.page-contact {
  --fb-line: rgba(155, 167, 157, 0.22);
  --fb-line-strong: rgba(155, 167, 157, 0.42);
  --fb-panel: #171D18;
  --fb-panel-hi: #1F2620;
  --fb-accent: #C8FF3D;
  display: block;
  background: var(--c-void);
  color: var(--c-cold);
  overflow-x: hidden;
}

.page-contact img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 区块标题 ---------- */
.page-contact .fb-block-head {
  max-width: 62ch;
}

.page-contact .fb-block-head__title {
  margin: 0.5rem 0 0;
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.025em;
}

.page-contact .fb-block-head__note {
  margin: 0.85rem 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 首屏 ---------- */
.page-contact .fb-hero {
  position: relative;
  padding: clamp(2rem, 6vw, 4.25rem) 0 clamp(1.75rem, 4vw, 3rem);
  background:
    radial-gradient(115% 95% at 92% -10%, rgba(200, 255, 61, 0.15), transparent 58%),
    radial-gradient(70% 70% at 2% 110%, rgba(58, 212, 255, 0.1), transparent 62%),
    var(--c-void);
  overflow: hidden;
}

.page-contact .fb-hero::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -6%;
  width: min(360px, 48%);
  height: 120%;
  background: repeating-linear-gradient(-12deg, rgba(200, 255, 61, 0.09) 0 1px, transparent 1px 15px);
  transform: skewX(-12deg);
  transform-origin: top right;
  pointer-events: none;
}

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

.page-contact .fb-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: end;
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-contact .fb-hero__title {
  margin: 0.6rem 0 0;
  font-size: clamp(1.95rem, 6.6vw, 3.85rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.03em;
  max-width: 18ch;
}

.page-contact .fb-hero__lede {
  margin: 1.1rem 0 0;
  max-width: 62ch;
  font-size: clamp(0.96rem, 1.7vw, 1.08rem);
  line-height: 1.82;
  color: rgba(242, 246, 239, 0.82);
}

.page-contact .fb-hero__aside {
  display: grid;
  gap: 0.4rem;
  padding: 0.3rem 0 0.3rem 1.1rem;
  border-left: 2px solid var(--c-lime);
}

.page-contact .fb-hero__aside-label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--c-mist);
}

.page-contact .fb-hero__aside-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 9vw, 3.5rem);
  line-height: 0.95;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--c-lime);
}

.page-contact .fb-hero__aside-num span {
  margin-left: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.page-contact .fb-hero__aside-note {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-contact .fb-hero__figure {
  margin: clamp(1.75rem, 4vw, 3rem) 0 0;
  border: 1px solid var(--fb-line);
}

.page-contact .fb-hero__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 三条入口 ---------- */
.page-contact .fb-channels {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.page-contact .fb-channels__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-contact .fb-channel {
  --fb-accent: var(--c-lime);
  position: relative;
  padding: 1.5rem 1.3rem 1.6rem;
  background: linear-gradient(160deg, var(--fb-panel-hi), var(--fb-panel) 68%);
  border: 1px solid var(--fb-line);
  border-top: 3px solid var(--fb-accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .fb-channel:hover {
  border-color: var(--fb-accent);
  background: linear-gradient(160deg, #232B25, var(--fb-panel) 72%);
  transform: translateY(-2px);
}

.page-contact .fb-channel--lime { --fb-accent: var(--c-lime); }
.page-contact .fb-channel--blue { --fb-accent: var(--c-blue); }
.page-contact .fb-channel--orange { --fb-accent: var(--c-orange); }

.page-contact .fb-channel__index {
  margin: 0 0 0.6rem;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--fb-accent);
}

.page-contact .fb-channel__title {
  margin: 0 0 0.7rem;
  font-size: 1.05rem;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -0.01em;
  word-break: break-word;
}

.page-contact .fb-channel__body {
  margin: 0 0 1rem;
  font-size: 0.89rem;
  line-height: 1.8;
  color: rgba(242, 246, 239, 0.74);
}

.page-contact .fb-channel__list {
  margin: 0;
  padding: 0.9rem 0 0;
  list-style: none;
  display: grid;
  gap: 0.45rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--c-mist);
  border-top: 1px dashed var(--fb-line);
}

