.page-contact {
  --c-gap: clamp(56px, 8vw, 116px);
  --c-card-pad: clamp(20px, 2.6vw, 30px);
  --c-paper-ink: #16202F;
  --c-paper-ink-soft: #46536A;
  padding-bottom: clamp(64px, 8vw, 112px);
}

/* ---------- 首屏：红蓝对撞 ---------- */
.page-contact .contact-hero {
  display: grid;
  gap: 0;
  margin-top: 20px;
}

.page-contact .hero-red,
.page-contact .hero-blue {
  padding: clamp(24px, 4.4vw, 44px);
  color: var(--white);
}

.page-contact .hero-red {
  background: var(--red);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-contact .hero-blue {
  background: var(--blue);
  margin-top: -1px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 28px 100%, 0 calc(100% - 28px));
}

.page-contact .hero-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 247, 250, 0.82);
}

.page-contact h1 {
  margin: 0;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 16em;
}

.page-contact .hero-lede {
  margin: 18px 0 0;
  max-width: 42em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(245, 247, 250, 0.94);
}

.page-contact .hero-picks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .hero-picks a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 15px;
  background: rgba(11, 18, 32, 0.3);
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-contact .hero-picks a::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
  flex: none;
}

.page-contact .hero-picks a:hover,
.page-contact .hero-picks a:focus-visible {
  background: rgba(11, 18, 32, 0.5);
  transform: translateX(4px);
}

.page-contact .hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .hero-cta .btn {
  border-color: rgba(245, 247, 250, 0.75);
  color: var(--white);
}

.page-contact .hero-cta .btn:hover,
.page-contact .hero-cta .btn:focus-visible {
  background: rgba(245, 247, 250, 0.14);
}

/* ---------- 区块节奏 ---------- */
.page-contact .c-section {
  margin-top: var(--c-gap);
}

.page-contact .section-head {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-contact .section-title {
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

/* ---------- 三条渠道 ---------- */
.page-contact .channel-grid {
  display: grid;
  gap: 14px;
}

.page-contact .channel {
  position: relative;
  padding: calc(var(--c-card-pad) + 10px) var(--c-card-pad) var(--c-card-pad);
  background: var(--ink-2);
  display: flex;
  flex-direction: column;
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-contact .channel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: var(--red);
}

.page-contact .channel--blue::before {
  background: var(--blue);
}

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

.page-contact .channel:hover,
.page-contact .channel:focus-within {
  transform: translateY(-6px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.28);
}

.page-contact .channel-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-contact .channel-name {
  margin: 0 0 14px;
  font-size: 21px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .channel-value {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.5;
  color: var(--cyan);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .channel--cyan .channel-value {
  color: var(--white);
  font-size: clamp(14px, 1.7vw, 16px);
}

.page-contact .channel-fit {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .channel-meta {
  margin: auto 0 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-contact .channel-copy,
.page-contact .channel-jump {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.14s var(--ease), color 0.14s var(--ease);
}

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

.page-contact .channel-jump::after {
  content: "→";
}

/* ---------- 准备清单 ---------- */
.page-contact .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .check {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  background: var(--ink-2);
  cursor: pointer;
  transition: background 0.16s var(--ease);
}

.page-contact .check:hover {
  background: #16233A;
}

.page-contact .check input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-contact .check-box {
  width: 24px;
  height: 24px;
  margin-top: 2px;
  display: grid;
  place-items: center;
  border: 2px solid #3A4D6B;
  background: transparent;
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-contact .check-box::after {
  content: "✓";
  font-size: 14px;
  line-height: 1;
  color: var(--ink);
  opacity: 0;
  transition: opacity 0.14s var(--ease);
}

.page-contact .check input:checked + .check-box {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-contact .check input:checked + .check-box::after {
  opacity: 1;
}

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

.page-contact .check-label strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-contact .check-label span {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-contact .prep-note {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--red);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 到馆 ---------- */
.page-contact .visit-grid {
  display: grid;
  gap: 22px;
}

.page-contact .visit-main .figure {
  margin: 0 0 22px;
}

.page-contact .visit-grid .figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .visit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .visit-list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-contact .visit-list li:first-child {
  border-top: 1px solid var(--line);
}

.page-contact .visit-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-contact .visit-val {
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
}

.page-contact .visit-side {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-contact .paper-panel.visit-card {
  color: var(--c-paper-ink);
  padding: var(--c-card-pad);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-contact .visit-card-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-paper-ink-soft);
}

.page-contact .visit-card-addr {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.8vw, 16px);
  line-height: 1.7;
  font-weight: 700;
  color: var(--c-paper-ink);
}

