@font-face{font-family:StudyCoPi;src:url('assets/noto-sans-jp.woff2') format('woff2');font-weight:400 700;font-display:swap}
:root{color-scheme:light dark;--bg:#f5f7fc;--surface:#fff;--soft:#e8effa;--text:#122449;--muted:#4f6080;--line:#cad5e8;--accent:#1255c7;--on-accent:#fff;--focus:#1255c7;--shadow:0 20px 56px #12244914}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;font-family:StudyCoPi,'Noto Sans JP',sans-serif;background:var(--bg);color:var(--text);font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:.22em}button{font:inherit}a,button,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:5px}img{display:block;max-width:100%;height:auto}figure,p,h1,h2,h3{margin:0}button,a,summary{touch-action:manipulation}button:disabled{cursor:default}.wrap{width:min(1160px,calc(100% - 80px));margin-inline:auto}.section{padding-block:80px;scroll-margin-top:12px}h1,h2,h3{line-height:1.4;letter-spacing:-.035em;font-weight:700}h1{font-size:clamp(36px,4.2vw,58px);line-height:1.35}h2{font-size:clamp(28px,3vw,40px)}h3{font-size:24px}p{color:var(--muted)}.section-heading{margin-bottom:32px}.section-heading p{margin-top:16px;max-width:660px}.small-note{font-size:13px;line-height:1.85}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:fixed;top:-100px;left:16px;padding:12px 24px;background:var(--surface);z-index:100}.skip:focus{top:12px}.site-header{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}.header-inner{height:76px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;font-weight:700;font-size:21px;white-space:nowrap}.brand img{border-radius:9px}.desktop-nav{display:flex;gap:28px;margin-left:auto;font-size:14px}.desktop-nav a{text-decoration:none;padding-block:10px}.desktop-nav a:hover,.text-link:hover,.site-footer a:hover{text-decoration:underline}.button{min-height:52px;display:inline-flex;align-items:center;justify-content:center;gap:20px;padding:12px 24px;border:1px solid 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h3{font-size:22px}.native-feature p{margin-top:16px;font-size:15px}.native-feature .small-note{font-size:12px}.alarm-feature{grid-row:span 2;display:flex;flex-direction:column;align-items:flex-start}.alarm-feature>img{margin:24px auto 0;width:200px;border-radius:16px}.widget-feature img{width:100%;max-width:350px;margin:24px auto 0}.sound-feature{grid-column:1/-1;background:var(--soft);border:0;display:grid;grid-template-columns:.55fr 1fr;gap:32px;align-items:center}.sound-feature p{margin:0}.platforms .section-heading{max-width:700px}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;text-align:left;font-size:15px}th,td{padding:20px 16px;border-bottom:1px solid var(--line);vertical-align:top}thead th{color:var(--accent);background:var(--soft);font-size:14px}thead th:first-child{border-radius:12px 0 0 0}thead th:last-child{border-radius:0 12px 0 0}tbody th{font-weight:500;width:48%}td{width:26%;color:var(--muted)}.data-note{margin-top:32px;max-width:810px}.data-note h3{font-size:20px}.data-note p{font-size:14px;margin-top:12px}.download{border-top:1px solid var(--line)}.download-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px}.download-grid article>p:not(.small-note){margin-top:16px;max-width:400px}.download-grid .button{margin-top:24px}.download-grid .small-note{margin-top:14px}.download-grid .text-link{margin-top:8px}.install-details{margin-top:36px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}details summary{cursor:pointer;font-weight:600;font-size:15px;padding:20px 