.page-contact {
  --contact-pad: clamp(48px, 7vw, 96px);
  display: block;
  color: var(--c-white);
  font-family: var(--font-body);
  background-color: var(--c-pitch);
  background-image:
    radial-gradient(900px 520px at 88% -8%, rgba(59, 240, 208, 0.09), transparent 70%),
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: auto, 24px 24px, 24px 24px;
  padding-bottom: 64px;
}

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

.page-contact .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-contact .contact-hero {
  display: grid;
  gap: 28px;
  padding: 28px 0 44px;
  border-bottom: 1px solid var(--hairline);
}

.page-contact .hero-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.14em;
  color: var(--c-index);
}

.page-contact h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-6);
  line-height: 1.02;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.page-contact .hero-lead {
  margin: 0;
  max-width: 40ch;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--c-white);
}

.page-contact .sla {
  margin-top: 28px;
  padding: 20px 22px;
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--c-neon);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(16, 64, 58, 0.92), rgba(4, 33, 29, 0.55));
}

.page-contact .sla-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-contact .sla-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(56px, 14vw, 96px);
  line-height: 0.85;
  letter-spacing: -0.02em;
  color: var(--c-neon);
  font-variant-numeric: tabular-nums;
}

.page-contact .sla-unit {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-4);
  color: var(--c-white);
}

.page-contact .sla-note {
  margin: 12px 0 0;
  max-width: 44ch;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--c-index);
}

.page-contact .hero-media {
  --ratio: 3 / 2;
  margin: 0;
  position: relative;
}

.page-contact .hero-media::after {
  content: "LIVE 48kHz";
  position: absolute;
  right: 10px;
  bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.14em;
  color: var(--c-timer);
  background: rgba(4, 33, 29, 0.72);
  padding: 4px 8px;
  border: 1px solid var(--glass-line);
}

.page-contact .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
}

/* ---------- 章节通用 ---------- */
.page-contact .section {
  padding-top: var(--contact-pad);
}

.page-contact .section-head {
  max-width: 62ch;
  margin-bottom: 28px;
}

.page-contact .section-index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.16em;
  color: var(--c-neon);
}

.page-contact .section-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-5);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.page-contact .section-sub {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--c-index);
}

/* ---------- 渠道通讯录 ---------- */
.page-contact .channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-contact .channel-card {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 10px 16px;
  padding: 22px 4px;
  background: var(--c-pitch);
  transition: background 0.22s var(--ease);
}

.page-contact .channel-card:hover {
  background: var(--c-locker);
}

.page-contact .channel-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--c-index);
}

.page-contact .channel-main {
  min-width: 0;
}

.page-contact .channel-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-3);
  letter-spacing: 0.04em;
  color: var(--c-white);
}

.page-contact .channel-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  line-height: 1.5;
  color: var(--c-neon);
  overflow-wrap: anywhere;
}

.page-contact .channel-use {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  max-width: 60ch;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--c-index);
}

/* ---------- 事由分流 ---------- */
.page-contact .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-contact .filter-btn {
  appearance: none;
  padding: 8px 14px;
  font-family: var(--font-body);
  font-size: var(--step-1);
  color: var(--c-white);
  background: rgba(16, 64, 58, 0.6);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-contact .filter-btn:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.page-contact .filter-btn[aria-pressed="true"] {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: var(--c-pitch);
  font-weight: 600;
}

.page-contact .filter-btn:focus-visible,
.page-contact .panel-trigger:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
}

.page-contact .route-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-contact .route-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 20px;
  background: var(--c-locker);
  border: 1px solid var(--hairline);
  border-left: 2px solid var(--c-neon-deep);
  border-radius: var(--radius);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-contact .route-card:hover {
  border-color: var(--c-neon);
  border-left-color: var(--c-orange);
  transform: translateY(-2px);
}

.page-contact .route-card .card-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.1em;
  color: var(--c-neon);
  border: 1px solid var(--glass-line);
  padding: 3px 8px;
  border-radius: var(--radius);
}

.page-contact .route-card .card-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-3);
  line-height: 1.25;
  color: var(--c-white);
}

.page-contact .route-card .card-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.06em;
  color: var(--c-index);
}

.page-contact .route-card .card-body {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--c-white);
}

