/* ================= 帮助中心 /help/ ================= */
.page-faq {
  --faq-cut: 14px;
  --faq-gap: clamp(18px, 3vw, 30px);
  --faq-prose: 38em;
  padding: clamp(22px, 4vw, 40px) 0 clamp(56px, 8vw, 96px);
  color: var(--ivory);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: 16px;
  margin-top: clamp(12px, 2vw, 20px);
  padding-bottom: clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 6.6vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.015em;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: var(--faq-prose);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(245, 247, 246, 0.82);
}

.page-faq .faq-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--slate);
}

.page-faq .faq-hero__num {
  display: inline-block;
  margin-right: 6px;
  font-size: 19px;
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

/* ---------- 三步上手 ---------- */
.page-faq .faq-steps {
  margin-top: clamp(32px, 5vw, 58px);
}

.page-faq .faq-steps__line {
  display: block;
  width: 100%;
  height: 4px;
  margin: 18px 0 24px;
}

.page-faq .faq-steps__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-step {
  position: relative;
  padding: 20px 18px 22px;
  background: linear-gradient(170deg, var(--steel) 0%, rgba(22, 40, 60, 0.5) 100%);
  border: 1px solid var(--line);
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
  transition: transform var(--speed) ease, border-color var(--speed) ease;
}

.page-faq .faq-step:hover {
  transform: translateY(-3px);
  border-color: rgba(53, 240, 208, 0.5);
}

.page-faq .faq-step__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 38px;
  padding: 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-faq .faq-step__title {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.3;
}

.page-faq .faq-step__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 247, 246, 0.8);
}

.page-faq .faq-step__demo {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 配图 ---------- */
.page-faq .faq-figure {
  margin: 0;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: repeating-linear-gradient(135deg, var(--steel) 0 12px, rgba(53, 240, 208, 0.06) 12px 24px);
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
}

.page-faq .faq-steps__media {
  margin-top: clamp(24px, 4vw, 42px);
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(40px, 6vw, 76px);
}

.page-faq .faq-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-toc__link {
  display: block;
  white-space: nowrap;
  padding: 9px 14px;
  font-size: 14px;
  color: var(--ivory);
  text-decoration: none;
  border: 1px solid var(--line);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color var(--speed) ease, border-color var(--speed) ease, background var(--speed) ease;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(53, 240, 208, 0.08);
}

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

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

/* ---------- 分组与问答条目 ---------- */
.page-faq .faq-group {
  padding-top: clamp(20px, 3vw, 30px);
  margin-bottom: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-faq .faq-group:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-faq .faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 900;
  line-height: 1.25;
}

.page-faq .faq-group__title::before {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  background: var(--cyan);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-faq .faq-group__intro {
  max-width: 46em;
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .faq-item {
  position: relative;
  padding-left: 14px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-color var(--speed) ease;
}

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

.page-faq .faq-item summary {
  position: relative;
  padding: 16px 34px 16px 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
  transition: color var(--speed) ease;
}

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

.page-faq .faq-item summary::marker {
  content: "";
}

.page-faq .faq-item summary::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 4px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-faq .faq-item[open] summary::after {
  content: "–";
  color: var(--gold);
}

.page-faq .faq-item summary:hover {
  color: var(--cyan);
}

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

.page-faq .faq-item__a {
  padding: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 247, 246, 0.82);
}

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

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

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

/* ---------- 勘误面板 ---------- */
.page-faq .faq-fix {
  margin: 18px 0 22px;
  padding: 20px 18px 18px;
  background: linear-gradient(160deg, rgba(242, 178, 60, 0.1), rgba(22, 40, 60, 0.6));
  border: 1px solid rgba(242, 178, 60, 0.32);
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
}

.page-faq .faq-fix__lead {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--gold);
}

.page-faq .faq-fix__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-fix__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 10px;
  font-size: 14px;
  line-height: 1.7;
}

.page-faq .faq-fix__num {
  grid-row: span 2;
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-faq .faq-fix__item strong {
  font-size: 15px;
  color: var(--ivory);
}

.page-faq .faq-fix__item span:last-child {
  color: rgba(245, 247, 246, 0.72);
}

.page-faq .faq-fix__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(242, 178, 60, 0.26);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 247, 246, 0.78);
}

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

/* ---------- 术语卡片 ---------- */
.page-faq .faq-terms {
  margin-top: clamp(34px, 5vw, 62px);
}

.page-faq .faq-terms__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
  margin-top: 18px;
}

.page-faq .faq-terms__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-term {
  padding: 18px 18px 20px;
  background: var(--paper);
  color: #1A1712;
  clip-path: polygon(var(--faq-cut) 0, 100% 0, 100% calc(100% - var(--faq-cut)), calc(100% - var(--faq-cut)) 100%, 0 100%, 0 var(--faq-cut));
}

.page-faq .faq-term__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: #7A6A4E;
}

.page-faq .faq-term__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
}

.page-faq .faq-term__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #443C30;
}

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-fix__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-faq .faq-steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-body {
    grid-template-columns: minmax(190px, 230px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc__link {
    white-space: normal;
  }
}

@media (min-width: 1040px) {
  .page-faq .faq-terms__layout {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    align-items: start;
  }

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

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-item,
  .page-faq .faq-toc__link {
    transition: none;
  }

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