/* cover-style images */
img{display:block;width:100%;height:100%;object-fit:cover}

/* ===== PROLOGUE (cover) ===== */
.cover{position:relative;min-height:88vh;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.cover__bg{position:absolute;inset:0;z-index:1;background:linear-gradient(135deg,#2b3038,#0E0F12)}
.cover__bg img{object-fit:contain;object-position:center 58%;transform:scale(1.06);animation:kb 22s ease-out forwards;filter:brightness(1.05)}
@keyframes kb{to{transform:scale(1.15)}}
.cover__scrim{position:absolute;inset:0;z-index:2;background:radial-gradient(ellipse at center,rgba(9,10,12,.38) 0%,rgba(9,10,12,.85) 100%)}
.cover__in{position:relative;z-index:3;padding:150px var(--pad) 80px;max-width:min(1100px,100%);width:100%}
.cover .crumb{font-size:11.5px;letter-spacing:.16em;color:rgba(255,255,255,.72);margin-bottom:30px}
.cover .crumb a:hover{color:var(--terra)}
.cover .roman{font-family:"Zen Old Mincho",serif;font-size:13px;letter-spacing:.4em;color:var(--terra);margin-bottom:22px}
.cover h1{font-family:"Zen Old Mincho",serif;font-weight:700;color:#fff;font-size:clamp(26px,4.2vw,52px);line-height:1.3;letter-spacing:.06em;white-space:nowrap;text-shadow:0 2px 40px rgba(0,0,0,.5)}
@media(max-width:420px){.cover h1{white-space:normal;font-size:clamp(24px,7vw,32px)}}
.cover .lead{margin-top:26px;color:#dfe4e9;font-size:15px;line-height:2.2;text-shadow:0 1px 16px rgba(0,0,0,.5)}
.cover__toc{margin-top:44px;display:flex;gap:0;justify-content:center;border-top:1px solid rgba(255,255,255,.25);border-bottom:1px solid rgba(255,255,255,.25)}
.cover__toc a{padding:16px 26px;font-family:"Zen Old Mincho",serif;font-size:13px;letter-spacing:.1em;color:#fff;display:flex;gap:10px;align-items:baseline;transition:color .3s}
.cover__toc a b{font-size:11px;color:var(--terra);font-weight:400}
.cover__toc a:hover{color:var(--terra)}
.cover__toc a + a{border-left:1px solid rgba(255,255,255,.25)}
@media(max-width:640px){.cover__toc{flex-direction:column}.cover__toc a + a{border-left:none;border-top:1px solid rgba(255,255,255,.25)}}

/* ===== WHAT (定義) ===== */
.what{background:var(--paper);padding:clamp(70px,10vw,120px) var(--pad);border-top:1px solid var(--line)}
.what__in{max-width:820px;margin:0 auto}
.what .roman{font-family:"Zen Old Mincho",serif;font-size:12.5px;letter-spacing:.34em;color:var(--terra);display:block;margin-bottom:26px}
.what__def{font-family:"Zen Old Mincho",serif;font-weight:700;color:#fff;font-size:clamp(24px,3.6vw,38px);line-height:1.85;letter-spacing:.05em}
.what__def em{font-style:normal;color:var(--terra)}
.what__body{margin-top:24px;font-size:15px;color:#b9c0c7;line-height:2.3;max-width:680px}
.what__body em{font-style:normal;color:#fff;border-bottom:1px solid var(--terra);padding-bottom:1px}
.what__patents{margin-top:38px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media(max-width:760px){.what__patents{grid-template-columns:1fr}}
.what__patents .pt{border:1px solid rgba(176,141,87,.4);background:rgba(176,141,87,.06);border-radius:2px;padding:18px 18px 16px}
.what__patents .pt b{display:block;font-family:"Zen Old Mincho",serif;font-size:16.5px;color:#DCCBA6;letter-spacing:.04em;line-height:1.5}
.what__patents .pt span{display:block;margin-top:6px;font-size:12px;color:var(--muted);letter-spacing:.04em;line-height:1.8}

