/* 同步协议动画：沿用产品主页的色板，只加这一页需要的样式。 */
.zsp-hero {
  padding-block: 72px 24px;
}
.zsp-hero h1 {
  margin: 8px 0 16px;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.zsp-hero .intro {
  margin: 0;
  max-width: 46rem;
  color: var(--muted);
}

.zsp {
  padding-block: 8px 48px;
}
.zsp-chapters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.zsp-chapters button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 14px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  transition:
    background 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.zsp-chapters button small {
  margin-left: 6px;
  color: var(--subtle);
  font-size: 12px;
}
.zsp-chapters button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.zsp-chapters button[aria-pressed="true"] small {
  color: inherit;
  opacity: 0.7;
}
.zsp-chapters button:focus-visible,
.zsp-controls button:focus-visible,
.zsp-progress button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.zsp-stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(150px, 220px) 1fr minmax(150px, 220px);
  align-items: center;
  gap: 0;
  min-height: 330px;
  padding: 28px 28px 96px;
  border-radius: 24px;
  background: var(--card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.zsp-actor {
  position: relative;
  z-index: 2;
  display: grid;
  justify-items: center;
  gap: 2px;
  text-align: center;
}
.zsp-actor strong {
  font-size: 17px;
}
.zsp-actor small {
  color: var(--subtle);
  font-size: 13px;
}
.zsp-icon {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin-bottom: 6px;
  border-radius: 20px;
  background: var(--blue-soft);
  color: var(--blue);
  transition:
    transform 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}
.zsp-actor.pulse .zsp-icon {
  transform: scale(1.08);
  box-shadow: 0 0 0 6px color-mix(in oklab, var(--blue) 18%, transparent);
}
.zsp-attacker {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  grid-auto-flow: column;
  align-items: center;
  gap: 12px;
  text-align: left;
}
.zsp-attacker[hidden] {
  display: none;
}
.zsp-attacker .zsp-icon {
  width: 52px;
  height: 52px;
  margin: 0;
  background: color-mix(in oklab, #e5484d 14%, transparent);
  color: #e5484d;
}
.zsp-attacker small {
  display: block;
}

.zsp-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  min-height: 28px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.zsp-badges li {
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.5;
  animation: zsp-pop 0.5s var(--ease) both;
}
.zsp-badges li.ok {
  color: #1a8a5b;
  border-color: color-mix(in oklab, #1a8a5b 35%, transparent);
}
@keyframes zsp-pop {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.92);
  }
}

.zsp-wire {
  position: relative;
  z-index: 1;
  height: 100%;
  min-height: 120px;
}
.zsp-wire-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 36px;
  border-top: 2px dashed color-mix(in oklab, var(--ink) 22%, transparent);
}
.zsp-wire-label {
  position: absolute;
  left: 50%;
  top: 8px;
  transform: translateX(-50%);
  white-space: nowrap;
  color: var(--subtle);
  font-size: 12.5px;
}

.zsp-packet {
  position: absolute;
  z-index: 3;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  white-space: nowrap;
  box-shadow: 0 6px 18px -8px rgba(59, 111, 224, 0.7);
  will-change: transform, opacity;
  pointer-events: none;
}
.zsp-packet.enc {
  background: #138a96;
  box-shadow: 0 6px 18px -8px rgba(19, 138, 150, 0.7);
}
.zsp-packet.human {
  background: var(--amber);
  color: #3a2a00;
  border: 2px dashed rgba(58, 42, 0, 0.35);
}
.zsp-packet.attack {
  background: #e5484d;
  box-shadow: 0 6px 18px -8px rgba(229, 72, 77, 0.7);
}
.zsp-packet svg {
  flex: none;
}

.zsp-result {
  position: absolute;
  z-index: 4;
  right: 24px;
  bottom: 28px;
  max-width: 46%;
  padding: 8px 14px;
  border-radius: 12px;
  background: color-mix(in oklab, #e5484d 12%, var(--card));
  color: #c0272d;
  font-size: 14px;
  font-weight: 600;
  animation: zsp-pop 0.5s var(--ease) both;
}
.zsp-result[hidden] {
  display: none;
}
.zsp-result::before {
  content: "✕ ";
}

.zsp-card {
  margin-top: 18px;
  padding: 22px 24px 20px;
  border-radius: 20px;
  background: var(--card);
  box-shadow: var(--shadow-card);
}
.zsp-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.zsp-step-pill {
  padding: 2px 12px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
}
.zsp-step-count {
  color: var(--subtle);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.zsp-card h2 {
  margin: 12px 0 8px;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.3;
}
.zsp-card p {
  margin: 0;
  color: var(--muted);
}
.zsp-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}
.zsp-notes section {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--bg);
}
.zsp-notes h3 {
  margin: 0 0 4px;
  font-size: 13.5px;
  color: var(--ink);
}
.zsp-notes p {
  font-size: 14.5px;
}

.zsp-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}
.zsp-controls .button {
  cursor: pointer;
  font: inherit;
}
.zsp-progress {
  display: flex;
  flex: 1 1 220px;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}
.zsp-progress button {
  appearance: none;
  width: 12px;
  height: 12px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: color-mix(in oklab, var(--ink) 16%, transparent);
  cursor: pointer;
  transition:
    transform 0.2s var(--ease),
    background 0.2s var(--ease);
}
.zsp-progress button.done {
  background: color-mix(in oklab, var(--blue) 55%, transparent);
}
.zsp-progress button[aria-current="step"] {
  background: var(--blue);
  transform: scale(1.35);
}
.zsp-progress button.attack {
  background: color-mix(in oklab, #e5484d 30%, transparent);
}
.zsp-progress button.attack[aria-current="step"] {
  background: #e5484d;
}
.zsp-hint {
  margin: 12px 0 0;
  color: var(--subtle);
  font-size: 13.5px;
}

.zsp-facts {
  padding-block: 8px 80px;
}
.zsp-facts h2 {
  margin: 0 0 12px;
  font-size: 24px;
}
.zsp-facts ul {
  display: grid;
  gap: 8px;
  padding-left: 20px;
  color: var(--muted);
}
.zsp-facts li strong {
  color: var(--ink);
}
.zsp-facts .actions {
  margin-top: 20px;
}

@media (max-width: 760px) {
  .zsp-stage {
    grid-template-columns: minmax(96px, 1fr) minmax(48px, 0.5fr) minmax(96px, 1fr);
    padding: 20px 12px 130px;
  }
  .zsp-wire-label {
    display: none;
  }
  .zsp-icon {
    width: 56px;
    height: 56px;
  }
  .zsp-notes {
    grid-template-columns: 1fr;
  }
  .zsp-result {
    right: 12px;
    left: 12px;
    max-width: none;
    bottom: 10px;
  }
  .zsp-attacker {
    bottom: 64px;
  }
  .zsp-progress {
    justify-content: flex-start;
  }
}
@media (prefers-reduced-motion: reduce) {
  .zsp-badges li,
  .zsp-result {
    animation: none;
  }
  .zsp-icon {
    transition: none;
  }
}