/* =========================================================================
   NYU Archway - example app design system.

   A standalone reproduction of the gateway's own stylesheet, carried by each
   demo so a clone is one `git clone` away from running: no build step, no
   package manager, no CDN. Tokens are copied from
   gateway/src/nyugw/static/css/app.css; if that file's palette moves, this is
   the file to re-sync.

   NYU violet (#57068c) is the accent - the one primary action, the active
   control, the focus ring. It is deliberately NOT a data colour: a hue that
   means both "NYU" and "the Anthropic series" is misread every time. Provider
   comparisons use --series-*.

   Dark mode answers both the OS preference and an explicit [data-theme], which
   must win either way.

   Section map
     1. Tokens
     2. Reset & base
     3. Layout shell & topbar
     4. Cards & grids
     5. Buttons
     6. Forms
     7. Key panel
     8. Badges, readout, meters
     9. Messages, alerts, empty states
    10. Motion & utility
    11. Responsive
   ========================================================================= */

/* ------------------------------------------------------------- 1. Tokens */

:root {
  color-scheme: light;

  --nyu-violet: #57068c;
  --accent: #57068c;
  --accent-strong: #440470;
  --accent-soft: #f4edfa;
  --accent-border: #ddc9ec;
  --accent-ink: #ffffff;
  --accent-glow: rgba(87, 6, 140, 0.16);

  --plane: #f7f6f3;
  --plane-2: #efeee9;
  --surface-1: #ffffff;
  --surface-2: #f4f3ef;
  --surface-3: #e9e8e1;
  --overlay: rgba(11, 11, 11, 0.42);

  --ink-1: #0f0f0e;
  --ink-2: #55544f;
  --ink-3: #8b8a84;
  --ink-invert: #ffffff;

  --border: rgba(11, 11, 11, 0.10);
  --border-strong: rgba(11, 11, 11, 0.18);
  --track: #eceae4;

  --good: #0ca30c;
  --good-soft: #e6f6e6;
  --good-ink: #0a6b0a;
  --warning: #e0a01a;
  --warning-soft: #fdf4e0;
  --warning-ink: #8a5c00;
  --critical: #d03b3b;
  --critical-soft: #fceaea;
  --critical-ink: #a72222;

  /* Fixed order, never cycled - a provider keeps its colour across every app. */
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --series-4: #eda100;
  --series-5: #e87ba4;
  --series-6: #008300;
  --series-other: #8b8a84;

  --meter-ok: #2a78d6;
  --meter-ok-track: #dce9fa;
  --meter-warn: #e09000;
  --meter-warn-track: #f9ecce;
  --meter-over: #d03b3b;
  --meter-over-track: #f6dede;

  --focus: #57068c;

  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;

  --r-xs: 4px;
  --r-sm: 7px;
  --r-md: 11px;
  --r-lg: 16px;
  --r-xl: 22px;
  --r-full: 999px;

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --fs-xs: 0.6875rem;
  --fs-sm: 0.8125rem;
  --fs-base: 0.9375rem;
  --fs-md: 1.0625rem;
  --fs-lg: 1.3125rem;
  --fs-xl: 1.75rem;
  --fs-hero: 2.25rem;

  /* Two-part shadows: a tight contact shadow plus a soft ambient one. A single
     large blur reads as a sticker; the pair reads as a surface. */
  --shadow-1: 0 1px 2px rgba(11, 11, 11, 0.05), 0 1px 1px rgba(11, 11, 11, 0.03);
  --shadow-2: 0 1px 2px rgba(11, 11, 11, 0.05), 0 6px 18px -6px rgba(11, 11, 11, 0.10);
  --shadow-3: 0 2px 4px rgba(11, 11, 11, 0.06), 0 22px 48px -12px rgba(11, 11, 11, 0.20);

  --ring: 0 0 0 3px var(--accent-glow);

  --maxw: 74rem;
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;

    --accent: #bf93e2;
    --accent-strong: #d3b2ee;
    --accent-soft: #241033;
    --accent-border: #4d2c6a;
    --accent-ink: #1a0a26;
    --accent-glow: rgba(191, 147, 226, 0.22);

    --plane: #0c0c0d;
    --plane-2: #121213;
    --surface-1: #19191a;
    --surface-2: #222223;
    --surface-3: #2c2c2d;
    --overlay: rgba(0, 0, 0, 0.66);

