/* =========================================================
   Avenir Main Styles — ultimate clean theme
   v2025-10-12e
   ========================================================= */

/* ===== Color System (Light base) ===== */
:root{
  --bg: #f7f9fc;            /* page background (light) */
  --bg-2: #ffffff;          /* surfaces */
  --ink: #0f172a;           /* primary text */
  --muted: #51607e;         /* secondary text */
  --brand-1: #4f7fff;       /* blue */
  --brand-2: #00d0a6;       /* teal */
  --brand-3: #7a5cff;       /* purple accent */
  --card: #ffffff;          /* card bg */
  --border: #e3e8f4;        /* hairline */
  --shadow: 0 12px 40px rgba(15,23,42,.08);
  --ring: 0 0 0 3px rgba(79,127,255,.25);

  --success:#12b886;
  --warn:#ffb100;
  --danger:#ef4444;

  --radius: 16px;
}

/* Dark auto */
@media (prefers-color-scheme: dark){
  :root{
    --bg: #0e1430;
    --bg-2:#0f1a3b;
    --ink: #eef5ff;
    --muted:#b7c6e6;
    --brand-1:#7aa2ff;
    --brand-2:#22e6c0;
    --brand-3:#a08bff;
    --card:#121d45;
    --border:#2c3d7a;
    --shadow:0 14px 40px rgba(0,0,0,.35);
    --ring: 0 0 0 3px rgba(122,162,255,.28);
  }
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family: ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans JP",sans-serif;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
a:hover{opacity:.9}
button,input,select,textarea{font:inherit;color:inherit}

/* ===== Layout ===== */
.container{max-width:1200px;margin:0 auto;padding:24px}
.wrap{max-width:1200px;margin:0 auto;padding:12px 16px}
.grid{display:grid;gap:16px}
@media(min-width:960px){ .grid-2{grid-template-columns:1fr 1fr} .grid-3{grid-template-columns:repeat(3,1fr)} }

.card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:16px; box-shadow:var(--shadow)
}
.card h3{margin:0 0 6px}
.muted{color:var(--muted)}

/* ===== Header / Nav ===== */
header.site{
  position:sticky;top:0;z-index:40;
  backdrop-filter:saturate(140%) blur(12px);
  background:color-mix(in srgb, var(--bg-2) 82%, transparent);
  border-bottom:1px solid var(--border)
}
.brand{font-weight:800;letter-spacing:.02em}
nav a{margin:0 10px;padding:6px 4px;border-radius:10px}
nav a[aria-current="page"]{background:color-mix(in srgb, var(--brand-1) 14%, transparent)}

/* ===== Hero（星粒 + グラデ） ===== */
.hero{
  position:relative; overflow:hidden;
  padding:72px 16px 28px;
  background:
    radial-gradient(1000px 360px at 50% -140px, color-mix(in srgb, var(--brand-1) 30%, transparent), transparent),
    linear-gradient(180deg, color-mix(in srgb, var(--brand-3) 18%, var(--bg)) 0%, var(--bg) 56%);
  border-bottom:1px solid var(--border)
}
.hero .inner{max-width:1200px;margin:0 auto;display:grid;gap:10px}
.hero h1{margin:0;font-size:clamp(26px,4.2vw,48px)}
.hero p{margin:4px 0 0;color:var(--muted)}
#heroCanvas{position:absolute;inset:0;pointer-events:none;opacity:.25}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:8px;justify-content:center;
  padding:10px 16px;border-radius:14px;border:1px solid var(--border);font-weight:700;cursor:pointer;
  transition:transform .08s ease, box-shadow .12s ease, opacity .2s ease; text-wrap:nowrap;
}
.btn:focus-visible{outline:none;box-shadow:var(--ring)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:linear-gradient(90deg,var(--brand-1),var(--brand-2)); color:#001018; border-color:transparent}
.btn.ghost{background:var(--bg-2)}
.btn.soft{background:color-mix(in srgb, var(--brand-1) 12%, var(--bg-2)); border-color:transparent}
.btn.badge{padding:6px 10px;border-radius:999px;font-weight:600}

/* Buttons row (購入4種を横並び) */
.row-purchase{display:flex;gap:10px;flex-wrap:nowrap;overflow:auto;padding:12px 0 4px}
.row-purchase .btn{min-width:120px}

/* ===== Media Frames (動画枠) ===== */
.video-grid{display:grid;gap:16px}
@media(min-width:920px){ .video-grid{grid-template-columns:1fr 1fr} }
.vcard{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow)}
.vcard h3{margin:4px 0 10px}
.vframe{position:relative;aspect-ratio:16/9;background:color-mix(in srgb, var(--ink) 8%, var(--bg));border-radius:12px;overflow:hidden}
.vframe iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* ===== Sections ===== */
.section-title{font-size:clamp(18px,2.6vw,28px);margin:0 0 10px}
.list{display:grid;gap:10px}
.list .row{display:flex;gap:8px;align-items:center}

/* ===== Footer ===== */
footer{padding:28px 16px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap}

/* ===== Forms ===== */
.input, input[type="text"], input[type="email"], input[type="number"], input[type="search"], select, textarea{
  background:var(--bg-2); border:1px solid var(--border); border-radius:12px; padding:10px 12px; min-width:220px
}
label{display:inline-flex;gap:8px;align-items:center}

/* ===== 31-band EQ —— 唯一の定義 ===== */
.eq-grid{
  display:grid; grid-template-columns:repeat(31,1fr); gap:6px; align-items:end;
  padding:10px; margin-top:12px; background:var(--bg-2);
  border:1px solid var(--border); border-radius:16px;
}
.eq-grid input[type="range"]{
  writing-mode:bt-lr; -webkit-appearance:slider-vertical; height:140px
}
.eq-grid .hz{ text-align:center; font-size:11px; color:var(--muted); margin-top:2px }

/* ===== Utilities ===== */
.center{text-align:center}
.muted{color:var(--muted)}
.hidden{display:none!important}
.badge{font-size:12px;padding:4px 8px;border:1px solid var(--border);border-radius:999px}
.kbd{font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;background:var(--bg-2);border:1px solid var(--border);border-radius:6px;padding:2px 6px}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}

/* cache-buster: 2025-10-12e */
/* === Purchase group & Newsletter === */
.purchase-box{
  background:var(--bg-2);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:12px;
  margin-top:10px;
  box-shadow:var(--shadow);
}
.purchase-box .title{
  font-weight:700; font-size:14px; color:var(--muted); margin:0 0 8px;
}
.newsletter{
  background:var(--bg-2);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:var(--shadow);
}
.newsletter .row{ display:flex; gap:8px; flex-wrap:wrap; align-items:center }
.newsletter input[type="email"]{ min-width:260px }
.newsletter .hint{ font-size:12px; color:var(--muted) }