24px;min-height:60px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:20px}summary::-webkit-details-marker{display:none}summary:after{content:'+';font-size:24px;line-height:1;font-weight:400;flex-shrink:0;color:var(--accent)}details[open]>summary:after{content:'−'}details summary:hover{color:var(--accent)}.install-details>div{padding:0 24px 24px;font-size:14px;color:var(--muted)}.install-details ol{padding-left:24px}.install-details li{margin-block:12px}.install-details p{margin-top:20px}.faq{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;border-top:1px solid var(--line)}.faq h2{font-size:28px;max-width:380px}.faq details{border-bottom:1px solid var(--line)}.faq summary{padding-inline:0}.faq details>p{padding:0 0 24px;font-size:14px}.site-footer{padding-block:48px;border-top:1px solid var(--line)}.site-footer p{font-size:13px;margin-top:16px}.site-footer nav{display:flex;flex-wrap:wrap;gap:24px;margin-top:24px;font-size:13px}.site-footer nav a{min-height:44px;display:flex;align-items:center;text-decoration:none}.site-footer small{display:block;color:var(--muted);font-size:11px;line-height:1.9;margin-top:20px}
@media(prefers-color-scheme:dark){:root{--bg:#0d1528;--surface:#16223b;--soft:#1d2d4b;--text:#eef3ff;--muted:#b9c9e8;--line:#435778;--accent:#a8caff;--on-accent:#08295e;--focus:#a8caff;--shadow:0 20px 56px #0004}.primary:hover{filter:brightness(1.08)}.desk-photo{filter:brightness(.83)}}
@media(max-width:960px){.wrap{width:calc(100% - 48px)}.desktop-nav{display:none}.header-inner>.button{margin-left:auto}.hero{gap:24px;min-height:570px}.hero-visual{width:260px}.hero .actions{flex-direction:column;align-items:flex-start}.hero-copy>p{font-size:16px}.feature-panel{gap:28px;padding:28px}.feature-copy h3{font-size:24px}.faq{gap:32px}.native-feature{padding:24px}.android-intro{gap:32px}}
@media(max-width:640px){html{scroll-padding-top:82px}.wrap{width:calc(100% - 40px)}.header-inner{height:68px;gap:12px}.brand{font-size:18px;gap:9px}.brand img{width:32px;height:32px}.header-inner .small{padding:9px 12px;font-size:12px;gap:8px}.section{padding-block:48px}.hero{display:flex;flex-direction:column;gap:32px;align-items:stretch;padding-top:36px;padding-bottom:40px;min-height:0}.hero h1{font-size:clamp(30px,7.8vw,44px)}.hero-copy>p{font-size:14px;line-height:1.9;margin-top:20px}.hero .actions{margin-top:24px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.hero .button{padding:12px 10px;font-size:12px;gap:8px;min-height:50px}.hero-visual{align-self:center;width:260px}.screen-shell{padding:7px;border-radius:28px}.screen-shell img{border-radius:21px}h2{font-size:28px}.section-heading p{font-size:14px;margin-top:14px}.mobile-break{display:block}.section-heading{margin-bottom:24px}.feature-tabs{grid-template-columns:1fr 1fr;gap:8px;margin-bottom:16px}.feature-tabs button{font-size:13px;padding:11px 6px;min-height:48px}.feature-panel,.wide-panel{grid-template-columns:1fr;gap:28px;padding:24px 20px;min-height:0}.feature-copy h3{font-size:23px}.feature-copy p{font-size:14px;margin-top:16px}.phone-shot{width:220px}.desktop-shot{width:100%}.desktop-shot img{border-radius:10px}.android-intro{grid-template-columns:1fr;gap:28px;margin-bottom:24px}.native-grid{grid-template-columns:1fr;gap:16px}.alarm-feature{grid-row:auto}.native-feature h3{font-size:21px}.native-feature p{font-size:14px}.native-feature{padding:24px}.alarm-feature img{width:200px}.sound-feature{grid-column:auto;display:block}.sound-feature p{margin-top:16px}.platforms h2,.download h2{font-size:25px}th,td{padding:15px 10px;font-size:12px;line-height:1.8}thead th{font-size:13px}tbody th{width:43%}td{width:28.5%}.download-grid{grid-template-columns:1fr;gap:32px}.download-grid article:first-child{padding-bottom:32px;border-bottom:1px solid var(--line)}.download-grid h3{font-size:22px}.download-grid article>p:not(.small-note){font-size:14px}.download-grid .button{width:100%}.install-details{margin-top:28px}details summary{font-size:14px;padding:18px}.install-details>div{padding:0 18px 18px}.faq{grid-template-columns:1fr;gap:20px}.faq h2{font-size:25px}.site-footer{padding-block:36px}.site-footer nav{gap:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.button:hover,.button:active{transform:none}}

