.page-contact {
  --coop-text: #CDE9DF;
  --coop-section-y: clamp(56px, 8vw, 104px);
  --coop-hero-y: clamp(18px, 3vw, 32px);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
}

.page-contact h2,
.page-contact h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--text);
}

.page-contact p {
  overflow-wrap: break-word;
}

.page-contact .section-head {
  max-width: 62ch;
}

.page-contact .section-head h2 {
  margin: 8px 0 0;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.15;
}

.page-contact .kicker {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-contact .coop-hero {
  position: relative;
  overflow: hidden;
  padding: var(--coop-hero-y) 0 var(--coop-section-y);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(99, 245, 210, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 74%);
  border-bottom: 1px solid var(--line);
}

.page-contact .coop-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(167, 243, 208, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(167, 243, 208, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(120% 90% at 72% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 72% 0%, #000 0%, transparent 78%);
  pointer-events: none;
}

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

.page-contact .coop-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-contact .coop-hero h1 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-contact .coop-hero__lede {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--coop-text);
}

.page-contact .coop-hero__quick {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
}

.page-contact .coop-hero__quick li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-contact .coop-hero__quick li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 12px;
  height: 2px;
  background: var(--cyan);
}

.page-contact .coop-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-contact .coop-hero__aside {
  position: relative;
}

.page-contact .coop-hero__figure {
  margin: 0;
}

.page-contact .coop-hero__figure img,
.page-contact .coop-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .contact-card {
  position: relative;
  margin-top: 18px;
  padding: 22px clamp(18px, 3vw, 26px) 20px;
  background: linear-gradient(165deg, var(--panel) 0%, var(--ink-2) 100%);
  border: 1px solid var(--line);
  border-top: 3px solid var(--amber);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
}

.page-contact .contact-card__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-contact .contact-card__list {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-contact .contact-card__list > div {
  display: grid;
  gap: 3px;
}

.page-contact .contact-card__list dt {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-contact .contact-card__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  word-break: break-all;
}

.page-contact .contact-card__list dd a {
  color: var(--cyan);
  text-decoration: none;
}

.page-contact .contact-card__list dd a:hover {
  text-decoration: underline;
}

.page-contact .contact-card__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作方向 ---------- */
.page-contact .coop-directions {
  padding: var(--coop-section-y) 0;
  background: var(--ink);
}

.page-contact .dir-index {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-contact .dir-index__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--ease);
}

.page-contact .dir-index__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--ease);
}

.page-contact .dir-index__no {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-contact .dir-index__body h3 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.25;
}

.page-contact .dir-index__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--coop-text);
}

.page-contact .dir-index__fit {
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-contact .dir-index__fit p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作流程 ---------- */
.page-contact .coop-flow {
  padding: var(--coop-section-y) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  border-top: 1px solid var(--line);
}

.page-contact .coop-flow__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-contact .flow-track {
  list-style: none;
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding: 0;
}

.page-contact .flow-track__step {
  position: relative;
  padding: 26px 22px 26px;
  background: var(--panel);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - 16px),
    calc(100% - 16px) 100%,
    0 100%
  );
  transition: transform var(--ease);
}

.page-contact .flow-track__dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 14px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.page-contact .flow-track__step:nth-child(4) .flow-track__dot {
  background: var(--amber);
}

.page-contact .flow-track__step h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.3;
}

.page-contact .flow-track__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--coop-text);
}

.page-contact .coop-flow__note {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .coop-flow__note a,
.page-contact .coop-faq__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(99, 245, 210, 0.4);
}

.page-contact .coop-flow__note a:hover,
.page-contact .coop-faq__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 服务响应 ---------- */
.page-contact .coop-response {
  padding: var(--coop-section-y) 0;
  background: var(--ink);
}

.page-contact .response-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-contact .response-band__item {
  padding: clamp(22px, 3vw, 30px);
  background: var(--ink-2);
}

.page-contact .response-band__time {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 10px;
  border: 1px solid rgba(255, 200, 87, 0.45);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-contact .response-band__item h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.page-contact .response-band__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--coop-text);
}

