/* ========== 帮助中心 page-faq 页面专属样式 ========== */
.page-faq {
  --faq-gap: 24px;
  --faq-gap-lg: 40px;
  --faq-line-mid: 1px solid var(--color-gray-mid);
  --faq-line-gold: 2px solid var(--color-gold);
  --faq-bg-blue: var(--color-blue);
  --faq-bg-deep: #0d1f36;
  --faq-bg-soft: var(--color-gray-light);
  background: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-body);
  line-height: 1.6;
}

/* ---------- 页面上下文：面包屑 ---------- */
.faq-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(250,250,250,.7);
  margin-bottom: 24px;
}

.faq-breadcrumb a {
  color: var(--color-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

.faq-breadcrumb a:hover,
.faq-breadcrumb a:focus-visible {
  border-bottom-color: var(--color-gold);
  color: #ffd866;
}

.faq-breadcrumb span[aria-current="page"] {
  color: rgba(250,250,250,.9);
  font-family: var(--font-mono);
}

/* ---------- 首屏：英雄区 ---------- */
.faq-hero {
  background: linear-gradient(135deg, var(--faq-bg-blue) 0%, #111827 58%, var(--faq-bg-deep) 100%);
  color: var(--color-white);
  padding: 40px 0 56px;
  position: relative;
  overflow: hidden;
}

.faq-hero::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 320px;
  height: 320px;
  border: 1px solid rgba(245,183,0,.28);
  border-radius: 50%;
  pointer-events: none;
}

.faq-hero::before {
  content: "FAQ";
  position: absolute;
  right: 24px;
  bottom: -18px;
  font-family: var(--font-mono);
  font-size: clamp(88px, 16vw, 160px);
  line-height: 1;
  color: rgba(245,183,0,.06);
  letter-spacing: -.06em;
  pointer-events: none;
}

.faq-hero__inner {
  position: relative;
  z-index: 1;
}

.faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.faq-hero__copy .section-label {
  color: var(--color-gold);
  margin-bottom: 10px;
}

.faq-hero__copy h1 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5.4vw, 46px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.02em;
  margin: 0 0 16px;
  color: var(--color-white);
}

.faq-hero__desc {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(250,250,250,.88);
  max-width: 60ch;
  margin: 0 0 14px;
}

.faq-hero__note {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(245,183,0,.85);
  border-left: 3px solid var(--color-gold);
  padding-left: 10px;
  margin: 0;
}

.faq-hero__side {
  background: rgba(10,37,64,.72);
  border: 1px solid var(--color-gold);
  border-radius: 4px;
  padding: 22px 20px;
  display: grid;
  gap: 6px;
  position: relative;
  box-shadow: 0 18px 40px -18px rgba(0,0,0,.55);
}

.faq-hero__side-num {
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
  letter-spacing: -.04em;
}

.faq-hero__side-label {
  font-size: 14px;
  color: rgba(250,250,250,.85);
  letter-spacing: .02em;
}

.faq-hero__side-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(250,250,250,.6);
  border-top: 1px solid rgba(245,183,0,.25);
  padding-top: 10px;
  margin-top: 6px;
}

/* ---------- 左右布局 ---------- */
.faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 64px;
}

/* 索引目录 */
.faq-index__inner {
  border: 1px solid var(--color-gray-mid);
  background: var(--color-gray-light);
  padding: 24px 20px;
  position: relative;
}

.faq-index__inner::before {
  content: "";
  display: block;
  width: 42px;
  height: 4px;
  background: var(--color-gold);
  margin-bottom: 16px;
}

.faq-index__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-gray-dark);
  margin: 0 0 4px;
}

.faq-index__title {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 800;
  color: var(--color-black);
  margin: 0 0 18px;
  letter-spacing: -.02em;
}

.faq-index__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.faq-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 10px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-mid);
  text-decoration: none;
  color: var(--color-black);
  transition: background .2s ease, border-color .2s ease, transform .2s ease;
}

.faq-index__link:hover,
.faq-index__link:focus-visible {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
  transform: translateX(4px);
}

.faq-index__link:hover .faq-index__num,
.faq-index__link:focus-visible .faq-index__num {
  color: var(--color-gold);
}

.faq-index__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-gold);
  transition: color .2s ease;
}

.faq-index__text {
  font-size: 15px;
  font-weight: 500;
}

.faq-index__meta {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-gray-dark);
  border-top: 1px dashed var(--color-gray-mid);
  padding-top: 14px;
  margin: 0 0 16px;
}

