.page-faq {
  --faq-line: rgba(15, 31, 29, .12);
  --faq-gap: clamp(20px, 4vw, 40px);
  --faq-step-gap: 20px;
  background: linear-gradient(180deg, var(--ice) 0%, var(--frost) 42%, var(--ice) 100%);
  color: var(--text);
  font-family: var(--font-sans);
}

/* ---------- Hero ---------- */
.page-faq .faq-hero {
  position: relative;
  padding: clamp(104px, 15vw, 176px) 0 clamp(40px, 6vw, 72px);
}
.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(560px, 72vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(53, 224, 200, .28), transparent 66%);
  pointer-events: none;
}
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--indigo), transparent);
  opacity: .45;
}
.page-faq .faq-hero .container {
  position: relative;
  z-index: 1;
}
.page-faq .faq-hero__title {
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-size: clamp(34px, 6.4vw, 64px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-faq .faq-hero__lede {
  max-width: 60ch;
  margin-top: clamp(16px, 2.4vw, 24px);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: rgba(15, 31, 29, .82);
}
.page-faq .faq-hero__lede b {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
}
.page-faq .faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: clamp(22px, 3vw, 34px);
  font-size: 13px;
  color: var(--steel);
}
.page-faq .faq-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}
.page-faq .faq-hero__stat .num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 教程总览 ---------- */
.page-faq .faq-overview {
  padding: clamp(40px, 6vw, 72px) 0 clamp(24px, 3.6vw, 44px);
}
.page-faq .faq-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}
.page-faq .faq-sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-faq .faq-sec-head__sub {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(15, 31, 29, .75);
}

.page-faq .faq-series {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 1.6vw, 18px);
}
@media (min-width: 620px) {
  .page-faq .faq-series { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .page-faq .faq-series { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-faq .faq-series__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.2vw, 24px);
  text-decoration: none;
  color: var(--text);
  background: linear-gradient(160deg, rgba(244, 250, 252, .94), rgba(207, 231, 242, .72));
  border: 1px solid rgba(42, 92, 122, .24);
  clip-path: var(--cut-panel);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}
.page-faq .faq-series__card:hover,
.page-faq .faq-series__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--cyan);
}
.page-faq .faq-series__card:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}
.page-faq .faq-series__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}
.page-faq .faq-series__count small {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--steel);
}
.page-faq .faq-series__title {
  margin: 4px 0 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}
.page-faq .faq-series__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(15, 31, 29, .78);
}
.page-faq .faq-series__who {
  margin: auto 0 0;
  padding-top: 12px;
  font-size: 12px;
  color: var(--indigo);
  border-top: 1px dashed rgba(42, 92, 122, .32);
}

/* ---------- 目录 + 章节 ---------- */
.page-faq .faq-guide {
  padding: clamp(16px, 3vw, 32px) 0 clamp(48px, 7vw, 88px);
}
.page-faq .faq-guide__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
}
@media (min-width: 900px) {
  .page-faq .faq-guide__inner {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }
}

.page-faq .faq-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-faq .faq-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-faq .faq-toc__item { flex: 0 0 auto; }
.page-faq .faq-toc__link {
  display: block;
  padding: 9px 14px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  color: var(--ink);
  background: rgba(244, 250, 252, .74);
  border: 1px solid rgba(42, 92, 122, .26);
  clip-path: var(--cut-sm);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}
.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  border-color: var(--cyan);
  background: var(--frost);
}
.page-faq .faq-toc__link:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}
@media (min-width: 900px) {
  .page-faq .faq-toc { position: sticky; top: 118px; }
  .page-faq .faq-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-faq .faq-chapter {
  padding: 0 0 clamp(34px, 5vw, 52px) clamp(0px, 1.4vw, 20px);
  border-left: 3px solid transparent;
  scroll-margin-top: 128px;
  transition: border-color .3s var(--ease);
}
.page-faq .faq-chapter:target { border-left-color: var(--cyan); }
.page-faq .faq-chapter + .faq-chapter::before {
  content: "";
  display: block;
  width: 100%;
  height: 1px;
  margin-bottom: clamp(28px, 4vw, 44px);
  background: linear-gradient(90deg, var(--indigo), transparent);
  opacity: .32;
}
.page-faq .faq-chapter h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-faq .faq-chapter__lede {
  max-width: 58ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(15, 31, 29, .78);
}

