.page-contact {
  --contact-rail-w: 340px;
  background: var(--bg);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  overflow: hidden;
  padding: 44px 0 46px;
  border-bottom: 1px solid var(--line-dim);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-dim) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-dim) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.5;
  -webkit-mask-image: radial-gradient(130% 92% at 84% 6%, #000 0%, transparent 72%);
  mask-image: radial-gradient(130% 92% at 84% 6%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-contact .contact-hero .container {
  position: relative;
  z-index: 1;
}

.page-contact .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-contact .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .breadcrumb a:hover,
.page-contact .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-contact .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-contact .hero-copy {
  min-width: 0;
}

.page-contact .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-contact .hero-title {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 7.4vw, 3.9rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-contact .hero-title span {
  display: block;
  background: linear-gradient(100deg, var(--cyan) 6%, var(--blue) 60%, var(--orange) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-contact .lede {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .hero-stats {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0 0 28px;
  padding: 20px 0 0;
  border-top: 1px solid var(--line-dim);
}

.page-contact .hero-stats li {
  display: grid;
  gap: 7px;
}

.page-contact .hs-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-contact .hs-label {
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-contact .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.page-contact .ca-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-dim);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .ca-btn:hover,
.page-contact .ca-btn:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-contact .ca-btn--solid {
  color: var(--bg);
  font-weight: 700;
  background: var(--orange);
  border-color: var(--orange);
}

.page-contact .ca-btn--solid:hover,
.page-contact .ca-btn--solid:focus-visible {
  color: var(--bg);
  background: #ffa05f;
  border-color: #ffa05f;
}

.page-contact .hero-media {
  position: relative;
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line-dim);
}

.page-contact .hero-media::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 46px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
  z-index: 2;
}

.page-contact .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-contact .hero-media figcaption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--line-dim);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .hero-media figcaption .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

/* ---------- 主分栏 ---------- */
.page-contact .contact-main {
  padding: 54px 0 76px;
}

.page-contact .contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
}

.page-contact .contact-flow {
  display: grid;
  min-width: 0;
}

.page-contact .c-block {
  margin-bottom: 62px;
  scroll-margin-top: 96px;
}

.page-contact .c-block:last-child {
  margin-bottom: 0;
}

.page-contact .c-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-top: 18px;
  border-top: 2px solid var(--surface-2);
  margin-bottom: 18px;
}

.page-contact .c-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-contact .c-block h2 {
  margin: 0;
  font-size: clamp(1.35rem, 3.6vw, 1.9rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.015em;
  color: var(--ink);
}

.page-contact .c-intro {
  max-width: 64ch;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .c-note {
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--surface);
  border-left: 2px solid var(--blue);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .c-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 214, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .c-note a:hover,
.page-contact .c-note a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- 联系渠道 ---------- */
.page-contact .channel-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .channel-card {
  position: relative;
  display: grid;
  gap: 12px;
  padding: 22px 22px 24px;
  background: var(--surface);
  border: 1px solid var(--line-dim);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-contact .channel-card:hover {
  transform: translateY(-2px);
  border-color: rgba(201, 210, 227, 0.5);
  background: var(--surface-2);
}

.page-contact .channel-card:focus-within {
  border-color: var(--cyan);
}

.page-contact .cc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-contact .cc-tag {
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  border: 1px solid var(--line-dim);
}

.page-contact .cc-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--muted);
}

.page-contact .cc-state .dot {
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
}

.page-contact .channel-card[data-state="online"] .cc-state .dot {
  background: var(--cyan);
}

.page-contact .channel-card[data-state="pending"] .cc-state .dot {
  background: var(--orange);
}

.page-contact .channel-card h3 {
  margin: 4px 0 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-contact .cc-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--cyan);
  word-break: break-word;
}

.page-contact .channel-card[data-state="pending"] .cc-value {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .cc-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .cc-list {
  list-style: none;
  display: grid;
  gap: 9px;
  margin: 4px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-dim);
}

.page-contact .cc-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
}

.page-contact .cc-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--orange);
}

/* ---------- 反馈入口 ---------- */
.page-contact .feedback-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .fb-card {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 24px 22px;
  background: linear-gradient(180deg, var(--deep) 0%, var(--surface) 46%);
  border: 1px solid var(--line-dim);
}

.page-contact .fb-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-contact .fb-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-contact .fb-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .fb-steps {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 4px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-dim);
}

.page-contact .fb-steps li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.page-contact .fb-steps .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

/* ---------- 合作方向 ---------- */
.page-contact .coop-list {
  display: grid;
  border-top: 1px solid var(--line-dim);
}

.page-contact .coop-item {
  border-bottom: 1px solid var(--line-dim);
  transition: background-color var(--dur) var(--ease);
}

.page-contact .coop-item[open] {
  background: var(--surface);
}

.page-contact .coop-item > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 24px;
  gap: 16px;
  align-items: center;
  padding: 20px 4px;
  transition: padding-left var(--dur) var(--ease);
}