    --ink-1: #f7f7f5;
    --ink-2: #b9b8b2;
    --ink-3: #86857f;
    --ink-invert: #0b0b0b;

    --border: rgba(255, 255, 255, 0.10);
    --border-strong: rgba(255, 255, 255, 0.20);
    --track: #222223;

    --good-soft: #0e2a0e;
    --good-ink: #5fd15f;
    --warning-soft: #33280a;
    --warning-ink: #f0bb4a;
    --critical-soft: #331616;
    --critical-ink: #ef9a9a;

    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --series-4: #c98500;
    --series-5: #d55181;
    --series-6: #17a217;

    --meter-ok: #3987e5;
    --meter-ok-track: #12325c;
    --meter-warn: #e0a01a;
    --meter-warn-track: #3d2f08;
    --meter-over: #e66767;
    --meter-over-track: #401919;

    --focus: #d3b2ee;

    --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-2: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 18px -6px rgba(0, 0, 0, 0.6);
    --shadow-3: 0 2px 4px rgba(0, 0, 0, 0.5), 0 22px 48px -12px rgba(0, 0, 0, 0.75);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --accent: #bf93e2;
  --accent-strong: #d3b2ee;
  --accent-soft: #241033;
  --accent-border: #4d2c6a;
  --accent-ink: #1a0a26;
  --accent-glow: rgba(191, 147, 226, 0.22);

  --plane: #0c0c0d;
  --plane-2: #121213;
  --surface-1: #19191a;
  --surface-2: #222223;
  --surface-3: #2c2c2d;
  --overlay: rgba(0, 0, 0, 0.66);

  --ink-1: #f7f7f5;
  --ink-2: #b9b8b2;
  --ink-3: #86857f;
  --ink-invert: #0b0b0b;

  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.20);
  --track: #222223;

  --good-soft: #0e2a0e;
  --good-ink: #5fd15f;
  --warning-soft: #33280a;
  --warning-ink: #f0bb4a;
  --critical-soft: #331616;
  --critical-ink: #ef9a9a;

  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
  --series-4: #c98500;
  --series-5: #d55181;
  --series-6: #17a217;

  --meter-ok: #3987e5;
  --meter-ok-track: #12325c;
  --meter-warn: #e0a01a;
  --meter-warn-track: #3d2f08;
  --meter-over: #e66767;
  --meter-over-track: #401919;

  --focus: #d3b2ee;

  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-2: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 18px -6px rgba(0, 0, 0, 0.6);
  --shadow-3: 0 2px 4px rgba(0, 0, 0, 0.5), 0 22px 48px -12px rgba(0, 0, 0, 0.75);
}

/* ------------------------------------------------------ 2. Reset & base */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--plane);
  /* A very low-contrast wash off the top edge, so the page has a light source
     and the topbar does not float on a flat field. */
  background-image: radial-gradient(
    120rem 40rem at 50% -18rem,
    var(--plane-2) 0%,
    transparent 70%
  );
  background-repeat: no-repeat;
  color: var(--ink-1);
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-synthesis-weight: none;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.22;
  font-weight: 640;
  letter-spacing: -0.018em;
  color: var(--ink-1);
}

h1 {
  font-size: var(--fs-xl);
}
h2 {
  font-size: var(--fs-lg);
}
h3 {
  font-size: var(--fs-md);
}

p {
  margin: 0 0 var(--sp-3);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.14s var(--ease);
}

a:hover {
  color: var(--accent-strong);
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

code,
kbd {
  font-family: var(--mono);
  font-size: 0.92em;
}

::selection {
  background: var(--accent-soft);
  color: var(--ink-1);
}

/* Scrollbars that do not shout, on the panes that actually scroll. */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--r-full);
  border: 3px solid transparent;
  background-clip: content-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--ink-3);
  background-clip: content-box;
}

/* --------------------------------------------- 3. Layout shell & topbar */

.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--sp-5) var(--sp-8);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin: 0 calc(var(--sp-5) * -1) var(--sp-6);
  padding: var(--sp-3) var(--sp-5);
  background: color-mix(in srgb, var(--plane) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

/* color-mix is recent; without it the bar must still be opaque or the page
   scrolls visibly underneath it. */
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .topbar {
    background: var(--plane);
  }
}

.topbar__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.125rem;
  height: 2.125rem;
  flex: none;
  border-radius: var(--r-sm);
  background: linear-gradient(160deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: var(--accent-ink);
  font-weight: 700;
  font-size: 0.6875rem;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-1);
}

