:root {
  --bg: #faf7fc;
  --surface: #ffffff;
  --text: #3d3346;
  --muted: #8a7f94;
  --border: #ece5f1;
  --accent: #ff6fa5;
  --accent-soft: #ffe3ef;
  --shadow: 0 6px 24px rgba(90, 60, 120, 0.08);
  --radius: 16px;
  --mono: "JetBrains Mono", ui-monospace, "Consolas", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1a22;
    --surface: #27232e;
    --text: #f1ecf5;
    --muted: #a99fb3;
    --border: #3a3443;
    --accent: #ff8fb8;
    --accent-soft: #46303c;
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  }
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "M PLUS Rounded 1c", "Hiragino Maru Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

button, input, select { font: inherit; color: inherit; }

kbd {
  font-family: var(--mono);
  font-size: 0.75em;
  padding: 1px 6px;
  border-radius: 6px;
  border: 1px solid currentColor;
  opacity: 0.75;
}

/* ===== ヘッダー ===== */
.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 14px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.logo-dots { display: inline-flex; }
.logo-dots i {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid var(--surface);
  margin-left: -5px;
}
.logo-dots i:nth-child(1) { background: #ff8fb8; margin-left: 0; }
.logo-dots i:nth-child(2) { background: #ffd166; }
.logo-dots i:nth-child(3) { background: #8ecae6; }

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 800;
}
.field output { color: var(--text); }

.field input[type="color"] {
  width: 56px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3px;
  background: var(--surface);
  cursor: pointer;
}
.base-input {
  display: flex;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  overflow: hidden;
}
.base-input:focus-within { border-color: var(--accent); }
.base-input input[type="color"] {
  width: 40px;
  height: 100%;
  border: none;
  border-radius: 0;
  border-right: 1px solid var(--border);
  padding: 4px;
}
.base-input input[type="text"] {
  width: 92px;
  border: none;
  outline: none;
  background: transparent;
  padding: 0 10px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
}
.base-input input[type="text"].invalid { color: #e5484d; }
.base-input:has(.invalid) { border-color: #e5484d; }

.field select, .text-input {
  height: 36px;
  padding: 0 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 14px;
}
.field input[type="range"] { width: 120px; height: 36px; accent-color: var(--accent); }

.btn {
  height: 36px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.1s, background 0.2s;
  white-space: nowrap;
}
.btn:hover { background: var(--accent-soft); }
.btn:active { transform: scale(0.96); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.05); }

/* ===== パレット ===== */
main { flex: 1; padding: 24px 24px 16px; display: flex; flex-direction: column; gap: 24px; }

.intro,
.seo-help {
  margin: 0 auto;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.intro {
  text-align: center;
  display: grid;
  gap: 14px;
  padding: 24px 32px 26px;
}
.intro h2,
.seo-help h2 {
  font-size: 20px;
  font-weight: 800;
}
.intro p {
  width: 100%;
  max-width: none;
  margin: 0 auto;
  font-size: 14px;
  line-height: 1.9;
}
.intro .hint {
  width: 100%;
  margin-top: -2px;
  color: inherit;
  font-size: 14px;
  line-height: 1.9;
}
.seo-help {
  display: grid;
  gap: 12px;
  padding: 28px 36px 30px;
  line-height: 1.9;
}
.seo-help h2:not(:first-child) { margin-top: 10px; }
.seo-help ol { margin: 0; padding-left: 1.5em; }
.seo-help li { padding-left: 4px; }
.seo-help p { width: 100%; color: var(--muted); font-size: 13px; }

.palette {
  display: flex;
  height: min(52vh, 460px);
  min-height: 300px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.swatch {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  padding: 18px 8px 22px;
  transition: flex 0.25s ease, background-color 0.35s ease;
  min-width: 0;
}
.swatch:hover { flex: 1.25; }

.swatch .tools {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: auto;
  opacity: 0;
  transition: opacity 0.2s;
}
.swatch:hover .tools,
.swatch:focus-within .tools,
.swatch .tools:has(.on) { opacity: 1; }
.swatch .info { display: flex; flex-direction: column; align-items: center; gap: 6px; }

.icon-btn {
  width: 36px; height: 36px;
  border-radius: 10px;
  border: none;
  background: transparent;
  cursor: pointer;
  display: grid;
  place-items: center;
  color: inherit;
  position: relative;
  transition: background 0.15s;
}
.icon-btn:hover { background: rgba(127, 127, 127, 0.2); }
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn input[type="color"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}

.hex {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(14px, 1.8vw, 22px);
  letter-spacing: 0.04em;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
}
.hex:hover { background: rgba(127, 127, 127, 0.18); }

