.page-contact {
  --contact-gap: clamp(1rem, 2.4vw, 1.6rem);
  --contact-cut: 18px;
  padding-top: calc(var(--frame-h) + 1.25rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  background: var(--ink);
  color: var(--paper);
}

.page-contact .crumbs-row {
  padding-bottom: clamp(0.75rem, 2vw, 1.5rem);
}

.page-contact a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page-contact a.btn {
  text-decoration: none;
  color: inherit;
}

/* 首屏 */
.page-contact .contact-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
  align-items: center;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-contact h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.4vw, 3.7rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0.55rem 0 0;
  color: var(--paper);
}

.page-contact .lede {
  margin-top: clamp(0.85rem, 2vw, 1.2rem);
  max-width: 60ch;
  color: var(--muted);
  font-size: var(--step-1);
  line-height: 1.8;
}

.page-contact .contact-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: clamp(1rem, 2.4vw, 1.5rem);
}

.page-contact .contact-hero__hint {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: var(--step--1);
  line-height: 1.7;
  border-left: 2px solid var(--orange);
  padding-left: 0.7rem;
}

.page-contact .contact-hero__plate {
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

/* 章节标题行 */
.page-contact .panel-head {
  display: grid;
  gap: 0.5rem;
  margin-bottom: clamp(1.1rem, 2.6vw, 1.8rem);
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-contact .panel-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.2vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.005em;
  margin: 0;
  color: var(--paper);
}

.page-contact .panel-head__note {
  margin: 0;
  max-width: 65ch;
  color: var(--muted);
  font-size: var(--step--1);
  line-height: 1.75;
}

/* 通道卡 */
.page-contact .contact-channels {
  padding-block: clamp(1.6rem, 4vw, 2.8rem);
}

.page-contact .channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--contact-gap);
}

.page-contact .channel-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.55rem 1.25rem 1.35rem;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--contact-cut)), calc(100% - var(--contact-cut)) 100%, 0 100%);
}

.page-contact .channel-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--cyan);
}

.page-contact .channel-card--orange::before {
  background: var(--orange);
}

.page-contact .channel-card--soft::before {
  background: var(--cyan-soft);
}

.page-contact .channel-card__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin: 0;
}

.page-contact .channel-card--orange .channel-card__label {
  color: var(--orange-soft);
}

.page-contact .channel-card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-2);
  margin: 0;
  color: var(--paper);
}

.page-contact .channel-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.78;
  flex: 1;
}

.page-contact .channel-card__btn {
  margin-top: 0.5rem;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.02em;
  text-align: left;
  word-break: break-all;
  max-width: 100%;
}

/* 反馈类型 + 信息牌 */
.page-contact .contact-feedback {
  padding-block: clamp(1.8rem, 4.5vw, 3rem);
  border-top: 1px solid var(--line-soft);
}

.page-contact .feedback-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3.5vw, 2.6rem);
  align-items: start;
}

.page-contact .fb-list {
  margin-top: clamp(0.9rem, 2vw, 1.3rem);
}

.page-contact .fb-item {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--rule);
}

.page-contact .fb-item + .fb-item {
  margin-top: 0.55rem;
}

.page-contact .fb-item[open] {
  border-left-color: var(--cyan);
  background: var(--card);
}

.page-contact .fb-item summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  cursor: pointer;
  list-style: none;
}

.page-contact .fb-item summary::-webkit-details-marker {
  display: none;
}

.page-contact .fb-item summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan);
  margin-left: auto;
}

.page-contact .fb-item[open] summary::after {
  content: "－";
  color: var(--orange);
}

.page-contact .fb-item__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan);
}

.page-contact .fb-item__title {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-contact .fb-item__body {
  padding: 0 1rem 1.1rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.78;
}

.page-contact .fb-item__body p {
  margin: 0;
}

.page-contact .fb-item__list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.page-contact .fb-item__list li {
  position: relative;
  padding-left: 0.95rem;
  font-size: 0.88rem;
  color: var(--paper);
}

.page-contact .fb-item__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 7px;
  height: 1px;
  background: var(--orange);
}

.page-contact .locate {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.3rem 1.15rem 1.4rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--contact-cut)), calc(100% - var(--contact-cut)) 100%, 0 100%);
}

.page-contact .locate__title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 0.6rem;
}

.page-contact .locate__address {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-2);
  line-height: 1.32;
  margin: 0 0 0.75rem;
  color: var(--paper);
}

.page-contact .locate__copy {
  font-size: 0.82rem;
  padding: 0.45rem 0.9rem;
}

.page-contact .locate__list {
  margin: 1.3rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 0.7rem;
}

.page-contact .locate__row {
  display: grid;
  gap: 0.15rem;
}

.page-contact .locate__row dt {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-contact .locate__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--paper);
  word-break: break-all;
}

.page-contact .locate__note {
  margin: 1.15rem 0 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 流程 */
.page-contact .contact-flow {
  padding-block: clamp(1.8rem, 4.5vw, 3rem);
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-contact .flow-scale {
  display: none;
  width: 100%;
  height: 20px;
  color: var(--rule);
  margin-bottom: 1rem;
}

.page-contact .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--contact-gap);
}

.page-contact .flow-step {
  border-left: 1px solid var(--line);
  padding: 0.15rem 0 0.35rem 0.85rem;
}

.page-contact .flow-step__num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--cyan);
  display: block;
  line-height: 1;
}

.page-contact .flow-step h3 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  margin: 0.55rem 0 0.35rem;
  color: var(--paper);
}

.page-contact .flow-step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 合作 */
.page-contact .contact-coop {
  padding-block: clamp(2rem, 5vw, 3.5rem);
}

.page-contact .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3.5vw, 2.6rem);
  align-items: start;
}

.page-contact .coop-intro {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: var(--step-0);
  line-height: 1.8;
  max-width: 62ch;
}

.page-contact .coop-list {
  list-style: none;
  margin: clamp(1rem, 2.4vw, 1.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-contact .coop-item {
  background: var(--card);
  border: 1px solid var(--line-soft);
  padding: 0.95rem 1rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-contact .coop-item h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  color: var(--cyan-soft);
}

.page-contact .coop-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-contact .coop-cta-line {
  margin: 1.2rem 0 0.85rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-contact .coop-plate {
  border: 1px solid var(--line);
}

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

  .page-contact .flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-contact .contact-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-contact .flow-scale {
    display: block;
  }

  .page-contact .coop-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 1024px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .feedback-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
  }

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