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

.page-contact .coop-item > summary:hover {
  padding-left: 12px;
}

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

.page-contact .coop-head {
  display: block;
  min-width: 0;
}

.page-contact .coop-tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-contact .coop-name {
  display: block;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-contact .coop-toggle {
  position: relative;
  display: block;
  width: 16px;
  height: 16px;
  justify-self: end;
}

.page-contact .coop-toggle::before,
.page-contact .coop-toggle::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-contact .coop-toggle::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 1px;
}

.page-contact .coop-toggle::after {
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
}

.page-contact .coop-item[open] .coop-toggle::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-contact .coop-body {
  display: grid;
  gap: 12px;
  padding: 0 4px 26px;
}

.page-contact .coop-body p {
  max-width: 68ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .coop-body h4 {
  margin: 4px 0 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-contact .coop-body ul {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-contact .coop-body li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.page-contact .coop-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 到馆 ---------- */
.page-contact .visit-media {
  margin: 0 0 24px;
  background: var(--surface);
  border: 1px solid var(--line-dim);
}

.page-contact .visit-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-contact .visit-media figcaption {
  padding: 13px 16px;
  border-top: 1px solid var(--line-dim);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .visit-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-dim);
  border: 1px solid var(--line-dim);
}

.page-contact .visit-note {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 20px;
  background: var(--bg);
}

.page-contact .visit-note h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-contact .visit-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 右侧信息栏 ---------- */
.page-contact .contact-rail {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.page-contact .rail-anchors {
  display: flex;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line-dim);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-contact .rail-anchors a {
  flex: none;
  padding: 11px 15px;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
  text-decoration: none;
  border-right: 1px solid var(--line-dim);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-contact .rail-anchors a:last-child {
  border-right: 0;
}

.page-contact .rail-anchors a:hover,
.page-contact .rail-anchors a:focus-visible {
  color: var(--ink);
  background: var(--surface-2);
}

.page-contact .rail-panel {
  display: grid;
  gap: 16px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line-dim);
}

.page-contact .rail-panel--diagram {
  background: linear-gradient(180deg, var(--deep) 0%, var(--surface) 62%);
}

.page-contact .rail-title {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink);
}

.page-contact .rail-title::after {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  margin-top: 10px;
  background: var(--orange);
}

.page-contact .hour-track {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 2px;
}

.page-contact .hour-cell {
  position: relative;
  display: block;
  height: 34px;
  background: var(--surface-2);
  border-top: 2px solid var(--line-dim);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .hour-cell[data-level="normal"] {
  background: rgba(76, 111, 255, 0.13);
  border-top-color: rgba(76, 111, 255, 0.55);
}

.page-contact .hour-cell[data-level="busy"] {
  background: rgba(76, 111, 255, 0.26);
  border-top-color: var(--blue);
}

.page-contact .hour-cell[data-level="peak"] {
  background: rgba(255, 138, 61, 0.28);
  border-top-color: var(--orange);
}

.page-contact .hour-cell:hover {
  background: rgba(47, 243, 214, 0.32);
  border-top-color: var(--cyan);
}

.page-contact .hour-cell::after {
  content: attr(data-hour);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  z-index: 3;
  padding: 4px 7px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line-dim);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

.page-contact .hour-cell:hover::after {
  opacity: 1;
}

.page-contact .hour-axis {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 2px;
  margin-top: -10px;
  font-size: 9.5px;
  letter-spacing: 0.02em;
  text-align: center;
  color: var(--muted);
}

.page-contact .hour-axis .mono {
  font-family: var(--font-mono);
}

.page-contact .rail-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 12px;
  color: var(--muted);
}

.page-contact .rail-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-contact .lg {
  display: block;
  width: 10px;
  height: 10px;
}

.page-contact .lg-normal {
  background: rgba(76, 111, 255, 0.55);
}

.page-contact .lg-busy {
  background: var(--blue);
}

.page-contact .lg-peak {
  background: var(--orange);
}

.page-contact .rail-facts {
  display: grid;
  gap: 14px;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-dim);
}

.page-contact .rail-facts > div {
  display: grid;
  gap: 5px;
}

.page-contact .rail-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-contact .rail-facts dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-contact .entry-diagram {
  display: block;
  width: 100%;
  height: auto;
}

.page-contact .rail-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-contact .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-contact .hero-stats li {
    padding: 0 18px;
    border-left: 1px solid var(--line-dim);
  }

  .page-contact .hero-stats li:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (min-width: 640px) {
  .page-contact .coop-body ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 20px;
  }
}

@media (min-width: 760px) {
  .page-contact .feedback-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-contact .channel-card:first-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 980px) {
  .page-contact .contact-hero {
    padding: 58px 0 56px;
  }

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

  .page-contact .hero-media img {
    aspect-ratio: 9 / 8;
  }
}

@media (min-width: 1040px) {
  .page-contact .contact-main {
    padding: 66px 0 96px;
  }

  .page-contact .contact-layout {
    grid-template-columns: minmax(0, 1fr) var(--contact-rail-w);
    gap: 62px;
    align-items: start;
  }

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