.page-contact {
  --ct-paper: var(--c-paper);
  --ct-paper-ink: var(--c-ink-paper);
  --ct-gap: clamp(16px, 3vw, 28px);
  --ct-soft: rgba(15, 29, 40, 0.76);
  position: relative;
  padding-bottom: clamp(48px, 9vw, 104px);
}

.page-contact .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: clamp(16px, 3vw, 26px) 0 clamp(8px, 2vw, 14px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
}
.page-contact .breadcrumb a {
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-contact .breadcrumb a:hover {
  color: var(--c-green);
  border-bottom-color: var(--c-green);
}

/* ---------- hero ---------- */
.page-contact .ct-hero {
  padding: clamp(6px, 2vw, 14px) 0 clamp(30px, 6vw, 62px);
}
.page-contact .ct-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}
.page-contact .ct-hero__copy h1 {
  font-family: var(--font-display);
  font-size: clamp(29px, 6.2vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 14px 0 18px;
  color: var(--c-white);
  max-width: 15em;
}
.page-contact .ct-hero__lead {
  max-width: 36em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--fg-muted);
}
.page-contact .ct-hero__points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-contact .ct-hero__points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
}
.page-contact .ct-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--c-green);
}
.page-contact .ct-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-contact .ct-hero__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line-strong);
  background: var(--c-night);
  overflow: hidden;
}
.page-contact .ct-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 10, 18, 0) 45%, rgba(5, 10, 18, 0.82) 100%);
  pointer-events: none;
}
.page-contact .ct-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.7);
}
.page-contact .ct-hero__caption {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-green);
}

/* ---------- toc ---------- */
.page-contact .ct-toc {
  position: sticky;
  top: var(--hdr-h);
  z-index: 6;
  background: rgba(5, 10, 18, 0.9);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-contact .ct-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-contact .ct-toc__list::-webkit-scrollbar {
  display: none;
}
.page-contact .ct-toc__link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-contact .ct-toc__link:hover,
.page-contact .ct-toc__link.is-active {
  color: var(--c-green);
  border-color: var(--c-green);
}

/* ---------- sections ---------- */
.page-contact .ct-section {
  padding: clamp(34px, 6vw, 76px) 0;
  border-top: 1px solid var(--line);
}
.page-contact .ct-section:first-of-type {
  border-top: 0;
}
.page-contact .ct-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 4vw, 40px);
  max-width: 52em;
}
.page-contact .chapter-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-orange);
  letter-spacing: 0.04em;
}
.page-contact .ct-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.2;
  color: var(--c-white);
}
.page-contact .ct-section__intro {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--fg-muted);
  max-width: 38em;
}

/* ---------- channels ---------- */
.page-contact .ct-channels {
  display: grid;
  gap: clamp(22px, 4vw, 34px);
}
.page-contact .ct-channel-stack {
  display: grid;
  gap: var(--ct-gap);
}
.page-contact .ct-channel {
  position: relative;
  background: var(--ct-paper);
  color: var(--ct-paper-ink);
  border: 1px solid var(--c-paper-line);
  padding: clamp(18px, 3vw, 26px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.32);
}
.page-contact .ct-channel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--c-forest);
}
.page-contact .ct-channel:nth-child(2)::before {
  background: var(--c-orange);
}
.page-contact .ct-channel:nth-child(3)::before {
  background: var(--c-night);
}
.page-contact .ct-channel__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.page-contact .ct-channel__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-forest);
}
.page-contact .ct-channel__badge {
  padding: 3px 9px;
  border: 1px solid var(--c-orange);
  color: var(--c-orange);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.page-contact .ct-channel__badge--ghost {
  border-color: rgba(15, 29, 40, 0.35);
  color: var(--ct-soft);
}
.page-contact .ct-channel__value {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.6vw, 23px);
  font-weight: 700;
  line-height: 1.34;
  color: var(--ct-paper-ink);
  word-break: break-all;
  user-select: all;
}
.page-contact .ct-channel__value--address {
  word-break: normal;
}
.page-contact .ct-channel__for {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ct-soft);
}
.page-contact .ct-channel__meta {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(15, 29, 40, 0.22);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-forest);
}

.page-contact .ct-channels__aside {
  display: grid;
  gap: var(--ct-gap);
  align-content: start;
}
.page-contact .ct-aside-figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--c-night);
  overflow: hidden;
}
.page-contact .ct-aside-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.7);
}
.page-contact .ct-aside-figure figcaption {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-muted);
}
.page-contact .ct-aside-note {
  padding: 20px;
  background: rgba(20, 38, 61, 0.62);
  border: 1px solid var(--line);
}
.page-contact .ct-aside-note__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-contact .ct-aside-note__list li {
  padding-left: 14px;
  border-left: 2px solid var(--c-cool);
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-muted);
}
.page-contact .ct-aside-note__list strong {
  color: var(--c-white);
  font-weight: 600;
}

