.page-contact {
  --c-line-dark: rgba(243, 245, 249, .13);
  --c-card-line: rgba(10, 12, 18, .14);
  --c-card-muted: #4A5164;
  --c-gap: clamp(46px, 7vw, 104px);
  display: block;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-contact a {
  color: inherit;
}

.page-contact [id] {
  scroll-margin-top: 108px;
}

/* ---------- 面包屑与封面 ---------- */

.page-contact .contact-top {
  padding-top: clamp(22px, 3.4vw, 40px);
}

.page-contact .breadcrumb {
  font-family: var(--font-mono);
  letter-spacing: .08em;
}

.page-contact .contact-cover {
  padding-top: clamp(30px, 5vw, 64px);
}

.page-contact .contact-cover .idx-num {
  color: var(--amber);
}

.page-contact .contact-title {
  margin: .3em 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(52px, 13vw, 140px);
  line-height: .94;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-contact .contact-lead {
  max-width: 34em;
  margin-top: clamp(18px, 2.8vw, 32px);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.9;
  color: rgba(243, 245, 249, .8);
}

.page-contact .contact-cover-media {
  margin: clamp(32px, 5vw, 68px) auto 0;
}

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

/* ---------- 信笺卡 + 常驻索引 ---------- */

.page-contact .contact-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 56px);
  margin-top: clamp(40px, 6vw, 88px);
}

.page-contact .letter {
  position: relative;
  background: var(--paper);
  color: var(--black);
  padding: clamp(30px, 5.4vw, 72px) clamp(20px, 4.4vw, 64px) clamp(28px, 4vw, 56px);
  border: 1px solid var(--c-card-line);
  box-shadow:
    10px 10px 0 -1px rgba(14, 24, 48, .95),
    18px 18px 0 -2px rgba(36, 49, 79, .5),
    0 42px 90px -48px rgba(0, 0, 0, .9);
  transition: transform .42s var(--ease), box-shadow .42s var(--ease);
}

.page-contact .letter::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(10, 12, 18, .16);
  pointer-events: none;
}

.page-contact .letter:hover {
  transform: translateY(-6px);
  box-shadow:
    10px 16px 0 -1px rgba(14, 24, 48, .95),
    18px 28px 0 -2px rgba(36, 49, 79, .5),
    0 58px 110px -48px rgba(0, 0, 0, .92);
}

.page-contact .letter-ridge {
  display: block;
  width: 100%;
  height: 18px;
  color: var(--amber-ink);
  opacity: .6;
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-contact .letter-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-card-muted);
}

.page-contact .letter-title {
  margin: .6em 0 clamp(18px, 2.6vw, 30px);
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--black);
}

.page-contact .channel-list {
  border-top: 1px solid var(--c-card-line);
}

.page-contact .channel {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 20px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--c-card-line);
}

.page-contact .channel-num {
  padding-top: .5em;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--amber-ink);
}

.page-contact .channel-label {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-card-muted);
  text-transform: uppercase;
}

.page-contact .channel-value {
  margin-top: .55em;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.2vw, 23px);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--black);
  word-break: break-word;
}

.page-contact .channel-note {
  max-width: 40em;
  margin-top: .75em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-card-muted);
}

.page-contact .letter-foot {
  margin-top: clamp(20px, 3vw, 30px);
  padding-left: 1.1em;
  border-left: 2px solid var(--amber-ink);
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-card-muted);
}

.page-contact .rail {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-contact .rail-head {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-contact .rail-list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(36, 49, 79, .55);
  text-decoration: none;
  font-size: 14px;
  color: rgba(243, 245, 249, .78);
  transition: color .28s var(--ease), padding-left .28s var(--ease);
}

.page-contact .rail-n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--violet);
}

.page-contact .rail-list a:hover {
  color: var(--cyan);
  padding-left: 6px;
}

/* ---------- 通用章节 ---------- */

.page-contact .contact-sec {
  margin-top: var(--c-gap);
}

.page-contact .sec-lead {
  max-width: 40em;
}

/* ---------- 咨询准备 ---------- */

.page-contact .prepare-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-contact .prep-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-contact .prep-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-bottom: clamp(16px, 2.4vw, 22px);
  border-bottom: 1px solid var(--c-line-dark);
}

.page-contact .prep-num {
  padding-top: .3em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-contact .prep-title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-contact .prep-desc {
  margin-top: .5em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 245, 249, .72);
}

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

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

.page-contact .prepare-caption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 回复时效 ---------- */

