/* ==========================================================
   MAIL ROOM — hero, artifact field, reading, write
   ========================================================== */

.mail-room-hero {
  position: relative;

  --hero-scale: 1;
  --hero-blur: 0px;
  --hero-kicker-opacity: 0;
}

.mail-room-hero__track {
  height: clamp(28rem, 115vh, 52rem);

  pointer-events: none;
}

.mail-room-hero__sticky {
  position: sticky;

  top: 0;

  display: grid;
  place-items: center;

  height: clamp(18rem, 72vh, 36rem);
  min-height: min(72vh, 36rem);
  overflow: hidden;

  pointer-events: none;
}

/*
 * iOS Safari does not reliably clip transformed descendants of
 * position: sticky. Clip on this non-sticky layer instead so the
 * media can keep inset/-2% + --hero-scale without widening the page.
 */
.mail-room-hero__clip {
  position: absolute;

  inset: 0;

  overflow: hidden;

  pointer-events: none;
}

.mail-room-hero__media {
  position: absolute;

  inset: -2%;

  transform: scale(var(--hero-scale));
  transform-origin: center center;

  will-change: transform;
}

.mail-room-hero__photo {
  display: block;

  width: 100%;
  height: 100%;

  object-fit: cover;
  object-position: center 42%;

  filter: blur(var(--hero-blur));
}

.mail-room-hero__titles {
  position: relative;

  z-index: 2;

  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(0.35rem, 1.1vw, 0.6rem);

  margin: 0;
  padding: 0 clamp(1.25rem, 4vw, 3rem);

  opacity: var(--hero-kicker-opacity);

  text-align: center;
}

.mail-room-hero__room {
  margin: 0;

  color: var(--site-text-muted);

  font-family: var(--heading-font);
  font-size: clamp(1.05rem, 2.8vw, 1.45rem);
  font-weight: 400;
  letter-spacing: 0.16em;
  line-height: 1.1;
  text-transform: uppercase;
}

.mail-room-hero__kicker {
  position: relative;

  z-index: 2;

  margin: 0;
  padding: 0;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(2.75rem, 8vw, 5.5rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 0.92;
  text-align: center;
  text-transform: uppercase;
}

.mail-room-field {
  max-width: var(--site-max-width);
  margin: 0 auto;

  padding: clamp(1.5rem, 4vw, 2.75rem) clamp(1.25rem, 4vw, 3rem)
    clamp(3rem, 8vw, 5rem);
}

.mail-room-field__intro {
  max-width: 34rem;
  margin: 0 0 clamp(2.5rem, 6vw, 4rem);

  color: var(--site-text-muted);

  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  line-height: 1.65;
}

.mail-room-field__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.75rem);
}

.mail-artifact {
  display: grid;
  gap: 0.85rem;

  padding: 0;

  border: none;

  background: transparent;
}

.mail-artifact--a {
  max-width: 38rem;
}

.mail-artifact--b {
  max-width: 30rem;
}

.mail-artifact--c {
  max-width: 34rem;
  margin-right: auto;
}

.mail-artifact--d {
  max-width: 28rem;
}

.mail-artifact--e {
  max-width: 36rem;
}

.mail-artifact--f {
  max-width: 40rem;
  margin-right: auto;
}

.mail-artifact--g {
  max-width: 32rem;
}

.mail-artifact__route {
  margin: 0;

  font-family: var(--heading-font);
  font-size: clamp(1.65rem, 3.2vw, 2.35rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 0.98;
  text-transform: uppercase;
}

.mail-artifact--b .mail-artifact__route {
  font-size: clamp(1.45rem, 2.8vw, 2rem);
}

.mail-artifact--d .mail-artifact__route {
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  letter-spacing: 0.06em;
}

.mail-artifact--f .mail-artifact__route {
  font-size: clamp(1.85rem, 3.6vw, 2.65rem);
}

.mail-artifact__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;

  margin: 0;
}

.mail-artifact__date {
  margin: 0;

  color: var(--site-text-muted);

  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.mail-artifact__note {
  margin: 0;

  color: var(--purple);

  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.mail-artifact__preview {
  max-width: 36rem;
  margin: 0;

  color: var(--site-text-muted);

  font-size: clamp(0.92rem, 1.2vw, 1rem);
  line-height: 1.6;
}

.mail-artifact__open {
  justify-self: start;

  min-height: 2.75rem;

  margin: 0.25rem 0 0;
  padding: 0.55rem 0;

  border: none;
  border-bottom: 1px solid currentColor;

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(0.9rem, 1.6vw, 1.05rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-artifact__open:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

