:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --border: #e1e5eb;
  --accent: #2563eb;
  --accent-light: #dbeafe;
  --success: #16a34a;
  --success-light: #dcfce7;
  --error: #dc2626;
  --text: #1f2937;
  --text-dim: #6b7280;
  --font: system-ui, -apple-system, sans-serif;
  --mono: "SF Mono", "Fira Code", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

.tagline {
  color: var(--text-dim);
  margin-top: 4px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.card-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  flex: 1;
}

.step {
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.hint {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 12px;
}

/* 帮助说明框 */
.help-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 16px;
}

.help-box summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  user-select: none;
  list-style: none;
}

.help-box summary::-webkit-details-marker {
  display: none;
}

.help-box[open] summary {
  margin-bottom: 12px;
}

.help-content {
  padding-left: 8px;
}

.help-content dl {
  display: grid;
  gap: 10px;
}

.help-content dt {
  color: var(--text);
  font-size: 0.9rem;
  margin-bottom: 2px;
}

.help-content dd {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
  margin-left: 0;
  padding-left: 16px;
  border-left: 2px solid var(--border);
}

/* 基础配置网格 */
.base-config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  padding: 4px 0;
}

.base-config-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.base-config-grid label span {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
}

.base-config-grid input,
.base-config-grid select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  background: var(--surface);
}

.base-config-grid input:focus,
.base-config-grid select:focus {
  outline: none;
  border-color: var(--accent);
}

.input-methods {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.url-input-group {
  display: flex;
  gap: 10px;
  flex: 1;
  min-width: 280px;
}

.url-input-group input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: var(--mono);
  background: var(--surface-2);
}

.url-input-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.divider {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.file-upload {
  cursor: pointer;
}

.file-upload input {
  display: none;
}

.btn-primary {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-sm {
  padding: 6px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

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

.status {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
}

.status.success {
  background: var(--success-light);
  color: var(--success);
}

.status.error {
  background: #fef2f2;
  color: var(--error);
}

/* 节点列表 */
.proxy-list {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 120px;
  overflow-y: auto;
  padding: 8px;
  background: var(--surface-2);
  border-radius: 8px;
}

.proxy-tag {
  padding: 4px 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* 代理组 */
.group-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
}

.group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.group-header input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-weight: 600;
}

.group-header select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}

.group-proxies {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* 手动添加节点 */
.manual-proxy-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
}

.manual-proxy-item .proxy-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.manual-proxy-item input,
.manual-proxy-item select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  background: var(--surface);
}

.manual-proxy-item input { flex: 1; min-width: 100px; }

.manual-proxy-item .field-group {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.manual-proxy-item .field-group label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.manual-proxy-item .field-group input {
  width: 100%;
}

.proxy-checkbox {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}

.proxy-checkbox:hover {
  border-color: var(--accent);
}

.proxy-checkbox.selected {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.proxy-checkbox input { display: none; }

/* 规则列表 */
.rule-category {
  margin-bottom: 16px;
}

.rule-category h3 {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.rule-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
}

.rule-row:last-child {
  border-bottom: none;
}

.rule-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  cursor: pointer;
  font-size: 0.9rem;
}

.rule-row select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  background: var(--surface);
  min-width: 120px;
}

.rule-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

/* 输出 */
.code-block {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.6;
  overflow: auto;
  max-height: 400px;
  white-space: pre;
  margin-top: 12px;
}

@media (max-width: 640px) {
  .url-input-group { flex-direction: column; }
  .card-header { flex-wrap: wrap; }
  .rule-row { flex-wrap: wrap; }
}