.page-contact {
  --pc-cut: 18px;
  --pc-line: rgba(14, 21, 18, .2);
  background: var(--paper);
  color: var(--ink);
}

.page-contact .crumb {
  padding-top: 16px;
}

.page-contact .pc-block {
  padding: clamp(34px, 6vw, 62px) 0;
}

.page-contact .pc-block--errata {
  background:
    linear-gradient(180deg, rgba(18, 58, 50, .05) 0%, rgba(18, 58, 50, 0) 100%);
}

.page-contact .pc-block--tight {
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 64px);
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  position: relative;
  padding: clamp(24px, 4.5vw, 46px) 0 clamp(28px, 5vw, 50px);
  isolation: isolate;
}

.page-contact .contact-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 52%;
  height: 84%;
  background: linear-gradient(158deg, var(--green) 0%, var(--green-deep) 82%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
}

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

.page-contact .hero-copy h1 {
  margin: 0;
  font-size: clamp(28px, 6.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.5px;
  color: var(--ink);
}

.page-contact .hero-copy h1::before {
  content: "";
  display: block;
  width: 58px;
  height: 6px;
  margin-bottom: 16px;
  background: linear-gradient(90deg, var(--red) 0 62%, var(--gold) 62% 100%);
}

.page-contact .lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-contact .eyebrow {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--red);
  margin: 0 0 12px;
}

.page-contact .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

.page-contact .fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  padding: 8px 14px;
  background: var(--card);
  border: 2px solid var(--ink);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.page-contact .fact-num {
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 700;
  color: var(--red);
}

.page-contact .fact-label {
  font-size: 14px;
  color: var(--slate);
}

.page-contact .hero-scope {
  padding: 20px 20px 18px;
  background: var(--card);
  border: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - var(--pc-cut)) 0, 100% var(--pc-cut), 100% 100%, var(--pc-cut) 100%, 0 calc(100% - var(--pc-cut)));
}

.page-contact .scope-title {
  margin: 0 0 12px;
  font-size: 19px;
  letter-spacing: 0;
  color: var(--green);
}

.page-contact .scope-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-contact .scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-contact .scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  background: var(--red);
}

.page-contact .scope-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--pc-line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--red-deep);
}

/* ---------- 斜线分隔带 ---------- */
.page-contact .pc-slant {
  display: block;
  width: 100%;
  height: clamp(30px, 5vw, 54px);
  margin: clamp(10px, 2vw, 20px) 0 0;
}

.page-contact .pc-slant .slant-a { fill: var(--red); }
.page-contact .pc-slant .slant-b { fill: var(--green); }

/* ---------- 联系方式 ---------- */
.page-contact .contact-layout {
  display: grid;
  gap: 30px;
}

.page-contact .section-head {
  margin: 0;
}

.page-contact .section-head h2 {
  margin: 0;
  font-size: clamp(24px, 4.2vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.3px;
  color: var(--ink);
}

.page-contact .head-text {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

.page-contact .channels-top {
  display: grid;
  gap: 20px;
  margin-bottom: 24px;
}

.page-contact .pc-figure {
  margin: 0;
}

.page-contact .pc-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--ink);
  background: var(--card);
}

.page-contact .pc-figure--mail img {
  aspect-ratio: 4 / 3;
}

.page-contact .pc-figure--scene img {
  aspect-ratio: 3 / 2;
}

.page-contact .pc-caption {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-contact .channel-stack {
  display: grid;
  gap: 18px;
}

.page-contact .channel-card {
  position: relative;
  padding: 20px 20px 22px 26px;
  background: var(--card);
  border: 2px solid var(--ink);
  clip-path: polygon(0 0, calc(100% - var(--pc-cut)) 0, 100% var(--pc-cut), 100% 100%, var(--pc-cut) 100%, 0 calc(100% - var(--pc-cut)));
  transition: transform 200ms var(--ease), background-color 200ms var(--ease);
}

.page-contact .channel-card:hover {
  transform: translateY(-3px);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 7px;
}

.page-contact .channel-card--mail::before { background: var(--red); }
.page-contact .channel-card--tel::before { background: var(--gold); }
.page-contact .channel-card--addr::before { background: var(--green); }

.page-contact .channel-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
}

.page-contact .channel-kicker-text {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-contact .channel-name {
  margin: 0 0 8px;
  font-size: 20px;
  letter-spacing: 0;
  color: var(--ink);
}

.page-contact .channel-value {
  display: inline-block;
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(17px, 4.4vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  text-decoration: none;
  overflow-wrap: anywhere;
  word-break: break-word;
  border-bottom: 3px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-contact .channel-card--mail .channel-value { color: var(--red-deep); }
.page-contact .channel-card--tel .channel-value { color: var(--green); font-size: clamp(28px, 9vw, 56px); }
.page-contact .channel-card--addr .channel-value { color: var(--ink); }

.page-contact a.channel-value:hover {
  border-bottom-color: var(--gold);
}

.page-contact .channel-value--addr {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(17px, 3.4vw, 23px);
  line-height: 1.6;
  letter-spacing: 0;
}