.page-contact .timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(26px, 4vw, 46px);
}

.page-contact .step {
  position: relative;
  padding: clamp(22px, 3vw, 32px) clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 24, 48, .92), rgba(6, 11, 24, .55));
}

.page-contact .step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-contact .step-title {
  margin: .75em 0 .5em;
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.page-contact .step-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 245, 249, .74);
}

.page-contact .step-foot {
  margin-top: clamp(16px, 2.4vw, 26px);
  padding-left: 1em;
  border-left: 2px solid var(--violet);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 地域说明 ---------- */

.page-contact .geo {
  padding: clamp(32px, 5vw, 64px) 0;
  border-top: 1px solid var(--c-line-dark);
  border-bottom: 1px solid var(--c-line-dark);
  position: relative;
}

.page-contact .geo .idx-num {
  color: var(--cyan);
}

.page-contact .geo-rule {
  height: 10px;
  margin-bottom: clamp(22px, 3vw, 36px);
  background: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 12px);
  opacity: .75;
}

.page-contact .geo-body {
  max-width: 42em;
  margin-left: auto;
  margin-right: auto;
}

.page-contact .geo-text {
  margin-top: 1.1em;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.95;
  color: rgba(243, 245, 249, .86);
}

/* ---------- 备案与合规 ---------- */

.page-contact .compliance {
  display: grid;
  gap: 20px;
  margin-top: var(--c-gap);
  padding: clamp(24px, 4vw, 46px) clamp(20px, 4vw, 52px);
  background: var(--paper);
  color: var(--black);
  border: 1px solid rgba(10, 12, 18, .1);
}

.page-contact .compliance-label {
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-card-muted);
}

.page-contact .compliance-icp {
  margin-top: .6em;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 19px);
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--black);
  word-break: break-word;
}

.page-contact .compliance-note {
  max-width: 42em;
  margin-top: .7em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-card-muted);
}

.page-contact .compliance-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-contact .compliance-links a {
  display: inline-block;
  padding: 9px 16px;
  font-size: 13px;
  letter-spacing: .04em;
  text-decoration: none;
  border: 1px solid rgba(10, 12, 18, .28);
  transition: background .3s var(--ease), color .3s var(--ease), border-color .3s var(--ease);
}

.page-contact .compliance-links a:hover {
  background: var(--black);
  color: var(--paper);
  border-color: var(--black);
}

/* ---------- 快捷入口 ---------- */

.page-contact .contact-doc-list {
  list-style: none;
  margin: clamp(24px, 3.6vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line-dark);
}

.page-contact .contact-doc-list .doc-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--c-line-dark);
}

.page-contact .contact-doc-list .doc-row-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--violet);
}

.page-contact .contact-doc-list .doc-row-title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
}

.page-contact .contact-doc-list .doc-row-title a {
  display: inline-block;
  text-decoration: none;
  color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

.page-contact .contact-doc-list .doc-row-title a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-contact .contact-doc-list .doc-row-desc {
  max-width: 44em;
  margin: .55em 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 245, 249, .72);
}

.page-contact .contact-doc-list .doc-row-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 断点 ---------- */

@media (min-width: 760px) {
  .page-contact .contact-doc-list .doc-row {
    grid-template-columns: 64px minmax(0, 1fr) auto;
    gap: 22px;
    align-items: center;
  }
}

@media (min-width: 780px) {
  .page-contact .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-contact .step + .step {
    border-left: none;
  }
}

@media (min-width: 860px) {
  .page-contact .prepare-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-contact .contact-stage {
    grid-template-columns: minmax(0, 1fr) 258px;
    align-items: start;
  }

  .page-contact .rail {
    position: sticky;
    top: 104px;
  }
}

@media (max-width: 640px) {
  .page-contact .letter {
    box-shadow:
      6px 6px 0 -1px rgba(14, 24, 48, .95),
      0 30px 64px -42px rgba(0, 0, 0, .9);
  }

  .page-contact .channel-value {
    font-size: 15px;
  }

  .page-contact .channel-note,
  .page-contact .prep-desc,
  .page-contact .step-desc {
    font-size: 14.5px;
  }

  .page-contact .geo-text {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .letter,
  .page-contact .rail-list a,
  .page-contact .compliance-links a,
  .page-contact .contact-doc-list .doc-row-title a {
    transition-duration: .01ms !important;
  }

  .page-contact .letter:hover {
    transform: none;
  }
}