.page-contact .route-tip {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--hairline);
  font-family: var(--font-mono);
  font-size: var(--step-0);
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--c-index);
}

.page-contact .filter-empty {
  margin: 20px 0 0;
  font-size: var(--step-1);
  color: var(--c-index);
}

.page-contact .is-filtered-out {
  display: none;
}

/* ---------- 邮件标题 ---------- */
.page-contact .subject-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-contact .subject-card {
  padding: 22px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(16, 64, 58, 0.85), rgba(10, 47, 40, 0.65));
}

.page-contact .subject-label {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-1);
  letter-spacing: 0.12em;
  color: var(--c-orange);
}

.page-contact .subject-line {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  line-height: 1.6;
  color: var(--c-neon);
  overflow-wrap: anywhere;
}

.page-contact .subject-hint {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--c-index);
}

.page-contact .subject-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-timer);
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--c-white);
}

/* ---------- 服务范围 ---------- */
.page-contact .contact-region {
  display: grid;
  gap: 28px;
}

.page-contact .region-text {
  margin: 0 0 24px;
  max-width: 44ch;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--c-white);
}

.page-contact .region-stats {
  display: grid;
  gap: 14px;
  margin: 0 0 24px;
  grid-template-columns: 1fr;
}

.page-contact .region-stat {
  padding: 14px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: rgba(10, 47, 40, 0.7);
}

.page-contact .stat-label {
  margin: 0 0 6px;
  font-size: var(--step-0);
  letter-spacing: 0.08em;
  color: var(--c-index);
}

.page-contact .stat-num {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--step-4);
  letter-spacing: -0.01em;
  color: var(--c-timer);
  font-variant-numeric: tabular-nums;
}

.page-contact .region-contact {
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
}

.page-contact .region-line {
  margin: 0 0 8px;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--c-white);
}

.page-contact .region-key {
  display: inline-block;
  min-width: 72px;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  letter-spacing: 0.08em;
  color: var(--c-index);
}

.page-contact .region-media {
  --ratio: 25 / 16;
  margin: 0;
}

/* ---------- 常见问题 ---------- */
.page-contact .panel-list {
  border-top: 1px solid var(--hairline);
}

.page-contact .panel {
  border-bottom: 1px solid var(--hairline);
}

.page-contact .panel-heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-contact .panel-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 2px;
  background: none;
  border: 0;
  color: var(--c-white);
  font-family: var(--font-body);
  font-size: var(--step-2);
  line-height: 1.5;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.page-contact .panel-trigger:hover {
  color: var(--c-neon);
}

.page-contact .panel-trigger::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--step-3);
  color: var(--c-neon);
}

.page-contact .panel-trigger[aria-expanded="true"] {
  color: var(--c-neon);
}

.page-contact .panel-trigger[aria-expanded="true"]::after {
  content: "–";
  color: var(--c-orange);
}

.page-contact .panel-body {
  display: none;
}

.page-contact .panel-body[data-open="true"] {
  display: block;
}

.page-contact .panel-body-inner {
  padding: 0 2px 22px;
  max-width: 66ch;
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--c-index);
}

.page-contact .panel-body-inner p {
  margin: 0;
}

.page-contact .faq-more {
  margin: 28px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--c-neon);
  border-radius: var(--radius);
  background: rgba(10, 47, 40, 0.6);
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--c-white);
}

.page-contact .faq-more a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-contact .faq-more a:hover {
  color: var(--c-orange);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-contact .route-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-contact .region-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-contact .contact-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
    padding: 52px 0 72px;
  }

  .page-contact .hero-media {
    align-self: stretch;
  }

  .page-contact .channel-card {
    grid-template-columns: 64px minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
    padding: 28px 8px;
  }

  .page-contact .channel-use {
    grid-column: auto;
    margin-top: 0;
  }

  .page-contact .route-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-contact .contact-region {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    gap: 48px;
  }

  .page-contact .region-media {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1200px) {
  .page-contact .hero-lead {
    font-size: var(--step-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .channel-card,
  .page-contact .filter-btn,
  .page-contact .route-card,
  .page-contact .panel-trigger {
    transition: none;
  }

  .page-contact .route-card:hover {
    transform: none;
  }
}