.page-contact {
  --c-panel: var(--ink-700);
  --c-line: var(--ink-600);
  --c-accent: var(--signal-cyan-400);
  --c-accent-deep: var(--signal-cyan-700);
  --c-amber: var(--archive-amber-400);
  --c-violet: var(--archive-violet-500);
  --c-text: var(--text-slate-100);
  --c-muted: var(--text-slate-400);

  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
  color: var(--c-text);
}

/* ---------- 首屏 ---------- */

.page-contact .contact-hero {
  position: relative;
  margin-top: clamp(14px, 2vw, 24px);
  padding: clamp(24px, 5vw, 52px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--c-line);
  background:
    radial-gradient(120% 140% at 8% -20%, rgba(53, 240, 200, 0.16), transparent 62%),
    radial-gradient(90% 130% at 100% 0%, rgba(124, 108, 245, 0.2), transparent 66%),
    linear-gradient(180deg, var(--deep-ink-850), var(--deep-ink-950));
  overflow: hidden;
}

.page-contact .contact-hero h1 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  max-width: 18ch;
}

.page-contact .contact-hero .lede {
  max-width: 62ch;
  margin: 0;
  color: var(--text-slate-400);
  font-size: var(--step-1);
  line-height: 1.8;
}

.page-contact .contact-stats {
  display: grid;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 38px);
  grid-template-columns: 1fr;
}

.page-contact .stat {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-line);
  background: var(--surface-glass);
}

.page-contact .stat__num {
  display: block;
  font-size: var(--step-3);
  line-height: 1.05;
  color: var(--c-accent);
  letter-spacing: -0.02em;
}

.page-contact .stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--step--1);
  color: var(--c-muted);
}

.page-contact .contact-banner {
  margin: clamp(18px, 3vw, 30px) 0 clamp(32px, 5vw, 60px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--c-line);
  overflow: hidden;
  background: var(--deep-ink-850);
}

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

/* ---------- 分屏骨架 ---------- */

.page-contact .contact-layout {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

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

.page-contact .contact-col-side {
  min-width: 0;
}

.page-contact .section {
  margin-bottom: clamp(40px, 6vw, 72px);
}

.page-contact .section:last-child {
  margin-bottom: 0;
}

.page-contact .section-head {
  margin-bottom: clamp(18px, 3vw, 28px);
}

/* ---------- 反馈表单 ---------- */

.page-contact .feedback-panel {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  padding: clamp(20px, 3.2vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--ink-700), var(--deep-ink-850));
}

.page-contact .field-group {
  display: grid;
  gap: 14px;
  padding-bottom: clamp(16px, 2.6vw, 24px);
  border-bottom: 1px solid var(--c-line);
}

.page-contact .field-group:last-of-type {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-contact .group-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-contact .group-title__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: rgba(53, 240, 200, 0.14);
  color: var(--c-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-contact .field-grid {
  display: grid;
  gap: 14px;
}

.page-contact .field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-contact .field label {
  font-size: var(--step--1);
  color: var(--c-muted);
  letter-spacing: 0.02em;
}

.page-contact .control {
  box-sizing: border-box;
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--c-line);
  background: var(--deep-ink-950);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.page-contact .control::placeholder {
  color: #5A6A88;
}

.page-contact .control:focus {
  outline: none;
  border-color: var(--c-accent);
  background: var(--deep-ink-850);
  box-shadow: 0 0 0 3px rgba(53, 240, 200, 0.16), 0 0 18px rgba(53, 240, 200, 0.14);
}

.page-contact .control--area {
  min-height: 132px;
  resize: vertical;
  font-family: var(--font-body);
}

.page-contact select.control {
  appearance: none;
  padding-right: 42px;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--c-muted) 50%),
    linear-gradient(135deg, var(--c-muted) 50%, transparent 50%);
  background-position: calc(100% - 21px) calc(50% - 2px), calc(100% - 15px) calc(50% - 2px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}

.page-contact .field-help {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--c-muted);
}

.page-contact .submit-row {
  display: grid;
  gap: 16px;
  padding-top: clamp(16px, 2.6vw, 24px);
  border-top: 1px solid var(--c-line);
}

.page-contact .submit-btn {
  justify-self: start;
  padding: 14px 36px;
  border: 0;
  border-radius: 999px;
  background-image: linear-gradient(100deg, var(--c-accent), var(--c-accent-deep));
  color: var(--deep-ink-950);
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-image 0.25s ease, box-shadow 0.25s ease, transform 0.18s ease;
}

.page-contact .submit-btn:hover,
.page-contact .submit-btn:focus-visible {
  background-image: linear-gradient(100deg, var(--c-accent), var(--c-amber));
  box-shadow: 0 12px 32px rgba(53, 240, 200, 0.24);
  transform: translateY(-2px);
  outline: none;
}

