.page-contact {
  --pc-gap: clamp(18px, 3vw, 28px);
  --pc-hair: rgba(159, 179, 200, 0.18);
  --pc-hair-soft: rgba(159, 179, 200, 0.1);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(26px, 5vw, 56px) 0 clamp(32px, 5vw, 60px);
  overflow: hidden;
  background:
    radial-gradient(90% 120% at 4% 0%, rgba(0, 229, 208, 0.12), transparent 62%),
    radial-gradient(70% 90% at 100% 100%, rgba(124, 92, 255, 0.14), transparent 60%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 84%);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--amber), transparent);
  opacity: 0.55;
}

.page-contact .contact-hero__grid {
  display: grid;
  gap: var(--pc-gap);
  align-items: center;
}

.page-contact .contact-hero h1 {
  margin: 14px 0 0;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: clamp(1.75rem, 6vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-contact .contact-hero .lede {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: var(--t-16);
  line-height: 1.78;
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-contact .contact-hero__media {
  margin: 0;
  position: relative;
}

.page-contact .contact-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 章节标题 ---------- */
.page-contact .sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-contact .sec-head .sec-title {
  margin: 0;
  color: var(--paper);
}

.page-contact .sec-head .lede {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: var(--t-16);
  line-height: 1.78;
}

/* ---------- 01 可以谈什么 ---------- */
.page-contact .dir-grid {
  display: grid;
  gap: var(--pc-gap);
}

.page-contact .dir-card {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: clamp(20px, 3vw, 28px);
  background: linear-gradient(180deg, var(--ink-700) 0%, rgba(16, 42, 62, 0.68) 100%);
  border: 1px solid var(--pc-hair);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-contact .dir-card:nth-child(1) {
  border-top: 2px solid var(--cyan);
}

.page-contact .dir-card:nth-child(2) {
  border-top: 2px solid var(--violet);
}

.page-contact .dir-card:nth-child(3) {
  border-top: 2px solid var(--amber);
}

.page-contact .dir-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.page-contact .dir-card h3 {
  margin: 0;
  font-size: var(--t-20);
  line-height: 1.45;
  color: var(--paper);
}

.page-contact .dir-card p {
  margin: 0;
  font-size: var(--t-16);
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .dir-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .dir-list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--t-14);
  line-height: 1.72;
  color: var(--muted);
}

.page-contact .dir-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-contact .dir-link {
  justify-self: start;
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--line-strong);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-contact .dir-link:hover,
.page-contact .dir-link:focus-visible {
  color: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

/* ---------- 02 支持渠道 ---------- */
.page-contact .channel-grid {
  display: grid;
  gap: var(--pc-gap);
  align-items: start;
}

.page-contact .channel-media {
  margin: 0;
}

.page-contact .channel-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-contact .channel-cards {
  display: grid;
  gap: var(--pc-gap);
}

.page-contact .channel-card {
  display: grid;
  gap: 12px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-700);
  border: 1px solid var(--pc-hair);
}

.page-contact .channel-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-contact .channel-card__value {
  margin: 0;
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1rem, 3.4vw, 1.25rem);
  letter-spacing: 0.01em;
  color: var(--cyan);
  word-break: break-all;
}

.page-contact .channel-card p {
  margin: 0;
  font-size: var(--t-16);
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .channel-card .channel-card__meta {
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  padding-top: 10px;
  border-top: 1px dashed var(--pc-hair-soft);
}

.page-contact .copy-btn {
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.1em;
}

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

/* ---------- 03 信息清单 ---------- */
.page-contact .check-grid {
  display: grid;
  gap: var(--pc-gap);
  align-items: start;
}

.page-contact .check-panel {
  padding: 8px;
  background: var(--ink-700);
  border: 1px solid var(--pc-hair);
}

.page-contact .check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-contact .check-item + .check-item {
  border-top: 1px dashed var(--pc-hair-soft);
}

.page-contact .check-label {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 14px;
  cursor: pointer;
  transition: background 0.3s var(--ease);
}

.page-contact .check-label:hover {
  background: rgba(0, 229, 208, 0.05);
}

.page-contact .check-box {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  margin: 3px 0 0;
  border: 1px solid var(--muted);
  background: transparent;
  display: grid;
  place-content: center;
  cursor: pointer;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-contact .check-box::before {
  content: "";
  width: 10px;
  height: 5px;
  border-left: 2px solid var(--ink-900);
  border-bottom: 2px solid var(--ink-900);
  transform: rotate(-45deg) scale(0);
  transition: transform 0.2s var(--ease);
  margin-top: -2px;
}

.page-contact .check-box:checked {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-contact .check-box:checked::before {
  transform: rotate(-45deg) scale(1);
}

