:root {
  --bg: #f7f5f0;
  --card-bg: #ffffff;
  --text: #23201b;
  --text-sub: #6b645a;
  --border: #e5e0d6;
  --accent: #c8502d;
  --accent-text: #ffffff;
  --tile-stroke: rgba(255, 255, 255, 0.55);
  --sector-label: #6b645a;
  --neutral: #d9d4c8;
  /* 日本式: 値上がり=赤 / 値下がり=緑 */
  --gain: #d64545;
  --loss: #2f9e6b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1a17;
    --card-bg: #262320;
    --text: #f0ece4;
    --text-sub: #a89f92;
    --border: #38342e;
    --accent: #e0662f;
    --accent-text: #1c1a17;
    --tile-stroke: rgba(0, 0, 0, 0.45);
    --sector-label: #a89f92;
    --neutral: #4a453d;
    --gain: #e0605f;
    --loss: #46b483;
  }
}

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

body {
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN",
    "Yu Gothic", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding: 1rem 1rem 3rem;
}

header, main, footer { max-width: 68rem; margin: 0 auto; }

.head-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.title-block {
  display: flex;
  align-items: baseline;
  gap: 0.35rem 0.9rem;
  flex-wrap: wrap;
}

h1 { font-size: 1.35rem; letter-spacing: 0.01em; }

.index-quote {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-sub);
}
.index-quote .idx-label { font-weight: 700; }
.index-quote .idx-price {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.index-quote .idx-change {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.index-quote .idx-change.up { color: var(--gain); }
.index-quote .idx-change.down { color: var(--loss); }
.index-quote .idx-change.flat { color: var(--text-sub); }

.portal-link {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
}
.portal-link:hover { text-decoration: underline; }

.meta {
  color: var(--text-sub);
  font-size: 0.85rem;
  margin-top: 0.25rem;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.meta .sep { margin: 0 0.4rem; opacity: 0.5; }

.refresh-btn {
  font: inherit;
  font-size: 0.8rem;
  padding: 0.15rem 0.6rem;
  margin-right: 0.3rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-sub);
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: border-color 0.12s ease, color 0.12s ease;
}
.refresh-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--text); }
.refresh-btn:disabled { cursor: default; opacity: 0.7; }

.refresh-icon { display: inline-block; }
.refresh-icon.spinning { animation: refresh-spin 0.8s linear infinite; }
@keyframes refresh-spin {
  to { transform: rotate(360deg); }
}

.refresh-message { font-size: 0.8rem; font-weight: 700; }
.refresh-message.success { color: var(--text-sub); }
.refresh-message.info { color: var(--accent); }
.refresh-message.error { color: var(--accent); }

.controls {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.9rem;
}

.controls button {
  font: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-sub);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}
.controls button:hover { border-color: var(--accent); }
.controls button.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  font-weight: 700;
}

main { margin-top: 1rem; }

#chart {
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  overflow: hidden;
}

#chart svg { display: block; width: 100%; height: auto; }

.tile { cursor: pointer; stroke: var(--tile-stroke); stroke-width: 0.5; }
.tile:hover { stroke: var(--text); stroke-width: 1.2; }

.tile-label {
  font-size: 10px;
  pointer-events: none;
  font-weight: 600;
}
.tile-sub {
  font-size: 9px;
  opacity: 0.9;
  pointer-events: none;
}

.sector-label {
  font-size: 11px;
  fill: var(--sector-label);
  font-weight: 700;
  pointer-events: none;
}

.status {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-sub);
  font-size: 0.9rem;
}

.legend {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.9rem;
  font-size: 0.8rem;
  color: var(--text-sub);
  flex-wrap: wrap;
}
.legend-bar {
  width: 12rem;
  max-width: 45vw;
  height: 0.7rem;
  border-radius: 999px;
  background: linear-gradient(to right,
    var(--loss) 0%, var(--neutral) 50%, var(--gain) 100%);
}
.legend-scale { width: 100%; color: var(--text-sub); opacity: 0.8; }

footer {
  margin-top: 1.5rem;
  font-size: 0.78rem;
  color: var(--text-sub);
  line-height: 1.7;
}
footer p + p { margin-top: 0.4rem; }

.tooltip {
  position: fixed;
  z-index: 10;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.55rem 0.75rem;
  font-size: 0.82rem;
  line-height: 1.5;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
  pointer-events: none;
  max-width: 15rem;
}
.tooltip strong { font-size: 0.9rem; }
.tooltip .chg-up { color: var(--gain); font-weight: 700; }
.tooltip .chg-down { color: var(--loss); font-weight: 700; }