/* ===== 联系我们 / page-contact ===== */
.page-contact {
  --ct-pad: clamp(18px, 3.4vw, 32px);
  --ct-gap: clamp(16px, 2.4vw, 26px);
  --ct-rule: 1px solid var(--line);
  display: block;
  color: var(--paper);
}

.page-contact .sec {
  padding: clamp(34px, 6vw, 78px) 0;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(24px, 4.2vw, 52px);
  padding-bottom: clamp(30px, 5vw, 62px);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  top: clamp(28px, 7vw, 92px);
  right: -18px;
  width: clamp(70px, 14vw, 158px);
  height: 3px;
  background: linear-gradient(90deg, var(--clay), var(--pulse) 58%, var(--gold));
  transform: rotate(-16deg);
  pointer-events: none;
}

.page-contact .crumb {
  margin: 0 0 clamp(20px, 3.6vw, 38px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .09em;
  color: var(--board);
}

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

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

.page-contact .contact-hero__title {
  margin: 14px 0 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 4.2rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-contact .contact-hero .lede {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  max-width: 42ch;
  font-size: clamp(1rem, 1.35vw, 1.14rem);
  line-height: 1.72;
  color: var(--board);
}

/* ---------- 渠道并置 ---------- */
.page-contact .channel-grid {
  display: grid;
  gap: var(--ct-gap);
  margin-top: clamp(30px, 5vw, 56px);
}

.page-contact .channel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 13px;
  padding: var(--ct-pad);
  padding-left: calc(var(--ct-pad) + 4px);
  background: var(--layer);
  border: var(--ct-rule);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .channel::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background: var(--pulse);
}

.page-contact .channel:hover {
  border-color: var(--board);
}

.page-contact .channel__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--pulse);
}

.page-contact .channel__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  font-weight: 600;
  color: var(--paper);
}

.page-contact .channel__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(.9rem, 1.15vw, 1.02rem);
  letter-spacing: .05em;
  line-height: 1.55;
  color: var(--flash);
  overflow-wrap: anywhere;
}

.page-contact .channel__note {
  margin: 0;
  max-width: 34ch;
  font-size: .88rem;
  line-height: 1.68;
  color: var(--board);
}

.page-contact .channel__jump {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease);
}

.page-contact .channel__jump:hover,
.page-contact .channel__jump:focus-visible {
  border-bottom-color: var(--pulse);
}

.page-contact .copy-btn {
  margin-top: auto;
  align-self: flex-start;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--pulse);
  background: transparent;
  border: 1px solid var(--pulse);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .copy-btn:hover {
  background: var(--pulse);
  color: var(--pulse-ink);
}

.page-contact .copy-btn[data-copied="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--pulse-ink);
}

.page-contact .copy-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-contact .site-mark {
  width: min(190px, 100%);
  height: auto;
  margin: 2px 0 0;
}

.page-contact .site-mark__wire {
  fill: none;
  stroke: var(--line);
  stroke-width: 2;
}

.page-contact .site-mark__dot {
  fill: var(--pulse);
}

.page-contact .site-mark__text {
  fill: var(--board);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-anchor: middle;
}

/* ---------- 场景图 ---------- */
.page-contact .contact-scene {
  margin: clamp(28px, 4.6vw, 52px) 0 0;
}

.page-contact .contact-scene img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 区块通用 ---------- */
.page-contact .contact-collab {
  border-top: var(--ct-rule);
}

.page-contact .sec-head {
  max-width: 64ch;
}

.page-contact .sec-head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-contact .sec-head .prose {
  margin-top: clamp(14px, 2vw, 22px);
  max-width: 46ch;
  font-size: .95rem;
  line-height: 1.74;
  color: var(--board);
}

/* ---------- 邮件标题模板 ---------- */
.page-contact .mail-template {
  position: relative;
  overflow: hidden;
  margin-top: clamp(24px, 3.6vw, 40px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--layer);
  border: var(--ct-rule);
  border-left: 3px solid var(--gold);
}

.page-contact .mail-template__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-contact .mail-template__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.4vw, 1.6rem);
  letter-spacing: .06em;
  color: var(--flash);
  overflow-wrap: anywhere;
}

