span{color:#c3c8d1;font-size:15px}
.solo-more{margin-top:28px;padding-top:20px;border-top:1px solid var(--ink-line);color:var(--on-ink-sub);font-size:14px}
.solo-shot{margin:0;width:min(320px,30vw);padding:10px;border-radius:38px;background:#262a31;box-shadow:0 0 0 1px rgba(255,255,255,.06),0 30px 60px -20px rgba(0,0,0,.6)}
.solo-shot img{border-radius:28px}

/* features: words on the left, the screen under or beside them */
.features{padding:96px 0 112px;background:var(--mist)}
.feat{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:56px;align-items:center;margin-top:88px}
.features .sec-lead+.feat{margin-top:64px}
.fname{margin-bottom:10px;font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--gold-text)}
.feat h3{font-size:24px;line-height:1.5}
.feat-text>p:not(.fname){margin-top:14px;color:var(--sub);font-size:15px}
.checks{display:flex;flex-direction:column;gap:6px;margin-top:20px;font-size:15px;font-weight:500}
.checks svg{color:var(--gold-text)}
.stage{border-radius:16px;overflow:hidden;background:var(--ink);box-shadow:0 1px 2px rgba(16,24,40,.06),0 24px 48px -24px rgba(16,24,40,.35)}
.stage.phone,.stage.pitch{display:flex;justify-content:center;padding:36px 24px 0;background:linear-gradient(180deg,#1d2128,var(--ink))}
.stage.phone{max-height:520px}
.stage.phone img{width:min(290px,72%);align-self:flex-start;border-radius:24px 24px 0 0;box-shadow:0 0 0 1px rgba(255,255,255,.08)}
.stage.pitch{padding:28px}
.clip{position:relative;width:min(520px,100%)}
.clip video{width:100%;border-radius:8px}
.clip-btn{position:absolute;right:10px;top:10px;min-height:32px;padding:0 12px;border:0;border-radius:8px;background:rgba(15,17,21,.75);color:#fff;font:500 12px/1 var(--font);letter-spacing:.04em;cursor:pointer}
.more-head{margin-top:104px;font-size:22px}
.more{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:28px}
.more li{display:flex;flex-direction:column;gap:6px;padding:24px;border-radius:12px;background:var(--paper);border:1px solid var(--line)}
.more b{font-size:16px;font-feature-settings:"palt"}
.more span{color:var(--sub);font-size:14px;line-height:1.8}

/* who uses it for what: a line in their words and the features it takes */
.scenes{padding:104px 0}
.scene-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:48px}
.scene{display:flex;flex-direction:column;gap:10px;padding:24px;border-radius:14px;border:1px solid var(--line)}
.scene .voice{font-size:16px;font-weight:700;line-height:1.7;font-feature-settings:"palt"}
.scene .uses{margin-top:auto;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--sub)}

/* sports */
.sports{padding:96px 0;background:var(--mist)}
.sport-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:40px}
.sport-list li{display:flex;flex-direction:column;gap:6px;padding:24px;border-radius:12px;background:var(--paper);border:1px solid var(--line)}
.sport-list b{font-size:17px;font-feature-settings:"palt"}
.sport-list span{color:var(--sub);font-size:14px;line-height:1.8}

/* privacy: a calm dark ground, a faint gold light behind the heading (no grass) */
.private{background:radial-gradient(ellipse 55% 90% at 8% 0%,rgba(232,185,49,.08),transparent 62%),var(--ink2);color:var(--on-ink)}
.private-in{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:56px;align-items:center;padding-top:96px;padding-bottom:96px}
.private h2{font-size:clamp(26px,3.4vw,40px)}
.private p{margin-top:20px;font-size:16px;color:#c3c8d1}
.private-list{display:flex;flex-direction:column;gap:16px;padding:28px;border-radius:14px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.10)}
.private-list svg{color:var(--gold)}
.private-list span{display:flex;flex-direction:column;gap:2px;font-size:14px;line-height:1.75;color:var(--on-ink-sub)}
.private-list b{font-size:15px;color:#fff}

