:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-2: #fbfbfc;
  --text: #1b1f24;
  --text-soft: #3d4450;
  --muted: #737b88;
  --border: #e6e8ec;
  --border-strong: #d8dbe1;
  --accent: #2f6bff;
  --accent-hover: #245ae6;
  --accent-soft: #eaf0ff;
  --accent-text: #ffffff;
  --danger: #e5484d;
  --danger-soft: #fdecec;
  --success: #1a9d61;
  --code-bg: #f6f7f9;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-md: 0 10px 30px rgba(16, 24, 40, 0.08);
  --radius: 14px;
  --radius-sm: 9px;
  --sidebar-width: 280px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1014;
  --panel: #15181e;
  --panel-2: #191d24;
  --text: #e9edf3;
  --text-soft: #c7ced9;
  --muted: #8b95a5;
  --border: #262c36;
  --border-strong: #333b48;
  --accent: #4c83ff;
  --accent-hover: #3a72f0;
  --accent-soft: #1b2740;
  --danger: #ff6369;
  --danger-soft: #33191b;
  --success: #3dd68c;
  --code-bg: #101319;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 14px 40px rgba(0, 0, 0, 0.35);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: 0;
  background: none;
}

a {
  color: var(--accent);
  text-decoration: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

::selection {
  background: var(--accent-soft);
  color: var(--text);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
  border: 3px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-track {
  background: transparent;
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 38px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  background: var(--panel-2);
  border-color: var(--border-strong);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-danger {
  color: var(--danger);
  border-color: var(--border);
}

.btn-danger:hover {
  background: var(--danger-soft);
  border-color: var(--danger);
}

.btn-ghost {
  border-color: transparent;
  background: transparent;
}

.btn-ghost:hover {
  background: var(--panel-2);
  border-color: var(--border);
}

.btn-sm {
  height: 32px;
  padding: 0 10px;
  font-size: 13px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

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

.field .hint {
  font-size: 12px;
  color: var(--muted);
}

.input,
.textarea,
.select {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.textarea {
  resize: vertical;
  min-height: 88px;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  color: var(--text-soft);
  cursor: pointer;
}

.checkbox input {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}

.alert {
  display: flex;
  gap: 10px;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.5;
  background: var(--danger-soft);
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 22%, transparent);
}

.alert-info {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 22%, transparent);
}

.alert-success {
  background: color-mix(in srgb, var(--success) 12%, transparent);
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 24%, transparent);
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.toast-stack {
  position: fixed;
  right: 20px;
  bottom: 22px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  min-width: 200px;
  max-width: 360px;
  padding: 12px 15px;
  border-radius: 11px;
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  font-size: 13.5px;
  color: var(--text-soft);
  animation: toast-in 0.18s ease;
}

.toast.error {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 28%, transparent);
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(10, 14, 20, 0.45);
  backdrop-filter: blur(3px);
}

.modal {
  width: 100%;
  max-width: 460px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow-md);
  padding: 22px;
}

.modal h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.modal p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13.5px;
}

.modal .actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 56px 20px;
  text-align: center;
  color: var(--muted);
}

.empty-state strong {
  color: var(--text-soft);
  font-size: 15px;
}