.page-contact .mail-template::after {
  content: "";
  position: absolute;
  inset: 0 -6px 0 auto;
  width: 84px;
  background: repeating-linear-gradient(-45deg, rgba(240, 180, 41, 0) 0 7px, rgba(240, 180, 41, .16) 7px 8px);
  pointer-events: none;
}

/* ---------- 需求类型折叠 ---------- */
.page-contact .req-list {
  display: grid;
  gap: 8px;
  margin-top: clamp(18px, 2.8vw, 30px);
}

.page-contact .req {
  background: transparent;
  border: var(--ct-rule);
  transition: background var(--dur) var(--ease);
}

.page-contact .req[open] {
  background: var(--layer);
}

.page-contact .req__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px clamp(14px, 2.4vw, 22px);
  list-style: none;
  cursor: pointer;
  font-size: .95rem;
  color: var(--paper);
}

.page-contact .req__head::-webkit-details-marker {
  display: none;
}

.page-contact .req__head:focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: -2px;
}

.page-contact .req__key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--pulse);
}

.page-contact .req__title {
  font-weight: 600;
}

.page-contact .req__plus {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--board);
}

.page-contact .req__plus::after {
  content: "+";
}

.page-contact .req[open] .req__plus {
  color: var(--pulse);
}

.page-contact .req[open] .req__plus::after {
  content: "–";
}

.page-contact .req__body {
  padding: 0 clamp(14px, 2.4vw, 22px) 18px;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--board);
}

.page-contact .req__body p {
  margin: 0 0 8px;
  max-width: 48ch;
}

.page-contact .req__body p:last-child {
  margin-bottom: 0;
}

.page-contact .req__body a {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 协作邮件示意图 ---------- */
.page-contact .contact-shot {
  margin: clamp(28px, 4.6vw, 50px) 0 0;
}

.page-contact .contact-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06);
}

/* ---------- 流转横带 ---------- */
.page-contact .flow-row {
  display: flex;
  gap: 2px;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-contact .flow-step {
  flex: 0 0 min(228px, 72vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  background: var(--layer);
  border-top: 2px solid var(--line);
}

.page-contact .flow-step:first-child {
  border-top-color: var(--pulse);
}

.page-contact .flow-step__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-contact .flow-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-contact .flow-step__note {
  margin: 0;
  font-size: .82rem;
  line-height: 1.62;
  color: var(--board);
}

/* ---------- 常见投递错误 ---------- */
.page-contact .mistakes {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--ct-rule);
}

.page-contact .mistake {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--layer);
  border-left: 2px solid var(--clay);
}

.page-contact .mistake__code {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--board);
}

.page-contact .mistake__text {
  margin: 0;
  max-width: 56ch;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 备案细条 ---------- */
.page-contact .contact-filing-wrap {
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-contact .contact-filing {
  padding: clamp(18px, 3vw, 28px);
  border: var(--ct-rule);
  border-top: 2px solid var(--clay);
  scroll-margin-top: 110px;
}

.page-contact .filing-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-contact .filing-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
}

.page-contact .filing-row {
  display: grid;
  gap: 4px;
  padding: 13px clamp(12px, 2vw, 18px);
  background: var(--ink);
}

.page-contact .filing-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--board);
}

.page-contact .filing-val {
  font-size: .95rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-contact .filing-note {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: .82rem;
  line-height: 1.66;
  color: var(--board);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-contact .channel--phone {
    margin-top: 14px;
  }

  .page-contact .channel--addr {
    margin-top: 28px;
  }

  .page-contact .contact-scene img {
    aspect-ratio: 21 / 8;
  }

  .page-contact .mistake {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-contact .filing-row {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }

  .page-contact .flow-step {
    flex: 0 0 236px;
  }
}

@media (min-width: 1120px) {
  .page-contact .contact-hero .lede {
    max-width: 38ch;
  }

  .page-contact .flow-step {
    flex: 1 1 0;
  }

  .page-contact .flow-row {
    overflow-x: visible;
  }
}