.mail-room-write {
  position: relative;

  z-index: 3;

  background: var(--yellow);

  color: var(--site-text);
}

.mail-room-write__inner {
  max-width: var(--site-max-width);
  margin: 0 auto;

  padding: clamp(2.5rem, 7vw, 4.5rem) clamp(1.25rem, 4vw, 3rem);
}

.mail-room-write__room {
  margin: 0 0 0.75rem;

  color: rgba(17, 17, 17, 0.62);

  font-family: var(--heading-font);
  font-size: clamp(1.05rem, 2.8vw, 1.45rem);
  font-weight: 400;
  letter-spacing: 0.16em;
  line-height: 1.1;
  text-transform: uppercase;
}

.mail-room-write__title {
  margin: 0 0 1.25rem;

  font-family: var(--heading-font);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 0.95;
  text-transform: uppercase;
}

.mail-room-write__copy {
  max-width: 38rem;
  margin: 0;

  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.65;
}

.mail-room-write__copy + .mail-room-write__copy {
  margin-top: 1rem;
}

.mail-room-write__cta {
  min-height: 2.75rem;

  margin-top: 1.75rem;
  padding: 0.65rem 0;

  border: none;
  border-top: 1px solid rgba(17, 17, 17, 0.22);

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-align: left;
  text-transform: uppercase;

  cursor: pointer;

  opacity: 1;
}

.mail-room-write__cta:disabled,
.mail-room-write__cta[aria-disabled="true"] {
  cursor: not-allowed;

  opacity: 0.55;
}

.mail-room-write__cta:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

/* --- Reading encounter ------------------------------------- */

.mail-reading {
  width: min(calc(100% - 2rem), 52rem);
  max-width: 100%;
  max-height: calc(100vh - 2rem);
  margin: auto;
  padding: 0;

  border: none;
  border-radius: 0.35rem;

  background: var(--site-surface);

  color: var(--site-text);

  overflow: hidden;
}

.mail-reading::backdrop {
  background: rgba(255, 255, 255, 0.72);

  backdrop-filter: blur(6px);
}

.mail-reading__panel {
  display: flex;
  flex-direction: column;
  gap: 0;

  min-width: 0;
  max-height: calc(100vh - 2rem);
  overflow-x: hidden;
  overflow-y: auto;
}

.mail-reading__toolbar {
  position: sticky;

  top: 0;

  z-index: 2;

  min-width: 0;

  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;

  padding: clamp(0.85rem, 2vw, 1.15rem) clamp(1rem, 3vw, 1.5rem);

  background: rgba(255, 255, 255, 0.96);

  border-bottom: 1px solid var(--site-border);
}

.mail-reading__step {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.mail-reading__prev,
.mail-reading__next {
  min-height: 2.75rem;

  margin: 0;
  padding: 0.35rem 0;

  border: none;

  background: transparent;

  color: var(--site-text);

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  line-height: 1.2;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-reading__prev:hover:not(:disabled),
.mail-reading__next:hover:not(:disabled),
.mail-reading__prev:focus-visible,
.mail-reading__next:focus-visible {
  color: var(--site-text);
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 3px;
}

.mail-reading__prev:disabled,
.mail-reading__next:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.mail-reading__return {
  min-height: 2.75rem;

  margin: 0;
  padding: 0.35rem 0;

  border: none;

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-reading__return:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

.mail-reading__body {
  min-width: 0;
  max-width: 100%;

  padding: clamp(1.25rem, 3vw, 2rem) clamp(1rem, 3vw, 1.75rem)
    clamp(2rem, 5vw, 3rem);
}

.mail-reading__identity {
  min-width: 0;
  margin: 0 0 1.5rem;

  overflow-wrap: break-word;

  font-family: var(--heading-font);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
}

.mail-reading__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;

  margin: 0 0 2rem;

  color: var(--site-text-muted);

  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.mail-reading__transcription {
  min-width: 0;
  max-width: var(--site-reading-width);

  overflow-wrap: break-word;
  word-wrap: break-word;

  font-family: var(--body-font);
  font-size: clamp(1.05rem, 0.35vw + 0.95rem, 1.2rem);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

