/* ===== リセット & 基本 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --orange:    #FF9E00;
  --orange-d:  #E08800;
  --orange-l:  #FFD066;
  --orange-bg: #FFF5E0;
  --cream:     #FFFBF0;
  --white:     #FFFFFF;
  --dark:      #2A2016;
  --gray:      #888877;
  --gray-l:    #EEE8D8;
  --radius:    16px;
  --shadow:    0 4px 20px rgba(0,0,0,0.12);
}

body {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  background: var(--cream);
  color: var(--dark);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== ヘッダー ===== */
header {
  background: linear-gradient(135deg, var(--orange) 0%, var(--orange-d) 100%);
  padding: 16px 24px;
  box-shadow: 0 4px 16px rgba(255,158,0,0.4);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 1200px;
  margin: 0 auto;
}
.header-logo {
  font-size: 2.2rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}
.header-text h1 {
  font-size: clamp(1rem, 3vw, 1.4rem);
  font-weight: 800;
  color: var(--white);
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.header-text p {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.85);
  margin-top: 2px;
}

/* ===== メイン ===== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

/* ===== アップロードエリア ===== */
#upload-section { margin-bottom: 24px; }

#drop-zone {
  background: var(--white);
  border: 3px dashed var(--orange-l);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: var(--shadow);
}
#drop-zone:hover, #drop-zone.dragover {
  border-color: var(--orange);
  background: var(--orange-bg);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255,158,0,0.25);
}
.drop-icon { font-size: 3rem; margin-bottom: 12px; }
.drop-title { font-size: 1.05rem; font-weight: 700; color: var(--dark); }
.drop-sub   { font-size: 0.8rem; color: var(--gray); margin-top: 6px; }

/* ===== メインコンテンツ ===== */
.hidden { display: none !important; }

.content-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 800px) {
  .content-grid { grid-template-columns: 1fr; }
}

/* ===== パネル共通 ===== */
.panel {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-header {
  background: linear-gradient(90deg, var(--orange-bg), var(--cream));
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--orange-l);
}
.panel-title {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--orange-d);
}

/* ===== ヘッダーコントロール ===== */
.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ===== ルーラーボタン ===== */
.ruler-btn {
  padding: 5px 10px;
  background: var(--gray-l);
  border: 2px solid var(--orange-l);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--dark);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.ruler-btn:hover { background: var(--orange-l); }
.ruler-btn.active {
  background: var(--orange);
  color: var(--white);
  border-color: var(--orange-d);
}

/* ===== ズームコントロール ===== */
.zoom-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.zoom-btn {
  width: 28px; height: 28px;
  background: var(--orange);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
  display: flex; align-items: center; justify-content: center;
}
.zoom-btn:hover { background: var(--orange-d); }
#zoom-label {
  font-size: 0.85rem;
  font-weight: 700;
  min-width: 28px;
  text-align: center;
  color: var(--dark);
}

/* ===== キャンバス ===== */
.canvas-wrapper {
  position: relative;
  overflow: auto;
  background:
    linear-gradient(45deg, #ccc 25%, transparent 25%),
    linear-gradient(-45deg, #ccc 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ccc 75%),
    linear-gradient(-45deg, transparent 75%, #ccc 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: #e8e8e8;
  max-height: 560px;
  cursor: crosshair;
}
#pixel-canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
#overlay-canvas {
  position: absolute;
  top: 0; left: 0;
  pointer-events: none;
  image-rendering: pixelated;
}
.img-info {
  font-size: 0.78rem;
  color: var(--gray);
  text-align: center;
  padding: 6px 8px;
  background: var(--orange-bg);
  font-weight: 700;
}
.hint-text {
  font-size: 0.78rem;
  color: var(--gray);
  text-align: center;
  padding: 8px;
}
.sub-btn {
  display: block;
  width: calc(100% - 32px);
  margin: 0 16px 16px;
  padding: 10px;
  background: var(--gray-l);
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--dark);
  cursor: pointer;
  transition: background 0.2s;
}
.sub-btn:hover { background: var(--orange-l); }

/* ===== カラー情報パネル ===== */
#info-panel { padding: 0; }

#no-select-msg {
  text-align: center;
  padding: 48px 16px;
  color: var(--gray);
}
.no-select-icon { font-size: 2.5rem; margin-bottom: 10px; }
#no-select-msg p { font-size: 0.9rem; line-height: 1.7; }

#color-info { padding: 0 0 16px; }

.info-block {
  padding: 14px 16px;
  border-bottom: 1px solid var(--gray-l);
}
.info-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--orange-d);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

