/* TCP-specific layout. Colors and typography come from the blog theme. */
#tcp-close-note {
  --act: var(--link-color);
  --pas: var(--notice-tip-label-color);

  .player {
    overflow: hidden;
    border: 1px solid var(--main-border-color);
    border-radius: 12px;
    background: var(--main-bg);
  }

  .heads {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-bottom: 1px solid var(--main-border-color);
    background: var(--journal-surface);
  }

  .head {
    min-width: 0;
    padding: 1.25rem;
  }

  .head + .head {
    border-left: 1px solid var(--main-border-color);
  }

  .who {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--heading-color);
    font-size: 0.9rem;
    font-weight: 650;
  }

  .bar {
    width: 3px;
    height: 1rem;
    border-radius: 2px;
    background: var(--act);
  }

  .p .bar {
    background: var(--pas);
  }

  .role, .substate, .packet-meta {
    color: var(--text-muted-color);
    font-size: 0.75rem;
    line-height: 1.7;
  }

  .state {
    margin-top: 1rem;
    color: var(--act);
    font-family: var(--bs-font-monospace);
    font-size: clamp(0.8rem, 2.5vw, 1rem);
    font-weight: 650;
    overflow-wrap: anywhere;
  }

  .p .state {
    color: var(--pas);
  }

  .state.closed {
    color: var(--text-muted-color);
  }

  .state.changed {
    animation: tcp-close-state 250ms ease;
  }

  .substate {
    min-height: 1.7em;
    margin-top: 0.25rem;
  }

  .tape {
    padding: 0.5rem 1.25rem;
  }

  .pkt {
    display: grid;
    grid-template-columns: 1.5rem minmax(0, 1fr);
    gap: 0.75rem;
    padding: 1rem 0;
    color: var(--text-muted-color);
  }

  .pkt + .pkt {
    border-top: 1px solid var(--main-border-color);
  }

  .num {
    color: var(--text-muted-color);
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
  }

  .pkt.active .num {
    color: var(--link-color);
    font-weight: 700;
  }

  .seg {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem;
    font-family: var(--bs-font-monospace);
    font-size: 0.85rem;
    font-weight: 600;
  }

  .track {
    position: relative;
    height: 0.3rem;
    margin-block: 0.65rem;
    overflow: hidden;
    border-radius: 3px;
    background: var(--journal-surface);
  }

  .a2p .seg, .a2p .track {
    color: var(--act);
  }

  .p2a .seg, .p2a .track {
    color: var(--pas);
  }

  .track::after {
    position: absolute;
    inset-block: 0;
    width: 38%;
    border-radius: inherit;
    background: currentcolor;
    content: '';
    opacity: 0;
  }

  .pkt.active .track::after {
    opacity: 0.7;
    animation: tcp-close-send 850ms ease forwards;
  }

  .p2a.active .track::after {
    animation-direction: reverse;
  }

  .pkt.done .track::after {
    width: 100%;
    opacity: 0.3;
  }

  .exp {
    font-size: 0.9rem;
    line-height: 1.8;
  }

  .pkt.active .exp {
    color: var(--text-color);
  }

  .lane {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--main-border-color);
    background: var(--journal-surface);
    color: var(--text-muted-color);
    font-size: 0.85rem;
    line-height: 1.8;
  }

  .ic {
    color: var(--link-color);
    font-weight: 650;
  }

  .cnt {
    margin-left: auto;
    color: var(--text-muted-color);
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
  }
}

@keyframes tcp-close-state {
  from { transform: translateY(-3px); }
  to { transform: none; }
}

@keyframes tcp-close-send {
  from { left: -40%; }
  to { left: 102%; }
}

@media (width <= 480px) {
  #tcp-close-note .head { padding: 1rem 0.75rem; }
  #tcp-close-note .tape { padding-inline: 0.75rem; }
  #tcp-close-note .lane { padding: 0.85rem; }
}

@media (prefers-reduced-motion: reduce) {
  #tcp-close-note .state.changed,
  #tcp-close-note .pkt.active .track::after {
    animation: none;
  }

  #tcp-close-note .pkt.active .track::after {
    inset-inline-start: 0;
    width: 100%;
  }
}