.page-contact {
  --contact-shadow: 10px 10px 0 var(--neon);
  --contact-line-soft: rgba(27, 58, 92, 0.55);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-contact .contact-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏分屏 ---------- */
.page-contact .contact-hero {
  padding-top: clamp(20px, 3.4vw, 40px);
}

.page-contact .contact-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-contact .contact-hero-copy h1 {
  font-size: var(--fs-display);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--paper);
}

.page-contact .contact-hero-lede {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .contact-hero-actions {
  margin-top: clamp(22px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .contact-hero-visual {
  position: relative;
  border: 2px solid var(--line);
  background:
    radial-gradient(120% 90% at 10% 50%, rgba(47, 224, 208, 0.14), transparent 62%),
    linear-gradient(160deg, var(--ink-2), var(--ink) 70%);
  padding: clamp(16px, 2.6vw, 28px);
  box-shadow: 8px 8px 0 rgba(47, 224, 208, 0.32);
}

.page-contact .hero-ramp {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 主体：左联系卡 + 右流程 ---------- */
.page-contact .contact-body {
  padding-top: clamp(38px, 6vw, 76px);
}

.page-contact .contact-body-grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 48px);
  align-items: start;
}

.page-contact .contact-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: var(--contact-shadow);
  overflow: hidden;
}

.page-contact .contact-card > img {
  display: block;
  width: 100%;
  height: auto;
  border-bottom: 2px solid var(--ink);
}

.page-contact .contact-card-body {
  padding: clamp(20px, 3vw, 32px);
}

.page-contact .contact-card-body h2 {
  margin: 12px 0 0;
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-contact .contact-card-lede {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: #24405c;
}

.page-contact .channel-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .channel-item {
  padding: 18px 0;
  border-top: 2px solid var(--ink);
}

.page-contact .channel-item:last-child {
  padding-bottom: 0;
}

.page-contact .channel-top {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-contact .channel-no {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon-deep);
  border: 1px solid currentColor;
  padding: 1px 6px;
  line-height: 1.5;
}

.page-contact .channel-top h3 {
  margin: 0;
  font-size: var(--fs-h4);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-contact .channel-item p {
  margin: 10px 0 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: #24405c;
}

.page-contact .copy-row {
  margin-top: 12px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  background: transparent;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.03em;
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.page-contact .copy-value {
  min-width: 0;
  overflow-wrap: anywhere;
}

.page-contact .copy-hint {
  flex: none;
  font-size: var(--fs-note);
  opacity: 0.65;
}

.page-contact .copy-row:hover,
.page-contact .copy-row:focus-visible {
  outline: none;
  background: var(--ink);
  color: var(--neon);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--neon);
}

.page-contact .copy-row:active {
  background: var(--neon-soft);
  color: var(--ink);
}

/* ---------- 右侧流程 ---------- */
.page-contact .flow-side h2 {
  margin: 12px 0 0;
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-contact .flow-lede {
  margin: 14px 0 0;
  max-width: 32em;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .flow-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0 0 0 24px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-contact .flow-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--neon-deep));
}

.page-contact .flow-step {
  position: relative;
  background: var(--ink-2);
  border: 2px solid var(--line);
  padding: 16px 18px 16px 54px;
  transition: border-color 200ms ease, transform 200ms ease, box-shadow 200ms ease;
}

.page-contact .flow-step::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 26px;
  width: 16px;
  height: 2px;
  background: var(--neon);
}

.page-contact .flow-step:hover,
.page-contact .flow-step:focus,
.page-contact .flow-step:focus-within {
  outline: none;
  border-color: var(--neon);
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 rgba(47, 224, 208, 0.28);
}

.page-contact .flow-no {
  position: absolute;
  left: 14px;
  top: 16px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--neon);
}

.page-contact .flow-step h3 {
  margin: 0;
  font-size: var(--fs-h4);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-contact .flow-brief {
  margin: 6px 0 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--neon-soft);
}

.page-contact .flow-more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--mist);
  transition: max-height 240ms ease, opacity 200ms ease, margin-top 200ms ease;
}

.page-contact .flow-step:hover .flow-more,
.page-contact .flow-step:focus .flow-more,
.page-contact .flow-step:focus-within .flow-more {
  max-height: 200px;
  opacity: 1;
  margin-top: 8px;
}

.page-contact .flow-figure {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: 2px solid var(--line);
  background: var(--ink-2);
}

.page-contact .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 写邮件的要领 ---------- */
.page-contact .contact-brief {
  padding-top: clamp(44px, 7vw, 88px);
}

.page-contact .contact-brief-head h2 {
  margin: 12px 0 0;
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-contact .contact-brief-head p {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .brief-list {
  list-style: none;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .brief-item {
  position: relative;
  background: var(--ink-2);
  border: 2px solid var(--line);
  border-left: 2px solid var(--neon);
  padding: 18px 20px;
  transition: border-color 200ms ease, transform 200ms ease;
}

.page-contact .brief-item:hover {
  transform: translateY(-2px);
  border-color: var(--neon);
}

.page-contact .brief-no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-contact .brief-item h3 {
  margin: 8px 0 0;
  font-size: var(--fs-h4);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-contact .brief-item p {
  margin: 8px 0 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .brief-item a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .contact-brief-aside {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .contact-brief-aside a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 备案信息带 ---------- */
.page-contact .contact-registry {
  padding-top: clamp(44px, 7vw, 88px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-contact .registry-band {
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--ink-2);
  padding: clamp(16px, 2.4vw, 22px) clamp(16px, 2.6vw, 26px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 32px;
}

.page-contact .registry-item {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-contact .registry-key {
  font-size: var(--fs-note);
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-contact .registry-val {
  font-size: var(--fs-note);
  line-height: 1.6;
  color: var(--paper);
}

.page-contact .registry-copy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--line);
  padding: 4px 10px;
  font-size: var(--fs-note);
  letter-spacing: 0.06em;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease;
}

.page-contact .registry-hint {
  font-size: 12px;
  color: var(--mist);
}

.page-contact .registry-copy:hover,
.page-contact .registry-copy:focus-visible {
  outline: none;
  border-color: var(--neon);
  color: var(--neon);
  background: rgba(47, 224, 208, 0.08);
}

.page-contact .registry-note {
  flex: 1 1 100%;
  margin: 6px 0 0;
  font-size: var(--fs-note);
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .registry-note a {
  color: var(--neon-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 显现动效 ---------- */
.page-contact [data-reveal="shown"] {
  animation: contactRise 520ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

@keyframes contactRise {
  from {
    opacity: 0.001;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 899px) {
  .page-contact .flow-more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (min-width: 720px) {
  .page-contact .brief-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 960px) {
  .page-contact .contact-body-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact [data-reveal="shown"] {
    animation: none;
  }

  .page-contact .copy-row,
  .page-contact .flow-step,
  .page-contact .flow-more,
  .page-contact .brief-item,
  .page-contact .registry-copy {
    transition: color 120ms linear, background-color 120ms linear;
  }

  .page-contact .copy-row:hover,
  .page-contact .copy-row:focus-visible,
  .page-contact .flow-step:hover,
  .page-contact .flow-step:focus,
  .page-contact .flow-step:focus-within,
  .page-contact .brief-item:hover {
    transform: none;
  }
}