/* how to start: a real sequence, so numbered */
.start{padding:104px 0 88px}
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px;margin-top:48px}
.steps li{counter-increment:s;display:flex;flex-direction:column;gap:6px}
.steps li::before{content:counter(s);display:grid;place-items:center;width:40px;height:40px;margin-bottom:10px;border-radius:50%;background:var(--ink);color:var(--gold);font-weight:700;font-size:17px}
.steps b{font-size:18px;font-feature-settings:"palt"}
.steps span{color:var(--sub);font-size:15px}
.start-guide{margin-top:36px;color:var(--sub);font-size:15px}
.start-guide a,.faq details a{color:var(--gold-text)}
/* アプリとして追加: the steps for each kind of device (Koyomi Desk's wording), this device's marked and first */
.install{padding:96px 0;background:var(--mist)}
.install-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}
.install-head .sec-lead{max-width:40em}
.dev-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:40px}
.dev{position:relative;padding:28px;border-radius:14px;background:var(--paper);border:1px solid var(--line)}
.dev.mine{order:-1;border-color:var(--gold);box-shadow:0 0 0 1px var(--gold)}
.dev.mine::after{content:"お使いの端末";position:absolute;top:-12px;left:20px;padding:2px 10px;border-radius:999px;background:var(--gold);color:var(--gold-ink);font-size:12px;font-weight:700}
html[lang="en"] .dev.mine::after{content:"Your device"}   /* the English page (/en/) */
.dev h3{margin-bottom:16px;font-size:18px}
.appsteps{counter-reset:a;display:flex;flex-direction:column;gap:12px}
.appsteps li{counter-increment:a;position:relative;padding-left:36px;font-size:14px;line-height:1.85}
.appsteps li::before{content:counter(a);position:absolute;left:0;top:1px;display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--ink);color:var(--gold);font-size:12px;font-weight:700}
.dev-note{margin-top:14px;font-size:13px;color:var(--sub)}
.faq details a{color:var(--gold-text)}

.faq{padding:72px 0 104px}
.faq .wrap{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:24px 56px;align-items:start}
.faq details{border-top:1px solid var(--line)}
.faq details:last-of-type{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;position:relative;padding:20px 44px 20px 0;font-weight:700;font-size:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:10px;top:50%;width:10px;height:10px;border-right:2px solid var(--sub);border-bottom:2px solid var(--sub);transform:translateY(-70%) rotate(45deg);transition:transform .15s}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq details p{padding:0 0 22px;color:var(--sub);font-size:15px}

.last{background:var(--ink);color:var(--on-ink);text-align:center;padding:104px 0 112px}
.last .wrap{display:flex;flex-direction:column;align-items:center}
.last h2{margin-top:0;font-size:clamp(28px,3.6vw,42px)}
.last h2+p{margin-top:16px;color:var(--on-ink-sub)}
.last .btn{margin-top:36px}

.foot{background:var(--ink2);color:var(--on-ink-sub);font-size:13px;line-height:1.8}
.foot-in{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 48px;padding-top:36px;padding-bottom:calc(36px + env(safe-area-inset-bottom,0px))}
.foot-name{color:var(--on-ink);font-weight:700;font-size:15px}
.credit{max-width:46em;justify-self:end}
.credit a{color:var(--on-ink-sub)}
.foot-links{display:flex;flex-wrap:wrap;gap:4px 20px;margin-top:6px}
.foot-links a{color:var(--on-ink-sub);text-decoration:none}
.foot-links a:hover{color:var(--on-ink);text-decoration:underline}

