:root{
  --washi:#f6f2e9; --paper:#fffdf8; --ink:#171922; --ink2:#555249; --line:#e0d7c6;
  --indigo:#1f2a6b; --indigo-deep:#141b4a; --gold:#b08a3c; --hanko:#c0392b; --lavender:#7c89cc;
  --btn:#1f2a6b; --btn-ink:#fff; --shadow:0 24px 50px -22px rgba(20,27,74,.45), 0 6px 14px -8px rgba(20,27,74,.3);
  --serif:ui-serif,"Iowan Old Style","Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",Georgia,serif;
  --kanji:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",ui-serif,serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}
@media(prefers-color-scheme:dark){:root{
  --washi:#0d0f17; --paper:#161a27; --ink:#f2efe7; --ink2:#aaa79d; --line:#262b3a;
  --indigo:#8e9bff; --gold:#d9b865; --hanko:#e2574a; --btn:#f2efe7; --btn-ink:#141b4a;
  --shadow:0 24px 50px -22px rgba(0,0,0,.8), 0 6px 14px -8px rgba(0,0,0,.6);
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:clip}body{overflow-x:clip}
body{margin:0;background:var(--washi);color:var(--ink);font:17px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit}
:focus-visible{outline:3px solid var(--lavender);outline-offset:3px;border-radius:6px}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;padding:22px 0}
.brand{white-space:nowrap;display:flex;align-items:center;gap:12px;text-decoration:none;font:700 21px var(--serif)}
.hanko{width:36px;height:36px;border-radius:7px;background:var(--hanko);color:#fff;display:grid;place-items:center;font:700 21px var(--kanji);transform:rotate(-4deg);box-shadow:inset 0 0 0 2px rgba(255,255,255,.28)}
.top nav a{margin-left:22px;text-decoration:none;color:var(--ink2);font-size:15px}
.top nav a:hover{color:var(--ink)}

/* hero */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding:36px 0 84px}
h1{font:700 clamp(40px,6.2vw,68px)/1.04 var(--serif);letter-spacing:-.02em;margin:0 0 20px}
.lead{font-size:20px;color:var(--ink2);max-width:34em;margin:0 0 28px}
.cta-row{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--btn);color:var(--btn-ink);text-decoration:none;font-weight:600;padding:15px 26px;border-radius:999px;box-shadow:var(--shadow);transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn svg{width:20px;height:20px;fill:currentColor}
.note{color:var(--ink2);font-size:15px}
.levels{display:flex;gap:8px;margin-top:30px;flex-wrap:wrap}
.levels span{border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:5px 14px;font:600 14px var(--sans);color:var(--ink2)}

/* the flip card */
.deck{perspective:1400px;justify-self:center;width:min(100%,400px)}
.flip{position:relative;display:block;width:100%;aspect-ratio:4/5;border:0;padding:0;background:none;cursor:pointer;transform-style:preserve-3d;transition:transform .8s cubic-bezier(.3,.7,.2,1);font:inherit;color:inherit;text-align:left}
.flip.is-flipped{transform:rotateY(180deg)}
.face{position:absolute;inset:0;border-radius:26px;backface-visibility:hidden;-webkit-backface-visibility:hidden;overflow:hidden;
  background:linear-gradient(160deg,#fffdf8 0%,#f4eee0 100%);border:1.5px solid #8a7e66;box-shadow:var(--shadow);color:#171922}
.face::before{content:"";position:absolute;left:0;right:0;top:0;height:5px;background:linear-gradient(90deg,#b08a3c,#e6cf8e,#b08a3c)}
@media(prefers-color-scheme:dark){.face{background:linear-gradient(160deg,#1b2033 0%,#141827 100%);border-color:#6b7391;color:#f2efe7}}
.front{display:grid;place-items:center;text-align:center;padding:28px}
.front .k{font:700 clamp(150px,22vw,230px)/1 var(--kanji)}
.front .r{font:400 28px var(--kanji);color:var(--ink2);margin-top:6px}
.front .tap{position:absolute;bottom:20px;left:0;right:0;font-size:14px;color:var(--ink2)}
.back{transform:rotateY(180deg);padding:30px 28px;display:flex;flex-direction:column;gap:10px}
.back .m{font:700 30px var(--serif)}
.back .lv{display:inline-block;background:var(--indigo);color:#fff;border-radius:6px;padding:2px 10px;font:700 13px var(--sans);margin-left:10px;vertical-align:middle}
@media(prefers-color-scheme:dark){.back .lv{color:#141b4a}}
.back .row{color:var(--ink2);font-size:18px}
.back .row b{font:700 17px var(--kanji);color:var(--ink);margin-right:10px}
.back ul{list-style:none;margin:8px 0 0;padding:0;display:grid;gap:6px}
.back li{font-size:17px}
.back li .w{font:700 21px var(--kanji);margin-right:8px}
.back li .y{color:var(--indigo);font-size:15px;margin-right:8px}
.back li .e{color:var(--ink2);font-size:15px}
.dots{display:flex;justify-content:center;gap:8px;margin-top:22px}
.dots i{width:8px;height:8px;border-radius:50%;background:var(--line);transition:background .3s,transform .3s}
.dots i.on{background:var(--hanko);transform:scale(1.3)}

