:root{
  --bg-1: #f3efe6;
  --bg-2: #efe6d9;

  --ink: #242424;
  --ink-soft: #555;

  --paper: #faf6ee;
  --paper-2: #f4eedf;
  --border: #dbcdb7;

  --btn: #efe5d2;
  --btn-hover: #e4d7bf;
  --btn-border: #bfa77e;

  --indigo: #2b4c7e;
  --vermilion: #b23a2c;

  --shadow: 0 10px 24px rgba(0,0,0,.10);
  --radius: 16px;
  --focus: 0 0 0 4px rgba(43,76,126,.22);

  --board-bg: #d7b47a;
  --board-bg-2: #cfa96c;
}

*{ box-sizing: border-box; }
html, body{ margin:0; padding:0; }

body{
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans JP", sans-serif;
  line-height: 1.6;

  background:
    radial-gradient(1200px 700px at 15% -10%, rgba(180,138,85,.18), transparent 60%),
    radial-gradient(900px 600px at 95% 10%, rgba(43,76,126,.12), transparent 55%),
    repeating-linear-gradient(
      45deg,
      rgba(0,0,0,.015) 0px,
      rgba(0,0,0,.015) 2px,
      rgba(255,255,255,0) 2px,
      rgba(255,255,255,0) 10px
    ),
    linear-gradient(180deg, var(--bg-1), var(--bg-2));

  overflow-x: hidden;
}

/* ===== レイアウト ===== */

.page{
  width: min(980px, 94vw);
  margin: 22px auto 30px;
}

.header{ margin: 6px 0 14px; }

.brand{ display:flex; flex-direction:column; gap:4px; }
.brand__title{ font-size: 20px; font-weight: 900; letter-spacing: .02em; }
.brand__sub{ font-size: 13px; color: var(--ink-soft); }

.card{
  background:
    radial-gradient(900px 500px at 20% 0%, rgba(255,255,255,.55), transparent 60%),
    linear-gradient(180deg, var(--paper), var(--paper-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  margin: 14px 0;
}

.board-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.hint{
  flex:1;
  font-size: 12px;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

/* 右上ズーム（余白を少し） */
.zoom{
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding-right: 6px;
}

/* ===== 盤（木枠撤去版） ===== */

#board-wrapper{
  position: relative;
  margin: 0 auto;

  padding: 0;
  background: transparent;
  border-radius: 0;
  box-shadow: none;

  width: 100%;
  max-width: min(720px, calc(100vw - 12px));
  overflow: visible;
}

#board{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio: 1 / 1;
  background: linear-gradient(180deg, var(--board-bg), var(--board-bg-2));
  border-radius: 0;
}

/* ===== 変化図番号 ===== */

.variation-btn{
  position:absolute;
  transform: translate(-50%, -50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display:grid;
  place-items:center;

  background: #ff8c2a;
  color:#fff;
  border: 1px solid #333;
  box-shadow: 0 1px 3px rgba(0,0,0,0.4);

  font-size: 14px;
  font-weight: 900;
  cursor:pointer;
  z-index: 20;
}

/* コメント or 変化名がある変化番号に小点マーク */
.variation-btn.has-note::after{
  content:"";
  position:absolute;
  right: 3px;
  top: 3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid #111;
  box-shadow: 0 1px 2px rgba(0,0,0,0.35);
}

/* ===== ボタン ===== */

.btn{
  appearance:none;
  border: 2px solid var(--btn-border);
  background: linear-gradient(180deg, #fff8eb, var(--btn));
  color: var(--ink);
  border-radius: 12px;

  padding: 12px 16px;
  font-size: 16px;
  font-weight: 900;

  cursor:pointer;
  box-shadow: 0 4px 0 rgba(0,0,0,.18);
  transition: transform .05s ease, background .12s ease, box-shadow .12s ease;
}

.btn:hover{ background: linear-gradient(180deg, #fff, var(--btn-hover)); }
.btn:active{ transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,.18); }
.btn:focus{ outline:none; box-shadow: var(--focus), 0 4px 0 rgba(0,0,0,.18); }

.btn--primary{
  border-color: color-mix(in srgb, var(--indigo) 75%, var(--btn-border));
}
.btn--danger{
  border-color: color-mix(in srgb, var(--vermilion) 75%, var(--btn-border));
}
.btn--ghost{
  font-size: 14.5px;
  padding: 10px 12px;
}

/* ===== 操作ボタンの整列 ===== */

.controls{
  display:flex;
  justify-content:center;
  align-items:center;
  gap: 14px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.controls__group{
  display:inline-flex;
  gap: 10px;
  align-items:center;
  flex-wrap: wrap;
}

.controls__divider{
  width: 18px;
  height: 1px;
  background: color-mix(in srgb, var(--border) 85%, transparent);
  margin: 0 6px;
}

/* ===== SGF ===== */

.sgf-head{
  display:flex;
  align-items:baseline;
  gap:10px;
  margin-bottom: 10px;
}
.sgf-title{ font-weight: 900; font-size: 14px; letter-spacing: .02em; }
.sgf-desc{ font-size: 12px; color: var(--ink-soft); }

.sgf-text{
  width: 100%;
  border-radius: 14px;
  border: 2px solid var(--border);
  padding: 12px;
  font-size: 13px;
  line-height: 1.7;
  background: #fffaf2;
}

.sgf-actions{
  display:flex;
  justify-content:center;
  align-items:center;
  gap: 14px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.sgf-actions__left,
.sgf-actions__right{
  display:inline-flex;
  gap: 10px;
  align-items:center;
  flex-wrap: wrap;
}

.sgf-actions__spacer{
  width: 18px;
  height: 1px;
  background: color-mix(in srgb, var(--border) 85%, transparent);
  margin: 0 6px;
}

.footer{
  margin-top: 18px;
  color: var(--ink-soft);
  text-align: center;
}

/* ===== スマホ微調整 ===== */
@media (max-width: 520px){
  .page{ width: 96vw; }
  .btn{ padding: 12px 14px; }
  .controls{ gap: 12px; }
  .sgf-actions{ gap: 12px; }
  .zoom{ padding-right: 4px; }
}