.page-contact {
  --pc-gap: clamp(64px, 9vw, 132px);
  --pc-pad: clamp(20px, 3vw, 32px);
  display: block;
  padding-bottom: clamp(72px, 10vw, 140px);
}

.page-contact .section-head {
  margin-bottom: clamp(24px, 3vw, 40px);
}

.page-contact h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.4vw, 4.1rem);
  line-height: 1.1;
  letter-spacing: -0.022em;
  color: var(--text);
  margin: 16px 0 0;
  max-width: 18ch;
}

.page-contact h2.section-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.4vw, 2.3rem);
  line-height: 1.28;
  letter-spacing: -0.012em;
  color: var(--text);
  margin: 12px 0 0;
}

.page-contact h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.5;
  color: var(--text);
  margin: 0 0 10px;
}

.page-contact p {
  line-height: 1.85;
  color: var(--muted);
  margin: 0 0 14px;
}

.page-contact p:last-child {
  margin-bottom: 0;
}

/* ---------- 首屏 ---------- */
.page-contact .pc-intro {
  padding-top: clamp(28px, 5vw, 56px);
  position: relative;
}

.page-contact .pc-intro::before {
  content: "";
  position: absolute;
  top: clamp(28px, 5vw, 56px);
  left: 0;
  width: 54px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .pc-intro__lead {
  max-width: 64ch;
  font-size: clamp(1.02rem, 1.6vw, 1.16rem);
  color: var(--muted);
  margin-top: 22px;
}

.page-contact .pc-intro__meta {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--line-w) solid var(--line);
}

.page-contact .pc-intro__meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
}

.page-contact .pc-intro__k {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-contact .pc-intro__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--cyan);
  word-break: break-word;
}

/* ---------- 三条通道 ---------- */
.page-contact .pc-channels {
  margin-top: var(--pc-gap);
}

.page-contact .pc-channels__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-contact .pc-channel {
  position: relative;
  background: var(--panel);
  border: var(--line-w) solid var(--line);
  padding: calc(var(--pc-pad) + 26px) var(--pc-pad) var(--pc-pad);
  box-shadow: var(--shadow-hard);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-contact .pc-channel:hover,
.page-contact .pc-channel:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0), var(--shadow-cyan);
}

.page-contact .pc-channel__no {
  position: absolute;
  top: 14px;
  left: var(--pc-pad);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-contact .pc-channel__name {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 12px;
}

.page-contact .pc-channel__value {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
}

.page-contact .pc-channel__mono {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(0.92rem, 1.6vw, 1.06rem);
  line-height: 1.5;
  color: var(--text);
  word-break: break-all;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 2px;
}

.page-contact .pc-channel__value--text {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  display: block;
}

.page-contact .pc-copy-btn {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  background: transparent;
  border: var(--line-w) solid var(--line);
  color: var(--cyan);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .pc-copy-btn:hover {
  border-color: var(--cyan);
  background: rgba(43, 227, 198, 0.1);
}

.page-contact .pc-copy-btn[data-copied] {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink-deep);
}

.page-contact .pc-channel__note {
  font-size: 0.94rem;
  color: var(--muted);
}

.page-contact .pc-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-contact .pc-figure img,
.page-contact .pc-banner img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 场景选择 ---------- */
.page-contact .pc-scene {
  margin-top: var(--pc-gap);
}

.page-contact .pc-tabs {
  border: var(--line-w) solid var(--line);
  background: var(--panel-soft);
}

.page-contact .pc-tabs .tabs__list {
  display: flex;
  overflow-x: auto;
  background: var(--panel);
  border-bottom: var(--line-w) solid var(--line);
  scrollbar-width: thin;
}

.page-contact .pc-tabs .tabs__tab {
  flex: 0 0 auto;
  padding: 14px 18px;
  background: transparent;
  border: 0;
  border-right: var(--line-w) solid var(--line);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .pc-tabs .tabs__tab:hover {
  color: var(--text);
  background: rgba(43, 227, 198, 0.08);
}

.page-contact .pc-tabs .tabs__tab[aria-selected="true"] {
  background: var(--cyan);
  color: var(--ink-deep);
  font-weight: 700;
}

.page-contact .pc-tabs .tabs__panel {
  padding: clamp(22px, 3vw, 34px) var(--pc-pad);
}

.page-contact .pc-tabs .tabs__panel[hidden] {
  display: none;
}

.page-contact .pc-scene__pick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--text);
  margin-bottom: 16px;
  word-break: break-all;
}

.page-contact .pc-scene__sla {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  border-left: 2px solid var(--amber);
  padding-left: 12px;
  margin-top: 18px;
}