.page-contact .fb-channel__list li {
  position: relative;
  padding-left: 1rem;
}

.page-contact .fb-channel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--fb-accent);
  transform: skewX(-12deg);
}

/* ---------- 处理流程 ---------- */
.page-contact .fb-flow {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
  background: linear-gradient(180deg, rgba(23, 29, 24, 0) 0%, rgba(23, 29, 24, 0.88) 14%, rgba(23, 29, 24, 0.88) 86%, rgba(23, 29, 24, 0) 100%);
}

.page-contact .fb-flow__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-contact .fb-steps {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  border-top: 1px solid var(--fb-line);
}

.page-contact .fb-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--fb-line);
}

.page-contact .fb-step__marker {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-lime);
}

.page-contact .fb-step__title {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.page-contact .fb-step__body p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.82;
  color: rgba(242, 246, 239, 0.74);
}

.page-contact .fb-flow__figure {
  margin: 0;
  border: 1px solid var(--fb-line);
}

.page-contact .fb-flow__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 在线提交 ---------- */
.page-contact .fb-form-sec {
  padding: clamp(2.5rem, 6vw, 5.5rem) 0;
}

.page-contact .fb-form-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 3rem);
  align-items: start;
}

.page-contact .fb-form-sec__intro {
  margin: 1rem 0 0;
  max-width: 56ch;
  font-size: 0.92rem;
  line-height: 1.82;
  color: rgba(242, 246, 239, 0.76);
}

.page-contact .fb-form {
  margin-top: clamp(1.5rem, 3vw, 2rem);
  padding: clamp(1.25rem, 3vw, 2rem);
  display: grid;
  gap: 1.6rem;
  background: var(--fb-panel);
  border: 1px solid var(--fb-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-contact .fb-field {
  display: grid;
  gap: 0.6rem;
}

.page-contact .fb-field__label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

.page-contact .fb-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

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

.page-contact .fb-chip {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  font-size: 0.85rem;
  line-height: 1.2;
  color: var(--c-cold);
  background: transparent;
  border: 1px solid var(--fb-line-strong);
  border-radius: 2px;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-contact .fb-chip:hover {
  border-color: var(--c-lime);
  transform: translateY(-1px);
}

.page-contact .fb-chip-input:checked + .fb-chip {
  background: var(--c-lime);
  border-color: var(--c-lime);
  color: var(--c-void);
  font-weight: 700;
}

.page-contact .fb-chip-input:focus-visible + .fb-chip {
  outline: 2px solid var(--c-blue);
  outline-offset: 2px;
}

.page-contact .fb-input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.85rem 0.9rem;
  font: inherit;
  font-size: 0.94rem;
  color: var(--c-cold);
  background: #0E130F;
  border: 1px solid var(--fb-line-strong);
  border-bottom-width: 2px;
  border-radius: 2px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-contact .fb-input::placeholder {
  color: rgba(155, 167, 157, 0.7);
}

.page-contact .fb-input:hover {
  border-color: rgba(200, 255, 61, 0.45);
}

.page-contact .fb-input:focus {
  outline: none;
  background: #101610;
  border-color: var(--c-blue);
  box-shadow: 0 1px 0 0 var(--c-blue);
}

.page-contact .fb-input--area {
  resize: vertical;
  min-height: 128px;
  line-height: 1.72;
}

.page-contact .fb-input--mono {
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.page-contact .fb-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem 1.25rem;
  padding-top: 1.2rem;
  border-top: 1px dashed var(--fb-line);
}

.page-contact .fb-submit {
  padding: 0.85rem 2.1rem 0.85rem 1.6rem;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--c-void);
  background: var(--c-lime);
  border: 1px solid var(--c-lime);
  border-radius: 2px;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, calc(100% - 15px) 100%, 0 100%);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-contact .fb-submit:hover {
  background: #D9FF70;
  transform: translate(-1px, -1px);
}

.page-contact .fb-submit:active {
  transform: translate(0, 0);
}

.page-contact .fb-submit:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
}

.page-contact .fb-actions__note {
  margin: 0;
  flex: 1 1 15rem;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-contact .fb-form-sec__aside {
  display: grid;
  gap: 1rem;
}

