.page-faq {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: clamp(48px, 7vw, 96px);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-faq .tut-hero {
  position: relative;
  margin-top: clamp(16px, 2.5vw, 28px);
  padding: clamp(26px, 5vw, 58px) 0 clamp(22px, 3.6vw, 40px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}

.page-faq .tut-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--hairline-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(125% 95% at 10% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(125% 95% at 10% 0%, #000 0%, transparent 74%);
  pointer-events: none;
}

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

.page-faq .tut-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.2vw, 62px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0.32em 0 0;
  max-width: 17em;
  color: var(--ink-teal);
}

.page-faq .tut-hero__lede {
  margin: clamp(16px, 2.2vw, 22px) 0 0;
  max-width: 40em;
  font-size: clamp(15.5px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: var(--ink);
}

.page-faq .tut-hero__facts {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 15px 0 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-teal);
}

.page-faq .tut-hero__facts .mono {
  color: var(--copper);
  font-size: 14px;
}

/* ---------- 主体双栏 ---------- */
.page-faq .tut-shell {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 46px);
  align-items: start;
}

/* ---------- 左侧分类索引 ---------- */
.page-faq .tut-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-faq .tut-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--copper);
}

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

.page-faq .tut-index__item {
  flex: 0 0 auto;
}

.page-faq .tut-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--hairline);
  background: var(--white);
  color: var(--ink-teal);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-faq .tut-index__link:hover,
.page-faq .tut-index__link:focus-visible {
  background: var(--slate);
  border-color: var(--copper);
  outline: none;
}

.page-faq .tut-index__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--copper);
}

/* ---------- 章节块 ---------- */
.page-faq .tut-body {
  min-width: 0;
}

.page-faq .tut-block {
  padding: clamp(26px, 3.6vw, 46px) 0;
  border-top: 1px solid var(--hairline);
}

.page-faq .tut-body > .tut-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .tut-block__head {
  margin-bottom: 12px;
}

.page-faq .tut-block__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--copper);
  padding: 3px 8px;
  border: 1px solid var(--line);
  margin-bottom: 12px;
}

.page-faq .tut-block h2 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.3;
  margin: 0;
  color: var(--ink-teal);
}

.page-faq .tut-block__intro {
  margin: 12px 0 20px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 折叠问答 ---------- */
.page-faq .qa-list {
  display: grid;
  gap: 10px;
}

.page-faq .qa {
  background: var(--white);
  border: 1px solid var(--hairline);
  transition: border-color 0.2s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--copper-bright);
}

.page-faq .qa[open] {
  border-color: var(--line);
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink-teal);
}

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

.page-faq .qa__q::before {
  content: "?";
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--copper);
  margin-top: 2px;
}

.page-faq .qa__q::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--copper);
  transition: transform 0.2s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  content: "−";
}

.page-faq .qa__a {
  padding: 0 16px 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

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

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

/* ---------- 步骤与清单 ---------- */
.page-faq .steps {
  margin: 0 0 4px;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 10px;
}

.page-faq .steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 30px;
}

.page-faq .steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.08em;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--copper);
  border: 1px solid var(--line);
  padding: 1px 3px;
  line-height: 1.5;
}

.page-faq .tut-list {
  margin: 0 0 4px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .tut-list li {
  position: relative;
  padding-left: 16px;
}

.page-faq .tut-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 1px;
  background: var(--copper);
}

.page-faq .path {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  padding: 1px 6px;
  border: 1px solid var(--hairline);
  background: var(--slate);
  color: var(--ink-teal);
  white-space: nowrap;
}

.page-faq .tut-tip {
  margin: 14px 0 0;
  padding: 10px 14px;
  border-left: 3px solid var(--amber);
  background: rgba(242, 180, 90, 0.13);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 图示 ---------- */
.page-faq .tut-fig {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--slate);
}

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

.page-faq .tut-fig__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--ink-teal);
  opacity: 0.78;
}

/* ---------- 联系支持 ---------- */
.page-faq .tut-block--support {
  border-top: 0;
  padding-bottom: 0;
}

.page-faq .tut-support {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 4vw, 46px);
  background: var(--ink-teal);
  color: var(--paper);
  border: 1px solid var(--line);
}

.page-faq .tut-support::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(184, 131, 62, 0.42);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-faq .tut-support .eyebrow {
  color: var(--copper-bright);
  position: relative;
}

.page-faq .tut-support h2 {
  position: relative;
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.3;
  margin: 0.4em 0 12px;
  color: var(--white);
}

.page-faq .tut-support > p {
  position: relative;
  margin: 0 0 14px;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-faq .tut-list--support {
  position: relative;
  margin-bottom: 22px;
  color: var(--slate);
}

.page-faq .tut-list--support li::before {
  background: var(--copper-bright);
}

.page-faq .tut-support__grid {
  position: relative;
  margin: 0 0 22px;
  display: grid;
  gap: 1px;
  background: rgba(184, 131, 62, 0.3);
  border: 1px solid rgba(184, 131, 62, 0.3);
}

.page-faq .tut-support__cell {
  background: var(--ink-deep);
  padding: 15px 16px;
}

.page-faq .tut-support__key {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--copper-bright);
}

.page-faq .tut-support__val {
  display: block;
  font-size: 15px;
  line-height: 1.65;
  color: var(--white);
  word-break: break-word;
}

.page-faq .tut-support__note {
  position: relative;
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
  opacity: 0.86;
}

.page-faq .tut-support__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-faq .tut-support__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .qa__q {
    padding: 16px 20px;
    font-size: 16.5px;
  }

  .page-faq .qa__a {
    padding: 0 20px 20px;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 1024px) {
  .page-faq .tut-shell {
    grid-template-columns: minmax(190px, 232px) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-faq .tut-index {
    position: sticky;
    top: 24px;
  }

  .page-faq .tut-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .tut-index__item {
    flex: 1 1 auto;
  }

  .page-faq .tut-index__link {
    white-space: normal;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 9px 12px;
    font-size: 14.5px;
  }

  .page-faq .tut-index__link:hover,
  .page-faq .tut-index__link:focus-visible {
    background: rgba(184, 131, 62, 0.09);
    border-left-color: var(--copper);
    border-color: transparent;
    border-left-color: var(--copper);
  }
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 420px) {
  .page-faq .tut-hero__facts {
    gap: 8px 16px;
    font-size: 11.5px;
  }

  .page-faq .qa__q {
    font-size: 15px;
    padding: 13px 13px;
    gap: 9px;
  }

  .page-faq .qa__a {
    padding: 0 13px 16px;
    font-size: 15px;
  }

  .page-faq .steps > li {
    padding-left: 27px;
  }

  .page-faq .tut-support {
    padding: 20px 16px;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .qa__q::after,
  .page-faq .tut-index__link {
    transition: none;
  }
}

/* ---------- 打印 ---------- */
@media print {
  .page-faq .tut-index,
  .page-faq .tut-support__actions {
    display: none;
  }

  .page-faq .qa {
    border: 1px solid #999;
  }

  .page-faq .qa__a {
    display: block;
  }
}