.page-contact {
  --contact-body: #c6dbcf;
  --contact-card-bg: #0b2a21;
  --contact-strip-bg: rgba(11, 42, 33, 0.62);
}

.page-contact .section-head {
  margin-bottom: var(--space-3);
}

/* ============ Hero ============ */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(29, 74, 58, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 74, 58, 0.42) 1px, transparent 1px);
  background-size: 68px 68px;
  background-position: -1px -1px;
  opacity: 0.7;
  -webkit-mask-image: linear-gradient(155deg, rgba(0, 0, 0, 0.95), transparent 72%);
  mask-image: linear-gradient(155deg, rgba(0, 0, 0, 0.95), transparent 72%);
  pointer-events: none;
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -180px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(92, 255, 177, 0.12), transparent 66%);
  pointer-events: none;
}

.page-contact .contact-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-contact .contact-hero__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-contact .contact-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-sans);
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--frost);
}

.page-contact .contact-hero__intro {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--contact-body);
}

.page-contact .contact-hero__status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  padding: 10px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--contact-strip-bg);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-contact .contact-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .contact-index a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 10px 14px;
  background: var(--ink-900);
  color: var(--frost);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-contact .contact-index a:hover,
.page-contact .contact-index a:focus-visible {
  background: var(--ink-800);
  color: var(--mint);
}

.page-contact .contact-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
  letter-spacing: 0.08em;
}

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

.page-contact .contact-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

/* ============ 服务渠道 ============ */
.page-contact .channels {
  padding: var(--space-5) 0 var(--space-4);
}

.page-contact .channels__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-contact .channel-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--contact-card-bg);
}

.page-contact .channel-card--mail {
  border-left: 2px solid var(--mint);
}

.page-contact .channel-card--phone {
  border-left: 2px solid var(--amber);
}

.page-contact .channel-card .tag {
  align-self: flex-start;
}

.page-contact .channel-card__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 3.4vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--frost);
  word-break: break-all;
}

.page-contact .channel-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--contact-body);
}

.page-contact .channel-card__meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-contact .channel-strip {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: var(--contact-strip-bg);
}

.page-contact .channel-strip__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-contact .channel-strip__value {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--frost);
}

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

.page-contact .channels__privacy {
  margin: var(--space-2) 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .channels__privacy a,
.page-contact .topic-panel__foot a,
.page-contact .collab__item a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(92, 255, 177, 0.4);
}

.page-contact .channels__privacy a:hover,
.page-contact .topic-panel__foot a:hover,
.page-contact .collab__item a:hover {
  color: var(--focus);
  border-bottom-color: var(--focus);
}

/* ============ 咨询分类 ============ */
.page-contact .topics {
  padding: var(--space-4) 0 var(--space-5);
}

.page-contact .topic-switch {
  position: relative;
}

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

.page-contact .topic-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-contact .topic-tab {
  --topic-color: var(--mint);
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-900);
  color: var(--contact-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-contact .topic-tab:hover {
  border-color: var(--line);
  background: var(--ink-800);
  color: var(--frost);
}

.page-contact .topic-tab__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 22px;
  height: 22px;
  border: 1px solid var(--topic-color);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--topic-color);
}

.page-contact .topic-tab--mint { --topic-color: #5cffb1; }
.page-contact .topic-tab--amber { --topic-color: #ff9f43; }
.page-contact .topic-tab--clay { --topic-color: #c97755; }
.page-contact .topic-tab--sand { --topic-color: #d9c9a3; }

.page-contact #ctopic-member:checked ~ .topic-tabs [for="ctopic-member"],
.page-contact #ctopic-data:checked ~ .topic-tabs [for="ctopic-data"],
.page-contact #ctopic-coop:checked ~ .topic-tabs [for="ctopic-coop"],
.page-contact #ctopic-media:checked ~ .topic-tabs [for="ctopic-media"] {
  color: var(--topic-color);
  border-color: var(--topic-color);
  background: var(--ink-800);
}

.page-contact .topic-input:focus-visible ~ .topic-tabs {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
  border-radius: 8px;
}

.page-contact .topic-panels {
  margin-top: var(--space-2);
}

.page-contact .topic-panel {
  --topic-color: var(--mint);
  display: none;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--topic-color);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(11, 42, 33, 0.92), rgba(7, 28, 22, 0.92));
}

.page-contact .topic-panel--member { --topic-color: #5cffb1; }
.page-contact .topic-panel--data { --topic-color: #ff9f43; }
.page-contact .topic-panel--coop { --topic-color: #c97755; }
.page-contact .topic-panel--media { --topic-color: #d9c9a3; }

