/* ================= 合作与联系 · 页面专属样式 ================= */
.page-contact {
  --cc-line: rgba(62, 90, 122, 0.55);
  --cc-pad: clamp(18px, 3.6vw, 26px);
  --cc-gap: clamp(16px, 2.6vw, 24px);
}

/* ---------- 页首 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(30px, 5vw, 56px);
  background:
    radial-gradient(120% 140% at 6% 0%, rgba(217, 164, 65, 0.14) 0%, rgba(217, 164, 65, 0) 58%),
    radial-gradient(80% 120% at 100% 100%, rgba(79, 179, 168, 0.09) 0%, rgba(79, 179, 168, 0) 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-bottom: 3px solid var(--gold);
  overflow: hidden;
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(62, 90, 122, 0.22) 1px, transparent 1px),
    linear-gradient(0deg, rgba(62, 90, 122, 0.22) 1px, transparent 1px);
  background-size: 72px 72px;
}

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

.page-contact .hero-kicker {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-contact h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.24;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  max-width: 20em;
}

.page-contact .hero-lead {
  margin: 18px 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-contact .hero-metrics {
  list-style: none;
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--cc-line);
  border: 2px solid var(--grid-blue);
}

.page-contact .hero-metrics li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 14px 16px 16px;
  background: var(--ink-800);
}

.page-contact .metric__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.page-contact .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.6vw, 17px);
  letter-spacing: 0.01em;
  color: var(--gold);
  word-break: break-word;
}

.page-contact .hero-visual-wrap {
  position: relative;
  z-index: 1;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-contact .hero-visual {
  margin: 0;
  border: 2px solid var(--grid-blue);
  background: var(--ink-800);
  overflow: hidden;
}

.page-contact .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: clamp(170px, 24vw, 290px);
  object-fit: cover;
}

/* ---------- 章节头 ---------- */
.page-contact .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 24px);
  align-items: start;
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-contact .section-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 5.6vw, 62px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-contact .section-head__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cool);
}

.page-contact .section-head__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.8vw, 30px);
  line-height: 1.32;
  color: var(--text-primary);
}

.page-contact .section-head__desc {
  margin: 12px 0 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- 01 四类合作 ---------- */
.page-contact .coop-grid {
  display: grid;
  gap: var(--cc-gap);
  grid-template-columns: 1fr;
}

.page-contact .coop-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  padding: var(--cc-pad);
  background: var(--ink-700);
  border: 2px solid var(--grid-blue);
  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.page-contact .coop-card:hover,
.page-contact .coop-card:focus-within {
  border-color: var(--gold);
  box-shadow: var(--shadow-hard);
  transform: translate(-2px, -2px);
}

.page-contact .coop-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--cc-line);
}

.page-contact .coop-card__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--gold);
}

.page-contact .coop-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
  color: var(--text-primary);
}

.page-contact .coop-card__facts {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(56px, auto) minmax(0, 1fr);
  gap: 10px 14px;
  font-size: 14px;
}

.page-contact .coop-card__facts dt {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
  white-space: nowrap;
}

.page-contact .coop-card__facts dd {
  margin: 0;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-contact .coop-foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- 02 合作流程 ---------- */
.page-contact .flow {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-contact .flow-step {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-contact .flow-step__dot {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
}

.page-contact .flow-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text-primary);
}

.page-contact .flow-step__meta {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--accent-cool);
}

.page-contact .flow-step__tip {
  position: absolute;
  top: calc(100% + 12px);
  left: 0;
  z-index: 6;
  width: 100%;
  margin: 0;
  padding: 10px 12px;
  background: var(--ink-800);
  border: 2px solid var(--gold);
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.65;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.16s ease, visibility 0.16s ease;
}

.page-contact .flow-step:hover .flow-step__tip,
.page-contact .flow-step:focus-within .flow-step__tip {
  opacity: 1;
  visibility: visible;
}

.page-contact .flow-media {
  margin: clamp(34px, 5vw, 60px) 0 0;
  max-width: 1000px;
}

.page-contact .flow-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 2px solid var(--grid-blue);
  background: var(--ink-700);
  object-fit: cover;
}

.page-contact .flow-media figcaption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---------- 03 联系渠道 ---------- */
.page-contact .channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .channel {
  display: grid;
  gap: 14px;
  min-width: 0;
  padding: var(--cc-pad);
  background: var(--ink-700);
  border: 2px solid var(--grid-blue);
  border-left: 4px solid var(--gold);
  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.page-contact .channel:hover,
.page-contact .channel:focus-within {
  border-color: var(--gold);
  box-shadow: var(--shadow-hard);
  transform: translate(-2px, -2px);
}

