/* ===== 商务合作 /cooperation/ ===== */
.page-contact {
  --co-gap: 24px;
  --co-pad: 28px;
  --co-card: var(--ink-800);
  --co-line: var(--ink-line);
}

/* 面包屑 */
.page-contact .co-crumbs {
  margin-bottom: 22px;
}
.page-contact .co-crumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate-400);
}
.page-contact .co-crumbs li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--ink-line);
}
.page-contact .co-crumbs a {
  color: var(--slate-400);
  text-decoration: none;
  transition: color var(--ease);
}
.page-contact .co-crumbs a:hover,
.page-contact .co-crumbs a:focus-visible {
  color: var(--cyan-400);
}
.page-contact .co-crumbs [aria-current="page"] {
  color: var(--paper-100);
}

/* 首屏 */
.page-contact .co-hero__top {
  display: grid;
  gap: 32px;
}
.page-contact h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 7.4vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--white-000);
}
.page-contact .co-hero__lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-body);
}
.page-contact .co-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 记分牌式关键数字 */
.page-contact .co-score {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--co-line);
  border: 1px solid var(--co-line);
  border-radius: var(--radius-panel);
  overflow: hidden;
}
.page-contact .co-score__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 20px;
  background: var(--co-card);
}
.page-contact .co-score dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}
.page-contact .co-score dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  color: var(--cyan-400);
}

/* 章节通用 */
.page-contact .co-section {
  margin-top: 64px;
}
.page-contact h2 {
  margin: 12px 0 0;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--white-000);
}
.page-contact .co-lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
}

/* 四条合作路径：不平齐的多列瀑布 */
.page-contact .co-paths {
  margin-top: 32px;
  columns: 1;
  column-gap: var(--co-gap);
}
.page-contact .co-path {
  display: block;
  break-inside: avoid;
  margin: 0 0 var(--co-gap);
  padding: var(--co-pad);
  background: var(--co-card);
  border: 1px solid var(--co-line);
  border-radius: var(--radius-panel);
  transition: border-color var(--ease);
}
.page-contact .co-path:hover,
.page-contact .co-path:focus-within {
  border-color: var(--cyan-400);
}
.page-contact .co-path__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--coral-500);
}
.page-contact .co-path h3 {
  margin: 12px 0 0;
  font-size: 22px;
  font-weight: 700;
  color: var(--white-000);
}
.page-contact .co-path__fit {
  margin: 12px 0 0;
}
.page-contact .co-path > p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

/* 折叠详情（合作路径与流程步骤共用） */
.page-contact summary {
  cursor: pointer;
  list-style: none;
}
.page-contact summary::-webkit-details-marker {
  display: none;
}
.page-contact .co-path details,
.page-contact .co-step details {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--co-line);
}
.page-contact .co-path summary,
.page-contact .co-step summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  transition: color var(--ease);
}
.page-contact .co-path summary:hover,
.page-contact .co-step summary:hover {
  color: var(--cyan-400);
}
.page-contact .co-path summary::after,
.page-contact .co-step summary::after {
  content: "展开";
  font-family: var(--font-mono);
  color: var(--cyan-400);
}
.page-contact .co-path details[open] > summary::after,
.page-contact .co-step details[open] > summary::after {
  content: "收起";
}
.page-contact .co-path details > ul,
.page-contact .co-step details > ul {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-contact .co-path details > ul li,
.page-contact .co-step details > ul li {
  position: relative;
  padding-left: 15px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-body);
}
.page-contact .co-path details > ul li::before,
.page-contact .co-step details > ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan-400);
}
.page-contact .co-k {
  color: var(--slate-400);
}

/* 五步流程 */
.page-contact .co-flow__track {
  position: relative;
  display: grid;
  gap: 16px;
  margin-top: 32px;
}
.page-contact .co-step {
  position: relative;
  z-index: 1;
  padding: 22px 20px;
  background: var(--co-card);
  border: 1px solid var(--co-line);
  border-radius: var(--radius-sm);
  transition: border-color var(--ease);
}
.page-contact .co-step:hover,
.page-contact .co-step:focus-within {
  border-color: var(--cyan-400);
}
.page-contact .co-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--cyan-400);
  color: var(--cyan-400);
  font-size: 15px;
}
.page-contact .co-step h3 {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--white-000);
}
.page-contact .co-step > p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

