:root {
  --bg: #0f1115;
  --panel: #161a21;
  --panel-border: #262b35;
  --text: #e6e9ef;
  --text-dim: #8a93a3;
  --accent: #3ddc97;
  --accent-dim: #2a9d6f;
  --danger: #ef5a5a;
  --danger-dim: #b84343;
  --terminal-bg: #0a0c10;
  --terminal-text: #3ddc97;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--panel-border);
}

.app-header h1 {
  font-size: 1.15rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.app-header .icon {
  font-size: 1.25rem;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--text-dim);
}

.status-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 90, 90, 0.15);
}

.status--connected .status-dot {
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.18);
}

.status--connected #status-text {
  color: var(--accent);
}

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

.controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.controls-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

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

.btn {
  font: inherit;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.btn:hover:not(:disabled) {
  border-color: var(--text-dim);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: #06110c;
  font-weight: 600;
}

.btn--primary:hover:not(:disabled) {
  background: var(--accent);
  border-color: var(--accent);
}

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

.btn--danger:hover:not(:disabled) {
  background: rgba(239, 90, 90, 0.1);
}

.btn--ghost {
  background: transparent;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}

.checkbox input {
  accent-color: var(--accent);
}

.terminal-wrap {
  flex: 1;
  min-height: 260px;
  display: flex;
}

.terminal {
  flex: 1;
  background: var(--terminal-bg);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 260px;
  max-height: 55vh;
}

.terminal .line {
  display: block;
}

.terminal .line--rx {
  color: var(--terminal-text);
}

.terminal .line--tx {
  color: #7fb0ff;
}

.terminal .line--tx::before {
  content: "» ";
  opacity: 0.7;
}

.terminal .line--sys {
  color: var(--text-dim);
  font-style: italic;
}

.terminal .ts {
  color: var(--text-dim);
  margin-right: 0.5rem;
  font-size: 0.78rem;
}

.send-form {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.send-form input[type="text"] {
  flex: 1;
  font: inherit;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  color: var(--text);
}

.send-form input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-dim);
}

.send-form input:disabled {
  opacity: 0.5;
}

.newline-toggle {
  white-space: nowrap;
}

.support-warning {
  background: rgba(239, 90, 90, 0.1);
  border: 1px solid var(--danger-dim);
  color: var(--danger);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
}

.app-footer {
  padding: 1rem 1.25rem 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
}

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

.app-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 520px) {
  .app-header {
    padding: 0.85rem 1rem;
  }

  .app-main {
    padding: 0.85rem 1rem;
  }

  .controls-right {
    margin-left: 0;
  }
}