:root {
  color-scheme: dark;
  --ink: #f7f1df;
  --muted: #b7ad97;
  --quiet: #7a715f;
  --void: #080806;
  --charcoal: #11100d;

  /* Modern dynamic colors */
  --panel: color-mix(in srgb, var(--ink) 7.5%, transparent);
  --panel-strong: color-mix(in srgb, var(--ink) 12%, transparent);
  --line: color-mix(in srgb, var(--ink) 18%, transparent);
  --line-strong: color-mix(in srgb, var(--ink) 34%, transparent);

  --signal: #a7ff4f;
  --copper: #ff9f5f;
  --cyan: #7dd8ff;
  --red: #ff5b4f;
  --max: 1480px;
  --pad: clamp(16px, 3vw, 34px);
  --display: Georgia, "Times New Roman", serif;
  --body: "Aptos", "Segoe UI", "Helvetica Neue", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* HAI Smoothness */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: all 0.2s var(--ease);
}

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

html {
  min-width: 320px;
  background: var(--void);
  scroll-behavior: smooth;
  text-size-adjust: none;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--ink) 5.5%, transparent) 1px, transparent 1px),
    linear-gradient(180deg, color-mix(in srgb, var(--ink) 3.5%, transparent) 1px, transparent 1px),
    linear-gradient(135deg, color-mix(in srgb, var(--signal) 12%, transparent), transparent 32%),
    linear-gradient(220deg, color-mix(in srgb, var(--cyan) 10%, transparent), transparent 38%),
    var(--void);
  background-size: 76px 76px, 76px 76px, auto, auto, auto;
  font-family: var(--body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

p,
li {
  text-wrap: pretty;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  text-wrap: balance;
}

p,
h1,
h2 {
  margin: 0;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.26;
  background-image: url("../assets/hai-interface-background.webp");
  background-position: center;
  background-size: cover;
  mix-blend-mode: screen;
  mask-image: linear-gradient(180deg, black, transparent 72%);
}

a {
  color: inherit;
  transition: var(--transition);
}

button,
input,
textarea {
  font: inherit;
}

button,
a.primary-action {
  min-height: 42px;
}

button {
  cursor: pointer;
  transition: var(--transition);

  &:disabled,
  &.disabled {
    cursor: not-allowed;
    opacity: 0.48;
  }
}

.site-shell {
  position: relative;
  z-index: 1;
  min-height: 100svh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-block: 14px;
  padding-inline: var(--pad);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 13%, transparent);
  background: color-mix(in srgb, var(--void) 78%, transparent);
  backdrop-filter: blur(18px);
}

.brand,
.topnav {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  transition: var(--transition);

  &:hover,
  &:focus-visible {
    color: var(--ink);
  }
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  color: var(--signal);
}

.topnav a {
  text-decoration: none;
}

.workbench {
  width: min(var(--max), 100%);
  min-height: calc(100svh - 62px);
  margin-inline: auto;
  padding: var(--pad);
  display: grid;
  grid-template-columns: minmax(280px, 0.84fr) minmax(360px, 1.22fr) minmax(290px, 0.9fr);
  gap: 16px;
  align-items: stretch;
}

.intake-panel,
.session-panel,
.summary-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--void) 72%, transparent);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.24);
}

.intake-panel,
.summary-panel {
  padding: 18px;
}

.session-panel {
  display: grid;
  grid-template-rows: auto auto minmax(340px, 1fr) auto;
  overflow: hidden;
}

.panel-head {
  display: grid;
  gap: 8px;
  margin-block-end: 18px;
}

.kicker {
  color: var(--copper);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  color: var(--ink);
  letter-spacing: 0;
}

h1 {
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 3.9rem);
  font-weight: 500;
  line-height: 0.98;
}

h2 {
  font-size: clamp(1.08rem, 1.8vw, 1.44rem);
  font-weight: 650;
}

.panel-head p:not(.kicker),
.summary-output,
.message p,
.safety-strip,
.consent {
  color: var(--muted);
}

