.page-contact {
  --pc-gap: clamp(20px, 3vw, 36px);
  --pc-pad: clamp(20px, 2.8vw, 36px);
}

.page-contact .page-contact__crumb {
  padding-top: clamp(16px, 2.6vw, 28px);
}

/* —— 首屏 —— */
.page-contact .contact-hero {
  padding: clamp(22px, 3vw, 36px) 0 clamp(44px, 6vw, 88px);
}

.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 880px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }
}

.page-contact .contact-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 62px);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-contact .contact-hero__lede {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--moss);
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-contact .contact-hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 18px 24px;
  margin: 36px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-contact .contact-hero__meta dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-contact .contact-hero__meta dd {
  margin: 8px 0 0;
  font-family: var(--font-num);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-contact .contact-hero__media {
  margin: 0;
}

.page-contact .contact-hero__media img,
.page-contact .panel-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* —— 通用区块标题 —— */
.page-contact .channel-head {
  max-width: 62ch;
}

.page-contact .sec-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.8vw, 44px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-wrap: balance;
}

.page-contact .sec-lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--moss);
}

/* —— 双通道切换 —— */
.page-contact .channel-switch {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--pc-gap);
  margin-top: clamp(28px, 4vw, 48px);
}

@media (min-width: 900px) {
  .page-contact .channel-switch {
    grid-template-columns: 290px minmax(0, 1fr);
    align-items: start;
  }
}

.page-contact .channel-rail {
  display: grid;
  gap: 10px;
}

.page-contact .channel-tab {
  --tab-idx: var(--cyan);
  --tab-sub: var(--moss);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "idx name"
    "idx hint";
  column-gap: 14px;
  padding: 16px 18px;
  background: rgba(23, 69, 60, 0.36);
  border-left: 2px solid var(--line);
  border-radius: 2px;
  color: var(--paper);
  text-decoration: none;
  transition:
    background var(--t) var(--ease),
    border-color var(--t) var(--ease),
    color var(--t) var(--ease);
}

.page-contact .channel-tab:hover,
.page-contact .channel-tab:focus-visible {
  background: var(--glass);
  border-left-color: var(--cyan-soft);
  outline: none;
}

.page-contact .channel-switch:not(:has(.channel-panel:target)) .channel-tab[href="#track-coop"],
.page-contact .channel-switch:has(#track-coop:target) .channel-tab[href="#track-coop"],
.page-contact .channel-switch:has(#track-feedback:target) .channel-tab[href="#track-feedback"] {
  background: var(--cyan);
  border-left-color: var(--cyan);
  color: var(--on-accent);
  --tab-idx: rgba(6, 18, 15, 0.62);
  --tab-sub: rgba(6, 18, 15, 0.64);
}

.page-contact .channel-tab__idx {
  grid-area: idx;
  padding-top: 5px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--tab-idx);
}

.page-contact .channel-tab__name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: 0.01em;
}

.page-contact .channel-tab__hint {
  grid-area: hint;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--tab-sub);
}

/* —— 通道面板 —— */
.page-contact .channel-body {
  min-width: 0;
}

.page-contact .channel-panel {
  display: none;
  padding: var(--pc-pad);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 2px;
}

.page-contact .channel-panel:first-child {
  display: block;
}

.page-contact .channel-body:has(.channel-panel:target) .channel-panel {
  display: none;
}

.page-contact .channel-body .channel-panel:target {
  display: block;
}

.page-contact #track-feedback {
  border-top-color: var(--rose);
}

.page-contact .channel-panel__head {
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.page-contact .panel-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-contact .channel-panel__head p {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--moss);
}

.page-contact .panel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--pc-gap);
}

@media (min-width: 760px) {
  .page-contact .panel-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

.page-contact .panel-col {
  min-width: 0;
}

.page-contact .panel-sub {
  margin: 26px 0 0;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

.page-contact .panel-sub:first-child {
  margin-top: 0;
}

.page-contact #track-feedback .panel-sub {
  color: var(--amber);
}

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

.page-contact .check-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper);
}

.page-contact .check-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-contact #track-feedback .check-list li::before {
  border-color: var(--amber);
}

.page-contact .panel-note {
  padding: 20px;
  border-radius: 2px;
}

.page-contact .panel-note p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
}

.page-contact .panel-note p:first-of-type {
  margin-top: 12px;
}

.page-contact .panel-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-contact .panel-note a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

.page-contact .panel-figure {
  margin: 0 0 18px;
}

.page-contact .panel-feedback-hint {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--moss);
}

/* —— 复制按钮 —— */
.page-contact .copy-btn {
  display: inline-block;
  padding: 2px 0;
  font-family: var(--font-num);
  font-size: clamp(15px, 2.2vw, 19px);
  line-height: 1.5;
  color: var(--cyan);
  background: none;
  border: 0;
  border-bottom: 1px dashed var(--line);
  text-align: left;
  word-break: break-word;
  cursor: pointer;
  transition:
    color var(--t) var(--ease),
    background var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.page-contact .copy-btn:hover,
.page-contact .copy-btn:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-contact .copy-btn[data-copied="true"] {
  padding: 2px 8px;
  color: var(--on-accent);
  background: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-contact .copy-btn[data-copied="true"]::after {
  content: " 已复制";
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-contact .copy-btn[data-copied="false"] {
  padding: 2px 8px;
  color: var(--on-accent);
  background: var(--amber);
  border-bottom-color: var(--amber);
}