.topbar__title {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-right: auto;
  min-width: 0;
}

.topbar__title strong {
  font-size: var(--fs-base);
  font-weight: 640;
  letter-spacing: -0.014em;
  line-height: 1.3;
}

.topbar__title span {
  font-size: var(--fs-xs);
  color: var(--ink-3);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-weight: 560;
}

.lede {
  color: var(--ink-2);
  font-size: var(--fs-md);
  line-height: 1.58;
  max-width: 62ch;
  margin: 0 0 var(--sp-6);
  text-wrap: pretty;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.row {
  display: flex;
  gap: var(--sp-3);
  align-items: center;
  flex-wrap: wrap;
}

.row--tight {
  gap: var(--sp-2);
}

.spacer {
  margin-left: auto;
}

.footer {
  margin-top: var(--sp-7);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
  color: var(--ink-3);
  font-size: var(--fs-sm);
  display: flex;
  gap: var(--sp-2) var(--sp-5);
  flex-wrap: wrap;
  align-items: center;
}

/* ------------------------------------------------------ 4. Cards & grids */

.card {
  position: relative;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  box-shadow: var(--shadow-1);
}

.card--flush {
  padding: 0;
  overflow: hidden;
}

.card__head {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-4);
}

.card__head > h2,
.card__head > h3,
.card__head > strong,
.card__head > div:first-child {
  margin-right: auto;
}

.card__head strong {
  font-size: var(--fs-md);
  font-weight: 640;
  letter-spacing: -0.014em;
}

.card__note {
  color: var(--ink-2);
  font-size: var(--fs-sm);
  line-height: 1.55;
  margin: 0 0 var(--sp-4);
  max-width: 68ch;
}

.card__foot {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  align-items: center;
  margin-top: var(--sp-5);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
}

.grid {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

/* --------------------------------------------------------- 5. Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.5rem 0.95rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface-1);
  color: var(--ink-1);
  font: inherit;
  font-size: var(--fs-sm);
  font-weight: 560;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  box-shadow: var(--shadow-1);
  transition: background 0.14s var(--ease), border-color 0.14s var(--ease),
    box-shadow 0.14s var(--ease), transform 0.08s var(--ease), color 0.14s var(--ease);
}

.btn:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--surface-2);
  border-color: var(--ink-3);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
  box-shadow: none;
}

.btn:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn--primary {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-strong) 100%);
  border-color: var(--accent-strong);
  color: var(--accent-ink);
  box-shadow: var(--shadow-1), inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.btn--primary:hover:not(:disabled) {
  background: linear-gradient(180deg, var(--accent-strong) 0%, var(--accent-strong) 100%);
  border-color: var(--accent-strong);
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--ink-2);
  box-shadow: none;
}

.btn--ghost:hover:not(:disabled) {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--ink-1);
}

.btn--danger {
  color: var(--critical-ink);
  border-color: var(--border-strong);
  background: var(--surface-1);
}

.btn--danger:hover:not(:disabled) {
  background: var(--critical-soft);
  border-color: var(--critical);
}

.btn--sm {
  padding: 0.3rem 0.62rem;
  font-size: var(--fs-xs);
  border-radius: var(--r-xs);
}

.btn--block {
  width: 100%;
}

/* ----------------------------------------------------------- 6. Forms */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  min-width: 0;
}

.field > label {
  font-size: var(--fs-sm);
  font-weight: 580;
  color: var(--ink-1);
  letter-spacing: -0.005em;
}

.field__hint {
  font-size: var(--fs-xs);
  color: var(--ink-3);
  margin: 0;
  line-height: 1.5;
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="number"],
input[type="search"],
select,
textarea {
  width: 100%;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface-1);
  color: var(--ink-1);
  font: inherit;
  font-size: var(--fs-sm);
  line-height: 1.5;
  transition: border-color 0.14s var(--ease), box-shadow 0.14s var(--ease),
    background 0.14s var(--ease);
}

input:hover:not(:disabled),
select:hover:not(:disabled),
textarea:hover:not(:disabled) {
  border-color: var(--ink-3);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}

input:disabled,
select:disabled,
textarea:disabled {
  background: var(--surface-2);
  color: var(--ink-3);
  cursor: not-allowed;
  border-color: var(--border);
}

textarea {
  resize: vertical;
  min-height: 5rem;
  line-height: 1.6;
}

input::placeholder,
textarea::placeholder {
  color: var(--ink-3);
  opacity: 1;
}

