/* ================================
   UUID 生成器 - 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 ── */
.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 ── */
.page { max-width: 960px; margin: 0 auto; padding: 0 32px; }

/* ── Header scroll effect ── */
#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);
}

/* ══════════════════════════════════════════
   Generator Section
   ══════════════════════════════════════════ */
.generator-section { padding: 8px 0 32px; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s ease;
}
.panel:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

.panel-body { padding: 24px; }

/* ── Control Bar ── */
.control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

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

.control-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.quantity-selector {
  display: flex;
  gap: 4px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 3px;
}

.qty-option {
  padding: 6px 14px;
  background: transparent;
  border: none;
  border-radius: 100px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}
.qty-option:hover { color: var(--text); }
.qty-option.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.control-actions {
  display: flex;
  gap: 10px;
}

.btn-generate {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  border: none;
  border-radius: 100px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: white;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}
.btn-generate:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}
.btn-generate:active { transform: translateY(0); }

.btn-copy-all {
  padding: 10px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease;
}
.btn-copy-all:hover {
  background: var(--primary-light);
  border-color: rgba(79,70,229,0.25);
  color: var(--primary);
}

/* ── Version Badge ── */
.version-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding: 10px 16px;
  background: linear-gradient(135deg, rgba(99,102,241,0.06), rgba(139,92,246,0.06));
  border: 1px solid rgba(99,102,241,0.12);
  border-radius: var(--radius);
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  background: linear-gradient(135deg, #6366F1, #8B5CF6);
  color: white;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
  white-space: nowrap;
}

.version-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ── UUID List ── */
.uuid-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.uuid-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
}

.uuid-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-bottom: none;
  background: var(--bg-alt);
  transition: all 0.2s ease;
}
.uuid-item:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.uuid-item:last-child { border-bottom: 1px solid var(--border); border-radius: 0 0 var(--radius) var(--radius); }
.uuid-item:hover { background: var(--surface); }

.uuid-index {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 24px;
  text-align: right;
}

.uuid-value {
  flex: 1;
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 14px;
  color: var(--text);
  word-break: break-all;
}

.uuid-copy-btn {
  padding: 5px 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.uuid-copy-btn:hover {
  background: var(--primary-light);
  border-color: rgba(79,70,229,0.25);
  color: var(--primary);
}

/* ══════════════════════════════════════════
   Custom scrollbar
   ══════════════════════════════════════════ */
::-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; }

/* ══════════════════════════════════════════
   Guide Section (accordion)
   ══════════════════════════════════════════ */
.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;
}
.guide-item-body kbd {
  padding: 1px 6px;
  background: var(--bg-alt);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-family: 'SF Mono', 'Cascadia Code', monospace;
  font-size: 12px;
  color: var(--text-secondary);
}

/* ══════════════════════════════════════════
   Responsive
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .page { padding: 0 16px; }

  .control-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .control-actions {
    width: 100%;
    flex-direction: column;
  }

  .btn-generate, .btn-copy-all {
    justify-content: center;
  }

  .version-badge {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}