.mail-reading__transcription p {
  margin: 0 0 1.15em;
}

.mail-reading__transcription p:last-child {
  margin-bottom: 0;
}

.mail-reading__artifact--historical-paper {
  --paper-base: #f0ebe1;
  --paper-highlight: rgba(255, 252, 246, 0.58);
  --paper-shadow-tone: rgba(36, 30, 22, 0.05);
  --paper-warm-fox: rgba(104, 78, 46, 0.034);
  --paper-cool-fox: rgba(68, 84, 98, 0.024);
  --paper-edge: rgba(40, 33, 25, 0.1);
  --paper-ink: #1c1915;
  --paper-width: min(100%, var(--site-reading-width, 42rem));
  --paper-transcription-font: "IM Fell Double Pica", serif;
  --paper-pad-y: clamp(2.35rem, 5.5vw, 3.35rem);
  --paper-pad-x: clamp(1.85rem, 4.8vw, 2.75rem);
  --paper-edge-clip: polygon(
    0.55% 2.1%,
    0.95% 0.62%,
    2.1% 0.18%,
    9.5% 0.38%,
    17.8% 0.21%,
    26.4% 0.44%,
    34.2% 0.19%,
    43.8% 0.36%,
    52.1% 0.24%,
    61.7% 0.41%,
    63.8% 0.92%,
    72.3% 0.31%,
    81.6% 0.22%,
    90.4% 0.47%,
    96.8% 0.58%,
    98.2% 1.35%,
    99.1% 2.6%,
    99.6% 4.1%,
    99.72% 11%,
    99.58% 24%,
    99.78% 36%,
    98.72% 41.5%,
    99.65% 53%,
    99.52% 67%,
    99.68% 81%,
    99.35% 91%,
    98.9% 96.2%,
    97.1% 98.3%,
    94.8% 99.2%,
    86% 99.48%,
    73% 99.31%,
    59% 99.55%,
    45% 99.26%,
    31% 99.51%,
    19% 99.38%,
    9.5% 98.85%,
    3.8% 97.4%,
    1.4% 95.8%,
    0.42% 93.1%,
    0.18% 89%,
    0.28% 74%,
    0.45% 58%,
    0.21% 43%,
    0.38% 27%,
    0.24% 14%,
    0.55% 2.1%
  );

  position: relative;

  isolation: isolate;

  min-width: 0;
  width: 100%;
  max-width: var(--paper-width);
  margin: 0.15rem 0 0;

  padding: var(--paper-pad-y) var(--paper-pad-x);

  border: none;

  clip-path: var(--paper-edge-clip);

  background-color: var(--paper-base);
  background-image:
    radial-gradient(ellipse 88% 58% at 16% 10%, var(--paper-highlight), transparent 64%),
    radial-gradient(ellipse 72% 48% at 84% 14%, rgba(255, 255, 255, 0.26), transparent 56%),
    radial-gradient(ellipse 46% 34% at 74% 66%, var(--paper-warm-fox), transparent 72%),
    radial-gradient(ellipse 42% 32% at 22% 74%, var(--paper-cool-fox), transparent 70%),
    radial-gradient(ellipse 38% 28% at 58% 38%, rgba(98, 82, 58, 0.018), transparent 68%),
    radial-gradient(ellipse 58% 42% at 50% 96%, var(--paper-shadow-tone), transparent 74%),
    linear-gradient(
      184deg,
      rgba(255, 255, 255, 0.16) 0%,
      transparent 44%,
      rgba(0, 0, 0, 0.024) 100%
    );

  box-shadow: none;

  filter:
    drop-shadow(0 1px 1px rgba(22, 18, 14, 0.05))
    drop-shadow(0 5px 13px rgba(22, 18, 14, 0.055))
    drop-shadow(0 14px 28px rgba(22, 18, 14, 0.04));

  color: var(--paper-ink);
}

.mail-reading__artifact--historical-paper::before {
  content: "";

  position: absolute;

  inset: 0;

  opacity: 0.042;

  pointer-events: none;

  mix-blend-mode: multiply;

  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(38, 32, 26, 0.08) 2px,
      rgba(38, 32, 26, 0.08) 3px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 3px,
      rgba(38, 32, 26, 0.05) 3px,
      rgba(38, 32, 26, 0.05) 4px
    ),
    repeating-linear-gradient(
      47deg,
      transparent,
      transparent 5px,
      rgba(38, 32, 26, 0.028) 5px,
      rgba(38, 32, 26, 0.028) 6px
    );
}

.mail-reading__artifact--historical-paper::after {
  content: "";

  position: absolute;

  inset: 0;

  opacity: 0.9;

  pointer-events: none;

  background:
    radial-gradient(ellipse 30% 22% at 0% 0%, rgba(38, 30, 22, 0.042), transparent 72%),
    radial-gradient(ellipse 28% 20% at 100% 0%, rgba(38, 30, 22, 0.036), transparent 70%),
    radial-gradient(ellipse 32% 24% at 0% 100%, rgba(38, 30, 22, 0.048), transparent 74%),
    radial-gradient(ellipse 30% 22% at 100% 100%, rgba(38, 30, 22, 0.04), transparent 72%),
    radial-gradient(ellipse 120% 90% at 50% 50%, transparent 52%, rgba(36, 30, 22, 0.028) 100%);

  box-shadow:
    inset 0 0 0 1px var(--paper-edge),
    inset 0 0 36px rgba(36, 30, 22, 0.048),
    inset 0 0 96px rgba(36, 30, 22, 0.032);
}

