/* TERASU Knowledge 共通スタイル */
:root{--bg:#08080a;--w:#fff;--w2:rgba(255,255,255,.5);--w3:rgba(255,255,255,.22);--w4:rgba(255,255,255,.07);--amb:rgba(255,200,120,.9);--ff:'Inter','Noto Sans JP',system-ui,sans-serif;--fd:'Cormorant Garamond',serif}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--ff);color:var(--w3);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden;font-size:15px;line-height:1.85}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}
::selection{background:rgba(255,200,120,.2)}

/* HEADER */
.hdr{position:fixed;top:0;left:0;width:100%;z-index:900;padding:.85rem clamp(1.5rem,5vw,3rem);display:flex;align-items:center;justify-content:space-between;background:rgba(8,8,10,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--w4)}
.hdr-logo{display:flex;align-items:center;gap:.6rem}
.hdr-logo svg{width:22px;height:22px}
.logo-spin{animation:logoSpin 12s linear infinite}
@keyframes logoSpin{0%,15%{transform:rotate(0)}40%{transform:rotate(180deg)}55%{transform:rotate(180deg)}80%{transform:rotate(360deg)}100%{transform:rotate(360deg)}}
.logo-pulse{animation:logoPulse 3s ease-in-out infinite}
@keyframes logoPulse{0%,100%{opacity:.8}50%{opacity:1}}
.hdr-logo span{font-family:var(--fd);font-size:.65rem;letter-spacing:.18em;color:rgba(255,255,255,.85)}
.hdr-logo .sub{color:var(--amb);margin-left:.3rem}
.nv{display:flex;gap:1.5rem}
.nv a{font-size:.72rem;letter-spacing:.05em;color:rgba(255,255,255,.85);font-weight:600;transition:color .2s}
.nv a:hover,.nv a.active{color:var(--amb)}
@media(max-width:640px){.nv{gap:.8rem}.nv a{font-size:.65rem}}

/* PAGE HEADER */
.pg-hdr{padding:calc(55px + clamp(3rem,6vw,5rem)) 0 clamp(2rem,4vw,3rem);text-align:center;position:relative;overflow:hidden}
.pg-hdr::before{content:'';position:absolute;top:55%;left:50%;transform:translate(-50%,-50%);width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(255,200,120,.05),transparent 70%);pointer-events:none}
.pg-hdr-inner{position:relative;z-index:1;max-width:780px;margin:0 auto;padding:0 clamp(1.5rem,5vw,3rem)}
.pg-tag{font-family:var(--fd);font-size:.6rem;letter-spacing:.3em;color:var(--amb);text-transform:uppercase;margin-bottom:1rem;font-style:italic}
.pg-hdr h1{font-family:var(--fd);font-size:clamp(2rem,4.5vw,3.2rem);font-weight:300;color:var(--w);line-height:1.3;letter-spacing:.04em;margin-bottom:1rem}
.pg-hdr h1 em{font-style:italic;color:var(--amb)}
.pg-sub{font-size:.82rem;color:rgba(255,255,255,.55);line-height:2.1;max-width:560px;margin:0 auto}

/* LAYOUT */
.mx{max-width:1200px;margin:0 auto;padding:0 clamp(1.5rem,5vw,3rem)}
.mxn{max-width:780px;margin:0 auto;padding:0 clamp(1.5rem,5vw,3rem)}
.sc{padding:clamp(3rem,6vw,5rem) 0}
.label{font-family:var(--fd);font-size:.55rem;letter-spacing:.3em;color:var(--amb);text-transform:uppercase;font-style:italic;margin-bottom:.6rem;display:flex;align-items:center;gap:.6rem}
.label::before{content:'';width:20px;height:1px;background:var(--amb);opacity:.6}
.h2{font-family:var(--fd);font-size:clamp(1.6rem,3.5vw,2.4rem);font-weight:300;color:var(--w);letter-spacing:.03em}
.h2 em{font-style:italic;color:var(--amb)}

/* FILTER */
.filter{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:2rem;padding:1rem;border:1px solid var(--w4);background:rgba(255,255,255,.015)}
.filter-label{font-family:var(--fd);font-size:.55rem;letter-spacing:.25em;color:var(--w2);text-transform:uppercase;font-style:italic;width:100%;margin-bottom:.4rem}
.filter button{padding:.4rem 1rem;background:transparent;border:1px solid var(--w4);color:var(--w2);font-family:var(--ff);font-size:.7rem;cursor:pointer;transition:all .2s;font-weight:500}
.filter button:hover{border-color:var(--amb);color:var(--amb)}
.filter button.on{background:rgba(255,200,120,.12);border-color:var(--amb);color:var(--amb)}

/* CARDS */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
@media(max-width:900px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.card-grid{grid-template-columns:1fr}}
.tk-card{display:block;background:transparent;border:1px solid var(--w4);transition:all .4s;overflow:hidden;cursor:pointer}
.tk-card:hover{border-color:rgba(255,200,120,.3);transform:translateY(-3px);box-shadow:0 12px 32px rgba(0,0,0,.4)}
.tk-card-img{aspect-ratio:16/10;background:linear-gradient(135deg,#1a1a1f,#0c0c0f);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--w3);font-family:var(--fd);font-size:.85rem;letter-spacing:.1em;font-style:italic}
.tk-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.tk-card:hover .tk-card-img img{transform:scale(1.04)}
.tk-card-body{padding:1.2rem 1.4rem}
.tk-card-tag{font-family:var(--fd);font-size:.5rem;letter-spacing:.25em;color:var(--amb);text-transform:uppercase;margin-bottom:.4rem;font-style:italic}
.tk-card-title{font-size:.95rem;font-weight:600;color:var(--w);line-height:1.45;margin-bottom:.5rem}
.tk-card-desc{font-size:.7rem;color:rgba(255,255,255,.55);line-height:1.8;margin-bottom:.5rem}
.tk-card-meta{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.6rem}
.tk-card-meta span{font-size:.55rem;padding:.15rem .5rem;border:1px solid var(--w4);color:var(--w2);font-weight:500;letter-spacing:.05em}

/* FOOTER */
.ftr{padding:2rem 0 1.5rem;border-top:1px solid var(--w4);margin-top:4rem}
.ftr-mx{max-width:1100px;margin:0 auto;padding:0 clamp(1.5rem,5vw,3rem);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}
.ftr-text{font-family:var(--fd);font-size:.55rem;letter-spacing:.15em;color:rgba(255,255,255,.3);font-style:italic}
.ftr-link{font-size:.65rem;color:rgba(255,255,255,.4);transition:color .2s}
.ftr-link:hover{color:var(--w2)}

/* REVEAL */
.rv{opacity:0;transform:translateY(15px);transition:opacity .8s,transform 1s}
.rv.on{opacity:1;transform:none}
.d1{transition-delay:.1s}.d2{transition-delay:.2s}.d3{transition-delay:.3s}.d4{transition-delay:.4s}