/* ============================================================
   Resonance / Continuity Project — Site Design System
   Palette C : 生成り × クレイ (warm paper × sumi × clay)
   Shared across public pages (Top / About / Workshop).
   ============================================================ */

:root{
  /* ── ground / ink ── */
  --bg:        #f5f1ea;   /* warm paper */
  --bg-tint:   #efe8dc;   /* alt sections */
  --paper:     #fbf8f2;   /* raised card surface */
  --ink:       #2b2620;   /* sumi (warm near-black) */
  --muted:     #7a7065;   /* secondary text */
  --line:      rgba(43,38,32,.13);
  --line-soft: rgba(43,38,32,.07);

  /* ── accents ── */
  --clay:      #b06044;   /* primary brand / interactive */
  --clay-deep: #954f37;   /* hover */
  --gold:      #b58a4a;   /* line & small marks only */

  --shadow:    0 6px 22px rgba(43,38,32,.08);
  --shadow-lg: 0 14px 40px rgba(43,38,32,.12);

  /* ── type ── */
  --serif: "Shippori Mincho", serif;
  --sans:  "Noto Sans JP", -apple-system, "Hiragino Sans", system-ui, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;

  --wrap: 1040px;   /* page max width */
  --read: 640px;    /* comfortable reading measure */
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-weight:300;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* subtle paper grain */
body::before{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:100;opacity:.5;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
}

a{color:var(--clay);text-decoration:none;transition:color .2s}
a:hover{color:var(--clay-deep)}
:focus-visible{outline:2px solid var(--clay);outline-offset:3px;border-radius:2px}
img{max-width:100%;display:block}

/* ── shared containers ── */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}

/* ── eyebrow / labels ── */
.eyebrow{
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold);
}

/* =========================================================
   SITE HEADER (shared nav)
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(245,241,234,.82);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}
.site-header .bar{
  max-width:var(--wrap);margin:0 auto;padding:16px 32px;
  display:flex;align-items:center;gap:24px;
}
.brand{
  font-family:var(--serif);font-size:16px;font-weight:500;color:var(--ink);
  letter-spacing:.02em;white-space:nowrap;
}
.brand:hover{color:var(--ink)}
.brand .mark{color:var(--clay)}
.site-nav{margin-left:auto;display:flex;gap:26px;align-items:center}
.site-nav a{
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
  text-transform:uppercase;position:relative;padding:2px 0;
}
.site-nav a::after{
  content:'';position:absolute;left:0;bottom:-3px;width:0;height:1px;
  background:var(--clay);transition:width .2s;
}
.site-nav a:hover{color:var(--ink)}
.site-nav a:hover::after,.site-nav a[aria-current="page"]::after{width:100%}
.site-nav a[aria-current="page"]{color:var(--ink)}

/* =========================================================
   HERO
   ========================================================= */
.hero{padding:88px 0 64px;border-bottom:1px solid var(--line)}
.hero .eyebrow{margin-bottom:26px}
.hero h1{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(32px,5.2vw,60px);line-height:1.28;letter-spacing:.01em;
  text-wrap:balance;margin-bottom:22px;
}
.hero h1 em{font-style:normal;color:var(--clay)}
.hero .lead{
  font-size:15px;color:var(--muted);max-width:34em;line-height:2.05;margin-bottom:34px;
}
.hero-media{
  width:100%;aspect-ratio:900/297;object-fit:cover;
  border-radius:14px;box-shadow:var(--shadow-lg);background:var(--bg-tint);margin-top:8px;
}

/* ── buttons ── */
.btn-row{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;padding:13px 30px;border-radius:2px;
  border:1px solid var(--clay);background:var(--clay);color:var(--paper);
  transition:background .2s,color .2s;
}
.btn:hover{background:var(--clay-deep);color:var(--paper)}
.btn.ghost{background:transparent;color:var(--clay)}
.btn.ghost:hover{background:var(--clay);color:var(--paper)}

