.page-contact {
  --rail-w: 320px;
  --rail-top: 104px;
  padding-bottom: 7rem;
}

/* ---------- 首屏 ---------- */
.page-contact .coop-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
}

.page-contact .coop-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 62vw;
  height: 62vw;
  max-width: 780px;
  max-height: 780px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 16, 46, 0.26), transparent 68%);
  pointer-events: none;
}

.page-contact .coop-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.4rem;
  padding-block: 2.25rem 3rem;
}

.page-contact .coop-hero__title {
  margin: 1.1rem 0 1.1rem;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.025em;
  color: var(--paper);
  max-width: 18ch;
}

.page-contact .coop-hero__lead {
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-contact .coop-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-contact .coop-hero__figure {
  position: relative;
}

.page-contact .coop-hero__figure .figure__img {
  border-radius: var(--radius-m);
}

@media (min-width: 900px) {
  .page-contact .coop-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    align-items: center;
    gap: 3.5rem;
    padding-block: 3.25rem 4.5rem;
  }
}

/* ---------- 分屏主体 ---------- */
.page-contact .coop-body {
  display: grid;
  gap: 3rem;
  padding-top: 3.25rem;
}

@media (min-width: 1024px) {
  .page-contact .coop-body {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 4rem;
    align-items: start;
  }
}

/* ---------- 左侧固定联系面板 ---------- */
.page-contact .coop-rail__card {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 1.4rem 1.25rem 1.35rem;
  background:
    linear-gradient(158deg, rgba(74, 18, 32, 0.62), rgba(11, 14, 19, 0.94) 62%),
    var(--ink);
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.9);
}

@media (min-width: 1024px) {
  .page-contact .coop-rail__card {
    position: sticky;
    top: var(--rail-top);
  }
}

.page-contact .coop-rail__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-flag);
  margin-bottom: 1.1rem;
}

.page-contact .coop-rail__list {
  display: grid;
  gap: 1rem;
  margin: 0;
}

.page-contact .coop-rail__row dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.3rem;
}

.page-contact .coop-rail__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-contact .coop-rail__hint {
  margin-top: 1.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .coop-rail__index {
  display: none;
}

@media (min-width: 1024px) {
  .page-contact .coop-rail__index {
    display: grid;
    gap: 0.1rem;
    margin-top: 1.25rem;
    padding-top: 1.1rem;
    border-top: 1px solid var(--line-soft);
  }
}

.page-contact .coop-rail__index a {
  display: block;
  padding: 0.42rem 0.7rem;
  font-size: 0.875rem;
  color: var(--mist);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.page-contact .coop-rail__index a:hover,
.page-contact .coop-rail__index a:focus-visible,
.page-contact .coop-rail__index a.is-active {
  color: var(--paper);
  border-left-color: var(--red);
  background: rgba(200, 16, 46, 0.14);
}

/* ---------- 章节 ---------- */
.page-contact .chapter {
  scroll-margin-top: 110px;
}

.page-contact .chapter + .chapter {
  margin-top: 4.25rem;
}

.page-contact .chapter__head h2 {
  margin: 0.85rem 0 0.65rem;
  font-size: clamp(1.5rem, 4.2vw, 2.125rem);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 22ch;
}

.page-contact .chapter__lead {
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作方向 ---------- */
.page-contact .track-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.9rem;
}

.page-contact .track {
  --accent: var(--gold);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-m);
  background: var(--surface);
  overflow: hidden;
  transition: border-color var(--ease), background-color var(--ease);
}

.page-contact .track--jade {
  --accent: #1c6b6f;
  background: linear-gradient(120deg, rgba(14, 46, 51, 0.85), rgba(20, 28, 43, 0.98) 58%);
}

.page-contact .track--wine {
  --accent: var(--red);
  background: linear-gradient(120deg, rgba(74, 18, 32, 0.78), rgba(20, 28, 43, 0.98) 58%);
}

.page-contact .track--sky {
  --accent: var(--sky);
  background: linear-gradient(120deg, rgba(46, 155, 214, 0.16), rgba(20, 28, 43, 0.98) 58%);
}

.page-contact .track:hover {
  border-color: var(--line);
}

.page-contact .track__summary {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 1.15rem;
  grid-template-areas:
    "idx name mark"
    "idx who  mark";
  align-items: center;
  gap: 0.25rem 1rem;
  padding: 1.1rem 1.2rem;
  cursor: pointer;
  list-style: none;
}

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

.page-contact .track__summary::after {
  grid-area: mark;
  content: "＋";
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--gold);
}

.page-contact .track[open] .track__summary::after {
  content: "－";
}

.page-contact .track__index {
  grid-area: idx;
  font-family: var(--font-num);
  font-size: 1.85rem;
  line-height: 1;
  font-weight: 600;
  color: var(--accent);
}

.page-contact .track__name {
  grid-area: name;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-contact .track__who {
  grid-area: who;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

@media (min-width: 700px) {
  .page-contact .track__summary {
    grid-template-columns: auto minmax(0, 1fr) auto 1.15rem;
    grid-template-areas: "idx name who mark";
    gap: 0 1.25rem;
    padding: 1.2rem 1.35rem;
  }
}

