/* ============================================================
   反馈与合作 /contact  页面专属样式
   作用域：.page-contact
   ============================================================ */

.page-contact {
  --ct-cut: 10px;
  --ct-dash-h: repeating-linear-gradient(90deg, var(--gold) 0 5px, transparent 5px 10px);
  --ct-dash-v: repeating-linear-gradient(180deg, var(--gold) 0 5px, transparent 5px 10px);
  padding: 18px var(--pad-x) 88px;
}

.page-contact > * {
  max-width: var(--shell);
  margin-inline: auto;
}

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

/* ---------- 面包屑 ---------- */
.page-contact .breadcrumb {
  margin-bottom: 24px;
}

.page-contact .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.page-contact .breadcrumb__item {
  color: var(--stone);
}

.page-contact .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--gold);
}

.page-contact .breadcrumb__item a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

.page-contact .breadcrumb__item a:hover,
.page-contact .breadcrumb__item a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: 22px 0 52px;
  border-bottom: 1px solid var(--paper-2);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: clamp(88px, 22%, 250px);
  height: 4px;
  background: var(--red);
  transform: skewX(-30deg);
  pointer-events: none;
}

.page-contact .contact-hero__kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-contact .contact-hero__title {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(36px, 8.5vw, 88px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-contact .contact-hero__lead {
  margin: 0;
  max-width: 38em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 章节 ---------- */
.page-contact .section {
  padding: 56px 0;
  border-bottom: 1px solid var(--paper-2);
}

.page-contact .section:last-of-type {
  border-bottom: 0;
  padding-bottom: 32px;
}

.page-contact .section__head {
  margin-bottom: 28px;
}

.page-contact .section__note a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  transition: color var(--t), border-color var(--t);
}

.page-contact .section__note a:hover,
.page-contact .section__note a:focus-visible {
  color: var(--red-deep);
  border-bottom-color: var(--red);
}

/* ---------- 通用按钮 ---------- */
.page-contact .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: background var(--t), color var(--t), border-color var(--t), transform var(--t);
}

.page-contact .btn--primary {
  color: var(--white);
  background: var(--red);
  border-color: var(--red);
}

.page-contact .btn--primary:hover,
.page-contact .btn--primary:focus-visible {
  background: var(--red-deep);
  border-color: var(--red-deep);
  transform: translateY(-2px);
}

/* ---------- 01 反馈表构建 ---------- */
.page-contact .build-figure {
  margin: 0 0 32px;
}

.page-contact .build-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-contact .build-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

.page-contact .build-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-contact .build-form,
.page-contact .build-aside,
.page-contact .coop-main,
.page-contact .issue-card,
.page-contact .channel-card,
.page-contact .flow__step {
  min-width: 0;
}

/* 表单卡 */
.page-contact .build-form {
  position: relative;
  display: grid;
  gap: 20px;
  padding: 30px 22px 28px;
  background: var(--white);
  clip-path: polygon(0 0, calc(100% - var(--ct-cut)) 0, 100% var(--ct-cut), 100% 100%, var(--ct-cut) 100%, 0 calc(100% - var(--ct-cut)));
}

.page-contact .build-form::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0%, var(--gold) 55%, transparent 100%);
  pointer-events: none;
}

.page-contact .build-form__hint {
  margin: 0;
  padding-bottom: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
  border-bottom: 1px dashed var(--paper-2);
}

/* 字段 */
.page-contact .field {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.page-contact .field__label {
  padding: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-contact .field__input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 11px 13px;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--paper);
  border: 1px solid var(--paper-2);
  border-radius: 0;
  transition: border-color var(--t), background-color var(--t), box-shadow var(--t);
}

.page-contact .field__input::placeholder {
  color: var(--stone);
  opacity: 0.72;
}

.page-contact .field__input:focus,
.page-contact .field__input:focus-visible {
  outline: none;
  border-color: var(--gold);
  background-color: var(--white);
  box-shadow: 0 0 0 2px rgba(217, 164, 65, 0.28);
}

.page-contact .field__input.mono {
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: 0.01em;
}

.page-contact textarea.field__input {
  min-height: 112px;
  resize: vertical;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.72;
}

.page-contact select.field__input {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 40px;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--stone) 50%),
    linear-gradient(135deg, var(--stone) 50%, transparent 50%);
  background-position: calc(100% - 19px) 50%, calc(100% - 14px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

/* 问题类型选项 */
.page-contact .chip-set {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-contact .chip {
  position: relative;
  display: inline-flex;
  cursor: pointer;
}

.page-contact .chip__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.page-contact .chip__text {
  display: block;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--stone);
  background: var(--paper);
  border: 1px solid var(--paper-2);
  transition: color var(--t), background var(--t), border-color var(--t);
}

.page-contact .chip:hover .chip__text {
  color: var(--ink);
  border-color: var(--gold);
}

.page-contact .chip__input:checked + .chip__text {
  color: var(--white);
  background: var(--red);
  border-color: var(--red);
}

.page-contact .chip__input:focus-visible + .chip__text {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* 右栏：预览与导出 */
.page-contact .build-aside {
  position: relative;
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-contact .preview-card {
  position: relative;
  padding: 22px 20px 22px;
  background: var(--white);
  clip-path: polygon(0 0, calc(100% - var(--ct-cut)) 0, 100% var(--ct-cut), 100% 100%, var(--ct-cut) 100%, 0 calc(100% - var(--ct-cut)));
}

.page-contact .preview-card__title {
  margin: 0 0 16px;
  padding-left: 12px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink);
  border-left: 4px solid var(--red);
}