/* 利用規約・プライバシーポリシー (terms.html, privacy.html): one readable column */
.top-open{margin-left:auto}
.legal{padding:48px 0 96px}
.legal .wrap{max-width:820px}
.legal-back{font-size:14px}
.legal-back a,.legal a{color:var(--gold-text)}
.legal h1{margin-top:18px;font-size:clamp(28px,3.4vw,36px);line-height:1.4}
.legal-lead{margin-top:24px}
.legal h2{margin-top:44px;font-size:19px;line-height:1.6}
.legal h2+*{margin-top:12px}
.legal p+p,.legal p+ul,.legal p+ol,.legal ul+p,.legal ol+p{margin-top:12px}
.legal ul{list-style:disc;padding-left:1.4em}
.legal ol{list-style:decimal;padding-left:1.6em}
.legal li+li{margin-top:6px}
.legal p,.legal li{font-size:15.5px;line-height:1.95}
.legal-date{margin-top:48px;color:var(--sub);font-size:14px}
/* 撮り方と使い方のコツ (guide.html, 2026-11-10): the legal pages' column, with checked tips and one figure of where to stand */
.legal ul.guide-tips{list-style:none;padding-left:0;gap:16px;margin-top:16px}
.guide-tips span{display:flex;flex-direction:column;gap:2px;font-weight:400;color:var(--sub)}
.guide-tips b{font-weight:700;color:var(--text)}
.guide-fig{margin:18px 0 6px}
.guide-fig svg{display:block;width:100%;max-width:640px;height:auto}
.guide-fig figcaption{margin-top:8px;font-size:14px;color:var(--sub)}
/* 図の文字は viewBox の単位。スマホでは図が縮むので大きめに（12px 前後に見える） */
.guide-fig .gf-main{font-size:18px}.guide-fig .gf-sub{font-size:16px}
@media (max-width:600px){.guide-fig .gf-main{font-size:28px}.guide-fig .gf-sub{font-size:25px}}
.guide-go{margin-top:44px}
.legal .guide-go a{color:var(--gold-ink)}

/* ページの先頭へ (Shin 2026-11-10; the Aitius A on a dark square did not suit the page →「普通のアイコンでいい」): a plain white
   circle with an up chevron, after the first screen has gone by; the chevron rises a little under the pointer */
.totop{position:fixed;right:max(20px,env(safe-area-inset-right));bottom:calc(20px + env(safe-area-inset-bottom,0px));z-index:9;display:grid;place-items:center;width:48px;height:48px;border-radius:50%;
  background:var(--paper);color:var(--text);border:1px solid var(--line);box-shadow:0 8px 24px -8px rgba(16,24,40,.35);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .2s,transform .2s,visibility .2s,background-color .15s}
.totop.show{opacity:1;visibility:visible;transform:none}
.totop svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;transition:transform .2s}
.totop:hover{background:var(--mist)}
.totop:hover svg{transform:translateY(-2px)}

@media (max-width: 960px){
  .nav{display:none}
  .top-in{justify-content:space-between}
  .hero-in{grid-template-columns:minmax(0,1fr);gap:48px;padding-top:48px}
  .hero-copy{padding-bottom:0}
  .hero-shot{justify-self:center;width:min(300px,78vw)}
  .dev-list,.way-list{grid-template-columns:minmax(0,1fr)}
  .solo-in{grid-template-columns:minmax(0,1fr);gap:48px}
  .solo-shot{justify-self:center;width:min(300px,78vw)}
  .ba{grid-template-columns:minmax(0,1fr)}
  .ba-arrow svg{transform:rotate(90deg)}
  .ba-b,.ba-a{flex-direction:column;align-items:flex-start;gap:10px;padding:20px}
  .ba-list{gap:36px}   /* the roles apart more than a before and its after */
  .ba-who{flex-direction:row;gap:10px;width:auto}
  .ba-who svg{width:56px;height:56px}
  .scene-list,.steps,.sport-list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .install-head{flex-direction:column;align-items:flex-start}
  .feat{grid-template-columns:minmax(0,1fr);gap:28px;margin-top:72px}
  .more{grid-template-columns:repeat(2,minmax(0,1fr))}
  .private-in{grid-template-columns:minmax(0,1fr);gap:32px;padding-top:72px;padding-bottom:72px}
  .foot-in{grid-template-columns:minmax(0,1fr)}
  .credit{justify-self:start}
  .faq .wrap{grid-template-columns:minmax(0,1fr);gap:24px}
}
@media (max-width: 560px){
  .cta .btn{flex:1 1 100%}
  .more{grid-template-columns:minmax(0,1fr)}
  .change,.scenes,.start,.sports,.install,.solo{padding:72px 0}
  .ways{padding-top:64px}
  .way{padding:24px}
  .way-who svg{width:56px;height:56px}
  .scene-list,.steps,.sport-list{grid-template-columns:minmax(0,1fr)}
  .dev{padding:22px}
  .features{padding:72px 0 88px}
  .last{padding:80px 0 88px}
  .more li{padding:20px}
  .stage.pitch{padding:14px}
  .lead{font-size:16px}
}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} .btn,.faq summary::after,.totop,.totop svg{transition:none} }