.intake-form,
.summary-actions {
  display: grid;
  gap: 14px;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

legend,
.field span,
.message-role,
.summary-label {
  display: block;
  margin-block-end: 7px;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.level-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.choice {
  min-height: 42px;
  display: grid;
  place-items: center;
  padding-block: 8px;
  padding-inline: 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--ink) 4.5%, transparent);
  color: var(--muted);
  text-align: center;
  font-size: 13px;
  transition: var(--transition);
  cursor: pointer;

  input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
  }

  &:hover {
    border-color: var(--line-strong);
    background: color-mix(in srgb, var(--ink) 8%, transparent);
  }

  &:has(input:checked) {
    border-color: color-mix(in srgb, var(--signal) 58%, transparent);
    background: color-mix(in srgb, var(--signal) 11%, transparent);
    color: var(--ink);
  }
}

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

textarea,
input[type="text"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, #000 28%, transparent);
  color: var(--ink);
  outline: none;
  transition: var(--transition);

  &:focus {
    border-color: color-mix(in srgb, var(--cyan) 72%, transparent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--cyan) 8%, transparent);
  }
}

textarea {
  resize: vertical;
  min-height: 74px;
  padding-block: 11px;
  padding-inline: 12px;
}

input[type="text"] {
  min-height: 42px;
  padding-inline: 12px;
}

.guardrails {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.guardrails label,
.consent {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
}

.session-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding-block: 18px 14px;
  padding-inline: 18px;
  border-bottom: 1px solid var(--line);
}

.meters {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  white-space: nowrap;

  span {
    min-width: 58px;
    min-height: 32px;
    display: inline-grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: color-mix(in srgb, var(--ink) 5%, transparent);
  }
}

.safety-strip {
  padding-block: 10px;
  padding-inline: 18px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--copper) 8%, transparent);
  font-family: var(--mono);
  font-size: 12px;
}

.chat-log {
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
  overflow-y: auto;
}

.message {
  width: min(88%, 680px);
  padding-block: 12px;
  padding-inline: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--ink) 5%, transparent);

  &.user {
    align-self: flex-end;
    border-color: color-mix(in srgb, var(--cyan) 32%, transparent);
    background: color-mix(in srgb, var(--cyan) 8%, transparent);
  }

  &.agent {
    align-self: flex-start;
  }

  &.warning {
    border-color: color-mix(in srgb, var(--red) 52%, transparent);
    background: color-mix(in srgb, var(--red) 8%, transparent);
  }

  p + p {
    margin-block-start: 9px;
  }
}

.chat-form {
  display: grid;
  gap: 10px;
  padding-block: 14px 18px;
  padding-inline: 18px;
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--void) 78%, transparent);

  textarea {
    min-height: 58px;
  }
}

.chat-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding-inline: 14px;
  text-decoration: none;
  font-weight: 700;
  transition: var(--transition);
}

.primary-action {
  border: 1px solid color-mix(in srgb, var(--signal) 52%, transparent);
  background: color-mix(in srgb, var(--signal) 14%, transparent);
  color: var(--ink);

  &:hover:not(:disabled) {
    background: color-mix(in srgb, var(--signal) 24%, transparent);
    border-color: var(--ink);
  }
}

.secondary-action {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--ink) 5%, transparent);
  color: var(--ink);

  &:hover:not(:disabled) {
    background: color-mix(in srgb, var(--ink) 10%, transparent);
    border-color: var(--ink);
  }
}

.summary-output {
  min-height: 280px;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, #000 25%, transparent);
  overflow-wrap: anywhere;
}

.summary-block {
  display: grid;
  gap: 4px;
}

.summary-value {
  color: var(--ink);
}

.summary-text {
  margin: 0;
  color: var(--ink);
  font: inherit;
  white-space: pre-wrap;
}

.empty-state {
  color: var(--quiet);
}

.mail-link.disabled {
  pointer-events: none;
}

.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 (max-width: 1180px) {
  .workbench {
    grid-template-columns: minmax(280px, 0.82fr) minmax(380px, 1.18fr);
  }

  .summary-panel {
    grid-column: 1 / -1;
  }
}

@media (max-width: 820px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .topnav {
    flex-wrap: wrap;
  }

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

  .session-panel {
    grid-template-rows: auto auto minmax(360px, 52svh) auto;
  }
}

@media (max-width: 560px) {
  .choice-grid,
  .level-grid,
  .guardrails {
    grid-template-columns: 1fr;
  }

  .session-toolbar,
  .chat-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .meters {
    width: 100%;

    span {
      flex: 1;
    }
  }

  .message {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
  }
}