.mail-reading__artifact--historical-paper .mail-reading__transcription {
  position: relative;

  z-index: 1;

  max-width: none;

  color: var(--paper-ink);

  font-family: var(--paper-transcription-font);
  font-size: clamp(1.02rem, 0.36vw + 0.92rem, 1.14rem);
  font-weight: 400;
  font-synthesis: none;
  line-height: 1.8;
  letter-spacing: 0.008em;
  text-rendering: optimizeLegibility;
}

/* Future accessible alternative hook — e.g. READ IN STANDARD TYPE */
.mail-reading__artifact--historical-paper
  .mail-reading__transcription.mail-reading__transcription--standard-type {
  font-family: var(--body-font);
  font-size: clamp(1.06rem, 0.35vw + 0.96rem, 1.2rem);
  line-height: 1.78;
  letter-spacing: normal;
}

/* Optional restrained paper variants — activated via modifier class when needed */
.mail-reading__artifact--historical-paper.mail-reading__artifact--paper-warm {
  --paper-base: #f2e9dd;
  --paper-warm-fox: rgba(112, 84, 50, 0.042);
}

.mail-reading__artifact--historical-paper.mail-reading__artifact--paper-cool {
  --paper-base: #eceee8;
  --paper-cool-fox: rgba(64, 80, 94, 0.032);
}

.mail-reading__artifact--historical-paper.mail-reading__artifact--paper-narrow {
  --paper-width: min(100%, 34rem);
  --paper-pad-x: clamp(1.65rem, 4.2vw, 2.35rem);
}

.mail-reading__after {
  max-width: var(--site-reading-width);
  margin-top: 2.5rem;
  padding-top: 1.5rem;

  border-top: 1px solid var(--site-border);
}

.mail-reading__after-title {
  margin: 0 0 0.85rem;

  font-family: var(--heading-font);
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.1;
  text-transform: uppercase;
}

.mail-reading__after-copy {
  margin: 0;

  color: var(--site-text-muted);

  font-size: clamp(0.95rem, 1.2vw, 1.05rem);
  line-height: 1.65;
}

.mail-reading__after-copy--unknown {
  font-style: italic;
}

.mail-reading__ps {
  max-width: var(--site-reading-width);
  margin-top: 2rem;
}

.mail-reading__ps-link {
  display: inline-flex;
  align-items: center;

  min-height: 2.75rem;

  color: var(--purple);

  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-decoration: none;
  text-transform: uppercase;
}

.mail-reading__ps-link:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

/* --- Contemporary browse placements ------------------------ */

.mail-artifact--h {
  max-width: 34rem;
}

.mail-artifact--i {
  max-width: 31rem;
}

.mail-artifact--j {
  max-width: 40rem;
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
}

.mail-artifact--k {
  max-width: 36rem;
}

/* --- Reading: digital message ------------------------------ */

.mail-reading__artifact--digital-message {
  min-width: 0;
  max-width: var(--site-reading-width);
  margin: 0;

  padding: clamp(1.45rem, 3.5vw, 2rem) clamp(1.35rem, 3vw, 1.85rem);

  border: 1px solid rgba(17, 17, 17, 0.08);

  background: #f9f9f8;

  box-shadow:
    0 1px 2px rgba(17, 17, 17, 0.04),
    0 8px 22px rgba(17, 17, 17, 0.05);
}

.mail-reading__artifact--digital-message .mail-reading__transcription {
  max-width: none;

  color: var(--site-text);

  font-family: "Roboto Mono", monospace;
  font-size: clamp(0.98rem, 0.32vw + 0.9rem, 1.08rem);
  font-weight: 400;
  font-synthesis: none;
  line-height: 1.82;
  letter-spacing: normal;
}

/* --- Reading: contemporary letter -------------------------- */

.mail-reading__artifact--contemporary-letter {
  min-width: 0;
  max-width: var(--site-reading-width);
  margin: 0;

  padding: clamp(2rem, 4.5vw, 2.85rem) clamp(1.75rem, 4vw, 2.5rem);

  border: 1px solid rgba(17, 17, 17, 0.09);
  border-radius: 2px;

  background: #ffffff;

  box-shadow:
    0 1px 2px rgba(17, 17, 17, 0.04),
    0 10px 28px rgba(17, 17, 17, 0.06);
}

.mail-reading__artifact--contemporary-letter .mail-reading__transcription {
  max-width: none;

  color: var(--site-text);

  font-family: "Roboto Mono", monospace;
  font-size: clamp(0.98rem, 0.32vw + 0.9rem, 1.08rem);
  font-weight: 400;
  font-synthesis: none;
  line-height: 1.82;
  letter-spacing: normal;
}

