.page-contact {
  padding-top: var(--head-h);
  background: var(--ink);
  color: var(--on-dark);
}

.page-contact *,
.page-contact *::before,
.page-contact *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-contact .fb-crumbs {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-contact .fb-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--on-dark-3);
}

.page-contact .fb-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(199, 205, 214, 0.4);
}

.page-contact .fb-crumbs a {
  color: var(--on-dark-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .fb-crumbs a:hover,
.page-contact .fb-crumbs a:focus-visible {
  color: var(--aurora);
  border-bottom-color: var(--aurora);
}

/* ---------- 首屏 ---------- */
.page-contact .fb-hero {
  background: var(--ink);
  border-bottom: 1px solid rgba(199, 205, 214, 0.16);
  padding: clamp(20px, 4vw, 40px) 0 clamp(52px, 8vw, 96px);
}

.page-contact .fb-hero-grid {
  display: grid;
  gap: 44px;
}

.page-contact .fb-coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin: 0 0 22px;
}

.page-contact .fb-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(46px, 13vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 0 0 26px;
  color: var(--white);
}

.page-contact .fb-lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--on-dark-2);
  max-width: 46ch;
  margin: 0;
}

.page-contact .fb-hero-side {
  border-top: 1px solid var(--aurora);
  padding-top: 22px;
}

.page-contact .fb-side-note {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--on-dark-2);
}

.page-contact .fb-side-list {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-contact .fb-side-list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(199, 205, 214, 0.16);
}

.page-contact .fb-side-list dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--on-dark-3);
}

.page-contact .fb-side-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--on-dark);
  text-align: right;
}

/* ---------- 通用章节头 ---------- */
.page-contact .fb-head {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-contact .fb-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold-2);
  margin-bottom: 14px;
}

.page-contact .fb-head h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.4vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-contact .fb-head p {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--rock);
}

.page-contact .fb-head--dark .fb-num {
  color: var(--gold);
}

.page-contact .fb-head--dark h2 {
  color: var(--on-dark);
}

.page-contact .fb-head--dark p {
  color: var(--on-dark-3);
}

.page-contact .fb-intro {
  margin: 0 0 32px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
  max-width: 64ch;
}

.page-contact .fb-intro a {
  color: var(--aurora-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 01 三类来信 ---------- */
.page-contact .fb-three {
  background: var(--mist);
  color: var(--ink);
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-contact .fb-cols {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .fb-col {
  background: var(--white);
  padding: 28px 22px 32px;
}

.page-contact .fb-col-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold-2);
  margin: 0 0 16px;
}

.page-contact .fb-col h3 {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.3;
  margin: 0 0 14px;
  color: var(--ink);
}

.page-contact .fb-col > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
  margin: 0 0 20px;
}

.page-contact .fb-col-meta {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-contact .fb-col-meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold-2);
  margin-bottom: 5px;
}

.page-contact .fb-col-meta dd {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .fb-col-meta dd:last-child {
  margin-bottom: 0;
}

/* ---------- 02 联系方式 ---------- */
.page-contact .fb-reach {
  position: relative;
  background: var(--deep-2);
  color: var(--on-dark);
  overflow: hidden;
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-contact .fb-reach-figure {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-contact .fb-reach-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}

.page-contact .fb-reach::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(8, 27, 47, 0.86) 0%, rgba(8, 27, 47, 0.97) 100%);
}

.page-contact .fb-reach-inner {
  position: relative;
  z-index: 2;
}

.page-contact .fb-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--aurora);
  margin: 0 0 14px;
}

.page-contact .fb-mail {
  font-family: var(--font-mono);
  font-size: clamp(19px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0 0 22px;
  overflow-wrap: anywhere;
}

.page-contact .fb-copy {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--aurora);
  border: 1px solid var(--aurora);
  padding: 10px 18px;
  cursor: pointer;
  border-radius: 0;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .fb-copy:hover {
  background: transparent;
  color: var(--aurora);
}

.page-contact .fb-copy:focus-visible {
  outline: 2px solid var(--aurora);
  outline-offset: 3px;
}

.page-contact .fb-reach-note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.85;
  color: var(--on-dark-2);
  max-width: 64ch;
}

.page-contact .fb-contact-sub {
  display: grid;
  gap: 28px;
  margin-top: 40px;
  padding-top: 34px;
  border-top: 1px solid rgba(199, 205, 214, 0.18);
}

