.page-contact {
  --contact-cut: 20px;
  --contact-body: rgba(237, 241, 245, .82);
  display: block;
  background:
    radial-gradient(1100px 560px at 82% -6%, rgba(47, 216, 208, .10), transparent 70%),
    var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  padding-block: clamp(20px, 4vw, 40px) clamp(48px, 8vw, 96px);
  display: grid;
  gap: 32px;
}

.page-contact .contact-h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: clamp(30px, 6.4vw, 46px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-contact .contact-h1::before {
  content: "";
  display: block;
  width: 64px;
  height: 6px;
  margin-bottom: 22px;
  background: linear-gradient(90deg, var(--cyan) 0 60%, var(--amber) 60% 100%);
  transform: skewX(-12deg);
}

.page-contact .hero-lead {
  margin: 20px 0 0;
  max-width: 36ch;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  color: var(--contact-body);
}

.page-contact .hero-copy .annot {
  display: block;
  margin-top: 22px;
  color: var(--cyan-soft);
}

/* ---------- 联系速览卡 ---------- */
.page-contact .quick-card {
  position: relative;
  padding: 26px 22px 22px;
  background: linear-gradient(155deg, rgba(23, 51, 73, .96), rgba(14, 36, 56, .98));
  clip-path: polygon(0 0, calc(100% - var(--contact-cut)) 0, 100% var(--contact-cut), 100% 100%, var(--contact-cut) 100%, 0 calc(100% - var(--contact-cut)));
}

.page-contact .quick-head {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}

.page-contact .quick-list {
  display: grid;
  margin-top: 10px;
}

.page-contact .quick-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--hair-strong);
}

.page-contact .quick-row:last-child {
  border-bottom: 0;
}

.page-contact .quick-key {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-contact .quick-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  color: var(--cyan);
  overflow-wrap: anywhere;
}

.page-contact .quick-value--text {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: var(--cyan-soft);
  line-height: 1.6;
}

.page-contact .quick-foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 渠道区 ---------- */
.page-contact .channel-figure {
  margin: 0 0 30px;
}

.page-contact .channel-grid {
  display: grid;
  gap: 18px;
}

.page-contact .channel-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px 22px 26px;
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--contact-cut)), calc(100% - var(--contact-cut)) 100%, 0 100%);
  transition: transform 180ms var(--ease), background-color 180ms var(--ease);
}

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

.page-contact .channel-card--phone::before {
  background: var(--cyan-soft);
}

.page-contact .channel-card--post::before {
  background: var(--amber);
}

.page-contact .channel-card:hover {
  transform: translateY(-2px);
  background: var(--ink-3);
}

.page-contact .channel-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.page-contact .channel-name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-contact .channel-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--cyan);
  overflow-wrap: anywhere;
}

.page-contact .channel-value--addr {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--amber-soft);
}

.page-contact .channel-body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--contact-body);
}

/* ---------- 回复节奏 ---------- */
.page-contact .rhythm-strip {
  display: grid;
  gap: 1px;
  background: var(--hair-strong);
  border-top: 1px solid var(--hair-strong);
  border-bottom: 1px solid var(--hair-strong);
}

.page-contact .rhythm-step {
  padding: 26px 22px 28px;
  background: var(--ink);
}

.page-contact .rhythm-num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  color: var(--cyan);
  letter-spacing: .04em;
}

.page-contact .rhythm-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}

.page-contact .rhythm-body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--contact-body);
}

.page-contact .notice-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin: 26px 0 0;
  padding: 18px 20px;
  background: rgba(255, 155, 61, .10);
  border-left: 2px solid var(--amber);
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--contact-body);
}

.page-contact .notice-tag {
  flex: none;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber-soft);
}

/* ---------- 提问之前 ---------- */
.page-contact .ask-split {
  display: grid;
  gap: 30px;
}

.page-contact .quick-card--aside .quick-head {
  font-size: 17px;
}

.page-contact .ask-block + .ask-block {
  margin-top: 4px;
}

.page-contact .block-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-contact .block-lead {
  margin: 10px 0 0;
  max-width: 36ch;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .checklist {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-contact .check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  background: rgba(23, 51, 73, .55);
  border-left: 2px solid var(--hair-strong);
  cursor: pointer;
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-contact .check-item:hover {
  border-left-color: var(--cyan);
}

.page-contact .check-item:has(.check-box:checked) {
  border-left-color: var(--cyan);
  background: rgba(47, 216, 208, .10);
}

.page-contact .check-box {
  appearance: none;
  -webkit-appearance: none;
  flex: none;
  width: 18px;
  height: 18px;
  margin: 4px 0 0;
  border: 1.5px solid var(--cyan);
  background: transparent;
  cursor: pointer;
}

.page-contact .check-box:checked {
  background: var(--cyan);
  box-shadow: inset 0 0 0 3px var(--ink-2);
}