/* =========================================================
   SECTIONS
   ========================================================= */
.section{padding:64px 0;border-bottom:1px solid var(--line)}
.section-head{
  display:flex;align-items:center;gap:16px;margin-bottom:28px;
}
.section-head .eyebrow{white-space:nowrap}
.section-head::after{content:'';flex:1;height:1px;background:var(--line)}
.section h2{
  font-family:var(--serif);font-weight:400;font-size:clamp(20px,3vw,28px);
  line-height:1.4;color:var(--ink);
}
.prose{max-width:var(--read);font-size:14px;color:var(--muted);line-height:2.05}
.prose strong{color:var(--ink);font-weight:500}
.prose em{font-style:normal;color:var(--clay)}

/* callout / "これは何？" */
.callout{
  border:1px solid var(--line);border-left:2px solid var(--clay);
  background:var(--paper);padding:22px 26px;border-radius:0 8px 8px 0;
  max-width:var(--read);font-size:13.5px;color:var(--muted);line-height:2;
}
.callout b{color:var(--ink);font-weight:500}

/* =========================================================
   AUDIO LIST (Listening Room)
   ========================================================= */
.audio-list{display:flex;flex-direction:column;gap:18px;max-width:var(--read)}
.audio-item{display:flex;flex-direction:column;gap:8px}
.audio-item .t{font-size:13.5px;color:var(--ink)}
.audio-item .t span{
  font-family:var(--mono);font-size:11px;color:var(--gold);
  letter-spacing:.06em;margin-right:8px;
}
.audio-item audio{width:100%;max-width:420px;height:36px}

/* =========================================================
   LOG LIST (Latest Logs)
   ========================================================= */
.log-list{list-style:none;max-width:var(--read)}
.log-list li{
  padding:14px 0;border-bottom:1px solid var(--line-soft);
  font-size:13.5px;color:var(--ink);display:flex;gap:14px;align-items:baseline;
}
.log-list li::before{
  content:'—';color:var(--gold);font-family:var(--mono);flex-shrink:0;
}

/* =========================================================
   CARD GRID (Archive)
   ========================================================= */
.card-grid{
  display:grid;gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:12px;overflow:hidden;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
}
.card{
  background:var(--bg);padding:26px 26px 24px;
  display:flex;flex-direction:column;gap:8px;transition:background .2s;
  text-decoration:none;
}
.card:hover{background:var(--paper)}
.card h3{
  font-family:var(--serif);font-weight:500;font-size:16px;color:var(--ink);
  letter-spacing:.01em;
}
.card p{font-size:13px;color:var(--muted);line-height:1.85;flex:1}
.card .go{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--clay);
}
.card:hover .go{color:var(--clay-deep)}
/* featured card (Workshop) */
.card.feature{background:var(--ink)}
.card.feature h3{color:var(--bg)}
.card.feature p{color:rgba(245,241,234,.6)}
.card.feature .go{color:var(--gold)}
.card.feature:hover{background:#3a332b}

/* =========================================================
   STATUS CHIP
   ========================================================= */
.chip{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:5px 14px;background:var(--paper);
}
.chip .dot{width:6px;height:6px;border-radius:50%;background:var(--clay)}

/* =========================================================
   FOOTER (shared)
   ========================================================= */
.site-footer{padding:44px 0 60px}
.site-footer .row{
  max-width:var(--wrap);margin:0 auto;padding:0 32px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
}
.site-footer .cr{font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.04em}
.site-footer .links{display:flex;gap:20px}
.site-footer .links a{font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.04em}
.site-footer .links a:hover{color:var(--clay)}

/* =========================================================
   MOTION
   ========================================================= */
.fade{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.fade.in{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .fade{opacity:1;transform:none;transition:none}
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width:640px){
  .wrap,.site-header .bar,.site-footer .row{padding-left:20px;padding-right:20px}
  .hero{padding:56px 0 44px}
  .section{padding:48px 0}
  .site-nav{gap:16px}
  .brand{font-size:14px}
}