/* ===== 联系通道 / page-contact ===== */
.page-contact {
  --ct-panel: linear-gradient(165deg, rgba(18, 60, 70, .88), rgba(10, 42, 48, .95));
  --ct-line: rgba(31, 111, 120, .45);
  --ct-line-strong: rgba(31, 111, 120, .8);
  --ct-gap: clamp(20px, 3vw, 34px);
  background: var(--by-deep);
  color: var(--by-paper);
  overflow-x: hidden;
}

/* --- 首屏框景 --- */
.page-contact .ct-hero {
  position: relative;
  padding: clamp(18px, 3vw, 30px) 0 0;
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(53, 242, 214, .12), transparent 58%),
    radial-gradient(90% 80% at 100% 100%, rgba(255, 106, 43, .10), transparent 60%),
    var(--by-deep);
}

.page-contact .ct-crumbs {
  margin-bottom: clamp(16px, 2.4vw, 26px);
  font-size: 13px;
  color: var(--by-mist);
}
.page-contact .ct-crumbs a {
  color: var(--by-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--by-t) var(--by-ease), border-color var(--by-t) var(--by-ease);
}
.page-contact .ct-crumbs a:hover,
.page-contact .ct-crumbs a:focus-visible {
  color: var(--by-cyan);
  border-bottom-color: var(--by-cyan);
}
.page-contact .ct-crumbs [aria-current="page"] {
  color: var(--by-paper);
}
.page-contact .ct-crumbs__sep {
  margin: 0 8px;
  color: var(--by-wire-lite);
}

.page-contact .ct-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 46px);
  align-items: start;
}

.page-contact .ct-hero__copy { order: 1; }
.page-contact .ct-hero__media { order: 2; }

.page-contact .ct-hero__media {
  position: relative;
  margin: 0;
  padding: 0;
  border: 1px solid var(--ct-line-strong);
  aspect-ratio: 14 / 9;
  overflow: hidden;
  background: var(--by-deep-2);
}
.page-contact .ct-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06) brightness(.82);
}
.page-contact .ct-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(170deg, rgba(10, 42, 48, .18) 0%, rgba(53, 242, 214, .14) 100%);
  pointer-events: none;
}

.page-contact .ct-hero__copy .by-lead {
  margin-top: 18px;
  max-width: 46ch;
  color: var(--by-mist);
}

.page-contact .ct-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--ct-line);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-contact .ct-facts__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  font-size: 13px;
  color: var(--by-mist);
}
.page-contact .ct-facts__num {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--by-cyan);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.page-contact .ct-facts__cap {
  flex-basis: 100%;
  font-size: 12px;
  letter-spacing: .02em;
}

.page-contact .ct-hero__scale {
  height: 12px;
  margin-top: clamp(22px, 3vw, 36px);
  background-image: repeating-linear-gradient(90deg, var(--by-wire) 0 1px, transparent 1px 16px);
  border-bottom: 1px solid var(--ct-line);
  opacity: .75;
}

/* --- 通用小件 --- */
.page-contact .ct-num {
  margin: 0 0 10px;
  font-family: var(--by-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--by-wire-lite);
  font-variant-numeric: tabular-nums;
}
.page-contact .ct-num--bright {
  color: var(--by-cyan);
}
.page-contact .ct-head {
  margin-bottom: 20px;
}
.page-contact .ct-sub {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--by-mist);
  max-width: 44ch;
}

/* --- 主体双栏 --- */
.page-contact .ct-body {
  padding-top: clamp(36px, 5vw, 60px);
}
.page-contact .ct-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ct-gap);
  align-items: start;
}
.page-contact .ct-col-a,
.page-contact .ct-col-b {
  min-width: 0;
}

.page-contact .ct-block {
  margin-top: clamp(30px, 4vw, 46px);
}

/* --- 渠道卡片 --- */
.page-contact .ct-channels {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-contact .ct-channel {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--ct-line);
  background: var(--ct-panel);
  transition: transform var(--by-t) var(--by-ease), border-color var(--by-t) var(--by-ease);
}
.page-contact .ct-channel::after {
  content: "";
  position: absolute;
  top: 14px;
  right: 14px;
  width: 8px;
  height: 8px;
  background: var(--by-cyan);
  opacity: .45;
  transition: opacity var(--by-t) var(--by-ease), background var(--by-t) var(--by-ease);
}
.page-contact .ct-channel:hover,
.page-contact .ct-channel:focus-within {
  transform: translateY(-4px);
  border-color: var(--by-cyan);
}
.page-contact .ct-channel:hover::after {
  opacity: 1;
}
.page-contact .ct-channel__name {
  margin: 0;
  font-family: var(--by-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--by-wire-lite);
}
.page-contact .ct-channel__val {
  margin: 10px 0 10px;
  font-size: clamp(15px, 2.4vw, 18px);
  font-weight: 700;
  color: var(--by-paper);
  word-break: break-word;
  line-height: 1.4;
}
.page-contact .ct-channel__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--by-mist);
}

