/* ===== 商务合作 /cooperation/ 页面专属样式 ===== */

.page-contact {
  --c-sec-pad: 40px;
  --c-gap: 24px;
  position: relative;
  display: block;
  padding-bottom: 88px;
}

/* ---------- 首屏 ---------- */

.page-contact .c-hero {
  position: relative;
  padding: calc(var(--header-h) + 44px) 0 36px;
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(123, 59, 255, 0.30) 0%, rgba(7, 7, 15, 0) 58%),
    linear-gradient(180deg, var(--void) 0%, var(--void-deep) 100%);
  overflow: hidden;
}

.page-contact .c-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--volt) 28%, var(--neon) 62%, var(--bolt) 88%, transparent 100%);
  opacity: 0.55;
}

.page-contact .c-hero__grid {
  display: grid;
  gap: 30px;
  grid-template-columns: minmax(0, 1fr);
}

.page-contact .c-hero__eyebrow {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--bolt);
  text-transform: uppercase;
}

.page-contact .c-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 20ch;
}

.page-contact .c-hero__intro {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-contact .c-hero__side {
  border: 1px solid var(--line);
  border-left: 2px solid var(--bolt);
  background: rgba(16, 16, 36, 0.74);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.page-contact .c-side__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--volt-soft);
}

.page-contact .c-partners {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-contact .c-partners li {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  background: var(--void);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 5px 11px;
}

.page-contact .c-side__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dim);
  border-top: 1px dashed var(--line);
  padding-top: 14px;
}

/* ---------- 首屏四类方向横向标签 ---------- */

.page-contact .c-quicklinks {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .c-quicklinks a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 16px;
  background: var(--void-deep);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .c-quicklinks a:hover {
  background: var(--haze);
  color: var(--bolt);
}

.page-contact .c-quicklinks .tk-num {
  font-size: 12px;
  color: var(--volt-soft);
}

/* ---------- 主体双栏外壳 ---------- */

.page-contact .c-shell {
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 4px;
}

.page-contact .c-shell__main {
  min-width: 0;
}

.page-contact .c-shell__aside {
  align-self: start;
}

/* ---------- 章节骨架 ---------- */

.page-contact .c-sec {
  padding: var(--c-sec-pad) 0;
}

.page-contact .c-sec + .c-sec {
  border-top: 1px solid var(--line);
}

.page-contact .c-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  margin-bottom: 26px;
}

.page-contact .c-head__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 0.94;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--volt);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-contact .c-head__no {
    color: transparent;
    -webkit-text-stroke: 1px var(--volt);
  }
}

.page-contact .c-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 27px);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-contact .c-head__lead {
  grid-column: 2;
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 62ch;
}

.page-contact .c-sec__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 66ch;
}

/* ---------- 通用小标签 ---------- */

.page-contact .c-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--volt-soft);
  text-transform: uppercase;
}

/* ---------- 合作方向标签切换 ---------- */

.page-contact .c-tabs {
  position: relative;
}

.page-contact .c-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-contact .c-tabs__labels {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-contact .c-tabs__label {
  cursor: pointer;
  user-select: none;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--mist);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-contact .c-tabs__label:hover {
  color: var(--ink);
  border-color: var(--volt-soft);
}

.page-contact #coop-a:checked ~ .c-tabs__labels label[for="coop-a"],
.page-contact #coop-b:checked ~ .c-tabs__labels label[for="coop-b"],
.page-contact #coop-c:checked ~ .c-tabs__labels label[for="coop-c"],
.page-contact #coop-d:checked ~ .c-tabs__labels label[for="coop-d"] {
  color: var(--void);
  background: var(--bolt);
  border-color: var(--bolt);
}

.page-contact #coop-a:focus-visible ~ .c-tabs__labels label[for="coop-a"],
.page-contact #coop-b:focus-visible ~ .c-tabs__labels label[for="coop-b"],
.page-contact #coop-c:focus-visible ~ .c-tabs__labels label[for="coop-c"],
.page-contact #coop-d:focus-visible ~ .c-tabs__labels label[for="coop-d"] {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-contact .c-tabs__panel {
  display: none;
}

.page-contact #coop-a:checked ~ .c-tabs__panels [data-panel="a"],
.page-contact #coop-b:checked ~ .c-tabs__panels [data-panel="b"],
.page-contact #coop-c:checked ~ .c-tabs__panels [data-panel="c"],
.page-contact #coop-d:checked ~ .c-tabs__panels [data-panel="d"] {
  display: block;
}

.page-contact .c-track {
  display: grid;
  gap: 18px;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--bolt);
  border-radius: var(--radius);
}

.page-contact .c-track__who p {
  margin: 8px 0 0;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .c-track__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .c-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-contact .c-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink);
}

