/* ===== Yonkumi Landing Page ===== */
:root{
  --cream:#FAF6EE; --ink:#2E2B27; --muted:#9A9389;
  --tile:#F6EAC9; --card:#FFFFFF; --hairline:#ECE5D6;
  --yellow:#FDD877; --green:#ACD88B; --blue:#9AC1EE; --purple:#C5A8E2;
  --yellow-d:#F4C44A; --link:#5C9BD6;
  --shadow:0 14px 34px rgba(120,105,70,.12);
  --shadow-sm:0 6px 16px rgba(120,105,70,.10);
  --radius:22px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Zen Maru Gothic","Hiragino Maru Gothic ProN","Yu Gothic",system-ui,sans-serif;
  color:var(--ink); background:var(--cream); line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 24px}
.c-y{color:var(--yellow-d)} .c-b{color:var(--blue)} .c-link{color:var(--link)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5em;font-weight:700;cursor:pointer;border:none}
.btn-pill{background:var(--yellow);color:var(--ink);padding:.6em 1.4em;border-radius:999px;font-size:.95rem;box-shadow:var(--shadow-sm)}
.btn-pill:hover{background:var(--yellow-d)}
.btn-cta{background:linear-gradient(180deg,#FEE08C,#FBCB57);color:#7a5a14;font-size:1.25rem;font-weight:900;
  padding:.85em 1.6em;border-radius:999px;box-shadow:0 10px 24px rgba(244,196,74,.45)}
.btn-cta:hover{transform:translateY(-2px)}
.btn-cta .play-tri{font-size:.8em}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(250,246,238,.88);backdrop-filter:blur(8px);border-bottom:1px solid var(--hairline)}
.header-inner{display:flex;align-items:center;gap:24px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.4rem}
.brand-grid{display:grid;grid-template-columns:repeat(2,1fr);grid-auto-rows:1fr;gap:2px;width:30px;height:30px;
  padding:3px;background:#fff;border-radius:8px;box-shadow:var(--shadow-sm)}
.brand-grid i{border-radius:3px}
.nav{margin-left:auto;display:flex;gap:26px;font-weight:700;color:#5d564d}
.nav a:hover{color:var(--ink)}
.site-header .btn-pill{margin-left:8px}

/* hero */
.hero{position:relative;overflow:hidden;padding:60px 0 40px}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;position:relative;z-index:2}
.hero-kicker{font-size:1.7rem;font-weight:900}
.hero-title{font-size:5.2rem;font-weight:900;letter-spacing:.04em;line-height:1.05;margin:.1em 0 .3em}
.name-meaning{font-size:1.2rem;font-weight:700;color:#6d665b;margin:.15em 0 .55em}
.name-meaning ruby rt{font-size:.7em;color:var(--yellow-d);font-weight:900;letter-spacing:0}
.name-meaning b{color:var(--ink);background:linear-gradient(transparent 58%,#FDE49A 58%);padding:0 .12em}
.hero-lead{font-size:1.5rem;font-weight:700;margin-bottom:1.4em}
.badges{display:flex;gap:14px;margin-top:18px;flex-wrap:wrap}
.badges.center{justify-content:center}
.badge{display:inline-flex;align-items:center;gap:9px;background:#1b1b1b;color:#fff;border-radius:12px;padding:9px 16px}
.badge:hover{background:#000}
.badge-ico{width:24px;height:24px}
.badge span{display:flex;flex-direction:column;line-height:1.15}
.badge small{font-size:.62rem;opacity:.85}
.badge strong{font-size:1.05rem}

/* hero visual / phone */
.hero-visual{position:relative;display:flex;justify-content:center;padding-right:40px}
.phone{width:300px;background:#EFE7D6;border-radius:42px;padding:14px;box-shadow:var(--shadow);position:relative;z-index:2}
.phone-notch{position:absolute;top:14px;left:50%;transform:translateX(-50%);width:120px;height:22px;background:#EFE7D6;border-radius:0 0 16px 16px;z-index:3}
.phone-screen{background:var(--cream);border-radius:30px;padding:18px 16px 16px;overflow:hidden}
.game-top{display:flex;align-items:center;gap:6px;margin-bottom:14px}
.game-top .g-ico{color:#8a8276;font-size:1.1rem}
.g-title{margin:0 auto;text-align:center}
.g-title strong{display:block;font-size:1.05rem}
.g-title small{color:var(--muted);font-size:.78rem}
.board{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.t{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:12px;
  font-weight:700;font-size:1.5rem;background:var(--tile);color:var(--ink);box-shadow:0 3px 0 rgba(0,0,0,.06)}
.t.y{background:var(--yellow)} .t.g{background:var(--green)} .t.b{background:var(--blue)} .t.p{background:var(--purple)}
.g-rule{text-align:center;font-weight:700;margin-top:14px}
.g-sub{text-align:center;color:var(--muted);font-size:.82rem}
.g-actions{display:flex;justify-content:space-between;gap:6px;margin-top:14px}
.g-btn{flex:1;text-align:center;font-size:.72rem;font-weight:700;color:#6d665b;background:#fff;border:1px solid var(--hairline);border-radius:999px;padding:7px 4px}
.g-btn b{color:var(--ink)}

