:root{--content-max:1200px;--side-gap:clamp(16px,5vw,40px);--bg:#ffffff;--text:#0a0a0a;--muted:#6b7280;--line:#e5e7eb;--card:#f7f7f8;--shadow:0 10px 30px rgba(0,0,0,.05),0 2px 8px rgba(0,0,0,.06);--radius:18px;--brand:#111111}@media (prefers-color-scheme:dark){:root{--bg:#0b0b0c;--text:#f5f5f7;--muted:#b0b2b8;--line:#2a2b31;--card:#111214;--shadow:0 18px 40px rgba(0,0,0,.45),0 2px 10px rgba(0,0,0,.35);--brand:#f5f5f7}}*{box-sizing:border-box}body,html{height:100%}body.app{margin:0;color:var(--text);background:var(--bg);font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,SF Pro Text,SF Pro Display,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans JP,Hiragino Kaku Gothic ProN,Meiryo,sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}.container{max-width:var(--content-max);width:100%;padding-left:max(var(--side-gap),env(safe-area-inset-left));padding-right:max(var(--side-gap),env(safe-area-inset-right));margin-inline:auto;overflow-x:hidden}:where(button,[role=button],input,textarea):focus-visible{outline:2px solid rgba(0,0,0,.85);outline-offset:2px}@media (prefers-color-scheme:dark){:where(button,[role=button],input,textarea):focus-visible{outline-color:rgba(255,255,255,.9)}}.device{aspect-ratio:9/19.5;width:clamp(280px,min(92vw,calc(.461538 * 80vh)),420px);justify-self:center;--bezel:clamp(6px,1.8vw,10px);--radius-bezel:clamp(26px,6vw,38px);--radius-screen:calc(var(--radius-bezel) - max(10px, 1.6vw));--island-w:clamp(64px,24%,104px);--island-h:clamp(10px,3.8vw,20px)}.device__bezel{position:relative;width:100%;height:100%;border-radius:var(--radius-bezel);background:linear-gradient(160deg,#1f1f1f,#0d0d0d);border:1px solid rgba(255,255,255,.05);box-shadow:0 18px 50px rgba(0,0,0,.22),0 3px 8px rgba(0,0,0,.16);overflow:hidden}.device__screen{position:absolute;inset:var(--bezel);border-radius:var(--radius-screen);overflow:hidden;background:#000;z-index:1}.device__img,.device__screen img{width:100%;height:100%;display:block;object-fit:cover;object-position:50% 35%;filter:grayscale(100%)}.device__island{position:absolute;left:50%;top:calc(var(--bezel) - 1px);width:var(--island-w);height:var(--island-h);transform:translateX(-50%);background:#000;border-bottom-left-radius:14px;border-bottom-right-radius:14px;box-shadow:0 2px 5px rgba(0,0,0,.35);z-index:2}@media (max-width:480px){.device{width:min(94vw,calc(.461538 * 86vh))}}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;-webkit-backdrop-filter:saturate(180%) blur(8px);backdrop-filter:saturate(180%) blur(8px);background:color-mix(in srgb,var(--bg) 85%,transparent);border-bottom:1px solid var(--line)}.site-header__inner{display:grid;grid-template-columns:1fr auto;align-items:center;height:56px;grid-gap:16px;gap:16px}.brand{font-weight:700;letter-spacing:-.01em}.tagline{color:var(--muted);font-size:13px}.site-footer{padding:48px 0;border-top:1px solid var(--line);margin-top:64px}.legal{color:var(--muted);font-size:12px;text-align:center}.page-stack{display:grid;grid-gap:clamp(24px,4vw,56px);gap:clamp(24px,4vw,56px)}.hero{display:grid;grid-template-columns:minmax(320px,1.2fr) minmax(280px,1fr);align-items:center;grid-gap:clamp(24px,6vw,96px);gap:clamp(24px,6vw,96px);padding:clamp(12px,3vw,24px) 0 0}@media (max-width:920px){.hero{grid-template-columns:1fr}.device{order:-1;justify-self:center}}.hero__title{margin:0 0 18px;font-weight:800;font-size:clamp(28px,5.6vw,58px);letter-spacing:-.02em;line-height:1.08}.prompt{background:linear-gradient(180deg,rgba(255,255,255,.85),rgba(255,255,255,.75));-webkit-backdrop-filter:saturate(180%) blur(10px);backdrop-filter:saturate(180%) blur(10px);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}@media (prefers-color-scheme:dark){.prompt{background:linear-gradient(180deg,rgba(25,26,28,.8),rgba(25,26,28,.7))}}.prompt__label{display:block;font-size:13px;color:var(--muted);margin-bottom:8px}.prompt__textarea{width:100%;min-height:170px;resize:vertical;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:16px;line-height:1.7;background:var(--bg);color:var(--text)}.prompt__actions{display:flex;align-items:center;gap:12px;margin-top:10px}.prompt__actions button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;border-radius:12px;padding:12px 18px;font-weight:700;color:#fff;background:linear-gradient(180deg,#1a1a1a,#000);box-shadow:inset 0 1px 0 rgba(255,255,255,.15),0 8px 20px rgba(0,0,0,.18);cursor:pointer;transition:transform .06s ease,filter .2s ease}.prompt__actions button:hover{filter:brightness(1.05)}.prompt__actions button:active{transform:translateY(1px)}.prompt__actions button:disabled{opacity:.6;cursor:not-allowed}.prompt__hint{color:var(--muted);font-size:12px}.chat{margin-top:clamp(8px,1vw,12px)}.chat-card{background:var(--card);border:1px solid var(--line);border-radius:calc(var(--radius) + 4px);padding:clamp(12px,2vw,18px);box-shadow:var(--shadow);min-height:240px}.msg{margin:12px 0}.msg__meta{margin-bottom:4px;display:flex;align-items:baseline;gap:8px}.msg__label{font-weight:700;letter-spacing:-.01em}.msg--user .msg__label{color:var(--brand)}.msg--ai .msg__label{color:#2563eb}.msg__body{white-space:pre-wrap;font-size:16px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);-webkit-clip-path:inset(50%);clip-path:inset(50%);white-space:nowrap;border:0}@media (max-width:920px){.hero{grid-template-columns:1fr;justify-items:center;gap:clamp(16px,4.5vw,28px);padding-top:clamp(8px,2.5vw,16px)}.hero__copy{width:100%}}.hero__title{font-size:clamp(22px,7vw,32px);line-height:1.18;letter-spacing:-.01em;word-break:keep-all}