/* ================================
   图片取色器 - 自定义样式
   ================================ */

:root {
  --bg: #FAFAF9;
  --bg-alt: #F5F5F4;
  --surface: #FFFFFF;
  --border: #E7E5E4;
  --border-strong: #D6D3D1;
  --text: #1E293B;
  --text-secondary: #52525B;
  --text-muted: #71717A;
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: rgba(79, 70, 229, 0.08);
  --secondary: #F97316;
  --accent: #EC4899;
  --success: #059669;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.toast {
  position: fixed; top: 24px; right: 24px;
  background: var(--text); color: var(--bg);
  padding: 10px 18px; border-radius: 100px;
  font-size: 14px; font-weight: 500;
  display: flex; align-items: center; gap: 8px;
  z-index: 1000;
  transform: translateX(calc(100% + 40px));
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}
.toast.show { transform: translateX(0); }
.toast-dot { width: 8px; height: 8px; background: var(--success); border-radius: 50%; }

.page { max-width: 960px; margin: 0 auto; padding: 0 32px; }

#header.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

/* ── 上传区域 ── */
.picker-section { padding: 16px 0 32px; }

.picker-upload {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--surface);
}
.picker-upload:hover, .picker-upload.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}
.picker-upload.has-image { display: none; }

.picker-canvas-wrapper {
  position: relative;
  display: inline-block;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  cursor: crosshair;
  width: 100%;
  max-width: 600px;
}
.picker-canvas-wrapper canvas {
  display: block;
  width: 100%;
  height: auto;
}

.picker-magnifier {
  position: absolute;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 3px solid white;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  pointer-events: none;
  background-repeat: no-repeat;
  display: none;
  z-index: 10;
}

/* ── 取色结果 ── */
.picker-result {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.color-preview {
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  flex-shrink: 0;
}

.color-info-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.color-info-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.color-info-label {
  font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted);
  min-width: 36px;
}

.color-info-value {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 14px; font-weight: 600;
  color: var(--text);
  flex: 1;
}

.btn-copy-mini {
  padding: 4px 12px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit; font-size: 11px; font-weight: 500;
  color: var(--text-muted); cursor: pointer;
  transition: all 0.15s ease;
}
.btn-copy-mini:hover { background: var(--primary-light); border-color: rgba(79,70,229,0.25); color: var(--primary); }

/* ── 取色历史 ── */
.color-history { margin-bottom: 24px; }
.color-history-title {
  font-size: 14px; font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}
.color-history-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.history-color {
  width: 40px; height: 40px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
}
.history-color:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* ── 自定义滚动条 ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f5f9; }
::-webkit-scrollbar-thumb { background: #A5B4FC; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #4F46E5; }

::selection { background: rgba(79, 70, 229, 0.2); color: #1E293B; }

/* ── 使用说明手风琴 ── */
.guide-section {
  margin-top: 16px;
  margin-bottom: 64px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.guide-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px 20px;
  background: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}
.guide-toggle:hover { background: var(--bg-alt); }
.guide-toggle-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #1E293B;
}
.guide-toggle.open .toggle-arrow { transform: rotate(180deg); }
.toggle-arrow {
  transition: transform 0.2s ease;
  color: var(--text-muted);
}
.guide-list { padding: 0 20px 20px; }
.guide-list.hidden { display: none; }
.guide-item {
  padding: 16px 0;
  border-top: 1px solid var(--border);
}
.guide-item:first-child { border-top: 1px solid var(--border); }
.guide-item-title {
  font-size: 14px;
  font-weight: 600;
  color: #1E293B;
  margin-bottom: 6px;
}
.guide-item-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
  .page { padding: 0 16px; }
  .picker-result { flex-direction: column; align-items: flex-start; }
}