.mascot-hero{position:absolute;right:-58px;bottom:-14px;width:210px;z-index:1;filter:drop-shadow(0 12px 18px rgba(120,105,70,.18))}
.speech{position:absolute;right:-18px;top:18px;background:#fff;border-radius:18px;padding:14px 18px;font-weight:700;
  font-size:.95rem;text-align:center;box-shadow:var(--shadow-sm)}
.speech::after{content:"";position:absolute;left:-8px;top:30px;border:8px solid transparent;border-right-color:#fff}

/* ===== 背景: ゆっくり浮遊するパステルの丸 ===== */
.bg-decor{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}
.bubble{position:absolute;border-radius:50%;opacity:.5;will-change:transform}
/* サイズ・色・位置 */
.bubble:nth-child(1){width:300px;height:300px;background:#FCE7AE;top:-4%;left:-5%}
.bubble:nth-child(2){width:200px;height:200px;background:#DCEFC8;top:8%;right:-3%}
.bubble:nth-child(3){width:150px;height:150px;background:#DCE8F8;top:42%;left:6%}
.bubble:nth-child(4){width:240px;height:240px;background:#ECDDF4;top:60%;right:4%}
.bubble:nth-child(5){width:120px;height:120px;background:#FAE0CC;top:30%;left:44%}
.bubble:nth-child(6){width:180px;height:180px;background:#FCEFC0;bottom:6%;left:-3%}
.bubble:nth-child(7){width:130px;height:130px;background:#DCE8F8;bottom:18%;right:38%}
.bubble:nth-child(8){width:220px;height:220px;background:#E4F1D6;top:78%;left:30%}
.bubble:nth-child(9){width:110px;height:110px;background:#ECDDF4;top:18%;left:24%}
.bubble:nth-child(10){width:160px;height:160px;background:#FCE7AE;top:50%;right:24%}
.bubble:nth-child(11){width:140px;height:140px;background:#DCEFC8;top:88%;right:8%}
.bubble:nth-child(12){width:170px;height:170px;background:#DCE8F8;top:4%;left:52%}
/* それぞれ違う経路・速さでゆっくり巡回(desyncは負のdelay) */
.bubble:nth-child(1){animation:drift-a 34s ease-in-out -2s infinite}
.bubble:nth-child(2){animation:drift-b 41s ease-in-out -8s infinite}
.bubble:nth-child(3){animation:drift-c 29s ease-in-out -5s infinite}
.bubble:nth-child(4){animation:drift-a 46s ease-in-out -14s infinite}
.bubble:nth-child(5){animation:drift-b 31s ease-in-out -3s infinite}
.bubble:nth-child(6){animation:drift-c 39s ease-in-out -11s infinite}
.bubble:nth-child(7){animation:drift-a 27s ease-in-out -7s infinite}
.bubble:nth-child(8){animation:drift-b 44s ease-in-out -19s infinite}
.bubble:nth-child(9){animation:drift-c 33s ease-in-out -1s infinite}
.bubble:nth-child(10){animation:drift-a 37s ease-in-out -13s infinite}
.bubble:nth-child(11){animation:drift-b 30s ease-in-out -6s infinite}
.bubble:nth-child(12){animation:drift-c 42s ease-in-out -16s infinite}
@keyframes drift-a{
  0%{transform:translate(0,0) scale(1)}
  25%{transform:translate(40px,-32px) scale(1.05)}
  50%{transform:translate(-24px,24px) scale(.97)}
  75%{transform:translate(-44px,-18px) scale(1.03)}
  100%{transform:translate(0,0) scale(1)}
}
@keyframes drift-b{
  0%{transform:translate(0,0) scale(1)}
  33%{transform:translate(-38px,28px) scale(1.04)}
  66%{transform:translate(30px,40px) scale(.96)}
  100%{transform:translate(0,0) scale(1)}
}
@keyframes drift-c{
  0%{transform:translate(0,0) scale(1)}
  20%{transform:translate(26px,30px) scale(1.03)}
  55%{transform:translate(44px,-22px) scale(.98)}
  80%{transform:translate(-20px,-34px) scale(1.05)}
  100%{transform:translate(0,0) scale(1)}
}
@media (prefers-reduced-motion:reduce){.bubble{animation:none!important}}