.page-contact .c-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--volt);
}

/* ---------- 组件清单 ---------- */

.page-contact .c-kit {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .c-kit__item {
  background: var(--panel);
  padding: 20px;
  transition: background 0.2s var(--ease);
}

.page-contact .c-kit__item:hover {
  background: var(--panel-strong);
}

.page-contact .c-kit__name {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-contact .c-kit__name::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--neon);
  transform: rotate(45deg);
}

.page-contact .c-kit__desc {
  margin: 11px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--mist);
}

.page-contact .c-kit__spec {
  margin: 13px 0 0;
  padding-top: 11px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dim);
}

.page-contact .c-kit__spec span {
  color: var(--volt-soft);
  margin-right: 8px;
}

/* ---------- 配图 ---------- */

.page-contact .c-figure {
  margin: 24px 0 0;
}

.page-contact .c-figure .tk-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .c-figure__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--dim);
}

/* ---------- 四步流程轨道 ---------- */

.page-contact .c-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  grid-template-columns: minmax(0, 1fr);
}

.page-contact .c-flow__step {
  position: relative;
  padding: 24px 20px 22px 0;
}

.page-contact .c-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--volt) 0%, var(--haze) 70%, var(--line) 100%);
}

.page-contact .c-flow__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 14px;
  border: 1px solid var(--volt);
  border-radius: 50%;
  background: rgba(123, 59, 255, 0.14);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--bolt);
}

.page-contact .c-flow__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-contact .c-flow__desc {
  margin: 9px 0 0;
  padding-right: 12px;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--mist);
}

.page-contact .c-flow__extra {
  margin-top: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ink);
}

.page-contact .c-flow__extra > div {
  margin-top: 0;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--neon);
  border-radius: var(--radius);
}

.page-contact .c-flow__extra b {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--neon);
  margin-bottom: 3px;
  margin-top: 10px;
}

.page-contact .c-flow__extra b:first-child {
  margin-top: 0;
}

/* ---------- 数据引用约定 ---------- */

.page-contact .c-specs {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-contact .c-spec {
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s var(--ease);
}

.page-contact .c-spec:hover {
  border-color: var(--haze);
}

.page-contact .c-spec h3 {
  margin: 0 0 9px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--bolt);
}

.page-contact .c-spec p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--mist);
}

/* ---------- 联系渠道 ---------- */

.page-contact .c-channels {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .c-channel {
  background: var(--void-deep);
  padding: 20px;
}

.page-contact .c-channel__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--volt-soft);
  text-transform: uppercase;
}

.page-contact .c-channel__v {
  margin: 11px 0 0;
  font-size: 15px;
  line-height: 1.66;
  color: var(--ink);
  overflow-wrap: break-word;
  word-break: break-word;
}

/* ---------- 服务地区 ---------- */

.page-contact .c-region {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .c-region__item {
  background: var(--panel);
  padding: 18px 20px;
}

.page-contact .c-region__item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 侧栏联系卡 ---------- */

.page-contact .c-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--volt);
  border-radius: var(--radius);
  padding: 22px;
}

.page-contact .c-card__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--bolt);
}

.page-contact .c-card__title {
  margin: 11px 0 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-contact .c-card__list {
  margin: 18px 0 0;
  display: grid;
  gap: 14px;
}

.page-contact .c-card__list > div {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-contact .c-card__list > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .c-card__list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.page-contact .c-card__list dd {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.62;
  color: var(--ink);
  overflow-wrap: break-word;
  word-break: break-word;
}

.page-contact .c-card__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--dim);
}

/* ---------- 响应式 ---------- */

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

  .page-contact .c-specs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-contact .c-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-contact .c-track {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 26px;
    padding: 24px;
  }
}

@media (min-width: 780px) {
  .page-contact .c-quicklinks {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

  .page-contact .c-flow__step {
    padding: 26px 22px 26px 0;
  }
}

@media (min-width: 1000px) {
  .page-contact .c-hero {
    padding: calc(var(--header-h) + 60px) 0 44px;
  }

  .page-contact .c-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
  }
}

@media (min-width: 1080px) {
  .page-contact .c-shell {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 56px;
  }

  .page-contact .c-shell__aside {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-contact .c-sec {
    padding: 48px 0;
  }

  .page-contact .c-head__no {
    font-size: 44px;
  }
}

/* 桌面端悬停展开流程补充信息，窄屏与无悬停设备始终可见 */
@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .page-contact .c-flow__extra {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s var(--ease), opacity 0.24s var(--ease);
  }

  .page-contact .c-flow__step:hover .c-flow__extra,
  .page-contact .c-flow__step:focus-within .c-flow__extra {
    max-height: 260px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .c-quicklinks a,
  .page-contact .c-tabs__label,
  .page-contact .c-kit__item,
  .page-contact .c-spec,
  .page-contact .c-flow__extra {
    transition: none !important;
  }
}