:root {
  --bg: radial-gradient(circle at top, #fdfbff 0, #e6edf7 40%, #d8e0f0 100%);
  --panel: rgba(255,255,255,0.82);
  --panel-blur: blur(26px);

  --text: #1a1c23;
  --subtext: #4a4f59;

  --border: rgba(255,255,255,0.9);
  --border-soft: rgba(148,163,184,0.45);

  --accent: #2563eb;
  --accent-soft: rgba(37,99,235,0.16);

  --radius-lg: 22px;
  --radius-md: 14px;
  --shadow-soft: 0 18px 40px rgba(15,23,42,0.16);
  --vh: 1vh;
}

:root[data-theme="dark"] {
  --bg: radial-gradient(circle at top, #020617 0, #020617 100%);
  --panel: rgba(15,23,42,0.9);
  --panel-blur: blur(30px);

  --text: #9ca3af;
  --subtext: #c3c7d1;

  --border: rgba(148,163,184,0.7);
  --border-soft: rgba(56,78,180,0.7);

  --accent: #60a5fa;
  --accent-soft: rgba(96,165,250,0.25);

  --shadow-soft: 0 24px 60px rgba(0,0,0,0.75);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  min-height: calc(var(--vh) * 100);
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans JP", sans-serif;
  padding: 16px 0 90px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 0 16px;
}

h1 {
  font-size: 24px;
  margin: 8px 0 4px;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 13px;
  color: var(--subtext);
  margin-bottom: 16px;
}

.panel {
  background: var(--panel);
  backdrop-filter: var(--panel-blur);
  -webkit-backdrop-filter: var(--panel-blur);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  padding: 16px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid var(--border-soft);
  pointer-events: none;
  mix-blend-mode: soft-light;
}

.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(to bottom, rgba(255,255,255,0.35), transparent 40%);
  opacity: 0.7;
  pointer-events: none;
}

.panel-inner {
  position: relative;
  z-index: 1;
}

label {
  font-size: 11px;
  font-weight: 600;
  color: var(--subtext);
  margin-bottom: 6px;
  display: block;
  letter-spacing: 0.05em;
}

input,
select {
  width: 100%;
  padding: 10px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148,163,184,0.5);
  background: rgba(255,255,255,0.9);
  font-size: 13px;
  outline: none;
  backdrop-filter: blur(6px);
}

input:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

.input-row {
  display: flex;
  gap: 8px;
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.btn {
  flex: 1;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.6);
  background: rgba(255,255,255,0.95);
  font-size: 13px;
  color: var(--subtext);
  cursor: pointer;
  text-align: center;
  transition: 0.2s ease;
}

.btn:hover {
  background: rgba(255,255,255,1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #4f46e5);
  color: #fff;
  border: none;
  box-shadow: 0 10px 24px rgba(37,99,235,0.35);
}

.btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.palette-card {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(148,163,184,0.4);
  background: rgba(255,255,255,0.9);
  cursor: pointer;
  transition: 0.2s ease;
}

.palette-card:hover {
  transform: translateY(-2px);
}

.palette-card.dragging {
  opacity: 0.6;
  transform: scale(0.98);
}

.palette-card.drop-target {
  outline: 2px dashed rgba(148,163,184,0.8);
}

.palette-swatch {
  height: 70px;
}

.palette-meta {
  padding: 6px 8px;
  font-size: 11px;
  color: var(--subtext);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.palette-meta code {
  font-family: monospace;
}

.tag {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 999px;
  background: rgba(148,163,184,0.15);
}

.palette-name {
  margin-top: 8px;
  font-size: 12px;
  color: var(--subtext);
}

.wcag-result {
  margin-top: 10px;
  font-size: 13px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(148,163,184,0.4);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 12px;
  background: rgba(255,255,255,0.7);
  border: 1px solid rgba(148,163,184,0.4);
  cursor: pointer;
  font-size: 11px;
  color: var(--subtext);
}

.history-swatches {
  display: flex;
  gap: 2px;
}

.history-swatch {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid rgba(15,23,42,0.12);
}

.bottom-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 70px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(20px);
  border-top: 1px solid rgba(148,163,184,0.4);
}

.bottom-inner {
  max-width: 520px;
  margin: 0 auto;
  display: flex;
  gap: 8px;
}

@media (max-width: 480px) {
  h1 {
    font-size: 22px;
  }
  .palette-swatch {
    height: 60px;
  }
}

/* ===== Select Box Visibility Fix ===== */
select {
  color: var(--text);                 /* 文字色を明確に */
  background: rgba(255,255,255,0.9);  /* 背景を白寄りにしてコントラストUP */
  border: 1px solid rgba(148,163,184,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ダークモード時のセレクトボックス */
:root[data-theme="dark"] select {
  background: rgba(30,41,59,0.85);    /* 濃い背景で文字を浮かせる */
  color: var(--text);
  border: 1px solid rgba(148,163,184,0.6);
}

/* option の文字色も明確に */
select option {
  color: #1a1c23;                     /* ライトテーマ用 */
  background: #ffffff;
}

:root[data-theme="dark"] select option {
  color: #f3f4f6;                     /* ダークテーマ用 */
  background: #1e293b;
}