.page-contact {
  --fb-line: rgba(207, 227, 240, .28);
  --fb-panel: rgba(11, 61, 92, .55);
  background: var(--paper);
  color: var(--plateau-ink);
}

/* ---------- 首屏 ---------- */
.page-contact .fb-hero {
  position: relative;
  padding: clamp(28px, 6vw, 72px) 0 clamp(36px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(124, 90, 209, .38), transparent 58%),
    linear-gradient(150deg, var(--lake-deep) 0%, #0d2c46 48%, var(--dusk-purple) 100%);
  color: var(--ice-white);
  overflow: hidden;
}
.page-contact .fb-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 88px;
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 34%, 100% 100%);
  pointer-events: none;
}
.page-contact .fb-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}
.page-contact .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: var(--fs-2xs);
  letter-spacing: .04em;
  color: rgba(245, 250, 255, .7);
}
.page-contact .crumbs a {
  color: var(--lake-glow);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 184, 224, .5);
}
.page-contact .crumbs a:hover,
.page-contact .crumbs a:focus-visible {
  color: var(--amber-signal);
  border-bottom-color: var(--amber-signal);
}
.page-contact .fb-hero .eyebrow {
  color: var(--amber-signal);
  letter-spacing: .16em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.page-contact .fb-hero .display--hero {
  color: var(--ice-white);
  letter-spacing: .04em;
  line-height: 1.02;
  margin-bottom: 20px;
  text-shadow: 4px 4px 0 rgba(10, 27, 38, .55);
}
.page-contact .fb-hero .lede {
  max-width: 60ch;
  color: rgba(245, 250, 255, .86);
  line-height: 1.85;
}
.page-contact .fb-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .fb-hero__board {
  align-self: start;
  border: var(--bw) solid var(--lake-glow);
  background: var(--fb-panel);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 3vw, 26px);
  backdrop-filter: blur(2px);
}
.page-contact .fb-board__title {
  margin: 0 0 14px;
  font-size: var(--fs-2xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber-signal);
}
.page-contact .fb-board__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--fb-line);
  border: 1px solid var(--fb-line);
}
.page-contact .fb-board__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(10, 27, 38, .55);
}
.page-contact .fb-board__k {
  font-size: var(--fs-xs);
  color: rgba(245, 250, 255, .78);
}
.page-contact .fb-board__v {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--frost-teal);
  letter-spacing: .04em;
  white-space: nowrap;
}
.page-contact .fb-board__note {
  margin: 16px 0 0;
  font-size: var(--fs-xs);
  line-height: 1.8;
  color: rgba(245, 250, 255, .72);
}

/* ---------- 通用节头 ---------- */
.page-contact .fb-prep__intro,
.page-contact .fb-cat__intro,
.page-contact .fb-sla__intro,
.page-contact .fb-ch__intro {
  max-width: 66ch;
  margin-top: 14px;
  color: var(--text-soft);
  line-height: 1.85;
}
.page-contact .fb-cat__intro {
  color: rgba(245, 250, 255, .8);
}

/* ---------- 01 提交要点 ---------- */
.page-contact .fb-prep {
  background: var(--paper);
}
.page-contact .fb-prep__head .display--2 {
  color: var(--plateau-ink);
}
.page-contact .fb-prep__list {
  list-style: none;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.5vw, 22px);
}
.page-contact .fb-prep__item {
  position: relative;
  border: var(--bw) solid var(--plateau-ink);
  border-left-width: 10px;
  background: var(--paper-dim);
  padding: clamp(18px, 3vw, 26px) clamp(18px, 3vw, 28px);
  box-shadow: 4px 4px 0 0 rgba(10, 27, 38, .16);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-color 180ms var(--ease);
}
.page-contact .fb-prep__item:nth-child(2) {
  margin-left: clamp(0px, 3vw, 40px);
  border-left-color: var(--lake-blue);
  background: #eef6fc;
}
.page-contact .fb-prep__item:nth-child(3) {
  border-left-color: var(--dusk-orchid);
}
.page-contact .fb-prep__item:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.page-contact .fb-prep__num {
  display: inline-block;
  font-size: var(--fs-2xs);
  letter-spacing: .16em;
  color: var(--paper);
  background: var(--lake-blue);
  padding: 4px 10px;
  margin-bottom: 12px;
}
.page-contact .fb-prep__title {
  margin: 0 0 10px;
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--plateau-ink);
}
.page-contact .fb-prep__item p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.85;
}