.page-contact .privacy-note {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--c-muted);
}

.page-contact .privacy-note a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 三类反馈写法 ---------- */

.page-contact .qa-list {
  display: grid;
  gap: 12px;
}

.page-contact .qa {
  border-radius: var(--radius-md);
  border: 1px solid var(--c-line);
  background: var(--deep-ink-850);
  overflow: hidden;
}

.page-contact .qa[open] {
  border-color: var(--c-accent-deep);
}

.page-contact .qa summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

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

.page-contact .qa summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--c-accent);
}

.page-contact .qa[open] summary::after {
  content: "−";
  color: var(--c-amber);
}

.page-contact .qa__body {
  padding: 4px 20px 20px;
  border-top: 1px solid var(--c-line);
}

.page-contact .qa__body p {
  margin: 14px 0 10px;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--c-muted);
}

.page-contact .qa__body ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 18px;
  font-size: var(--step-0);
  line-height: 1.72;
  color: var(--c-muted);
}

.page-contact .qa__body li::marker {
  color: var(--c-accent);
}

/* ---------- 处理节点 ---------- */

.page-contact .timeline-figure {
  margin-bottom: clamp(20px, 3vw, 32px);
}

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

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

.page-contact .timeline-cards .card {
  display: grid;
  gap: 8px;
  border-left: 3px solid var(--c-line);
}

.page-contact .timeline-cards .card:nth-child(2) {
  border-left-color: var(--c-amber);
}

.page-contact .timeline-cards .card:nth-child(3) {
  border-left-color: var(--c-accent);
}

.page-contact .timeline-cards .card__meta {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-contact .timeline-cards .card__title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-contact .timeline-cards .card__text {
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 帮助入口 ---------- */

.page-contact .help-entries {
  display: grid;
  gap: 14px;
}

.page-contact .help-entry {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  background: var(--deep-ink-850);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.page-contact .help-entry:hover,
.page-contact .help-entry:focus-visible {
  border-color: var(--c-accent-deep);
  background: var(--ink-700);
  transform: translateY(-3px);
  outline: none;
}

.page-contact .help-entry__num {
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  color: var(--c-accent);
}

.page-contact .help-entry__title {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-contact .help-entry__desc {
  font-size: var(--step-0);
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---------- 侧栏 ---------- */

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

.page-contact .side-card {
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  background: linear-gradient(180deg, var(--ink-700), var(--deep-ink-850));
}

.page-contact .side-card__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-contact .side-card__title::after {
  content: "";
  display: block;
  width: 36px;
  height: 2px;
  margin-top: 10px;
  border-radius: 2px;
  background: var(--c-accent);
}

.page-contact .side-card__text {
  margin: 0 0 6px;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--c-muted);
}

.page-contact .channel-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-contact .channel {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-line);
  background: rgba(7, 13, 28, 0.6);
}

.page-contact .channel__value {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.4;
  color: var(--c-text);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-contact .channel__desc {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.68;
  color: var(--c-muted);
}

.page-contact .timing-num {
  display: block;
  font-size: var(--step-4);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--c-accent);
}

.page-contact .timing-unit {
  margin: 8px 0 16px;
  font-size: var(--step--1);
  color: var(--c-muted);
}

.page-contact .timing-track {
  height: 6px;
  margin-bottom: 16px;
  border-radius: 999px;
  background: var(--c-line);
  overflow: hidden;
}

.page-contact .timing-track span {
  display: block;
  width: 70%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-deep));
}

.page-contact .timing-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--c-muted);
}

.page-contact .timing-list li {
  display: flex;
  gap: 10px;
}

.page-contact .timing-list li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--c-accent);
}

.page-contact .side-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-line);
  background: rgba(7, 13, 28, 0.6);
  color: var(--c-accent);
  font-size: var(--step-0);
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.page-contact .side-link:hover,
.page-contact .side-link:focus-visible {
  border-color: var(--c-accent-deep);
  background: rgba(53, 240, 200, 0.08);
  transform: translateX(3px);
  outline: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-contact .contact-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-contact .submit-row {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 26px;
  }

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

@media (min-width: 860px) {
  .page-contact .timeline-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-contact .timeline-cards > *:nth-child(2) {
    margin-top: 28px;
  }

  .page-contact .timeline-cards > *:nth-child(3) {
    margin-top: 14px;
  }
}

@media (min-width: 1000px) {
  .page-contact .contact-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-contact .contact-col-side {
    position: sticky;
    top: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-contact .submit-btn,
  .page-contact .help-entry,
  .page-contact .side-link,
  .page-contact .control {
    transition: none;
  }

  .page-contact .submit-btn:hover,
  .page-contact .help-entry:hover,
  .page-contact .side-link:hover {
    transform: none;
  }
}