@media (max-width: 40rem) {
  .mail-artifact--a,
  .mail-artifact--b,
  .mail-artifact--c,
  .mail-artifact--d,
  .mail-artifact--e,
  .mail-artifact--f,
  .mail-artifact--g,
  .mail-artifact--h,
  .mail-artifact--i,
  .mail-artifact--j,
  .mail-artifact--k {
    width: 100%;
    max-width: 100%;

    margin-left: 0;
    margin-right: 0;
  }

  /*
   * iOS Safari: 100vh exceeds the visible viewport when browser chrome is
   * showing. A centered dialog sized to 100vh clips its top above the
   * reachable area; only the inner panel scrolls, so the toolbar stays trapped.
   */
  .mail-reading {
    inset: 0;

    width: 100%;
    max-width: 100%;
    height: 100%;
    height: 100dvh;
    max-height: 100dvh;
    margin: 0;

    border-radius: 0;
  }

  .mail-reading__panel {
    max-height: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;

    overflow-x: hidden;
    overflow-y: auto;

    -webkit-overflow-scrolling: touch;
  }

  .mail-reading__toolbar {
    padding-top: calc(clamp(0.85rem, 2vw, 1.15rem) + env(safe-area-inset-top, 0px));
  }

  .mail-reading__body {
    padding-bottom: calc(clamp(2rem, 5vw, 3rem) + env(safe-area-inset-bottom, 0px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .mail-room-hero__track {
    height: auto;
  }

  .mail-room-hero__sticky {
    position: relative;

    height: auto;
    min-height: 0;
  }

  .mail-room-hero__clip {
    position: relative;

    inset: auto;

    overflow: hidden;
  }

  .mail-room-hero__media {
    position: relative;

    inset: auto;

    transform: none !important;
  }

  .mail-room-hero__photo {
    height: auto;
    max-height: min(52vh, 24rem);

    filter: none !important;
  }

  .mail-room-hero {
    --hero-kicker-opacity: 1;
  }
}

/* --- Mail Room browse (search rail, notation, load more) --- */

.mail-room-field__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(9.5rem, 13.5rem);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.mail-room-rail {
  position: sticky;
  top: calc(var(--site-header-height, 5rem) + clamp(1rem, 3vw, 1.75rem));
}

.mail-browse__search-label {
  display: block;

  margin-bottom: 0.55rem;

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.mail-browse__search-input {
  width: 100%;

  padding: 0.45rem 0 0.55rem;

  border: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.22);
  border-radius: 0;

  background: transparent;

  color: var(--site-text);

  font-family: var(--body-font);
  font-size: clamp(0.88rem, 1.3vw, 0.98rem);

  -webkit-appearance: none;
  appearance: none;
}

.mail-browse__search-input::placeholder {
  color: var(--site-text-muted);
}

.mail-browse__search-input:focus-visible {
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 3px;
}

.mail-browse__search-input::-webkit-search-cancel-button {
  -webkit-appearance: none;
}

.mail-browse__active {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 0.85rem;

  margin: 0.75rem 0 0;

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mail-browse__clear {
  padding: 0;

  border: none;

  background: none;

  color: inherit;

  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  text-decoration: underline;
  text-underline-offset: 0.18em;

  cursor: pointer;
}

.mail-browse__clear:focus-visible {
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 3px;
}

.mail-browse__empty {
  max-width: 34rem;
  margin: 0 0 clamp(2.5rem, 6vw, 4rem);

  font-family: var(--heading-font);
  font-size: clamp(1.25rem, 2.6vw, 1.65rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.05;
  text-transform: uppercase;
}

.mail-browse__more {
  display: block;

  width: 100%;
  max-width: 18rem;
  margin-top: clamp(2rem, 5vw, 3rem);
  padding: 0.7rem 0.85rem;

  border: 1px solid rgba(0, 0, 0, 0.18);

  background: transparent;

  color: var(--site-text);

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-browse__more:focus-visible {
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 3px;
}

.mail-artifact[hidden],
.mail-browse__active[hidden],
.mail-browse__more[hidden],
.mail-browse__empty[hidden] {
  display: none !important;
}

.mail-room-rail .room-discovery {
  margin-top: 1.35rem;
}

.mail-room-rail .room-discovery__label {
  margin: 0 0 0.55rem;

  color: var(--site-text);

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  pointer-events: none;
}

.mail-room-rail .room-discovery__tags {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.mail-room-rail .room-discovery__tag {
  color: var(--site-text-muted);

  font-size: 0.64rem;
  letter-spacing: 0.06em;
  line-height: 1.35;
  text-decoration: none;
  text-transform: uppercase;
}

.mail-room-rail .room-discovery__tag[aria-pressed="true"] {
  color: var(--site-text);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.mail-room-rail .room-discovery__tag:hover {
  color: var(--site-text);
}

.mail-room-rail .room-discovery__tag:hover:not([aria-pressed="true"]) {
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.mail-room-rail .room-discovery__tag:focus-visible {
  color: var(--site-text);
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 3px;
}