/* ---------- 02 分类实验室 ---------- */
.page-contact .fb-cat {
  background:
    linear-gradient(118deg, rgba(59, 42, 99, .92) 0%, rgba(10, 27, 38, .96) 62%),
    var(--plateau-ink);
  color: var(--ice-white);
}
.page-contact .fb-cat .display--2,
.page-contact .fb-cat .eyebrow {
  color: var(--ice-white);
}
.page-contact .fb-cat .eyebrow {
  color: var(--amber-signal);
}
.page-contact .fb-lab {
  display: grid;
  gap: clamp(20px, 3.4vw, 40px);
  grid-template-columns: 1fr;
  margin-top: clamp(26px, 4vw, 44px);
}
.page-contact .fb-lab__rail {
  display: grid;
  gap: 22px;
}
.page-contact .fb-catpicker {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-contact .fb-catbtn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 15px;
  font: inherit;
  font-size: var(--fs-xs);
  color: var(--ice-white);
  background: transparent;
  border: var(--bw) solid rgba(207, 227, 240, .45);
  cursor: pointer;
  transition: background 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease);
}
.page-contact .fb-catbtn__num {
  font-size: var(--fs-2xs);
  color: var(--amber-signal);
  letter-spacing: .1em;
}
.page-contact .fb-catbtn:hover {
  border-color: var(--lake-glow);
  background: rgba(18, 118, 168, .28);
}
.page-contact .fb-catbtn:focus-visible {
  outline: 3px solid var(--lake-glow);
  outline-offset: 2px;
}
.page-contact .fb-catbtn.is-active {
  background: var(--lake-blue);
  border-color: var(--amber-signal);
  box-shadow: 4px 4px 0 0 rgba(255, 181, 61, .38);
}
.page-contact .fb-catbtn.is-active .fb-catbtn__num {
  color: var(--ice-white);
}

.page-contact .fb-track {
  position: relative;
  border: var(--bw) solid rgba(207, 227, 240, .3);
  background: rgba(10, 27, 38, .55);
  padding: 20px 18px 18px;
}
.page-contact .fb-track__line {
  position: absolute;
  top: 34px;
  bottom: 84px;
  left: 30px;
  color: var(--lake-glow);
  opacity: .7;
}
.page-contact .fb-track__line svg {
  height: 100%;
  width: 8px;
}
.page-contact .fb-track__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.page-contact .fb-track__step {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1;
  opacity: .45;
  transition: opacity 200ms var(--ease);
}
.page-contact .fb-track__step.is-on {
  opacity: 1;
}
.page-contact .fb-track__step .status-dot {
  flex: none;
}
.page-contact .fb-track__step.is-on .status-dot {
  background: var(--amber-signal);
}
.page-contact .fb-track__label {
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: rgba(245, 250, 255, .9);
}
.page-contact .fb-track__eta {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(207, 227, 240, .35);
  font-size: var(--fs-2xs);
  line-height: 1.9;
  letter-spacing: .06em;
  color: rgba(245, 250, 255, .66);
}
.page-contact .fb-track__eta .mono {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--amber-signal);
  letter-spacing: .04em;
}

.page-contact .fb-pane {
  border: var(--bw) solid rgba(207, 227, 240, .3);
  background: rgba(18, 118, 168, .12);
  padding: clamp(20px, 3vw, 30px);
}
.page-contact .fb-pane[hidden] {
  display: none;
}
.page-contact .fb-pane__title {
  margin: 0 0 12px;
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ice-white);
}
.page-contact .fb-pane__lead {
  margin: 0 0 20px;
  color: rgba(245, 250, 255, .82);
  line-height: 1.85;
}
.page-contact .fb-pane__label {
  margin: 0 0 10px;
  font-size: var(--fs-2xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--frost-teal);
}
.page-contact .fb-pane__need {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(207, 227, 240, .24);
  border: 1px solid rgba(207, 227, 240, .24);
}
.page-contact .fb-pane__need li {
  position: relative;
  padding: 11px 14px 11px 34px;
  background: rgba(10, 27, 38, .72);
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: rgba(245, 250, 255, .88);
}
.page-contact .fb-pane__need li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 20px;
  width: 8px;
  height: 8px;
  background: var(--lake-glow);
}
.page-contact .fb-pane__eta {
  margin: 0;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--amber-signal);
}

