/* ============ 知识中心 / page-faq ============ */

.page-faq {
  --faq-accent: var(--signal);
  --faq-side: 250px;
  display: block;
  background: var(--paper);
  color: var(--ink-900);
  padding-bottom: 84px;
}

/* ---------- 页首 ---------- */

.page-faq .faq-masthead {
  padding: 30px 0 34px;
  border-bottom: 1px solid var(--gray-300);
  background:
    linear-gradient(180deg, var(--gray-100) 0%, rgba(238, 240, 243, 0) 82%);
}

.page-faq .faq-masthead .breadcrumb {
  margin-bottom: 22px;
}

.page-faq .faq-masthead__grid {
  display: grid;
  gap: 30px;
}

.page-faq .faq-masthead__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  color: var(--signal-deep);
}

.page-faq .faq-masthead__kicker::before {
  content: "";
  flex: none;
  width: 26px;
  height: 2px;
  background: var(--signal);
}

.page-faq .faq-masthead h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 7.4vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 16ch;
}

.page-faq .faq-masthead__text {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--gray-500);
}

.page-faq .faq-masthead__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--gray-300);
}

.page-faq .faq-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px 14px 0;
  border-bottom: 1px solid var(--gray-300);
  min-width: 0;
}

.page-faq .faq-fact:nth-child(even) {
  padding-left: 14px;
  border-left: 1px solid var(--gray-300);
}

.page-faq .faq-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.6vw, 1.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink-900);
  overflow-wrap: anywhere;
}

.page-faq .faq-fact__label {
  font-size: var(--fs-small);
  line-height: 1.5;
  color: var(--gray-500);
}

/* ---------- 四项分类进度带 ---------- */

.page-faq .clue-strip {
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-300);
}

.page-faq .clue-strip__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .clue-strip__item {
  min-width: 0;
}

.page-faq .clue-strip__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 12px 15px 0;
  border-top: 2px solid var(--gray-300);
  text-decoration: none;
  color: var(--ink-900);
  font-size: var(--fs-small);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-faq .clue-strip__item:nth-child(even) .clue-strip__link {
  padding-left: 14px;
  border-left: 1px solid var(--gray-300);
}

.page-faq .clue-strip__link:hover,
.page-faq .clue-strip__link:focus-visible {
  border-top-color: var(--signal);
  background: var(--paper);
}

.page-faq .clue-strip__num {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--signal-deep);
}

.page-faq .clue-strip__name {
  font-weight: 600;
}

/* ---------- 两栏骨架 ---------- */

.page-faq .faq-shell {
  display: grid;
  gap: 34px;
  padding-top: 36px;
}

/* ---------- 左侧线索目录 ---------- */

.page-faq .faq-subnav {
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-m);
  background: var(--paper);
  padding: 18px 18px 16px;
}

.page-faq .faq-subnav__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  color: var(--gray-500);
}

.page-faq .faq-subnav__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-subnav__link {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 6px;
  align-items: baseline;
  padding: 11px 0;
  border-top: 1px solid var(--gray-300);
  text-decoration: none;
  color: var(--gray-500);
  font-size: var(--fs-small);
  line-height: 1.5;
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-subnav__link::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 18px;
  width: 7px;
  height: 7px;
  background: transparent;
  transition: background var(--t-fast) var(--ease);
}

.page-faq .faq-subnav__link:hover,
.page-faq .faq-subnav__link:focus-visible {
  color: var(--ink-900);
}

.page-faq .faq-subnav__link:hover::before,
.page-faq .faq-subnav__link:focus-visible::before {
  background: var(--signal);
}

.page-faq .faq-subnav__num {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--signal-deep);
}

.page-faq .faq-subnav__help {
  display: block;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--gray-300);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.04em;
  color: var(--legacy);
  text-decoration: none;
}

.page-faq .faq-subnav__help:hover,
.page-faq .faq-subnav__help:focus-visible {
  color: var(--ink-900);
}

/* ---------- 右侧问答主体 ---------- */

.page-faq .faq-body {
  display: grid;
  gap: 46px;
  min-width: 0;
}

.page-faq .faq-clue {
  --faq-accent: var(--signal);
  min-width: 0;
}

.page-faq .faq-clue--account {
  --faq-accent: var(--volt);
}

.page-faq .faq-clue--client {
  --faq-accent: var(--legacy);
}

.page-faq .faq-clue--version {
  --faq-accent: var(--ink-900);
}

.page-faq .faq-clue__head {
  position: relative;
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
  padding-left: 20px;
}

.page-faq .faq-clue__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--faq-accent);
}

.page-faq .faq-clue__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  color: var(--faq-accent);
}

.page-faq .faq-clue__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -0.005em;
}

.page-faq .faq-clue__text {
  margin: 0;
  max-width: 54ch;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--gray-500);
}

/* 子分组 */

.page-faq .faq-sub {
  min-width: 0;
}

.page-faq .faq-sub + .faq-sub {
  margin-top: 34px;
}

.page-faq .faq-sub__title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--gray-300);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--fs-h3);
  line-height: 1.35;
}

/* 图 */

.page-faq .faq-figure {
  margin: 0 0 20px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-s);
  overflow: hidden;
}

