.mailbox-page {
  color: var(--white-warm);
  background:
    linear-gradient(180deg, #11151a 0%, #0d1117 46%, #151117 100%);
}

.mailbox-shell {
  min-height: 100dvh;
  padding: clamp(1rem, 4vw, 3rem);
}

.mailbox-header,
.letter-grid,
.letter-empty {
  width: min(100%, 1180px);
  margin-inline: auto;
}

.mailbox-header__main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  align-items: end;
}

.mailbox-header h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 8vw, 4.8rem);
  font-weight: 600;
  line-height: 1.14;
  text-wrap: balance;
}

.mailbox-stats,
.mailbox-status {
  margin: 0.85rem 0 0;
  color: rgba(245, 240, 235, 0.62);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
}

.letter-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.35rem;
}

.letter-filters button,
.mailbox-primary,
.mailbox-secondary,
.mailbox-danger,
.mailbox-icon-button {
  min-height: 2.75rem;
  border-radius: 8px;
  cursor: pointer;
  transition:
    opacity 160ms ease-out,
    transform 160ms ease-out,
    background 160ms ease-out;
}

.letter-filters button {
  border: 1px solid rgba(245, 240, 235, 0.16);
  padding: 0 0.95rem;
  color: rgba(245, 240, 235, 0.72);
  background: rgba(245, 240, 235, 0.05);
}

.letter-filters button.is-active {
  color: #11151a;
  background: var(--white-warm);
}

.mailbox-primary {
  border: 1px solid rgba(221, 182, 105, 0.76);
  padding: 0 1rem;
  color: #17120a;
  background: #ddb669;
}

.mailbox-secondary {
  border: 1px solid rgba(245, 240, 235, 0.16);
  padding: 0 1rem;
  color: var(--white-warm);
  background: rgba(245, 240, 235, 0.07);
}

.mailbox-danger {
  border: 1px solid rgba(192, 57, 43, 0.62);
  padding: 0 1rem;
  color: var(--white-warm);
  background: rgba(192, 57, 43, 0.22);
}

.mailbox-icon-button {
  width: 2.75rem;
  border: 1px solid rgba(245, 240, 235, 0.16);
  color: var(--white-warm);
  background: rgba(245, 240, 235, 0.06);
  font-size: 1.35rem;
  line-height: 1;
}

.letter-filters button:hover,
.mailbox-primary:hover,
.mailbox-secondary:hover,
.mailbox-danger:hover,
.mailbox-icon-button:hover {
  transform: translateY(-1px);
}

.letter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.4rem);
}

.letter-card {
  min-width: 0;
  display: grid;
  gap: 1rem;
  padding: clamp(1rem, 3vw, 1.2rem);
  border: 1px solid rgba(245, 240, 235, 0.14);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(245, 240, 235, 0.08), rgba(245, 240, 235, 0.03)),
    rgba(17, 21, 26, 0.84);
}

.letter-card.is-locked {
  border-style: dashed;
  background:
    linear-gradient(135deg, rgba(221, 182, 105, 0.08), rgba(245, 240, 235, 0.025)),
    rgba(17, 21, 26, 0.84);
}

.letter-card__top {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  justify-content: space-between;
}

.letter-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.85rem;
  padding: 0 0.62rem;
  border: 1px solid rgba(245, 240, 235, 0.14);
  border-radius: 999px;
  color: rgba(245, 240, 235, 0.76);
  font-size: 0.78rem;
}

.letter-meta {
  margin: 0;
  color: rgba(245, 240, 235, 0.52);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.letter-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 5vw, 1.8rem);
  line-height: 1.3;
  text-wrap: balance;
}

.letter-content {
  margin: 0;
  color: rgba(245, 240, 235, 0.82);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  text-wrap: pretty;
}

.letter-lock {
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem;
  border: 1px solid rgba(221, 182, 105, 0.25);
  border-radius: 8px;
  color: rgba(245, 240, 235, 0.76);
  background: rgba(221, 182, 105, 0.08);
}

.letter-lock b {
  color: #ddb669;
  font-weight: 600;
}

.letter-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: flex-end;
}

.letter-editor {
  position: fixed;
  z-index: var(--z-toast);
  inset: 0;
  display: grid;
  justify-items: end;
  padding: max(0.75rem, env(safe-area-inset-top)) max(0.75rem, env(safe-area-inset-right))
    max(0.75rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-left));
  background: rgba(8, 10, 14, 0.72);
  overflow: auto;
}

.letter-form {
  width: min(100%, 42rem);
  align-self: start;
  padding: clamp(1rem, 4vw, 1.35rem);
  border: 1px solid rgba(245, 240, 235, 0.16);
  border-radius: 8px;
  background: #151922;
}

.letter-form__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.letter-form h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.7rem;
}

.letter-form label {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.8rem;
  color: rgba(245, 240, 235, 0.72);
  font-size: 0.86rem;
}

.letter-form__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0 0.75rem;
}

.letter-form input,
.letter-form select,
.letter-form textarea {
  width: 100%;
  border: 1px solid rgba(245, 240, 235, 0.16);
  border-radius: 8px;
  padding: 0.7rem 0.8rem;
  color: var(--white-warm);
  background: rgba(15, 15, 35, 0.5);
}

.letter-form textarea {
  resize: vertical;
}

.letter-form textarea[aria-invalid="true"] {
  border-color: rgba(192, 57, 43, 0.78);
}

.letter-help {
  margin: 0.45rem 0 0;
  color: rgba(245, 240, 235, 0.52);
  font-size: 0.82rem;
}

.letter-form__error {
  min-height: 1.5rem;
  margin: 0.8rem 0 0;
  color: #e6b0a6;
  font-size: 0.86rem;
}

.letter-form__actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  margin-top: 1rem;
}

.letter-empty {
  margin-top: clamp(1.5rem, 4vw, 2.4rem);
  padding: 1.2rem;
  border: 1px solid rgba(245, 240, 235, 0.14);
  border-radius: 8px;
  background: rgba(245, 240, 235, 0.05);
}

.letter-empty h2,
.letter-empty p {
  margin: 0;
}

.letter-empty h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
}

.letter-empty p {
  margin-top: 0.45rem;
  color: rgba(245, 240, 235, 0.62);
}

.mailbox-toast {
  position: fixed;
  z-index: var(--z-toast);
  inset-inline: 1rem;
  inset-block-end: max(1rem, env(safe-area-inset-bottom));
  max-width: 28rem;
  margin-inline: auto;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(245, 240, 235, 0.16);
  border-radius: 8px;
  color: var(--white-warm);
  background: rgba(15, 15, 35, 0.96);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition:
    opacity 180ms ease-out,
    transform 180ms ease-out;
}

.mailbox-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 700px) {
  .mailbox-header__main {
    grid-template-columns: minmax(0, 1fr) auto;
  }

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

@media (min-width: 860px) {
  .letter-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .letter-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .letter-filters button,
  .mailbox-primary,
  .mailbox-secondary,
  .mailbox-danger,
  .mailbox-icon-button,
  .mailbox-toast {
    transition-duration: 0.001ms !important;
  }
}