/* ===== WHY PANELS (Q&Aで読み解く) ===== */
.why{position:relative;overflow:hidden;padding:clamp(84px,12vw,150px) var(--pad);border-top:1px solid var(--line);scroll-margin-top:70px}
.why--a{background:var(--midnight)}
.why--b{background:var(--paper)}
.why__num{position:absolute;right:clamp(8px,3vw,54px);top:clamp(8px,3vw,36px);z-index:1;font-family:"Zen Old Mincho",serif;font-weight:900;font-size:clamp(96px,17vw,220px);line-height:1;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.14);pointer-events:none}
.why__in{position:relative;z-index:2;max-width:820px;margin:0 auto}
.why__mark{display:inline-block;font-family:"Zen Old Mincho",serif;font-size:12px;letter-spacing:.28em;color:var(--terra);border:1px solid rgba(176,141,87,.55);border-radius:2px;padding:7px 16px;margin-bottom:36px}
.why__q{font-family:"Zen Old Mincho",serif;font-weight:700;color:#fff;font-size:clamp(23px,3.6vw,36px);line-height:1.65;letter-spacing:.05em;margin-bottom:28px}
.why__a{position:relative;font-family:"Zen Kaku Gothic New",sans-serif;font-weight:500;color:#E8DFC8;font-size:clamp(16px,2.2vw,21px);line-height:1.95;letter-spacing:.04em;max-width:740px;margin-top:4px;padding:18px 22px 18px clamp(18px,2.4vw,26px);background:rgba(176,141,87,.08);border-left:3px solid var(--terra);border-radius:0 2px 2px 0}
.why__a::before{content:"Answer";display:block;font-family:"Zen Old Mincho",serif;font-weight:400;font-size:11px;letter-spacing:.28em;color:var(--terra);margin-bottom:10px}
.why__a em{font-style:normal;font-weight:700;color:var(--terra)}
.why__detail{margin-top:24px;font-size:14.5px;color:#b9c0c7;line-height:2.25;max-width:680px}
.why__detail em{font-style:normal;color:#fff;border-bottom:1px solid var(--terra);padding-bottom:1px}
.why__facts{margin-top:30px;display:flex;flex-wrap:wrap;gap:10px;max-width:680px}
.why__facts span{border:1px solid rgba(176,141,87,.4);background:rgba(176,141,87,.07);border-radius:2px;padding:9px 16px;font-size:12px;letter-spacing:.05em;color:#c7cdd2;line-height:1.6}
.why__facts b{font-family:"Zen Old Mincho",serif;color:#DCCBA6;font-weight:700;font-size:14.5px;margin-right:7px}
.why__note{margin-top:12px;font-size:11px;color:#7b828a;letter-spacing:.03em}
.why__photo{position:relative;margin:clamp(44px,6vw,72px) calc(50% - 50vw) 0;width:100vw;max-width:none;overflow:hidden}
.why__photo img{width:100%;height:clamp(300px,44vw,560px);object-fit:cover;object-position:center 42%;display:block;filter:grayscale(.25) contrast(1.03) brightness(.9)}
.why__photo::after{content:"";position:absolute;inset:0;z-index:1;background:radial-gradient(ellipse at center,rgba(9,10,12,.55) 0%,rgba(9,10,12,.72) 100%)}
.why__photo figcaption{position:absolute;inset:0;z-index:2;display:flex;align-items:center;justify-content:center;padding:0 var(--pad);text-align:center}
.why__photo figcaption span{display:block;max-width:920px;font-family:"Zen Old Mincho",serif;font-weight:700;font-size:clamp(22px,3.8vw,40px);line-height:1.7;letter-spacing:.08em;color:#fff;text-shadow:0 2px 36px rgba(0,0,0,.65),0 0 1px rgba(0,0,0,.4)}
.why__next{margin-top:clamp(48px,6vw,76px);display:flex;flex-direction:column;align-items:center;gap:18px;text-align:center}
.why__next p{font-family:"Zen Old Mincho",serif;font-size:clamp(14.5px,1.9vw,17.5px);color:#e4e9ee;letter-spacing:.08em;line-height:2.1}
.why__next span{color:var(--terra);border-bottom:1px solid var(--terra);padding-bottom:2px}
.why__next-arrow{display:flex;flex-direction:column;align-items:center}
.why__next-arrow b{position:relative;display:block;width:1px;height:56px;background:rgba(255,255,255,.22);overflow:hidden}
.why__next-arrow b::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent,#DCCBA6);transform:translateY(-100%);animation:flowdown 2.4s var(--ease) infinite}
.why__next-arrow i{margin-top:2px;width:9px;height:9px;border-right:1px solid var(--terra);border-bottom:1px solid var(--terra);transform:rotate(45deg)}
@keyframes flowdown{0%{transform:translateY(-100%)}55%,100%{transform:translateY(100%)}}

