/* ===== 合作洽谈 · page-contact ===== */
.page-contact {
  --co-gap: clamp(14px, 2vw, 24px);
  --co-pad: clamp(44px, 6.5vw, 96px);
  --co-rule: var(--paper-line);
}

/* ---------- 面包屑 ---------- */
.page-contact > .crumbs {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block: 14px 0;
}

/* ---------- 首屏（暖纸） ---------- */
.page-contact .co-hero {
  padding-block: clamp(26px, 4vw, 48px) var(--co-pad);
  color: var(--ink-text);
}

.page-contact .co-hero__head {
  max-width: 64ch;
}

.page-contact .co-hero__title {
  margin: 14px 0 0;
  max-width: 13em;
  letter-spacing: -0.02em;
}

.page-contact .co-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 66ch;
  color: var(--paper-muted);
  line-height: 1.8;
}

.page-contact .co-hero__lede a,
.page-contact .co-kit__foot a,
.page-contact .co-stage__desc a {
  color: var(--amber-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 0.16s var(--ease);
}

.page-contact .co-hero__lede a:hover,
.page-contact .co-kit__foot a:hover,
.page-contact .co-stage__desc a:hover {
  color: var(--ink-text);
}

/* ---------- 四类合作方向 ---------- */
.page-contact .co-tracks {
  margin-top: clamp(32px, 5vw, 64px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--co-gap);
}

.page-contact .co-track {
  position: relative;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px);
  background: rgba(255, 255, 255, 0.42);
  border-top: 2px solid var(--amber-deep);
  border-radius: 0 0 var(--radius) var(--radius);
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-contact .co-track:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.66);
}

.page-contact .co-track__idx {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--amber-deep);
}

.page-contact .co-track__title {
  margin: 0;
  color: var(--ink-text);
}

.page-contact .co-track__for {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper-muted);
}

.page-contact .co-track__desc {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-text);
}

.page-contact .co-track__out {
  margin: 6px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--co-rule);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-muted);
}

.page-contact .co-track__tag {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--paper-warm);
  background: var(--ink-text);
  border-radius: var(--radius);
}

/* ---------- 首屏配图 ---------- */
.page-contact .co-figure {
  margin: clamp(34px, 5vw, 60px) 0 0;
}

.page-contact .co-figure .media__img,
.page-contact .co-flow__figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-contact .co-figure .media__img {
  border: 1px solid var(--co-rule);
}

.page-contact .co-figure .media__caption,
.page-contact .co-flow__figure .media__caption {
  margin-top: 12px;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.7;
}

.page-contact .co-figure .media__caption {
  color: var(--paper-muted);
}

/* ---------- 对接流程（暗场） ---------- */
.page-contact .co-flow {
  padding-block: var(--co-pad);
  color: var(--paper-warm);
}

.page-contact .co-flow__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-contact .co-rail__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-contact .co-steps {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 10px;
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-contact .co-step {
  flex: 0 0 auto;
}

.page-contact .co-step__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 14px;
  min-width: max-content;
  border-left: 2px solid var(--line-dark);
  background: rgba(12, 31, 27, 0.6);
  color: var(--mist);
  text-decoration: none;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-contact .co-step__link:hover,
.page-contact .co-step__link:focus-visible {
  color: var(--paper-warm);
  border-left-color: var(--amber);
  background: rgba(233, 169, 59, 0.1);
}

.page-contact .co-step__link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-contact .co-step:first-child .co-step__link {
  color: var(--amber);
  border-left-color: var(--amber);
}

.page-contact .co-step__no {
  font-size: 13px;
  color: inherit;
}

.page-contact .co-step__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-contact .co-step__out {
  display: none;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-contact .co-flow__body .lede {
  color: var(--mist);
  max-width: 56ch;
}

.page-contact .co-flow__body > .h2 {
  margin-top: 10px;
  max-width: 16em;
}

/* ---------- 四个阶段 ---------- */
.page-contact .co-stages {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-contact .co-stage {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px) 0 clamp(20px, 2.6vw, 30px) clamp(20px, 3vw, 34px);
  border-left: 1px solid var(--line-dark);
  scroll-margin-top: 120px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-contact .co-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: clamp(26px, 3vw, 36px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-abyss);
  border: 1px solid var(--line-amber);
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-contact .co-stage:hover {
  border-left-color: var(--amber);
  background: linear-gradient(90deg, rgba(233, 169, 59, 0.07), transparent 70%);
}

.page-contact .co-stage:hover::before {
  background: var(--amber);
  transform: scale(1.3);
}

.page-contact .co-stage__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}

.page-contact .co-stage__no {
  font-size: 20px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-contact .co-stage__title {
  margin: 0;
  color: var(--paper-warm);
}

.page-contact .co-stage__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-contact .co-stage__desc a {
  color: var(--cyan);
  text-decoration-color: rgba(70, 224, 212, 0.4);
}

.page-contact .co-stage__desc a:hover {
  color: var(--paper-warm);
}

.page-contact .co-stage__who {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .co-stage__tag {
  display: inline-block;
  margin-right: 10px;
  padding: 1px 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-abyss);
  background: var(--mustard);
  border-radius: var(--radius);
}

.page-contact .co-flow__figure {
  margin: clamp(32px, 4.5vw, 56px) 0 0;
}

.page-contact .co-flow__figure .media__img {
  border: 1px solid var(--line-dark);
}