.meta {
  font-family: var(--mono);
  font-size: 11px;
  opacity: 0.8;
  text-align: center;
  line-height: 1.5;
}

.badges { display: flex; gap: 4px; flex-wrap: wrap; justify-content: center; }
.badge {
  font-size: 10px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 999px;
  border: 1px solid currentColor;
  font-family: var(--mono);
}
.badge.ng { opacity: 0.45; text-decoration: line-through; }

/* ===== パネル ===== */
.panel-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.span-2 { grid-column: span 2; }
@media (max-width: 1100px) {
  .panel-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}
.panel h2 { font-size: 16px; font-weight: 800; }
.hint { font-size: 12px; color: var(--muted); margin-top: -6px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.text-input { flex: 1; min-width: 140px; }

.shades { display: flex; flex-direction: column; gap: 6px; }
.shade-row { display: flex; border-radius: 10px; overflow: hidden; }
.shade-row button {
  flex: 1;
  height: 32px;
  border: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 9px;
  color: transparent;
  transition: color 0.15s;
}
.shade-row button:hover { color: inherit; }

/* プレビュー */
.preview {
  border-radius: 12px;
  padding: 18px;
  transition: background 0.35s;
}
.pv-card {
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  transition: background 0.35s, color 0.35s;
}
.pv-header { display: flex; gap: 10px; align-items: center; }
.pv-avatar { width: 38px; height: 38px; border-radius: 50%; flex-shrink: 0; }
.pv-title { font-weight: 800; }
.pv-sub, .pv-body { font-size: 12px; opacity: 0.8; }
.pv-tags { display: flex; gap: 6px; }
.pv-tags span { font-size: 11px; font-weight: 800; padding: 3px 10px; border-radius: 999px; }
.pv-actions { display: flex; gap: 8px; }
.pv-btn {
  border: none;
  border-radius: 999px;
  padding: 8px 16px;
  font-weight: 800;
  font-size: 13px;
  cursor: default;
}
.pv-btn.ghost { background: transparent; border: 2px solid currentColor; }

/* エクスポート */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tab {
  border: none;
  background: transparent;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  color: var(--muted);
}
.tab.active { background: var(--accent-soft); color: var(--accent); }
.code {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  overflow-x: auto;
  max-height: 220px;
  line-height: 1.6;
}

/* 保存リスト */
.saved { list-style: none; display: flex; flex-direction: column; gap: 8px; max-height: 300px; overflow-y: auto; }
.saved li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
}
.saved li:hover { background: var(--accent-soft); }
.saved .mini { display: flex; flex: 0 0 120px; height: 28px; border-radius: 8px; overflow: hidden; }
.saved .mini span { flex: 1; }
.saved .name { flex: 1; font-size: 13px; font-weight: 800; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.saved .empty { color: var(--muted); font-size: 13px; border: none; cursor: default; }
.saved .empty:hover { background: none; }

.footer {
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  padding: 16px;
}

/* トースト */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 20px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 100;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast i { width: 14px; height: 14px; border-radius: 4px; display: inline-block; }

/* ===== スマホ ===== */
@media (max-width: 720px) {
  .topbar { padding: 12px 16px; }
  main { padding: 16px; gap: 20px; }
  .intro { padding: 20px 18px 22px; }
  .intro h2, .seo-help h2 { font-size: 18px; }
  .seo-help { padding: 22px 20px 24px; }
  .palette { flex-direction: column; height: auto; min-height: 0; }
  .swatch {
    flex-direction: row;
    justify-content: space-between;
    padding: 10px 12px;
    min-height: 84px;
  }
  .swatch:hover { flex: 1; }
  .swatch .tools { flex-direction: row; order: 3; margin: 0; opacity: 1; }
  .swatch .info { display: flex; flex-direction: column; align-items: flex-start; }
  .meta { text-align: left; }
  .badges { justify-content: flex-start; }
  .panel-grid { grid-template-columns: 1fr; }
  .span-2 { grid-column: auto; }
}

/* ===== ひらめきパレット ===== */
.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.panel-head .hint { margin-top: 6px; }
.ai-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.ai-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  text-align: left;
  transition: transform 0.15s, box-shadow 0.15s;
  animation: pop-in 0.3s ease both;
}
.ai-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.ai-card .strip { display: flex; height: 110px; }
.ai-card .strip span { flex: 1; transition: flex 0.2s; }
.ai-card:hover .strip span:hover { flex: 1.8; }
.ai-card .ai-name {
  display: block;
  padding: 10px 14px 4px;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.4;
}
.ai-card .ai-hex {
  display: block;
  padding: 0 14px 12px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
@keyframes pop-in {
  from { opacity: 0; transform: translateY(6px) scale(0.98); }
  to { opacity: 1; transform: none; }
}