.page-contact {
  --pc-line: rgba(79, 209, 224, 0.18);
  --pc-line-strong: rgba(79, 209, 224, 0.36);
  --pc-panel: rgba(14, 58, 79, 0.42);
  --pc-alert: #ff9a7a;
  padding-top: var(--header-h);
  background: var(--night);
  color: var(--cool);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-contact .lead {
  max-width: 64ch;
  font-size: var(--step-16);
  line-height: 1.78;
  color: var(--cool);
  opacity: 0.86;
}

.page-contact .note-line {
  margin-top: 22px;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--cool-mid);
}

.page-contact .note-line a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--pc-line-strong);
}

/* 首屏 */
.contact-hero {
  position: relative;
  padding: 26px 0 0;
  background:
    radial-gradient(120% 92% at 84% -12%, rgba(21, 106, 138, 0.58), transparent 62%),
    radial-gradient(78% 62% at 4% 4%, rgba(79, 209, 224, 0.14), transparent 66%),
    var(--night);
  overflow: hidden;
}

.contact-hero::before {
  content: "";
  position: absolute;
  top: 12%;
  right: -18%;
  width: 340px;
  height: 340px;
  border: 1px solid var(--pc-line);
  border-radius: 50%;
  pointer-events: none;
}

.contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--pc-line-strong) 22%, var(--pc-line-strong) 76%, transparent);
  pointer-events: none;
}

.page-contact .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
  font-size: var(--step-12);
  letter-spacing: 0.06em;
  color: var(--cool-mid);
}

.page-contact .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(138, 155, 166, 0.6);
}

.page-contact .crumbs a {
  color: var(--cool-mid);
  text-decoration: none;
}

.page-contact .crumbs a:hover {
  color: var(--signal);
}

.page-contact .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-narrow);
  font-size: var(--step-12);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-contact h1.title-serif {
  margin: 0 0 18px;
  max-width: 20ch;
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 7vw, 4.1rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cool);
}

.page-contact .hero-keys {
  list-style: none;
  margin: 30px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--pc-line);
  display: grid;
  gap: 14px;
}

.page-contact .hero-keys__k {
  display: block;
  margin-bottom: 4px;
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  color: var(--cool-mid);
}

.page-contact .hero-keys__v {
  display: block;
  font-size: var(--step-16);
  color: var(--cool);
  word-break: break-all;
}

.page-contact .hero-scope {
  display: grid;
  gap: 1px;
  margin-top: 34px;
  padding-bottom: 38px;
}

.page-contact .scope-card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--pc-panel);
  border-left: 2px solid var(--ridge);
}

.page-contact .scope-card__no {
  margin: 0 0 10px;
  font-size: var(--step-12);
  letter-spacing: 0.2em;
  color: var(--cool-mid);
}

.page-contact .scope-card__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: var(--step-20);
  letter-spacing: 0.02em;
  color: var(--cool);
}

.page-contact .scope-card__desc {
  margin: 0 0 14px;
  font-size: var(--step-14);
  line-height: 1.75;
  color: rgba(230, 238, 243, 0.82);
}

.page-contact .scope-card__link {
  font-size: var(--step-12);
  letter-spacing: 0.1em;
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--pc-line-strong);
}

.page-contact .scope-card__link:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* 主体栅格与垂直轴 */
.page-contact .contact-layout {
  display: grid;
  gap: 8px;
  padding-top: 26px;
  padding-bottom: 56px;
}

.page-contact .contact-rail {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--pc-line);
}

.page-contact .contact-rail a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 0;
  white-space: nowrap;
  font-size: var(--step-12);
  letter-spacing: 0.1em;
  color: var(--cool-mid);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.page-contact .contact-rail a:hover {
  color: var(--cool);
}

.page-contact .contact-rail a[aria-current="true"] {
  color: var(--amber);
  border-color: var(--amber);
}

.page-contact .contact-rail__no {
  font-size: 11px;
  opacity: 0.8;
}

/* 章节 */
.page-contact .section {
  padding: 40px 0;
  border-bottom: 1px solid var(--pc-line);
}

.page-contact .section h2.title-serif {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 4.6vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--cool);
}

.page-contact .section .lead + * {
  margin-top: 26px;
}

/* 咨询范围 */
.page-contact .scope-rows {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--pc-line);
}

.page-contact .scope-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--pc-line);
}

.page-contact .scope-row__no {
  margin: 2px 0 0;
  font-size: var(--step-20);
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-contact .scope-row__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: var(--step-16);
  letter-spacing: 0.02em;
  color: var(--cool);
}

.page-contact .scope-row__body p {
  margin: 0 0 8px;
  font-size: var(--step-14);
  line-height: 1.78;
  color: rgba(230, 238, 243, 0.84);
}

.page-contact .scope-row__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: var(--step-12);
  color: var(--cool-mid);
}

.page-contact .tag {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--pc-line-strong);
  border-radius: var(--radius);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cool);
}

