.page-contact {
  --pc-line: rgba(23, 19, 15, .16);
  --pc-line-soft: rgba(23, 19, 15, .09);
  --pc-line-dark: rgba(251, 249, 244, .18);
  --pc-soft: rgba(251, 249, 244, .74);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-contact .shell {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- hero ---------- */

.page-contact .pc-hero {
  position: relative;
  padding: clamp(18px, 3vw, 34px) 0 clamp(34px, 6vw, 68px);
  border-bottom: 1px solid var(--pc-line-soft);
  background-image:
    linear-gradient(var(--pc-line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--pc-line-soft) 1px, transparent 1px),
    linear-gradient(180deg, var(--paper-2) 0%, rgba(244, 239, 228, 0) 76%);
  background-size: 44px 44px, 44px 44px, 100% 100%;
}

.page-contact .pc-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(18px, 3vw, 32px);
}

@media (min-width: 900px) {
  .page-contact .pc-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 4vw, 64px);
  }
}

.page-contact .pc-hero h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(32px, 7vw, 58px);
  line-height: 1.12;
  letter-spacing: -.012em;
  margin: 14px 0 0;
  max-width: 14em;
}

.page-contact .pc-hero__lede {
  font-family: var(--font-sans);
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.78;
  margin: 18px 0 0;
  max-width: 40em;
  color: var(--ink);
}

.page-contact .pc-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-contact .pc-hero__fig {
  margin: 0;
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .pc-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- section head ---------- */

.page-contact .pc-sec-head {
  max-width: 58em;
  margin-bottom: clamp(22px, 3.4vw, 42px);
}

.page-contact .pc-sec-head h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.2;
  margin: 8px 0 0;
}

.page-contact .pc-sec-sub {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 48em;
}

.page-contact .pc-sec-head--dark h2 {
  color: var(--mist);
}

.page-contact .pc-sec-head--dark .pc-sec-sub {
  color: var(--pc-soft);
}

/* ---------- bands ---------- */

.page-contact .pc-band {
  padding: clamp(42px, 6vw, 92px) 0;
}

.page-contact .pc-band--tint {
  background: var(--paper-2);
}

.page-contact .pc-band--dark {
  background: var(--midnight);
  color: var(--mist);
}

.page-contact .pc-band--dark .section-number {
  color: var(--cyan);
}

/* ---------- 02 channels ---------- */

.page-contact .contact-channels {
  display: grid;
  gap: 16px;
}

.page-contact .chan {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  background: rgba(251, 249, 244, .5);
}

.page-contact .chan--mail {
  border-color: rgba(11, 124, 116, .55);
  background: linear-gradient(158deg, rgba(18, 227, 209, .16) 0%, rgba(251, 249, 244, .72) 58%);
  overflow: hidden;
}

.page-contact .chan--mail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 4px;
  background: var(--cyan);
}

.page-contact .chan__tag {
  align-self: flex-start;
  margin: 0;
  padding: 3px 9px;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--cyan-deep);
}

.page-contact .chan--phone .chan__tag,
.page-contact .chan--addr .chan__tag {
  color: var(--slate);
}

.page-contact .chan__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.25;
  margin: 4px 0 0;
}

.page-contact .chan__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 4.2vw, 24px);
  line-height: 1.4;
  color: var(--ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-contact .chan--mail .chan__value {
  color: var(--cyan-deep);
  font-size: clamp(15px, 3.6vw, 21px);
}

.page-contact .chan--addr .chan__value {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
}

.page-contact .chan__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

.page-contact .chan__actions {
  margin-top: auto;
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-contact .copy-btn {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--midnight);
  background: var(--cyan);
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  padding: 9px 16px;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.page-contact .copy-btn:hover {
  background: transparent;
  color: var(--cyan-deep);
  border-color: var(--cyan-deep);
}

.page-contact .copy-btn:focus-visible {
  outline: 2px solid var(--magenta);
  outline-offset: 2px;
}

.page-contact .copy-btn.is-on {
  background: var(--midnight);
  border-color: var(--midnight);
  color: var(--cyan);
}

.page-contact .copy-status {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan-deep);
  min-height: 1em;
}

@media (min-width: 860px) {
  .page-contact .contact-channels {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
  }

  .page-contact .chan--mail {
    grid-column: 1 / span 7;
    grid-row: 1 / span 2;
  }

  .page-contact .chan--phone {
    grid-column: 8 / span 5;
    grid-row: 1;
  }

  .page-contact .chan--addr {
    grid-column: 8 / span 5;
    grid-row: 2;
  }
}

/* ---------- 03 why ---------- */

.page-contact .pc-why__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-contact .pc-why__intro h2,
.page-contact .pc-partner__intro h2,
.page-contact .pc-prep__intro h2 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 38px);
  line-height: 1.2;
  margin: 8px 0 0;
}

.page-contact .pc-why__text {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
  max-width: 42em;
}

.page-contact .pc-band--tint .pc-why__text {
  color: var(--ink);
}

.page-contact .pc-why__reasons {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-contact .pc-why__reasons li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-top: 14px;
  border-top: 1px solid var(--pc-line);
}

.page-contact .pc-why__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--rust);
  padding-top: 3px;
}

.page-contact .pc-why__reasons p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

