.page-contact {
  --ct-gap: clamp(24px, 3.4vw, 46px);
  --ct-cut: 28px;
  display: block;
  background: var(--ink-950);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(96px, 15vh, 158px) 0 clamp(44px, 6vw, 76px);
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan) 42%, transparent 88%);
  opacity: 0.72;
  pointer-events: none;
}

.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ct-gap);
  align-items: start;
}

.page-contact .contact-hero__index {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 18px 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--green);
}

.page-contact .contact-hero__index::after {
  content: "";
  flex: 0 1 210px;
  height: 1px;
  background: linear-gradient(90deg, var(--green), transparent);
}

.page-contact .contact-hero__title {
  margin: 0 0 22px;
  font-size: clamp(2.25rem, 5.4vw, 4.4rem);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-contact .contact-hero__lead {
  margin: 0 0 clamp(26px, 3vw, 38px);
  max-width: 40em;
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  line-height: 1.8;
  color: var(--text);
}

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

.page-contact .contact-hero__figure .media-frame__img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-contact .contact-hero__figure .media-frame__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 联络面板 ---------- */
.page-contact .contact-card {
  position: relative;
  isolation: isolate;
  background: linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 62%, var(--ink-950) 100%);
  clip-path: polygon(0 0, calc(100% - var(--ct-cut)) 0, 100% var(--ct-cut), 100% 100%, var(--ct-cut) 100%, 0 calc(100% - var(--ct-cut)));
  overflow: hidden;
}

.page-contact .contact-card__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  z-index: 0;
  pointer-events: none;
}

.page-contact .contact-card__body {
  position: relative;
  z-index: 1;
  padding: clamp(24px, 3vw, 34px);
}

.page-contact .contact-card__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-contact .contact-card__title {
  margin: 0;
  font-size: clamp(1.35rem, 2.2vw, 1.7rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-contact .contact-card__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-contact .contact-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .contact-line__key {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-contact .contact-line__copy {
  grid-column: 2;
  grid-row: 1;
  align-self: start;
}

.page-contact .contact-line__value {
  grid-column: 1 / -1;
  grid-row: 2;
  font-family: var(--font-mono);
  font-size: clamp(0.88rem, 1.55vw, 1rem);
  letter-spacing: 0.02em;
  color: var(--white);
  word-break: break-all;
}

.page-contact .contact-line__value a {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 209, 255, 0.42);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .contact-line__value a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.page-contact .contact-line__value--plain {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  word-break: normal;
}

.page-contact .contact-line__note {
  grid-column: 1 / -1;
  grid-row: 3;
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
}

@media (hover: hover) {
  .page-contact .contact-line:hover {
    background: rgba(22, 208, 124, 0.07);
  }
  .page-contact .contact-line__value a:hover {
    color: var(--green);
    border-color: var(--green);
  }
}

/* ---------- 反馈材料 ---------- */
.page-contact .contact-prep__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 2.6vw, 30px);
  align-items: start;
}

.page-contact .feedback-board {
  position: relative;
  padding: clamp(22px, 3vw, 34px);
  background: linear-gradient(178deg, rgba(18, 36, 56, 0.94), rgba(13, 27, 42, 0.94));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-contact .feedback-board__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-contact .checklist {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .checklist__item {
  position: relative;
}

.page-contact .checklist__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-contact .checklist__label {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  background: rgba(10, 20, 32, 0.58);
  border-left: 3px solid var(--orange);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .checklist__mark {
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border: 2px solid var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .checklist__mark::after {
  content: "";
  width: 10px;
  height: 5px;
  border-left: 2px solid var(--ink-950);
  border-bottom: 2px solid var(--ink-950);
  transform: rotate(-45deg) scale(0);
  transition: transform 140ms var(--ease);
}

.page-contact .checklist__text {
  display: block;
  min-width: 0;
}

.page-contact .checklist__title {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-contact .checklist__desc {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--text);
}

.page-contact .checklist__input:checked + .checklist__label {
  border-left-color: var(--green);
  background: rgba(22, 208, 124, 0.08);
}

.page-contact .checklist__input:checked + .checklist__label .checklist__mark {
  background: var(--green);
  border-color: var(--green);
}