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

.page-faq .faq-figure figcaption {
  position: static;
  margin: 0;
  padding: 10px 14px;
  background: var(--gray-100);
  border-top: 1px solid var(--gray-300);
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--gray-500);
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-item {
  border: 1px solid var(--gray-300);
  border-left: 3px solid var(--gray-300);
  border-radius: var(--radius-s);
  background: var(--paper);
  margin-bottom: 10px;
  min-width: 0;
  transition: border-left-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

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

.page-faq .faq-item[open] {
  border-left-color: var(--faq-accent);
  background: var(--paper);
}

.page-faq .faq-item__q {
  position: relative;
  display: block;
  padding: 15px 46px 15px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.97rem;
  line-height: 1.55;
  color: var(--ink-900);
  transition: color var(--t-fast) var(--ease);
}

.page-faq .faq-item__q::-webkit-details-marker {
  display: none;
}

.page-faq .faq-item__q::marker {
  content: "";
}

.page-faq .faq-item__q::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--faq-accent);
  transition: opacity var(--t-fast) var(--ease);
}

.page-faq .faq-item[open] .faq-item__q::after {
  content: "−";
}

.page-faq .faq-item__q:hover {
  color: var(--faq-accent);
}

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -3px;
}

.page-faq .faq-item__a {
  padding: 14px 16px 18px;
  border-top: 1px dashed var(--gray-300);
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--gray-500);
}

.page-faq .faq-item__a p {
  margin: 0 0 10px;
}

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

.page-faq .faq-mono {
  font-family: var(--font-mono);
  font-size: 0.94em;
  letter-spacing: 0.04em;
  color: var(--legacy);
  border-bottom: 1px dashed currentColor;
}

/* 有序步骤 */

.page-faq .faq-steps {
  counter-reset: faq-step;
  margin: 12px 0 0;
  padding: 14px 14px 14px 0;
  list-style: none;
  background: var(--gray-100);
  border-radius: var(--radius-s);
}

.page-faq .faq-steps li {
  counter-increment: faq-step;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 6px;
  padding: 7px 0 7px 14px;
  line-height: 1.65;
  color: var(--ink-700);
}

.page-faq .faq-steps li::before {
  content: counter(faq-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--legacy);
  padding-top: 2px;
}

/* ---------- 兜底联系区 ---------- */

.page-faq .faq-help {
  border-radius: var(--radius-l);
  padding: 30px 22px;
  min-width: 0;
}

.page-faq .faq-help__kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
  color: var(--gray-300);
}

.page-faq .faq-help__kicker::before {
  content: "";
  flex: none;
  width: 22px;
  height: 2px;
  background: var(--signal);
}

.page-faq .faq-help h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.18;
  color: var(--paper);
}

.page-faq .faq-help__lead p {
  margin: 16px 0 22px;
  max-width: 48ch;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--gray-300);
}

.page-faq .faq-help__contact {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: 1px solid rgba(251, 250, 247, 0.22);
}

.page-faq .faq-help__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(251, 250, 247, 0.22);
  min-width: 0;
}

.page-faq .faq-help__row dt {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--gray-300);
}

.page-faq .faq-help__row dd {
  margin: 0;
  font-size: var(--fs-body);
  color: var(--paper);
  overflow-wrap: anywhere;
}

/* ---------- 相关页面 ---------- */

.page-faq .faq-related {
  border-top: 2px solid var(--ink-900);
  padding-top: 18px;
  min-width: 0;
}

.page-faq .faq-related__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.12em;
  color: var(--gray-500);
}

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

.page-faq .faq-related__list li {
  border-top: 1px solid var(--gray-300);
}

.page-faq .faq-related__list a {
  display: block;
  padding: 12px 0;
  color: var(--ink-900);
  text-decoration: none;
  font-size: var(--fs-small);
  line-height: 1.6;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-faq .faq-related__list a:hover,
.page-faq .faq-related__list a:focus-visible {
  color: var(--signal-deep);
  padding-left: 8px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-masthead {
    padding: 38px 0 40px;
  }

  .page-faq .clue-strip__link {
    padding: 17px 16px 17px 0;
  }

  .page-faq .clue-strip__item:nth-child(even) .clue-strip__link {
    padding-left: 18px;
  }

  .page-faq .faq-item__q {
    padding: 16px 54px 16px 20px;
    font-size: 1rem;
  }

  .page-faq .faq-item__q::after {
    right: 20px;
    top: 15px;
  }

  .page-faq .faq-item__a {
    padding: 16px 20px 20px;
  }

  .page-faq .faq-help {
    padding: 40px 34px;
  }
}

@media (min-width: 720px) {
  .page-faq .clue-strip__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .clue-strip__item:nth-child(even) .clue-strip__link {
    padding-left: 0;
  }

  .page-faq .clue-strip__item + .clue-strip__item .clue-strip__link {
    padding-left: 18px;
    border-left: 1px solid var(--gray-300);
  }

  .page-faq .faq-related__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-masthead__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
  }

  .page-faq .faq-help__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-faq .faq-help {
    padding: 48px 44px;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-side) minmax(0, 1fr);
    gap: 56px;
    padding-top: 46px;
  }

  .page-faq .faq-subnav {
    position: sticky;
    top: 106px;
  }

  .page-faq .faq-body {
    gap: 56px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .clue-strip__link,
  .page-faq .faq-item,
  .page-faq .faq-subnav__link,
  .page-faq .faq-subnav__link::before,
  .page-faq .faq-item__q,
  .page-faq .faq-item__q::after,
  .page-faq .faq-related__list a {
    transition: none;
  }
}