.page-contact .co-flow__figure .media__caption {
  color: var(--mist);
}

/* ---------- 材料清单（暖纸） ---------- */
.page-contact .co-kit {
  padding-block: var(--co-pad);
  color: var(--ink-text);
}

.page-contact .co-kit__head .lede {
  margin-top: clamp(14px, 2vw, 22px);
  color: var(--paper-muted);
}

.page-contact .co-kit__head > .h2 {
  margin-top: 10px;
  max-width: 18em;
}

.page-contact .co-kit__list {
  list-style: none;
  margin: clamp(28px, 4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--co-gap);
}

.page-contact .co-kit__item {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: clamp(18px, 2.4vw, 26px);
  background: rgba(255, 255, 255, 0.5);
  border-left: 3px solid var(--amber-deep);
  transition: background-color 0.2s var(--ease);
}

.page-contact .co-kit__item:hover {
  background: rgba(255, 255, 255, 0.78);
}

.page-contact .co-kit__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber-deep);
}

.page-contact .co-kit__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.45;
  color: var(--ink-text);
}

.page-contact .co-kit__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-muted);
}

.page-contact .co-kit__foot {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  max-width: 62ch;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-text);
}

/* ---------- 联系与表单（暗场） ---------- */
.page-contact .co-connect {
  padding-block: var(--co-pad);
  color: var(--paper-warm);
  position: relative;
  isolation: isolate;
  background-image:
    linear-gradient(rgba(157, 175, 166, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(157, 175, 166, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
}

.page-contact .co-connect::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(ellipse at 78% 12%, rgba(70, 224, 212, 0.12), transparent 58%);
  pointer-events: none;
}

.page-contact .co-connect__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 60px);
}

.page-contact .co-connect__info .h2 {
  margin-top: 10px;
  max-width: 15em;
}

.page-contact .co-connect__info .lede {
  margin-top: clamp(14px, 2vw, 22px);
  max-width: 52ch;
  color: var(--mist);
}

.page-contact .co-mono {
  margin: clamp(24px, 3vw, 38px) 0 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-contact .co-mono__row {
  display: grid;
  gap: 6px;
  padding: 15px 18px;
  background: var(--pitch-900);
}

.page-contact .co-mono dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-contact .co-mono dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(14.5px, 1.5vw, 17px);
  line-height: 1.95;
  color: var(--paper-warm);
  overflow-wrap: anywhere;
}

.page-contact .co-mono__row--accent dd {
  color: var(--cyan);
}

.page-contact .co-note {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 54ch;
  padding-left: 14px;
  border-left: 2px solid var(--mustard);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 静态意向表 ---------- */
.page-contact .co-form {
  padding: clamp(22px, 3vw, 36px);
  background: var(--pitch-900);
  border: 1px solid var(--pitch-700);
  border-top: 3px solid var(--amber);
  border-radius: var(--radius);
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-contact .co-form__title {
  margin: 0;
  color: var(--paper-warm);
}

.page-contact .co-form__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .co-form__req {
  color: var(--amber);
}

.page-contact .co-field {
  margin: 0;
  padding: 0;
  border: 0;
  display: grid;
  gap: 8px;
}

.page-contact .co-field__label {
  display: block;
  padding: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: 0.02em;
  color: var(--paper-warm);
}

.page-contact .co-field__hint {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-contact .co-choices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.page-contact .co-choice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper-warm);
  border: 1px solid var(--pitch-700);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-contact .co-choice:hover {
  border-color: var(--line-amber);
  background: rgba(233, 169, 59, 0.08);
}

.page-contact .co-choice input {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  accent-color: var(--amber);
}

.page-contact .co-input {
  box-sizing: border-box;
  width: 100%;
  padding: 11px 13px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper-warm);
  background: var(--ink-abyss);
  border: 1px solid var(--pitch-700);
  border-radius: var(--radius);
  transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-contact .co-input--area {
  resize: vertical;
  min-height: 108px;
}

.page-contact .co-input:focus {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
  border-color: var(--amber);
}

.page-contact .co-form__submit {
  justify-self: start;
  margin-top: 4px;
}

.page-contact .co-form__foot {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

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

  .page-contact .co-mono__row {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-contact .co-mono dt {
    letter-spacing: 0.14em;
  }
}

@media (min-width: 760px) {
  .page-contact .co-tracks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-contact .co-flow__split {
    grid-template-columns: minmax(150px, 208px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-contact .co-rail {
    position: sticky;
    top: 120px;
  }

  .page-contact .co-steps {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding-bottom: 0;
  }

  .page-contact .co-step {
    flex: 0 0 auto;
    border-bottom: 1px solid var(--line-dark);
  }

  .page-contact .co-step__link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 12px;
    min-width: 0;
    width: 100%;
    box-sizing: border-box;
    background: transparent;
  }

  .page-contact .co-step__out {
    display: block;
    grid-column: 2;
  }

  .page-contact .co-connect__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }
}

@media (min-width: 1120px) {
  .page-contact .co-connect__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-contact .co-kit__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-track,
  .page-contact .co-stage,
  .page-contact .co-step__link,
  .page-contact .co-choice,
  .page-contact .co-kit__item,
  .page-contact .co-input {
    transition: none;
  }

  .page-contact .co-track:hover {
    transform: none;
  }

  .page-contact .co-stage:hover::before {
    transform: none;
  }
}
<<<END>>>