.page-contact {
  --co-gap: clamp(22px, 3.4vw, 44px);
  --co-rule: 1px solid var(--ff-line);
  --co-pad: clamp(20px, 2.6vw, 32px);
}

/* ============ 首屏 ============ */
.page-contact .co-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--ff-header-h) + clamp(40px, 7vw, 88px));
  padding-bottom: clamp(48px, 7vw, 92px);
  background:
    radial-gradient(920px 520px at 82% -8%, rgba(255, 106, 30, 0.13), transparent 62%),
    radial-gradient(680px 620px at 4% 96%, rgba(59, 240, 162, 0.07), transparent 66%),
    var(--ff-night);
}

.page-contact .co-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: 12%;
  width: 62%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ff-line) 32%, rgba(255, 106, 30, 0.55));
  transform: rotate(-6deg);
  transform-origin: right center;
  pointer-events: none;
}

.page-contact .co-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.page-contact .co-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.14em;
  color: var(--ff-orange);
  text-transform: uppercase;
}

.page-contact .co-hero__dash {
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--ff-orange);
}

.page-contact .co-hero__title {
  margin: 14px 0 0;
  font-size: clamp(38px, 7.4vw, 76px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--ff-ink);
  transform: skewX(-8deg);
  transform-origin: left bottom;
}

.page-contact .co-hero__intro {
  max-width: 42em;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

.page-contact .co-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-contact .co-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(30px, 4vw, 46px) 0 0;
  border-top: var(--co-rule);
}

.page-contact .co-facts__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 12px 0;
  border-bottom: var(--co-rule);
}

.page-contact .co-facts__label {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.12em;
  color: var(--ff-gray);
}

.page-contact .co-facts__value {
  margin: 0;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  color: var(--ff-ink);
}

.page-contact .co-facts__value .ff-data {
  color: var(--ff-orange);
  font-weight: 700;
}

.page-contact .co-hero__visual {
  margin: 0;
  border: var(--co-rule);
  background: var(--ff-screen);
  position: relative;
}

.page-contact .co-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    repeating-linear-gradient(0deg, rgba(53, 80, 127, 0.22) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(53, 80, 127, 0.22) 0 1px, transparent 1px 34px);
  pointer-events: none;
}

.page-contact .co-hero__visual .ff-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-contact .co-hero__visual .ff-media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 8px 14px;
  background: var(--ff-night);
  border-top: var(--co-rule);
  border-right: var(--co-rule);
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.08em;
  color: var(--ff-ink-2);
}

/* ============ 章节头堆叠变体 ============ */
.page-contact .ff-chapter--stacked {
  display: block;
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-contact .ff-chapter--stacked .ff-chapter__title {
  margin-top: 8px;
}

/* ============ 01 合作方向 ============ */
.page-contact .co-paths {
  background: var(--ff-screen);
  border-top: var(--co-rule);
  border-bottom: var(--co-rule);
}

.page-contact .co-paths__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 26px);
}

.page-contact .co-path {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: var(--co-pad);
  background: var(--ff-night);
  border: var(--co-rule);
  border-radius: var(--ff-radius);
  box-shadow: 0 18px 40px -32px rgba(0, 0, 0, 0.9);
  transition: border-color var(--ff-t) var(--ff-ease), transform var(--ff-t) var(--ff-ease);
}

.page-contact .co-path::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 46px;
  background: var(--ff-orange);
}

.page-contact .co-path:hover,
.page-contact .co-path:focus-within {
  border-color: var(--ff-orange);
  transform: translateY(-3px);
}

.page-contact .co-path__num {
  font-family: var(--ff-font-display);
  font-size: var(--ff-fs-5);
  line-height: 1;
  color: var(--ff-line);
  transform: skewX(-8deg);
}

.page-contact .co-path__title {
  margin: 0;
  font-family: var(--ff-font-head);
  font-weight: 900;
  font-size: var(--ff-fs-4);
  letter-spacing: -0.01em;
  color: var(--ff-ink);
}

