:root {
  --bg-color: #0d1117;
  --bg-secondary: #161b22;
  --border-color: #30363d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --accent-color: #238636;
  --accent-hover: #2ea043;
  --input-bg: #0d1117;
  --header-bg: #010409;
  --tab-active: #f85149;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg-color: #ffffff;
  --bg-secondary: #f6f8fa;
  --border-color: #d0d7de;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --accent-color: #1f883d;
  --accent-hover: #1a7f37;
  --input-bg: #ffffff;
  --header-bg: #f6f8fa;
  --shadow: 0 4px 12px rgba(27, 31, 35, 0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-container img {
  width: 32px;
  height: 32px;
  color: var(--accent-color);
}

.app-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.controls {
  display: flex;
  gap: 1rem;
  align-items: center;
}

button.icon-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

button.icon-btn:hover {
  background: var(--bg-secondary);
}

/* Layout */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
nav {
  width: 260px;
  border-right: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  display: flex;
  flex-direction: column;
}

.nav-tabs {
  padding: 1rem 0;
}

.nav-tab {
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-left: 3px solid transparent;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.nav-tab:hover {
  background-color: var(--bg-color);
  color: var(--text-primary);
}

.nav-tab.active {
  background-color: var(--bg-color);
  color: var(--text-primary);
  border-left-color: var(--tab-active);
}

.history-section {
  flex: 1;
  overflow-y: auto;
  border-top: 1px solid var(--border-color);
  padding: 1rem;
}

.history-section h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.history-list {
  list-style: none;
}

.history-item {
  padding: 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
  border: 1px solid transparent;
}

.history-item:hover {
  background-color: var(--bg-color);
  border-color: var(--border-color);
}

.history-item .method {
  font-weight: bold;
  font-size: 0.7rem;
}

.history-item .url {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-secondary);
}

/* Content Area */
.content-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 1.5rem;
  gap: 1.5rem;
}

.section-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.25rem;
}

.input-group {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

select, input, textarea {
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  outline: none;
}

select:focus, input:focus, textarea:focus {
  border-color: #1f6feb;
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.3);
}

.url-input {
  flex: 1;
}

.btn-primary {
  background-color: var(--accent-color);
  color: white;
  border: 1px solid rgba(240, 246, 252, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
}

.btn-secondary:hover {
  background-color: var(--bg-color);
}

/* Dynamic Rows (Headers/Params) */
.dynamic-rows {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.dynamic-row {
  display: flex;
  gap: 0.5rem;
}

.dynamic-row input {
  flex: 1;
}

/* Tabs inside sections */
.inner-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

.inner-tab {
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
}

.inner-tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--tab-active);
}

/* Response Area */
.response-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.status-badge {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status-success { background-color: rgba(35, 134, 54, 0.2); color: #3fb950; }
.status-error { background-color: rgba(248, 81, 73, 0.2); color: #f85149; }

.response-body {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  min-height: 200px;
  max-height: 500px;
  overflow-y: auto;
}

/* Syntax Highlighting */
.json-key { color: #79c0ff; }
.json-string { color: #a5d6ff; }
.json-number { color: #d2a8ff; }
.json-boolean { color: #ffab70; }
.json-null { color: #ffab70; }

/* WebSocket Log */
.ws-log {
  height: 300px;
  overflow-y: auto;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ws-msg {
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  max-width: 80%;
}

.ws-msg.sent {
  align-self: flex-end;
  background-color: rgba(31, 111, 235, 0.2);
  border: 1px solid #1f6feb;
}

.ws-msg.received {
  align-self: flex-start;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

.ws-msg.system {
  align-self: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Footer */
footer {
  background-color: var(--header-bg);
  border-top: 1px solid var(--border-color);
  padding: 0.5rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

footer strong {
  color: var(--text-primary);
}

/* Utilities */
.help-box {
  background-color: rgba(35, 134, 54, 0.1);
  border-left: 4px solid var(--accent-color);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.help-box code {
  background-color: var(--bg-color);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-family: monospace;
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.delete-history-item {
  opacity: 0;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px;
  transition: opacity 0.2s, color 0.2s;
}

.history-item:hover .delete-history-item {
  opacity: 1;
}

.delete-history-item:hover {
  color: var(--tab-active);
}

.hidden {
  display: none !important;
}