/* sections row */
.rail{border-block:1px solid var(--line);padding:18px 0;overflow:hidden}
.pills{display:flex;gap:10px;overflow-x:auto;scrollbar-width:none;padding:2px 24px;justify-content:center;flex-wrap:wrap}
.pills span{white-space:nowrap;border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:8px 18px;font-weight:600;font-size:15px;color:var(--ink2)}
.pills span:first-child{background:linear-gradient(135deg,#2a3590,#141b4a);color:#fff;border-color:transparent}

/* showcase rows */
.show{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding:88px 0}
.show.flip-row .copy{order:2}
h2{font:700 clamp(30px,4.2vw,44px)/1.1 var(--serif);letter-spacing:-.015em;margin:0 0 14px}
.copy p{color:var(--ink2);font-size:18px;max-width:30em;margin:0 0 12px}
.copy ul{margin:16px 0 0;padding:0;list-style:none;display:grid;gap:8px}
.copy li{padding-left:22px;position:relative;color:var(--ink2)}
.copy li::before{content:"";position:absolute;left:0;top:.68em;width:10px;height:2px;background:var(--gold)}

/* phones */
.phone{justify-self:center;width:min(100%,290px);aspect-ratio:9/18;border-radius:44px;background:#0c0e16;padding:10px;box-shadow:var(--shadow);position:relative}
.screen{position:relative;width:100%;height:100%;border-radius:35px;overflow:hidden;background:#f6f2e9;color:#171922;padding:18px 14px 14px;display:flex;flex-direction:column;gap:12px;font-size:13px}
.screen img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:2;background:#f6f2e9}
.island{height:20px;width:76px;border-radius:12px;background:#0c0e16;margin:-4px auto 2px;flex:none}
.sp{display:flex;gap:6px;overflow:hidden;flex:none}
.sp b{white-space:nowrap;border:1px solid #e0d7c6;background:#fffdf8;border-radius:999px;padding:5px 11px;font-weight:600;font-size:11px;color:#555249}
.sp b.on{background:linear-gradient(135deg,#2a3590,#141b4a);color:#fff;border-color:transparent}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:9px;flex:1;align-content:start}
.tile{background:linear-gradient(160deg,#fffdf8,#f4eee0);border:1.5px solid #8a7e66;border-radius:14px;aspect-ratio:1;display:grid;place-items:center;position:relative;overflow:hidden;font:700 46px var(--kanji)}
.tile::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,#b08a3c,#e6cf8e,#b08a3c)}
.tile small{position:absolute;bottom:7px;left:0;right:0;text-align:center;font:600 10px var(--sans);color:#555249}
.q{background:linear-gradient(160deg,#fffdf8,#f4eee0);border:1.5px solid #8a7e66;border-radius:16px;padding:18px 14px;text-align:center}
.q .jp{font:700 24px var(--kanji);margin:6px 0}
.q .hint{color:#555249;font-size:12px}
.blank{display:inline-block;min-width:34px;border-bottom:2px solid #b08a3c;color:#c0392b}
.opts{display:grid;gap:8px}
.opts b{display:block;background:#fffdf8;border:1.5px solid #e0d7c6;border-radius:12px;padding:11px;text-align:center;font:700 18px var(--kanji)}
.opts b.ok{border-color:#2f8f5b;background:#e8f6ee;color:#1d6b40}
.blocks{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}
.blocks b{background:#1f2a6b;color:#fff;border-radius:9px;padding:7px 11px;font:600 15px var(--kanji)}
.path{display:grid;gap:9px}
.step{display:flex;align-items:center;gap:11px;background:#fffdf8;border:1px solid #e0d7c6;border-radius:13px;padding:11px 12px}
.step i{flex:none;width:24px;height:24px;border-radius:50%;border:2px solid #cfc5ae;display:grid;place-items:center;font-style:normal;font-size:12px;color:#fff}
.step.done i{background:#2f8f5b;border-color:#2f8f5b}
.step.now{border-color:#1f2a6b;box-shadow:0 0 0 2px rgba(31,42,107,.14)}
.step.now i{border-color:#1f2a6b}
.step span{font-weight:600;font-size:13px}.step em{display:block;font-style:normal;font-weight:400;color:#555249;font-size:11px}

