/* ===========================================================
   使用帮助 / faq
   =========================================================== */

.page-faq {
  --faq-card: #ffffff;
  --faq-card-line: rgba(29, 74, 122, 0.26);
  --faq-card-line-strong: rgba(29, 74, 122, 0.5);
  --faq-shadow: 0 1px 0 rgba(11, 31, 58, 0.04), 0 14px 30px -22px rgba(11, 31, 58, 0.42);
  --faq-body-text: #1F3A5C;
  --faq-link: #0A6A80;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: clamp(24px, 4.4vw, 46px);
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(29, 74, 122, 0.4) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 74, 122, 0.4) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(130% 120% at 12% -10%, #000 10%, rgba(0, 0, 0, 0.35) 46%, transparent 78%);
  mask-image: radial-gradient(130% 120% at 12% -10%, #000 10%, rgba(0, 0, 0, 0.35) 46%, transparent 78%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 9%;
  width: 1px;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(to bottom, transparent, rgba(0, 229, 255, 0.34), transparent);
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  max-width: 900px;
  font-size: clamp(32px, 5.2vw, 62px);
}

.page-faq .faq-lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 46em;
  font-size: clamp(16px, 1.32vw, 18px);
  line-height: 1.82;
  color: var(--text-dark);
}

/* ---------- 分类密度刻度条 ---------- */

.page-faq .faq-density {
  margin-top: clamp(26px, 4vw, 44px);
  padding-top: 18px;
  border-top: 1px solid var(--rule-soft);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
}

@media (min-width: 720px) {
  .page-faq .faq-density {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-faq .density-item {
  display: block;
  text-decoration: none;
  outline: none;
}

.page-faq .density-item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-faq .density-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-faq .density-label {
  font-size: 14px;
  color: var(--text-dark);
  transition: color 200ms var(--ease);
}

.page-faq .density-count {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-faq .density-bar {
  display: block;
  position: relative;
  margin-top: 9px;
  height: 3px;
  background: rgba(110, 138, 168, 0.32);
  overflow: hidden;
}

.page-faq .density-bar::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--w, 45%);
  background: linear-gradient(90deg, var(--cyan), var(--signal));
  transform-origin: left center;
  transition: transform 300ms var(--ease);
}

.page-faq .density-item:hover .density-label,
.page-faq .density-item:focus-visible .density-label {
  color: var(--cyan);
}

.page-faq .density-item:hover .density-bar::after {
  transform: scaleX(1.06);
}

/* ---------- 主体双栏 ---------- */

.page-faq .faq-body {
  padding-top: clamp(34px, 6vw, 72px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-faq .help-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

@media (min-width: 960px) {
  .page-faq .help-shell {
    grid-template-columns: 244px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ---------- 左侧索引 ---------- */

.page-faq .help-index {
  border-top: 2px solid var(--rule);
  padding-top: 14px;
}

@media (min-width: 960px) {
  .page-faq .help-index {
    position: sticky;
    top: calc(var(--header-space) + 14px);
    align-self: start;
  }
}

.page-faq .help-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-light-dim);
}

.page-faq .help-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-faq .help-index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px 9px 10px;
  border-left: 2px solid transparent;
  color: var(--text-light);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  outline: none;
  transition: border-color 200ms var(--ease), color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .help-index-list a:hover,
.page-faq .help-index-list a:focus-visible {
  border-left-color: var(--cyan);
  color: var(--ink-900);
  background: rgba(0, 229, 255, 0.09);
}

.page-faq .help-index-list a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .ix-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .help-index-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(29, 74, 122, 0.22);
  font-size: 13px;
  line-height: 1.72;
  color: var(--text-light-dim);
}

@media (max-width: 959px) {
  .page-faq .help-index-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .page-faq .help-index-list li {
    flex: 0 0 auto;
  }

  .page-faq .help-index-list a {
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 8px 12px;
    white-space: nowrap;
  }

  .page-faq .help-index-list a:hover,
  .page-faq .help-index-list a:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--cyan);
  }
}

/* ---------- 分组 ---------- */

.page-faq .help-main {
  min-width: 0;
}

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-space) + 18px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(38px, 6vw, 74px);
}

.page-faq .group-head {
  margin-bottom: 18px;
}

.page-faq .group-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-faq .group-head h2 {
  margin: 8px 0 0;
}

.page-faq .group-note {
  margin: 10px 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-light-dim);
}

.page-faq .group-head::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: 18px;
  background: linear-gradient(90deg, rgba(29, 74, 122, 0.5), rgba(29, 74, 122, 0.06));
}

