/* ========== 帮助中心页面 ========== */
.page-faq {
  --faq-navy: #0A1E3F;
  --faq-dark: #071428;
  --faq-gold: #D4AF37;
  --faq-orange: #FF6B2C;
  --faq-green: #39FF14;
  --faq-cream: #F5F2ED;
  --faq-ink: #1A1A1A;
  --faq-muted: #5B6B7B;
  --faq-line: #E0D8C8;
  background: var(--faq-cream);
  color: var(--faq-ink);
  font-family: 'Noto Serif SC', serif;
  line-height: 1.6;
}

.page-faq .container {
  width: 100%;
  max-width: 1220px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* 面包屑 */
.page-faq .breadcrumb {
  padding-block: 1.75rem 1.25rem;
}

.page-faq .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .88rem;
}

.page-faq .breadcrumb__link {
  color: var(--faq-muted);
  text-decoration: none;
}

.page-faq .breadcrumb__link:hover {
  color: var(--faq-navy);
}

.page-faq .breadcrumb__current {
  color: var(--faq-navy);
  font-weight: 600;
}

/* Hero */
.page-faq__hero {
  position: relative;
  margin-bottom: 3rem;
  padding-block: 2.5rem 4.5rem;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(circle at 80% 20%, rgba(212, 175, 55, .2), transparent 40%),
    linear-gradient(135deg, var(--faq-navy) 0%, var(--faq-dark) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2.5rem), 0 100%);
}

.page-faq__hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 40%;
  width: 7rem;
  height: .45rem;
  background: var(--faq-orange);
  opacity: .9;
  transform: skewX(-32deg);
}

.page-faq__hero-grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-faq__hero-copy {
  position: relative;
  z-index: 1;
}

.page-faq__kicker {
  display: inline-flex;
  align-items: center;
  margin-bottom: .9rem;
  padding: .35rem .8rem;
  color: var(--faq-gold);
  border: 1px solid rgba(212, 175, 55, .5);
  background: rgba(212, 175, 55, .12);
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .78rem;
  letter-spacing: .12em;
  line-height: 1.4;
  text-transform: uppercase;
  clip-path: polygon(.6rem 0, 100% 0, calc(100% - .6rem) 100%, 0 100%);
}

.page-faq__hero-title {
  margin: 0 0 .9rem;
  color: #fff;
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -.02em;
}

.page-faq__hero-lead {
  max-width: 38em;
  margin: 0 0 1.5rem;
  color: rgba(255, 255, 255, .82);
  font-size: 1.02rem;
  line-height: 1.8;
}

.page-faq__stats {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

.page-faq__stat {
  min-width: 8rem;
  padding: .7rem .9rem .7rem .8rem;
  background: rgba(255, 255, 255, .06);
  border-left: 3px solid var(--faq-gold);
}

.page-faq__stat-num {
  display: block;
  color: var(--faq-gold);
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.5rem;
  line-height: 1.2;
}

.page-faq__stat-label {
  display: block;
  margin-top: .2rem;
  color: rgba(255, 255, 255, .72);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .8rem;
}

.page-faq__hero-visual {
  position: relative;
  max-width: 24rem;
  margin-inline: auto;
}

.page-faq__hero-visual::before {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 1rem -1rem -1rem 1rem;
  background: linear-gradient(135deg, var(--faq-orange), var(--faq-gold));
  opacity: .35;
  clip-path: polygon(1.5rem 0, 100% 0, calc(100% - 1.5rem) 100%, 0 100%);
}

.page-faq__hero-img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(1rem 0, 100% 0, calc(100% - 1rem) 100%, 0 100%);
}

/* FAQ section */
.page-faq__section {
  padding-bottom: 3.5rem;
}

.page-faq__head {
  margin-bottom: 1.4rem;
}

.page-faq__kicker--navy {
  color: var(--faq-navy);
  border-color: rgba(10, 30, 63, .25);
  background: rgba(10, 30, 63, .06);
}