.page-contact .channel-note {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-contact .address-row {
  display: grid;
  gap: 18px;
}

/* ---------- 侧栏 ---------- */
.page-contact .channels-side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-contact .side-panel {
  padding: 20px;
  background: var(--card);
  border: 2px solid var(--ink);
  clip-path: polygon(0 0, calc(100% - var(--pc-cut)) 0, 100% var(--pc-cut), 100% 100%, var(--pc-cut) 100%, 0 calc(100% - var(--pc-cut)));
}

.page-contact .side-title {
  margin: 0;
  font-size: 19px;
  letter-spacing: 0;
  color: var(--green);
}

.page-contact .side-text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-contact .self-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-contact .self-list li {
  padding-top: 12px;
  border-top: 1px dashed var(--pc-line);
}

.page-contact .self-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-contact .self-list a {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--cyan);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-contact .self-list a:hover {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-contact .self-list p {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate);
}

.page-contact .self-no {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--red);
}

.page-contact .side-panel--green {
  background: linear-gradient(145deg, var(--green) 0%, var(--green-deep) 100%);
  border-color: var(--green-deep);
}

.page-contact .side-panel--green .side-title { color: var(--gold-hi); }
.page-contact .side-panel--green .side-text { color: rgba(243, 231, 206, .88); }

.page-contact .side-btn {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 18px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  color: var(--green-deep);
  background: var(--gold-hi);
  border: 2px solid var(--gold-hi);
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: transform 180ms var(--ease), background-color 180ms var(--ease);
}

.page-contact .side-btn:hover {
  transform: translateY(-2px);
  background: var(--paper);
}

/* ---------- 勘误格式 ---------- */
.page-contact .errata-grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

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

.page-contact .field {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--pc-line);
}

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

.page-contact .field-no {
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--red);
}

.page-contact .field-body h3 {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: 0;
  color: var(--ink);
}

.page-contact .field-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-contact .errata-side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-contact .optional-box {
  padding: 18px 18px 16px;
  background: linear-gradient(150deg, rgba(18, 58, 50, .07) 0%, rgba(179, 39, 45, .09) 100%);
  border: 2px dashed var(--slate);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-contact .optional-box h3 {
  margin: 0 0 12px;
  font-size: 18px;
  letter-spacing: 0;
  color: var(--green);
}

.page-contact .optional-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .optional-list li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
}

.page-contact .opt-mark {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--red);
}

.page-contact .boundary {
  background: var(--card);
  border: 2px solid var(--green);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-contact .boundary > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  color: var(--green);
}

.page-contact .boundary > summary::-webkit-details-marker {
  display: none;
}

.page-contact .boundary > summary::after {
  content: "展开";
  flex: 0 0 auto;
  padding: 2px 8px;
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--red);
  border: 1px solid var(--red);
}

.page-contact .boundary[open] > summary::after {
  content: "收起";
}

.page-contact .boundary-body {
  padding: 0 18px 16px;
  border-top: 1px dashed var(--pc-line);
}

.page-contact .boundary-body p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 备案条 ---------- */
.page-contact .filing-bar {
  display: grid;
  gap: 18px;
  padding: 24px 22px;
  background: linear-gradient(140deg, var(--green) 0%, var(--green-deep) 100%);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-contact .filing-bar h2 {
  margin: 0;
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: 0;
  color: var(--paper);
}

.page-contact .filing-icp {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 12px 0 0;
}

.page-contact .filing-label {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold-hi);
}

.page-contact .filing-value {
  font-family: var(--font-num);
  font-size: clamp(16px, 2.6vw, 21px);
  font-weight: 700;
  color: var(--gold-hi);
  overflow-wrap: anywhere;
}

.page-contact .filing-side p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(243, 231, 206, .86);
}

.page-contact .filing-side p:last-child {
  margin-bottom: 0;
}

.page-contact .filing-side a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 焦点态 ---------- */
.page-contact a:focus-visible,
.page-contact summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ---------- 自适应 ---------- */
@media (max-width: 719px) {
  .page-contact .contact-hero::before {
    width: 68%;
    height: 44%;
    clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  }

  .page-contact .hero-scope {
    border-width: 2px;
  }
}

@media (min-width: 720px) {
  .page-contact .channels-top {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .8fr);
    gap: 26px;
    align-items: end;
  }

  .page-contact .address-row {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: stretch;
  }
}

@media (min-width: 900px) {
  .page-contact .hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .9fr);
    gap: clamp(28px, 4vw, 54px);
    align-items: end;
  }

  .page-contact .errata-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-contact .filing-bar {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 32px;
    align-items: center;
    padding: 30px;
  }
}

@media (min-width: 980px) {
  .page-contact .contact-layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 52px);
    align-items: start;
  }

  .page-contact .channels-side {
    position: sticky;
    top: 92px;
  }
}

@media (min-width: 1200px) {
  .page-contact .contact-hero::before {
    width: 48%;
  }
}