/* conclusion: だから──早く、強く、美しい。 */
.conc{background:var(--midnight);padding:clamp(24px,5vw,64px) var(--pad) clamp(90px,12vw,150px);text-align:center}
.conc__lead{font-family:"Zen Old Mincho",serif;font-size:clamp(16px,2.2vw,22px);color:var(--terra);letter-spacing:.3em;margin-bottom:26px;opacity:0;transform:translateY(14px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.conc.in .conc__lead{opacity:1;transform:none}
.conc__words{font-family:"Zen Old Mincho",serif;font-weight:900;color:#fff;font-size:clamp(34px,6vw,72px);letter-spacing:.08em;line-height:1.6}
.conc__words span{display:inline-block;margin-right:.35em;opacity:0;transform:translateY(26px);filter:blur(6px);transition:opacity 1.2s var(--ease),transform 1.2s var(--ease),filter 1.2s var(--ease)}
.conc__words span:last-child{margin-right:0}
.conc.in .conc__words span{opacity:1;transform:none;filter:none}
.conc.in .conc__words span:nth-child(1){transition-delay:.4s}
.conc.in .conc__words span:nth-child(2){transition-delay:.75s}
.conc.in .conc__words span:nth-child(3){transition-delay:1.1s}
@media (prefers-reduced-motion: reduce) {.conc__lead,.conc__words span{opacity:1!important;transform:none!important;filter:none!important}}

/* verdict (conclusion): huge words */
.verdict{background:var(--paper);padding:clamp(64px,10vw,130px) var(--pad);border-top:1px solid var(--line)}
.verdict__in{max-width:980px;margin:0 auto}
.vrow{display:grid;grid-template-columns:auto 1fr;gap:clamp(24px,5vw,60px);align-items:baseline;padding:clamp(28px,4vw,44px) 0;border-bottom:1px solid var(--line)}
.vrow:first-of-type{border-top:1px solid var(--line)}
@media(max-width:640px){.vrow{grid-template-columns:1fr;gap:10px}}
.vrow .word{font-family:"Zen Old Mincho",serif;font-weight:900;color:#fff;font-size:clamp(44px,8vw,92px);line-height:1.1;letter-spacing:.04em;white-space:nowrap}
.vrow .word em{font-style:normal;color:var(--terra);font-size:.28em;letter-spacing:.14em;margin-left:14px;vertical-align:middle}
.vrow p{font-size:14.5px;color:#c7cdd2;line-height:2.15;max-width:440px}

/* epilogue: quiet FAQ */
.faq{background:var(--midnight);padding:clamp(60px,9vw,110px) var(--pad)}
.faq__in{max-width:820px;margin:0 auto}
.faq .roman{font-family:"Zen Old Mincho",serif;font-size:12.5px;letter-spacing:.34em;color:var(--terra);margin-bottom:18px;display:block;text-align:center}
.faq h2{font-family:"Zen Old Mincho",serif;font-weight:700;font-size:clamp(22px,3.2vw,32px);color:#fff;margin-bottom:clamp(28px,4vw,46px);text-align:center}
.qa{border-top:1px solid var(--line)}
.qa:last-child{border-bottom:1px solid var(--line)}
.qa summary{list-style:none;cursor:pointer;padding:24px 44px 24px 0;position:relative;font-family:"Zen Old Mincho",serif;font-size:16px;color:#fff;line-height:1.7}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";position:absolute;right:4px;top:22px;color:var(--terra);font-size:22px;transition:transform .35s var(--ease)}
.qa[open] summary::after{transform:rotate(45deg)}
.qa .ans{padding:0 0 28px;font-size:14.5px;color:#b9c0c7;line-height:2.1}

@media (prefers-reduced-motion: reduce) {

  .cover__bg img{transform:scale(1.06)}
}