.page-contact {
  background: var(--ink-void);
  color: var(--white-hi);
  font-family: var(--font-body);
}

/* ---------- 首屏：错位双栏 ---------- */
.page-contact .co-hero {
  padding: 40px 0 56px;
}

.page-contact .co-hero-grid {
  display: grid;
  gap: 36px;
}

.page-contact .co-hero-copy > .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-signal);
  margin: 0 0 18px;
}

.page-contact .co-hero h1 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 7.2vw, 82px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--white-hi);
  margin: 0 0 20px;
  max-width: 12ch;
}

.page-contact .co-hero .lede {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--grey-index);
  max-width: 56ch;
  margin: 0 0 30px;
}

.page-contact .co-hero-keys {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-steel);
}

.page-contact .co-hero-keys li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-steel);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--grey-index);
}

.page-contact .co-hero-keys .index-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--blue-volt);
}

.page-contact .co-hero-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-steel);
  border-radius: 4px;
  clip-path: polygon(0 7%, 100% 0, 100% 100%, 0 93%);
}

.page-contact .co-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-contact .co-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(47, 107, 255, 0.38), rgba(36, 224, 214, 0.1) 55%, rgba(255, 79, 216, 0.24));
  mix-blend-mode: screen;
}

/* ---------- 主体：左展签 + 右卡片流 ---------- */
.page-contact .co-body {
  padding: 8px 0 72px;
}

.page-contact .co-layout {
  display: grid;
  gap: 40px;
}

.page-contact .co-plate {
  position: relative;
  border: 1px solid var(--line-steel);
  border-radius: var(--r-card);
  background: linear-gradient(180deg, rgba(47, 107, 255, 0.12), rgba(47, 107, 255, 0) 45%), var(--ink-slate);
  box-shadow: 0 30px 70px -52px rgba(47, 107, 255, 0.9);
  padding: 26px 22px 22px;
  overflow: hidden;
}

.page-contact .co-plate::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue-volt), var(--cyan-signal) 55%, var(--magenta-neon));
}

.page-contact .co-plate .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey-index);
  margin: 0 0 12px;
}

.page-contact .co-plate-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white-hi);
  margin: 0;
}

.page-contact .co-channel-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-contact .co-channel {
  padding: 16px 0;
  border-top: 1px solid var(--line-steel);
}

.page-contact .co-channel .plate-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey-index);
  margin: 0 0 7px;
}

.page-contact .co-channel-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--white-hi);
  margin: 0 0 5px;
  overflow-wrap: anywhere;
}

.page-contact .co-channel-value--addr {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.7;
}

.page-contact .co-channel-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--grey-index);
  margin: 0;
}

.page-contact .co-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 5px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--white-hi);
}

.page-contact .co-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-signal);
  box-shadow: 0 0 0 4px rgba(36, 224, 214, 0.16);
}

.page-contact .co-stream {
  display: grid;
  gap: 26px;
  align-content: start;
}

.page-contact .co-stream .section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--white-hi);
  margin: 0 0 12px;
}

.page-contact .co-stream .lede {
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey-index);
  max-width: 60ch;
  margin: 0;
}

.page-contact .co-card {
  border: 1px solid var(--line-steel);
  border-radius: var(--r-card);
  background: var(--ink-slate);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-contact .co-card:hover {
  transform: translateY(-4px);
  border-color: var(--blue-volt);
}

.page-contact .co-card:focus-within,
.page-contact .co-card[open] {
  border-color: var(--blue-volt);
}

.page-contact .co-card-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

.page-contact .co-card-head::-webkit-details-marker {
  display: none;
}

.page-contact .co-card-head:focus-visible {
  outline: 2px solid var(--cyan-signal);
  outline-offset: 2px;
  border-radius: var(--r-card);
}

.page-contact .co-card-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-signal);
}

.page-contact .co-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white-hi);
  margin: 0;
}

.page-contact .co-card-hint {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--grey-index);
  transition: color 0.2s var(--ease);
}

.page-contact .co-card-hint::before {
  content: "＋";
}

.page-contact .co-card[open] .co-card-hint {
  color: var(--blue-volt);
}

.page-contact .co-card[open] .co-card-hint::before {
  content: "－";
}

.page-contact .co-card-body {
  margin: 0 22px 22px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-steel);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--grey-index);
}

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

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

.page-contact .co-card-body strong {
  color: var(--white-hi);
  font-weight: 700;
}

.page-contact .co-card-body a {
  color: var(--cyan-signal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .co-card-body a:focus-visible {
  outline: 2px solid var(--cyan-signal);
  outline-offset: 2px;
  border-radius: 2px;
}

.page-contact .co-icons {
  margin: 4px 0 0;
  border: 1px solid var(--line-steel);
  border-radius: var(--r-card);
  background: var(--ink-slate);
  overflow: hidden;
}

.page-contact .co-icons img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 洽谈准备 ---------- */
.page-contact .co-prep {
  position: relative;
  padding: 64px 0 72px;
  border-top: 1px solid var(--line-steel);
  background: linear-gradient(180deg, rgba(47, 107, 255, 0.1), rgba(5, 7, 12, 0) 46%), var(--ink-void);
}

