/* ===================== 使用教程页 · page-faq ===================== */

.page-faq {
  --faq-ink-soft: #3C4E55;
  --faq-ink-mute: #5C6E75;
  --faq-line: rgba(10, 26, 33, 0.12);
  --faq-line-soft: rgba(10, 26, 33, 0.08);
  --faq-paper-card: #FBF8F2;

  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

.page-faq *,
.page-faq *::before,
.page-faq *::after {
  box-sizing: border-box;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

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

/* ---------- 首屏：米白阅读区 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 34px) 0 clamp(40px, 8vw, 82px);
  background: linear-gradient(180deg, var(--paper) 0%, #EAE4D6 100%);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(10, 26, 33, 0.05) 0 1px,
    transparent 1px 15px
  );
  pointer-events: none;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(46vw, 400px);
  height: 100%;
  background: var(--cyan);
  opacity: 0.09;
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

/* 面包屑 */

.page-faq .breadcrumb {
  margin-bottom: clamp(18px, 3.5vw, 28px);
}

.page-faq .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.page-faq .breadcrumb-item {
  display: flex;
  align-items: center;
}

.page-faq .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--mist);
}

.page-faq .breadcrumb-link {
  color: var(--faq-ink-mute);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-faq .breadcrumb-link:hover {
  color: var(--clay);
}

.page-faq .breadcrumb-current {
  color: var(--ink);
}

/* 标题建筑 */

.page-faq .faq-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--clay);
}

.page-faq .faq-title {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 8vw, 3.6rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-faq .faq-lede {
  margin: clamp(18px, 3.5vw, 28px) 0 0;
  max-width: 48ch;
  font-size: clamp(1rem, 2.6vw, 1.0625rem);
  line-height: 1.95;
  color: var(--faq-ink-soft);
}

.page-faq .faq-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--faq-ink-mute);
}

.page-faq .faq-hero-meta li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.page-faq .faq-hero-meta li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--gold);
  transform: rotate(45deg);
}

/* ---------- 主体：索引 + 内容流 ---------- */

.page-faq .faq-body {
  background: var(--paper);
  padding: clamp(36px, 7vw, 72px) 0 clamp(56px, 10vw, 108px);
}

/* 步骤索引：移动端横向滚动 */

.page-faq .faq-index {
  margin-bottom: clamp(32px, 6vw, 44px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-faq .faq-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-faq .faq-index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--faq-line);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  background: rgba(255, 255, 255, 0.55);
  color: var(--faq-ink-soft);
  font-size: 0.875rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-faq .faq-index-link:hover,
.page-faq .faq-index-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(47, 214, 196, 0.12);
  color: var(--ink);
}

.page-faq .faq-index-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clay);
  letter-spacing: 0.04em;
}

/* ---------- 章节 ---------- */

.page-faq .faq-sec {
  padding: clamp(30px, 6vw, 54px) 0;
  border-top: 1px solid var(--faq-line);
}

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

.page-faq .faq-sec-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 3vw, 22px);
  margin-bottom: clamp(16px, 3vw, 24px);
}

.page-faq .faq-sec-num {
  flex: none;
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 8vw, 3.2rem);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: -0.04em;
  color: rgba(201, 162, 39, 0.18);
  -webkit-text-stroke: 1px rgba(201, 162, 39, 0.9);
}

.page-faq .faq-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.6vw, 1.9rem);
  line-height: 1.36;
  color: var(--ink);
}

.page-faq .faq-sec-lede {
  margin: 0 0 clamp(20px, 4vw, 30px);
  max-width: 62ch;
  color: var(--faq-ink-soft);
}

.page-faq .faq-subtitle {
  margin: clamp(24px, 4vw, 34px) 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--clay);
}

.page-faq .faq-link {
  color: var(--clay);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.25s var(--ease);
}

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

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 0 0 clamp(22px, 4vw, 30px);
  background: var(--ink);
  border: 1px solid rgba(10, 26, 33, 0.18);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  overflow: hidden;
}

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

.page-faq .faq-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-faq .faq-figure--info img {
  aspect-ratio: 4 / 3;
}

.page-faq .faq-figure figcaption {
  padding: 10px 14px;
  background: var(--paper);
  border-top: 1px solid var(--faq-line-soft);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--faq-ink-mute);
}

/* ---------- 四步操作 ---------- */

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

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-step:first-child {
  border-top: 0;
  padding-top: 2px;
}

.page-faq .faq-step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--ink);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.page-faq .faq-step-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-faq .faq-step-text {
  margin: 0;
  max-width: 60ch;
  color: var(--faq-ink-soft);
}

.page-faq .faq-step-where {
  display: inline-block;
  margin-top: 9px;
  padding: 3px 9px;
  background: rgba(193, 80, 46, 0.1);
  border-left: 2px solid var(--clay);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--clay);
}

/* ---------- 资料下载：分栏 ---------- */

.page-faq .faq-doclist {
  margin: 0 0 clamp(20px, 4vw, 28px);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-doc {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--faq-line-soft);
}

.page-faq .faq-doc-num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-faq .faq-doc-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-faq .faq-doc-text {
  margin: 4px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--faq-ink-soft);
}

.page-faq .faq-note {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--faq-ink-soft);
}

.page-faq .faq-note--alert {
  padding: 12px 14px;
  background: rgba(201, 162, 39, 0.14);
  border-left: 3px solid var(--gold);
  color: #4A3B12;
}