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

.page-contact .pc-why__col {
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  background: rgba(251, 249, 244, .66);
}

.page-contact .pc-why__h {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 23px);
  line-height: 1.3;
  margin: 0;
}

.page-contact .pc-why__col .pc-why__text {
  margin-top: 10px;
  font-size: 15px;
  color: var(--slate);
}

.page-contact .pc-sample {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-contact .pc-sample__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  padding: 10px 12px;
  border-left: 3px solid var(--rust);
  background: rgba(217, 72, 43, .07);
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-contact .pc-sample__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-contact .pc-why__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ---------- 04 sla ---------- */

.page-contact .pc-sla__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-contact .sla {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 3.4vw, 34px);
}

.page-contact .sla__seg {
  position: relative;
  padding-top: 22px;
}

.page-contact .sla__seg::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--pc-line-dark);
}

.page-contact .sla__seg::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  transition: width .5s ease;
}

.page-contact .sla__seg--fast::after {
  width: 18%;
  background: var(--cyan);
}

.page-contact .sla__seg--mid::after {
  width: 52%;
  background: var(--gold);
}

.page-contact .sla__seg--full::after {
  width: 100%;
  background: linear-gradient(90deg, var(--magenta), var(--cyan));
}

.page-contact .sla__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-contact .sla__value .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 8vw, 52px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-contact .sla__seg--mid .sla__value .num {
  color: var(--gold);
}

.page-contact .sla__seg--full .sla__value .num {
  color: var(--magenta);
  font-size: clamp(30px, 7vw, 46px);
}

.page-contact .sla__unit {
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--pc-soft);
}

.page-contact .sla__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  margin: 12px 0 0;
  color: var(--mist);
}

.page-contact .sla__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--pc-soft);
  max-width: 40em;
}

.page-contact .pc-sla__fig {
  margin: 0;
  border: 1px solid var(--pc-line-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-contact .pc-sla__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

/* ---------- 05 topics ---------- */

.page-contact .topics {
  border-top: 1px solid var(--pc-line);
}

.page-contact .topic {
  border-bottom: 1px solid var(--pc-line);
}

.page-contact .topic__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px 16px;
  padding: 18px 0;
  list-style: none;
  cursor: pointer;
}

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

.page-contact .topic__sum:focus-visible {
  outline: 2px solid var(--cyan-deep);
  outline-offset: 2px;
}

.page-contact .topic__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--rust);
}

.page-contact .topic__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(18px, 2.8vw, 22px);
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.page-contact .topic__cue {
  padding: 3px 9px;
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate);
  white-space: nowrap;
}

.page-contact .topic__cue::before {
  content: "展开";
}

.page-contact .topic[open] .topic__cue {
  color: var(--cyan-deep);
  border-color: var(--cyan-deep);
}

.page-contact .topic[open] .topic__cue::before {
  content: "收起";
}

.page-contact .topic__body {
  padding: 0 0 24px clamp(0px, 5vw, 62px);
  max-width: 70ch;
}

.page-contact .topic__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-contact .topic__body .topic__sample {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
  border-left: 2px solid var(--rust);
  padding-left: 12px;
  overflow-wrap: anywhere;
}

/* ---------- 06 partner ---------- */

.page-contact .pc-partner__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

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

.page-contact .ptn {
  position: relative;
  padding: 20px 22px 20px 22px;
  border: 1px solid var(--pc-line);
  border-radius: var(--radius);
  background: rgba(251, 249, 244, .7);
}

.page-contact .ptn:nth-child(2) {
  margin-left: 0;
}

.page-contact .ptn__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-contact .ptn__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  margin: 6px 0 0;
}

.page-contact .ptn__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

.page-contact .ptn__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--pc-line-soft);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cyan-deep);
  overflow-wrap: anywhere;
}

@media (min-width: 900px) {
  .page-contact .pc-partner__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ---------- 07 prep ---------- */

.page-contact .pc-prep__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-contact .pc-band--dark .pc-why__text {
  color: var(--pc-soft);
}

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

.page-contact .prep-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--pc-line-dark);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color .18s ease, border-color .18s ease;
}

.page-contact .prep-label:hover {
  background: rgba(251, 249, 244, .06);
  border-color: rgba(18, 227, 209, .5);
}

.page-contact .prep-box {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  border: 1px solid rgba(251, 249, 244, .45);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
}

.page-contact .prep-box:checked {
  border-color: var(--cyan);
  background: var(--cyan);
}

.page-contact .prep-box:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border: solid var(--midnight);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.page-contact .prep-box:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-contact .prep-text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--pc-soft);
}

.page-contact .prep-text b {
  color: var(--mist);
  font-weight: 700;
}

.page-contact .prep-done {
  display: none;
  margin: 16px 0 0;
  padding: 13px 15px;
  border-left: 3px solid var(--cyan);
  background: rgba(18, 227, 209, .1);
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.72;
  overflow-wrap: anywhere;
}

.page-contact .prep-check:not(:has(input:not(:checked))) .prep-done {
  display: block;
}

@media (min-width: 900px) {
  .page-contact .pc-prep__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .sla__seg::after,
  .page-contact .copy-btn,
  .page-contact .prep-label {
    transition: none;
  }
}