/* --- 勾选清单 --- */
.page-contact .ct-check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}
.page-contact .ct-check__label {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--ct-line);
  background: rgba(10, 42, 48, .62);
  cursor: pointer;
  transition: border-color var(--by-t) var(--by-ease), background var(--by-t) var(--by-ease);
}
.page-contact .ct-check__label:hover {
  border-color: var(--by-wire-lite);
}
.page-contact .ct-check__label:has(.ct-check__box:checked) {
  border-color: rgba(53, 242, 214, .5);
  background: rgba(53, 242, 214, .07);
}
.page-contact .ct-check__box {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  margin: 0;
  pointer-events: none;
}
.page-contact .ct-check__mark {
  flex: 0 0 auto;
  position: relative;
  width: 17px;
  height: 17px;
  margin-top: 3px;
  border: 1px solid var(--by-wire-lite);
  background: rgba(10, 42, 48, .9);
  transition: border-color var(--by-t) var(--by-ease), background var(--by-t) var(--by-ease);
}
.page-contact .ct-check__box:checked + .ct-check__mark {
  border-color: var(--by-cyan);
  background: rgba(53, 242, 214, .18);
}
.page-contact .ct-check__box:checked + .ct-check__mark::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 9px;
  border-right: 2px solid var(--by-cyan);
  border-bottom: 2px solid var(--by-cyan);
  transform: rotate(42deg);
}
.page-contact .ct-check__box:focus-visible + .ct-check__mark {
  box-shadow: 0 0 0 2px var(--by-cyan);
}
.page-contact .ct-check__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--by-mist);
  transition: color var(--by-t) var(--by-ease);
}
.page-contact .ct-check__text strong {
  color: var(--by-paper);
  font-weight: 700;
}
.page-contact .ct-check__box:checked ~ .ct-check__text {
  color: var(--by-paper);
}

/* --- 表单 --- */
.page-contact .ct-form {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--ct-line-strong);
  background: linear-gradient(180deg, rgba(10, 42, 48, .96), rgba(18, 60, 70, .74));
}
.page-contact .ct-form::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 72px;
  height: 3px;
  background: var(--by-cyan);
}
.page-contact .ct-form__title {
  margin: 0;
}
.page-contact .ct-form__intro {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--by-mist);
}

.page-contact .ct-form__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}
.page-contact .ct-field {
  min-width: 0;
}
.page-contact .ct-field__label {
  display: block;
  margin-bottom: 7px;
  font-family: var(--by-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--by-mist);
}
.page-contact .ct-req {
  color: var(--by-orange);
  font-weight: 700;
}
.page-contact .ct-input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  min-height: 46px;
  font-family: var(--by-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--by-paper);
  background: rgba(10, 42, 48, .92);
  border: 1px solid var(--ct-line);
  border-radius: var(--by-radius);
  transition: border-color var(--by-t) var(--by-ease), box-shadow var(--by-t) var(--by-ease);
}
.page-contact .ct-input::placeholder {
  color: rgba(159, 184, 188, .7);
}
.page-contact .ct-input:hover {
  border-color: var(--by-wire-lite);
}
.page-contact .ct-input:focus {
  outline: none;
  border-color: var(--by-cyan);
  box-shadow: 0 0 0 2px rgba(53, 242, 214, .38);
}
.page-contact .ct-input:not(:placeholder-shown):valid {
  border-color: rgba(216, 243, 92, .55);
}
.page-contact .ct-textarea {
  min-height: 112px;
  resize: vertical;
}

.page-contact .ct-form__foot {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.page-contact .ct-form__submit {
  transition: opacity var(--by-t) var(--by-ease), filter var(--by-t) var(--by-ease);
}
.page-contact .ct-form:has(input[required]:placeholder-shown) .ct-form__submit {
  opacity: .5;
  filter: saturate(.65);
}
.page-contact .ct-form__hint {
  margin: 0;
  flex: 1 1 200px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--by-mist);
}

/* --- 表单旁示意 --- */
.page-contact .ct-signal {
  margin: 20px 0 0;
  padding: 14px;
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  border: 1px solid var(--ct-line);
  background: rgba(10, 42, 48, .55);
}
.page-contact .ct-signal img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--ct-line);
}
.page-contact .ct-signal figcaption {
  font-size: 13px;
  line-height: 1.75;
  color: var(--by-mist);
}
.page-contact .ct-signal a,
.page-contact .ct-legend__more a {
  color: var(--by-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 214, .45);
  transition: border-color var(--by-t) var(--by-ease);
}
.page-contact .ct-signal a:hover,
.page-contact .ct-legend__more a:hover {
  border-bottom-color: var(--by-orange);
}