.page-faq__sec-title {
  margin: 0 0 .5rem;
  color: var(--faq-navy);
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1.8rem;
  line-height: 1.25;
  letter-spacing: -.01em;
}

.page-faq__sec-desc {
  max-width: 48em;
  margin: 0;
  color: var(--faq-muted);
  line-height: 1.8;
}

/* filters */
.page-faq__filters {
  display: flex;
  gap: .45rem;
  margin-bottom: 1.4rem;
  padding: .2rem .2rem .6rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-faq__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-faq__filter-btn {
  flex: 0 0 auto;
  padding: .5rem 1rem;
  color: var(--faq-navy);
  border: 1px solid var(--faq-line);
  background: #fff;
  cursor: pointer;
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .85rem;
  font-weight: 600;
  clip-path: polygon(.65rem 0, 100% 0, calc(100% - .65rem) 100%, 0 100%);
  transition: background .15s ease, color .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.page-faq__filter-btn:hover {
  border-color: var(--faq-gold);
}

.page-faq__radio:checked + .page-faq__filter-btn {
  color: #fff;
  background: var(--faq-navy);
  border-color: var(--faq-navy);
  box-shadow: 0 .25rem .6rem rgba(10, 30, 63, .18);
}

.page-faq__radio:focus-visible + .page-faq__filter-btn {
  outline: 2px solid var(--faq-orange);
  outline-offset: 2px;
}

/* grid */
.page-faq__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* index */
.page-faq__index {
  display: none;
  position: sticky;
  top: 1.5rem;
  padding: 1.3rem 1.2rem 1rem;
  color: #fff;
  background: var(--faq-navy);
  clip-path: polygon(1rem 0, 100% 0, calc(100% - 1rem) 100%, 0 100%);
}

.page-faq__index-title {
  margin: 0 0 .8rem;
  color: var(--faq-gold);
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: 1rem;
  letter-spacing: .06em;
}

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

.page-faq__index-list li {
  margin-bottom: .25rem;
}

.page-faq__index-link {
  display: flex;
  gap: .5rem;
  align-items: baseline;
  padding: .55rem .6rem;
  color: rgba(255, 255, 255, .82);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .88rem;
  line-height: 1.4;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}

.page-faq__index-link:hover,
.page-faq__index-link:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, .08);
  border-left-color: var(--faq-gold);
  outline: none;
}

.page-faq__index-no {
  flex: 0 0 auto;
  color: var(--faq-green);
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .72rem;
  transform: translateY(.05em);
}

/* panels */
.page-faq__panels {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}

.page-faq__item {
  display: block;
  border: 1px solid var(--faq-line);
  border-left: 5px solid var(--faq-line);
  background: #fff;
  clip-path: polygon(.9rem 0, 100% 0, calc(100% - .9rem) 100%, 0 100%);
  transition: box-shadow .2s ease, border-color .2s ease;
}

.page-faq__item[open] {
  border-left-color: var(--faq-gold);
  box-shadow: 0 .45rem 1.2rem rgba(10, 30, 63, .08);
}

.page-faq__q {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: 1rem 1.1rem;
  color: var(--faq-navy);
  font-family: 'Noto Sans SC', sans-serif;
  cursor: pointer;
  list-style: none;
}

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

.page-faq__q-cat {
  flex: 0 0 auto;
  padding: .2rem .5rem;
  color: var(--faq-muted);
  border: 1px solid var(--faq-line);
  background: var(--faq-cream);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .05em;
}

.page-faq__item[data-cat="subscribe"] .page-faq__q-cat {
  color: var(--faq-navy);
  border-color: rgba(10, 30, 63, .3);
}

.page-faq__item[data-cat="video"] .page-faq__q-cat {
  color: #A85A00;
  border-color: rgba(255, 107, 44, .35);
}

.page-faq__item[data-cat="version"] .page-faq__q-cat {
  color: #8A6D00;
  border-color: rgba(212, 175, 55, .55);
  background: rgba(212, 175, 55, .08);
}