.faq-index__btn {
  width: 100%;
  justify-content: center;
}

/* 内容面板 */
.faq-content {
  display: grid;
  gap: 64px;
  min-width: 0;
}

.faq-section__head {
  margin-bottom: 28px;
  border-bottom: var(--faq-line-mid);
  padding-bottom: 18px;
}

.faq-section__head .section-label {
  color: var(--color-blue);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.faq-section__head h2 {
  font-family: var(--font-heading);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 800;
  letter-spacing: -.02em;
  margin: 0 0 10px;
  color: var(--color-black);
}

.faq-section__lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-gray-dark);
  max-width: 64ch;
  margin: 0;
}

.faq-section__foot {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-gray-dark);
  background: var(--faq-bg-soft);
  border-left: 3px solid var(--color-gold);
  padding: 12px 16px;
  margin: 24px 0 0;
}

/* ---------- 常见问题详情面板 ---------- */
.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-gray-mid);
  transition: border-color .2s ease, box-shadow .2s ease;
}

.faq-item:hover {
  border-color: var(--color-gold);
}

.faq-item[open] {
  border-color: var(--color-gold);
  box-shadow: 4px 4px 0 rgba(10,37,64,.08);
}

.faq-item__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 16px 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-black);
  position: relative;
  transition: background .2s ease;
}

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

.faq-item__summary::before {
  content: "Q";
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-blue);
}

.faq-item__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--color-gray-dark);
  transition: transform .25s ease, color .25s ease;
}

.faq-item[open] .faq-item__summary {
  background: rgba(245,183,0,.06);
}

.faq-item[open] .faq-item__summary::after {
  transform: rotate(45deg);
  color: var(--color-gold);
}

.faq-item__summary:hover,
.faq-item__summary:focus-visible {
  outline: none;
  background: rgba(245,183,0,.08);
}

.faq-item__answer {
  padding: 4px 18px 20px 58px;
  color: var(--color-gray-dark);
  font-size: 15px;
  line-height: 1.75;
}

.faq-item__answer p {
  margin: 0;
}

.faq-item__answer p + p {
  margin-top: 10px;
}

/* ---------- 分步指引 ---------- */
.faq-steps__visual {
  margin-bottom: 28px;
  padding: 12px;
  background: var(--color-white);
  position: relative;
}

.faq-steps__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.96) contrast(1.04);
}

.faq-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: faq-step;
}

.faq-step-card {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-mid);
  padding: 18px 16px;
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.faq-step-card:hover,
.faq-step-card:focus-within {
  border-color: var(--color-blue);
  background: rgba(10,37,64,.02);
  transform: translateX(2px);
}

.faq-step-card__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-white);
  background: var(--color-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  letter-spacing: -.04em;
  position: relative;
}

.faq-step-card__num::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 12px;
  height: 12px;
  background: var(--color-gold);
  transition: transform .2s ease;
}

.faq-step-card:hover .faq-step-card__num::after {
  transform: scale(1.4);
}

.faq-step-card__title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--color-black);
}

.faq-step-card__body p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-gray-dark);
  margin: 0;
}

.faq-steps__note {
  margin-top: 24px;
  background: var(--faq-bg-soft);
  padding: 16px 18px;
}

.faq-steps__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray-dark);
}

.faq-steps__note strong {
  color: var(--color-red);
  font-weight: 700;
}

/* ---------- 新旧版对照 ---------- */
.faq-compare__visual {
  position: relative;
  margin-bottom: 28px;
  border: 1px solid var(--color-gray-mid);
  background: var(--color-gray-light);
  padding: 8px;
}

.faq-compare__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.faq-compare__badge {
  position: absolute;
  top: 18px;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 6px 12px;
  background: var(--color-white);
  border: 2px solid var(--color-black);
  box-shadow: 3px 3px 0 rgba(0,0,0,.16);
}

.faq-compare__badge--old {
  left: 18px;
  color: var(--color-black);
  border-color: var(--color-red);
}

.faq-compare__badge--new {
  right: 18px;
  color: var(--color-blue);
  border-color: var(--color-gold);
}

.faq-compare__table-wrap {
  overflow-x: auto;
  margin-bottom: 20px;
  background: var(--color-white);
}

.faq-compare__table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14px;
}

.faq-compare__table thead th {
  background: var(--color-blue);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 700;
  text-align: left;
  padding: 14px 16px;
  border-right: 1px solid rgba(255,255,255,.14);
}

