/* 金の扉 — N♡RIKO / optin / deck × royal-purple × card-flip */
:root{
  --bg:#12061f;--bg2:#1b0b2c;--card:#24123a;--ink:#f7efff;--body:#cdb9e0;--muted:#8a72a3;
  --line:rgba(247,239,255,.14);--accent:#e5c158;--accent-2:#c084fc;--line-color:#06C755;
  --serif:'Cinzel',serif;--jp-h:'Shippori Mincho B1',serif;--jp-b:'Noto Sans JP',sans-serif;
}
*{box-sizing:border-box}
html{overflow-x:clip;background:var(--bg);scroll-snap-type:y mandatory}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--jp-b);line-height:1.8;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit}
.wrap{max-width:640px;margin:0 auto;padding:0 28px;width:100%}
h1,h2,h3{font-family:var(--jp-h);font-weight:600;line-height:1.4;margin:0 0 .5em}
.eyebrow{font-family:var(--serif);letter-spacing:.28em;text-transform:uppercase;font-size:.76rem;color:var(--accent);margin:0 0 1em}
p{margin:0 0 1.1em}

/* 上部: ページ番号 + ゲージ */
.deck-top{position:fixed;top:0;left:0;right:0;z-index:80;padding:16px 24px;display:flex;align-items:center;justify-content:space-between;
  background:linear-gradient(180deg,rgba(18,6,31,.75),transparent);pointer-events:none}
.deck-top__page{font-family:var(--serif);font-size:.8rem;letter-spacing:.1em;color:var(--body)}
.progress{position:fixed;top:0;left:0;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent-2));width:0%;z-index:81;transition:width .1s linear}

/* 右: ドットナビ */
.deck-nav{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:80;display:flex;flex-direction:column;gap:14px}
.deck-nav button{width:9px;height:9px;border-radius:50%;border:1px solid var(--muted);background:transparent;padding:0;cursor:pointer;position:relative}
.deck-nav button.is-on{background:var(--accent);border-color:var(--accent)}
.deck-nav button .lbl{position:absolute;right:18px;top:50%;transform:translateY(-50%);white-space:nowrap;font-size:.72rem;color:var(--body);opacity:0;transition:opacity .2s;font-family:var(--serif);letter-spacing:.06em}
.deck-nav button:hover .lbl{opacity:1}
@media (max-width:760px){.deck-nav{display:none}}

/* スライド共通 */
.slide{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;
  padding:110px 0 80px;position:relative;isolation:isolate;scroll-snap-align:start;scroll-snap-stop:always}
.slide__bg{position:absolute;inset:0;z-index:-2;background:radial-gradient(ellipse 65% 50% at 75% 20%,color-mix(in srgb,var(--accent-2) 30%,transparent) 0%,transparent 70%),
  linear-gradient(180deg,var(--bg2) 0%,var(--bg) 70%)}
.slide__bg::after{content:"";position:absolute;inset:0;
  background:radial-gradient(1.4px 1.4px at 15% 25%,#fff 0,transparent 60%),radial-gradient(1.2px 1.2px at 80% 60%,#fff 0,transparent 60%),
  radial-gradient(1px 1px at 45% 80%,#fff 0,transparent 60%),radial-gradient(1.4px 1.4px at 65% 15%,#fff 0,transparent 60%);opacity:.7}
.slide--alt .slide__bg{background:linear-gradient(180deg,var(--bg) 0%,var(--bg2) 100%)}
.slide__photo{position:absolute;inset:0;z-index:-3;margin:0}
.slide__photo img{width:100%;height:100%;object-fit:cover;object-position:center 40%}
.slide__scrim{position:absolute;inset:0;z-index:-2;
  background:radial-gradient(ellipse 80% 60% at 50% 45%,rgba(18,6,31,.42) 0%,rgba(18,6,31,.72) 65%,var(--bg) 100%)}
.slide__watermark{position:absolute;inset:0;z-index:-1;display:flex;align-items:center;justify-content:center;overflow:hidden;pointer-events:none}
.slide__watermark span{font-family:var(--serif);font-size:min(26vw,240px);font-weight:600;color:transparent;
  -webkit-text-stroke:1px color-mix(in srgb,var(--ink) 22%,transparent);letter-spacing:.02em;white-space:nowrap}

.in{opacity:0;transform:translateY(18px);transition:opacity .8s ease,transform .8s ease}
.in.is-in{opacity:1;transform:none}
.no-motion .in{opacity:1!important;transform:none!important}