.page-contact .co-prep::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(47, 107, 255, 0), var(--blue-volt) 22%, var(--cyan-signal) 62%, rgba(36, 224, 214, 0));
}

.page-contact .co-prep .section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--white-hi);
  margin: 0 0 12px;
}

.page-contact .co-prep .lede {
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey-index);
  max-width: 62ch;
  margin: 0;
}

.page-contact .co-prep .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-signal);
  margin: 0 0 14px;
}

.page-contact .co-prep-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .co-prep-list li {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--line-steel);
  border-radius: var(--r-card);
  background: var(--ink-slate);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-contact .co-prep-list li:hover {
  transform: translateY(-4px);
  border-color: var(--blue-volt);
}

.page-contact .co-prep-list li::after {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 18px;
  height: 1px;
  background: linear-gradient(90deg, var(--blue-volt), var(--cyan-signal));
  opacity: 0.6;
}

.page-contact .co-prep-list .index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--blue-volt);
}

.page-contact .co-prep-list h3 {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--white-hi);
  margin: 10px 0 8px;
}

.page-contact .co-prep-list p {
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--grey-index);
  margin: 0;
}

/* ---------- 注册与反馈动线 ---------- */
.page-contact .co-flow {
  padding: 64px 0 88px;
  border-top: 1px solid var(--line-steel);
}

.page-contact .co-flow .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-signal);
  margin: 0 0 14px;
}

.page-contact .co-flow .section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--white-hi);
  margin: 0 0 12px;
}

.page-contact .co-flow .lede {
  font-size: 15px;
  line-height: 1.8;
  color: var(--grey-index);
  max-width: 62ch;
  margin: 0;
}

.page-contact .co-steps {
  display: grid;
  gap: 22px;
  margin-top: 40px;
}

.page-contact .co-steps::before {
  content: "";
  display: block;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue-volt), var(--cyan-signal) 55%, var(--magenta-neon));
  opacity: 0.6;
}

.page-contact .co-step {
  border: 1px solid var(--line-steel);
  border-radius: var(--r-card);
  background: var(--ink-slate);
  transition: border-color 0.25s var(--ease);
}

.page-contact .co-step:hover,
.page-contact .co-step:focus-within {
  border-color: var(--cyan-signal);
}

.page-contact .co-step-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

.page-contact .co-step-head::-webkit-details-marker {
  display: none;
}

.page-contact .co-step-head:focus-visible {
  outline: 2px solid var(--cyan-signal);
  outline-offset: 2px;
  border-radius: var(--r-card);
}

.page-contact .co-step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--blue-volt);
}

.page-contact .co-step-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--white-hi);
  margin: 0;
}

.page-contact .co-step-hint {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--grey-index);
}

.page-contact .co-step-hint::before {
  content: "＋";
}

.page-contact .co-step[open] .co-step-hint {
  color: var(--blue-volt);
}

.page-contact .co-step[open] .co-step-hint::before {
  content: "－";
}

.page-contact .co-step-body {
  margin: 0 20px 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-steel);
  font-size: 14px;
  line-height: 1.85;
  color: var(--grey-index);
}

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

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

.page-contact .co-step-body a,
.page-contact .co-flow-more a {
  color: var(--cyan-signal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .co-step-body a:focus-visible,
.page-contact .co-flow-more a:focus-visible {
  outline: 2px solid var(--cyan-signal);
  outline-offset: 2px;
  border-radius: 2px;
}

.page-contact .co-flow-more {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--grey-index);
}

.page-contact .co-visit {
  display: grid;
  gap: 8px;
  margin-top: 30px;
  padding: 20px 22px;
  border: 1px solid var(--line-steel);
  border-left: 3px solid var(--blue-volt);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  background: var(--ink-slate);
}

.page-contact .co-visit .plate-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-signal);
  margin: 0;
}

.page-contact .co-visit p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--grey-index);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-contact .co-hero {
    padding: 56px 0 72px;
  }
  .page-contact .co-hero-keys li {
    font-size: 14px;
  }
  .page-contact .co-prep-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .co-plate {
    padding: 30px 28px 26px;
  }
}

@media (min-width: 900px) {
  .page-contact .co-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }
  .page-contact .co-hero-media {
    aspect-ratio: 4 / 3;
  }
  .page-contact .co-stream details:nth-of-type(1) {
    margin-left: 0;
  }
  .page-contact .co-stream details:nth-of-type(2) {
    margin-left: 44px;
  }
  .page-contact .co-stream details:nth-of-type(3) {
    margin-left: 18px;
  }
  .page-contact .co-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }
  .page-contact .co-steps::before {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .page-contact .co-body {
    padding-bottom: 96px;
  }
  .page-contact .co-layout {
    grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }
  .page-contact .co-aside {
    position: sticky;
    top: 108px;
  }
  .page-contact .co-card-head {
    padding: 22px 26px;
  }
  .page-contact .co-card-body {
    margin: 0 26px 24px;
  }
  .page-contact .co-prep-list {
    grid-template-columns: 1.3fr 1fr 1fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .co-card,
  .page-contact .co-prep-list li {
    transition: none;
  }
  .page-contact .co-card:hover,
  .page-contact .co-prep-list li:hover {
    transform: none;
  }
}
</main>