/* ヒーロー内のドット装飾 */
.dots{position:absolute;width:120px;height:80px;z-index:1;opacity:.5;
  background-image:radial-gradient(var(--yellow) 3px,transparent 3px);background-size:18px 18px}
.dots-1{top:90px;left:46%}

/* features */
.features{padding:36px 0}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat{background:var(--card);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow-sm)}
.feat-ico{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:13px;font-size:1.4rem;margin-bottom:12px}
.feat h3{font-size:1.15rem;margin-bottom:6px}
.feat p{color:#6d665b;font-size:.92rem}

/* 紹介動画 */
.video-sec{padding:24px 0 10px}
.video-frame{max-width:760px;margin:14px auto 0;border-radius:24px;overflow:hidden;
  box-shadow:var(--shadow);background:#000;position:relative;z-index:1}
.video-frame video{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}

/* how to */
.howto{padding:30px 0}
.panel{background:#FBF3DF;border-radius:30px;padding:34px 30px}
.howto-grid{display:grid;grid-template-columns:230px 1fr;gap:30px;align-items:center}
.sec-title{display:inline-block;font-size:1.6rem;font-weight:900;background:#D7E9F7;border-radius:12px;padding:.15em .7em;margin-bottom:18px}
.sec-title.center{display:block;text-align:center;background:none;color:var(--ink)}
.steps{list-style:none;display:flex;flex-direction:column;gap:18px}
.steps li{display:flex;gap:14px;align-items:center}
.step-no{flex:none;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900}
.steps p{font-weight:700;font-size:.98rem}
.howto-screens{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.mini{background:#fff;border-radius:20px;padding:14px;box-shadow:var(--shadow-sm);position:relative;width:170px}
.mini-board{display:grid;grid-template-columns:repeat(4,1fr);gap:5px}
.mini-board .t{font-size:1rem;border-radius:8px}
.mini .tap{position:absolute;right:18px;bottom:6px;font-size:1.8rem}
.arrow{color:#A9C7E6;font-weight:900;letter-spacing:-2px}
.mini-cap{text-align:center;font-weight:700;font-size:.82rem;color:#6d665b;margin-bottom:8px}
.badge-correct{background:var(--green);color:#3c6b2c;font-weight:900;text-align:center;border-radius:10px;padding:5px;margin-bottom:10px;border:2px solid #fff;box-shadow:0 0 0 2px var(--green)}
.clear-title{font-weight:900;font-size:.95rem;text-align:center;margin-bottom:8px}
/* 答えカード */
.mini-answer{width:190px}
.ans-row{display:flex;align-items:center;gap:5px;margin-bottom:6px}
.ans-row .t{font-size:.92rem;border-radius:7px}
.ans-k{flex:none;width:30px;height:30px;display:flex;align-items:center;justify-content:center;
  background:#fff;border:2px solid var(--ink);border-radius:8px;font-weight:900;font-size:.95rem;margin-left:4px}
.ans-note{font-size:.72rem;color:var(--muted);font-weight:700;text-align:center;margin-top:6px;line-height:1.5}
.ans-note u{text-decoration-color:var(--yellow-d)}

/* mid band: design + voices + cta */
.midband{padding:40px 0}
.mid-grid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto;gap:22px}
.design-card{grid-row:span 2;background:#E9F3DD;border-radius:30px;padding:30px;position:relative;overflow:hidden;display:flex;flex-direction:column}
.design-card h2{font-size:1.7rem;font-weight:900;line-height:1.4}
.design-mascot{margin-top:auto;align-self:center;filter:drop-shadow(0 10px 16px rgba(80,100,50,.18))}
.voices{background:var(--card);border-radius:30px;padding:24px 26px;box-shadow:var(--shadow-sm)}
.voice{display:flex;gap:12px;align-items:flex-start;background:#FBF7EE;border-radius:16px;padding:12px 14px;margin-bottom:12px}
.voice:last-child{margin-bottom:0}
.ava{flex:none;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem}
.voice p{font-size:.9rem;font-weight:700}
.voice p b{color:var(--ink)}
.voice small{display:block;color:var(--muted);font-weight:500;margin-top:3px}
.cta-card{background:linear-gradient(180deg,#FEE7A6,#FBD56B);border-radius:30px;padding:28px;text-align:center}
.cta-card h2{font-size:1.7rem;font-weight:900;color:#7a5a14}
.cta-icon{border-radius:26px;margin:14px 0 6px;box-shadow:var(--shadow)}
.cta-name{font-size:1.5rem;font-weight:900;margin-bottom:4px}
.cta-tag{color:#7a5a14;font-weight:700;font-size:.95rem;margin-bottom:14px}
.cta-tag b{color:inherit;background:linear-gradient(transparent 58%,rgba(255,255,255,.6) 58%);padding:0 .1em}
.footer-tag b{color:var(--ink);background:linear-gradient(transparent 58%,#FDE49A 58%);padding:0 .1em}

