.page-faq {
  --faq-line: #D8DEE8;
  --faq-node-bg: #FFFFFF;
  overflow-x: hidden;
}

/* ===== 封面首屏 ===== */
.page-faq-hero {
  background:
    radial-gradient(ellipse at 82% 18%, rgba(255, 107, 44, 0.14) 0%, transparent 52%),
    linear-gradient(135deg, var(--navy-950) 0%, var(--navy-900) 100%);
  color: var(--white);
  padding: 120px 0 72px;
  position: relative;
  overflow: hidden;
}

.page-faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

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

.page-faq-hero__breadcrumb {
  margin-bottom: 40px;
  opacity: 0.75;
}

.page-faq-hero__breadcrumb .breadcrumb__item {
  color: var(--gray-300);
}

.page-faq-hero__breadcrumb .breadcrumb__item[aria-current="page"] {
  color: var(--white);
}

.page-faq-hero__breadcrumb .breadcrumb__separator {
  color: var(--gray-700);
}

.page-faq-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-faq-hero__content h1 {
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 16px 0 20px;
  font-weight: 800;
}

.page-faq-hero__content .editorial-lead {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  max-width: 560px;
}

.page-faq-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 36px;
}

.page-faq-hero__stats .data-stat {
  display: flex;
  flex-direction: column;
}

.page-faq-hero__stats .data-number {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--orange-500);
  line-height: 1;
}

.page-faq-hero__stats .data-label {
  font-size: 12px;
  color: var(--gray-300);
  margin-top: 6px;
}

.page-faq-hero__image {
  max-width: 420px;
  margin-inline: auto;
  position: relative;
}

.page-faq-hero__image img {
  width: 100%;
  height: auto;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
  display: block;
}

/* ===== 技能树主区 ===== */
.page-faq-tree {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding: 64px 0 16px;
}

/* 左索引 */
.page-faq-index__head h2 {
  font-size: 24px;
  margin: 12px 0 8px;
  color: var(--gray-900);
}

.page-faq-index__head p {
  color: var(--gray-700);
  font-size: 14px;
  margin: 0;
}

.page-faq-index__nav {
  margin-top: 28px;
  padding-left: 28px;
  position: relative;
}

.page-faq-index__nav::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--faq-line);
  transition: background 0.3s;
}

.page-faq:has(.page-faq-detail[open]) .page-faq-index__nav::before {
  background: var(--orange-400);
}

.page-faq-index__item {
  position: relative;
  display: block;
  padding: 14px 16px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--gray-900);
  transition: background 0.2s, box-shadow 0.2s;
}

.page-faq-index__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--faq-line);
  transition: border-color 0.2s, background 0.2s;
}

.page-faq-index__item::after {
  content: "";
  position: absolute;
  left: -22px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 2px;
  background: var(--faq-line);
  transition: background 0.2s;
}

.page-faq-index__item:hover {
  background: var(--gray-100);
  box-shadow: inset 3px 0 0 var(--orange-500);
}

.page-faq-index__item:hover::before {
  border-color: var(--orange-500);
  background: var(--orange-500);
}

.page-faq-index__item:hover::after {
  background: var(--orange-500);
}

.page-faq-index__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange-500);
  font-weight: 700;
}

.page-faq-index__label {
  display: block;
  font-size: 16px;
  font-weight: 700;
  margin-top: 2px;
}

.page-faq-index__desc {
  display: block;
  font-size: 13px;
  color: var(--gray-700);
  margin-top: 4px;
}

.page-faq-index__aside {
  margin-top: 32px;
  padding: 18px;
  border-radius: 12px;
  border: 1px dashed var(--gray-300);
  background: var(--gray-100);
  font-size: 13px;
  color: var(--gray-700);
  line-height: 1.7;
}

.page-faq-index__aside p {
  margin: 0 0 12px;
}

/* 右答案区 */
.page-faq-answers {
  display: grid;
  gap: 32px;
}

.page-faq-node {
  background: var(--faq-node-bg);
  border: 1px solid var(--gray-300);
  border-radius: 16px;
  padding: 24px;
  position: relative;
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
}

.page-faq-node:hover {
  box-shadow: 0 12px 32px rgba(8, 19, 46, 0.08);
  transform: translateY(-4px);
  border-color: var(--orange-400);
}

.page-faq-node__top {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 8px;
}

.page-faq-node__num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--orange-500);
  background: rgba(255, 107, 44, 0.08);
  border-radius: 8px;
  padding: 6px 10px;
  flex-shrink: 0;
}

