/* ===== 使用指南 · 页面专属样式（作用域 .page-faq） ===== */

.page-faq {
  --faq-num: 76px;
  --faq-pad: 20px;
  --faq-edge: rgba(37, 73, 110, 0.7);
}

.page-faq .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 48px) 0 44px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(255, 138, 31, 0.15) 0%, rgba(255, 138, 31, 0) 58%),
    linear-gradient(158deg, #0A1B2E 0%, #10263D 58%, #16324F 100%);
  border-bottom: 1px solid var(--faq-edge);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    102deg,
    rgba(37, 73, 110, 0.34) 0,
    rgba(37, 73, 110, 0.34) 1px,
    transparent 1px,
    transparent 58px
  );
  pointer-events: none;
}

.page-faq .faq-hero .shell {
  position: relative;
  z-index: 1;
}

.page-faq .page-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: 30px;
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-faq .page-hero__lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 问题分组导览 ---------- */

.page-faq .faq-index {
  display: grid;
  gap: 10px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num label"
    "num sub";
  align-items: center;
  gap: 2px 12px;
  padding: 14px 16px;
  background: rgba(16, 38, 61, 0.72);
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  text-decoration: none;
  color: var(--text);
  transition: background-color 0.24s ease, border-color 0.24s ease, transform 0.24s ease;
}

.page-faq .faq-index a:hover,
.page-faq .faq-index a:focus-visible {
  background: var(--panel-2);
  border-color: rgba(255, 138, 31, 0.6);
  transform: translateY(-2px);
}

.page-faq .faq-index a[aria-current="true"] {
  border-color: var(--accent);
  background: var(--panel-2);
}

.page-faq .faq-index__num {
  grid-area: num;
  align-self: center;
  font-size: 20px;
  font-weight: 700;
  color: rgba(255, 138, 31, 0.75);
  letter-spacing: 0.02em;
}

.page-faq .faq-index a[aria-current="true"] .faq-index__num {
  color: var(--accent);
}

.page-faq .faq-index__label {
  grid-area: label;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

.page-faq .faq-index__sub {
  grid-area: sub;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节区块 ---------- */

.page-faq .faq-block {
  padding: 46px 0 52px;
}

.page-faq .faq-block--last {
  padding-bottom: 40px;
}

.page-faq .faq-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-edge);
}

.page-faq .faq-block__head .index-num {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  flex: none;
}

.page-faq .faq-block__head h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.35;
  font-weight: 800;
  color: var(--text);
}

.page-faq .faq-block__lead {
  margin: 16px 0 0;
  max-width: 68ch;
  padding-left: 14px;
  border-left: 2px solid rgba(255, 138, 31, 0.5);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .slash-divider {
  height: 12px;
  margin: 0;
  background: repeating-linear-gradient(
    -78deg,
    rgba(255, 138, 31, 0.35) 0,
    rgba(255, 138, 31, 0.35) 2px,
    transparent 2px,
    transparent 14px
  );
  opacity: 0.7;
}

/* ---------- 内容分栏 ---------- */

.page-faq .faq-split {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.page-faq .faq-split .media-frame {
  order: -1;
}

/* ---------- 问答列表 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-faq .faq-list--tight {
  margin-top: 18px;
}

.page-faq .faq-item {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: background-color 0.24s ease, border-color 0.24s ease;
}

.page-faq .faq-item[open] {
  background: var(--panel-2);
  border-color: rgba(255, 138, 31, 0.55);
}

.page-faq .faq-item[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  z-index: 2;
}

.page-faq .faq-q {
  display: grid;
  grid-template-columns: var(--faq-num) 1fr 16px;
  align-items: start;
  gap: 0 14px;
  padding: 18px var(--faq-pad);
  cursor: pointer;
  list-style: none;
}

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

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

.page-faq .faq-q__num {
  padding-top: 3px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.page-faq .faq-q__text {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--text);
}

.page-faq .faq-q__mark {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
}

.page-faq .faq-q__mark::before,
.page-faq .faq-q__mark::after {
  content: "";
  position: absolute;
  background: var(--muted);
  transition: transform 0.24s ease, background-color 0.24s ease;
}

.page-faq .faq-q__mark::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-faq .faq-q__mark::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-q__mark::before {
  background: var(--accent);
}

.page-faq .faq-item[open] .faq-q__mark::after {
  transform: scaleY(0);
}

.page-faq .faq-a {
  padding: 0 var(--faq-pad) 20px calc(var(--faq-num) + 34px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

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

.page-faq .faq-a strong {
  color: var(--text);
  font-weight: 500;
}

.page-faq .faq-a a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 31, 0.45);
}

.page-faq .faq-a a:hover {
  border-bottom-color: var(--accent);
}

/* ---------- 图片容器 ---------- */

.page-faq .media-frame {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background: var(--deep);
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-faq .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-faq .ratio-3x2 {
  aspect-ratio: 3 / 2;
}

.page-faq .ratio-9x10 {
  aspect-ratio: 9 / 10;
}

.page-faq .media-frame__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  background: rgba(7, 19, 32, 0.88);
  border-top: 1px solid var(--faq-edge);
  border-right: 1px solid var(--faq-edge);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 三步操作路径 ---------- */