.page-contact .tag--lime {
  border-color: rgba(185, 242, 39, 0.5);
  color: var(--lime);
}

/* 图片 */
.page-contact .media {
  display: block;
  margin: 26px 0 0;
}

.page-contact .media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  object-fit: cover;
}

.page-contact .media__caption {
  margin-top: 10px;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--cool-mid);
}

/* 渠道与节奏 */
.page-contact .channel-cols {
  display: grid;
  gap: 24px;
  margin-top: 30px;
}

.page-contact .channel-block__title {
  margin: 0 0 14px;
  padding-bottom: 8px;
  font-family: var(--font-narrow);
  font-size: var(--step-16);
  letter-spacing: 0.08em;
  color: var(--cool);
  border-bottom: 1px solid var(--pc-line-strong);
}

.page-contact .channel-list {
  margin: 0;
}

.page-contact .channel-list dt {
  margin-top: 14px;
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  color: var(--lime);
}

.page-contact .channel-list dd {
  margin: 6px 0 0;
  font-size: var(--step-14);
  line-height: 1.78;
  color: rgba(230, 238, 243, 0.84);
  word-break: break-word;
}

.page-contact .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-contact .rhythm-list li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(79, 209, 224, 0.22);
  font-size: var(--step-14);
  line-height: 1.75;
  color: rgba(230, 238, 243, 0.86);
}

.page-contact .rhythm-list li:last-child {
  border-bottom: none;
}

.page-contact .rhythm-list__num {
  font-size: var(--step-16);
  color: var(--signal);
}

/* 切换控件 */
.page-contact .switcher {
  margin-top: 26px;
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  background: rgba(7, 26, 36, 0.5);
  overflow: hidden;
}

.page-contact .switcher__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--pc-line);
}

.page-contact .switcher__tab-wrap {
  flex: 1 1 120px;
  position: relative;
  background: var(--night);
}

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

.page-contact .switcher__tab {
  display: block;
  padding: 14px 16px;
  text-align: center;
  font-family: var(--font-narrow);
  font-size: var(--step-14);
  letter-spacing: 0.1em;
  color: var(--cool-mid);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.page-contact .switcher__tab:hover {
  color: var(--cool);
}

.page-contact .switcher__input:checked + .switcher__tab {
  background: var(--amber);
  color: var(--night);
  border-bottom-color: var(--amber);
}

.page-contact .switcher__input:focus-visible + .switcher__tab {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-contact .switcher__panels {
  padding: 20px 16px 22px;
}

.page-contact .panel {
  display: block;
}

.page-contact .switcher:has(#ct-data:checked) :is(#panel-cite, #panel-coop),
.page-contact .switcher:has(#ct-cite:checked) :is(#panel-data, #panel-coop),
.page-contact .switcher:has(#ct-coop:checked) :is(#panel-data, #panel-cite) {
  display: none;
}

.page-contact .panel__note {
  margin: 18px 0 0;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--cool-mid);
}

/* 材料勾选与刻度 */
.page-contact .mat-block {
  display: grid;
  gap: 20px;
}

.page-contact .check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-contact .check-list li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-contact .check-list input[type="checkbox"] {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin: 0;
  appearance: none;
  background: transparent;
  border: 1px solid var(--pc-line-strong);
  border-radius: var(--radius);
  cursor: pointer;
}

.page-contact .check-list input[type="checkbox"]:checked {
  background: var(--lime);
  border-color: var(--lime);
}

.page-contact .check-list input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--night);
  border-bottom: 2px solid var(--night);
  transform: rotate(45deg);
}

.page-contact .check-list input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-contact .check-list label {
  font-size: var(--step-14);
  line-height: 1.6;
  color: var(--cool);
  cursor: pointer;
}

.page-contact .check-list input[type="checkbox"]:checked + label {
  color: var(--lime);
}

.page-contact .pips {
  display: flex;
  gap: 6px;
}

.page-contact .pips > span {
  display: block;
  width: 34px;
  height: 6px;
  background: rgba(230, 238, 243, 0.14);
  border-radius: 1px;
  transition: background 200ms ease-out;
}

.page-contact .mat-block:has(#mat-1:checked) .pips > span:nth-child(1),
.page-contact .mat-block:has(#mat-2:checked) .pips > span:nth-child(2),
.page-contact .mat-block:has(#mat-3:checked) .pips > span:nth-child(3),
.page-contact .mat-block:has(#mat-4:checked) .pips > span:nth-child(4) {
  background: var(--lime);
}

.page-contact .pips-hint {
  margin: 10px 0 0;
  font-size: var(--step-12);
  line-height: 1.7;
  color: var(--cool-mid);
}

.page-contact .plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-contact .plain-list li {
  display: grid;
  grid-template-columns: minmax(96px, 128px) minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(79, 209, 224, 0.22);
  font-size: var(--step-14);
  line-height: 1.75;
  color: rgba(230, 238, 243, 0.86);
}

.page-contact .plain-list strong {
  font-family: var(--font-narrow);
  font-weight: 600;
  color: var(--cool);
}