.page-contact .fb-contact-item .fb-label {
  color: var(--gold);
}

.page-contact .fb-value {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--on-dark);
}

.page-contact .fb-value--mono {
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.page-contact .fb-reach-foot {
  margin: 40px 0 0;
  padding-left: 16px;
  border-left: 1px solid rgba(199, 205, 214, 0.28);
  font-size: 13px;
  line-height: 1.85;
  color: var(--on-dark-3);
  max-width: 70ch;
}

/* ---------- 03 来信模板 ---------- */
.page-contact .fb-tpl {
  background: var(--white);
  color: var(--ink);
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-contact .fb-tpl-order {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .fb-tpl-order li {
  display: flex;
  gap: 16px;
  background: var(--mist);
  padding: 16px 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--rock);
}

.page-contact .fb-tpl-order .mono {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold-2);
  padding-top: 3px;
}

.page-contact .fb-tpl-set {
  display: grid;
  gap: 12px;
}

.page-contact .fb-tpl-box {
  border: 1px solid var(--line);
  background: var(--mist);
}

.page-contact .fb-tpl-box summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

.page-contact .fb-tpl-box summary::-webkit-details-marker {
  display: none;
}

.page-contact .fb-tpl-box summary::before {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--aurora-2);
}

.page-contact .fb-tpl-box[open] summary::before {
  content: "−";
}

.page-contact .fb-tpl-box[open] summary {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.page-contact .fb-tpl-box summary:focus-visible {
  outline: 2px solid var(--aurora-2);
  outline-offset: -2px;
}

.page-contact .fb-pre {
  margin: 0;
  padding: 22px 20px;
  background: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.95;
  color: var(--ink);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  cursor: pointer;
}

.page-contact .fb-pre:focus-visible {
  outline: 2px solid var(--aurora-2);
  outline-offset: -2px;
}

/* ---------- 04 处理流程 ---------- */
.page-contact .fb-flow {
  background: var(--ink);
  color: var(--on-dark);
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-contact .fb-flow-figure {
  margin: 0 0 44px;
  border: 1px solid rgba(199, 205, 214, 0.16);
}

.page-contact .fb-flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 5;
  object-fit: cover;
}

.page-contact .fb-steps {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid rgba(199, 205, 214, 0.22);
}

.page-contact .fb-steps li {
  position: relative;
  padding-bottom: 34px;
}

.page-contact .fb-steps li:last-child {
  padding-bottom: 0;
}

.page-contact .fb-steps li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 9px;
  width: 13px;
  height: 1px;
  background: var(--aurora);
}

.page-contact .fb-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-contact .fb-steps h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--on-dark);
}

.page-contact .fb-steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark-2);
  max-width: 62ch;
}

/* ---------- 05 边界 ---------- */
.page-contact .fb-edge {
  background: var(--mist);
  color: var(--ink);
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-contact .fb-edge-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .fb-edge-col {
  background: var(--white);
  padding: 28px 24px 32px;
}

.page-contact .fb-edge-col h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-contact .fb-edge-col--can h3 {
  color: var(--ink);
}

.page-contact .fb-edge-col--cannot h3 {
  color: var(--rock);
}

.page-contact .fb-edge-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-contact .fb-edge-col li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-contact .fb-edge-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 1px;
  background: var(--gold-2);
}

.page-contact .fb-edge-col--cannot li::before {
  background: var(--line);
}

.page-contact .fb-edge-foot {
  margin: 40px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--rock);
  max-width: 72ch;
}

.page-contact .fb-edge-foot a {
  color: var(--aurora-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-contact .fb-edge-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-contact .fb-contact-sub {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
  }
}

@media (min-width: 900px) {
  .page-contact .fb-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(240px, 4fr);
    gap: 72px;
    align-items: end;
  }

  .page-contact .fb-cols {
    grid-template-columns: 1.15fr 0.85fr 1fr;
  }

  .page-contact .fb-col {
    padding: 34px 28px 38px;
  }

  .page-contact .fb-tpl-order li {
    padding: 18px 24px;
  }

  .page-contact .fb-pre {
    padding: 26px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .fb-copy,
  .page-contact .fb-crumbs a {
    transition: none;
  }
}