/* Developer credit sits at the end of the footer. */
:root{--screen-edge:#647b82}
.footer-developer{display:flex;justify-content:flex-end;margin-top:28px}
.developer-credit{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:15px;font-weight:600;line-height:1.5;min-height:44px}
.developer-credit:hover span{text-decoration:underline}
.developer-credit img{border-radius:50%;border:1px solid var(--line)}
.developer-credit small{display:block;color:var(--muted);font-size:11px;font-weight:400;line-height:1.5;margin:0 0 3px}
.screen-shell{background:#102449;border-color:#102449}
.phone-shot img,.alarm-feature>img{border:2px solid var(--screen-edge)}
@media(prefers-color-scheme:dark){:root{--screen-edge:#8ba5d3}}
@media(max-width:640px){
  .footer-developer{justify-content:flex-start}
}
/* Layer order: screenshot stage 5, site header 20, native modal top layer. */
.walkthrough{position:relative;--guide-reading-top:120px}
.walkthrough-steps{list-style:none;margin:0;padding:0;min-width:0}
.walkthrough-step{margin-bottom:48px;scroll-margin-top:var(--guide-reading-top)}
.walkthrough-copy{max-width:470px}
.step-number{display:block;color:var(--accent);font-size:13px;font-weight:600;margin-bottom:16px}
.walkthrough-copy h3{font-size:28px}
.walkthrough-copy p{margin-top:18px;font-size:15px}
.walkthrough-copy .step-example{margin-top:24px;font-size:13px;padding-top:18px;border-top:1px solid var(--line)}
.walkthrough-shot{max-width:400px;margin:24px 0}
.screenshot-button{display:block;padding:0;border:0;border-radius:16px;background:transparent;cursor:zoom-in;color:inherit;max-width:100%}
.screenshot-button img{border:2px solid var(--screen-edge);border-radius:12px}
.walkthrough.is-enhanced{display:grid;grid-template-columns:1fr 1fr;gap:64px}
.walkthrough.is-enhanced .walkthrough-visual{grid-column:2;grid-row:1;position:sticky;top:100px;align-self:start;min-width:0}
.walkthrough.is-enhanced .walkthrough-steps{grid-column:1;grid-row:1}
.walkthrough.is-enhanced .walkthrough-step{display:flex;align-items:flex-start;min-height:max(68svh,540px);padding:40px 0;margin:0}
.walkthrough.is-enhanced .walkthrough-step>.walkthrough-shot{display:none}
.walkthrough-nav{display:flex;gap:12px;justify-content:center;margin-bottom:16px}
.walkthrough-nav button{width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--muted);cursor:pointer;font-size:15px;font-weight:600}
.walkthrough-nav button:hover{background:var(--soft)}
.walkthrough-nav button[aria-current=step]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.walkthrough-stage{position:relative;height:clamp(350px,61svh,580px);border-radius:16px;background:var(--soft);border:1px solid var(--line)}
.walkthrough-stage .walkthrough-shot{position:absolute;inset:0;max-width:none;margin:0;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(6px)}
.walkthrough-stage .walkthrough-shot.is-current{opacity:1;visibility:visible;pointer-events:auto;transform:none}
.walkthrough-stage .screenshot-button{width:100%;height:100%;padding:16px}
.walkthrough-stage picture{display:flex;align-items:center;justify-content:center;height:100%;width:100%}
