:root{color-scheme:light dark;--paper:#f5f0e0;--card:#fffdf5;--ink:#1f1c19;--muted:#62594f;--vermilion:#b0291f;--line:rgba(31,28,25,.14);--shadow:0 24px 70px rgba(63,42,28,.12);--radius:22px;--serif:Iowan Old Style,Palatino Linotype,YuMincho,Yu Mincho,Hiragino Mincho ProN,Georgia,serif;--sans:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 92% 2%,rgba(176,41,31,.09),transparent 22rem),linear-gradient(rgba(31,28,25,.025) 1px,transparent 1px),var(--paper);background-size:auto,100% 32px,auto;font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit}a:hover{color:var(--vermilion)}img{display:block;max-width:100%}.shell{width:min(1160px,calc(100% - 40px));margin-inline:auto}.skip-link{position:absolute;z-index:100;top:-5rem;left:1rem;padding:.7rem 1rem;border-radius:.6rem;color:#fff;background:var(--vermilion)}.skip-link:focus{top:1rem}
.site-header{position:sticky;z-index:20;top:0;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(18px)}.nav{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:2rem}.brand{display:inline-flex;align-items:center;gap:.8rem;color:var(--ink);font-family:var(--serif);font-size:1.12rem;font-weight:700;text-decoration:none}.brand img{width:36px;height:36px;border-radius:9px}.brand small{color:var(--muted);font-family:var(--sans);font-size:.68rem;font-weight:650;letter-spacing:.14em;text-transform:uppercase}.brand-text{display:grid;line-height:1.05}.nav-links{display:flex;align-items:center;gap:1.5rem}.nav-links a{color:var(--muted);font-size:.9rem;font-weight:650;text-decoration:none}.nav-links a[aria-current=page]{color:var(--vermilion)}.nav-links .nav-cta{padding:.55rem .85rem;border:1px solid var(--ink);border-radius:999px;color:var(--ink)}
.hero{min-height:min(820px,calc(100vh - 74px));display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:clamp(3rem,8vw,7rem);padding-block:6rem}.eyebrow,.section-kicker{margin:0 0 1rem;color:var(--vermilion);font-size:.73rem;font-weight:800;letter-spacing:.18em;text-transform:uppercase}h1,h2,h3{margin:0;font-family:var(--serif);line-height:1.08}h1{max-width:760px;font-size:clamp(3.45rem,7.2vw,6.8rem);letter-spacing:-.055em}h2{font-size:clamp(2.35rem,4.5vw,4rem);letter-spacing:-.035em}h3{font-size:1.35rem}.lead{max-width:640px;margin:1.7rem 0 0;color:var(--muted);font-size:clamp(1.07rem,2vw,1.25rem)}.actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:2rem}.button{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:48px;padding:.75rem 1.05rem;border:1px solid var(--ink);border-radius:12px;font-weight:750;text-decoration:none}.button.primary{border-color:var(--vermilion);color:#fff;background:var(--vermilion)}.button:hover{transform:translateY(-1px)}
.hero-art{position:relative;display:grid;place-items:center;min-height:510px}.hero-art::before{content:"深める";position:absolute;right:0;color:rgba(176,41,31,.09);font-family:var(--serif);font-size:clamp(5rem,12vw,10rem);letter-spacing:-.18em;writing-mode:vertical-rl}.app-icon{z-index:2;width:min(360px,78vw);border-radius:22%;box-shadow:var(--shadow);transform:rotate(2.5deg)}.stamp{position:absolute;z-index:3;right:6%;bottom:8%;display:grid;width:88px;height:88px;place-items:center;border:2px solid var(--vermilion);color:var(--vermilion);font-family:var(--serif);font-size:1.45rem;font-weight:700;transform:rotate(-8deg)}
.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line)}.trust-strip div{padding:1.4rem;text-align:center}.trust-strip div+div{border-left:1px solid var(--line)}.trust-strip strong{display:block;font-family:var(--serif);font-size:1.1rem}.trust-strip span{color:var(--muted);font-size:.8rem}.section{padding-block:clamp(5rem,10vw,8.5rem)}.section-heading{max-width:740px}.section-heading p{max-width:610px;margin:1.2rem 0 0;color:var(--muted);font-size:1.06rem}.workflow{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem;margin-top:3rem;counter-reset:steps}.step{min-height:280px;padding:1.7rem;border:1px solid var(--line);border-radius:var(--radius);background:color-mix(in srgb,var(--card) 75%,transparent);counter-increment:steps}.step::before{content:"0" counter(steps);display:block;margin-bottom:3.8rem;color:var(--vermilion);font-family:ui-monospace,monospace;font-size:.82rem;font-weight:800}.step p{margin:.8rem 0 0;color:var(--muted)}
