:root {
  --font-body: "Palatino Linotype", "Book Antiqua", Palatino, serif;
  --font-display: "Optima", "Gill Sans", "Trebuchet MS", sans-serif;
  --font-mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --font-letter-tight: 0.02em;
  --font-letter-wide: 0.05em;
  --font-letter-wider: 0.08em;
  --breakpoint-md: 720px;
  --hub-max-height-multiplier: 0.75;
  --hub-form-column: calc(var(--container-max-width, 1200px) / 6);
  --hub-activity-line-padding: var(--gap-sm);
  --page-glow-a: rgba(79, 193, 217, 0.12);
  --page-glow-b: rgba(59, 177, 116, 0.1);
  --page-sheen: rgba(255, 255, 255, 0.04);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--fg);
  background:
    radial-gradient(900px 520px at 12% -8%, var(--page-glow-a), transparent 60%),
    radial-gradient(800px 500px at 88% 6%, var(--page-glow-b), transparent 58%),
    linear-gradient(155deg, var(--bg) 0%, var(--bg-alt) 52%, var(--bg-accent) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    120deg,
    rgba(255, 255, 255, 0.03) 0,
    rgba(255, 255, 255, 0.03) 1px,
    transparent 1px,
    transparent 12px
  );
  opacity: 0.15;
  pointer-events: none;
  z-index: -1;
}

.page {
  width: 100%;
  margin: 0;
  padding: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-size: 0.7rem;
  color: var(--accent);
}

.app-header h1 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.3rem);
  letter-spacing: 0.04em;
}

.subtitle {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 1.05rem;
}

.app {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(280px, 530px) minmax(0, 1fr);
  grid-template-rows: 1fr;
  align-items: stretch;
  flex: 1;
  min-height: 0;
  width: 100%;
}

.panel {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), transparent 55%), var(--card);
  border: var(--border-width) var(--border-style) var(--border);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-md);
  padding: var(--card-padding);
}

.panel-hubs {
  font-family: var(--font-display);
  align-self: start;
}

.panel-console {
  display: flex;
  flex-direction: column;
  min-height: 0;
  align-self: stretch;
}

.panel-console > .panel-header,
.panel-console > .message-form {
  flex: 0 0 auto;
}

.panel-header h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.panel-header p {
  margin: 0 0 18px;
  color: var(--muted);
}

.hub-mount {
  display: block;
}

.message-form {
  display: grid;
  gap: var(--gap-xl);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  margin-bottom: var(--margin-lg);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.field-full {
  grid-column: 1 / -1;
}

label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

select,
textarea {
  border-radius: var(--input-radius);
  border: var(--border-width) var(--border-style) var(--border);
  padding: var(--input-padding);
  background: var(--chip);
  color: var(--fg);
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: border-color var(--transition-fast) var(--transition-ease),
    box-shadow var(--transition-fast) var(--transition-ease);
}

input[type="text"] {
  border-radius: var(--input-radius);
  border: var(--border-width) var(--border-style) var(--border);
  padding: var(--input-padding);
  background: var(--chip);
  color: var(--fg);
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: border-color var(--transition-fast) var(--transition-ease),
    box-shadow var(--transition-fast) var(--transition-ease);
}

textarea {
  min-height: 150px;
  resize: vertical;
  font-family: var(--font-mono);
}

select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(79, 193, 217, 0.4);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(79, 193, 217, 0.4);
}

.field-hint {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  flex-wrap: wrap;
}

.channel-builder {
  margin-bottom: var(--margin-lg);
  padding: var(--padding-lg);
  border-radius: var(--radius-lg);
  border: var(--border-width) var(--border-style) var(--border);
  background: var(--bg-accent);
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

.channel-toggle {
  border: none;
  background: transparent;
  color: var(--fg);
  font-family: var(--font-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
  cursor: pointer;
}

.channel-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.toggle-icon {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--muted);
}

.channel-panel {
  display: flex;
  flex-direction: column;
  gap: var(--gap-lg);
}

