src/styles.css

:root {
  color-scheme: light;
  --paper: #f7f7f4;
  --panel: #ffffff;
  --ink: #171a1f;
  --muted: #626a73;
  --line: #d9ded8;
  --field: #f1f3f0;
  --copper: #b85f37;
  --signal: #1d7f6e;
  --violet: #4f46a7;
  --shadow: 0 24px 80px rgba(23, 26, 31, 0.14);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    linear-gradient(90deg, rgba(23, 26, 31, 0.035) 1px, transparent 1px) 0 0 / 42px 42px,
    linear-gradient(rgba(23, 26, 31, 0.035) 1px, transparent 1px) 0 0 / 42px 42px,
    var(--paper);
  color: var(--ink);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

.shell {
  width: min(1420px, calc(100vw - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 28px 0;
  display: grid;
  align-items: center;
}

.console {
  min-height: min(860px, calc(100vh - 56px));
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.topbar,
.output-header,
.actions,
.preset-row {
  display: flex;
  align-items: center;
}

.topbar {
  justify-content: space-between;
  gap: 16px;
  padding: 4px 4px 18px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  font-size: clamp(2.2rem, 5vw, 5.4rem);
  line-height: 0.92;
  font-weight: 680;
}

h2 {
  font-size: 1.05rem;
  line-height: 1.1;
}

.runtime {
  min-height: 40px;
  max-width: 520px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  background: var(--panel);
  font-size: 0.82rem;
  line-height: 1.2;
}

.runtime-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--muted);
}

.runtime-ready .runtime-dot {
  background: var(--signal);
}

.runtime-error .runtime-dot {
  background: var(--copper);
}

.workbench {
  display: grid;
  grid-template-columns: minmax(340px, 0.78fr) minmax(420px, 1.22fr);
  gap: 18px;
  padding-top: 18px;
}

.controls,
.output-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.controls {
  padding: 16px;
}

.field {
  display: grid;
  gap: 7px;
}

.field span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 720;
  text-transform: uppercase;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--field);
  color: var(--ink);
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 82px;
  padding: 11px 12px;
  line-height: 1.42;
}

textarea:focus,
input:focus,
select:focus,
button:focus-visible,
.output:focus {
  border-color: var(--violet);
  box-shadow: 0 0 0 3px rgba(79, 70, 167, 0.16);
}

.prompt-field {
  margin-top: 12px;
}

.preset-row {
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}

.preset,
.secondary,
.primary {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 13px;
  color: var(--ink);
  background: var(--panel);
  font-weight: 720;
}

.preset:hover,
.secondary:hover {
  border-color: var(--muted);
}

.setting-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

input,
select {
  height: 38px;
  padding: 0 10px;
}

.actions {
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

.primary {
  min-width: 132px;
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.primary:hover {
  background: #000;
}

.output-panel {
  position: relative;
  display: grid;
  grid-template-rows: auto auto minmax(360px, 1fr) auto;
  overflow: hidden;
}

.output-header {
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
}

.metric {
  min-width: 96px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--muted);
  text-align: center;
  font-size: 0.82rem;
  font-weight: 720;
}

.progress-shell {
  height: 3px;
  background: var(--field);
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--signal), var(--violet), var(--copper));
  transition: width 180ms ease;
}

.output {
  margin: 0;
  padding: 20px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  outline: none;
  color: var(--ink);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.96rem;
  line-height: 1.55;
}

.output:empty::before {
  color: var(--muted);
  content: "Model output will appear here.";
}

.token-rail {
  min-height: 34px;
  padding: 8px 12px 12px;
  display: flex;
  align-items: flex-end;
  gap: 4px;
  border-top: 1px solid var(--line);
  background: #fbfbfa;
}

.token-mark {
  width: var(--token-size);
  height: 9px;
  border-radius: 999px;
  background: var(--signal);
  opacity: 0.42;
  animation: token-rise 360ms ease-out both;
}

.token-mark:nth-child(3n) {
  background: var(--violet);
}

.token-mark:nth-child(5n) {
  background: var(--copper);
}

@keyframes token-rise {
  from {
    transform: translateY(7px);
    opacity: 0;
  }
}

@media (max-width: 980px) {
  .shell {
    width: min(100vw - 20px, 760px);
    align-items: start;
    padding: 10px 0;
  }

  .console {
    min-height: calc(100vh - 20px);
    padding: 12px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .runtime {
    width: 100%;
    max-width: none;
    border-radius: 6px;
  }

  .workbench {
    grid-template-columns: 1fr;
  }

  .setting-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .output-panel {
    grid-template-rows: auto auto minmax(280px, 48vh) auto;
  }
}

@media (max-width: 560px) {
  .shell {
    width: 100%;
    padding: 0;
  }

  .console {
    min-height: 100vh;
    border: 0;
    border-radius: 0;
  }

  .setting-grid {
    grid-template-columns: 1fr;
  }

  .actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary,
  .secondary {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

.diagnostics-panel {
  border-top: 1px solid var(--line);
  background: #fbfbfa;
}

.diagnostics-header {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.diagnostics-header h2 {
  font-size: 0.95rem;
}

.diagnostics {
  max-height: 220px;
  margin: 0;
  padding: 0 14px 14px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: #2c3238;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.45;
}

.diagnostics:empty::before {
  color: var(--muted);
  content: "Diagnostics will appear here.";
}