/* 毎日の問題 */
.daily-sec{padding:34px 0}
.sec-lead{color:#6d665b;font-weight:700;margin:-6px auto 22px;max-width:640px}
.sec-lead.center{text-align:center}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.daily-card{background:var(--card);border-radius:var(--radius);padding:24px 22px;box-shadow:var(--shadow-sm);text-align:center}
.daily-ico{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:15px;font-size:1.5rem;margin-bottom:12px}
.daily-card h3{font-size:1.15rem;margin-bottom:8px}
.daily-card p{color:#6d665b;font-size:.92rem}

/* FAQ */
.faq-sec{padding:30px 0 6px}
.faq-list{max-width:760px;margin:18px auto 0;display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--card);border-radius:16px;box-shadow:var(--shadow-sm);overflow:hidden}
.faq-item summary{list-style:none;cursor:pointer;padding:16px 48px 16px 20px;font-weight:700;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"＋";position:absolute;right:20px;top:50%;transform:translateY(-50%);color:var(--yellow-d);font-weight:900;font-size:1.2rem}
.faq-item[open] summary::after{content:"−"}
.faq-item summary:hover{color:var(--link)}
.faq-item p{padding:0 20px 18px;color:#6d665b;font-size:.94rem}

/* ===== 法務ページ(privacy / terms) ===== */
.legal{padding:40px 0 60px}
.legal-wrap{max-width:760px;margin:0 auto;background:var(--card);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:42px 46px}
.legal h1{font-size:2rem;font-weight:900;margin-bottom:6px}
.legal .updated{color:var(--muted);font-weight:700;font-size:.9rem;margin-bottom:26px}
.legal h2{font-size:1.25rem;font-weight:900;margin:32px 0 10px;padding-left:12px;border-left:5px solid var(--yellow)}
.legal h3{font-size:1.05rem;font-weight:900;margin:20px 0 8px}
.legal p{margin:0 0 12px;color:#48433c}
.legal ul,.legal ol{margin:0 0 14px;padding-left:1.4em;color:#48433c}
.legal li{margin-bottom:6px}
.legal a{color:var(--link);text-decoration:underline}
.legal .lead{font-size:1.02rem}
.legal table{width:100%;border-collapse:collapse;margin:6px 0 18px;font-size:.92rem}
.legal th,.legal td{border:1px solid var(--hairline);padding:9px 12px;text-align:left;vertical-align:top}
.legal th{background:#FBF3DF;font-weight:700;white-space:nowrap}
.legal .note{background:#FBF7EE;border:1px dashed #E2D6BC;border-radius:14px;padding:16px 18px;margin:0 0 24px;font-size:.92rem;color:#6d665b}
.legal .todo{background:#FFE08A;color:#6a4e08;border-radius:6px;padding:.05em .4em;font-weight:700;font-style:normal}
.legal-back{display:inline-flex;align-items:center;gap:6px;margin-top:30px;font-weight:700;color:var(--link)}
.legal-toc{background:#FBF7EE;border-radius:14px;padding:16px 20px;margin-bottom:26px}
.legal-toc ol{margin:8px 0 0;padding-left:1.3em}
.legal-toc a{color:#5d564d;text-decoration:none;font-weight:700}
.legal-toc a:hover{color:var(--link)}
@media (max-width:560px){.legal-wrap{padding:28px 22px}.legal h1{font-size:1.6rem}}

/* footer */
.footer-tag{color:#6d665b;font-weight:700;font-size:.9rem}
.site-footer{background:#fff;border-top:1px solid var(--hairline);padding:26px 0;margin-top:20px}
.footer-inner{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.footer-links{display:flex;gap:24px;color:#6d665b;font-weight:700;font-size:.9rem}
.footer-links a:hover{color:var(--ink)}
.copy{margin-left:auto;color:var(--muted)}

/* ===== responsive ===== */
@media (max-width:880px){
  .nav{display:none}
  .hero-inner{grid-template-columns:1fr;gap:50px}
  .hero-title{font-size:4rem}
  .hero-visual{margin-top:10px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .howto-grid{grid-template-columns:1fr}
  .howto-screens .arrow{transform:rotate(90deg)}
  .mid-grid{grid-template-columns:1fr}
  .design-card{grid-row:auto}
}
@media (max-width:480px){
  .hero-title{font-size:3.2rem}
  .grid-4{grid-template-columns:1fr}
  .header-inner .btn-pill{display:none}
  .container{padding:0 16px}
}