/* 表紙 */
.hero__sender{font-family:var(--serif);font-style:italic;color:var(--body);font-size:.98rem;margin:0 0 1em}
.ribbon{display:inline-block;padding:.4em 1.1em;border:1px solid color-mix(in srgb,var(--accent) 55%,transparent);border-radius:999px;
  font-family:var(--serif);font-size:.78rem;letter-spacing:.12em;color:var(--accent);margin-bottom:1.2em}
.slide h1{font-size:clamp(2.1rem,7.5vw,3.4rem);color:var(--ink);max-width:14ch}
.slide__promise{font-family:var(--serif);font-style:italic;font-size:1.1rem;color:var(--body);margin-bottom:1.6em}

/* ボタン */
.btn{display:inline-flex;align-items:center;gap:.6em;padding:1em 1.8em;border-radius:999px;font-weight:700;text-decoration:none;font-size:1.02rem;border:1px solid transparent;transition:transform .25s ease}
.btn:hover{transform:translateY(-2px)}
.btn--line{background:linear-gradient(135deg,var(--accent),#c99a3a);color:#1c1208;box-shadow:0 10px 30px -10px color-mix(in srgb,var(--accent) 65%,transparent);animation:pulse 2.6s ease-in-out infinite}
.btn--line svg{color:#1c1208}
.btn--line:hover{animation-play-state:paused}
@keyframes pulse{0%,100%{box-shadow:0 10px 30px -10px color-mix(in srgb,var(--accent) 65%,transparent)}50%{box-shadow:0 10px 40px -4px color-mix(in srgb,var(--accent) 80%,transparent)}}
.cta__note{font-size:.8rem;color:var(--muted);margin-top:1em}
@media (prefers-reduced-motion: reduce){.btn--line{animation:none}.blob{animation:none}}

/* あるある(問題) */
.list{list-style:none;margin:0;padding:0;counter-reset:li;text-align:left;width:100%}
.list li{border-top:1px solid var(--line);padding:16px 0;color:var(--body);counter-increment:li;display:flex;gap:1em;align-items:baseline}
.list li:last-child{border-bottom:1px solid var(--line)}
.list li::before{content:counter(li,decimal-leading-zero);font-family:var(--serif);color:var(--accent);font-size:.85rem;letter-spacing:.1em;flex:0 0 auto}

/* 扉(card-flip) */
.doors{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;width:100%;max-width:520px;perspective:1200px}
.door{aspect-ratio:3/4;position:relative}
.door__in{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .8s cubic-bezier(.34,1.56,.64,1);cursor:pointer}
.door.is-on .door__in,.door:hover .door__in{transform:rotateY(180deg)}
.door__f,.door__b{position:absolute;inset:0;backface-visibility:hidden;border-radius:14px;border:1px solid var(--line);
  display:flex;flex-direction:column;align-items:center;justify-content:center;padding:10px;text-align:center}
.door__f{background:linear-gradient(160deg,var(--card),var(--bg2));color:var(--accent);font-family:var(--serif)}
.door__f .n{font-size:1.6rem}
.door__b{background:var(--card);transform:rotateY(180deg);color:var(--body);font-size:.82rem}
.doors__hint{font-size:.78rem;color:var(--muted);margin-top:1.2em}

/* 中身(3つの扉/章) */
.chapters{display:grid;gap:14px;width:100%;text-align:left}
.chapter{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px}
.chapter__no{font-family:var(--serif);color:var(--accent);font-size:.85rem;letter-spacing:.15em}
.chapter h3{margin:.3em 0 0;font-size:1.05rem;color:var(--ink)}

/* わたし(story) */
.story{text-align:left}
.story p{color:var(--body)}

/* 受け取れるもの */
.stat{padding:8px 0 20px}
.stat__num{font-family:var(--serif);font-size:clamp(2.6rem,10vw,4rem);color:var(--accent);line-height:1;display:inline-flex;align-items:baseline;gap:.15em}
.stat__num small{font-size:.35em;color:var(--body)}
.stat__cap{color:var(--muted);font-size:.82rem;margin-top:.5em}
.reassure{text-align:left;width:100%;color:var(--body);font-size:.92rem}
.reassure li{margin-bottom:.6em;padding-left:1.4em;position:relative}
.reassure li::before{content:"✓";position:absolute;left:0;color:var(--accent)}

/* フッター */
footer{padding:36px 0 48px;text-align:center;color:var(--muted);font-size:.8rem;scroll-snap-align:none;background:var(--bg)}
footer a{color:var(--body);text-decoration:underline}

@media (max-width:600px){
  .slide{padding:90px 0 64px}
}