.page-faq__item[data-cat="support"] .page-faq__q-cat {
  color: #0B6E4F;
  border-color: rgba(57, 255, 20, .35);
  background: rgba(57, 255, 20, .05);
}

.page-faq__item[data-cat="account"] .page-faq__q-cat {
  color: var(--faq-navy);
  border-color: rgba(10, 30, 63, .25);
}

.page-faq__q-text {
  flex: 1 1 auto;
  font-weight: 600;
  line-height: 1.45;
}

.page-faq__q-icon {
  position: relative;
  flex: 0 0 auto;
  width: 1.2rem;
  height: 1.2rem;
  border: 1px solid var(--faq-navy);
  border-radius: 50%;
}

.page-faq__q-icon::before,
.page-faq__q-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: .55rem;
  height: 2px;
  background: var(--faq-navy);
  transform: translate(-50%, -50%);
}

.page-faq__q-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-faq__item[open] .page-faq__q-icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-faq__q:focus-visible {
  outline: 2px solid var(--faq-orange);
  outline-offset: -4px;
}

.page-faq__a {
  padding: 0 1.1rem 1.1rem;
  border-top: 1px dashed var(--faq-line);
  margin-top: .4rem;
}

.page-faq__a > *:first-child {
  margin-top: 1rem;
}

.page-faq__a p {
  margin: 1rem 0 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--faq-ink);
}

.page-faq__a a {
  color: var(--faq-navy);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq__a a:hover {
  color: var(--faq-orange);
}

/* :has() 分类过滤 */
.page-faq__acc:has(#faq-filter-account:checked) :is(.page-faq__panels > details, .page-faq__index-list > li) { display: none; }
.page-faq__acc:has(#faq-filter-account:checked) :is(.page-faq__panels > details[data-cat="account"], .page-faq__index-list > li[data-cat="account"]) { display: block; }

.page-faq__acc:has(#faq-filter-subscribe:checked) :is(.page-faq__panels > details, .page-faq__index-list > li) { display: none; }
.page-faq__acc:has(#faq-filter-subscribe:checked) :is(.page-faq__panels > details[data-cat="subscribe"], .page-faq__index-list > li[data-cat="subscribe"]) { display: block; }

.page-faq__acc:has(#faq-filter-video:checked) :is(.page-faq__panels > details, .page-faq__index-list > li) { display: none; }
.page-faq__acc:has(#faq-filter-video:checked) :is(.page-faq__panels > details[data-cat="video"], .page-faq__index-list > li[data-cat="video"]) { display: block; }

.page-faq__acc:has(#faq-filter-version:checked) :is(.page-faq__panels > details, .page-faq__index-list > li) { display: none; }
.page-faq__acc:has(#faq-filter-version:checked) :is(.page-faq__panels > details[data-cat="version"], .page-faq__index-list > li[data-cat="version"]) { display: block; }

.page-faq__acc:has(#faq-filter-support:checked) :is(.page-faq__panels > details, .page-faq__index-list > li) { display: none; }
.page-faq__acc:has(#faq-filter-support:checked) :is(.page-faq__panels > details[data-cat="support"], .page-faq__index-list > li[data-cat="support"]) { display: block; }

/* version */
.page-faq__version {
  position: relative;
  margin-top: 1rem;
  padding-block: 3.5rem 4rem;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(135deg, var(--faq-dark), var(--faq-navy));
}

.page-faq__version::before {
  content: "";
  position: absolute;
  top: -3rem;
  right: -2rem;
  width: 12rem;
  height: 12rem;
  border: 1px solid rgba(212, 175, 55, .5);
  transform: rotate(12deg);
}

.page-faq__version .page-faq__sec-title {
  color: #fff;
}

.page-faq__version .page-faq__sec-desc {
  color: rgba(255, 255, 255, .78);
}

.page-faq__version-card {
  display: grid;
  gap: 2rem;
  margin-top: 1.8rem;
  align-items: center;
}

.page-faq__version-copy {
  overflow-x: auto;
}

.page-faq__table {
  width: 100%;
  min-width: 30rem;
  border-collapse: collapse;
  background: rgba(255, 255, 255, .05);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .9rem;
}