/* ---------- 发信准备 ---------- */
.page-contact .pc-prep {
  margin-top: var(--pc-gap);
}

.page-contact .pc-prep__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-contact .pc-prep__list li {
  position: relative;
  border-top: var(--line-w) solid var(--line);
  padding: 22px 0 4px 0;
}

.page-contact .pc-prep__list li::after {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .pc-prep__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-contact .pc-prep__list li p {
  font-size: 0.95rem;
}

/* ---------- 响应节奏 ---------- */
.page-contact .pc-rhythm {
  margin-top: var(--pc-gap);
}

.page-contact .pc-rhythm__copy {
  max-width: 66ch;
}

.page-contact .pc-scale {
  margin-top: 30px;
  border: var(--line-w) solid var(--line);
  background: var(--panel);
  padding: 20px var(--pc-pad) 16px;
}

.page-contact .pc-scale__cap {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 14px;
}

.page-contact .pc-scale__bar {
  display: flex;
  gap: 4px;
  align-items: flex-end;
  height: 20px;
}

.page-contact .pc-scale__bar i {
  position: relative;
  flex: 1 1 0;
  height: 18px;
  background: var(--line);
}

.page-contact .pc-scale__bar i::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan);
}

.page-contact .pc-scale__bar i:nth-child(10)::before {
  background: var(--violet);
}

.page-contact .pc-scale__labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--muted);
  margin: 10px 0 0;
}

.page-contact .pc-banner {
  margin: clamp(28px, 4vw, 48px) 0 0;
  aspect-ratio: 16 / 7;
}

/* ---------- 合作 ---------- */
.page-contact .pc-coop {
  margin-top: var(--pc-gap);
}

.page-contact .pc-coop__lead {
  max-width: 68ch;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  margin-bottom: clamp(26px, 3vw, 40px);
}

.page-contact .pc-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: var(--line-w) solid var(--line);
}

.page-contact .pc-flow__step {
  border-bottom: var(--line-w) solid var(--line);
  background: var(--panel-soft);
}

.page-contact .pc-flow__step summary {
  list-style: none;
  cursor: pointer;
  padding: 20px var(--pc-pad);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 14px;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .pc-flow__step summary::-webkit-details-marker {
  display: none;
}

.page-contact .pc-flow__step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--cyan);
}

.page-contact .pc-flow__step[open] summary {
  background: rgba(43, 227, 198, 0.08);
  color: var(--cyan);
}

.page-contact .pc-flow__step[open] summary::after {
  content: "−";
}

.page-contact .pc-flow__step summary:hover {
  background: rgba(43, 227, 198, 0.12);
}

.page-contact .pc-flow__step p {
  padding: 0 var(--pc-pad) 20px;
  margin: 0;
  font-size: 0.95rem;
}

.page-contact .pc-flow__no {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

/* ---------- 下一站 ---------- */
.page-contact .pc-next {
  margin-top: var(--pc-gap);
  border-top: var(--line-w) solid var(--line);
  padding-top: clamp(24px, 3vw, 36px);
}

.page-contact .pc-next__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-contact .pc-next__list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0 16px 16px;
  border-left: 2px solid var(--line);
  text-decoration: none;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-contact .pc-next__list a:hover,
.page-contact .pc-next__list a:focus-visible {
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-contact .pc-next__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.page-contact .pc-next__desc {
  font-size: 0.9rem;
  color: var(--muted);
}

.page-contact a:focus-visible,
.page-contact button:focus-visible,
.page-contact summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .pc-intro__meta {
    grid-template-columns: repeat(3, 1fr);
    border-bottom: var(--line-w) solid var(--line);
  }

  .page-contact .pc-intro__meta li {
    padding: 16px 18px;
    border-bottom: 0;
    border-left: 2px solid var(--line);
  }

  .page-contact .pc-prep__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
  }

  .page-contact .pc-next__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

@media (min-width: 940px) {
  .page-contact .pc-channels__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-contact .pc-tabs .tabs__panel {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 8px 40px;
    align-items: start;
  }

  .page-contact .pc-tabs .tabs__panel[hidden] {
    display: none;
  }

  .page-contact .pc-scene__pick {
    grid-column: 1 / -1;
  }

  .page-contact .pc-scene__sla {
    grid-column: 2 / 3;
    grid-row: 2 / 4;
    align-self: start;
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pc-channel,
  .page-contact .pc-copy-btn,
  .page-contact .pc-tabs .tabs__tab,
  .page-contact .pc-flow__step summary,
  .page-contact .pc-next__list a {
    transition: none;
  }

  .page-contact .pc-channel:hover,
  .page-contact .pc-channel:focus-within {
    transform: none;
  }
}