.chat-section {
  padding-top: 42px;
}

.chat-layout {
  display: grid;
  gap: 22px;
}

.chat-layout.has-thread-list {
  grid-template-columns: minmax(250px, 0.36fr) minmax(0, 1fr);
  align-items: start;
}

.chat-thread-list,
.chat-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.chat-thread-list {
  position: sticky;
  top: 98px;
}

.chat-thread-list h3 {
  margin-bottom: 14px;
  font-size: 1.1rem;
}

.chat-thread-items {
  display: grid;
  gap: 8px;
}

.chat-thread-link {
  position: relative;
  display: grid;
  gap: 3px;
  padding: 12px 42px 12px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: #f8fafc;
  text-decoration: none;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.chat-thread-link:hover,
.chat-thread-link.active {
  transform: translateY(-1px);
  border-color: rgba(29, 78, 216, 0.28);
  background: rgba(29, 78, 216, 0.07);
}

.chat-thread-link span {
  font-weight: 900;
}

.chat-thread-link small,
.chat-muted {
  color: var(--muted);
}

.chat-thread-link strong {
  position: absolute;
  top: 12px;
  right: 12px;
  min-width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: #ffffff;
  background: var(--accent);
  font-size: 0.78rem;
}

.chat-panel-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.chat-panel-header h3 {
  margin-bottom: 4px;
  font-size: 1.35rem;
}

.chat-panel-header span,
.chat-panel-header small {
  color: var(--muted);
  font-weight: 800;
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: min(58vh, 540px);
  min-height: 360px;
  margin: 18px 0;
  padding: 16px;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(29, 78, 216, 0.045), rgba(15, 118, 110, 0.025)),
    #f8fafc;
}

.chat-message {
  display: flex;
}

.chat-message.is-mine {
  justify-content: flex-end;
}

.chat-message > div {
  width: min(78%, 620px);
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(23, 32, 51, 0.06);
}

.chat-message.is-mine > div {
  color: #ffffff;
  border-color: rgba(29, 78, 216, 0.2);
  background: var(--accent);
}

.chat-message span {
  display: block;
  margin-bottom: 5px;
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.chat-message p {
  margin-bottom: 7px;
  line-height: 1.55;
}

.chat-message small {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.chat-message.is-mine small {
  color: rgba(255, 255, 255, 0.78);
}

.chat-empty {
  margin: auto;
  max-width: 420px;
  text-align: center;
}

.chat-empty p {
  color: var(--muted);
}

.chat-compose {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.chat-compose textarea {
  min-height: 82px;
  resize: vertical;
}

@media (max-width: 991px) {
  .chat-layout.has-thread-list {
    grid-template-columns: 1fr;
  }

  .chat-thread-list {
    position: static;
  }
}

@media (max-width: 575px) {
  .chat-compose {
    grid-template-columns: 1fr;
  }

  .chat-message > div {
    width: 92%;
  }
}