.page-faq__table th,
.page-faq__table td {
  padding: .75rem .8rem;
  border: 1px solid rgba(255, 255, 255, .16);
  text-align: left;
  vertical-align: top;
}

.page-faq__table thead th {
  color: var(--faq-gold);
  background: rgba(212, 175, 55, .18);
  font-family: 'Archivo Black', 'Noto Sans SC', sans-serif;
  font-size: .8rem;
  letter-spacing: .05em;
}

.page-faq__table tbody th {
  width: 22%;
  color: #fff;
  background: rgba(10, 30, 63, .6);
  font-weight: 600;
}

.page-faq__table tbody td {
  color: rgba(255, 255, 255, .85);
}

.page-faq__table tbody tr:last-child th,
.page-faq__table tbody tr:last-child td {
  border-bottom-color: rgba(57, 255, 20, .45);
}

.page-faq__table tbody tr:last-child td {
  box-shadow: inset 0 -2px 0 rgba(57, 255, 20, .3);
}

.page-faq__version-note {
  margin: 1rem 0 0;
  color: rgba(255, 255, 255, .72);
  font-size: .88rem;
  line-height: 1.7;
}

.page-faq__version-note a {
  color: var(--faq-gold);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq__version-visual {
  margin: 0;
}

.page-faq__version-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, .22);
  clip-path: polygon(1rem 0, 100% 0, calc(100% - 1rem) 100%, 0 100%);
}

.page-faq__version-cap {
  margin-top: .55rem;
  color: rgba(255, 255, 255, .6);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .8rem;
  text-align: right;
}

/* support */
.page-faq__support {
  padding-block: 3.5rem 3rem;
  background: var(--faq-cream);
}

.page-faq__support-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

.page-faq__support-card {
  padding: 1.2rem 1.3rem;
  background: #fff;
  border-left: 4px solid var(--faq-gold);
  box-shadow: 0 .3rem .9rem rgba(10, 30, 63, .06);
  clip-path: polygon(.8rem 0, 100% 0, calc(100% - .8rem) 100%, 0 100%);
}

.page-faq__support-card:nth-child(2) {
  border-left-color: var(--faq-orange);
}

.page-faq__support-card:nth-child(3) {
  border-left-color: var(--faq-green);
}

.page-faq__support-label {
  margin: 0 0 .35rem;
  color: var(--faq-muted);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.page-faq__support-value {
  margin: 0 0 .35rem;
  color: var(--faq-navy);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 1.02rem;
  font-weight: 700;
  word-break: break-word;
}

.page-faq__support-description {
  margin: 0;
  color: var(--faq-muted);
  font-size: .88rem;
  line-height: 1.7;
}

.page-faq__support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  align-items: center;
  margin-top: 1.6rem;
}

.page-faq__support-btn {
  display: inline-block;
  padding: .7rem 1.4rem;
  color: var(--faq-navy);
  background: var(--faq-orange);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .9rem;
  font-weight: 700;
  text-decoration: none;
  clip-path: polygon(.7rem 0, 100% 0, calc(100% - .7rem) 100%, 0 100%);
  transition: filter .15s ease, transform .15s ease;
}

.page-faq__support-btn:hover {
  filter: brightness(.94);
  transform: translateY(-1px);
}

.page-faq__support-link {
  color: var(--faq-navy);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: .88rem;
  font-weight: 600;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-faq__support-link:hover {
  color: var(--faq-orange);
}

/* 桌面增强 */
@media (min-width: 760px) {
  .page-faq__support-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq__hero-grid {
    grid-template-columns: 1.1fr .9fr;
  }
}

@media (min-width: 900px) {
  .page-faq__grid {
    grid-template-columns: minmax(15rem, 17rem) 1fr;
  }

  .page-faq__index {
    display: block;
  }
}

@media (min-width: 1040px) {
  .page-faq__version-card {
    grid-template-columns: 1.1fr .9fr;
  }
}