.page-contact .co-path__desc {
  margin: 0;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.8;
  color: var(--ff-ink-2);
}

.page-contact .co-path__block {
  padding-top: 14px;
  border-top: var(--co-rule);
}

.page-contact .co-path__label {
  margin: 0 0 8px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.14em;
  color: var(--ff-green);
}

.page-contact .co-path__block--deny .co-path__label {
  color: var(--ff-red);
}

.page-contact .co-path__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.page-contact .co-path__list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.7;
  color: var(--ff-ink-2);
}

.page-contact .co-path__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--ff-mist);
}

.page-contact .co-path__block--deny .co-path__list li::before {
  background: var(--ff-red);
}

/* ============ 02 联系渠道 ============ */
.page-contact .co-liaison {
  position: relative;
}

.page-contact .co-liaison__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 36px);
}

.page-contact .co-board {
  background: var(--ff-board);
  border: var(--co-rule);
  border-radius: var(--ff-radius);
  overflow: hidden;
}

.page-contact .co-board__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(18px, 2.2vw, 26px) var(--co-pad);
  border-bottom: var(--co-rule);
}

.page-contact .co-board__row:last-child {
  border-bottom: 0;
}

.page-contact .co-board__key {
  margin: 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.16em;
  color: var(--ff-gray);
}

.page-contact .co-board__val {
  min-width: 0;
}

.page-contact .co-board__data {
  margin: 0;
  font-family: var(--ff-font-data);
  font-size: clamp(15px, 2.1vw, 20px);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--ff-ink);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .co-board__note {
  margin: 8px 0 0;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.75;
  color: var(--ff-ink-2);
}

.page-contact .co-liaison__note {
  align-self: start;
}

.page-contact .co-liaison__note p {
  margin: 0 0 12px;
}

.page-contact .co-liaison__note p:last-child {
  margin-bottom: 0;
}

/* ============ 03 响应与边界 ============ */
.page-contact .co-bounds {
  border-top: var(--co-rule);
  border-bottom: var(--co-rule);
}

.page-contact .co-bounds__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-contact .co-bound {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "no title"
    "no text";
  column-gap: clamp(14px, 2vw, 22px);
  row-gap: 6px;
  padding: clamp(20px, 2.6vw, 28px) 0;
  border-bottom: var(--co-rule);
}

.page-contact .co-bound__no {
  grid-area: no;
  font-family: var(--ff-font-display);
  font-size: var(--ff-fs-4);
  line-height: 1.1;
  color: var(--ff-mist);
  transform: skewX(-8deg);
}

.page-contact .co-bound--accent .co-bound__no {
  color: var(--ff-orange);
}

.page-contact .co-bound__title {
  grid-area: title;
  margin: 0;
  font-family: var(--ff-font-head);
  font-weight: 800;
  font-size: var(--ff-fs-3);
  color: var(--ff-ink);
}

.page-contact .co-bound__text {
  grid-area: text;
  margin: 0;
  max-width: 46em;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.8;
  color: var(--ff-ink-2);
}

.page-contact .co-bound__text .ff-data {
  color: var(--ff-green);
}

/* ============ 04 合作流程 ============ */
.page-contact .co-flow__figure {
  margin: 0 0 clamp(26px, 3.4vw, 42px);
  border: var(--co-rule);
  background: var(--ff-screen);
}

.page-contact .co-flow__figure .ff-media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .co-flow__figure .ff-media__tag {
  display: block;
  padding: 9px 16px;
  border-top: var(--co-rule);
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.08em;
  color: var(--ff-ink-2);
}

.page-contact .co-flow__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 2.6vw, 30px);
  counter-reset: co-flow;
}

.page-contact .co-flow__step {
  position: relative;
  padding-top: 18px;
  border-top: 2px solid var(--ff-line);
}

.page-contact .co-flow__step::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--ff-orange);
}

.page-contact .co-flow__num {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.16em;
  color: var(--ff-orange);
}

