.page-contact {
  --contact-gap: clamp(44px, 6vw, 88px);
  --contact-soft: rgba(244, 248, 250, 0.78);
  --contact-mid: rgba(244, 248, 250, 0.22);
  --contact-body: #3a464f;
  background: var(--ice);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

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

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

/* ---------- 首屏 ---------- */

.page-contact .contact-hero {
  position: relative;
  background: var(--polar-900);
  color: var(--ice);
  padding-block: clamp(24px, 4vw, 44px) clamp(52px, 7vw, 96px);
}

.page-contact .contact-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--orange) 18%, transparent 62%);
}

.page-contact .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 44px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-contact .breadcrumb-list a {
  color: var(--cyan);
  text-decoration: none;
}

.page-contact .breadcrumb-list a:hover {
  color: var(--orange);
}

.page-contact .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--stone);
}

.page-contact .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-contact .hero-kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .contact-hero h1 {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ice);
  text-wrap: balance;
}

.page-contact .hero-lead {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 46ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--contact-soft);
}

.page-contact .hero-facts {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 36px);
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
  color: var(--contact-soft);
}

.page-contact .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--contact-mid);
}

.page-contact .hero-facts .mono {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-contact .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .hero-visual {
  margin: 0;
  align-self: end;
}

.page-contact .hero-visual .media-frame {
  padding: 10px;
  background: var(--polar-800);
  border: 1px solid rgba(79, 240, 192, 0.3);
  box-shadow: 10px -10px 0 rgba(255, 107, 44, 0.16);
}

.page-contact .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节索引 ---------- */

.page-contact .contact-index {
  background: var(--paper);
  border-bottom: 1px solid var(--ice-line);
  padding-block: 12px;
}

.page-contact .chapter-index {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-contact .chapter-index li {
  flex: 0 0 auto;
}

.page-contact .chapter-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid rgba(111, 119, 114, 0.34);
  background: transparent;
  color: var(--polar-900);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  scroll-snap-align: start;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-contact .chapter-link .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--clay);
}

.page-contact .chapter-link:hover,
.page-contact .chapter-link[data-active] {
  background: var(--polar-900);
  border-color: var(--polar-900);
  color: var(--ice);
}

.page-contact .chapter-link:hover .mono,
.page-contact .chapter-link[data-active] .mono {
  color: var(--cyan);
}

/* ---------- 通用章节 ---------- */

.page-contact .contact-section {
  padding-block: var(--contact-gap);
}

.page-contact .section-head {
  margin-bottom: clamp(24px, 3vw, 44px);
}

.page-contact .section-idx {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--clay);
}

.page-contact .section-head h2,
.page-contact .rhythm-copy h2,
.page-contact .partner-copy h2,
.page-contact .privacy-card h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--polar-900);
}

.page-contact .section-lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  color: var(--contact-body);
}

/* ---------- 01 反馈类型 ---------- */

.page-contact .contact-types {
  background: var(--ice);
}

.page-contact .type-grid {
  border-top: 1px solid var(--ice-line);
}

.page-contact .type-card {
  border-bottom: 1px solid var(--ice-line);
}

.page-contact .type-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
  transition: color 0.16s ease;
}

.page-contact .type-head::-webkit-details-marker {
  display: none;
}

.page-contact .type-head:hover .type-title {
  color: var(--clay);
}

.page-contact .type-idx {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-contact .type-title {
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 700;
  color: var(--polar-900);
  transition: color 0.16s ease;
}

.page-contact .type-caret {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-contact .type-caret::before {
  content: "+";
}

.page-contact .type-card[open] .type-caret::before {
  content: "\2013";
}

.page-contact .type-card[open] .type-idx {
  color: var(--orange);
}

.page-contact .type-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding: 0 2px clamp(22px, 3vw, 34px);
}

.page-contact .type-summary {
  margin: 0;
  font-size: 15.5px;
  color: var(--contact-body);
}

.page-contact .field-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-contact .field-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 12px;
  padding-left: 12px;
  border-left: 2px solid var(--ice-line);
  font-size: 15px;
  color: var(--ink);
}

.page-contact .field-name {
  flex: 0 0 auto;
  min-width: 84px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-contact .type-more {
  margin: 0;
  font-size: 14.5px;
  color: var(--stone);
}

.page-contact .type-more a {
  color: var(--polar-800);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
}

.page-contact .type-more a:hover {
  color: var(--orange);
}

/* ---------- 02 联系方式 ---------- */

.page-contact .contact-info {
  background: var(--paper);
}

.page-contact .contact-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .contact-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--ice);
  border: 1px solid var(--ice-line);
  border-top: 3px solid var(--moss);
  box-shadow: 5px 5px 0 rgba(16, 20, 24, 0.07);
}

.page-contact .contact-card--plain {
  border-top-color: var(--stone);
}

.page-contact .contact-mail {
  align-self: flex-start;
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: clamp(13.5px, 1.5vw, 16px);
  font-weight: 600;
  color: var(--polar-900);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 2px;
  overflow-wrap: anywhere;
  word-break: break-word;
  transition: color 0.16s ease;
}

.page-contact .contact-mail:hover {
  color: var(--clay);
}

.page-contact .contact-phone {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--polar-900);
  text-decoration: none;
  transition: color 0.16s ease;
}