.page-contact .visit-card-dl {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-contact .visit-card-dl > div {
  display: grid;
  grid-template-columns: 5.2em 1fr;
  gap: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(22, 32, 47, 0.25);
}

.page-contact .visit-card-dl dt {
  font-size: 13px;
  color: var(--c-paper-ink-soft);
}

.page-contact .visit-card-dl dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  font-weight: 700;
  color: var(--c-paper-ink);
  word-break: break-word;
}

/* ---------- 合作 ---------- */
.page-contact .coop-wrap {
  display: grid;
  gap: 22px;
}

.page-contact .coop-card {
  background: var(--ink-2);
  border-left: 4px solid var(--red);
  padding: var(--c-card-pad);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-contact .coop-list {
  list-style: none;
  counter-reset: coop;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-contact .coop-list li {
  counter-increment: coop;
  position: relative;
  padding-left: 46px;
}

.page-contact .coop-list li::before {
  content: counter(coop, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--red);
}

.page-contact .coop-list strong {
  display: block;
  margin-bottom: 5px;
  font-size: 15.5px;
  color: var(--white);
}

.page-contact .coop-list span {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .coop-side {
  padding: var(--c-card-pad);
  background: var(--blue);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-contact .coop-side-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 247, 250, 0.82);
}

.page-contact .coop-side-text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 247, 250, 0.95);
  word-break: break-word;
}

.page-contact .coop-side .btn--red {
  background: var(--white);
  color: var(--blue);
  border-color: var(--white);
}

.page-contact .coop-side .btn--red:hover,
.page-contact .coop-side .btn--red:focus-visible {
  background: var(--ink);
  color: var(--white);
  border-color: var(--ink);
}

/* ---------- 响应时段 ---------- */
.page-contact .response-grid {
  display: grid;
  gap: 26px;
}

.page-contact .resp-list {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .resp-list li {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 14px;
  align-items: start;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .resp-list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--white);
  font-size: 15.5px;
}

.page-contact .resp-dot {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  transform: rotate(45deg);
  background: var(--muted);
}

.page-contact .resp-dot--cyan { background: var(--cyan); }
.page-contact .resp-dot--amber { background: var(--amber); }
.page-contact .resp-dot--red { background: var(--red); }
.page-contact .resp-dot--blue { background: var(--blue); }

.page-contact .quick {
  padding: 20px 22px;
  background: var(--ink-2);
  border-left: 3px solid var(--cyan);
}

.page-contact .quick-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .quick-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-contact .quick-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  color: var(--white);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.6;
  border-bottom: 1px solid var(--line);
  transition: color 0.14s var(--ease);
}

.page-contact .quick-links li:last-child a {
  border-bottom: 0;
}

.page-contact .quick-links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--muted);
  flex: none;
  transition: color 0.14s var(--ease), transform 0.14s var(--ease);
}

.page-contact .quick-links a:hover,
.page-contact .quick-links a:focus-visible {
  color: var(--cyan);
}

.page-contact .quick-links a:hover::after,
.page-contact .quick-links a:focus-visible::after {
  color: var(--cyan);
  transform: translateX(3px);
}

.page-contact .ask-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-contact .fold {
  background: var(--ink-2);
  margin-bottom: 10px;
}

.page-contact .fold-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  background: transparent;
  border: 0;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  text-align: left;
  cursor: pointer;
  transition: color 0.14s var(--ease);
}

.page-contact .fold-head:hover,
.page-contact .fold-head:focus-visible {
  color: var(--cyan);
}

.page-contact .fold-icon {
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  transition: transform 0.24s var(--ease);
}

.page-contact .fold-head[aria-expanded="true"] .fold-icon {
  transform: rotate(180deg);
}

.page-contact .fold-panel {
  padding: 0 18px 18px;
}

.page-contact .fold-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-contact .checklist {
    grid-template-columns: 1fr 1fr;
    gap: 12px 16px;
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-contact .hero-blue {
    margin-top: 40px;
    margin-left: -1px;
    min-height: 100%;
  }

  .page-contact .channel-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-contact .visit-grid {
    grid-template-columns: 1.3fr 0.7fr;
    gap: 32px;
    align-items: start;
  }

  .page-contact .coop-wrap {
    grid-template-columns: 1.35fr 0.65fr;
    gap: 28px;
    align-items: stretch;
  }

  .page-contact .response-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-contact .visit-list li {
    grid-template-columns: 6.5em 1fr;
    gap: 18px;
    align-items: baseline;
  }
}