.page-contact {
  --pc-gap: clamp(56px, 8vw, 104px);
  --pc-line: rgba(245, 247, 246, 0.12);
  background: var(--obsidian);
  color: var(--mica);
  overflow-x: clip;
}

.page-contact .section {
  padding: var(--pc-gap) 0;
}

.page-contact .seq {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pitch);
  margin: 0 0 14px;
}

.page-contact .section-title {
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0;
  max-width: 20em;
}

.page-contact .lede {
  margin: 18px 0 0;
  max-width: 40em;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.page-contact .sec-head {
  margin-bottom: clamp(32px, 5vw, 52px);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--rule);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(620px, 96vw);
  height: min(620px, 96vw);
  background: radial-gradient(circle at 50% 50%, rgba(0, 225, 123, 0.16), rgba(0, 225, 123, 0) 62%);
  pointer-events: none;
}

.page-contact .contact-hero .wrap {
  position: relative;
}

.page-contact .contact-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(2.1rem, 8vw, 4.5rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.025em;
  max-width: 15em;
}

.page-contact .hero-quick {
  list-style: none;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-contact .hero-quick a {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border: 1px solid var(--pc-line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-decoration: none;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-contact .hero-quick a:hover,
.page-contact .hero-quick a:focus-visible,
.page-contact .hero-quick a[aria-current="true"] {
  border-color: var(--pitch);
  color: var(--mica);
  background-color: rgba(0, 225, 123, 0.08);
}

/* ---------- 合作方向 ---------- */
.page-contact .dir-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-contact .dir-card {
  padding: 26px 22px 28px;
  border: 1px solid var(--pc-line);
  background: linear-gradient(180deg, rgba(28, 35, 41, 0.92), rgba(10, 13, 16, 0.92));
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

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

.page-contact .dir-who {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pitch);
}

.page-contact .dir-title {
  margin: 14px 0 0;
  font-size: 1.18rem;
  font-weight: 900;
  line-height: 1.35;
}

.page-contact .dir-body {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-contact .dir-check {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--blue);
  color: var(--muted-soft);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 对接流程 ---------- */
.page-contact .flow {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

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

.page-contact .flow-step {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid rgba(245, 247, 246, 0.16);
  background: rgba(10, 13, 16, 0.46);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease), background-color 0.35s var(--ease);
}

.page-contact .flow-step:hover,
.page-contact .flow-step:focus-within {
  border-color: var(--pitch);
  background: rgba(10, 13, 16, 0.72);
  transform: translateY(-4px);
}

.page-contact .flow-num {
  display: inline-block;
  padding: 3px 10px;
  background: var(--pitch);
  color: var(--obsidian);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-contact .flow-title {
  margin: 16px 0 0;
  font-size: 1.08rem;
  font-weight: 900;
  line-height: 1.3;
}

.page-contact .flow-text {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-contact .flow-ask {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--pc-line);
  color: var(--muted-soft);
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-contact .flow-ask .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-contact .flow-figure {
  margin: clamp(32px, 5vw, 52px) 0 0;
}

/* ---------- 联系渠道 ---------- */
.page-contact .channels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-contact .channel-card {
  position: relative;
  padding: 32px 24px 28px;
  border: 1px solid rgba(10, 13, 16, 0.18);
  color: var(--obsidian);
  overflow: hidden;
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--pitch);
}

.page-contact .channel-card:nth-child(2)::before {
  background: var(--blue);
}

.page-contact .channel-card:nth-child(3)::before {
  background: var(--orange);
}

.page-contact .channel-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted-dark);
}

.page-contact .channel-value {
  margin: 14px 0 0;
  font-size: clamp(1.05rem, 4vw, 1.32rem);
  font-weight: 700;
  line-height: 1.4;
  word-break: break-word;
  color: var(--obsidian);
}

.page-contact .channel-desc {
  margin: 14px 0 0;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--muted-dark);
}

.page-contact .channels-note {
  margin: 26px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--orange);
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 48em;
}

/* ---------- 地址与来访 ---------- */
.page-contact .addr-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-contact .addr-value {
  margin: 26px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--pc-line);
  border-left: 4px solid var(--pitch);
  font-size: clamp(0.98rem, 3.4vw, 1.15rem);
  line-height: 1.6;
  color: var(--mica);
}

.page-contact .addr-notes {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .addr-note-item {
  position: relative;
  padding-left: 22px;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.8;
}

.page-contact .addr-note-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 1px;
  background: var(--blue);
}

.page-contact .addr-figure {
  aspect-ratio: 10 / 7;
  margin: 0;
}

/* ---------- 提交建议 ---------- */
.page-contact .brief-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--pc-line);
}

.page-contact .brief-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--pc-line);
}

.page-contact .brief-k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pitch);
}

.page-contact .brief-v {
  color: var(--muted);
  font-size: 0.97rem;
  line-height: 1.8;
  max-width: 46em;
}

.page-contact .brief-tail {
  margin: 28px 0 0;
  color: var(--muted-soft);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-contact .brief-tail a {
  color: var(--pitch);
}

/* ---------- 常见疑问 ---------- */
.page-contact .qa-list {
  border-top: 1px solid var(--pc-line);
}

.page-contact .qa {
  border-bottom: 1px solid var(--pc-line);
}

.page-contact .qa summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 20px 44px 20px 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--mica);
  transition: color 0.3s var(--ease);
}

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

.page-contact .qa summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  line-height: 1;
  color: var(--pitch);
}

.page-contact .qa[open] summary::after {
  content: "–";
}

.page-contact .qa summary:hover {
  color: var(--pitch);
}

.page-contact .qa p {
  margin: 0 0 22px;
  max-width: 46em;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.82;
}

/* ---------- 下一步 ---------- */
.page-contact .next {
  border-top: 1px solid var(--rule);
  background: linear-gradient(180deg, rgba(12, 59, 54, 0.34), rgba(10, 13, 16, 0));
}

.page-contact .next-links {
  margin: 32px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .next-links .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .brief-item {
    grid-template-columns: 190px 1fr;
    gap: 26px;
    align-items: start;
  }

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

  .page-contact .dir-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-contact .dir-grid > :nth-child(even) {
    margin-top: 30px;
  }

  .page-contact .flow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .page-contact .channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-contact .dir-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-contact .dir-grid > .dir-card {
    grid-column: span 6;
  }

  .page-contact .dir-grid > .dir-card:nth-child(4n + 1) {
    grid-column: span 7;
  }

  .page-contact .dir-grid > .dir-card:nth-child(4n + 2) {
    grid-column: span 5;
    margin-top: 46px;
  }

  .page-contact .dir-grid > .dir-card:nth-child(4n + 3) {
    grid-column: span 5;
  }

  .page-contact .dir-grid > .dir-card:nth-child(4n + 4) {
    grid-column: span 7;
    margin-top: -18px;
  }

  .page-contact .flow-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 28px;
  }

  .page-contact .flow-step + .flow-step::before {
    content: "";
    position: absolute;
    left: -28px;
    top: 34px;
    width: 28px;
    height: 1px;
    background: var(--pitch);
    opacity: 0.55;
  }

  .page-contact .addr-grid {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 56px;
    align-items: start;
  }

  .page-contact .addr-figure {
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .dir-card,
  .page-contact .flow-step,
  .page-contact .hero-quick a {
    transition: none;
  }

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