.page-contact {
  --ct-lime: var(--c-green);
  --ct-heat: var(--c-orange);
  --ct-cool: var(--c-cyan);
  position: relative;
  isolation: isolate;
  overflow-x: hidden;
  padding-bottom: 72px;
}

.page-contact::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 920px;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(125% 60% at 70% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(125% 60% at 70% 0%, #000 0%, transparent 74%);
  pointer-events: none;
  z-index: 0;
}

.page-contact::after {
  content: "";
  position: absolute;
  top: -160px;
  right: -190px;
  width: min(620px, 88vw);
  height: min(620px, 88vw);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(182, 255, 60, 0.15), rgba(182, 255, 60, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-contact > * {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */
.page-contact .ct-crumbs {
  padding-top: 24px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-contact .ct-hero {
  padding-top: 20px;
}

.page-contact .ct-hero__grid {
  display: grid;
  gap: 28px;
}

.page-contact .ct-hero__title {
  margin: 10px 0 18px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.08;
}

.page-contact .ct-hero__lead .lede {
  max-width: 56ch;
}

/* 邮箱主卡 */
.page-contact .ct-mailbox {
  margin-top: 30px;
  padding: 22px 22px 24px;
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--ct-lime);
  border-radius: var(--r-m);
  background:
    linear-gradient(135deg, rgba(182, 255, 60, 0.1), rgba(77, 225, 242, 0.05) 58%, rgba(17, 26, 34, 0) 100%),
    var(--c-panel);
}

.page-contact .ct-mailbox__cap {
  margin: 0 0 12px;
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--c-mute);
}

.page-contact .ct-mailbox__addr {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.05rem, 4.6vw, 1.85rem);
  line-height: 1.22;
  color: var(--c-ink);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .ct-mailbox__hint {
  margin: 14px 0 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--c-mute);
  max-width: 52ch;
}

/* 右侧看板 */
.page-contact .ct-hero__aside {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-contact .ct-hero__shot {
  margin: 0;
}

.page-contact .ct-status {
  margin: 0;
  padding: 20px 22px 22px;
  border-radius: var(--r-l);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--ct-lime);
  background: linear-gradient(160deg, var(--c-raised), var(--c-panel));
}

.page-contact .ct-status__label {
  margin: 0;
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  color: var(--c-mute);
}

.page-contact .ct-status__value {
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.6rem, 6vw, 2.3rem);
  line-height: 1.1;
  color: var(--ct-lime);
}

.page-contact .ct-status__meta {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--c-mute);
}

/* ---------- 索引导航 ---------- */
.page-contact .ct-index {
  margin-top: 40px;
}

.page-contact .ct-index__list {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-contact .ct-index__list li {
  background: var(--c-base-soft);
}

.page-contact .ct-index__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  text-decoration: none;
  font-size: var(--step--1);
  color: var(--c-ink);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-contact .ct-index__list a:hover,
.page-contact .ct-index__list a:focus-visible {
  background: var(--c-raised);
  color: var(--ct-lime);
}

.page-contact .ct-index__num {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  color: var(--ct-cool);
}

/* ---------- 章节头 ---------- */
.page-contact .ct-head {
  max-width: 68ch;
  margin-bottom: 28px;
}

.page-contact .ct-head .h-section {
  margin: 8px 0 12px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

/* ---------- 标签页 ---------- */
.page-contact .ct-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
}

.page-contact .ct-tabs__btn {
  flex: 0 1 auto;
  padding: 10px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: var(--c-base-soft);
  color: var(--c-mute);
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-contact .ct-tabs__btn:hover,
.page-contact .ct-tabs__btn:focus-visible {
  color: var(--c-ink);
  border-color: var(--c-mute);
}

.page-contact .ct-tabs__btn[aria-selected="true"] {
  background: rgba(182, 255, 60, 0.12);
  border-color: var(--ct-lime);
  color: var(--ct-lime);
}

.page-contact .ct-tabs__panels {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-contact .ct-tabs__panel {
  padding: 24px 22px 26px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-l);
  background: var(--c-panel);
}

