/* ============================================================
   帮助中心 /faq/ —— 页面专属样式，全部限定在 .page-faq 内
   ============================================================ */

.page-faq {
  --faq-cut: 20px;
  --faq-panel: linear-gradient(158deg, rgba(27, 44, 96, 0.92) 0%, rgba(18, 34, 77, 0.8) 100%);
  --faq-rail: rgba(108, 123, 166, 0.28);
  position: relative;
  display: block;
  padding: clamp(92px, 13vw, 132px) 0 clamp(52px, 9vw, 100px);
  overflow-x: clip;
  isolation: isolate;
}

.page-faq::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 680px;
  background:
    radial-gradient(120% 78% at 80% 0%, rgba(36, 211, 238, 0.13), transparent 62%),
    radial-gradient(90% 66% at 6% 8%, rgba(255, 107, 26, 0.09), transparent 60%);
  pointer-events: none;
  z-index: -1;
}

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

/* ---------- 章节与长卷骨架 ---------- */

.page-faq .chapter {
  position: relative;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(34px, 6vw, 68px) clamp(18px, 5vw, 40px);
}

.page-faq .chapter > .wrap {
  width: auto;
  max-width: none;
  padding-inline: 0;
}

.page-faq .chapter__index {
  display: block;
  margin-bottom: 10px;
  font-size: 30px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(108, 123, 166, 0.55);
  font-variant-numeric: tabular-nums;
}

.page-faq .chapter__rail {
  display: none;
}

.page-faq .slash-band {
  margin: clamp(4px, 1.6vw, 16px) 0;
  opacity: 0.6;
}

/* ---------- 通用文字块 ---------- */

.page-faq h1 {
  margin: 12px 0 18px;
  font-size: clamp(2.05rem, 6.2vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--white);
}

.page-faq .lede {
  max-width: 58ch;
  margin: 0 0 26px;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.8;
  color: var(--mute);
}

.page-faq .section-head__title {
  margin: 8px 0 12px;
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .section-head__text {
  max-width: 62ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--mute);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-top: clamp(10px, 2vw, 20px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-faq .faq-hero__quick {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.page-faq .faq-hero .note {
  max-width: 46ch;
  margin: 0;
}

.page-faq .faq-hero__media {
  margin: 0;
}

.page-faq .faq-hero__media .media-frame__img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-faq .hl {
  color: var(--orange);
  background-image: linear-gradient(90deg, rgba(255, 107, 26, 0.5), rgba(255, 107, 26, 0));
  background-repeat: no-repeat;
  background-position: 0 0.86em;
  background-size: 100% 0.2em;
  padding: 0 0.04em;
}

/* ---------- 变更说明卡片 ---------- */

.page-faq .faq-cards {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-faq .faq-card {
  position: relative;
  background: var(--faq-panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  clip-path: polygon(
    0 0,
    100% 0,
    100% calc(100% - var(--faq-cut)),
    calc(100% - var(--faq-cut)) 100%,
    0 100%
  );
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-faq .faq-card:hover {
  border-color: rgba(36, 211, 238, 0.5);
  transform: translateY(-2px);
}

.page-faq .faq-card[open] {
  border-color: rgba(255, 107, 26, 0.42);
}

.page-faq .faq-card__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-card__num {
  font-size: 30px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(255, 107, 26, 0.8);
  font-variant-numeric: tabular-nums;
}

.page-faq .faq-card__title {
  font-size: 1.03rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-card__mark {
  position: relative;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-faq .faq-card__mark::before,
.page-faq .faq-card__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--orange);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-faq .faq-card__mark::before {
  width: 9px;
  height: 1.6px;
}

.page-faq .faq-card__mark::after {
  width: 1.6px;
  height: 9px;
}

.page-faq .faq-card[open] .faq-card__mark {
  background: rgba(255, 107, 26, 0.14);
  border-color: rgba(255, 107, 26, 0.62);
}

.page-faq .faq-card[open] .faq-card__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-faq .faq-card__body {
  padding: 16px 22px 24px;
  border-top: 1px solid var(--line-faint);
}

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

.page-faq .faq-card__body li {
  position: relative;
  padding-left: 18px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--mute);
}

.page-faq .faq-card__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-faq .faq-card__body b {
  color: var(--white);
  font-weight: 600;
}

/* ---------- 问答手册：左索引 + 右答案 ---------- */

.page-faq .faq-manual {
  display: grid;
  gap: clamp(22px, 3.6vw, 38px);
  margin-top: clamp(24px, 3.6vw, 42px);
}