.faq-compare__table thead th:last-child {
  border-right: none;
  color: var(--color-gold);
  background: #0d1f36;
}

.faq-compare__table tbody th {
  text-align: left;
  font-weight: 600;
  background: var(--faq-bg-soft);
  color: var(--color-black);
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-gray-mid);
  white-space: nowrap;
}

.faq-compare__table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-gray-mid);
  border-right: 1px solid var(--color-gray-mid);
  color: var(--color-gray-dark);
  line-height: 1.5;
}

.faq-compare__table tbody td:last-child {
  border-right: none;
  background: rgba(245,183,0,.05);
  color: var(--color-blue);
  font-weight: 500;
}

.faq-compare__table tbody tr:last-child th,
.faq-compare__table tbody tr:last-child td {
  border-bottom: none;
}

.faq-compare__table tbody tr:hover th,
.faq-compare__table tbody tr:hover td {
  background: rgba(10,37,64,.05);
}

.faq-compare__note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray-dark);
  background: var(--faq-bg-soft);
  padding: 14px 16px;
  border-left: 3px solid var(--color-gold);
}

.faq-compare__note p {
  margin: 0;
}

.faq-compare__note a {
  color: var(--color-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-gold);
  transition: text-decoration-color .2s ease;
}

.faq-compare__note a:hover,
.faq-compare__note a:focus-visible {
  text-decoration-color: var(--color-blue);
}

/* ---------- 底部联系区块 ---------- */
.faq-contact__box {
  background: var(--color-black);
  color: var(--color-white);
  padding: 28px 24px;
  display: grid;
  gap: 20px;
  align-items: center;
  border-left: 4px solid var(--color-gold);
}

.faq-contact__copy h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--color-white);
  letter-spacing: -.01em;
}

.faq-contact__copy p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(250,250,250,.78);
  margin: 0;
}

.faq-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.faq-contact__actions .btn {
  text-decoration: none;
  padding: 10px 18px;
  font-size: 14px;
}

/* ================== 媒体查询：平板 700px ================== */
@media (min-width: 700px) {

  .faq-hero {
    padding: 48px 0 64px;
  }

  .faq-hero__grid {
    grid-template-columns: 1.6fr 1fr;
    gap: 40px;
  }

  .faq-hero__copy h1 {
    font-size: 42px;
  }

  .faq-hero__side {
    margin-top: 8px;
    padding: 28px 24px;
  }

  .faq-hero__side-num {
    font-size: 56px;
  }

  .faq-layout {
    gap: 40px;
    padding-top: 48px;
  }

  .faq-list {
    grid-template-columns: 1fr;
  }

  .faq-step-card {
    grid-template-columns: 64px 1fr;
    gap: 18px;
    padding: 20px;
  }

  .faq-step-card__num {
    width: 60px;
    height: 60px;
    font-size: 34px;
  }

  .faq-contact__box {
    grid-template-columns: 1fr auto;
    gap: 24px;
    padding: 32px;
  }

}

/* ================== 媒体查询：桌面 960px ================== */
@media (min-width: 960px) {

  .faq-layout {
    grid-template-columns: 280px 1fr;
    gap: 48px;
    align-items: start;
    padding-top: 56px;
  }

  .faq-index__inner {
    position: sticky;
    top: calc(var(--header-height, 72px) + 32px);
  }

  .faq-section__head {
    display: grid;
    grid-template-columns: 120px 1fr;
    column-gap: 24px;
  }

  .faq-section__head .section-label {
    grid-column: 1;
    grid-row: 1 / span 2;
    margin-top: 8px;
  }

  .faq-section__head h2 {
    grid-column: 2;
    margin-top: 0;
  }

  .faq-section__head .faq-section__lead {
    grid-column: 2;
  }

  .faq-section__head {
    align-items: start;
  }

  .faq-compare__table {
    font-size: 15px;
  }

  .faq-compare__table thead th,
  .faq-compare__table tbody th,
  .faq-compare__table tbody td {
    padding: 16px 20px;
  }

}

/* ================== 大桌面 1200px ================== */
@media (min-width: 1200px) {

  .faq-hero__copy h1 {
    font-size: 48px;
  }

  .faq-hero__grid {
    gap: 64px;
  }

  .faq-layout {
    grid-template-columns: 300px 1fr;
    gap: 64px;
  }

  .faq-steps__list {
    grid-template-columns: 1fr;
  }

}