.page-contact .co-figure {
  margin: 32px 0 0;
}

/* 响应时段 */
.page-contact .co-bandwrap {
  margin-top: 30px;
}
.page-contact .co-band {
  position: relative;
  height: 14px;
  border-radius: var(--radius-pill);
  background: var(--ink-700);
  border: 1px solid var(--co-line);
  overflow: hidden;
}
.page-contact .co-band__work {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 37.5%;
  width: 37.5%;
  background: var(--cyan-400);
  opacity: 0.8;
  transition: opacity var(--ease);
}
.page-contact .co-band__scale {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 11px;
  color: var(--slate-400);
}
.page-contact .co-band__tip {
  margin: 14px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate-400);
  opacity: 0.72;
  transition: opacity var(--ease), color var(--ease);
}
.page-contact .co-bandwrap:hover .co-band__work,
.page-contact .co-bandwrap:focus-within .co-band__work {
  opacity: 1;
}
.page-contact .co-bandwrap:hover .co-band__tip,
.page-contact .co-bandwrap:focus-within .co-band__tip {
  opacity: 1;
  color: var(--cyan-400);
}

.page-contact .co-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-contact .co-timeline li {
  position: relative;
  padding-left: 28px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}
.page-contact .co-timeline li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 0.55em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber-400);
}
.page-contact .co-timeline li::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 1.7em;
  bottom: -18px;
  width: 1px;
  background: var(--co-line);
}
.page-contact .co-timeline li:last-child::after {
  display: none;
}
.page-contact .co-timeline strong {
  color: var(--white-000);
  font-weight: 600;
}

/* 协作规模 */
.page-contact .co-scale {
  display: grid;
  gap: 32px;
  margin-top: 30px;
}
.page-contact .co-scale__col {
  min-width: 0;
}
.page-contact .co-leg {
  display: grid;
  gap: 10px;
  padding: 16px 0;
  border-bottom: 1px solid var(--co-line);
}
.page-contact .co-leg:first-child {
  border-top: 1px solid var(--co-line);
}
.page-contact .co-leg__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
}
.page-contact .co-leg__head b {
  color: var(--white-000);
  font-weight: 600;
}
.page-contact .co-leg__head .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  color: var(--cyan-400);
}
.page-contact .co-scale__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-contact .co-cov {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--co-line);
  border: 1px solid var(--co-line);
  border-radius: var(--radius-panel);
  overflow: hidden;
}
.page-contact .co-cov__cell {
  background: var(--co-card);
  padding: 18px;
}
.page-contact .co-cov__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  color: var(--white-000);
}
.page-contact .co-cov__label {
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}

/* 暖纸底联系区块 */
.page-contact .co-contact {
  background: var(--paper-100);
  color: var(--ink-950);
  border-radius: var(--radius-panel);
  padding: 34px 22px;
}
.page-contact .co-contact__label {
  color: var(--ink-700);
}
.page-contact .co-contact h2 {
  color: var(--ink-950);
}
.page-contact .co-contact__grid {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.page-contact .co-contact__item {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--paper-100);
}
.page-contact .co-contact__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-700);
}
.page-contact .co-contact__val {
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink-950);
  word-break: break-word;
  overflow-wrap: anywhere;
}
.page-contact .co-contact__val.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink-950);
}
.page-contact .co-contact__note {
  margin: 22px 0 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-700);
}

/* 常见合作问题 */
.page-contact .co-faq {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}
.page-contact .co-faq details {
  background: var(--co-card);
  border: 1px solid var(--co-line);
  border-radius: var(--radius-sm);
  transition: border-color var(--ease);
}
.page-contact .co-faq details:hover,
.page-contact .co-faq details[open] {
  border-color: var(--cyan-400);
}
.page-contact .co-faq summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--white-000);
}
.page-contact .co-faq summary::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  color: var(--cyan-400);
}
.page-contact .co-faq details[open] > summary::after {
  content: "－";
}
.page-contact .co-faq details > p {
  margin: 0;
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

/* 信任信息条 */
.page-contact .trust-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin-top: 8px;
}
.page-contact .trust-bar__item {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid var(--co-line);
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

/* 桌面端 */
@media (min-width: 760px) {
  .page-contact .co-paths {
    columns: 2;
  }
  .page-contact .co-contact {
    padding: 44px 40px;
  }
  .page-contact .co-contact__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .co-contact__item:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero__top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 40px;
  }
  .page-contact .co-section {
    margin-top: 76px;
  }
  .page-contact .co-flow__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
  }
  .page-contact .co-flow__track::before {
    content: "";
    position: absolute;
    left: 22px;
    right: 22px;
    top: 44px;
    height: 1px;
    background: var(--co-line);
    z-index: 0;
  }
  .page-contact .co-scale {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 40px;
    align-items: start;
  }
  .page-contact .co-figure.media--tall {
    margin-top: 24px;
  }
}

@media (min-width: 1080px) {
  .page-contact .co-contact__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-contact .co-contact__item:last-child {
    grid-column: auto;
  }
}