/* ---------- feedback ---------- */
.page-contact .ct-feedback {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}
.page-contact .ct-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.page-contact .ct-chip {
  padding: 6px 12px;
  border: 1px solid var(--c-orange);
  color: var(--c-orange);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.page-contact .ct-check {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}
.page-contact .ct-check li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.page-contact .ct-check li:first-child {
  padding-top: 0;
}
.page-contact .ct-check__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-green);
  padding-top: 3px;
}
.page-contact .ct-check h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-white);
}
.page-contact .ct-check p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fg-muted);
}
.page-contact .ct-feedback__aside {
  display: grid;
  gap: var(--ct-gap);
  align-content: start;
}
.page-contact .ct-tip {
  padding: 18px 20px;
  background: var(--c-paper);
  border: 1px solid var(--c-paper-line);
  border-left: 4px solid var(--c-orange);
}
.page-contact .ct-tip--green {
  border-left-color: var(--c-forest);
}
.page-contact .ct-tip__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-forest);
}
.page-contact .ct-tip__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ct-paper-ink);
}

/* ---------- collab ---------- */
.page-contact .ct-collab {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}
.page-contact .ct-collab__lead {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg-muted);
  max-width: 34em;
}
.page-contact .ct-collab__flow {
  display: grid;
  gap: 14px;
}
.page-contact .ct-collab__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}
.page-contact .ct-collab__step-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-orange);
}
.page-contact .ct-collab__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-white);
}
.page-contact .ct-acc {
  border: 1px solid var(--line-strong);
  background: rgba(20, 38, 61, 0.42);
  align-self: start;
}
.page-contact .ct-acc__item + .ct-acc__item {
  border-top: 1px solid var(--line);
}
.page-contact .ct-acc__item summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  line-height: 1.5;
  color: var(--c-white);
}
.page-contact .ct-acc__item summary::-webkit-details-marker {
  display: none;
}
.page-contact .ct-acc__item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--c-orange);
}
.page-contact .ct-acc__item[open] summary::after {
  content: "–";
}
.page-contact .ct-acc__item summary:hover {
  color: var(--c-green);
}
.page-contact .ct-acc__body {
  padding: 0 18px 18px;
}
.page-contact .ct-acc__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fg-muted);
}

/* ---------- pace ---------- */
.page-contact .ct-pace {
  display: grid;
  gap: 18px;
}
.page-contact .ct-pace__item {
  padding-top: 16px;
  border-top: 2px solid var(--c-orange);
}
.page-contact .ct-pace__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}
.page-contact .ct-pace__item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--c-white);
}
.page-contact .ct-pace__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--fg-muted);
}
.page-contact .ct-pace__note {
  margin-top: clamp(22px, 4vw, 34px);
  padding: 20px;
  border: 1px solid var(--line);
  background: rgba(20, 38, 61, 0.42);
}
.page-contact .ct-pace__note-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cool);
}
.page-contact .ct-pace__note p + p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fg-muted);
}

/* ---------- address ---------- */
.page-contact .ct-address {
  background: var(--ct-paper);
  color: var(--ct-paper-ink);
  border: 1px solid var(--c-paper-line);
  padding: clamp(20px, 4vw, 36px);
  display: grid;
  gap: 12px;
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.32);
}
.page-contact .ct-address__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-forest);
}
.page-contact .ct-address__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.6vw, 23px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ct-paper-ink);
  user-select: all;
}
.page-contact .ct-address__note {
  margin: 4px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(15, 29, 40, 0.24);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ct-soft);
  max-width: 40em;
}
.page-contact .ct-links {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 4vw, 34px);
}
.page-contact .ct-link {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line-strong);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}
.page-contact .ct-link:hover {
  border-color: var(--c-green);
  background: rgba(87, 240, 138, 0.06);
}
.page-contact .ct-link__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-white);
}
.page-contact .ct-link__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg-muted);
}

/* ---------- responsive ---------- */
@media (min-width: 760px) {
  .page-contact .ct-pace {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 30px);
  }
  .page-contact .ct-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-contact .ct-check li {
    grid-template-columns: 56px minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-contact .ct-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
  }
  .page-contact .ct-channels {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-contact .ct-feedback {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-contact .ct-collab {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: start;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-contact .ct-toc__link,
  .page-contact .ct-link {
    transition: none;
  }
}
</main>