/* ---------- 03 编号与状态 ---------- */
.page-contact .fb-track-sec {
  background: var(--paper);
}
.page-contact .fb-track-sec__grid {
  margin-top: clamp(26px, 4vw, 44px);
}
.page-contact .fb-track-sec__media .media {
  border: var(--bw) solid var(--plateau-ink);
  box-shadow: var(--shadow-glow);
}
.page-contact .fb-track-sec__media .media-caption {
  margin-top: 12px;
  font-size: var(--fs-2xs);
  letter-spacing: .14em;
  color: var(--text-soft);
}
.page-contact .fb-track-sec__lead {
  margin: 0 0 24px;
  font-size: var(--fs-sm);
  line-height: 1.9;
  color: var(--text-soft);
}
.page-contact .fb-acc {
  border-top: var(--bw) solid var(--plateau-ink);
}
.page-contact .fb-acc .acc-item {
  border-bottom: var(--bw) solid var(--plateau-ink);
}
.page-contact .fb-acc .acc-trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 4px;
  font: inherit;
  text-align: left;
  background: transparent;
  border: 0;
  cursor: pointer;
  color: var(--plateau-ink);
}
.page-contact .fb-acc .acc-trigger:focus-visible {
  outline: 3px solid var(--lake-blue);
  outline-offset: 2px;
}
.page-contact .fb-acc__num {
  flex: none;
  width: 38px;
  font-size: var(--fs-2xs);
  letter-spacing: .1em;
  color: var(--paper);
  background: var(--lake-deep);
  text-align: center;
  padding: 5px 0;
}
.page-contact .fb-acc__name {
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: .04em;
}
.page-contact .fb-acc .acc-trigger[aria-expanded="true"] .fb-acc__num {
  background: var(--dusk-orchid);
}
.page-contact .fb-acc .acc-trigger[aria-expanded="true"] .fb-acc__name {
  color: var(--lake-blue);
}
.page-contact .fb-acc .acc-body {
  padding: 0 4px 18px 52px;
  color: var(--text-soft);
  line-height: 1.85;
}
.page-contact .fb-acc .acc-body p {
  margin: 0;
}
.page-contact .fb-track-sec__hint {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 8px solid var(--amber-signal);
  background: var(--paper-dim);
  font-size: var(--fs-xs);
  line-height: 1.8;
  color: var(--plateau-ink);
}

/* ---------- 04 时限 ---------- */
.page-contact .fb-sla {
  background: var(--paper-dim);
}
.page-contact .fb-sla__steps {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}
.page-contact .fb-sla__step {
  border: var(--bw) solid var(--lake-deep);
  background: var(--ice-white);
  padding: clamp(18px, 3vw, 24px);
  box-shadow: 5px 5px 0 0 rgba(11, 61, 92, .22);
}
.page-contact .fb-sla__tick {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--paper);
  background: var(--lake-blue);
  padding: 4px 12px;
  margin-bottom: 12px;
}
.page-contact .fb-sla__step:nth-child(3) .fb-sla__tick {
  background: var(--dusk-purple);
}
.page-contact .fb-sla__step:nth-child(4) .fb-sla__tick {
  background: var(--lake-deep);
}
.page-contact .fb-sla__stitle {
  margin: 0 0 8px;
  font-size: var(--fs-md);
  font-weight: 700;
  letter-spacing: .03em;
}
.page-contact .fb-sla__step p {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.85;
  color: var(--text-soft);
}
.page-contact .fb-sla__foot {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 16px 18px;
  border: var(--bw) dashed var(--lake-blue);
  background: rgba(47, 184, 224, .1);
  font-size: var(--fs-xs);
  line-height: 1.85;
  color: var(--plateau-ink);
}

/* ---------- 05 联系方式 ---------- */
.page-contact .fb-ch {
  background: var(--paper);
}
.page-contact .fb-ch__grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
  grid-template-columns: 1fr;
  margin-top: clamp(26px, 4vw, 42px);
}
.page-contact .fb-ch__card {
  border: var(--bw) solid var(--plateau-ink);
  background: var(--paper-dim);
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  gap: 10px;
  align-content: start;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}
.page-contact .fb-ch__card:nth-child(2) {
  background: #eef6fc;
  border-color: var(--lake-deep);
}
.page-contact .fb-ch__card:nth-child(3) {
  background: #f2eefc;
  border-color: var(--dusk-purple);
}
.page-contact .fb-ch__card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.page-contact .fb-ch__key {
  margin: 0;
  font-size: var(--fs-2xs);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lake-blue);
}
.page-contact .fb-ch__val {
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--plateau-ink);
  text-decoration: none;
  word-break: break-word;
  border-bottom: 2px solid var(--amber-signal);
  justify-self: start;
  padding-bottom: 3px;
}
.page-contact .fb-ch__val:hover,
.page-contact .fb-ch__val:focus-visible {
  color: var(--lake-blue);
  border-bottom-color: var(--lake-blue);
}
.page-contact .fb-ch__val--addr {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-contact .fb-ch__use {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.85;
  color: var(--text-soft);
}
.page-contact .fb-ch__note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: var(--fs-xs);
  line-height: 1.85;
  color: var(--text-soft);
}
.page-contact .fb-ch__note a {
  color: var(--lake-blue);
  border-bottom: 1px solid var(--lake-glow);
  text-decoration: none;
}
.page-contact .fb-ch__note a:hover,
.page-contact .fb-ch__note a:focus-visible {
  color: var(--dusk-orchid);
  border-bottom-color: var(--dusk-orchid);
}

