/* ════════════════════════════════════════════════════════
   さわかみアーカイブス — 共通スタイル
   :root / body / cursor / nav / hamburger / mobileMenu / footer
════════════════════════════════════════════════════════ */


*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --sepia-dark: #2a2218;
  --sepia-mid: #3d3128;
  --amber: #d4a847;
  --amber-light: #f5c563;
  --cream: #faf6ed;
  --cream-dark: #f0e8d8;
  --silver: #d4caba;
  --text-muted: #a89680;
}

html { scroll-behavior: smooth; }
body {
  background: var(--sepia-dark);
  color: var(--cream);
  font-family: 'Noto Serif JP', serif;
  font-weight: 200;
  overflow-x: hidden;
  cursor: none;
}

/* ─── CURSOR ─── */
.cursor { position:fixed;width:8px;height:8px;background:var(--amber);border-radius:50%;pointer-events:none;z-index:9999;transform:translate(-50%,-50%);transition:width .3s,height .3s;mix-blend-mode:screen; }
.cursor-ring { position:fixed;width:36px;height:36px;border:1px solid rgba(200,146,42,.4);border-radius:50%;pointer-events:none;z-index:9998;transform:translate(-50%,-50%);transition:all .12s ease; }

/* ─── OVERLAYS ─── */
.grain {
  position:fixed;
  inset:-50%;
  width:200%;
  height:200%;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity:.025;
  pointer-events:none;
  z-index:200;
  animation:grain .4s steps(1) infinite;
}

@keyframes grain{0%,100%{transform:translate(0,0)}10%{transform:translate(-2%,-1%)}20%{transform:translate(3%,2%)}30%{transform:translate(-1%,3%)}40%{transform:translate(2%,-2%)}50%{transform:translate(-3%,1%)}60%{transform:translate(1%,-3%)}70%{transform:translate(-2%,2%)}80%{transform:translate(3%,-1%)}90%{transform:translate(-1%,-2%)}}
.scanlines { position:fixed;inset:0;pointer-events:none;z-index:199;background:repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(0,0,0,.015) 2px,rgba(0,0,0,.015) 4px); }

/* ─── NAV ─── */
nav { position:fixed;top:0;left:0;right:0;z-index:500;display:flex;justify-content:space-between;align-items:center;padding:1rem 4rem;background:linear-gradient(to bottom,rgba(42,34,24,.88) 0%,transparent 100%);transition:background .4s,border-color .4s; }
nav.scrolled { background:rgba(42,34,24,.94);border-bottom:1px solid rgba(212,168,71,.15); }
.nav-logo { font-family:'Space Mono',monospace;font-size:.7rem;letter-spacing:.4em;color:var(--amber);text-transform:uppercase;position:relative;z-index:502; aspect-ratio: 10 / 3; max-width:180px;width:auto; }

.nav-links { display:flex;gap:3rem;list-style:none; }
.nav-links a { font-family:'Space Mono',monospace;font-size:.6rem;letter-spacing:.2em;color:var(--text-muted);text-decoration:none;text-transform:uppercase;transition:color .3s; }
.nav-links a:hover { color:var(--cream); }
.nav-cta { font-family:'Space Mono',monospace;font-size:.6rem;letter-spacing:.2em;color:var(--sepia-dark);background:var(--amber);border:none;padding:.65rem 1.5rem;cursor:pointer;text-transform:uppercase;transition:background .3s; }
.nav-cta:hover { background:var(--amber-light); }

/* ─── HAMBURGER ─── */
.nav-hamburger {
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:6px;
  width:40px;
  height:40px;
  background:none;
  border:none;
  cursor:pointer;
  padding:6px;
  position:relative;
  z-index:502;
}
.nav-hamburger span {
  display:block;
  width:100%;
  height:1px;
  background:var(--amber);
  transition:transform .35s ease, opacity .25s ease;
  transform-origin:center center;
}
.nav-hamburger.open span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity:0; }
.nav-hamburger.open span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

/* ─── MOBILE OVERLAY MENU ─── */
#mobileMenu {
  display:none;
  position:fixed;
  inset:0;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:2.8rem;
  background:rgba(42,34,24,.97);
  backdrop-filter:blur(12px);
  z-index:501;
  list-style:none;
  opacity:0;
  pointer-events:none;
  transition:opacity .35s ease;
}
#mobileMenu.open {
  opacity:1;
  pointer-events:all;
}
#mobileMenu a {
  font-family:'Space Mono',monospace;
  font-size:.75rem;
  letter-spacing:.35em;
  color:var(--silver);
  text-decoration:none;
  text-transform:uppercase;
  transition:color .3s;
}
#mobileMenu a:hover { color:var(--amber); }
#mobileMenu li:last-child a {
  display:inline-block;
  padding:.75rem 2.2rem;
  background:var(--amber);
  color:var(--sepia-dark);
}
#mobileMenu li:last-child a:hover { background:var(--amber-light); }
.mob-close {
  position:absolute;
  top:1rem;
  right:1rem;
  width:40px;
  height:40px;
  background:none;
  border:1px solid rgba(212,168,71,.3);
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:0;
}
.mob-close span {
  position:absolute;
  width:18px;
  height:1px;
  background:var(--amber);
}
.mob-close span:nth-child(1) { transform:rotate(45deg); }
.mob-close span:nth-child(2) { transform:rotate(-45deg); }
.mob-close:hover { border-color:var(--amber); }

