/* ===== 使用教程页 page-faq ===== */
.page-faq {
  --faq-gap: clamp(30px, 5vw, 66px);
  --faq-shadow: 7px 7px 0 rgba(216, 205, 182, 0.1);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) 0 clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--line-strong);
  background:
    radial-gradient(130% 110% at 94% -12%, rgba(87, 240, 138, 0.14), transparent 58%),
    radial-gradient(95% 90% at 2% 112%, rgba(255, 106, 43, 0.1), transparent 62%),
    linear-gradient(180deg, var(--c-night) 0%, var(--c-ink) 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(216, 205, 182, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(216, 205, 182, 0.055) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-faq .faq-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-faq .faq-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(29px, 5.4vw, 54px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-faq .faq-hero__lead {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--c-white);
  opacity: 0.82;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 速览卡 */
.page-faq .faq-quick {
  position: relative;
  padding: 18px 20px 20px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(155deg, rgba(20, 38, 61, 0.95), rgba(5, 10, 18, 0.78));
}

.page-faq .faq-quick::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--c-orange);
}

.page-faq .faq-quick__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gray);
}

.page-faq .faq-quick__list {
  display: grid;
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-quick__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-faq .faq-quick__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .faq-quick__k {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-green);
}

.page-faq .faq-quick__v {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--c-gray);
}

/* ---------- 章节目录 ---------- */
.page-faq .faq-toc {
  position: sticky;
  top: var(--hdr-h);
  z-index: 15;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 10, 18, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-faq .faq-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-faq .faq-toc__list::-webkit-scrollbar {
  display: none;
}

.page-faq .faq-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  white-space: nowrap;
  font-size: 13.5px;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-faq .faq-toc__list .toc__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-orange);
}

.page-faq .faq-toc__list a:hover,
.page-faq .faq-toc__list a:focus-visible {
  color: var(--c-white);
  border-color: var(--line-strong);
}

.page-faq .faq-toc__list a.is-active {
  color: var(--c-green);
  border-color: rgba(87, 240, 138, 0.5);
  background: rgba(87, 240, 138, 0.08);
}

/* ---------- 步骤章节 ---------- */
.page-faq .faq-steps {
  padding-top: 6px;
}

.page-faq .tut-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: var(--faq-gap) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--hdr-h) + 76px);
}

.page-faq .tut-step:first-child {
  border-top-color: transparent;
}

.page-faq .tut-step__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5.5vw, 64px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--c-green);
}

.page-faq .tut-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.7vw, 31px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-faq .tut-step__lead {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-gray);
}

/* 步骤列表 */
.page-faq .tut-steps {
  counter-reset: tut;
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .tut-steps li {
  position: relative;
  counter-increment: tut;
  padding: 15px 18px 15px 58px;
  border: 1px solid var(--line);
  border-left: 2px solid rgba(255, 106, 43, 0.55);
  background: linear-gradient(115deg, rgba(20, 38, 61, 0.75), rgba(20, 38, 61, 0.32));
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-white);
}

.page-faq .tut-steps li::before {
  content: counter(tut, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-orange);
}

.page-faq .tut-steps strong {
  color: var(--c-green);
  font-weight: 600;
}

/* 图 */
.page-faq .tut-figure {
  margin: 26px 0 0;
}

.page-faq .tut-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  background: var(--c-stand);
  object-fit: cover;
}

.page-faq .tut-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-muted);
}

/* 字段纸卡 */
.page-faq .field-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

.page-faq .field-card {
  padding: 20px 20px 22px;
  background: var(--c-paper);
  border: 1px solid var(--c-paper-line);
  box-shadow: var(--faq-shadow);
  color: var(--c-ink-paper);
}

.page-faq .field-card__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-ink-paper);
}

.page-faq .field-card__note {
  margin: 0 0 15px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-forest);
}

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

.page-faq .field-list li {
  display: grid;
  grid-template-columns: 5.6em minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--c-paper-line);
  font-size: 14.5px;
  line-height: 1.65;
}

.page-faq .field-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-faq .field-list__k {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--c-forest);
}

/* 更新节奏时间线 */
.page-faq .update-line {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .update-line li {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--line-strong);
}

.page-faq .update-line li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-faq .update-line li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.16);
}

.page-faq .update-line__when {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.09em;
  color: var(--c-green);
}

.page-faq .update-line p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-white);
  opacity: 0.86;
}

/* 关注与摘要 */
.page-faq .follow-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-faq .follow-board__group {
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: rgba(20, 38, 61, 0.42);
}

.page-faq .follow-board__note {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-white);
  opacity: 0.86;
}

/* 移动端章节 */
.page-faq .mobile-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 26px;
}

.page-faq .tut-figure--tall {
  margin: 0;
  max-width: 340px;
}

.page-faq .note-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .note-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-white);
  opacity: 0.88;
}

.page-faq .note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--c-green);
}

/* ---------- 常见提问折叠 ---------- */
.page-faq .faq-more {
  padding: clamp(40px, 6vw, 76px) 0 0;
}

.page-faq .faq-more h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-faq .faq-fold {
  margin-top: 26px;
  border-top: 1px solid var(--line-strong);
}

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

.page-faq .faq-fold summary {
  position: relative;
  padding: 18px 42px 18px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(15.5px, 1.8vw, 18.5px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-white);
}

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

.page-faq .faq-fold summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--c-orange);
}

.page-faq .faq-fold details[open] summary::after {
  content: "–";
  color: var(--c-green);
}

.page-faq .faq-fold__body {
  max-width: 62ch;
  padding: 0 0 20px;
  font-size: 14.8px;
  line-height: 1.85;
  color: var(--c-gray);
}

.page-faq .faq-fold__body a {
  color: var(--c-green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收尾 ---------- */
.page-faq .faq-cta {
  padding: clamp(44px, 6vw, 80px) 0 clamp(56px, 8vw, 96px);
}

.page-faq .faq-cta__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 106, 43, 0.15), transparent 56%),
    linear-gradient(150deg, var(--c-stand), var(--c-night));
}

.page-faq .faq-cta__panel h2 {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-faq .faq-cta__panel p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-white);
  opacity: 0.82;
}

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

/* ---------- 动效 ---------- */
.page-faq [data-reveal].is-visible {
  animation: faq-lift 0.5s var(--ease) both;
}

@keyframes faq-lift {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-faq .field-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-faq .follow-board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-faq .mobile-split {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1fr);
    align-items: start;
    gap: 30px;
  }
}

@media (min-width: 880px) {
  .page-faq .tut-step {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: clamp(24px, 3.5vw, 52px);
  }

  .page-faq .tut-step__num {
    position: sticky;
    top: calc(var(--hdr-h) + 78px);
    align-self: start;
  }
}

@media (min-width: 940px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
  }

  .page-faq .faq-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (max-width: 560px) {
  .page-faq .field-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 3px;
  }

  .page-faq .faq-toc__list {
    gap: 6px;
  }

  .page-faq .faq-toc__list a {
    padding: 7px 11px;
    font-size: 13px;
  }

  .page-faq .tut-figure--tall {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal].is-visible {
    animation: none;
  }

  .page-faq .faq-toc__list a {
    transition: none;
  }
}