:root {
  --bg: #f5f5f7;
  --card-bg: #ffffff;
  --border: #e5e5ea;
  --text-main: #111;
  --text-sub: #6b6b6f;
  --shadow-soft: 0 2px 8px rgba(0,0,0,0.05);
  --radius-card: 16px;
  --font-ui: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans JP", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace;
}

body {
  margin: 0;
  background: var(--bg);
  font-family: var(--font-ui);
}

.page {
  padding: 24px;
  display: flex;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 840px;
  background: var(--card-bg);
  border-radius: 24px;
  padding: 28px 24px 32px;
  box-shadow: var(--shadow-soft);
}

.picker-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

/* SLパネル（HSV） */
.sl-panel {
  width: 300px;
  height: 300px;
  border-radius: 16px;
  position: relative;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-soft);

  background:
    linear-gradient(to top, #000, transparent),
    linear-gradient(to right, #fff, hsl(var(--hue), 100%, 50%));
}

.sl-thumb {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px rgba(0,0,0,0.35);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

/* Hueバー（横） */
.hue-slider {
  width: 300px;
  height: 24px;
  border-radius: 12px;
  background: linear-gradient(
    to right,
    #ff0000,
    #ffff00,
    #00ff00,
    #00ffff,
    #0000ff,
    #ff00ff,
    #ff0000
  );
  position: relative;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.hue-handle {
  position: absolute;
  top: -4px;
  width: 6px;
  height: 32px;
  background: #fff;
  border-radius: 3px;
  border: 1px solid #ccc;
  transform: translateX(-3px);
}

/* プレビュー */
.preview {
  width: 300px;
  height: 110px;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-inner {
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(6px);
  font-family: var(--font-mono);
}

/* 保存色 */
.saved-colors {
  width: 300px;
}

.saved-title {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 8px;
}

.saved-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.saved-item {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.save-btn {
  margin-top: 10px;
  width: 100%;
  padding: 10px;
  border-radius: 12px;
  border: none;
  background: #f3f3f5;
}

/* コード一覧 */
.codes-grid {
  margin-top: 24px;
  display: grid;
  gap: 16px;
}

.code-card {
  background: var(--card-bg);
  border-radius: var(--radius-card);
  border: 1px solid var(--border);
  padding: 14px;
}

.code-header {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-sub);
}

.code-body {
  margin-top: 6px;
  font-family: var(--font-mono);
}

.copy-btn {
  border: none;
  background: #f3f3f5;
  border-radius: 999px;
  padding: 4px 8px;
}

.copy-icon {
  width: 14px;
  height: 14px;
  fill: #6b6b6f;
}

.copy-btn.copied {
  background: #d1ffd1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --card-bg: #1c1c1e;
    --border: #2c2c2e;
    --text-main: #fff;
    --text-sub: #8e8e93;
    --shadow-soft: 0 2px 8px rgba(0,0,0,0.4);
  }

  body {
    background: var(--bg);
    color: var(--text-main);
  }

  .app {
    background: var(--card-bg);
  }

  .code-card {
    background: var(--card-bg);
    border-color: var(--border);
  }

  .preview-inner {
    background: rgba(0,0,0,0.4);
    color: var(--text-main);
  }

  .save-btn {
    background: #2c2c2e;
    color: var(--text-main);
  }

  .copy-btn {
    background: #2c2c2e;
  }
}