:root {
  --bg-main: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-terminal: #050811;
  --border-color: #1e293b;
  --border-focus: #0284c7;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-glow: rgba(2, 132, 199, 0.25);
  
  --accent-cyan: #38bdf8;
  --accent-emerald: #34d399;
  --accent-amber: #fbbf24;
  --accent-rose: #f43f5e;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, "Courier New", monospace;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* App Header */
.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  z-index: 20;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.brand-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: #fff;
}

.brand-tag {
  font-size: 10px;
  background: rgba(2, 132, 199, 0.2);
  color: var(--accent-cyan);
  border: 1px solid rgba(2, 132, 199, 0.4);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
}

/* App Nav Tabs */
.app-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-tab {
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-muted);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-tab:hover {
  color: #fff;
  background: var(--bg-surface-elevated);
}

.nav-tab.active {
  color: #fff;
  background: var(--primary);
}

.nav-tab .badge-coming {
  font-size: 9px;
  background: #334155;
  color: #cbd5e1;
  padding: 1px 4px;
  border-radius: 3px;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.link-back-site {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s;
}

.link-back-site:hover {
  color: var(--accent-cyan);
}

/* Compatibility Alert Banner */
.compat-banner {
  background: #451a03;
  color: #fde68a;
  border-bottom: 1px solid #78350f;
  padding: 8px 16px;
  font-size: 12px;
  display: none;
  text-align: center;
}

/* Control Toolbar */
.control-toolbar {
  background: #0b1120;
  border-bottom: 1px solid var(--border-color);
  padding: 10px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Connection Status Indicator */
.connection-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 12px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: all 0.3s;
}

.status-dot.connected {
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.status-dot.disconnected {
  background: var(--accent-rose);
}

.status-info {
  display: flex;
  flex-direction: column;
}

.status-info strong {
  font-size: 11px;
  line-height: 1.2;
}

.status-info small {
  font-size: 10px;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  box-shadow: 0 0 12px var(--primary-glow);
}

.btn-danger {
  background: #dc2626;
  color: #fff;
}
.btn-danger:hover:not(:disabled) {
  background: #b91c1c;
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover:not(:disabled) {
  background: #334155;
  color: #fff;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Select and Inputs */
.select-input, .text-input {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  outline: none;
  transition: border-color 0.2s;
}

.select-input:focus, .text-input:focus {
  border-color: var(--border-focus);
}

/* Main Studio Layout */
.app-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 340px;
  overflow: hidden;
}

/* Terminal Column */
.terminal-column {
  display: flex;
  flex-direction: column;
  background: var(--bg-terminal);
  border-right: 1px solid var(--border-color);
  overflow: hidden;
}

.terminal-options-bar {
  padding: 6px 14px;
  background: #0d1527;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input {
  cursor: pointer;
}

.terminal-viewport {
  flex: 1;
  padding: 14px 16px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
}

/* Terminal Rows */
.log-row {
  margin-bottom: 3px;
  word-break: break-all;
  white-space: pre-wrap;
}

.log-ts {
  color: var(--text-dim);
  font-size: 11px;
}

.log-tag {
  display: inline-block;
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 10px;
  font-weight: 700;
  margin-right: 6px;
}

.log-tag.log-rx {
  background: rgba(52, 211, 153, 0.15);
  color: var(--accent-emerald);
}

.log-tag.log-tx {
  background: rgba(251, 191, 36, 0.15);
  color: var(--accent-amber);
}

.log-tag.log-系統 {
  background: rgba(2, 132, 199, 0.15);
  color: var(--accent-cyan);
}

.log-tag.log-錯誤 {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
}

.rx-msg .log-msg { color: #6ee7b7; }
.tx-msg .log-msg { color: #fde68a; font-weight: 600; }
.sys-info .log-msg { color: #94a3b8; }
.sys-success .log-msg { color: #38bdf8; }
.sys-warn .log-msg { color: #fde047; }
.sys-err .log-msg { color: #fb7185; }

/* Terminal Input Bar */
.terminal-input-bar {
  padding: 10px 14px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cmd-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 13px;
}

/* Sidebar Column (Macros & Servo Tools) */
.sidebar-column {
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
}

.panel-header {
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Macro Buttons Grid */
.macro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.btn-macro {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 10px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
}

.btn-macro:hover {
  background: #27354a;
  border-color: #3b82f6;
}

.btn-macro .macro-name {
  font-size: 12px;
  font-weight: 600;
}

.btn-macro .macro-cmd {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent-cyan);
  background: rgba(2, 132, 199, 0.15);
  padding: 2px 5px;
  border-radius: 3px;
}

/* Custom Macro Item */
.custom-macro-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-macro-del {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
}

.btn-macro-del:hover {
  color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.1);
}

.empty-note {
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
  padding: 8px;
}

/* Servo Calibrator Section */
.servo-ctrl-box {
  background: #0b1120;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.servo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-container input[type="range"] {
  flex: 1;
  accent-color: var(--primary);
}

.angle-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-cyan);
  min-width: 40px;
  text-align: right;
}

/* Form Add Macro */
.form-add-macro {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 10px;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-surface);
}
::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

/* Responsive adjustments */
@media (max-width: 860px) {
  .app-body {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 280px;
  }
  .terminal-column {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}