:root {
  color-scheme: dark;
  --bg-gradient: radial-gradient(circle at top, #172554, #0f172a 55%, #020617 100%);
  --terminal-bg: rgba(15, 23, 42, 0.88);
  --terminal-border: rgba(148, 163, 184, 0.2);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #38bdf8;
  --prompt: #34d399;
  font-size: clamp(14px, 1.8vw, 16px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Fira Code", "Cascadia Code", "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", monospace;
  background: var(--bg-gradient) fixed;
  color: var(--text-primary);
  min-height: 100vh;
}

.background {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.5rem, 4vw, 3rem);
}

.viewport {
  width: min(1180px, 100%);
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: clamp(1.5rem, 4vw, 3rem);
  transition: max-width 200ms ease, gap 200ms ease;
}

.viewport.panel-hidden {
  justify-content: center;
}

.viewport.panel-hidden .visitor-panel {
  display: none;
}

.viewport.panel-hidden .terminal-app {
  margin-inline: auto;
}

.terminal-app {
  flex: 1 1 0;
  max-width: 720px;
  background: var(--terminal-bg);
  border: 1px solid var(--terminal-border);
  border-radius: 12px;
  box-shadow: 0 30px 90px rgba(2, 6, 23, 0.55);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.terminal-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--terminal-border);
  background: rgba(15, 23, 42, 0.75);
}

.terminal-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.terminal-icon {
  width: 22px;
  height: 22px;
  color: var(--accent);
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.35));
}

.terminal-title {
  font-weight: 600;
  letter-spacing: 0.08em;
}

.tab-bar {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: thin;
}

.tab {
  display: flex;
  align-items: center;
  background: rgba(30, 41, 59, 0.65);
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--text-secondary);
  transition: color 150ms ease, background 150ms ease, border-color 150ms ease;
}

.tab.active {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.4);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.2);
}

.tab-trigger {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.5rem 0.4rem 0.75rem;
  border: none;
  background: transparent;
  color: inherit;
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
}

.tab:hover .tab-trigger {
  color: var(--text-primary);
}

.tab.active .tab-trigger {
  color: var(--accent);
}

.tab-icon {
  display: inline-flex;
  width: 1rem;
  justify-content: center;
  font-weight: 600;
  transform: translateY(-1px);
}

.tab-label {
  white-space: nowrap;
}

.tab-close {
  border: none;
  background: transparent;
  color: inherit;
  font-size: 0.95rem;
  padding: 0.4rem 0.75rem 0.4rem 0.4rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 150ms ease;
}

.tab-close:hover,
.tab-close:focus-visible {
  color: var(--accent);
}

.add-tab {
  appearance: none;
  border: 1px solid var(--terminal-border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  cursor: pointer;
  transition: color 150ms ease, border-color 150ms ease, background 150ms ease;
}

.add-tab:hover {
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(56, 189, 248, 0.12);
}

.visitor-panel {
  flex: 0 0 clamp(260px, 30vw, 340px);
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--terminal-border);
  border-radius: 12px;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--text-primary);
  display: flex;
  align-self: stretch;
  box-shadow: 0 25px 70px rgba(2, 6, 23, 0.45);
}

.visitor-panel.hidden {
  display: none;
}

.visitor-card {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
}

.visitor-heading {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.visitor-intro {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

#visitor-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  flex: 1;
}

.question {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
  background: rgba(30, 41, 59, 0.35);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 10px;
  padding: 1rem;
}

.question.active {
  display: flex;
}

.question-title {
  margin: 0;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.option-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.5rem;
}

.option-group.rating {
  grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
}

.option-button {
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.65);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.6rem 0.75rem;
  cursor: pointer;
  transition: border-color 150ms ease, color 150ms ease, background 150ms ease, box-shadow 150ms ease;
}

.option-button:hover,
.option-button:focus-visible {
  color: var(--text-primary);
  border-color: rgba(56, 189, 248, 0.6);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.option-button.selected {
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.6);
  background: rgba(56, 189, 248, 0.12);
  box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.25);
}

.question textarea {
  width: 100%;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-primary);
  resize: vertical;
  min-height: 120px;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.question textarea:focus {
  border-color: rgba(56, 189, 248, 0.6);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
  outline: none;
}

.helper-text {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.question-next,
.submit-button {
  align-self: flex-end;
  border: 1px solid rgba(56, 189, 248, 0.6);
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.55rem 1.25rem;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}

.question-next[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  border-color: rgba(148, 163, 184, 0.25);
  background: transparent;
  color: var(--text-secondary);
}

.question-next:not([disabled]):hover,
.submit-button:hover,
.question-next:not([disabled]):focus-visible,
.submit-button:focus-visible {
  background: rgba(56, 189, 248, 0.3);
  color: var(--text-primary);
  border-color: rgba(56, 189, 248, 0.8);
}

.submit-button {
  margin-top: 0.25rem;
}

.terminal-body {
  display: grid;
  grid-auto-flow: row;
  position: relative;
  min-height: clamp(320px, 50vh, 560px);
}

.tab-panel {
  display: none;
  flex-direction: column;
  padding: 1rem;
}

.tab-panel.active {
  display: flex;
}

.terminal-output {
  flex: 1;
  overflow-y: auto;
  margin-bottom: 1rem;
  padding-right: 0.25rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.terminal-output::-webkit-scrollbar {
  width: 6px;
}

.terminal-output::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.25);
  border-radius: 6px;
}

.terminal-line {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 0.35rem;
}

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

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

.terminal-line .response {
  color: var(--text-secondary);
  white-space: pre-wrap;
}

.terminal-input {
  display: grid;
  grid-template-columns: min-content 1fr;
  gap: 0.75rem;
  align-items: center;
  color: var(--text-primary);
  border-top: 1px solid var(--terminal-border);
  padding-top: 0.75rem;
}

.terminal-input .prompt {
  color: var(--prompt);
  font-size: 1rem;
}

.terminal-input input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  padding: 0;
  caret-color: var(--accent);
}

.terminal-input input::placeholder {
  color: rgba(148, 163, 184, 0.45);
}

@media (max-width: 640px) {
  .terminal-header {
    grid-template-columns: auto 1fr auto;
    gap: 0.5rem;
  }

  .terminal-app {
    border-radius: 10px;
  }

  .viewport {
    flex-direction: column;
    max-width: 100%;
  }

  .terminal-app,
  .visitor-panel {
    max-width: 100%;
  }

  .visitor-panel {
    align-self: center;
  }

  .option-group {
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  }
}