/* ================================
   密码生成器 - 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;
  --warning: #F59E0B;
  --danger: #EF4444;
  --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);
}
.panel:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.08); }

.panel-body { padding: 24px; }

/* ── Password Display ── */
.password-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.password-text {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
  flex: 1;
  letter-spacing: 0.03em;
}
.password-text.placeholder { color: var(--text-muted); font-size: 15px; font-weight: 400; }

.password-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn-refresh, .btn-copy-pwd {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-refresh:hover, .btn-copy-pwd:hover {
  background: var(--primary-light);
  border-color: rgba(79,70,229,0.25);
  color: var(--primary);
}

/* ── Strength Indicator ── */
.strength-section {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.strength-bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  border-radius: 100px;
  transition: width 0.3s ease, background 0.3s ease;
  width: 0;
}
.strength-fill.weak { width: 25%; background: var(--danger); }
.strength-fill.medium { width: 50%; background: var(--warning); }
.strength-fill.strong { width: 75%; background: #6366F1; }
.strength-fill.very-strong { width: 100%; background: var(--success); }

.strength-label {
  font-size: 12px;
  font-weight: 600;
  min-width: 48px;
  text-align: right;
}
.strength-label.weak { color: var(--danger); }
.strength-label.medium { color: var(--warning); }
.strength-label.strong { color: #6366F1; }
.strength-label.very-strong { color: var(--success); }

/* ── Config Groups ── */
.config-group {
  margin-bottom: 20px;
}

.config-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

/* ── Length Control ── */
.length-control {
  display: flex;
  align-items: center;
  gap: 14px;
}

.length-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--border);
  border-radius: 100px;
  outline: none;
}
.length-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--secondary);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(249,115,22,0.3);
  transition: transform 0.15s ease;
}
.length-slider::-webkit-slider-thumb:hover { transform: scale(1.1); }
.length-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--secondary);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 6px rgba(249,115,22,0.3);
}

.length-value {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: 4px 12px;
  background: var(--secondary);
  color: white;
  font-size: 14px;
  font-weight: 700;
  border-radius: 100px;
}

/* ── Checkbox Grid ── */
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 8px 0;
}

.checkbox-item input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-strong);
  border-radius: 6px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  position: relative;
}

.checkbox-item input:checked + .checkbox-custom {
  background: var(--secondary);
  border-color: var(--secondary);
}
.checkbox-item input:checked + .checkbox-custom::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 6px;
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checkbox-text {
  font-size: 14px;
  color: var(--text-secondary);
  user-select: none;
}
.checkbox-text code {
  padding: 1px 6px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: 'SF Mono', 'Cascadia Code', monospace;
  font-size: 11px;
  color: var(--text-muted);
}

/* ══════════════════════════════════════════
   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(249, 115, 22, 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, .guide-item-body code {
  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; }

  .password-display { flex-direction: column; align-items: stretch; }
  .password-actions { justify-content: center; }
  .password-text { font-size: 18px; text-align: center; }

  .checkbox-grid { grid-template-columns: 1fr 1fr; }
}