.mail-reading__notation {
  margin-top: clamp(1.35rem, 3vw, 1.85rem);
  padding-top: 0.75rem;

  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.mail-reading__notation .room-notation {
  margin: 0;

  color: var(--site-text-muted);

  font-size: 0.64rem;
  line-height: 1.45;
}

.mail-reading__notation .room-notation__label {
  margin-right: 0.45em;

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.mail-reading__notation .room-notation__tag {
  color: inherit;
  text-decoration: none;
}

.mail-reading__notation .room-notation__tag:hover,
.mail-reading__notation .room-notation__tag:focus-visible {
  color: var(--site-text);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

.room-notation__sep {
  opacity: 0.45;
}

.mail-reading__thread {
  margin-top: clamp(1.35rem, 3vw, 1.85rem);
  padding-top: 0.75rem;

  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.mail-reading__thread-summary {
  color: var(--site-text);

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  line-height: 1.2;
  text-transform: uppercase;

  cursor: pointer;
  list-style: none;
}

.mail-reading__thread-summary::-webkit-details-marker {
  display: none;
}

.mail-reading__thread-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;

  max-height: min(12rem, 40vh);
  margin: 0.75rem 0 0;
  padding: 0;

  overflow-y: auto;
  list-style: none;
}

.mail-reading__thread-item {
  margin: 0;
}

.mail-reading__thread-member {
  display: block;

  width: 100%;
  margin: 0;
  padding: 0.35rem 0;

  border: none;

  background: transparent;

  color: var(--site-text-muted);

  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 0.64rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.35;
  text-align: left;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-reading__thread-date {
  display: block;

  margin-top: 0.15rem;

  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mail-reading__thread-member:hover,
.mail-reading__thread-member:focus-visible {
  color: var(--site-text);
  outline: 2px solid rgba(0, 0, 0, 0.35);
  outline-offset: 3px;
}

@media (max-width: 56rem) {
  .mail-room-field__layout {
    display: flex;
    flex-direction: column;
  }

  .mail-room-rail {
    position: static;
    order: -1;

    max-width: 34rem;
    max-height: none;
    margin-bottom: clamp(2.5rem, 6vw, 4rem);
    overflow: visible;
  }

  .mail-room-rail .room-discovery__tags {
    flex-flow: row wrap;
    gap: 0.35rem 0.75rem;
  }
}

@media (max-width: 25.125rem) {
  .mail-browse__search-label,
  .mail-browse__active,
  .mail-browse__more {
    font-size: 0.6rem;
  }

  .mail-reading__notation .room-notation {
    font-size: 0.58rem;
  }
}

/* --- Submission dialog (Slice 1: Steps 1–6) ---------------- */

.mail-submit {
  width: min(calc(100% - 2rem), 52rem);
  max-width: 100%;
  max-height: calc(100vh - 2rem);
  margin: auto;
  padding: 0;

  border: none;
  border-radius: 0.35rem;

  background: var(--site-surface);

  color: var(--site-text);

  overflow: hidden;
}

.mail-submit::backdrop {
  background: rgba(255, 255, 255, 0.72);

  backdrop-filter: blur(6px);
}

.mail-submit__panel {
  display: flex;
  flex-direction: column;

  min-width: 0;
  max-height: calc(100vh - 2rem);
}

.mail-submit__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;

  padding: clamp(0.85rem, 2vw, 1.15rem) clamp(1rem, 3vw, 1.5rem);

  border-bottom: 1px solid rgba(17, 17, 17, 0.1);
}

.mail-submit__return,
.mail-submit__dev-preview {
  margin: 0;
  padding: 0;

  border: none;

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(0.85rem, 1.4vw, 0.95rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-transform: uppercase;
}

.mail-submit__return {
  cursor: pointer;
}

.mail-submit__dev-preview {
  margin-left: auto;

  color: rgba(17, 17, 17, 0.62);

  font-family: var(--body-font);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  line-height: 1.35;
  text-transform: none;
  text-decoration: underline;
  text-underline-offset: 0.15em;

  cursor: pointer;
}

.mail-submit__return:focus-visible,
.mail-submit__dev-preview:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

.mail-submit__body {
  min-width: 0;
  overflow-x: hidden;
  overflow-y: auto;

  padding: clamp(1.25rem, 3vw, 2rem) clamp(1rem, 3vw, 1.75rem)
    clamp(2rem, 5vw, 3rem);
}

.mail-submit__step {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.35rem);
}

.mail-submit__step-title {
  margin: 0;

  font-family: var(--heading-font);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 1;
  text-transform: uppercase;
}