.page-faq-node h2 {
  font-size: 22px;
  margin: 0 0 4px;
  color: var(--gray-900);
}

.page-faq-node__lead {
  font-size: 14px;
  color: var(--gray-700);
  margin: 0;
}

/* 重要节点橙色高亮 */
.page-faq-node--accent {
  border-color: var(--orange-500);
  background: linear-gradient(180deg, #FFF8F4 0%, var(--white) 100%);
}

.page-faq-node--accent .page-faq-node__num {
  background: var(--orange-500);
  color: var(--white);
}

/* details 展开项 */
.page-faq-detail {
  border-top: 1px solid var(--gray-300);
}

.page-faq-detail:first-child {
  border-top: 0;
}

.page-faq-detail__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 8px 16px 0;
  font-weight: 600;
  font-size: 15px;
  line-height: 1.5;
  color: var(--gray-900);
  transition: color 0.2s;
}

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

.page-faq-detail__summary:hover {
  color: var(--orange-500);
}

.page-faq-detail__summary::after {
  content: "";
  margin-left: auto;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--gray-700);
  border-bottom: 2px solid var(--gray-700);
  transform: rotate(45deg);
  transition: transform 0.25s, border-color 0.25s;
  flex-shrink: 0;
  margin-top: 7px;
}

.page-faq-detail[open] .page-faq-detail__summary::after {
  transform: rotate(225deg);
  border-color: var(--orange-500);
}

.page-faq-detail__q {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--orange-500);
  border: 1px solid var(--orange-400);
  border-radius: 6px;
  padding: 2px 6px;
  flex-shrink: 0;
  margin-top: 2px;
}

.page-faq-detail__content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding: 0 8px 0 44px;
  color: var(--gray-700);
  font-size: 14px;
  line-height: 1.75;
  transition: max-height 0.35s ease, opacity 0.35s ease, padding 0.35s ease;
}

.page-faq-detail[open] .page-faq-detail__content {
  max-height: 500px;
  opacity: 1;
  padding-bottom: 18px;
}

.page-faq-detail__content p {
  margin: 0;
}

.page-faq-detail__content a {
  color: var(--orange-500);
  font-weight: 600;
  text-decoration-color: var(--orange-400);
}

.page-faq-detail__content a:hover {
  text-decoration-style: wavy;
}

/* 7 天热区图 */
.page-faq-heatmap {
  display: flex;
  gap: 6px;
  margin-top: 14px;
}

.page-faq-heatmap__cell {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  background: var(--gray-300);
  transition: background 0.2s, transform 0.2s;
}

.page-faq-heatmap__cell.is-on {
  background: var(--orange-500);
}

.page-faq-heatmap__cell:hover {
  transform: scale(1.12);
}

.page-faq-heatmap__legend {
  font-size: 12px;
  color: var(--gray-700);
  margin-top: 8px;
}

/* 节点下方图片 */
.page-faq-node__media {
  margin-top: 20px;
}

.page-faq-node__media img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  display: block;
  object-fit: cover;
  border: 1px solid var(--gray-300);
}

/* 节点底部 CTA */
.page-faq-node__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--gray-300);
}

/* ===== 底部提示条 ===== */
.page-faq-tip {
  margin-top: 64px;
  background: var(--navy-950);
  padding: 48px 0;
  position: relative;
  overflow: hidden;
}

.page-faq-tip::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 180px;
  height: 180px;
  border: 2px solid rgba(255, 107, 44, 0.4);
  border-radius: 50%;
}

.page-faq-tip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  position: relative;
  z-index: 1;
}

.page-faq-tip__marker {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--orange-500);
  border: 1px solid var(--orange-500);
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.06em;
}

.page-faq-tip p {
  color: var(--gray-300);
  font-size: 14px;
  flex: 1 1 260px;
  margin: 0;
  line-height: 1.7;
}

.page-faq-tip .button {
  flex-shrink: 0;
}

/* ===== 桌面端 ===== */
@media (min-width: 900px) {
  .page-faq-hero {
    padding: 140px 0 96px;
  }

  .page-faq-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 60px;
    align-items: center;
  }

  .page-faq-hero__image {
    margin-inline: 0;
    justify-self: end;
  }

  .page-faq-tree {
    grid-template-columns: 4fr 8fr;
    gap: 64px;
    padding: 88px 0 24px;
  }

  .page-faq-index {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-right: 28px;
    border-right: 1px solid var(--gray-300);
  }

  .page-faq-node {
    padding: 32px;
  }

  .page-faq-node__num {
    font-size: 20px;
  }
}