/* ============================================================
   CONTACT — Chapter 05
   A folded letter, signatures, copy-to-clipboard, the finale.
   ============================================================ */

/* ---------- LETTER CARD ---------- */
.letter { padding: clamp(3rem, 6vw, 5rem) 0 2rem; }
.letter__card {
  position: relative;
  background: var(--cream-bg);
  padding: clamp(2.5rem, 5vw, 4rem) clamp(2rem, 4vw, 3.5rem);
  max-width: 800px;
  margin: 0 auto;
  border: 1px solid var(--paper-beige);
  box-shadow:
    0 0 0 6px var(--cream-bg),
    0 0 0 7px var(--paper-beige);
}
.letter__card::before {
  content: "";
  position: absolute;
  inset: 1rem;
  border: 1px dashed var(--paper-beige);
  pointer-events: none;
}
/* Decorative corner marks */
.letter__corner {
  position: absolute;
  width: 22px;
  height: 22px;
}
.letter__corner::before,
.letter__corner::after {
  content: "";
  position: absolute;
  background: var(--red-accent);
}
.letter__corner--tl { top: 1rem; left: 1rem; }
.letter__corner--tl::before { top: 0; left: 0; width: 22px; height: 1px; }
.letter__corner--tl::after  { top: 0; left: 0; width: 1px; height: 22px; }
.letter__corner--tr { top: 1rem; right: 1rem; }
.letter__corner--tr::before { top: 0; right: 0; width: 22px; height: 1px; }
.letter__corner--tr::after  { top: 0; right: 0; width: 1px; height: 22px; }
.letter__corner--bl { bottom: 1rem; left: 1rem; }
.letter__corner--bl::before { bottom: 0; left: 0; width: 22px; height: 1px; }
.letter__corner--bl::after  { bottom: 0; left: 0; width: 1px; height: 22px; }
.letter__corner--br { bottom: 1rem; right: 1rem; }
.letter__corner--br::before { bottom: 0; right: 0; width: 22px; height: 1px; }
.letter__corner--br::after  { bottom: 0; right: 0; width: 1px; height: 22px; }

.letter__head {
  text-align: center;
  margin-bottom: 2rem;
}
.letter__title {
  font-family: var(--font-serif-cn);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--green-deep);
  margin-top: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.06em;
}

.letter__body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.letter__row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0.6rem;
  border-bottom: 1px dashed var(--cream-deep);
}
.letter__row:last-child { border-bottom: 0; }
.letter__label {
  color: var(--red-accent);
  letter-spacing: 0.3em;
  font-size: 0.72rem;
}
.letter__value {
  font-family: var(--font-serif-en), var(--font-sans-cn);
  font-size: 1.05rem;
  color: var(--green-deep);
  letter-spacing: 0.04em;
}
a.letter__value { transition: color var(--motion); }
a.letter__value:hover { color: var(--red-accent); }
.letter__copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--paper-beige);
  color: var(--ink-mute);
  background: transparent;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--motion);
}
.letter__copy:hover { color: var(--red-accent); border-color: var(--red-accent); }
.letter__copy.is-copied {
  background: var(--red-accent);
  color: var(--cream-bg);
  border-color: var(--red-accent);
}
@media (max-width: 640px) {
  .letter__row { grid-template-columns: 1fr; gap: 0.4rem; }
}

.letter__divider {
  height: 1px;
  background: var(--cream-deep);
  margin: 2rem 0;
}

.letter__cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.letter__signature {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}
.letter__sign-name {
  font-family: var(--font-serif-cn);
  font-size: 1.7rem;
  color: var(--green-deep);
  letter-spacing: 0.18em;
  font-weight: 500;
}

/* ---------- OTHER CHANNELS ---------- */
.channels { padding: clamp(4rem, 7vw, 6rem) 0; }
.channels__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.channel {
  background: var(--cream-warm);
  padding: 1.6rem 1.4rem;
  border: 1px solid var(--paper-beige);
  transition: all var(--motion);
}
.channel:hover {
  background: var(--cream-bg);
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 var(--green-vintage);
}
.channel .mono {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  display: inline-block;
  margin-bottom: 0.6rem;
}
.channel h3 {
  font-family: var(--font-serif-cn);
  font-size: 1.15rem;
  color: var(--green-deep);
  margin-bottom: 0.6rem;
  letter-spacing: 0.04em;
  font-weight: 500;
}
.channel p {
  font-size: 0.86rem;
  color: var(--ink-soft);
  margin-bottom: 1rem;
  line-height: 1.8;
}
@media (max-width: 980px) {
  .channels__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .channels__grid { grid-template-columns: 1fr; }
}

/* ---------- FINALE ---------- */
.finale {
  padding: clamp(4rem, 9vw, 7rem) 0 clamp(6rem, 10vw, 10rem);
  text-align: center;
}
.finale__quote {
  font-style: italic;
  font-size: clamp(2rem, 4vw, 3.2rem);
  color: var(--green-deep);
  margin: 1rem 0 2rem;
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.finale__quote-cn {
  font-size: 1.05rem;
  color: var(--ink-soft);
  line-height: 2;
  max-width: 32rem;
  margin: 0 auto 3rem;
}
.finale__mark {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.finale__thread {
  display: inline-block;
  width: 80px;
  height: 1px;
  background: repeating-linear-gradient(
    90deg,
    var(--red-accent) 0,
    var(--red-accent) 4px,
    transparent 4px,
    transparent 9px
  );
}
.finale__knot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--red-accent);
  border-radius: 50%;
  position: relative;
}
.finale__knot::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--red-accent);
}