.page-contact .fb-note-card {
  padding: 1.15rem 1.15rem 1.3rem;
  background: rgba(23, 29, 24, 0.62);
  border: 1px solid var(--fb-line);
  border-left: 3px solid var(--c-lime);
}

.page-contact .fb-note-card__title {
  margin: 0 0 0.7rem;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--c-lime);
}

.page-contact .fb-note-card p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.82;
  color: rgba(242, 246, 239, 0.76);
}

.page-contact .fb-note-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
  font-size: 0.86rem;
  line-height: 1.72;
  color: rgba(242, 246, 239, 0.76);
}

.page-contact .fb-note-card li {
  position: relative;
  padding-left: 1.1rem;
}

.page-contact .fb-note-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 7px;
  height: 7px;
  border: 1px solid var(--c-lime);
  transform: skewX(-12deg);
}

.page-contact .fb-note-card a {
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 212, 255, 0.35);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-contact .fb-note-card a:hover {
  border-bottom-color: var(--c-blue);
}

/* ---------- 选题与合作 ---------- */
.page-contact .fb-collab {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.page-contact .fb-collab__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-contact .fb-collab__card {
  position: relative;
  padding: 1.5rem 1.25rem 1.7rem;
  background: rgba(11, 15, 12, 0.5);
  border: 1px solid var(--fb-line);
}

.page-contact .fb-collab__card::after {
  content: "";
  position: absolute;
  left: 1.25rem;
  bottom: 0;
  width: 44px;
  height: 3px;
  background: var(--c-orange);
}

.page-contact .fb-collab__card h3 {
  margin: 0 0 0.7rem;
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-contact .fb-collab__card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.82;
  color: rgba(242, 246, 239, 0.74);
}

.page-contact .fb-collab__more {
  margin: 1.5rem 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-contact .fb-collab__more a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .fb-collab__more a:hover {
  border-bottom-color: var(--c-lime);
}

/* ---------- 位置与时段 ---------- */
.page-contact .fb-locate {
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.page-contact .fb-locate__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-contact .fb-locate__main p {
  margin: 1rem 0 0;
  max-width: 54ch;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(242, 246, 239, 0.78);
}

.page-contact .fb-locate__facts {
  margin: 0;
  display: grid;
  border-top: 1px solid var(--fb-line);
}

.page-contact .fb-locate__fact {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--fb-line);
}

.page-contact .fb-locate__fact dt {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}

.page-contact .fb-locate__fact dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--c-cold);
}

/* ---------- 尾部说明 ---------- */
.page-contact .fb-tail {
  padding: 0 0 clamp(2.5rem, 6vw, 4rem);
}

.page-contact .fb-tail p {
  margin: 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--fb-line);
  font-size: 0.82rem;
  line-height: 1.82;
  color: var(--c-mist);
}

.page-contact .fb-tail a {
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 212, 255, 0.35);
  transition: border-color var(--dur) var(--ease);
}

.page-contact .fb-tail a:hover {
  border-bottom-color: var(--c-blue);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-contact .fb-locate__fact {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
}

@media (min-width: 640px) {
  .page-contact .fb-step {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    gap: 0 1rem;
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-contact .fb-channels__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-contact .fb-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  }

  .page-contact .fb-hero__title {
    max-width: 22ch;
  }

  .page-contact .fb-locate__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-contact .fb-collab .fb-block-head {
    padding-left: clamp(1.5rem, 9vw, 7rem);
  }
}

@media (min-width: 920px) {
  .page-contact .fb-flow__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (min-width: 980px) {
  .page-contact .fb-form-sec__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .fb-channel,
  .page-contact .fb-chip,
  .page-contact .fb-input,
  .page-contact .fb-submit,
  .page-contact .fb-note-card a,
  .page-contact .fb-collab__more a,
  .page-contact .fb-tail a {
    transition: none;
  }

  .page-contact .fb-channel:hover,
  .page-contact .fb-chip:hover,
  .page-contact .fb-submit:hover {
    transform: none;
  }
}