/* ===== CSS Variables ===== */
:root {
  --transition: 0.25s ease;
}

/* --- Dark Theme --- */
body.theme-dark {
  --bg:        #121212;
  --bg-card:   #1e1e1e;
  --bg-input:  #2a2a2a;
  --border:    #333;
  --text:      #e0e0e0;
  --text-muted:#888;
  --primary:   #4f9cf9;
  --primary-h: #3a82e4;
  --danger:    #e05252;
  --danger-h:  #c43c3c;
  --secondary: #3a3a3a;
  --secondary-h:#4a4a4a;
  --terminal-bg:#0d0d0d;
  --terminal-tx:#39ff14;
  --badge-ok:  #39ff14;
  --badge-err: #e05252;
  --topbar-bg: #1a1a1a;
  --scrollbar: #333;
}

/* --- Light Theme --- */
body.theme-light {
  --bg:        #f0f2f5;
  --bg-card:   #ffffff;
  --bg-input:  #f5f5f5;
  --border:    #d0d0d0;
  --text:      #1a1a1a;
  --text-muted:#666;
  --primary:   #1a73e8;
  --primary-h: #1558b0;
  --danger:    #d93025;
  --danger-h:  #b7231a;
  --secondary: #e0e0e0;
  --secondary-h:#c8c8c8;
  --terminal-bg:#1e1e1e;
  --terminal-tx:#c8ffc8;
  --badge-ok:  #1a9e1a;
  --badge-err: #d93025;
  --topbar-bg: #ffffff;
  --scrollbar: #bbb;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ===== Topbar ===== */
.topbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.55rem 1.25rem;
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background var(--transition), border-color var(--transition);
}

.app-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--primary);
  white-space: nowrap;
}

.topbar-divider {
  width: 1px;
  height: 1.3em;
  background: var(--border);
  margin: 0 0.15rem;
  flex-shrink: 0;
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.meta-item {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.meta-item strong {
  color: var(--text);
  font-weight: 600;
  font-family: 'Cascadia Code', 'Consolas', monospace;
}

.flex-spacer { flex: 1; min-width: 0.5rem; }

/* ===== Container ===== */
.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ===== Card ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: background var(--transition), border-color var(--transition);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== Form Grid ===== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

select,
input[type="number"],
input[type="text"] {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.65rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
  width: 100%;
}

select:focus,
input[type="number"]:focus,
input[type="text"]:focus {
  border-color: var(--primary);
}

.port-row {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.port-row select { flex: 1; }

/* ===== Buttons ===== */
.btn {
  padding: 0.5rem 1.1rem;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition);
}

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

.btn-primary  { background: var(--primary);   color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-h); }

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

.btn-secondary{ background: var(--secondary); color: var(--text); }
.btn-secondary:hover:not(:disabled){ background: var(--secondary-h); }

.btn-sm  { padding: 0.35rem 0.6rem; font-size: 0.85rem; }

.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.1rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  line-height: 1;
}
.btn-icon:hover { background: var(--secondary); }

/* ===== Button Row ===== */
.btn-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ===== Status Badge ===== */
.status-badge {
  font-size: 0.85rem;
  color: var(--badge-err);
  font-weight: 500;
}
.status-badge.connected { color: var(--badge-ok); }

/* ===== Terminal ===== */
.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.terminal-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.terminal-output {
  background: var(--terminal-bg);
  color: var(--terminal-tx);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  height: 320px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  transition: background var(--transition), border-color var(--transition);
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar) transparent;
}

.terminal-output .line-tx { color: #9ec8ff; }
.terminal-output .line-rx { color: var(--terminal-tx); }
.terminal-output .line-info { color: var(--text-muted); font-style: italic; }
.terminal-output .line-err { color: var(--badge-err); }

.terminal-input-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.terminal-input-row input { flex: 1; }

/* ===== Device Info ===== */
.device-info-grid {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.device-info-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  flex: 1;
  min-width: 140px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  transition: background var(--transition), border-color var(--transition);
}

.device-info-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.device-info-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

.device-info-value.mono {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.9rem;
  word-break: break-all;
}

/* ===== Measurements ===== */
.measurements-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 600px) {
  .measurements-grid { grid-template-columns: repeat(2, 1fr); }
}

.meas-item {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  transition: background var(--transition), border-color var(--transition);
}

.meas-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meas-unit {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.meas-value {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--primary);
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  line-height: 1.1;
}

.meas-raw {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  margin-top: 0.2rem;
}