/* A native select arrow cannot be styled, and the default differs enough
   between platforms to make a row of controls look mismatched. */
select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 2rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%238b8a84' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.7rem center;
  cursor: pointer;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--accent);
  width: auto;
}

.mono {
  font-family: var(--mono);
  font-size: var(--fs-sm);
  letter-spacing: -0.01em;
}

/* ------------------------------------------------------- 7. Key panel */

.keypanel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--accent-border);
  background: var(--surface-1);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  margin-bottom: var(--sp-6);
  box-shadow: var(--shadow-2);
}

/* A violet edge, so the one thing the page needs from you reads as the one
   thing the page needs from you. */
.keypanel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-strong) 100%);
}

.keypanel__head {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  margin-bottom: var(--sp-4);
}

.keypanel__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 1.75rem;
  height: 1.75rem;
  margin-top: 1px;
  border-radius: var(--r-full);
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  color: var(--accent);
  font-size: 1.1rem;
  line-height: 1;
}

.keypanel__title {
  font-size: var(--fs-md);
  font-weight: 640;
  letter-spacing: -0.016em;
  margin: 0 0 2px;
}

.keypanel__sub {
  margin: 0;
  color: var(--ink-2);
  font-size: var(--fs-sm);
  line-height: 1.55;
  max-width: 62ch;
}

.keypanel .field {
  max-width: 30rem;
}

/* The reveal button sits inside the input's border rather than beside it, so
   the control reads as one object. */
.keyinput {
  position: relative;
  display: flex;
  align-items: center;
}

.keyinput input {
  padding-right: 4.25rem;
}

.keyinput__peek {
  position: absolute;
  right: 5px;
  padding: 0.25rem 0.5rem;
  border: 1px solid transparent;
  border-radius: var(--r-xs);
  background: var(--surface-2);
  color: var(--ink-2);
  font: inherit;
  font-size: var(--fs-xs);
  font-weight: 580;
  cursor: pointer;
  transition: background 0.14s var(--ease), color 0.14s var(--ease);
}

.keyinput__peek:hover {
  background: var(--surface-3);
  color: var(--ink-1);
}

.keypanel__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-top: var(--sp-4);
}

.keypanel__status {
  font-size: var(--fs-sm);
  color: var(--ink-2);
}

.keypanel__status.is-error {
  color: var(--critical-ink);
  font-weight: 560;
}

.keypanel__warn {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  margin-top: var(--sp-5);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
  background: var(--warning-soft);
  border: 1px solid color-mix(in srgb, var(--warning) 45%, transparent);
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .keypanel__warn {
    border-color: var(--warning);
  }
}

.keypanel__warn-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 2px;
  border-radius: var(--r-full);
  background: var(--warning);
  color: #3a2800;
  font-size: var(--fs-xs);
  font-weight: 800;
  line-height: 1;
}

.keypanel__warn-text {
  margin: 0;
  color: var(--warning-ink);
  font-size: var(--fs-sm);
  line-height: 1.55;
}

.keypanel__warn-text strong {
  font-weight: 680;
}

.keybar {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  padding: 0.5rem var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-1);
  box-shadow: var(--shadow-1);
  margin-bottom: var(--sp-6);
  font-size: var(--fs-sm);
}

.keybar__dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: var(--r-full);
  background: var(--good);
  flex: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--good) 20%, transparent);
}

.keybar__text {
  font-size: var(--fs-sm);
  color: var(--ink-2);
  font-family: var(--mono);
  letter-spacing: -0.01em;
}

/* One badge per third-party vendor the connected key may call, filled in from
   GET /v1/key once the gateway answers. A key is scoped, so this is the only
   place a visitor can see what theirs actually reaches before picking a model.
   Amber = mock (no vendor credential), red = allowance already spent. */
.keybar__access {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
}

.keybar__forget:hover:not(:disabled) {
  color: var(--critical-ink);
  background: var(--critical-soft);
  border-color: transparent;
}

/* ------------------------------------------ 8. Badges, readout, meters */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 0.14rem 0.5rem;
  border-radius: var(--r-full);
  font-size: var(--fs-xs);
  font-weight: 620;
  letter-spacing: 0.005em;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-2);
  white-space: nowrap;
  line-height: 1.5;
}