.page-contact .ct-tabs__ptitle {
  margin: 0 0 12px;
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--c-ink);
}

.page-contact .ct-tabs__panel p {
  margin: 0 0 12px;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--c-mute);
}

.page-contact .ct-tabs__panel p:last-child {
  margin-bottom: 0;
}

.page-contact .ct-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.page-contact .ct-list li {
  position: relative;
  padding: 6px 0 6px 22px;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--c-ink);
}

.page-contact .ct-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 15px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--ct-heat);
  transform: rotate(45deg);
}

/* ---------- 折叠指引 ---------- */
.page-contact .ct-guide__stack {
  display: grid;
  gap: 10px;
  border-left: 2px solid var(--c-line);
  padding-left: 16px;
}

.page-contact .ct-guide__item {
  border: 1px solid var(--c-line);
  border-radius: var(--r-m);
  background: var(--c-base-soft);
  overflow: hidden;
}

.page-contact .ct-guide__item[open] {
  background: var(--c-panel);
  border-color: rgba(182, 255, 60, 0.35);
}

.page-contact .ct-guide__item summary {
  position: relative;
  display: block;
  cursor: pointer;
  padding: 16px 18px 16px 48px;
  font-size: var(--step-0);
  font-weight: 800;
  color: var(--c-ink);
  list-style: none;
}

.page-contact .ct-guide__item summary::-webkit-details-marker {
  display: none;
}

.page-contact .ct-guide__item summary::before {
  content: "+";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--ct-lime);
}

.page-contact .ct-guide__item[open] summary::before {
  content: "–";
}

.page-contact .ct-guide__item summary:focus-visible {
  outline: 2px solid var(--ct-cool);
  outline-offset: -2px;
}

.page-contact .ct-guide__body {
  padding: 0 18px 18px 48px;
}

.page-contact .ct-guide__body p {
  margin: 0 0 10px;
  font-size: var(--step--1);
  line-height: 1.85;
  color: var(--c-mute);
}

.page-contact .ct-guide__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 合作通道 ---------- */
.page-contact .ct-partner__grid {
  display: grid;
  gap: 26px;
  align-items: center;
  padding: 28px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-l);
  background:
    linear-gradient(200deg, rgba(255, 122, 26, 0.09), rgba(10, 15, 20, 0) 62%),
    var(--c-base-soft);
}

.page-contact .ct-partner__body p {
  margin: 0 0 14px;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--c-mute);
}

.page-contact .ct-partner__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-contact .ct-partner__shot {
  margin: 0;
}

/* ---------- 电话与地址 ---------- */
.page-contact .ct-reach__grid {
  gap: 16px;
}

.page-contact .ct-reach__card {
  padding: 24px 22px 26px;
  border-radius: var(--r-l);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--ct-cool);
}

.page-contact .ct-reach__card--warm {
  border-left-color: var(--ct-heat);
}

.page-contact .ct-reach__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3.4vw, 1.35rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink);
  word-break: break-word;
}

.page-contact .ct-reach__card .panel__title {
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--c-ink);
}

.page-contact .ct-reach__card p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.85;
  color: var(--c-mute);
}

/* ---------- 底部备案 ---------- */
.page-contact .ct-base {
  margin-top: 48px;
}

.page-contact .ct-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
}

.page-contact .ct-base__icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ct-lime);
}

.page-contact .ct-base__note {
  margin: 0;
  font-size: var(--step--2);
}

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

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

@media (min-width: 900px) {
  .page-contact .ct-crumbs {
    padding-top: 30px;
  }

  .page-contact .ct-hero {
    padding-top: 26px;
  }

  .page-contact .ct-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 46px;
    align-items: start;
  }

  .page-contact .ct-index {
    margin-top: 52px;
  }

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

  .page-contact .ct-partner__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 38px;
    padding: 36px;
  }

  .page-contact .ct-guide__stack {
    padding-left: 24px;
  }
}

@media (min-width: 1100px) {
  .page-contact .ct-tabs__panels {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-contact .ct-tabs__panel {
    padding: 26px 22px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .ct-index__list a,
  .page-contact .ct-tabs__btn {
    transition: none;
  }
}