/* ===== 使用教程页 · page-faq ===== */

.page-faq {
  --faq-step-col: 44px;
}

/* --- 首屏 --- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 7vw, 88px) clamp(32px, 5vw, 64px);
  background-image: linear-gradient(112deg, var(--c-green-pale) 0%, var(--c-green-pale) 54%, var(--c-paper) 54%);
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -30%;
  width: min(430px, 48vw);
  height: 170%;
  background: var(--c-ink);
  opacity: .05;
  transform: rotate(9deg);
  pointer-events: none;
}

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

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.78;
  color: var(--c-muted);
}

.page-faq .faq-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-hero__fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 4px;
}

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1;
  color: var(--c-green-deep);
  letter-spacing: -0.03em;
}

.page-faq .faq-hero__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-orange);
}

.page-faq .faq-hero__caption {
  flex-basis: 100%;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* --- 目录 + 内容双栏骨架 --- */
.page-faq .faq-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
  padding-block: clamp(28px, 5vw, 56px);
}

.page-faq .faq-toc {
  padding-bottom: 4px;
}

.page-faq .faq-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-muted);
}

.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: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  background: var(--c-paper);
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}

.page-faq .faq-toc__link:hover,
.page-faq .faq-toc__link:focus-visible {
  border-color: var(--c-green);
  color: var(--c-green-deep);
  background: var(--c-green-pale);
}

.page-faq .faq-toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-orange);
}

/* --- 内容块节奏 --- */
.page-faq .faq-block + .faq-block {
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-block__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-faq .faq-block__lede {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-muted);
}

.page-faq .faq-text {
  margin: 20px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-faq .faq-inline-link {
  color: var(--c-green-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--c-green);
  padding-bottom: 1px;
  transition: color .18s ease, border-color .18s ease;
}

.page-faq .faq-inline-link:hover,
.page-faq .faq-inline-link:focus-visible {
  color: var(--c-orange);
  border-color: var(--c-orange);
}

.page-faq .faq-callout {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--c-orange);
  background: var(--c-sand);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-ink);
}

/* --- 分栏 --- */
.page-faq .faq-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 32px);
  align-items: start;
}

/* --- 六步清单 --- */
.page-faq .faq-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: var(--faq-step-col) minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
  transition: border-color .18s ease, box-shadow .18s ease;
}

.page-faq .faq-step:hover {
  border-color: var(--c-green);
  box-shadow: var(--shadow-soft);
}

.page-faq .faq-step__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.15;
  color: var(--c-green);
  letter-spacing: -0.02em;
}

.page-faq .faq-step__title {
  margin: 0 0 5px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-faq .faq-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-muted);
}

/* --- 图 --- */
.page-faq .faq-figure {
  margin: 0;
  padding: 10px;
  background: var(--c-sand);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: calc(var(--radius-card) - 6px);
}

.page-faq .faq-figure::after {
  content: "";
  display: block;
  height: 3px;
  margin-top: 10px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-green) 0 34%, var(--c-cyan) 34% 67%, var(--c-orange) 67% 100%);
}

/* --- 三档卡片 --- */
.page-faq .faq-tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-tier {
  padding: 20px 18px;
  background: var(--c-sand);
  border-radius: var(--radius-card);
  border-top: 3px solid var(--c-green);
}

.page-faq .faq-tier__name {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--c-green-deep);
}

.page-faq .faq-tier__q {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-ink);
}

.page-faq .faq-tier__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-faq .faq-legend {
  margin-top: 20px;
  flex-wrap: wrap;
  gap: 10px 22px;
}

/* --- 三类场景 --- */
.page-faq .faq-scenes {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-scene {
  padding-left: 16px;
  border-left: 1px solid var(--c-line);
  transition: border-color .18s ease;
}

.page-faq .faq-scene:hover {
  border-left-color: var(--c-cyan);
}

.page-faq .faq-scene__title {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-faq .faq-scene__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--c-muted);
}

/* --- 补时备注深色面板 --- */
.page-faq .faq-note-panel {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--c-ink);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.page-faq .faq-note-panel__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--c-cyan);
}

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

.page-faq .faq-note-panel__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-green-pale);
}

.page-faq .faq-note-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-orange);
}

/* --- 折叠问答 --- */
.page-faq .faq-qa {
  margin-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--c-line);
}

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

.page-faq .faq-q__ask {
  position: relative;
  padding: 18px 46px 18px 0;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--c-ink);
  cursor: pointer;
  list-style: none;
  transition: color .18s ease;
}

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

.page-faq .faq-q__ask::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--c-muted);
  transition: color .18s ease, transform .18s ease;
}

.page-faq .faq-q__ask:hover {
  color: var(--c-green-deep);
}

.page-faq .faq-q[open] .faq-q__ask {
  color: var(--c-green-deep);
}

.page-faq .faq-q[open] .faq-q__ask::after {
  content: "–";
  color: var(--c-orange);
}

.page-faq .faq-q__body {
  position: relative;
  padding: 0 46px 20px 18px;
}

.page-faq .faq-q__body::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 22px;
  width: 3px;
  border-radius: 2px;
  background: var(--c-green);
}

.page-faq .faq-q__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-muted);
}

/* --- 勘误提交 --- */
.page-faq .faq-submit {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-submit li {
  padding: 16px 18px;
  background: var(--c-paper);
  border: 1px dashed var(--c-line);
  border-radius: var(--radius-card);
  transition: border-color .18s ease, background-color .18s ease;
}

.page-faq .faq-submit li:hover {
  border-color: var(--c-green);
  background: var(--c-green-pale);
}

.page-faq .faq-submit__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-faq .faq-submit__v {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-faq .faq-submit__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--c-line);
}

.page-faq .faq-submit__foot .faq-text {
  flex: 1 1 320px;
  margin: 0;
}

/* --- 响应式 --- */
@media (min-width: 720px) {
  .page-faq .faq-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-faq .faq-submit {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .faq-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-faq .faq-split--media-left {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }
}

@media (min-width: 980px) {
  .page-faq .faq-layout {
    grid-template-columns: 218px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-faq .faq-toc {
    position: sticky;
    top: 104px;
  }

  .page-faq .faq-toc__label {
    padding-left: 2px;
  }

  .page-faq .faq-toc__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-toc__item {
    flex: 1 1 auto;
  }

  .page-faq .faq-toc__link {
    display: flex;
    padding: 9px 12px;
    border-color: transparent;
    border-radius: 10px;
    background: transparent;
    white-space: normal;
    font-size: 14px;
  }

  .page-faq .faq-toc__link:hover,
  .page-faq .faq-toc__link:focus-visible {
    border-color: var(--c-green);
    color: var(--c-green-deep);
    background: var(--c-green-pale);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-step,
  .page-faq .faq-toc__link,
  .page-faq .faq-submit li,
  .page-faq .faq-q__ask,
  .page-faq .faq-q__ask::after,
  .page-faq .faq-scene,
  .page-faq .faq-inline-link {
    transition: none;
  }
}