/* 訊號鏈元件樣式。只用變數，兩種主題都能用。 */

.chain {
  display: grid; grid-template-columns: 1fr minmax(36px, 84px) 1fr minmax(36px, 84px) 1fr; align-items: stretch; gap: 0;
}
.chain-node {
  position: relative; text-align: left; cursor: default; display: grid; gap: 4px; align-content: start;
  padding: 18px 18px 16px; border-radius: var(--radius); border: 1px solid var(--line-2);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  transition: border-color .3s, box-shadow .3s, filter .4s, background .3s; overflow: hidden;
}
.chain-node::before { /* 角落的括號 */
  content: ""; position: absolute; inset: 8px; border-radius: 10px; pointer-events: none;
  background:
    linear-gradient(var(--h), var(--h)) top left / 14px 1px no-repeat,
    linear-gradient(var(--h), var(--h)) top left / 1px 14px no-repeat,
    linear-gradient(var(--h), var(--h)) bottom right / 14px 1px no-repeat,
    linear-gradient(var(--h), var(--h)) bottom right / 1px 14px no-repeat;
  opacity: .55; transition: opacity .3s;
}
.chain-node:hover { border-color: color-mix(in srgb, var(--h) 55%, transparent); }
.chain-node:hover::before { opacity: 1; }
.chain-ring {
  position: relative; width: 54px; height: 54px; border-radius: 16px; display: grid; place-items: center; color: var(--h);
  background: var(--hs); border: 1px solid color-mix(in srgb, var(--h) 45%, transparent);
  box-shadow: 0 0 calc(24px * var(--glow)) -6px var(--h), inset 0 0 calc(18px * var(--glow)) -8px var(--h); margin-bottom: 8px;
}
.chain-lockbadge {
  position: absolute; right: -7px; bottom: -7px; width: 22px; height: 22px; border-radius: 50%; display: none; place-items: center;
  background: var(--badge-bg); color: var(--muted); border: 1px solid var(--line-2);
}
.chain-name { font-weight: 700; font-size: 18px; letter-spacing: .01em; }
.chain-system { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .14em; }
.chain-state { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; min-height: 26px; }
.chain-note { font-size: 13px; color: var(--muted); margin-top: 2px; min-height: 20px; }

.chain-node.is-locked {
  filter: grayscale(.85);
  opacity: .78;
  background: repeating-linear-gradient(135deg, var(--tint-2) 0 8px, transparent 8px 16px), var(--panel);
}
.chain-node.is-locked .chain-ring { box-shadow: none; }
.chain-node.is-locked .chain-lockbadge { display: grid; }
.chain-node.is-offline { border-color: color-mix(in srgb, var(--live) 55%, transparent); }
.chain-node.is-degraded { border-color: color-mix(in srgb, var(--amber) 55%, transparent); }

/* 連線與封包 */
.chain-link { position: relative; align-self: center; height: 2px; }
.chain-wire { position: absolute; inset: 0; border-radius: 2px; background: linear-gradient(90deg, transparent, var(--wire), transparent); }
.chain-wire::after { /* 緩慢流動的虛線，代表線路是通的 */
  content: ""; position: absolute; inset: -1px 0; border-radius: 3px;
  background: repeating-linear-gradient(90deg, color-mix(in srgb, var(--cyan) 70%, transparent) 0 6px, transparent 6px 22px);
  mask-image: linear-gradient(90deg, transparent, #000 25%, #000 75%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 25%, #000 75%, transparent);
  animation: wire-flow 1.4s linear infinite; opacity: .55;
}
@keyframes wire-flow { to { background-position: 22px 0; } }
.chain-packet {
  position: absolute; left: -6px; top: -5px; width: 12px; height: 12px; border-radius: 50%; opacity: 0;
  background: radial-gradient(circle, #fff 0 25%, var(--cyan) 60%, transparent 72%);
  box-shadow: 0 0 calc(16px * var(--glow) + 3px) 3px color-mix(in srgb, var(--cyan) 80%, transparent);
}

/* 脈衝：每一步在節點上留下的回饋 */
.chain-node.pulse-ok { animation: pulse-ok .9s ease-out; }
.chain-node.pulse-locked { animation: pulse-locked .9s ease-out; }
.chain-node.pulse-error { animation: pulse-locked .9s ease-out; }
.chain-node.pulse-skipped { animation: pulse-skip .6s ease-out; }
@keyframes pulse-ok {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--h) 70%, transparent); border-color: var(--h); }
  100% { box-shadow: 0 0 0 22px transparent; }
}
@keyframes pulse-locked {
  0%, 100% { transform: translateX(0); }
  15% { transform: translateX(-6px); } 35% { transform: translateX(5px); } 55% { transform: translateX(-3px); } 75% { transform: translateX(2px); }
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--live) 60%, transparent); border-color: var(--live); }
  100% { box-shadow: 0 0 0 20px transparent; }
}
@keyframes pulse-skip { 0% { opacity: .5; } 100% { opacity: 1; } }

@media (max-width: 760px) {
  .chain { grid-template-columns: 1fr; }
  .chain-link { width: 2px; height: 36px; justify-self: center; }
  .chain-wire { background: linear-gradient(180deg, transparent, var(--wire), transparent); }
  .chain-wire::after { background: repeating-linear-gradient(180deg, color-mix(in srgb, var(--cyan) 70%, transparent) 0 6px, transparent 6px 22px); animation-name: wire-flow-y; }
  @keyframes wire-flow-y { to { background-position: 0 22px; } }
  .chain-packet { left: -5px; top: -6px; }
}

/* 步驟紀錄 */
.steplog { display: grid; gap: 2px; max-height: 340px; overflow: auto; padding-right: 4px; scrollbar-width: thin; scrollbar-color: var(--line-2) transparent; }
.steprow {
  display: grid; grid-template-columns: 28px 1fr auto auto; gap: 12px; align-items: center;
  padding: 10px 12px; border-radius: 10px; border: 1px solid transparent; animation: row-in .35s ease-out;
}
@keyframes row-in { from { opacity: 0; transform: translateY(6px); } }
.steprow.is-ok { background: color-mix(in srgb, var(--lime) 7%, transparent); }
.steprow.is-locked { background: var(--live-soft); border-color: color-mix(in srgb, var(--live) 32%, transparent); }
.steprow.is-skipped { opacity: .55; }
.steprow.is-error { background: var(--amber-soft); border-color: color-mix(in srgb, var(--amber) 32%, transparent); }
.step-n { color: var(--faint); font-size: 12px; }
.step-main { display: grid; gap: 1px; min-width: 0; }
.step-main b { font-weight: 600; font-size: 15px; }
.step-main em { font-style: normal; font-size: 12px; color: var(--muted); }
.step-main small { color: var(--warn); font-size: 12.5px; }
.step-ms { font-size: 12px; color: var(--faint); }