.page-contact .track__body {
  padding: 0 1.2rem 1.3rem;
}

@media (min-width: 700px) {
  .page-contact .track__body {
    padding: 0 1.35rem 1.4rem;
  }
}

.page-contact .track__body > p {
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 60ch;
}

.page-contact .track__body a {
  color: var(--red-lit);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .track__points {
  list-style: none;
  padding: 0;
  margin: 0.95rem 0 0;
  display: grid;
  gap: 0.5rem;
}

.page-contact .track__points li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.68;
  color: var(--paper);
}

.page-contact .track__points li::before {
  content: "";
  position: absolute;
  left: 0.1rem;
  top: 0.62em;
  width: 0.36rem;
  height: 0.36rem;
  border-radius: 50%;
  background: var(--gold-flag);
}

/* ---------- 流程轴 ---------- */
.page-contact .flow {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.page-contact .flow__step {
  position: relative;
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 1.1rem;
  padding-bottom: 1.35rem;
}

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

.page-contact .flow__step::before {
  content: "";
  position: absolute;
  left: 1.125rem;
  top: 2.5rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(217, 164, 65, 0.55), rgba(217, 164, 65, 0.1));
}

.page-contact .flow__step:last-child::before {
  display: none;
}

.page-contact .flow__dot {
  position: relative;
  z-index: 1;
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 2px solid var(--ink);
  background: var(--gold-flag);
  color: var(--ink);
  font-family: var(--font-num);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-contact .flow__step:first-child .flow__dot {
  background: var(--red);
  color: var(--paper);
}

.page-contact .flow__summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 0.15rem;
  padding: 0.3rem 0 0.5rem;
}

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

.page-contact .flow__name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-contact .flow__time {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-contact .flow__panel {
  margin-top: 0.35rem;
  padding: 0.9rem 1rem 1rem;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(20, 28, 43, 0.78);
}

.page-contact .flow__panel p {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 58ch;
}

.page-contact .flow__deliver {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.75rem !important;
  letter-spacing: 0.08em;
  color: var(--sky) !important;
}

/* ---------- 联系方式 ---------- */
.page-contact .channel-grid {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.9rem;
}

@media (min-width: 720px) {
  .page-contact .channel-grid {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  }
}

.page-contact .channel {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  padding: 1.3rem 1.2rem 1.4rem;
}

.page-contact .channel--jade {
  background: linear-gradient(158deg, rgba(14, 46, 51, 0.92), rgba(20, 28, 43, 0.98) 66%);
}

.page-contact .channel--wine {
  background: linear-gradient(158deg, rgba(74, 18, 32, 0.8), rgba(20, 28, 43, 0.98) 66%);
}

.page-contact .channel--sky {
  background: linear-gradient(158deg, rgba(46, 155, 214, 0.16), rgba(20, 28, 43, 0.98) 66%);
}

.page-contact .channel__key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.7rem;
}

.page-contact .channel__val {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: anywhere;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line-soft);
  margin-bottom: 0.85rem;
}

.page-contact .channel__desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-contact .channel-figure {
  margin-top: 1.6rem;
}

.page-contact .channel-figure .figure__img {
  border-radius: var(--radius-m);
}

/* ---------- 需求材料 ---------- */
.page-contact .brief-list {
  list-style: none;
  padding: 0;
  margin: 1.9rem 0 0;
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 760px) {
  .page-contact .brief-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-contact .brief-list__item {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.85rem;
  align-items: start;
  padding: 1.05rem 1.05rem 1.1rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--surface);
  transition: border-color var(--ease), transform var(--ease);
}

.page-contact .brief-list__item:hover {
  border-color: var(--line);
  transform: translateY(-2px);
}

.page-contact .brief-list__num {
  font-family: var(--font-num);
  font-size: 1.75rem;
  line-height: 0.9;
  font-weight: 600;
  color: var(--gold-flag);
}

.page-contact .brief-list__title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 0.3rem;
}

.page-contact .brief-list__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-contact .materials-note {
  margin-top: 1.5rem;
  padding-left: 1rem;
  border-left: 2px solid var(--sky);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 58ch;
}

.page-contact .materials-note a {
  color: var(--red-lit);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 常见问题 ---------- */
.page-contact .qa-list {
  margin-top: 1.9rem;
  border-top: 1px solid var(--line-soft);
}

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

.page-contact .qa__q {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 1.1rem 2.1rem 1.1rem 0;
  font-size: 1.0313rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--paper);
}

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

.page-contact .qa__q::after {
  content: "＋";
  position: absolute;
  right: 0.15rem;
  top: 1.05rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.4;
  color: var(--gold);
}

.page-contact .qa[open] .qa__q::after {
  content: "－";
}

.page-contact .qa[open] .qa__q {
  color: var(--red-lit);
}

.page-contact .qa__a {
  padding: 0 0 1.2rem;
}

.page-contact .qa__a p {
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 桌面栅格微调 ---------- */
@media (min-width: 1024px) {
  .page-contact .coop-hero__title {
    max-width: 16ch;
  }

  .page-contact .chapter + .chapter {
    margin-top: 5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact *,
  .page-contact *::before,
  .page-contact *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-contact .brief-list__item:hover {
    transform: none;
  }
}