/* ---------- 图片 ---------- */
.page-faq .faq-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--cut-panel);
  background: linear-gradient(150deg, var(--ice), var(--indigo));
}
.page-faq .faq-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 步骤 ---------- */
.page-faq .faq-steps {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--faq-step-gap);
}
.page-faq .faq-step {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 20px);
  align-items: start;
}
.page-faq .faq-step::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 48px;
  bottom: calc(-1 * var(--faq-step-gap));
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 200, .85), rgba(53, 224, 200, 0));
}
.page-faq .faq-step:last-child::before { display: none; }
.page-faq .faq-step__num {
  min-width: 42px;
  padding: 11px 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  color: var(--ink);
  background: linear-gradient(140deg, var(--cyan), #8df0e2);
  clip-path: var(--cut-sm);
}
.page-faq .faq-step__title {
  margin: 8px 0 0;
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}
.page-faq .faq-step__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(15, 31, 29, .82);
}

/* ---------- 折叠细节 ---------- */
.page-faq .faq-detail {
  margin-top: 12px;
  background: rgba(244, 250, 252, .72);
  border: 1px solid rgba(42, 92, 122, .22);
  clip-path: var(--cut-sm);
}
.page-faq .faq-detail summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--indigo);
  cursor: pointer;
  list-style: none;
}
.page-faq .faq-detail summary::-webkit-details-marker { display: none; }
.page-faq .faq-detail summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--orange);
}
.page-faq .faq-detail[open] summary::before { content: "–"; }
.page-faq .faq-detail summary:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--cyan);
}
.page-faq .faq-detail__body {
  padding: 0 14px 12px;
}
.page-faq .faq-detail__body p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(15, 31, 29, .8);
}
.page-faq .faq-detail__body p:last-child { margin-bottom: 0; }

/* ---------- 注释块 ---------- */
.page-faq .faq-tip {
  margin: 14px 0 0;
  padding: 12px 16px 12px 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
  background: var(--orange-soft);
  border-left: 3px solid var(--orange);
  clip-path: var(--cut-sm);
}
.page-faq .faq-tip b {
  font-weight: 800;
  color: var(--ink);
}

/* ---------- 图表读法 ---------- */
.page-faq .faq-chart-read {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 720px) {
  .page-faq .faq-chart-read { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-faq .faq-chart-read__item {
  position: relative;
  padding: 22px 18px 18px;
  background: rgba(244, 250, 252, .88);
}
.page-faq .faq-chart-read__item::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--indigo));
}
.page-faq .faq-chart-read__name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}
.page-faq .faq-chart-read__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(15, 31, 29, .78);
}

/* ---------- 正文内链行 ---------- */
.page-faq .faq-linkline {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(15, 31, 29, .76);
}
.page-faq .faq-linkline a {
  color: var(--indigo);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(42, 92, 122, .4);
}
.page-faq .faq-linkline a:hover,
.page-faq .faq-linkline a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--cyan);
}
.page-faq .faq-linkline a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 双语示意 ---------- */
.page-faq .faq-lang-pair {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
  padding: clamp(16px, 2.4vw, 22px);
  background: linear-gradient(120deg, var(--ink) 0%, var(--ink-2) 100%);
  clip-path: var(--cut-shell);
}
.page-faq .faq-lang-pair__side {
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--cyan);
  clip-path: var(--cut-sm);
}
.page-faq .faq-lang-pair__side--en {
  background: var(--orange);
}
.page-faq .faq-lang-pair__line {
  flex: 1 0 60px;
  height: 1px;
  background: repeating-linear-gradient(90deg, rgba(244, 250, 252, .6) 0 6px, transparent 6px 12px);
}

/* ---------- 偏好列表 ---------- */
.page-faq .faq-prefs {
  margin: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--faq-line);
}
.page-faq .faq-prefs__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--faq-line);
}
@media (min-width: 700px) {
  .page-faq .faq-prefs__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}
.page-faq .faq-prefs__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--indigo);
}
.page-faq .faq-prefs__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(15, 31, 29, .82);
}

/* ---------- 支持区块 ---------- */
.page-faq .faq-help {
  padding: 0 0 clamp(56px, 8vw, 104px);
}
.page-faq .faq-help__panel {
  padding: clamp(28px, 4.5vw, 56px);
  background: linear-gradient(135deg, var(--ink) 0%, var(--ink-2) 62%, #1b4f44 100%);
  clip-path: var(--cut-shell);
}
.page-faq .faq-help__panel .label { color: var(--cyan); }
.page-faq .faq-help__panel h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--frost);
}
.page-faq .faq-help__panel p {
  max-width: 56ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 250, 252, .82);
}
.page-faq .faq-help__contacts {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: rgba(244, 250, 252, .88);
}
.page-faq .faq-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}
.page-faq .faq-help__panel .btn--ghost {
  color: var(--frost);
  border-color: rgba(244, 250, 252, .5);
}
.page-faq .faq-help__panel .btn--ghost:hover,
.page-faq .faq-help__panel .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-faq .faq-step {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .page-faq .faq-step::before { display: none; }
  .page-faq .faq-step__num {
    min-width: 0;
    width: 54px;
  }
  .page-faq .faq-step__title { margin-top: 0; }
}