.page-contact .copy-btn--block {
  display: block;
  width: 100%;
  margin-top: 18px;
  padding: 14px 16px;
  font-size: 12.8px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  background: rgba(43, 243, 196, 0.06);
  border: 1px dashed var(--line);
  border-radius: 2px;
}

.page-contact .copy-btn--block:hover,
.page-contact .copy-btn--block:focus-visible {
  border-color: var(--cyan);
}

/* —— 合作方向 —— */
.page-contact .direction-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(28px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-contact .direction-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-contact .direction-card:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-contact .direction-card:nth-child(2) {
    grid-column: 8 / span 5;
    margin-top: 64px;
  }

  .page-contact .direction-card:nth-child(3) {
    grid-column: 3 / span 8;
    margin-top: 8px;
  }
}

.page-contact .direction-card {
  padding: var(--pc-pad);
  background: linear-gradient(158deg, var(--glass) 0%, var(--ink-2) 72%);
  border-top: 2px solid var(--cyan);
  border-radius: 2px;
  transition: border-color var(--t) var(--ease);
}

.page-contact .direction-card:nth-child(2) {
  border-top-color: var(--cyan-soft);
}

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

.page-contact .direction-card:hover {
  border-top-color: var(--paper);
}

.page-contact .direction-card__no {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-contact .direction-card:nth-child(3) .direction-card__no {
  color: var(--amber);
}

.page-contact .direction-card__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 27px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-contact .direction-list {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
}

.page-contact .direction-list > div {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.page-contact .direction-list dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-contact .direction-list dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

/* —— 合作流程 —— */
.page-contact .flow {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 860px) {
  .page-contact .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
    position: relative;
  }

  .page-contact .flow::before {
    content: "";
    position: absolute;
    top: 11px;
    left: 6px;
    right: 6px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), var(--cyan-soft) 48%, var(--amber) 100%);
    opacity: 0.65;
  }
}

.page-contact .flow-step {
  position: relative;
  min-width: 0;
}

.page-contact .flow-step__no {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--cyan);
  background: var(--ink);
  border: 1px solid var(--cyan);
  border-radius: 50%;
}

.page-contact .flow-step:nth-child(3) .flow-step__no,
.page-contact .flow-step:nth-child(4) .flow-step__no {
  color: var(--amber);
  border-color: var(--amber);
}

.page-contact .flow-step__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-contact .flow-step__desc {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--moss);
}

.page-contact .flow-step details {
  margin-top: 10px;
}

.page-contact .flow-step summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  cursor: pointer;
  transition: color var(--t) var(--ease);
}

.page-contact .flow-step summary::-webkit-details-marker {
  display: none;
}

.page-contact .flow-step summary::after {
  content: "+";
  font-family: var(--font-num);
  font-size: 14px;
  line-height: 1;
}

.page-contact .flow-step details[open] summary::after {
  content: "–";
}

.page-contact .flow-step summary:hover,
.page-contact .flow-step summary:focus-visible {
  color: var(--cyan-soft);
  outline: none;
}

.page-contact .flow-step details p {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper);
}

/* —— 联系方式 —— */
.page-contact .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 40px);
}

@media (min-width: 920px) {
  .page-contact .reach-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    align-items: start;
  }
}

.page-contact .reach-main {
  min-width: 0;
}

.page-contact .reach-list {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-contact .reach-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 640px) {
  .page-contact .reach-row {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-contact .contact-key {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-contact .contact-value {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(16px, 2.2vw, 21px);
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-contact .contact-value--text {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
}

.page-contact .reach-hint {
  display: block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.65;
  letter-spacing: 0;
  color: var(--moss);
}

.page-contact .reach-note {
  max-width: 62ch;
  margin: 28px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

.page-contact .reach-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-contact .reach-note a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

.page-contact .reach-aside {
  padding: 22px;
  background: var(--ink-2);
  border-left: 2px solid var(--amber);
  border-radius: 2px;
}

.page-contact .aside-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-contact .reach-aside p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--moss);
}

.page-contact .reach-links {
  display: grid;
  gap: 10px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-contact .reach-links a {
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-contact .reach-links a:hover,
.page-contact .reach-links a:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
  outline: none;
}

@media (max-width: 520px) {
  .page-contact .copy-btn--block {
    font-size: 12px;
    padding: 12px 12px;
  }

  .page-contact .direction-list > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-tab,
  .page-contact .copy-btn,
  .page-contact .direction-card,
  .page-contact .panel-note a,
  .page-contact .reach-note a,
  .page-contact .reach-links a,
  .page-contact .flow-step summary {
    transition: none;
  }
}