.page-contact #ctopic-member:checked ~ .topic-panels .topic-panel--member,
.page-contact #ctopic-data:checked ~ .topic-panels .topic-panel--data,
.page-contact #ctopic-coop:checked ~ .topic-panels .topic-panel--coop,
.page-contact #ctopic-media:checked ~ .topic-panels .topic-panel--media {
  display: block;
}

.page-contact .topic-panel__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

.page-contact .topic-panel__lead {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--contact-body);
}

.page-contact .topic-panel__sub {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-contact .prep-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .prep-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--contact-body);
}

.page-contact .prep-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 12px;
  height: 1px;
  background: var(--topic-color);
}

.page-contact .topic-panel__foot {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .topics__figure {
  margin: var(--space-4) 0 0;
}

.page-contact .topics__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

/* ============ 回复节奏 ============ */
.page-contact .timeline {
  padding: var(--space-4) 0 var(--space-5);
  border-top: 1px solid var(--line-soft);
}

.page-contact .timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-contact .dayline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-contact .dayline__item {
  position: relative;
  padding-left: 24px;
  border-left: 1px solid var(--line-soft);
}

.page-contact .dayline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--mint);
}

.page-contact .dayline__item--key::before {
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(92, 255, 177, 0.16);
}

.page-contact .dayline__time {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-contact .dayline__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--contact-body);
}

.page-contact .timeline__note {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-contact .timeline__note .tag {
  margin-bottom: 12px;
}

.page-contact .timeline__note h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

.page-contact .timeline__note p {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--contact-body);
}

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

/* ============ 合作与媒体 ============ */
.page-contact .collab {
  padding: var(--space-4) 0 var(--space-5);
  border-top: 1px solid var(--line-soft);
}

.page-contact .collab__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-contact .collab__item {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--contact-card-bg);
}

.page-contact .collab__item .tag {
  margin-bottom: 12px;
}

.page-contact .collab__item h3 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

.page-contact .collab__item p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--contact-body);
}

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

/* ============ 提交前检查 ============ */
.page-contact .checklist {
  padding: var(--space-4) 0 var(--space-5);
  border-top: 1px solid var(--line-soft);
}

.page-contact .checklist__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

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

.page-contact .check {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 48px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 42, 33, 0.6);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-contact .check:hover {
  border-color: var(--signal);
  background: var(--ink-800);
}

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

.page-contact .check__box {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--ink-950);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-contact .check input:checked + .check__box {
  background: var(--mint);
  border-color: var(--mint);
}

.page-contact .check input:checked + .check__box::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border: solid var(--ink-950);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.page-contact .check input:focus-visible + .check__box {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-contact .check__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--contact-body);
  transition: color 0.18s var(--ease);
}

.page-contact .check input:checked ~ .check__text {
  color: var(--frost);
}

.page-contact .checklist__side {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--clay);
  border-radius: var(--radius);
  background: var(--ink-800);
  align-self: start;
}

.page-contact .checklist__side h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--frost);
}

.page-contact .checklist__side p {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--contact-body);
}

.page-contact .checklist__side .btn {
  margin-top: 4px;
}

/* ============ 收尾 ============ */
.page-contact .closing {
  padding: 0 0 var(--space-5);
}

.page-contact .closing__inner {
  display: grid;
  gap: var(--space-2);
  padding: clamp(20px, 3.5vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(47, 191, 132, 0.12), transparent 62%),
    var(--ink-800);
}

.page-contact .closing__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--contact-body);
}

.page-contact .closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ============ 平板 ============ */
@media (min-width: 700px) {
  .page-contact .contact-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-contact .closing__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ============ 桌面 ============ */
@media (min-width: 960px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: var(--space-4);
  }

  .page-contact .contact-hero__visual img {
    aspect-ratio: 5 / 4;
  }

  .page-contact .channels__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-contact .channel-card--mail {
    grid-column: span 7;
  }

  .page-contact .channel-card--phone {
    grid-column: span 5;
  }

  .page-contact .channel-strip {
    grid-column: 1 / -1;
    grid-template-columns: 120px minmax(0, 1.2fr) minmax(0, 2fr);
    align-items: center;
    gap: 16px;
  }

  .page-contact .channel-strip__key {
    letter-spacing: 0.12em;
  }

  .page-contact .timeline__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
    gap: var(--space-3);
  }

  .page-contact .dayline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--space-2);
    padding-top: 18px;
  }

  .page-contact .dayline__item {
    padding-left: 0;
    padding-top: 16px;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .page-contact .dayline__item::before {
    left: 0;
    top: -5px;
  }

  .page-contact .checklist__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
    gap: var(--space-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .contact-index a,
  .page-contact .topic-tab,
  .page-contact .check,
  .page-contact .check__box,
  .page-contact .check__text {
    transition: none;
  }
}