.page-faq .faq-manual__index {
  border-top: 1px solid var(--faq-rail);
  border-bottom: 1px solid var(--faq-rail);
  padding: 16px 0;
  min-width: 0;
}

.page-faq .faq-manual__label {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-manual__index ol {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-faq .faq-manual__index li {
  flex: none;
}

.page-faq .faq-manual__index a {
  display: block;
  padding: 7px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 0.86rem;
  line-height: 1.5;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mute);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-faq .faq-manual__index a:hover {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(36, 211, 238, 0.1);
}

.page-faq .faq-manual__body {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-faq .faq-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0 2px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-group:first-child {
  margin-top: 0;
}

.page-faq .faq-group::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(36, 211, 238, 0.45), rgba(36, 211, 238, 0));
}

.page-faq .faq-item {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.6vw, 28px);
  background: linear-gradient(150deg, rgba(27, 44, 96, 0.58), rgba(10, 22, 51, 0.32));
  border: 1px solid var(--line-faint);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  scroll-margin-top: 116px;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-faq .faq-item:hover {
  border-color: var(--line-soft);
  border-left-color: var(--cyan);
}

.page-faq .faq-item:target {
  border-color: rgba(255, 107, 26, 0.4);
  border-left-color: var(--orange);
  background: linear-gradient(150deg, rgba(255, 107, 26, 0.1), rgba(10, 22, 51, 0.38));
}

.page-faq .faq-item h3 {
  margin: 0 0 10px;
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-faq .faq-item p {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.78;
  color: var(--mute);
}

.page-faq .faq-item p + p {
  margin-top: 10px;
}

.page-faq .faq-item a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 211, 238, 0.4);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-faq .faq-item a:hover {
  color: var(--orange);
  border-bottom-color: rgba(255, 107, 26, 0.6);
}

.page-faq .faq-manual__figure {
  margin: 4px 0 6px;
}

.page-faq .faq-manual__figure .media-frame__img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-faq .faq-diagram {
  display: block;
  width: 100%;
  max-width: 380px;
  height: auto;
  margin-top: 14px;
}

.page-faq .faq-diagram__cap {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--line);
}

/* ---------- 联系区 ---------- */

.page-faq .faq-contact__panel {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(26px, 4vw, 46px);
  background: var(--faq-panel);
}

.page-faq .faq-contact__intro h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-faq .faq-contact__intro p {
  margin: 0 0 22px;
  max-width: 48ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--mute);
}

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

.page-faq .faq-contact__list li {
  display: grid;
  gap: 5px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--line-faint);
}

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

.page-faq .faq-contact__key {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-faq .faq-contact__val {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 断点 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-faq .faq-contact__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-faq .chapter {
    padding-left: clamp(104px, 10vw, 138px);
    padding-right: clamp(28px, 3vw, 52px);
  }

  .page-faq .chapter__index {
    position: absolute;
    top: clamp(34px, 6vw, 68px);
    left: clamp(18px, 2vw, 34px);
    margin: 0;
    font-size: clamp(38px, 3.4vw, 54px);
  }

  .page-faq .chapter__rail {
    display: block;
    position: absolute;
    top: calc(clamp(34px, 6vw, 68px) + 8px);
    bottom: calc(clamp(34px, 6vw, 68px) + 8px);
    left: clamp(82px, 8vw, 110px);
    width: 1px;
    background: linear-gradient(180deg, var(--faq-rail), rgba(108, 123, 166, 0));
  }

  .page-faq .faq-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-faq .faq-manual {
    grid-template-columns: 262px minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 68px);
    align-items: start;
  }

  .page-faq .faq-manual__index {
    position: sticky;
    top: 112px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--faq-rail);
    padding: 0 0 0 20px;
  }

  .page-faq .faq-manual__index ol {
    display: grid;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-faq .faq-manual__index li {
    flex: initial;
  }

  .page-faq .faq-manual__index a {
    position: relative;
    padding: 7px 0;
    border: 0;
    border-radius: 0;
    white-space: normal;
    font-size: 0.88rem;
  }

  .page-faq .faq-manual__index a::before {
    content: "";
    position: absolute;
    left: -21px;
    top: 9px;
    bottom: 9px;
    width: 2px;
    background: transparent;
    transition: background-color 0.25s var(--ease);
  }

  .page-faq .faq-manual__index a:hover {
    background: transparent;
    border-color: transparent;
  }

  .page-faq .faq-manual__index a:hover::before {
    background: var(--cyan);
  }
}