.page-contact .preview-table {
  width: 100%;
  margin-bottom: 18px;
  border-collapse: collapse;
}

.page-contact .preview-table thead th {
  padding: 8px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-align: left;
  color: var(--ink);
  background: var(--gold-pale);
}

.page-contact .preview-table tbody th {
  width: 36%;
  padding: 10px;
  font-size: 12.5px;
  font-weight: 700;
  text-align: left;
  vertical-align: top;
  color: var(--stone);
  background: var(--paper);
  border-bottom: 1px solid var(--paper-2);
}

.page-contact .preview-table tbody td {
  padding: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  vertical-align: top;
  color: var(--stone);
  overflow-wrap: anywhere;
  border-bottom: 1px solid var(--paper-2);
}

.page-contact .preview-table tbody td.mono {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.01em;
}

.page-contact .export-btn {
  width: 100%;
}

.page-contact .export-note {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.72;
  color: var(--stone);
}

/* ---------- 02 问题类型与时效 ---------- */
.page-contact .issue-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .issue-card {
  position: relative;
  padding: 22px 18px 20px;
  background: var(--paper);
  border-top: 3px solid var(--red);
  transition: transform var(--t), background var(--t), border-color var(--t);
}

.page-contact .issue-card:hover {
  transform: translateY(-2px);
  background: var(--white);
  border-top-color: var(--gold);
}

.page-contact .issue-card__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-contact .issue-card__body {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--stone);
}

.page-contact .issue-card__time {
  margin: 0;
  padding-top: 12px;
  font-size: 12px;
  color: var(--jade);
  border-top: 1px dashed var(--paper-2);
}

.page-contact .issue-foot {
  margin: 22px 0 0;
  padding: 14px 16px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--gold-pale);
  border-left: 4px solid var(--gold);
}

.page-contact .issue-foot a {
  color: var(--red-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-contact .issue-foot a:hover,
.page-contact .issue-foot a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

/* ---------- 03 商务合作 ---------- */
.page-contact .coop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-contact .coop-main {
  display: grid;
  gap: 26px;
}

.page-contact .coop-block__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-contact .coop-block__title::before {
  content: "";
  flex: 0 0 auto;
  width: 18px;
  height: 3px;
  background: var(--red);
  transform: skewX(-30deg);
}

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

.page-contact .coop-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--stone);
}

.page-contact .coop-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.74em;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

.page-contact .coop-list--plain li::before {
  background: var(--jade);
}

.page-contact .coop-list strong {
  font-weight: 700;
  color: var(--ink);
}

.page-contact .coop-note {
  margin: 0;
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ink);
  background: var(--paper);
  border-left: 3px solid var(--jade);
}

.page-contact .coop-note a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-contact .coop-note a:hover,
.page-contact .coop-note a:focus-visible {
  color: var(--red-deep);
  border-bottom-color: var(--red);
}

.page-contact .coop-visual {
  margin: 0;
}

.page-contact .coop-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

/* ---------- 04 合作流程四步 ---------- */
.page-contact .flow {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .flow__step {
  position: relative;
  padding: 0 0 34px 44px;
}

.page-contact .flow__step:last-child {
  padding-bottom: 0;
}

.page-contact .flow__step::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 34px;
  bottom: 0;
  width: 2px;
  background: var(--ct-dash-v);
}

.page-contact .flow__step:last-child::before {
  display: none;
}

.page-contact .flow__dot {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--white);
  background: var(--red);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.page-contact .flow__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-contact .flow__body {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--stone);
}

.page-contact .flow__days {
  display: inline-block;
  padding: 3px 9px;
  font-size: 12px;
  color: var(--red-deep);
  background: var(--gold-pale);
}

/* ---------- 05 官方联系渠道 ---------- */
.page-contact .channel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .channel-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 20px;
  background: var(--white);
  border-top: 3px solid var(--red);
  clip-path: polygon(0 0, calc(100% - var(--ct-cut)) 0, 100% var(--ct-cut), 100% 100%, 0 100%);
}

.page-contact .channel-card__label {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-contact .channel-card__value {
  margin: 0;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.62;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-contact .channel-card__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--stone);
}

.page-contact .copy-btn {
  align-self: flex-start;
  margin-top: auto;
  padding: 8px 16px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--red);
  background: transparent;
  border: 1px solid var(--red);
  border-radius: 0;
  cursor: pointer;
  transition: color var(--t), background var(--t), border-color var(--t);
}

.page-contact .copy-btn:hover,
.page-contact .copy-btn:focus-visible {
  color: var(--white);
  background: var(--red);
}

.page-contact .record-line {
  margin: 26px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-contact .issue-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-contact {
    padding-top: 26px;
    padding-bottom: 104px;
  }

  .page-contact .build-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-contact .build-aside::before {
    content: "";
    position: absolute;
    top: 42px;
    left: -36px;
    width: 36px;
    height: 3px;
    background: var(--ct-dash-h);
    transform: rotate(-38deg);
    transform-origin: left center;
    pointer-events: none;
  }

  .page-contact .coop-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }

  .page-contact .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-contact .flow__step {
    padding: 46px 0 0 0;
  }

  .page-contact .flow__step:last-child {
    padding-bottom: 0;
  }

  .page-contact .flow__step::before {
    left: 32px;
    right: -24px;
    top: 15px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: var(--ct-dash-h);
  }

  .page-contact .flow__dot {
    top: 0;
    left: 0;
  }
}

@media (min-width: 1100px) {
  .page-contact .issue-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-contact .build-form {
    padding: 34px 30px 32px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .btn--primary:hover,
  .page-contact .issue-card:hover {
    transform: none;
  }
}