/* ---------- 联系与表单 ---------- */
.page-contact .coop-contact {
  padding: var(--coop-section-y) 0;
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-contact .coop-contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-contact .coop-info__list {
  display: grid;
  gap: 18px;
  margin: 0;
}

.page-contact .coop-info__item {
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.page-contact .coop-info__item dt {
  margin-bottom: 4px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-contact .coop-info__item dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
}

.page-contact .coop-info__item dd a {
  font-family: var(--font-mono);
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}

.page-contact .coop-info__item dd a:hover {
  text-decoration: underline;
}

.page-contact .coop-info__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-contact .coop-form {
  padding: clamp(22px, 3.4vw, 34px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(
    0 0,
    calc(100% - 18px) 0,
    100% 18px,
    100% 100%,
    18px 100%,
    0 calc(100% - 18px)
  );
}

.page-contact .coop-form__intro {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-contact .field {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.page-contact .field__label {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--text);
}

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

.page-contact .field input,
.page-contact .field select,
.page-contact .field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 0;
  transition: border-color var(--ease), box-shadow var(--ease);
}

.page-contact .field textarea {
  min-height: 118px;
  resize: vertical;
}

.page-contact .field input::placeholder,
.page-contact .field textarea::placeholder {
  color: rgba(143, 184, 169, 0.8);
}

.page-contact .field input:focus,
.page-contact .field select:focus,
.page-contact .field textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(99, 245, 210, 0.16);
}

.page-contact .field input:not(:placeholder-shown):invalid,
.page-contact .field textarea:not(:placeholder-shown):invalid {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(255, 77, 77, 0.16);
}

.page-contact .field__error {
  display: none;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--red);
}

.page-contact .field:has(input:not(:placeholder-shown):invalid) .field__error,
.page-contact .field:has(textarea:not(:placeholder-shown):invalid) .field__error {
  display: block;
}

.page-contact .coop-form__submit {
  display: inline-flex;
  margin-top: 4px;
}

.page-contact .coop-form__tip {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 常见问题 ---------- */
.page-contact .coop-faq {
  padding: var(--coop-section-y) 0;
  background: var(--ink);
  border-top: 1px solid var(--line);
}

.page-contact .faq-list {
  display: grid;
  gap: 10px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-contact .faq-item {
  background: var(--ink-2);
  border-left: 3px solid var(--line);
  transition: border-color var(--ease), background var(--ease);
}

.page-contact .faq-item[open] {
  border-left-color: var(--cyan);
  background: var(--panel);
}

.page-contact .faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(16px, 2.4vw, 22px);
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

.page-contact .faq-item summary::-webkit-details-marker {
  display: none;
}

.page-contact .faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-contact .faq-item[open] summary::after {
  content: "−";
  color: var(--amber);
}

.page-contact .faq-item__body {
  padding: 0 clamp(16px, 2.4vw, 22px) 20px;
}

.page-contact .faq-item__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--coop-text);
}

.page-contact .coop-faq__note {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-contact .field {
    margin-bottom: 20px;
  }
}

@media (min-width: 860px) {
  .page-contact .dir-index__row {
    grid-template-columns: 86px minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
    padding-inline: 14px;
  }

  .page-contact .dir-index__row:hover {
    background: rgba(99, 245, 210, 0.05);
  }

  .page-contact .dir-index__row:hover::before {
    transform: scaleY(1);
  }

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

@media (min-width: 900px) {
  .page-contact .coop-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-contact .contact-card {
    margin-top: -64px;
    margin-left: clamp(0px, 3vw, 26px);
  }

  .page-contact .flow-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    padding-top: 30px;
  }

  .page-contact .flow-track::before {
    content: "";
    position: absolute;
    top: 0;
    left: 14px;
    right: 14px;
    height: 2px;
    background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 54%, var(--amber) 100%);
    opacity: 0.55;
  }

  .page-contact .flow-track__step:hover {
    transform: translateY(-4px);
  }

  .page-contact .coop-contact__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .dir-index__row,
  .page-contact .dir-index__row::before,
  .page-contact .flow-track__step,
  .page-contact .field input,
  .page-contact .field select,
  .page-contact .field textarea {
    transition: none;
  }

  .page-contact .flow-track__step:hover {
    transform: none;
  }
}