/* ===== 選択色スウォッチ ===== */
.selected-color-row, .closest-row {
  display: flex;
  align-items: center;
  gap: 14px;
}
.swatch-big {
  width: 64px; height: 64px;
  border-radius: 12px;
  border: 3px solid rgba(0,0,0,0.1);
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: background-color 0.3s ease;
}
.color-codes, .closest-info {
  flex: 1;
}
.code-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}
.code-key {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--white);
  background: var(--orange);
  padding: 2px 6px;
  border-radius: 4px;
  min-width: 36px;
  text-align: center;
}
.code-val {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--dark);
  font-family: monospace;
}

/* ===== タブ ===== */
.tab-row {
  display: flex;
  gap: 0;
  padding: 12px 16px 0;
}
.tab-btn {
  flex: 1;
  padding: 10px 8px;
  border: 2px solid var(--orange-l);
  background: var(--gray-l);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--gray);
  cursor: pointer;
  transition: all 0.2s;
}
.tab-btn:first-child { border-radius: 10px 0 0 10px; }
.tab-btn:last-child  { border-radius: 0 10px 10px 0; }
.tab-btn.active {
  background: var(--orange);
  color: var(--white);
  border-color: var(--orange);
}
.mode-content { padding-top: 8px; }

/* ===== パレットグリッド ===== */
.palette-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 3px;
  margin-bottom: 8px;
}
.palette-cell {
  aspect-ratio: 1;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: default;
  transition: transform 0.15s;
  position: relative;
}
.palette-cell:hover { transform: scale(1.2); z-index: 2; }
.palette-cell.closest {
  border: 3px solid var(--dark);
  box-shadow: 0 0 0 2px var(--orange), 0 0 10px rgba(255,158,0,0.6);
  transform: scale(1.3);
  z-index: 3;
}
.palette-note {
  font-size: 0.72rem;
  color: var(--gray);
  margin-top: 4px;
}

/* ===== フルカラーガイド ===== */
.fullcolor-guide { display: flex; flex-direction: column; gap: 16px; }
.guide-section {}
.guide-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

/* 色相スライダー
   ゲーム内配置: ZL(左)=赤(0°) → 反時計回り → ZR(右)=赤(360°)
   赤→マゼンタ→青→シアン(中央)→緑→黄→赤
*/
.hue-slider-wrap {
  position: relative;
  margin-bottom: 6px;
}
.hue-slider-bar {
  height: 20px;
  border-radius: 10px;
  background: linear-gradient(to right,
    hsl(0,100%,50%),
    hsl(330,100%,50%),
    hsl(300,100%,50%),
    hsl(270,100%,50%),
    hsl(240,100%,50%),
    hsl(210,100%,50%),
    hsl(180,100%,50%),
    hsl(150,100%,50%),
    hsl(120,100%,50%),
    hsl(90,100%,50%),
    hsl(60,100%,50%),
    hsl(30,100%,50%),
    hsl(0,100%,50%)
  );
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
.hue-indicator {
  position: absolute;
  top: -4px;
  width: 28px; height: 28px;
  background: var(--white);
  border: 3px solid var(--dark);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  transition: left 0.3s ease;
}
.hue-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--gray);
  margin-top: 4px;
}
.guide-val {
  font-size: 0.82rem;
  color: var(--dark);
  margin-top: 4px;
}
.guide-val strong { color: var(--orange-d); }

/* SV正方形 */
.sv-square-wrap {
  position: relative;
  display: inline-block;
  width: 220px;
  height: 160px;
  border-radius: 8px;
  overflow: visible;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}
#sv-canvas {
  border-radius: 8px;
  display: block;
}
.sv-indicator {
  position: absolute;
  width: 16px; height: 16px;
  border: 3px solid var(--white);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 2px var(--dark), 0 2px 6px rgba(0,0,0,0.4);
  transition: left 0.3s ease, top 0.3s ease;
  pointer-events: none;
}
.sv-labels {
  font-size: 0.68rem;
  color: var(--gray);
  margin-top: 4px;
}
.sv-labels > div {
  display: flex;
  justify-content: space-between;
}

/* ステップボックス */
.steps-box {
  background: var(--orange-bg);
  border: 2px solid var(--orange-l);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.82rem;
  line-height: 1.8;
}
.steps-box .step { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 4px; }
.step-num {
  background: var(--orange);
  color: var(--white);
  width: 20px; height: 20px;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ===== フッター ===== */
footer {
  text-align: center;
  padding: 20px 16px;
  font-size: 0.8rem;
  color: var(--gray);
  border-top: 2px solid var(--gray-l);
}
footer a { color: var(--orange-d); text-decoration: none; font-weight: 700; }
footer a:hover { text-decoration: underline; }
.footer-note { font-size: 0.72rem; margin-top: 4px; }