.page-contact {
  --pc-cut: 16px;
  --pc-soft: rgba(11, 40, 49, .72);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(28px, 5vw, 52px);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(59, 44, 110, .42), transparent 62%),
    radial-gradient(90% 70% at 100% 100%, rgba(11, 40, 49, .9), transparent 70%);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 140px;
  pointer-events: none;
  opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 140' preserveAspectRatio='none'%3E%3Cpath d='M0 108 C 210 46, 400 148, 620 92 S 1010 22, 1200 78' fill='none' stroke='%233B2C6E' stroke-width='1.4'/%3E%3Cpath d='M0 128 C 240 78, 430 156, 660 116 S 1030 52, 1200 104' fill='none' stroke='%238FA9AE' stroke-width='1' opacity='0.5'/%3E%3C/svg%3E");
  background-size: 100% 100%;
  background-repeat: no-repeat;
}

.page-contact .contact-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  align-items: center;
}

.page-contact .contact-hero__lead h1 {
  margin: 10px 0 0;
  font-size: clamp(34px, 8vw, 56px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-contact .contact-hero__lead .lead {
  margin-top: 18px;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .contact-hero__meta {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--neon);
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-contact .contact-hero__media .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .contact-hero__media .media-frame__caption {
  font-size: 13px;
  color: var(--slate);
}

/* ---------- 联络通道 ---------- */
.page-contact .contact-channels {
  padding-top: clamp(48px, 8vw, 88px);
}

.page-contact .channel-band {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .channel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px 26px;
  background: linear-gradient(158deg, var(--panel), var(--cabin) 88%);
  border: 1px solid var(--line-soft);
  border-top-width: 2px;
  clip-path: polygon(var(--pc-cut) 0, 100% 0, 100% calc(100% - var(--pc-cut)), calc(100% - var(--pc-cut)) 100%, 0 100%, 0 var(--pc-cut));
}

.page-contact .channel--mail { border-top-color: var(--neon); }
.page-contact .channel--call { border-top-color: var(--amber); }
.page-contact .channel--post { border-top-color: var(--slate); }

.page-contact .channel__label {
  margin: 0;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--slate);
}

.page-contact .channel__value {
  margin: 0;
  font-size: clamp(15px, 3.6vw, 18px);
  line-height: 1.5;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.page-contact .channel--mail .channel__value { color: var(--neon); }

.page-contact .channel__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-contact .channel__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
  opacity: .85;
}

.page-contact .channel__toggle,
.page-contact .flow-step__toggle {
  align-self: flex-start;
  margin-top: 4px;
  padding: 8px 14px;
  background: rgba(5, 19, 24, .6);
  border: 1px dashed var(--line);
  color: var(--neon);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.page-contact .channel__toggle:hover,
.page-contact .flow-step__toggle:hover,
.page-contact .channel__toggle:focus-visible,
.page-contact .flow-step__toggle:focus-visible {
  background: rgba(37, 245, 194, .12);
  border-color: var(--neon);
  outline: none;
}

.page-contact .channel__toggle[aria-expanded="true"],
.page-contact .flow-step__toggle[aria-expanded="true"] {
  background: rgba(37, 245, 194, .16);
  border-style: solid;
}

.page-contact .expand-panel {
  margin-top: 12px;
  padding: 14px 16px;
  background: rgba(5, 19, 24, .72);
  border-left: 2px solid var(--neon);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .expand-panel p {
  margin: 0;
}

.page-contact .expand-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .expand-list li {
  position: relative;
  padding-left: 16px;
}

.page-contact .expand-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .75em;
  width: 6px;
  height: 1px;
  background: var(--neon);
}

/* ---------- 文档优先 ---------- */
.page-contact .doc-first {
  padding-top: clamp(44px, 7vw, 76px);
}

.page-contact .doc-first__grid {
  display: grid;
  gap: 26px;
}

.page-contact .doc-first__body h2 {
  margin: 10px 0 0;
  font-size: clamp(26px, 5.4vw, 36px);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-contact .doc-first__body p {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-contact .doc-first__body .btn {
  margin-top: 24px;
}

.page-contact .doc-first__aside {
  border-left: 2px solid var(--indigo);
}

.page-contact .doc-first__aside-title {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--amber);
}