/* ---------- 06 后续 ---------- */
.page-contact .fb-next {
  background:
    linear-gradient(200deg, var(--dusk-purple) 0%, var(--lake-deep) 62%, var(--plateau-ink) 100%);
  color: var(--ice-white);
}
.page-contact .fb-next__wrap {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}
.page-contact .fb-next .eyebrow {
  color: var(--amber-signal);
}
.page-contact .fb-next .display--2 {
  color: var(--ice-white);
  margin-bottom: 18px;
}
.page-contact .fb-next__body p {
  margin: 0 0 16px;
  color: rgba(245, 250, 255, .84);
  line-height: 1.9;
}
.page-contact .fb-next__body p:last-child {
  margin-bottom: 0;
}
.page-contact .fb-next__body a {
  color: var(--lake-glow);
  border-bottom: 1px solid rgba(47, 184, 224, .55);
  text-decoration: none;
}
.page-contact .fb-next__body a:hover,
.page-contact .fb-next__body a:focus-visible {
  color: var(--amber-signal);
  border-bottom-color: var(--amber-signal);
}
.page-contact .fb-next__stats {
  display: grid;
  gap: 1px;
  background: rgba(207, 227, 240, .26);
  border: var(--bw) solid rgba(207, 227, 240, .34);
  align-self: start;
}
.page-contact .fb-next__stat {
  background: rgba(10, 27, 38, .68);
  padding: 18px 20px;
  display: grid;
  gap: 6px;
}
.page-contact .fb-stat__num {
  font-size: var(--fs-2xl);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--frost-teal);
  line-height: 1;
}
.page-contact .fb-stat__label {
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: rgba(245, 250, 255, .74);
}

/* ---------- 页脚装饰带 ---------- */
.page-contact .fb-footband {
  position: relative;
  padding: clamp(30px, 5vw, 56px) 0 clamp(34px, 6vw, 64px);
  background: var(--plateau-ink);
  border-top: 8px solid var(--amber-signal);
  color: var(--ice-white);
  overflow: hidden;
}
.page-contact .fb-footband::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 12px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--amber-signal) 0 2px,
    transparent 2px 26px
  );
  opacity: .55;
}
.page-contact .fb-footband__inner {
  display: grid;
  gap: clamp(20px, 3.4vw, 38px);
  grid-template-columns: 1fr;
  align-items: center;
}
.page-contact .fb-footband__media {
  border: var(--bw) solid var(--lake-glow);
  box-shadow: 6px 6px 0 0 rgba(47, 184, 224, .28);
}
.page-contact .fb-footband__text .eyebrow {
  color: var(--amber-signal);
  letter-spacing: .18em;
  text-transform: uppercase;
}
.page-contact .fb-footband__line {
  margin: 12px 0 22px;
  max-width: 54ch;
  color: rgba(245, 250, 255, .86);
  line-height: 1.9;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .fb-ch__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .fb-sla__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .fb-prep__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .fb-prep__item:nth-child(1) {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-contact .fb-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, .85fr);
    align-items: start;
  }
  .page-contact .fb-lab {
    grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
    align-items: start;
  }
  .page-contact .fb-lab__rail {
    position: sticky;
    top: calc(var(--topbar-h) + 20px);
  }
  .page-contact .fb-catpicker {
    flex-direction: column;
    flex-wrap: nowrap;
  }
  .page-contact .fb-catbtn {
    width: 100%;
    justify-content: flex-start;
  }
  .page-contact .fb-track-sec__grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.1fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }
  .page-contact .fb-track-sec__media .media {
    margin-left: 0;
  }
  .page-contact .fb-sla__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-contact .fb-sla__step:nth-child(even) {
    transform: translateY(18px);
  }
  .page-contact .fb-ch__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .fb-next__wrap {
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, .8fr);
    gap: clamp(30px, 4vw, 56px);
  }
  .page-contact .fb-footband__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .page-contact .fb-ch__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .fb-prep__item,
  .page-contact .fb-catbtn,
  .page-contact .fb-ch__card,
  .page-contact .fb-track__step {
    transition: none;
  }
  .page-contact .fb-sla__step:nth-child(even) {
    transform: none;
  }
}