.channel-builder.is-collapsed .channel-panel {
  display: none;
}

.channel-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.channel-form {
  display: grid;
  gap: var(--gap-lg);
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.channel-id-row {
  display: flex;
  gap: var(--gap-md);
  align-items: center;
}

.channel-id-row input {
  flex: 1;
}

.button-ghost {
  border: var(--border-width) var(--border-style) var(--border);
  background: transparent;
  color: var(--fg);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: filter var(--transition-fast) var(--transition-ease),
    transform var(--transition-fast) var(--transition-ease);
}

.button-ghost:hover {
  filter: brightness(var(--hover-brightness));
  transform: translateY(calc(-1 * var(--button-active-shift)));
}

.button-outline {
  border: var(--border-width) var(--border-style) var(--accent);
  background: transparent;
  color: var(--accent);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: filter var(--transition-fast) var(--transition-ease),
    transform var(--transition-fast) var(--transition-ease);
}

.button-outline:hover {
  filter: brightness(var(--hover-brightness));
  transform: translateY(calc(-1 * var(--button-active-shift)));
}

.button-send {
  border: none;
  background: linear-gradient(135deg, rgba(79, 193, 217, 0.85), var(--accent));
  color: var(--bg);
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-family: var(--font-display);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  transition: transform var(--transition-fast) var(--transition-ease),
    filter var(--transition-fast) var(--transition-ease),
    box-shadow var(--transition-normal) var(--transition-ease);
}

.button-send:hover {
  filter: brightness(var(--hover-brightness));
  transform: translateY(calc(-1 * var(--button-active-shift)));
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.4);
}

.button-send:active {
  transform: translateY(0);
}

.hint {
  font-size: 0.82rem;
  color: var(--muted);
}

.log-panel {
  border-top: 1px dashed var(--border);
  padding-top: var(--padding-lg);
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  flex: 1;
  min-height: 0;
  width: 100%;
}

.log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--gap-lg);
}

.log-header h3 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

.log-legend {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.log-controls {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  flex-wrap: wrap;
}

.button-clear {
  border: var(--border-width) var(--border-style) var(--border);
  background: var(--chip);
  color: var(--fg);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: filter var(--transition-fast) var(--transition-ease),
    transform var(--transition-fast) var(--transition-ease);
}

.button-clear:hover {
  filter: brightness(var(--hover-brightness));
  transform: translateY(calc(-1 * var(--button-active-shift)));
}

.message-log {
  background: var(--bg-highlight);
  border-radius: var(--radius-lg);
  border: var(--border-width) var(--border-style) var(--border);
  padding: var(--padding-md);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  width: 100%;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  line-height: 1.5;
}

.log-line {
  display: grid;
  grid-template-columns: 78px auto;
  gap: var(--gap-md);
  padding: 6px 0;
  border-bottom: 1px dotted rgba(255, 255, 255, 0.08);
}

.log-line:last-child {
  border-bottom: none;
}

.log-time {
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.log-body {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.log-text {
  white-space: pre-wrap;
  word-break: break-word;
}

.log-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
  flex-wrap: wrap;
}

.log-destination {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.log-payload {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
}

.log-copy {
  border: var(--border-width) var(--border-style) var(--border);
  background: transparent;
  color: var(--fg);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: filter var(--transition-fast) var(--transition-ease),
    transform var(--transition-fast) var(--transition-ease);
}

.log-copy:hover {
  filter: brightness(var(--hover-brightness));
  transform: translateY(calc(-1 * var(--button-active-shift)));
}

.log-copy:disabled {
  opacity: 0.6;
  cursor: default;
}

.log-line--outbound .log-payload {
  color: var(--accent);
}

.log-line--inbound .log-payload {
  color: var(--ok);
}

.log-line--system .log-text {
  color: var(--muted);
}

.log-line--error .log-text {
  color: var(--err);
}

.log-line--error .log-payload {
  color: var(--err);
}

@media (max-width: 920px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
}

@media (max-width: 600px) {
  .page {
    padding: 12px;
  }

  .log-line {
    grid-template-columns: 1fr;
  }
}