.page-contact .co-flow__title {
  margin: 6px 0 8px;
  font-family: var(--ff-font-head);
  font-weight: 800;
  font-size: var(--ff-fs-4);
  color: var(--ff-ink);
}

.page-contact .co-flow__desc {
  margin: 0;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.78;
  color: var(--ff-ink-2);
}

.page-contact .co-flow__time {
  margin: 12px 0 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-green);
}

/* ============ 05 / 06 材料与疑问 ============ */
.page-contact .co-prep {
  background: var(--ff-screen);
  border-top: var(--co-rule);
}

.page-contact .co-prep__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 4.4vw, 60px);
}

.page-contact .co-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--co-rule);
}

.page-contact .co-list__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 15px 0;
  border-bottom: var(--co-rule);
}

.page-contact .co-list__k {
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-2);
  color: var(--ff-ink);
}

.page-contact .co-list__v {
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.75;
  color: var(--ff-ink-2);
}

.page-contact .co-faq {
  border-bottom: var(--co-rule);
}

.page-contact .co-faq:first-of-type {
  border-top: var(--co-rule);
}

.page-contact .co-faq .ff-details__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-3);
  line-height: 1.4;
  color: var(--ff-ink);
  list-style: none;
}

.page-contact .co-faq .ff-details__summary::-webkit-details-marker {
  display: none;
}

.page-contact .co-faq .ff-details__num {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.1em;
  color: var(--ff-gray);
  flex: none;
}

.page-contact .co-faq[open] .ff-details__num {
  color: var(--ff-orange);
}

.page-contact .co-faq[open] .ff-details__summary {
  color: var(--ff-orange-soft);
}

.page-contact .co-faq .ff-details__body {
  padding: 0 0 18px calc(2em + 12px);
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-2);
  line-height: 1.8;
  color: var(--ff-ink-2);
}

.page-contact .co-faq .ff-details__body p {
  margin: 0;
  max-width: 46em;
}

.page-contact .co-faq .ff-details__summary:focus-visible {
  outline: 2px solid var(--ff-orange);
  outline-offset: 3px;
}

/* ============ 页尾收束 ============ */
.page-contact .co-tail {
  border-top: var(--co-rule);
  background: var(--ff-night);
}

.page-contact .co-tail__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 32px);
  align-items: center;
}

.page-contact .co-tail__text {
  margin: 0;
  max-width: 40em;
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink-2);
}

.page-contact .co-tail__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 响应式 ============ */
@media (min-width: 620px) {
  .page-contact .co-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-contact .co-facts__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 14px 0 16px;
    border-bottom: var(--co-rule);
    border-right: var(--co-rule);
    padding-right: 18px;
  }
  .page-contact .co-facts__item:last-child {
    border-right: 0;
  }
  .page-contact .co-board__row {
    grid-template-columns: minmax(88px, 132px) minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
  .page-contact .co-list__item {
    grid-template-columns: minmax(140px, 180px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
  .page-contact .co-flow__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(22px, 2.6vw, 34px);
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: center;
  }

  .page-contact .co-paths__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
    gap: clamp(18px, 2.2vw, 26px);
  }
  .page-contact .co-path--a {
    grid-column: span 5;
  }
  .page-contact .co-path--b {
    grid-column: span 4;
    margin-top: 44px;
  }
  .page-contact .co-path--c {
    grid-column: span 3;
    margin-top: 88px;
  }

  .page-contact .co-liaison__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
    gap: clamp(28px, 3.4vw, 48px);
  }

  .page-contact .co-bounds__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 3.6vw, 56px);
  }

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

  .page-contact .co-prep__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(36px, 4vw, 64px);
  }

  .page-contact .co-tail__grid {
    grid-template-columns: minmax(0, 7fr) auto;
    justify-content: space-between;
  }
  .page-contact .co-tail__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-contact .co-hero__title {
    font-size: clamp(56px, 5.4vw, 92px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-path {
    transition: none;
  }
  .page-contact .co-path:hover,
  .page-contact .co-path:focus-within {
    transform: none;
  }
}
</main>