.page-contact .check-box:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-contact .check-text {
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--contact-body);
}

.page-contact .check-text strong {
  color: var(--mist);
  font-weight: 700;
}

.page-contact .check-box:checked ~ .check-text {
  color: var(--cyan-soft);
}

.page-contact .slope-rule {
  height: 8px;
  margin: 34px 0 30px;
  background: repeating-linear-gradient(102deg, rgba(47, 216, 208, .6) 0 2px, transparent 2px 14px);
}

.page-contact .topic-list {
  margin-top: 20px;
  border-top: 1px solid var(--hair);
}

.page-contact .topic-item {
  border-bottom: 1px solid var(--hair);
}

.page-contact .topic-item > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 17px 4px;
  cursor: pointer;
  list-style: none;
}

.page-contact .topic-item > summary::-webkit-details-marker {
  display: none;
}

.page-contact .topic-item > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
}

.page-contact .topic-item[open] > summary::after {
  content: "−";
}

.page-contact .topic-item > summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-contact .topic-name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
}

.page-contact .topic-body {
  display: grid;
  gap: 10px;
  padding: 0 4px 20px;
}

.page-contact .topic-body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--contact-body);
}

.page-contact .topic-link {
  justify-self: start;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 216, 208, .45);
  padding-bottom: 2px;
}

.page-contact .topic-link:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

/* ---------- 邮件写法 ---------- */
.page-contact .mail-figure {
  margin: 0 0 28px;
}

.page-contact .mail-split {
  display: grid;
  gap: 20px;
}

.page-contact .mail-card {
  padding: 26px 22px;
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--contact-cut)), calc(100% - var(--contact-cut)) 100%, 0 100%);
}

.page-contact .mail-sample {
  display: block;
  margin: 14px 0 0;
  padding: 13px 14px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--cyan-soft);
  background: rgba(10, 26, 47, .86);
  border-left: 2px solid var(--cyan);
  overflow-wrap: anywhere;
}

.page-contact .mail-steps {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.page-contact .mail-step {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-contact .mail-num {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--amber);
  padding-top: 3px;
}

.page-contact .mail-step-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--contact-body);
}

.page-contact .mail-step-text strong {
  color: var(--mist);
  font-weight: 700;
}

.page-contact .mail-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 216, 208, .45);
}

.page-contact .inline-link:hover {
  color: var(--cyan-soft);
}

/* ---------- 信函寄送 ---------- */
.page-contact .post-panel {
  margin-top: 8px;
  padding: 30px 24px 26px;
  background: linear-gradient(160deg, rgba(255, 155, 61, .10), rgba(14, 36, 56, .96));
  border-left: 2px solid var(--amber);
}

.page-contact .post-list {
  display: grid;
  gap: 22px;
}

.page-contact .post-item {
  display: grid;
  gap: 8px;
}

.page-contact .post-key {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber-soft);
}

.page-contact .post-body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--contact-body);
  overflow-wrap: anywhere;
}

.page-contact .post-note {
  margin: 24px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 浅色收束 ---------- */
.page-contact .breathe {
  margin-top: clamp(64px, 10vw, 120px);
  padding-block: clamp(48px, 8vw, 90px);
  background: var(--mist);
  color: var(--graphite);
}

.page-contact .eyebrow--dark {
  color: #4a5c6e;
}

.page-contact .breathe .section-title {
  color: var(--graphite);
}

.page-contact .breathe-lead {
  margin: 16px 0 0;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(13, 22, 32, .76);
}

.page-contact .breathe-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-contact .breathe-card {
  display: block;
  padding: 24px 20px;
  background: #ffffff;
  border-top: 3px solid var(--cyan);
  text-decoration: none;
  color: var(--graphite);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-contact .breathe-card:nth-child(2) {
  border-top-color: #17b3ad;
}

.page-contact .breathe-card:nth-child(3) {
  border-top-color: var(--amber);
}

.page-contact .breathe-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(10, 26, 47, .12);
}

.page-contact .breathe-card-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  color: var(--graphite);
}

.page-contact .breathe-card-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(13, 22, 32, .72);
}

.page-contact .breathe-foot {
  margin: 34px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(13, 22, 32, .14);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(13, 22, 32, .76);
}

.page-contact .breathe-link {
  margin-left: 12px;
  color: #0f7d78;
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 125, 120, .4);
}

.page-contact .breathe-link:hover {
  color: var(--graphite);
  border-bottom-color: var(--graphite);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .mail-split {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 760px) {
  .page-contact .contact-hero {
    gap: 40px;
  }

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

  .page-contact .rhythm-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .breathe-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .post-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 56px;
  }

  .page-contact .mail-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 24px;
  }
}

@media (min-width: 980px) {
  .page-contact .ask-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }

  .page-contact .ask-aside {
    position: sticky;
    top: 96px;
  }
}