/* ═══════════════════════════════════════════
   QR & GS1 Barcode Generator — main.css
   Japanese minimalist / Zen design
   Light, clean, breathable
   ═══════════════════════════════════════════ */

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

:root{
  --font:'DM Sans',system-ui,-apple-system,sans-serif;
  --bg:#faf9f7;
  --bg-warm:#f5f3ef;
  --surface:#ffffff;
  --border:#e8e5e0;
  --border-light:#f0ede8;
  --text:#2d2b28;
  --text-secondary:#7a756d;
  --text-tertiary:#a9a49b;
  --accent:#c4654a;
  --accent-soft:rgba(196,101,74,.08);
  --accent-hover:rgba(196,101,74,.14);
  --green-soft:#5a8a6e;
  --radius:12px;
  --radius-sm:8px;
  --shadow-sm:0 1px 3px rgba(0,0,0,.04);
  --shadow:0 2px 8px rgba(0,0,0,.06);
  --transition:all .2s ease;
}

html{font-family:var(--font);scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{background:var(--bg);color:var(--text);min-height:100vh;display:flex;flex-direction:column;line-height:1.7;font-size:15px;letter-spacing:.01em}
a{color:inherit;text-decoration:none}

/* ── Header ── */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,249,247,.92);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border-light);
  padding:.9rem 2rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
}
.site-header h1{
  font-size:1.05rem;font-weight:600;letter-spacing:.02em;color:var(--text);
}
.site-header h1 span{color:var(--text-secondary);font-weight:400}
.back-link{
  display:inline-flex;align-items:center;gap:.3rem;
  font-size:.85rem;font-weight:500;color:var(--text-secondary);
  padding:.4rem .8rem;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:var(--surface);
  transition:var(--transition);
}
.back-link:hover{color:var(--text);border-color:var(--text-tertiary)}

/* ── Ad Slots ── */
.ad-slot{
  margin:.8rem auto;width:100%;max-width:728px;height:90px;
  background:var(--bg-warm);border:1px dashed var(--border);
  border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-tertiary);font-size:.75rem;letter-spacing:.06em;
}
.ad-slot-inline{
  margin:1.5rem auto;width:300px;max-width:100%;height:250px;
  background:var(--bg-warm);border:1px dashed var(--border);
  border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-tertiary);font-size:.75rem;
}

/* ── Lobby ── */
.lobby-hero{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:4rem 1.5rem;text-align:center;
}
.lobby-hero h2{
  font-size:2rem;font-weight:600;letter-spacing:-.01em;
  margin-bottom:.4rem;color:var(--text);
}
.lobby-hero h2 span{color:var(--accent)}
.lobby-hero p.subtitle{
  color:var(--text-secondary);font-size:.95rem;
  margin-bottom:3rem;max-width:440px;line-height:1.8;
}

.card-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:1.2rem;width:100%;max-width:860px;
}
.sector-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.8rem 1.6rem;
  transition:var(--transition);cursor:pointer;
  position:relative;
}
.sector-card:hover{
  border-color:var(--accent);
  box-shadow:0 4px 16px rgba(196,101,74,.08);
  transform:translateY(-2px);
}
.sector-card .card-icon{font-size:1.6rem;margin-bottom:.6rem;display:block}
.sector-card h3{font-size:1.05rem;font-weight:600;margin-bottom:.3rem;color:var(--text)}
.sector-card p{font-size:.85rem;color:var(--text-secondary);line-height:1.6}
.sector-card .card-arrow{
  position:absolute;top:1.4rem;right:1.4rem;
  font-size:1rem;color:var(--text-tertiary);opacity:.3;
  transition:var(--transition);
}
.sector-card:hover .card-arrow{opacity:.8;color:var(--accent);transform:translateX(3px)}

/* ── Page Container ── */
.page-container{flex:1;width:100%;max-width:780px;margin:0 auto;padding:2rem 1.5rem}

/* ── Generator Card ── */
.gen-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:1.8rem;margin-bottom:1.2rem;
  box-shadow:var(--shadow-sm);
}
.gen-card h2{
  font-size:1.1rem;font-weight:600;margin-bottom:1.2rem;
  color:var(--text);display:flex;align-items:center;gap:.4rem;
  padding-bottom:.8rem;border-bottom:1px solid var(--border-light);
}

/* ── Form ── */
.form-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:.9rem;margin-bottom:1.2rem;
}
.form-group{display:flex;flex-direction:column;gap:.3rem}
.form-group label{
  font-size:.72rem;font-weight:600;color:var(--text-secondary);
  text-transform:uppercase;letter-spacing:.08em;
}
.form-group input[type="text"],
.form-group input[type="number"],
.form-group select,
.form-group textarea{
  padding:.55rem .7rem;border-radius:var(--radius-sm);
  border:1px solid var(--border);background:var(--bg);
  color:var(--text);font-family:var(--font);font-size:.9rem;
  transition:var(--transition);outline:none;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);
}
.form-group input[type="color"]{
  width:40px;height:32px;border:1px solid var(--border);
  border-radius:6px;cursor:pointer;background:transparent;padding:2px;
}
.form-group input[type="file"]{font-size:.8rem;color:var(--text-secondary)}
.form-group input[type="checkbox"]{
  width:16px;height:16px;accent-color:var(--accent);cursor:pointer;
}
.form-group small{font-size:.72rem;color:var(--text-tertiary)}

/* Color pair */
.color-pair{display:flex;gap:.6rem;align-items:center}
.color-pair .swatch{display:flex;flex-direction:column;align-items:center;gap:.15rem}
.color-pair .swatch span{font-size:.65rem;color:var(--text-tertiary)}

/* Checkbox inline label */
.check-label{
  display:flex;align-items:center;gap:.4rem;cursor:pointer;
  font-size:.85rem;color:var(--text);font-weight:500;
}

/* ── Buttons ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.35rem;
  padding:.6rem 1.2rem;border-radius:var(--radius-sm);
  font-family:var(--font);font-size:.88rem;font-weight:600;
  border:none;cursor:pointer;transition:var(--transition);letter-spacing:.01em;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#b55a42;transform:translateY(-1px)}
.btn-secondary{background:var(--bg-warm);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--border-light);border-color:var(--text-tertiary)}
.btn-group{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.8rem}

/* ── Preview ── */
.preview-area{
  display:flex;flex-direction:column;align-items:center;
  padding:2rem;background:var(--bg-warm);
  border:1px solid var(--border-light);border-radius:var(--radius);
  min-height:180px;margin-bottom:.6rem;
}
.preview-area canvas,.preview-area svg,.preview-area img{max-width:100%;border-radius:4px}
.preview-area .placeholder{color:var(--text-tertiary);font-size:.85rem}

/* ── Footer ── */
.site-footer{
  text-align:center;padding:1rem;
  border-top:1px solid var(--border-light);
  font-size:.78rem;color:var(--text-tertiary);
  background:var(--bg-warm);
}
.site-footer strong{color:var(--green-soft)}

/* ── Divider ── */
.divider{width:40px;height:2px;background:var(--border);margin:1rem 0;border-radius:2px}

/* ── Responsive ── */
@media(max-width:768px){
  .site-header{padding:.7rem 1rem}
  .site-header h1{font-size:.95rem}
  .lobby-hero{padding:2.5rem 1rem}
  .lobby-hero h2{font-size:1.5rem}
  .form-grid{grid-template-columns:1fr}
  .ad-slot{height:60px}
  .gen-card{padding:1.2rem}
}
@media(max-width:480px){
  .card-grid{grid-template-columns:1fr}
  .page-container{padding:1rem}
}