.page-contact .checklist__input:checked + .checklist__label .checklist__mark::after {
  transform: rotate(-45deg) scale(1);
}

.page-contact .checklist__input:focus-visible + .checklist__label {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

@media (hover: hover) {
  .page-contact .checklist__label:hover {
    transform: translateX(2px);
    background: rgba(18, 36, 56, 0.85);
  }
}

.page-contact .feedback-board__ready {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--green);
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .feedback-board:has(#fb-browser:checked):has(#fb-shot:checked):has(#fb-time:checked):has(#fb-steps:checked) .feedback-board__ready {
  opacity: 1;
  transform: none;
}

/* ---------- 排查次序 ---------- */
.page-contact .prep-aside {
  padding: clamp(22px, 2.8vw, 30px);
  background: rgba(18, 36, 56, 0.55);
  border-top: 2px solid var(--green-deep);
}

.page-contact .prep-aside__title {
  margin: 0 0 18px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-contact .prep-aside__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: prep;
}

.page-contact .prep-aside__item {
  counter-increment: prep;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
}

.page-contact .prep-aside__item::before {
  content: counter(prep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-top: 5px;
}

.page-contact .prep-aside__link {
  display: inline-block;
  margin-top: 22px;
  font-size: 14px;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 208, 124, 0.5);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .prep-aside__link:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

@media (hover: hover) {
  .page-contact .prep-aside__link:hover {
    color: var(--white);
    border-color: var(--white);
  }
}

/* ---------- 处理流程 ---------- */
.page-contact .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
}

.page-contact .flow-step {
  position: relative;
  padding: clamp(24px, 2.8vw, 34px);
  background: rgba(13, 27, 42, 0.92);
}

.page-contact .flow-step::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-contact .flow-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--green);
  margin-bottom: 12px;
}

.page-contact .flow-step__title {
  margin: 0 0 10px;
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--white);
  letter-spacing: -0.005em;
}

.page-contact .flow-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 纠错与合作 ---------- */
.page-contact .coop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2vw, 22px);
}

.page-contact .coop-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 2.6vw, 30px);
  background: linear-gradient(166deg, rgba(18, 36, 56, 0.95), rgba(10, 20, 32, 0.95));
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  transition: transform var(--dur) var(--ease);
}

.page-contact .coop-card__num {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--amber);
}

.page-contact .coop-card__title {
  margin: 0 0 12px;
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--white);
}

.page-contact .coop-card__text {
  margin: 0;
  flex: 1;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text);
}

.page-contact .coop-card__link {
  display: inline-block;
  margin-top: 20px;
  align-self: flex-start;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 208, 124, 0.45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-contact .coop-card__link:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

@media (hover: hover) {
  .page-contact .coop-card:hover {
    transform: translateY(-3px);
  }
  .page-contact .coop-card__link:hover {
    color: var(--white);
    border-color: var(--white);
  }
}

/* ---------- 站点信息 ---------- */
.page-contact .contact-site__title {
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  margin: 0 0 22px;
  color: var(--white);
}

.page-contact .site-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
}

.page-contact .site-facts__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px;
  background: var(--ink-950);
}

.page-contact .site-facts__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-contact .site-facts__val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-contact .contact-site__note {
  margin: 22px 0 0;
  max-width: 46em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text);
}

.page-contact .contact-site__note a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 208, 124, 0.45);
}

.page-contact .contact-site__note a:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-contact .site-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-contact .coop-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-contact .flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-contact .contact-prep__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-contact .contact-hero__aside {
    position: sticky;
    top: 118px;
  }
}

@media (min-width: 1100px) {
  .page-contact .contact-hero__title {
    font-size: clamp(3.2rem, 5.4vw, 4.6rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-line,
  .page-contact .checklist__label,
  .page-contact .checklist__mark,
  .page-contact .checklist__mark::after,
  .page-contact .coop-card,
  .page-contact .feedback-board__ready {
    transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
      border-color var(--dur) var(--ease), opacity var(--dur) var(--ease);
  }
  .page-contact .coop-card:hover,
  .page-contact .checklist__label:hover {
    transform: none;
  }
  .page-contact .feedback-board__ready {
    transform: none;
  }
}