/* ---------- 清单：六大类 ---------- */

.page-faq .faq-cats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0 0 clamp(22px, 4vw, 30px);
  padding: 0;
  list-style: none;
}

.page-faq .faq-cat {
  padding: 16px 16px 18px;
  background: var(--faq-paper-card);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--night);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-faq .faq-cat-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
  margin-bottom: 7px;
}

.page-faq .faq-cat-name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-faq .faq-cat-count {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-faq .faq-cat-text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--faq-ink-soft);
}

/* 状态标记说明 */

.page-faq .faq-legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0 0 clamp(20px, 4vw, 28px);
  padding: 0;
  list-style: none;
}

.page-faq .faq-legend li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--faq-ink-soft);
}

.page-faq .faq-legend .badge {
  flex: none;
}

/* ---------- 测试版内容栏目：窄步骤 ---------- */

.page-faq .faq-narrow {
  margin: 0 0 clamp(18px, 3.5vw, 26px);
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-faq .faq-narrow-item {
  padding: 16px 0 16px 16px;
  border-left: 2px solid rgba(47, 214, 196, 0.45);
  border-top: 1px solid var(--faq-line-soft);
}

.page-faq .faq-narrow-item:first-child {
  border-top: 0;
}

.page-faq .faq-narrow-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-faq .faq-narrow-item:first-child .faq-narrow-title {
  color: var(--clay);
}

.page-faq .faq-narrow-text {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--faq-ink-soft);
}

/* ---------- 折叠问答 ---------- */

.page-faq .faq-accordion {
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-item {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-item[open] {
  background: rgba(16, 27, 51, 0.035);
}

.page-faq .faq-item-q {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 12px;
  padding: 17px 12px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  transition: color 0.25s var(--ease);
}

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

.page-faq .faq-item-q:hover {
  color: var(--clay);
}

.page-faq .faq-item-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-faq .faq-item-icon {
  position: relative;
  justify-self: end;
  width: 18px;
  height: 18px;
}

.page-faq .faq-item-icon::before,
.page-faq .faq-item-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--clay);
  transform: translate(-50%, -50%);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-faq .faq-item-icon::before {
  width: 14px;
  height: 2px;
}

.page-faq .faq-item-icon::after {
  width: 2px;
  height: 14px;
}

.page-faq .faq-item[open] .faq-item-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-item-a {
  padding: 0 14px 20px 56px;
}

.page-faq .faq-item-a p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--faq-ink-soft);
}

/* ---------- 客服色块 ---------- */

.page-faq .faq-sec--help {
  padding-bottom: 0;
}

.page-faq .faq-help {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5.5vw, 48px);
  background: var(--ink);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 0 100%);
}

.page-faq .faq-help::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -46%;
  width: 52%;
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle, rgba(47, 214, 196, 0.18) 0%, transparent 68%);
  pointer-events: none;
}

.page-faq .faq-help::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--gold) 52%, var(--clay) 100%);
}

.page-faq .faq-help-inner {
  position: relative;
  z-index: 1;
}

.page-faq .faq-help-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 4.4vw, 1.75rem);
  line-height: 1.4;
  color: var(--paper);
}

.page-faq .faq-help-text {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: #AEBEC3;
}

.page-faq .faq-help-text .faq-link {
  color: var(--gold-light);
}

.page-faq .faq-help-text .faq-link:hover {
  color: var(--paper);
}

.page-faq .faq-contact {
  display: grid;
  gap: 0;
  margin: clamp(18px, 3.5vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-contact li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px solid rgba(138, 154, 160, 0.24);
}

.page-faq .faq-contact-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-faq .faq-contact-val {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--paper);
  word-break: break-word;
}

/* ===================== 响应式 ===================== */

@media (min-width: 700px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-faq .faq-legend li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-split {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    gap: clamp(28px, 5vw, 56px);
    align-items: start;
  }

  .page-faq .faq-split-side {
    margin-bottom: 0;
    position: sticky;
    top: 96px;
  }

  .page-faq .faq-help-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(28px, 5vw, 60px);
    align-items: start;
  }

  .page-faq .faq-contact {
    margin-top: 0;
  }

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

@media (min-width: 960px) {
  .page-faq .faq-body-inner {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 78px);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-faq .faq-index-list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-index-list li {
    margin-bottom: 2px;
  }

  .page-faq .faq-index-link {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 10px;
    padding: 12px 10px;
    border: 0;
    border-left: 1px solid var(--faq-line);
    background: transparent;
    clip-path: none;
    font-size: 0.9375rem;
    line-height: 1.55;
    white-space: normal;
  }

  .page-faq .faq-index-link:hover,
  .page-faq .faq-index-link:focus-visible {
    border-left-color: var(--gold);
    background: rgba(201, 162, 39, 0.1);
    color: var(--ink);
  }

  .page-faq .faq-index-text {
    display: block;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-sec-num {
    padding-top: 2px;
  }
}

@media (max-width: 420px) {
  .page-faq .faq-item-q {
    grid-template-columns: 26px minmax(0, 1fr) 18px;
    gap: 8px;
    font-size: 1rem;
  }

  .page-faq .faq-item-a {
    padding-left: 40px;
  }

  .page-faq .faq-doc,
  .page-faq .faq-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }

  .page-faq .faq-contact li {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index-link,
  .page-faq .faq-item-q,
  .page-faq .faq-item-icon::before,
  .page-faq .faq-item-icon::after,
  .page-faq .faq-link,
  .page-faq .breadcrumb-link {
    transition: none;
  }
}