/* 合作类型 */
.page-contact .coop-grid {
  display: grid;
  gap: 1px;
  margin-top: 24px;
  background: var(--pc-line);
  border: 1px solid var(--pc-line);
}

.page-contact .coop-item {
  padding: 20px 18px;
  background: var(--night);
}

.page-contact .coop-item__title {
  margin: 0 0 10px;
  font-family: var(--font-narrow);
  font-size: var(--step-16);
  letter-spacing: 0.04em;
  color: var(--signal);
}

.page-contact .coop-item p {
  margin: 0 0 10px;
  font-size: var(--step-14);
  line-height: 1.78;
  color: rgba(230, 238, 243, 0.84);
}

.page-contact .coop-item__meta {
  font-size: var(--step-12);
  letter-spacing: 0.12em;
  color: var(--amber);
}

/* 纸面区 */
.page-contact .paper-zone {
  background: var(--paper);
  color: var(--deep);
  border-radius: var(--radius-organic);
  padding: 26px 20px 30px;
  margin: 30px 0;
  border-bottom: none;
}

.page-contact .paper-zone h2.title-serif {
  color: var(--deep);
  margin-bottom: 18px;
}

.page-contact .paper-zone .eyebrow {
  color: var(--ridge);
}

.page-contact .paper-grid {
  display: grid;
  gap: 24px;
}

.page-contact .addr {
  font-style: normal;
}

.page-contact .addr p {
  margin: 0 0 12px;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--deep);
}

.page-contact .addr__k {
  display: block;
  margin-bottom: 4px;
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  color: var(--ridge);
}

.page-contact .paper-copy__note {
  margin: 0 0 12px;
  font-size: var(--step-14);
  line-height: 1.82;
  color: rgba(14, 58, 79, 0.86);
}

.page-contact .paper-zone .media {
  margin: 0;
}

.page-contact .paper-zone .media img {
  border-color: rgba(14, 58, 79, 0.22);
}

.page-contact .paper-zone .media__caption {
  color: rgba(14, 58, 79, 0.72);
}

/* 字段说明 */
.page-contact .field-area {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding: 22px 18px;
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  background: rgba(7, 26, 36, 0.52);
}

.page-contact .field label {
  display: block;
  margin-bottom: 8px;
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  color: var(--cool-mid);
}

.page-contact .field input,
.page-contact .field select,
.page-contact .field textarea {
  width: 100%;
  padding: 11px 12px;
  font-family: var(--font-sans);
  font-size: var(--step-14);
  line-height: 1.6;
  color: var(--cool);
  background: rgba(7, 26, 36, 0.72);
  border: 1px solid var(--pc-line-strong);
  border-radius: var(--radius);
}

.page-contact .field textarea {
  resize: vertical;
  min-height: 96px;
}

.page-contact .field input::placeholder,
.page-contact .field textarea::placeholder {
  color: rgba(138, 155, 166, 0.75);
}

.page-contact .field :is(input, select, textarea):focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 2px rgba(79, 209, 224, 0.22);
}

.page-contact .field__err {
  display: none;
  margin: 8px 0 0;
  font-size: var(--step-12);
  line-height: 1.6;
  color: var(--pc-alert);
}

.page-contact .field :is(input, textarea):user-invalid ~ .field__err {
  display: block;
}

.page-contact .field :is(input, textarea):not(:placeholder-shown):not(:focus):invalid ~ .field__err {
  display: block;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-contact .contact-hero {
    padding-top: 40px;
  }

  .page-contact .hero-keys {
    grid-template-columns: repeat(3, minmax(0, max-content));
    gap: 46px;
  }

  .page-contact .hero-scope {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
  }

  .page-contact .scope-card {
    padding: 24px 20px 26px;
  }

  .page-contact .field-area {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 24px;
    padding: 26px 24px;
  }

  .page-contact .field--wide {
    grid-column: 1 / -1;
  }

  .page-contact .coop-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .channel-cols {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
  }

  .page-contact .paper-zone {
    padding: 34px 32px 38px;
  }
}

@media (min-width: 980px) {
  .page-contact .contact-layout {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 42px;
    padding-top: 34px;
  }

  .page-contact .contact-rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: none;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    border-left: 1px solid var(--pc-line);
  }

  .page-contact .contact-rail a {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 6px;
    padding: 10px 0 10px 12px;
    white-space: normal;
    border-bottom: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-contact .contact-rail a[aria-current="true"] {
    border-left-color: var(--amber);
    border-bottom-color: transparent;
  }

  .page-contact .section {
    padding: 54px 0;
  }

  .page-contact .scope-row {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
    padding: 26px 0;
  }

  .page-contact .scope-row__no {
    font-size: 28px;
  }

  .page-contact .paper-grid {
    grid-template-columns: 8fr 4fr;
    gap: 34px;
    align-items: start;
  }

  .page-contact .switcher__panels {
    padding: 26px 24px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .pips > span {
    transition: none;
  }
}