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

.page-contact .doc-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .doc-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  background: var(--neon);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

/* ---------- 提交要点 ---------- */
.page-contact .tips {
  padding-top: clamp(44px, 7vw, 76px);
}

.page-contact .tips .filter-bar {
  margin-top: 24px;
}

.page-contact .tip-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .tip {
  padding: 20px 20px 22px;
  background: var(--pc-soft);
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--heat);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-contact .tip__name {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-contact .tip__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .tip__items li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--slate);
}

.page-contact .tip__items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 6px;
  height: 1px;
  background: var(--slate);
}

.page-contact [data-filter-empty] {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--amber);
  background: rgba(5, 19, 24, .7);
  font-size: 14px;
  color: var(--slate);
}

/* ---------- 合作与反馈 ---------- */
.page-contact .collab {
  padding-top: clamp(44px, 7vw, 76px);
}

.page-contact .collab__grid {
  display: grid;
  gap: 26px;
}

.page-contact .collab__body h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-contact .collab__body p {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-contact .collab__body a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-contact .collab__body a:hover,
.page-contact .collab__body a:focus-visible {
  border-bottom-color: var(--neon);
  outline: none;
}

.page-contact .collab__aside {
  padding: 22px 22px 24px;
  background: linear-gradient(150deg, rgba(59, 44, 110, .38), rgba(11, 40, 49, .85));
  border: 1px solid var(--line-faint);
  clip-path: polygon(var(--pc-cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--pc-cut));
}

.page-contact .collab__aside-label {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-contact .collab__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}

.page-contact .collab__steps li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-faint);
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
}

.page-contact .collab__steps li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .collab__steps .data {
  font-size: 13px;
  color: var(--amber);
}

/* ---------- 处理流程 ---------- */
.page-contact .flow {
  padding-top: clamp(44px, 7vw, 76px);
}

.page-contact .flow__grid {
  display: grid;
  gap: 30px;
}

.page-contact .flow__media .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .flow__body h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-contact .flow__intro {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

.page-contact .flow-steps {
  list-style: none;
  position: relative;
  margin: 30px 0 0;
  padding: 0;
}

.page-contact .flow-steps::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon), rgba(37, 245, 194, .06));
}

.page-contact .flow-step {
  position: relative;
  padding: 0 0 26px 50px;
}

.page-contact .flow-step:last-child {
  padding-bottom: 0;
}

.page-contact .flow-step__no {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  font-size: 12px;
  color: var(--neon);
  background: var(--cabin);
  border: 1px solid var(--line);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.page-contact .flow-step h3 {
  margin: 2px 0 8px;
  font-size: 19px;
  line-height: 1.3;
  font-weight: 800;
  color: var(--mist);
}

.page-contact .flow-step > p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-contact .flow-step .expand-panel {
  font-size: 14px;
  color: var(--slate);
}

/* ---------- 收尾 ---------- */
.page-contact .closing {
  padding-top: clamp(40px, 6vw, 64px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-contact .closing__rule {
  height: 1px;
  background: linear-gradient(90deg, var(--neon), rgba(143, 169, 174, .2) 45%, rgba(143, 169, 174, 0));
  box-shadow: 0 0 0 1px rgba(37, 245, 194, .04);
}

.page-contact .closing__grid {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-contact .closing__text {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-contact .closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-contact .closing__links a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-contact .closing__links a:hover,
.page-contact .closing__links a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
  outline: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .channel-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact .channel--post {
    grid-column: 1 / -1;
  }

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

  .page-contact .collab__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    align-items: start;
    gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 52px;
  }

  .page-contact .doc-first__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .8fr);
    gap: 48px;
    align-items: start;
  }

  .page-contact .channel-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-contact .channel--post {
    grid-column: auto;
  }

  .page-contact .flow__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    gap: 56px;
    align-items: start;
  }

  .page-contact .closing__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

  .page-contact .closing__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-contact .channel {
    padding: 28px 26px 30px;
  }

  .page-contact .flow-step {
    padding-bottom: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel__toggle,
  .page-contact .flow-step__toggle,
  .page-contact .closing__links a {
    transition: none;
  }
}