.page-faq .faq-steps {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.page-faq .faq-step {
  position: relative;
  padding: 22px 18px 34px;
  background: var(--panel);
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: background-color 0.24s ease, border-color 0.24s ease;
}

.page-faq .faq-step::after {
  content: attr(data-step-tip);
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 8px;
  padding: 7px 10px;
  background: var(--deep);
  border-left: 2px solid var(--accent);
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.22s ease, transform 0.22s ease;
  pointer-events: none;
}

.page-faq .faq-step:hover,
.page-faq .faq-step:focus-within {
  background: var(--panel-2);
  border-color: rgba(255, 138, 31, 0.5);
}

.page-faq .faq-step__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: rgba(255, 138, 31, 0.85);
  letter-spacing: 0.02em;
}

.page-faq .faq-step__title {
  margin: 10px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-faq .faq-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本对比表 ---------- */

.page-faq .faq-table-wrap {
  margin-top: 22px;
  overflow-x: auto;
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-faq .faq-compare {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-faq .faq-compare thead th {
  padding: 13px 16px;
  background: rgba(37, 73, 110, 0.5);
  border-bottom: 1px solid var(--faq-edge);
  text-align: left;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-faq .faq-compare tbody th {
  width: 26%;
  padding: 13px 16px;
  background: rgba(16, 38, 61, 0.66);
  border-bottom: 1px solid rgba(37, 73, 110, 0.45);
  text-align: left;
  font-weight: 500;
  color: var(--text);
}

.page-faq .faq-compare tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid rgba(37, 73, 110, 0.45);
  color: var(--muted);
}

.page-faq .faq-compare tbody tr:last-child th,
.page-faq .faq-compare tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-compare tbody td:first-of-type {
  color: var(--text);
}

/* ---------- 反馈通道卡片 ---------- */

.page-faq .faq-cards {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-faq .faq-card {
  padding: 22px 20px 18px;
  background: var(--panel);
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-faq .faq-card__tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(255, 138, 31, 0.14);
  border: 1px solid rgba(255, 138, 31, 0.45);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.page-faq .faq-card__title {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-faq .faq-card__text {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .faq-card__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(37, 73, 110, 0.7);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-card .contact-list {
  display: grid;
  gap: 8px;
  margin: 0;
}

.page-faq .faq-card .contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 10px 12px;
  background: rgba(7, 19, 32, 0.55);
  border-left: 2px solid var(--accent);
}

.page-faq .faq-card .contact-row__key {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-faq .faq-card .contact-row__value {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 14px;
  color: var(--text);
  word-break: break-all;
}

.page-faq .faq-card .copy-btn {
  flex: none;
  padding: 5px 12px;
  background: transparent;
  border: 1px solid var(--faq-edge);
  color: var(--muted);
  font-size: 12px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-faq .faq-card .copy-btn:hover,
.page-faq .faq-card .copy-btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-cta {
  margin-top: 34px;
  padding: 24px 20px;
  background: linear-gradient(120deg, rgba(22, 50, 79, 0.92) 0%, rgba(16, 38, 61, 0.92) 100%);
  border: 1px solid var(--faq-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-faq .faq-cta p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .page-hero__title {
    font-size: 38px;
  }

  .page-faq .page-hero__lead {
    font-size: 16px;
  }

  .page-faq .faq-block__head h2 {
    font-size: 26px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-index {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (min-width: 1000px) {
  .page-faq .faq-hero {
    padding-top: calc(var(--header-h) + 64px);
    padding-bottom: 58px;
  }

  .page-faq .faq-index {
    grid-template-columns: repeat(5, 1fr);
  }

  .page-faq .faq-split {
    grid-template-columns: 1.42fr 1fr;
    align-items: start;
    gap: 32px;
  }

  .page-faq .faq-split--reverse {
    grid-template-columns: 1fr 1.42fr;
  }

  .page-faq .faq-split--reverse .media-frame {
    order: 0;
  }

  .page-faq .faq-split--reverse .faq-list {
    order: 1;
  }

  .page-faq .faq-list--wide {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .page-faq .faq-block {
    padding: 60px 0 66px;
  }
}

@media (max-width: 640px) {
  .page-faq {
    --faq-num: 48px;
    --faq-pad: 14px;
  }

  .page-faq .faq-hero {
    padding-top: calc(var(--header-h) + 32px);
    padding-bottom: 34px;
  }

  .page-faq .page-hero__title {
    font-size: 26px;
  }

  .page-faq .faq-index__num {
    font-size: 17px;
  }

  .page-faq .faq-q {
    grid-template-columns: var(--faq-num) 1fr 14px;
    gap: 0 10px;
    padding: 16px var(--faq-pad);
  }

  .page-faq .faq-a {
    padding: 0 var(--faq-pad) 18px calc(var(--faq-num) + 24px);
    font-size: 14px;
  }

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

  .page-faq .faq-cta__actions .btn {
    width: 100%;
    text-align: center;
  }

  .page-faq .faq-compare {
    min-width: 460px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index a,
  .page-faq .faq-step,
  .page-faq .faq-item,
  .page-faq .faq-q__mark::before,
  .page-faq .faq-q__mark::after,
  .page-faq .faq-step::after {
    transition-duration: 0.01ms;
  }

  .page-faq .faq-index a:hover {
    transform: none;
  }
}