.page-contact .check-box:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-contact .check-index {
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.12em;
  color: var(--amber);
  padding-top: 5px;
}

.page-contact .check-body {
  display: grid;
  gap: 4px;
}

.page-contact .check-body strong {
  font-size: var(--t-16);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-contact .check-body span {
  font-size: var(--t-14);
  line-height: 1.72;
  color: var(--muted);
}

.page-contact .check-aside {
  padding: clamp(20px, 3vw, 28px);
  background: linear-gradient(180deg, rgba(142, 27, 58, 0.26) 0%, var(--ink-700) 66%);
  border: 1px solid rgba(255, 46, 136, 0.3);
}

.page-contact .check-aside h3 {
  margin: 12px 0 12px;
  font-size: var(--t-20);
  line-height: 1.45;
  color: var(--paper);
}

.page-contact .check-aside p {
  margin: 0 0 12px;
  font-size: var(--t-14);
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 04 推进节奏 ---------- */
.page-contact .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  position: relative;
}

.page-contact .flow-steps::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  pointer-events: none;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan) 32%, var(--amber) 74%, var(--magenta) 100%);
  opacity: 0.5;
}

.page-contact .flow-step {
  position: relative;
  margin-left: 40px;
  padding: 20px 20px 22px;
  background: var(--ink-700);
  border: 1px solid var(--pc-hair);
  border-left: 2px solid transparent;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-contact .flow-step::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 28px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 208, 0.12);
  transition: border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.page-contact .flow-step:nth-child(3)::before,
.page-contact .flow-step:nth-child(4)::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 179, 58, 0.12);
}

.page-contact .flow-step:hover,
.page-contact .flow-step:focus-within {
  transform: translateY(-4px);
  border-left-color: var(--cyan);
  box-shadow: 0 20px 44px -26px rgba(0, 229, 208, 0.55);
}

.page-contact .flow-step:nth-child(3):hover,
.page-contact .flow-step:nth-child(3):focus-within,
.page-contact .flow-step:nth-child(4):hover,
.page-contact .flow-step:nth-child(4):focus-within {
  border-left-color: var(--amber);
  box-shadow: 0 20px 44px -26px rgba(255, 179, 58, 0.55);
}

.page-contact .flow-step__num {
  display: block;
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-contact .flow-step h3 {
  margin: 0 0 8px;
  font-size: var(--t-20);
  line-height: 1.45;
  color: var(--paper);
}

.page-contact .flow-step > p {
  margin: 0;
  font-size: var(--t-16);
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .flow-step__prep {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--pc-hair);
  display: grid;
  gap: 2px;
}

.page-contact .flow-step__prep .prep-label {
  font-family: var(--f-mono);
  font-size: var(--t-12);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 6px 0 0;
}

.page-contact .flow-step__prep p {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 05 办公与备案 ---------- */
.page-contact .office-grid {
  display: grid;
  gap: var(--pc-gap);
}

.page-contact .office-card {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-700);
  border: 1px solid var(--pc-hair);
}

.page-contact .office-value {
  margin: 0;
  font-size: var(--t-20);
  line-height: 1.6;
  color: var(--paper);
}

.page-contact .office-value--mono {
  font-family: var(--f-mono);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-contact .office-note {
  margin: 0;
  font-size: var(--t-14);
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .flow-step {
    margin-left: 52px;
    padding: 22px 24px 24px;
  }

  .page-contact .flow-steps::before {
    left: 25px;
  }

  .page-contact .flow-step::before {
    left: -34px;
  }
}

@media (min-width: 820px) {
  .page-contact .dir-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .office-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-contact .contact-hero__media img {
    aspect-ratio: 4 / 3;
  }

  .page-contact .check-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(20px, 3vw, 32px);
  }
}

@media (min-width: 960px) {
  .page-contact .channel-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(24px, 4vw, 40px);
  }

  .page-contact .channel-media,
  .page-contact .channel-media img {
    height: 100%;
  }

  .page-contact .channel-media img {
    aspect-ratio: 3 / 4;
  }
}

@media (max-width: 379px) {
  .page-contact .flow-step {
    margin-left: 32px;
    padding: 16px 16px 18px;
  }

  .page-contact .flow-steps::before {
    left: 15px;
  }

  .page-contact .flow-step::before {
    left: -22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .dir-card,
  .page-contact .flow-step,
  .page-contact .copy-btn,
  .page-contact .check-box {
    transition: none;
  }

  .page-contact .dir-card:hover,
  .page-contact .flow-step:hover,
  .page-contact .flow-step:focus-within {
    transform: none;
  }
}