/* --- 合作类型 --- */
.page-contact .ct-coop-section {
  padding-top: clamp(36px, 5vw, 60px);
}
.page-contact .ct-coop {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-contact .ct-coop__card {
  padding: 20px;
  border: 1px solid var(--ct-line);
  background: var(--ct-panel);
  transition: transform var(--by-t) var(--by-ease), border-color var(--by-t) var(--by-ease);
}
.page-contact .ct-coop__card:hover {
  transform: translateY(-4px);
  border-color: var(--by-cyan);
}
.page-contact .ct-coop__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  font-family: var(--by-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--by-deep);
  background: var(--by-cyan);
}
.page-contact .ct-coop__tag--orange {
  background: var(--by-orange);
  color: var(--by-paper);
}
.page-contact .ct-coop__card .by-h3 {
  margin: 0 0 10px;
}
.page-contact .ct-coop__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--by-mist);
}
.page-contact .ct-coop__need {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--ct-line);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(216, 243, 92, .78);
}

/* --- 流程轨道 --- */
.page-contact .ct-flow-section {
  padding-top: clamp(36px, 5vw, 60px);
}
.page-contact .ct-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--ct-line);
  background: var(--ct-line);
}
.page-contact .ct-step {
  padding: 20px 18px;
  background: var(--by-deep);
  transition: background var(--by-t) var(--by-ease);
}
.page-contact .ct-step:hover {
  background: var(--by-deep-2);
}
.page-contact .ct-step__idx {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--by-lime);
  font-variant-numeric: tabular-nums;
}
.page-contact .ct-step .by-h3 {
  margin: 0 0 8px;
}
.page-contact .ct-step__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--by-mist);
}
.page-contact .ct-step__text a {
  color: var(--by-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 214, .45);
}

/* --- 字段说明 --- */
.page-contact .ct-legend-section {
  padding-top: clamp(36px, 5vw, 60px);
}
.page-contact .ct-legend {
  margin: 0;
  border-top: 1px solid var(--ct-line);
}
.page-contact .ct-legend__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 20px;
  padding: 15px 0;
  border-bottom: 1px solid var(--ct-line);
}
.page-contact .ct-legend__key {
  font-family: var(--by-mono);
  font-size: 13px;
  color: var(--by-paper);
}
.page-contact .ct-legend__val {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--by-mist);
}
.page-contact .ct-legend__flag {
  margin: 0;
}
.page-contact .ct-legend__more {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--by-mist);
}

/* --- 收尾信息 --- */
.page-contact .ct-final-section {
  padding-top: clamp(36px, 5vw, 60px);
  padding-bottom: 0;
}
.page-contact .ct-final {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(22px, 3.2vw, 34px);
  border: 1px solid var(--ct-line-strong);
  background:
    radial-gradient(90% 120% at 0% 0%, rgba(255, 106, 43, .14), transparent 62%),
    linear-gradient(140deg, rgba(18, 60, 70, .88), rgba(10, 42, 48, .96));
}
.page-contact .ct-final__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--by-mist);
  max-width: 42ch;
}
.page-contact .ct-final__list {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}
.page-contact .ct-final__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px dashed var(--ct-line);
}
.page-contact .ct-final__row:first-child {
  border-top: 1px dashed var(--ct-line);
}
.page-contact .ct-final__key {
  font-size: 13px;
  color: var(--by-wire-lite);
}
.page-contact .ct-final__val {
  margin: 0;
  font-size: 15px;
  color: var(--by-paper);
  word-break: break-word;
  font-variant-numeric: tabular-nums;
}

/* --- 底部刻度线 --- */
.page-contact .ct-footscale {
  position: relative;
  height: 20px;
  margin-top: clamp(40px, 5vw, 68px);
  background-image: repeating-linear-gradient(90deg, var(--by-wire) 0 1px, transparent 1px 10px);
  border-top: 1px solid var(--ct-line);
  opacity: .85;
}
.page-contact .ct-footscale::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--by-cyan), var(--by-orange) 68%, var(--by-lime));
}

/* --- 响应式 --- */
@media (min-width: 560px) {
  .page-contact .ct-form__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .page-contact .ct-field--full {
    grid-column: 1 / -1;
  }
  .page-contact .ct-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-contact .ct-check {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 720px) {
  .page-contact .ct-coop {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .ct-coop__card {
    padding: 24px;
  }
  .page-contact .ct-legend__row {
    grid-template-columns: 170px minmax(0, 1fr) 76px;
    align-items: baseline;
  }
  .page-contact .ct-legend__flag {
    justify-self: end;
    text-align: right;
  }
  .page-contact .ct-final {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .page-contact .ct-signal {
    grid-template-columns: 104px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-contact .ct-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
  }
  .page-contact .ct-hero__copy { order: 2; }
  .page-contact .ct-hero__media {
    order: 1;
    aspect-ratio: auto;
    min-height: 420px;
  }
  .page-contact .ct-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-contact .ct-cols {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(28px, 3.4vw, 52px);
  }
  .page-contact .ct-coop {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 400px) {
  .page-contact .ct-channel,
  .page-contact .ct-coop__card,
  .page-contact .ct-form,
  .page-contact .ct-final {
    padding-left: 16px;
    padding-right: 16px;
  }
  .page-contact .ct-final__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .ct-channel,
  .page-contact .ct-coop__card,
  .page-contact .ct-input,
  .page-contact .ct-form__submit {
    transition: none;
  }
  .page-contact .ct-channel:hover,
  .page-contact .ct-coop__card:hover {
    transform: none;
  }
}