.btn-primary { font-family:'Space Mono',monospace;font-size:.65rem;letter-spacing:.25em;text-transform:uppercase;color:var(--sepia-dark);background:var(--amber);border:none;padding:1.1rem 2.8rem;cursor:none;position:relative;overflow:hidden;transition:background .3s; }
.btn-primary::after { content:'';position:absolute;inset:0;background:rgba(255,255,255,.12);transform:translateX(-100%);transition:transform .3s; }
.btn-primary:hover::after{transform:translateX(0);}.btn-primary:hover{background:var(--amber-light);}
.btn-secondary { font-family:'Space Mono',monospace;font-size:.65rem;letter-spacing:.25em;text-transform:uppercase;color:rgba(240,228,208,.72);display:flex;align-items:center;gap:.8rem;text-decoration:none;transition:color .3s; }
.btn-secondary:hover{color:var(--cream);}
.btn-secondary .arrow{width:32px;height:1px;background:currentColor;position:relative;transition:width .3s;}
.btn-secondary:hover .arrow{width:52px;}
.btn-secondary .arrow::after{content:'';position:absolute;right:0;top:50%;transform:translateY(-50%) rotate(45deg);width:6px;height:6px;border-right:1px solid currentColor;border-top:1px solid currentColor;}

.scroll-indicator{
  position:absolute;
  bottom:3rem;
  left:50%;
  transform:translateX(-50%);
  z-index:5;
  opacity:0;
  animation:fadeIn 1s ease 2.2s forwards;
  display: flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
}
.scroll-indicator span {
    font-family: 'Cormorant Garamond', serif;
    font-size: 10px;
    letter-spacing: 0.5em;
    color: rgba(136, 212, 232, 0.42);
    text-transform: uppercase;
}
.scroll-line{
  width:1px;
  /*height:60px;*/
  background:linear-gradient(to bottom,rgba(200,146,42,.8),transparent);
  animation:scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%   { height:0;    opacity:0.8; }
    70%  { height:60px; opacity:0.6; }
    100% { height:60px; opacity:0; }
}

/* ─── FOOTER ─── */
footer{padding:4rem 5rem;border-top:1px solid rgba(200,146,42,.15);display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:4rem;background:var(--sepia-dark);}
.footer-brand .logo{font-family:'Space Mono',monospace;font-size:.7rem;letter-spacing:.4em;color:var(--amber);text-transform:uppercase;margin-bottom:1.5rem;display:block;}
.footer-brand p{font-size:.8rem;line-height:2;color:var(--text-muted);max-width:280px;}
.footer-col h4{font-family:'Space Mono',monospace;font-size:.52rem;letter-spacing:.3em;text-transform:uppercase;color:var(--cream);margin-bottom:1.5rem;}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:.8rem;}
.footer-col ul a{font-size:.8rem;color:var(--text-muted);text-decoration:none;transition:color .3s;}
.footer-col ul a:hover{color:var(--cream);}
.footer-bottom{padding:1.8rem 5rem;border-top:1px solid rgba(200,146,42,.07);display:flex;justify-content:space-between;align-items:center;background:var(--sepia-dark);}
.footer-bottom p{font-family:'Space Mono',monospace;font-size:.52rem;letter-spacing:.2em;color:var(--text-muted);}

.footer-nav-logo { position:relative;z-index:1; aspect-ratio:10/3; max-width:180px;width:auto; }

.nav-social {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.nav-social a {
    width: 45px;
    height: 45px;
    background: rgba(212, 175, 55, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #d4af37;
    text-decoration: none;
    font-size: 1.3rem;
    transition: all 0.3s ease;
}

.nav-social a:hover {
    background: #d4af37;
    color: #fff;
    transform: translateY(-3px);
}

/* ─── SHARED SECTION LABELS ─── */
.section-label{
  font-family:'Space Mono',monospace;
  font-size:.8rem;
  letter-spacing:.5em;
  color:var(--amber);
  text-transform:uppercase;
  margin-bottom:1.5rem;
  display:flex;
  align-items:center;
  gap:1.5rem;
}
.section-label::before{
  content:'';
  width:40px;
  height:1px;
  background:var(--amber);
}
.section-title{
  font-family:'Cormorant Garamond',serif;
  font-size:clamp(1.3rem,4.5vw,4.2rem);
  font-weight:300;
  line-height:1.2;
}
.section-title em{font-style:italic;color:var(--amber-light);}

/* ─── ANIMATIONS ─── */
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

.reveal{
  opacity:0;
  transform:translateY(32px);
  transition:opacity .9s ease,transform .9s ease;
}
.reveal.visible{
  opacity:1;
  transform:translateY(0);
}