:root {
  --bg-main: #0c0e15;
  --bg-radial: radial-gradient(circle at 20% 20%, #1f2235 0, transparent 35%),
    radial-gradient(circle at 80% 10%, #1b2b3f 0, transparent 28%),
    radial-gradient(circle at 50% 80%, #172026 0, transparent 32%);
  --card-bg: #121420;
  --card-border: #22243a;
  --accent: #66e3ff;
  --accent-soft: #66e3ff33;
  --text-primary: #f8fafc;
  --text-secondary: #c2c6d7;
  --text-muted: #8b90a1;
  --danger: #ff3b30;
  --success: #30d158;
  --divider: #222535;
  --input-bg: #141727;
  --input-border: #2d3145;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  background: var(--bg-main);
  background-image: var(--bg-radial);
  color: var(--text-primary);
}

body {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2.5rem 1.5rem;
}

.shell {
  width: 100%;
  max-width: 980px;
  background: linear-gradient(145deg, #121420 0%, #0f111c 100%);
  border-radius: 22px;
  border: 1px solid var(--card-border);
  box-shadow:
    0 20px 60px rgba(0,0,0,0.55),
    0 0 0 1px rgba(255,255,255,0.02);
  padding: 1.9rem 1.9rem 2.4rem;
  position: relative;
  overflow: hidden;
}

.shell::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 85% 0%, rgba(102, 227, 255, 0.08), transparent 45%);
}

.shell-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  gap: 1rem;
}

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

.logo-wrap {
  width: 192px;
  height: 192px;
  border-radius: 14px;
  background: #0f121d;
  border: 1px solid var(--card-border);
  display: grid;
  place-items: center;
  padding: 18px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.02);
}

.logo-wrap img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0;
  color: var(--text-primary);
}

.subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.firmware-meta {
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.browser-note {
  max-width: 220px;
  text-align: right;
  color: var(--text-secondary);
  font-size: 0.75rem;
  line-height: 1.3;
  background: #191c2b;
  border: 1px dashed #2c3042;
  padding: 6px 8px;
  border-radius: 10px;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: #ff9f0a;
  margin-right: 0.35rem;
}

.status-dot.connected {
  background: var(--success);
}

.status-text {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  align-items: center;
}

button {
  appearance: none;
  border-radius: 999px;
  border: 1px solid transparent;
  background: #181a27;
  color: var(--text-primary);
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    transform 0.08s ease,
    box-shadow 0.15s ease,
    color 0.15s ease;
  box-shadow: 0 0 0 transparent;
}

button span.icon {
  font-size: 0.95em;
  opacity: 0.85;
  display: flex;
  align-items: center;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent-soft);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(102, 227, 255, 0.35);
}

button.secondary {
  background: #181a27;
  border-color: #282a3c;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.55);
  background: #1e2030;
}

button.primary:hover:not(:disabled) {
  background: #53d7f1;
  color: #0a0c15;
  box-shadow: 0 14px 30px rgba(83, 215, 241, 0.55);
}

button:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 6px 15px rgba(0,0,0,0.7);
}

button:disabled {
  opacity: 0.45;
  cursor: default;
  box-shadow: none;
  transform: none;
}

.firmware-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  background: #121626;
  border: 1px solid var(--divider);
  border-radius: 14px;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
}

.firmware-pill {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  background: #162036;
  border: 1px dashed #28324a;
  padding: 0.4rem 0.7rem;
  border-radius: 12px;
}

.pill-label {
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.pill-value {
  font-weight: 600;
  color: #e5e7ff;
}

.firmware-actions {
  display: flex;
  gap: 0.5rem;
}

.firmware-section {
  margin-top: 0.75rem;
}

.content-split {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 1.2rem;
  margin-top: 0.5rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 800px) {
  .content-split {
    grid-template-columns: minmax(0, 1fr);
  }
  .shell {
    padding: 1.25rem 1.2rem 1.6rem;
  }
  .version-select-wrapper {
    width: 100%;
    justify-content: flex-start;
    margin-left: 0;
    margin-top: 0.25rem;
  }
  .button-row {
    flex-wrap: wrap;
  }
}

.panel {
  background: #121624;
  border-radius: 14px;
  border: 1px solid var(--divider);
  padding: 0.75rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.1rem;
}

.panel-header span.label {
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.panel-header span.badge {
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
  font-size: 0.7rem;
  background: #20212a;
  border: 1px solid #2f3138;
  color: var(--text-secondary);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  margin-top: 0.25rem;
}

th, td {
  border-bottom: 1px solid var(--divider);
  padding: 0.4rem 0.35rem;
}

thead th {
  background: #171821;
  color: var(--text-secondary);
  font-weight: 500;
  text-align: left;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

tbody tr:last-child td {
  border-bottom: none;
}

input[type="text"], select.config-value {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-primary);
  padding: 0.32rem 0.5rem;
  font-size: 0.86rem;
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

input[readonly] {
  background: #14151c;
  color: var(--text-secondary);
  border-style: dashed;
}

input[type="text"]:focus,
select.config-value:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
  background: #1b1c25;
}

select.config-value {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%),
    linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%);
  background-position:
    calc(100% - 12px) calc(50% - 3px),
    calc(100% - 7px)  calc(50% - 3px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 1.5rem;
}

pre {
  border-radius: 10px;
  border: 1px solid var(--divider);
  padding: 0.55rem 0.65rem;
  max-height: 260px;
  overflow: auto;
  white-space: pre-wrap;
  font-family: ui-monospace, Menlo, SFMono-Regular, Consolas, "Roboto Mono", monospace;
  font-size: 0.78rem;
  background: #0b0d16;
  color: var(--text-secondary);
}

.log-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.log-label-row .hint {
  color: var(--text-muted);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  background: rgba(20, 122, 255, 0.96);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 500;
  box-shadow: 0 12px 30px rgba(0,0,0,0.55);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.18s ease-out,
    transform 0.18s ease-out;
  z-index: 50;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
  transition: opacity 0.15s ease, visibility 0.15s ease;
}

.modal.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(2px);
}

.modal-content {
  position: relative;
  background: #161722;
  border: 1px solid var(--divider);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  width: min(440px, 92vw);
  box-shadow: 0 20px 60px rgba(0,0,0,0.55);
  z-index: 1;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.modal-title {
  font-size: 1rem;
  font-weight: 600;
}

.modal-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.modal-body {
  margin: 0.8rem 0 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.modal-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.modal-body select {
  border-radius: 10px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-primary);
  padding: 0.4rem 0.6rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.modal-body select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.current-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.65rem;
  border-radius: 10px;
  background: #1c1e2a;
  border: 1px solid #242735;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.icon-button {
  background: #1f2030;
  border: 1px solid #2b2d3a;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--text-primary);
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 0.9rem;
}

.icon-button:hover {
  background: #2a2c3c;
}