.walkthrough-stage img{max-height:100%;width:auto;max-width:100%;object-fit:contain}
.walkthrough-stage figcaption{display:none}
.walkthrough-caption{text-align:center;font-size:11px;line-height:1.8;margin-top:12px}
.walkthrough-position{font-weight:600;color:var(--text)}
.walkthrough-source:before{content:' · '}
.howto-help{margin-top:28px;font-size:14px;max-width:720px}
.android-howto{border-top:1px solid var(--line)}
.android-intro .text-link{margin-top:16px}
.screenshot-dialog{width:min(760px,calc(100% - 32px));max-height:90svh;border:1px solid var(--line);border-radius:16px;padding:0 20px 20px;background:var(--surface);color:var(--text);overflow:auto}
.screenshot-dialog::backdrop{background:#071318b3}
.screenshot-dialog-heading{position:sticky;top:0;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;background:var(--surface);z-index:1}
.screenshot-dialog h2{font-size:18px;letter-spacing:0}
.screenshot-dialog-heading form{margin:0}
.screenshot-dialog-content picture,.screenshot-dialog-content img{display:block;width:100%;height:auto}
.screenshot-dialog-content img{border:2px solid var(--screen-edge);border-radius:12px}
.screenshot-dialog>p{text-align:center;font-size:11px;margin-top:16px}
html:has(.screenshot-dialog[open]){overflow:hidden}
@media(prefers-reduced-motion:no-preference){.walkthrough-stage .walkthrough-shot{transition:opacity .2s,transform .2s}}
@media(max-width:960px){.walkthrough.is-enhanced{gap:32px}.walkthrough-copy h3{font-size:24px}}
@media(max-width:640px){
  .walkthrough.is-enhanced{display:block}
  .walkthrough.is-enhanced .walkthrough-visual{top:68px;z-index:5;background:var(--bg);padding:12px 0;display:grid;grid-template-columns:84px minmax(0,1fr);grid-template-rows:auto 1fr;gap:10px 14px;align-items:start;border-bottom:1px solid var(--line)}
  .walkthrough-nav{grid-column:2;grid-row:1;display:grid;grid-template-columns:repeat(var(--guide-count,4),minmax(0,1fr));gap:5px;justify-content:start;margin-bottom:0}
  .walkthrough-nav button{width:100%;height:44px;font-size:14px;border-radius:10px}
  .walkthrough-stage{grid-column:1;grid-row:1/span 2;height:clamp(116px,17svh,148px);background:transparent;border:0;border-radius:0}
  .walkthrough-stage .screenshot-button{padding:0;min-height:44px}
  .walkthrough-stage img{border-radius:7px}
  .walkthrough-caption{grid-column:2;grid-row:2;margin:0;text-align:left;font-size:11px;line-height:1.85}
  .walkthrough-source{display:block;font-size:10px}
  .walkthrough-source:before{content:none}
  .walkthrough-caption br{display:none}
  .walkthrough.is-enhanced .walkthrough-step{min-height:max(55svh,360px);padding:32px 0;align-items:flex-start}
  .walkthrough-copy h3{font-size:22px}
  .walkthrough-copy p{font-size:14px;margin-top:14px}
  .walkthrough-copy .step-example{font-size:12px;margin-top:20px;padding-top:14px}
  .step-number{margin-bottom:12px;font-size:12px}
  .screenshot-dialog{padding:0 12px 16px}
  .screenshot-dialog h2{font-size:15px}
  .howto-help{font-size:13px}
}
@media(max-width:640px) and (max-height:650px){
  .walkthrough-stage{height:110px}
  .walkthrough.is-enhanced .walkthrough-step{min-height:410px}
}
@media(min-width:641px) and (max-height:650px){
  .walkthrough.is-enhanced .walkthrough-visual{top:88px}
  .walkthrough-stage{height:clamp(150px,42svh,250px)}
}

.release-update{border-top:1px solid var(--line);padding-block:40px}.release-update h2{font-size:26px}.release-update p{margin-top:16px;max-width:800px}.checklist-shot{margin-top:24px;max-width:300px;border:1px solid var(--line);border-radius:16px}.product-banner{background:var(--soft)}