.mail-submit__note {
  display: grid;
  gap: 0.65rem;

  padding: 0.85rem 0 0;

  font-size: clamp(0.95rem, 1.2vw, 1.02rem);
  line-height: 1.6;
}

.mail-submit__note p {
  margin: 0;
}

.mail-submit__helper {
  margin: 0;

  color: rgba(17, 17, 17, 0.62);

  font-size: clamp(0.88rem, 1.1vw, 0.95rem);
  line-height: 1.55;
}

.mail-submit__label {
  font-family: var(--heading-font);
  font-size: clamp(0.9rem, 1.2vw, 1rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-transform: uppercase;
}

.mail-submit__input {
  width: 100%;
  margin: 0;
  padding: 0.65rem 0;

  border: none;
  border-bottom: 1px solid rgba(17, 17, 17, 0.16);
  border-radius: 0;

  background: transparent;

  color: var(--site-text);

  font-family: var(--body-font);
  font-size: clamp(1rem, 1.2vw, 1.06rem);
  line-height: 1.55;
}

.mail-submit__textarea {
  width: 100%;
  margin: 0;

  color: var(--site-text);

  font-family: var(--body-font);
  font-size: clamp(1rem, 1.2vw, 1.06rem);
  line-height: 1.55;

  resize: vertical;
}

.mail-submit__textarea--letter {
  min-height: 16rem;
  padding: clamp(1rem, 2.5vw, 1.35rem);

  border: 1px solid #111111;
  border-radius: 0;

  background: #ffffff;
}

.mail-submit__textarea--letter::placeholder {
  color: rgba(17, 17, 17, 0.42);
}

.mail-submit__input:focus {
  outline: none;

  border-bottom-color: var(--site-text);
}

.mail-submit__textarea--letter:focus {
  outline: none;

  border-color: #111111;
}

.mail-submit__input:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 3px;
}

.mail-submit__textarea--letter:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 3px;
}

.mail-submit__crisis-note {
  margin: 0.5rem 0 0;

  color: rgba(17, 17, 17, 0.52);

  font-size: clamp(0.78rem, 1vw, 0.84rem);
  line-height: 1.5;
}

.mail-submit__check {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;

  font-size: clamp(0.95rem, 1.15vw, 1.02rem);
  line-height: 1.55;
}

.mail-submit__check-input {
  flex-shrink: 0;

  width: 1.1rem;
  height: 1.1rem;
  margin-top: 0.2rem;
}

.mail-submit__question {
  margin: 0;
  padding: 0;

  border: none;
}

.mail-submit__question-prompt {
  margin: 0 0 0.65rem;

  font-family: var(--body-font);
  font-size: clamp(0.95rem, 1.15vw, 1.02rem);
  font-weight: 500;
  line-height: 1.5;
}

.mail-submit__choice {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;

  margin: 0.45rem 0 0;
  padding: 0;

  font-size: clamp(0.92rem, 1.1vw, 0.98rem);
  line-height: 1.5;
}

.mail-submit__choice input {
  flex-shrink: 0;

  margin-top: 0.25rem;
}

.mail-submit__permission {
  margin: 0;
  padding: 0;

  border: none;
}

.mail-submit__permission-option {
  display: grid;
  gap: 0.25rem;

  margin: 0 0 1rem;
  padding: 0 0 1rem;

  border-bottom: 1px solid rgba(17, 17, 17, 0.08);
}

.mail-submit__permission-option:last-child {
  margin-bottom: 0;
  padding-bottom: 0;

  border-bottom: none;
}

.mail-submit__permission-option input {
  margin-right: 0.35rem;
}

.mail-submit__permission-title {
  font-family: var(--heading-font);
  font-size: clamp(0.95rem, 1.2vw, 1.05rem);
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-transform: uppercase;
}

.mail-submit__permission-subline {
  color: rgba(17, 17, 17, 0.72);

  font-size: clamp(0.92rem, 1.1vw, 0.98rem);
  line-height: 1.45;
}

.mail-submit__permission-detail {
  color: rgba(17, 17, 17, 0.58);

  font-size: clamp(0.85rem, 1vw, 0.92rem);
  line-height: 1.5;
}

.mail-submit__credit--hidden {
  display: none;
}

.mail-submit__review {
  display: grid;
  gap: 0.35rem 1rem;
  grid-template-columns: minmax(6rem, 8rem) 1fr;

  margin: 0;
}

.mail-submit__review dt {
  margin: 0;

  color: rgba(17, 17, 17, 0.58);

  font-family: var(--heading-font);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.3;
  text-transform: uppercase;
}

.mail-submit__review dd {
  margin: 0 0 0.75rem;

  font-size: clamp(0.92rem, 1.1vw, 0.98rem);
  line-height: 1.55;
}

.mail-submit__review-truncated {
  color: rgba(17, 17, 17, 0.58);
}

.mail-submit__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  align-items: center;

  margin-top: 0.5rem;
}

.mail-submit__nav--send {
  justify-content: space-between;
}

.mail-submit__back,
.mail-submit__continue,
.mail-submit__send {
  min-height: 2.75rem;
  margin: 0;
  padding: 0.65rem 0;

  border: none;
  border-top: 1px solid rgba(17, 17, 17, 0.22);