/* ---------- 插图 ---------- */

.page-faq .faq-figure {
  margin: 22px 0 26px;
  padding: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid rgba(29, 74, 122, 0.3);
  border-radius: 0 var(--notch) 0 0;
  background: #ffffff;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  margin-top: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13px;
  line-height: 1.66;
  color: var(--text-light-dim);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-list {
  counter-reset: faqq;
  display: grid;
  gap: 10px;
  margin-top: 4px;
}

.page-faq .faq-item {
  counter-increment: faqq;
  background: var(--faq-card);
  border: 1px solid var(--faq-card-line);
  border-radius: 0 var(--notch) 0 0;
  box-shadow: var(--faq-shadow);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .faq-item:hover {
  transform: translateY(-2px);
  border-color: var(--faq-card-line-strong);
}

.page-faq .faq-item[open] {
  border-color: rgba(0, 229, 255, 0.55);
}

.page-faq .faq-item > summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 17px 20px;
  cursor: pointer;
  list-style: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text-light);
}

.page-faq .faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item > summary::before {
  content: counter(faqq, decimal-leading-zero);
  flex: 0 0 auto;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-item > summary::after {
  content: "";
  flex: 0 0 auto;
  width: 0;
  height: 0;
  margin-left: auto;
  margin-top: 7px;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid var(--mist);
  transition: transform 220ms var(--ease), border-top-color 220ms var(--ease);
}

.page-faq .faq-item[open] > summary::after {
  transform: rotate(180deg);
  border-top-color: var(--signal);
}

.page-faq .faq-q {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .faq-item > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-item[open] > summary {
  color: var(--ink-900);
  box-shadow: inset 3px 0 0 var(--cyan);
}

/* ---------- 答案区 ---------- */

.page-faq .faq-answer {
  margin: 0 20px;
  padding: 14px 0 20px;
  border-top: 1px solid rgba(29, 74, 122, 0.16);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--faq-body-text);
}

.page-faq .faq-answer p {
  margin: 0 0 12px;
}

.page-faq .faq-answer p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-answer a {
  color: var(--faq-link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-answer a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-answer strong {
  color: var(--ink-900);
  font-weight: 650;
}

/* 步骤条目 */

.page-faq .steps {
  list-style: none;
  counter-reset: stp;
  margin: 0;
  padding: 0;
}

.page-faq .steps > li {
  position: relative;
  counter-increment: stp;
  padding-left: 40px;
  margin-bottom: 9px;
  line-height: 1.78;
}

.page-faq .steps > li:last-child {
  margin-bottom: 0;
}

.page-faq .steps > li::before {
  content: counter(stp, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.34em;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--signal);
}

/* 简列表 */

.page-faq .plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-faq .plain-list li {
  position: relative;
  padding-left: 16px;
  line-height: 1.76;
}

.page-faq .plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--mist);
}

/* 注意事项条 */

.page-faq .faq-note {
  margin: 12px 0 0;
  padding: 10px 14px;
  border-left: 2px solid var(--amber);
  background: rgba(255, 201, 74, 0.14);
  font-size: 14px;
  line-height: 1.72;
  color: #4A3B12;
}

/* ---------- 尾段 ---------- */

.page-faq .faq-next {
  position: relative;
  overflow: hidden;
  padding-top: clamp(36px, 5.6vw, 72px);
  padding-bottom: clamp(40px, 6.4vw, 80px);
}

.page-faq .faq-next::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--rule-soft);
}

.page-faq .next-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  padding: clamp(24px, 3.6vw, 40px);
  background: var(--ink-800);
  border: 1px solid var(--rule);
  border-radius: 0 var(--notch) 0 0;
}

@media (min-width: 860px) {
  .page-faq .next-panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(28px, 4vw, 56px);
  }
}

.page-faq .next-panel h2 {
  margin: 12px 0 0;
}

.page-faq .next-text {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text-dark);
}

.page-faq .next-text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .next-text a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .next-contact {
  margin: 0;
  padding-left: clamp(0px, 2vw, 22px);
  border-left: 1px solid rgba(29, 74, 122, 0.7);
  display: grid;
  gap: 2px;
}

.page-faq .next-contact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-faq .next-contact dd {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-dark);
  overflow-wrap: anywhere;
}

.page-faq .next-contact dd:last-child {
  margin-bottom: 0;
}

@media (max-width: 859px) {
  .page-faq .next-contact {
    padding-left: 0;
    padding-top: 18px;
    border-left: 0;
    border-top: 1px solid rgba(29, 74, 122, 0.7);
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item,
  .page-faq .faq-item > summary::after,
  .page-faq .density-bar::after,
  .page-faq .help-index-list a {
    transition: none;
  }

  .page-faq .faq-item:hover {
    transform: none;
  }

  .page-faq .density-item:hover .density-bar::after {
    transform: none;
  }
}

.page-faq {
  --w: 1rem;
}