.badge--good {
  background: var(--good-soft);
  color: var(--good-ink);
  border-color: transparent;
}

.badge--warn {
  background: var(--warning-soft);
  color: var(--warning-ink);
  border-color: transparent;
}

.badge--bad {
  background: var(--critical-soft);
  color: var(--critical-ink);
  border-color: transparent;
}

.badge--accent {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent-border);
}

/* The gateway readout: what the X-NYU-* headers said about the last call.
   This strip is the reason these are Archway demos and not generic chat toys. */
.readout {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3) var(--sp-5);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-2);
  font-size: var(--fs-xs);
}

.readout__item {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.readout__label {
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.055em;
  font-size: 0.625rem;
  font-weight: 640;
  line-height: 1.4;
}

.readout__value {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  color: var(--ink-1);
  overflow-wrap: anywhere;
  font-weight: 540;
}

.meter {
  height: 0.375rem;
  border-radius: var(--r-full);
  background: var(--meter-ok-track);
  overflow: hidden;
  min-width: 6rem;
}

.meter__fill {
  height: 100%;
  background: var(--meter-ok);
  border-radius: var(--r-full);
  transition: width 0.4s var(--ease);
}

.meter--warn {
  background: var(--meter-warn-track);
}
.meter--warn .meter__fill {
  background: var(--meter-warn);
}
.meter--over {
  background: var(--meter-over-track);
}
.meter--over .meter__fill {
  background: var(--meter-over);
}

/* ------------------------------ 9. Messages, alerts, empty states */

.msg {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--surface-1);
  animation: rise 0.22s var(--ease) both;
}

.msg--user {
  background: var(--accent-soft);
  border-color: var(--accent-border);
}

.msg__role {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-3);
}

.msg--user .msg__role {
  color: var(--accent);
}

/* Model output is untrusted text written with textContent, so `white-space` is
   what preserves its paragraphs rather than any markdown rendering. */
.msg__body {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 0;
  font-family: inherit;
  font-size: var(--fs-base);
  line-height: 1.62;
  color: var(--ink-1);
}

.alert {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
  border: 1px solid color-mix(in srgb, var(--critical) 50%, transparent);
  background: var(--critical-soft);
  color: var(--critical-ink);
  font-size: var(--fs-sm);
  line-height: 1.55;
  animation: rise 0.22s var(--ease) both;
}

@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .alert {
    border-color: var(--critical);
  }
}

.alert__title {
  font-weight: 660;
  font-size: var(--fs-sm);
}

.alert code {
  overflow-wrap: anywhere;
}

.empty {
  padding: var(--sp-7) var(--sp-4);
  text-align: center;
  color: var(--ink-3);
  font-size: var(--fs-sm);
  line-height: 1.6;
}

/* ------------------------------------------------- 10. Motion & utility */

/* Blinking caret while a stream is in flight. */
.streaming::after {
  content: "";
  display: inline-block;
  width: 0.5em;
  height: 1.05em;
  margin-left: 1px;
  vertical-align: text-bottom;
  background: var(--accent);
  border-radius: 1px;
  animation: blink 1.05s steps(2, start) infinite;
}

@keyframes blink {
  to {
    opacity: 0;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  display: inline-block;
  width: 0.875rem;
  height: 0.875rem;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: var(--r-full);
  animation: spin 0.62s linear infinite;
  flex: none;
}

.hidden {
  display: none !important;
}

.muted {
  color: var(--ink-2);
}

.small {
  font-size: var(--fs-sm);
}

.xs {
  font-size: var(--fs-xs);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .streaming::after {
    animation: none;
    opacity: 1;
  }
}

/* ------------------------------------------------------- 11. Responsive */

@media (max-width: 40rem) {
  :root {
    --fs-xl: 1.5rem;
    --fs-lg: 1.1875rem;
  }

  .shell {
    padding: 0 var(--sp-4) var(--sp-7);
  }

  .topbar {
    margin: 0 calc(var(--sp-4) * -1) var(--sp-5);
    padding: var(--sp-3) var(--sp-4);
  }

  .card,
  .keypanel {
    padding: var(--sp-4);
    border-radius: var(--r-md);
  }

  .lede {
    font-size: var(--fs-base);
    margin-bottom: var(--sp-5);
  }

  .readout {
    gap: var(--sp-3);
  }

  .btn {
    padding: 0.5rem 0.8rem;
  }
}