.page-contact .channel__main {
  min-width: 0;
}

.page-contact .channel__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}

.page-contact .channel__value {
  margin: 8px 0 0;
  font-size: clamp(15px, 3.6vw, 30px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-contact .channel__value--text {
  font-family: var(--font-body);
  font-size: clamp(16px, 2.4vw, 22px);
}

.page-contact .channel__note {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-contact .copy-btn {
  justify-self: start;
  appearance: none;
  cursor: pointer;
  padding: 10px 18px;
  background: transparent;
  border: 2px solid var(--gold);
  border-radius: var(--radius);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: background-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.page-contact .copy-btn:hover {
  background: var(--gold);
  color: var(--ink-900);
  box-shadow: var(--shadow-hard);
  transform: translate(-2px, -2px);
}

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

/* ---------- 04 咨询准备 ---------- */
.page-contact .prep-wrap {
  padding: var(--cc-pad);
  background: var(--ink-800);
  border: 2px solid var(--grid-blue);
}

.page-contact .prep-picker__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

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

.page-contact .prep-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-contact .prep-tabs label {
  cursor: pointer;
  padding: 9px 14px;
  background: var(--ink-900);
  border: 2px solid var(--grid-blue);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  transition: border-color 0.16s ease, color 0.16s ease, background-color 0.16s ease;
}

.page-contact .prep-tabs label:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.page-contact #prep-content:checked ~ .prep-tabs label[for="prep-content"],
.page-contact #prep-api:checked ~ .prep-tabs label[for="prep-api"],
.page-contact #prep-tech:checked ~ .prep-tabs label[for="prep-tech"],
.page-contact #prep-rule:checked ~ .prep-tabs label[for="prep-rule"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-900);
}

.page-contact #prep-content:focus-visible ~ .prep-tabs label[for="prep-content"],
.page-contact #prep-api:focus-visible ~ .prep-tabs label[for="prep-api"],
.page-contact #prep-tech:focus-visible ~ .prep-tabs label[for="prep-tech"],
.page-contact #prep-rule:focus-visible ~ .prep-tabs label[for="prep-rule"] {
  outline: 2px solid var(--gold-bright);
  outline-offset: 2px;
}

.page-contact .prep-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .prep-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  background: var(--ink-700);
  border-left: 3px solid var(--cc-line);
  color: var(--text-secondary);
  font-size: 14.5px;
  line-height: 1.75;
  transition: border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease;
}

.page-contact #prep-content:checked ~ .prep-list li[data-type~="content"],
.page-contact #prep-api:checked ~ .prep-list li[data-type~="api"],
.page-contact #prep-tech:checked ~ .prep-list li[data-type~="tech"],
.page-contact #prep-rule:checked ~ .prep-list li[data-type~="rule"] {
  background: var(--ink-800);
  border-left-color: var(--gold);
  color: var(--text-primary);
}

.page-contact .prep-num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-contact .prep-foot {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- 05 备案与主体 ---------- */
.page-contact .registry {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--cc-line);
  border: 2px solid var(--grid-blue);
}

.page-contact .registry__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-contact .registry__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.page-contact .registry__val {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  overflow-wrap: anywhere;
}

.page-contact .registry__links {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- 正文链接 ---------- */
.page-contact p a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.16s ease;
}

.page-contact p a:hover,
.page-contact p a:focus-visible {
  color: var(--gold-bright);
}

/* ---------- 返回顶部 ---------- */
.page-contact .back-top-wrap {
  display: flex;
  justify-content: center;
  padding: 0 24px clamp(28px, 4vw, 44px);
}

.page-contact .back-top {
  padding: 10px 18px;
  border: 2px solid var(--grid-blue);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}

.page-contact .back-top:hover,
.page-contact .back-top:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-2px);
}

/* ---------- 渐显 ---------- */
@keyframes cc-lift {
  from {
    opacity: 0.65;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-contact [data-reveal].is-revealed {
  animation: cc-lift 0.3s ease both;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-contact .registry {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (min-width: 760px) {
  .page-contact .channel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
  }

  .page-contact .copy-btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-contact .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact .flow::before {
    content: "";
    position: absolute;
    top: 21px;
    left: 4%;
    right: 4%;
    height: 2px;
    z-index: 0;
    background: linear-gradient(90deg, var(--gold) 0%, var(--grid-blue) 100%);
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-contact [data-reveal].is-revealed {
    animation: none;
  }

  .page-contact .coop-card,
  .page-contact .channel,
  .page-contact .copy-btn,
  .page-contact .back-top,
  .page-contact .prep-tabs label,
  .page-contact .flow-step__tip {
    transition: none;
  }

  .page-contact .coop-card:hover,
  .page-contact .channel:hover,
  .page-contact .copy-btn:hover,
  .page-contact .back-top:hover {
    transform: none;
  }
}