:root {
  --bg: #f5f5f7;
  --paper: #ffffff;
  --fg: #1d1d1f;
  --dim: #6e6e73;
  --hair: rgba(0, 0, 0, 0.08);
  --fill: #1d1d1f;
  --on-fill: #f5f5f7;
  --ok: #1d8348;
  --bad: #b54a4a;
  --font: -apple-system, "SF Pro Text", "SF Pro Display", "Segoe UI", system-ui,
    sans-serif;
  --display: -apple-system, "SF Pro Display", "Segoe UI", system-ui, sans-serif;
  --ease: 0.45s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--fg);
  color: var(--paper);
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  opacity: 0.55;
}

.shell {
  min-height: 100svh;
  padding: clamp(1.25rem, 4vw, 3rem) clamp(1.25rem, 6vw, 7rem)
    clamp(3rem, 8vw, 6rem);
}

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--hair);
}

.brand {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dim);
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.nav a[aria-current="page"] {
  color: var(--fg);
}

.hero {
  padding: clamp(3.5rem, 12vh, 8rem) 0 clamp(2.5rem, 8vh, 5rem);
  max-width: 52rem;
}

.kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 1.25rem;
}

.shell > .kicker {
  margin-top: 2rem;
}

.kicker a {
  color: inherit;
}

.display {
  font-family: var(--display);
  font-size: clamp(2.4rem, 6.2vw, 4.6rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.04;
  margin: 0 0 1.1rem;
  text-wrap: pretty;
}

.lede {
  margin: 0;
  max-width: 32rem;
  color: var(--dim);
  font-size: 1.2rem;
  font-weight: 400;
  line-height: 1.45;
}

.panel {
  max-width: 40rem;
  padding-top: 0.5rem;
}

.field {
  display: block;
  margin: 0 0 1.75rem;
}

.field span {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 0.55rem;
}

.field input,
.field textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--hair);
  background: transparent;
  color: var(--fg);
  font-family: inherit;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  padding: 0.55rem 0 0.7rem;
  border-radius: 0;
  outline: none;
  resize: vertical;
  transition: border-color var(--ease);
}

.field input:focus,
.field textarea:focus {
  border-bottom-color: var(--fg);
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin: 2rem 0 3rem;
}

.btn {
  appearance: none;
  border: 0;
  background: var(--fill);
  color: var(--on-fill);
  min-height: 2.75rem;
  padding: 0 1.4rem;
  border-radius: 980px;
  font-family: inherit;
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: opacity var(--ease), transform var(--ease);
}

.btn:hover {
  opacity: 0.88;
}

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  color: var(--dim);
  letter-spacing: 0.01em;
}

.chip i {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--dim);
}

.chip[data-state="ok"] i {
  background: var(--ok);
}

.chip[data-state="bad"] i {
  background: var(--bad);
}

.out {
  min-height: 8rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--hair);
}

.out h2,
.hits h2,
.doc h2 {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 1rem;
}

.answer {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.3;
  white-space: pre-wrap;
}

.hits {
  margin-top: 3.5rem;
}

.hit {
  padding: 1.35rem 0;
  border-top: 1px solid var(--hair);
}

.hit strong {
  display: block;
  font-weight: 500;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.hit p {
  margin: 0;
  color: var(--dim);
  font-size: 0.95rem;
}

.probes {
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: 1.1rem;
  overflow: hidden;
  margin: 0 0 4.5rem;
  max-width: 44rem;
}

.probe {
  background: var(--paper);
  padding: 1.5rem 1.6rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.probe b {
  font-weight: 500;
}

.probe span {
  color: var(--dim);
  font-size: 0.95rem;
}

.doc {
  max-width: 44rem;
  padding: 4rem 0 1rem;
}

.doc h1 {
  font-family: var(--display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  margin: 0 0 1rem;
}

.doc h2 {
  margin: 2.4rem 0 0.8rem;
  font-size: 0.72rem;
}

.doc p,
.doc li {
  color: var(--dim);
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.95rem;
}

.doc th,
.doc td {
  text-align: left;
  padding: 0.7rem 0.6rem 0.7rem 0;
  border-bottom: 1px solid var(--hair);
  vertical-align: top;
}

.doc th {
  color: var(--dim);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.doc td {
  color: var(--fg);
}

.doc pre,
.doc code {
  font-family: ui-monospace, "SF Mono", "Segoe UI Mono", Consolas, monospace;
  font-size: 0.84rem;
}

.doc pre {
  background: var(--paper);
  border: 1px solid var(--hair);
  border-radius: 0.75rem;
  padding: 1rem 1.1rem;
  overflow: auto;
}

.locked-q {
  display: block;
  margin: 1.5rem 0 1.75rem;
  max-width: 32rem;
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.3;
}

.corpus {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  max-width: 36rem;
}

.corpus li {
  padding: 0.75rem 0;
  border-top: 1px solid var(--hair);
  color: var(--dim);
  font-size: 0.95rem;
  line-height: 1.45;
}

.corpus li:last-child {
  border-bottom: 1px solid var(--hair);
}

.corpus a {
  color: var(--fg);
  border-bottom: 1px solid var(--hair);
}

.foot {
  margin-top: 5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hair);
  color: var(--dim);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.enter {
  animation: rise 0.55s var(--ease) both;
}

.enter-2 {
  animation-delay: 0.08s;
}

.enter-3 {
  animation-delay: 0.16s;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.desk {
  display: grid;
  grid-template-columns: minmax(13rem, 17rem) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-top: 2.5rem;
  max-width: 54rem;
}

.thread-list {
  border-top: 1px solid var(--hair);
}

.thread-list button {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--hair);
  padding: 1.05rem 0 1.15rem;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

.thread-list button[aria-current="true"] {
  color: var(--fg);
}

.thread-list .from {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
}

.thread-list .subj {
  display: block;
  margin-top: 0.2rem;
  color: var(--dim);
  font-size: 0.88rem;
}

.mail {
  margin: 0 0 2rem;
  color: var(--fg);
  font-size: 1.15rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

@media (max-width: 720px) {
  .desk {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .enter,
  .enter-2,
  .enter-3,
  .btn {
    animation: none;
    transition: none;
    transform: none;
  }
}