/* standby */
.standby{background:var(--lavender);color:#10143a;border-radius:36px;margin:24px auto 0;padding:72px 56px;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;overflow:hidden}
.standby h2{color:#10143a}
.standby p{color:#1d2257;font-size:18px;max-width:28em;margin:0 0 12px}
.stand{justify-self:center;width:min(100%,440px);transform:rotate(-2.5deg)}
.stand .deck{width:100%}
.stand .flip{aspect-ratio:1.3}
.stand .front .k{font-size:clamp(100px,15vw,150px)}
.stand .back{gap:8px;padding:24px}
.stand figcaption{margin-top:18px;text-align:center;font-size:14px;color:#1d2257;transform:rotate(2.5deg)}
.themes{display:flex;gap:12px;margin-top:22px}
.themes i{width:34px;height:34px;border-radius:50%;border:2px solid rgba(255,255,255,.7);box-shadow:0 3px 8px -3px rgba(16,20,58,.5)}

/* final */
.final{text-align:center;padding:110px 0 90px}
.final h2{margin-bottom:10px}
.final p{color:var(--ink2);margin:0 0 28px;font-size:19px}
footer{border-top:1px solid var(--line);padding:26px 0 40px;color:var(--ink2);font-size:14px}
footer .wrap{display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between}
footer a{text-decoration:none;margin-right:16px}footer a:hover{color:var(--ink)}

@media(max-width:860px){
  .hero,.show,.standby{grid-template-columns:1fr;gap:40px}
  .hero{padding:12px 0 56px}
  .show{padding:56px 0}.show.flip-row .copy{order:0}
  .standby{padding:48px 24px;border-radius:28px}
  .pills{justify-content:flex-start}
  .phone{width:min(100%,250px)}
  .hero{position:relative}
.hero::before{display:none}
}
@media(max-width:520px){.top nav a:first-child{display:none}.top nav a{margin-left:16px}}
@media(prefers-reduced-motion:reduce){.flip{transition:none}.btn{transition:none}html{scroll-behavior:auto}}

.bar{height:6px;border-radius:3px;background:#e0d7c6;flex:none;overflow:hidden}.bar i{display:block;height:100%;background:linear-gradient(90deg,#b08a3c,#e6cf8e)}
.hint2{text-align:center;color:#555249;font-size:12px}
.sent{margin-top:auto;border-top:1px solid var(--line);padding-top:12px;display:grid;gap:2px}
.sent span{font:700 20px var(--kanji)}.sent small{color:var(--ink2);font-size:14px}
.stand .sent span{font-size:17px}
.hero::before{content:"";position:absolute;right:-8%;top:-4%;width:58%;aspect-ratio:1;background:radial-gradient(closest-side,rgba(124,137,204,.28),rgba(124,137,204,0));z-index:-1;pointer-events:none}
.pills span{transition:transform .15s}

/* hero: a physical stack of cards */
.hero-deck{position:relative;justify-self:center;width:min(100%,400px);aspect-ratio:4/5;cursor:pointer;border-radius:26px}
.hero-deck .slot{position:absolute;inset:0;perspective:1400px;transition:transform .6s cubic-bezier(.3,.7,.2,1);will-change:transform}
.hero-deck .flip{position:absolute;inset:0;width:100%;height:100%;aspect-ratio:auto}
.slot.p0{transform:none;z-index:4}
.slot.p1{transform:translate(14px,8px) rotate(4deg);z-index:3}
.slot.p2{transform:translate(-12px,12px) rotate(-3.5deg);z-index:2}
.slot.p3{transform:translate(8px,18px) rotate(2deg);z-index:1}
.slot.toss{transform:translate(82%,-8%) rotate(15deg);z-index:5;transition-duration:.5s;transition-timing-function:cubic-bezier(.5,0,.8,.6)}
@media(prefers-reduced-motion:reduce){.hero-deck .slot{transition:none}}