.page-contact .contact-phone:hover {
  color: var(--orange);
}

.page-contact .contact-address {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  color: var(--polar-900);
}

.page-contact .card-note {
  margin: 0;
  font-size: 14px;
  color: var(--stone);
}

.page-contact .reply-line {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(111, 119, 114, 0.34);
  font-size: 15px;
  color: var(--contact-body);
}

.page-contact .reply-line .mono {
  display: inline-block;
  margin-right: 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

/* ---------- 03 写清问题 ---------- */

.page-contact .contact-brief {
  background: var(--ice);
}

.page-contact .brief-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-contact .brief-card {
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--paper);
  border: 1px solid rgba(111, 119, 114, 0.32);
}

.page-contact .brief-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-contact .brief-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 15.5px;
  color: var(--ink);
}

.page-contact .brief-num {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-contact .brief-text strong {
  color: var(--polar-900);
  border-bottom: 1px solid rgba(255, 107, 44, 0.55);
}

.page-contact .brief-note {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--polar-900);
  color: var(--ice);
}

.page-contact .brief-note .field-name {
  color: var(--cyan);
}

.page-contact .brief-sample {
  margin: 0;
  padding: 10px 12px;
  width: 100%;
  background: var(--polar-800);
  border-left: 3px solid var(--cyan);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ice);
  overflow-wrap: anywhere;
}

.page-contact .brief-note-text {
  margin: 0;
  font-size: 15px;
  color: var(--contact-soft);
}

/* ---------- 04 回复节奏 ---------- */

.page-contact .contact-rhythm {
  background: var(--polar-800);
  color: var(--ice);
}

.page-contact .rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
}

.page-contact .rhythm-copy .section-idx {
  color: var(--cyan);
}

.page-contact .rhythm-copy h2 {
  color: var(--ice);
}

.page-contact .rhythm-copy .section-lead {
  color: var(--contact-soft);
}

.page-contact .rhythm-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-contact .rhythm-list li {
  position: relative;
  padding: 15px 0 15px 22px;
  border-top: 1px solid var(--contact-mid);
  font-size: 15.5px;
  color: var(--contact-soft);
}

.page-contact .rhythm-list li:last-child {
  border-bottom: 1px solid var(--contact-mid);
}

.page-contact .rhythm-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

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

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

.page-contact .rhythm-visual .media-frame {
  padding: 8px;
  background: var(--polar-900);
  border: 1px solid rgba(79, 240, 192, 0.3);
}

/* ---------- 05 合作与媒体 ---------- */

.page-contact .contact-partner {
  background: var(--paper);
}

.page-contact .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 48px);
}

.page-contact .partner-copy p {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  color: var(--contact-body);
}

.page-contact .partner-copy a {
  color: var(--polar-900);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  overflow-wrap: anywhere;
}

.page-contact .partner-copy a:hover {
  color: var(--clay);
}

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

.page-contact .partner-points li {
  padding: 14px 16px;
  background: var(--ice);
  border-left: 3px solid var(--moss);
  font-size: 15px;
  color: var(--ink);
}

.page-contact .partner-points .mono {
  display: inline-block;
  margin-right: 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

/* ---------- 06 隐私提醒 ---------- */

.page-contact .contact-privacy {
  background: var(--ice);
  padding-bottom: clamp(40px, 5vw, 64px);
}

.page-contact .privacy-card {
  padding: clamp(22px, 3vw, 38px);
  background: var(--paper);
  border: 1px solid rgba(111, 119, 114, 0.34);
  border-left: 4px solid var(--clay);
}

.page-contact .privacy-card h2 {
  font-size: clamp(22px, 2.8vw, 32px);
}

.page-contact .privacy-card p {
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  color: var(--contact-body);
}

.page-contact .privacy-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 18px;
}

.page-contact .privacy-links a {
  font-size: 14px;
  color: var(--polar-900);
  text-decoration: none;
  border-bottom: 1px solid var(--stone);
  padding-bottom: 1px;
}

.page-contact .privacy-links a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 回到入口 ---------- */

.page-contact .contact-return {
  background: var(--polar-900);
  color: var(--ice);
  padding-block: clamp(42px, 6vw, 76px);
}

.page-contact .return-kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-contact .contact-return h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.14;
  color: var(--ice);
}

.page-contact .return-text {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 56ch;
  font-size: 15.5px;
  color: var(--contact-soft);
}

.page-contact .return-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-contact .return-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid rgba(207, 227, 238, 0.34);
  color: var(--ice);
  font-size: 15px;
  text-decoration: none;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease, color 0.18s ease;
}

.page-contact .return-link .route-arrow {
  font-family: var(--font-mono);
  color: var(--orange);
  transition: transform 0.18s ease;
}

.page-contact .return-link:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--polar-900);
  transform: translateY(-2px);
}

.page-contact .return-link:hover .route-arrow {
  color: var(--polar-900);
  transform: translateX(3px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-contact .contact-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-contact .type-body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-contact .brief-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-contact .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-contact .rhythm-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-contact .partner-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .return-link,
  .page-contact .return-link .route-arrow,
  .page-contact .chapter-link,
  .page-contact .contact-mail,
  .page-contact .contact-phone,
  .page-contact .type-title {
    transition: none;
  }

  .page-contact .return-link:hover {
    transform: none;
  }

  .page-contact .return-link:hover .route-arrow {
    transform: none;
  }
}