.feature-band{overflow:hidden;color:#fffaf1;background:var(--ink)}.feature-band .section-kicker{color:#e95b4c}.feature-grid{display:grid;grid-template-columns:1fr 1fr;align-items:start;gap:clamp(3rem,8vw,7rem)}.feature-list{display:grid;gap:1px;border-block:1px solid rgba(255,255,255,.16)}.feature{padding:1.5rem 0;border-bottom:1px solid rgba(255,255,255,.16)}.feature:last-child{border:0}.feature p{margin:.5rem 0 0;color:#c9c0b6}.feature-no{float:right;color:#e95b4c;font-family:ui-monospace,monospace;font-size:.78rem}.privacy-callout{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2rem;padding:clamp(2rem,5vw,4rem);border:1px solid var(--line);border-radius:calc(var(--radius)*1.3);background:var(--card);box-shadow:var(--shadow)}.privacy-callout p{max-width:660px;margin:.8rem 0 0;color:var(--muted)}.privacy-mark{display:grid;width:110px;height:110px;place-items:center;border:1px solid var(--vermilion);border-radius:50%;color:var(--vermilion);font-family:var(--serif);font-size:2rem}
.page-hero{padding-block:6rem 3rem;border-bottom:1px solid var(--line)}.page-hero h1{max-width:900px;font-size:clamp(3.2rem,7vw,6rem)}.page-hero .lead{max-width:760px}.meta{margin-top:1.4rem;color:var(--muted);font-size:.83rem}.prose-wrap{display:grid;grid-template-columns:220px minmax(0,720px);gap:clamp(2.5rem,7vw,6rem);padding-block:4.5rem 7rem}.toc{position:sticky;top:110px;align-self:start;display:grid;gap:.55rem}.toc a{color:var(--muted);font-size:.82rem;text-decoration:none}.toc a:hover{color:var(--vermilion)}.prose section{margin-bottom:3.4rem;scroll-margin-top:100px}.prose h2{margin-bottom:1rem;font-size:clamp(1.9rem,4vw,2.7rem)}.prose h3{margin-top:1.8rem}.prose p,.prose li{color:var(--muted)}.prose ul{padding-left:1.2rem}.prose a{color:var(--vermilion);text-underline-offset:.18em}.note{padding:1.25rem 1.35rem;border-left:3px solid var(--vermilion);background:rgba(176,41,31,.07)}.support-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin:2rem 0 3.5rem}.support-card{padding:1.5rem;border:1px solid var(--line);border-radius:16px;background:var(--card)}.support-card p{margin-bottom:0}.faq details{padding:1.2rem 0;border-top:1px solid var(--line)}.faq summary{cursor:pointer;font-family:var(--serif);font-size:1.15rem;font-weight:700}
.site-footer{padding-block:3rem;border-top:1px solid var(--line)}.footer-grid{display:flex;align-items:flex-end;justify-content:space-between;gap:2rem}.footer-grid p{max-width:480px;margin:.45rem 0 0;color:var(--muted);font-size:.84rem}.footer-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:1rem}.footer-links a{color:var(--muted);font-size:.84rem;font-weight:650;text-decoration:none}
@media(prefers-color-scheme:dark){:root{--paper:#171412;--card:#29231f;--ink:#f2eadb;--muted:#b8ab9b;--vermilion:#ed5c48;--line:rgba(242,234,219,.14);--shadow:0 24px 70px rgba(0,0,0,.35)}}
@media(max-width:800px){.shell{width:min(100% - 28px,680px)}.nav{min-height:66px}.brand small{display:none}.nav-links{gap:.75rem}.nav-links a:not(.nav-cta){display:none}.hero{min-height:0;grid-template-columns:1fr;gap:3rem;padding-block:4rem}.hero-art{min-height:390px;order:-1}.app-icon{width:min(270px,72vw)}.trust-strip{grid-template-columns:1fr}.trust-strip div+div{border-top:1px solid var(--line);border-left:0}.workflow,.feature-grid,.support-grid{grid-template-columns:1fr}.step{min-height:230px}.privacy-callout{grid-template-columns:1fr}.privacy-mark{width:80px;height:80px}.prose-wrap{grid-template-columns:1fr}.toc{position:static;padding-bottom:1.5rem;border-bottom:1px solid var(--line)}.footer-grid{display:grid;align-items:start}.footer-links{justify-content:flex-start}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}