/* 全局自定义弹窗（alert / confirm / prompt） */
:root {
  --modal-overlay: rgba(0, 0, 0, 0.2);
  --modal-bg: #fff;
  --modal-border: rgba(0, 0, 0, 0.08);
  --modal-text: #14171d;
  --modal-text-secondary: #4b5563;
  --modal-text-muted: #6b7280;
  --modal-accent: #1d4ed8;
  --modal-focus-ring: rgba(29, 78, 216, 0.2);
  --modal-radius: 12px;
  --modal-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
  --modal-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="dark"] {
  --modal-overlay: rgba(0, 0, 0, 0.55);
  --modal-bg: #1a1e26;
  --modal-border: rgba(255, 255, 255, 0.1);
  --modal-text: #f3f4f6;
  --modal-text-secondary: #d1d5db;
  --modal-text-muted: #9ca3af;
  --modal-accent: #60a5fa;
  --modal-focus-ring: rgba(96, 165, 250, 0.25);
  --modal-shadow: 0 20px 40px rgba(0, 0, 0, 0.45);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.22s var(--modal-ease), visibility 0.22s var(--modal-ease);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.modal-box {
  background: var(--modal-bg);
  border: 1px solid var(--modal-border);
  border-radius: var(--modal-radius);
  box-shadow: var(--modal-shadow);
  width: 100%;
  max-width: 420px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.97);
  transform-origin: center center;
  transition: opacity 0.22s var(--modal-ease), transform 0.22s var(--modal-ease), visibility 0.22s var(--modal-ease);
  pointer-events: none;
}

.modal-overlay.show .modal-box {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0;
}

.modal-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--modal-text);
}

.modal-close {
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--modal-text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--modal-text);
}

.modal-body {
  padding: 16px 24px 8px;
}

.modal-message {
  margin: 0;
  font-size: 0.9rem;
  color: var(--modal-text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
}

.modal-submessage {
  font-size: 0.8125rem;
  color: var(--modal-text-muted);
  line-height: 1.5;
  margin: 8px 0 0;
}

.modal-submessage[hidden] { display: none !important; }

.modal-input {
  width: 100%;
  margin-top: 12px;
  padding: 10px 14px;
  border: 1px solid var(--modal-border);
  border-radius: 10px;
  font-size: 0.9rem;
  color: var(--modal-text);
  background: var(--modal-bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.modal-input:focus {
  outline: none;
  border-color: var(--modal-accent);
  box-shadow: 0 0 0 3px var(--modal-focus-ring);
}

.modal-input.shake {
  animation: modalShake 0.4s ease;
}

@keyframes modalShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px 24px 20px;
}

.modal-footer .btn {
  border: 0;
  border-radius: 10px;
  padding: 9px 16px;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.modal-footer .btn-primary {
  background: var(--modal-accent);
  color: #fff;
}

.modal-footer .btn-primary:hover {
  filter: brightness(1.05);
}

.modal-footer .btn-ghost {
  background: transparent;
  color: var(--modal-text-secondary);
}

.modal-footer .btn-ghost:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--modal-text);
}

.modal-footer .btn-outline {
  background: transparent;
  color: var(--modal-text);
  border: 1px solid var(--modal-border);
}

.modal-footer .btn-outline:hover {
  background: rgba(0, 0, 0, 0.04);
}

.modal-footer .btn-sm {
  min-height: 36px;
}