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-submit__continue:disabled,
.mail-submit__continue[aria-disabled="true"] {
  cursor: not-allowed;

  opacity: 0.45;
}

.mail-submit__back:focus-visible,
.mail-submit__continue:focus-visible,
.mail-submit__send:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

.mail-submit__error {
  margin: 0;

  color: #8b1a1a;

  font-size: 0.92rem;
  line-height: 1.45;
}

.mail-submit__status {
  margin: 0.75rem 0 0;

  color: rgba(17, 17, 17, 0.72);

  font-size: clamp(0.95rem, 1.15vw, 1.02rem);
  line-height: 1.5;
}

/* Development-only arrival preview (not part of submission flow) */

.mail-submit-dev-preview {
  width: min(calc(100% - 2rem), 40rem);
  max-width: 100%;
  margin: auto;
  padding: 0;

  border: none;
  border-radius: 0.35rem;

  background: var(--yellow);

  color: var(--site-text);
}

.mail-submit-dev-preview::backdrop {
  background: rgba(255, 255, 255, 0.82);

  backdrop-filter: blur(6px);
}

.mail-submit-dev-preview__panel {
  display: grid;
  gap: 1rem;

  padding: clamp(1.5rem, 4vw, 2.25rem);
}

.mail-submit-dev-preview__banner {
  margin: 0;

  color: #8b1a1a;

  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.45;
}

.mail-submit-dev-preview__title {
  margin: 0;

  font-family: var(--heading-font);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 0.95;
  text-transform: uppercase;
}

.mail-submit-dev-preview__copy {
  margin: 0;

  font-size: clamp(1rem, 1.4vw, 1.08rem);
  line-height: 1.65;
}

.mail-submit-dev-preview__ref {
  margin: 0;

  font-family: "Roboto Mono", monospace;
  font-size: 0.88rem;
  line-height: 1.5;
}

.mail-submit-dev-preview__ref-label {
  display: block;

  margin-bottom: 0.25rem;

  color: rgba(17, 17, 17, 0.58);

  font-family: var(--heading-font);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.mail-submit-dev-preview--questionnaire {
  width: min(calc(100% - 2rem), 44rem);
  max-height: min(92vh, 52rem);
}

.mail-submit-dev-preview__panel--scroll {
  overflow-y: auto;
  max-height: min(92vh, 52rem);
}

.mail-submit-dev-preview__invite {
  margin: 1.75rem 0 0;

  font-family: var(--heading-font);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-transform: uppercase;
}

.mail-submit-dev-preview__questions {
  display: grid;
  gap: 1.15rem;
}

.mail-submit-dev-preview__questions .mail-submit__question {
  padding-bottom: 0.85rem;

  border-bottom: 1px solid rgba(17, 17, 17, 0.14);
}

.mail-submit-dev-preview__questions .mail-submit__question:last-child {
  padding-bottom: 0;

  border-bottom: none;
}

.mail-submit-dev-preview__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  align-items: center;
}

.mail-submit-dev-preview__action {
  min-height: 2.75rem;
  margin: 0;
  padding: 0.65rem 0;

  border: none;
  border-top: 1px solid rgba(17, 17, 17, 0.22);

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-submit-dev-preview__action--primary {
  border-top-color: rgba(17, 17, 17, 0.4);

  font-weight: 600;
}

.mail-submit-dev-preview__action:disabled,
.mail-submit-dev-preview__close:disabled {
  opacity: 0.45;

  cursor: not-allowed;
}

.mail-submit-dev-preview__action:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

.mail-submit-dev-preview__close {
  justify-self: start;

  min-height: 2.75rem;
  margin: 0;
  padding: 0.65rem 0;

  border: none;
  border-top: 1px solid rgba(17, 17, 17, 0.22);

  background: transparent;

  color: var(--site-text);

  font-family: var(--heading-font);
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;

  cursor: pointer;
}

.mail-submit-dev-preview__close:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 4px;
}

@media (max-width: 40rem) {
  .mail-submit {
    inset: 0;

    width: 100%;
    max-width: 100%;
    height: 100%;
    height: 100dvh;
    max-height: 100dvh;
    margin: 0;

    border-radius: 0;
  }

  .mail-submit__panel {
    max-height: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;
  }

  .mail-submit__review {
    grid-template-columns: 1fr;
  }

  .mail-submit__review dt {
    margin-top: 0.35rem;
  }

  .mail-submit__dev-preview {
    width: 100%;
    max-width: 100%;
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mail-submit__textarea,
  .mail-submit__input {
    transition: none;
  }
}