/* ===== 知识中心 · 页面专属样式 ===== */
.page-faq {
  --faq-hair: rgba(138, 110, 47, 0.34);
  --faq-hair-gold: rgba(200, 162, 74, 0.30);
  --faq-paper: #F7F4EE;
  display: block;
  overflow-x: hidden;
  color: var(--ink);
  background: linear-gradient(180deg, #EDE8DF 0%, #E4DDD2 44%, #CFC7BA 100%);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--topbar-h) + 46px) 0 42px;
  color: var(--paper);
  background: radial-gradient(120% 100% at 84% 0%, #23252B 0%, #101116 46%, #060607 100%);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(200, 162, 74, 0.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(200, 162, 74, 0.09) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 86%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.95), transparent 86%);
}

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

.page-faq .faq-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-faq .faq-hero .breadcrumb a {
  color: var(--gold);
  text-decoration: none;
}

.page-faq .faq-hero .breadcrumb a:hover {
  color: var(--gold-hi);
}

.page-faq .faq-hero .breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: rgba(110, 115, 120, 0.7);
}

.page-faq .faq-hero .breadcrumb [aria-current="page"] {
  color: rgba(247, 244, 238, 0.68);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 34px;
}

.page-faq .faq-hero .eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.page-faq .faq-hero h1 {
  margin: 0 0 22px;
  font-size: clamp(38px, 8.4vw, 92px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-faq .faq-hero__intro {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(247, 244, 238, 0.76);
}

.page-faq .faq-hero__side {
  padding-top: 20px;
  border-top: 1px solid var(--faq-hair-gold);
}

.page-faq .faq-hero__tip {
  margin: 0 0 22px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 244, 238, 0.8);
}

.page-faq .faq-hero__tip span {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold-hi);
}

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

.page-faq .faq-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(200, 162, 74, 0.16);
}

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

.page-faq .faq-hero__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  font-weight: 600;
  color: var(--gold-hi);
  letter-spacing: 0.02em;
}

.page-faq .faq-hero__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(247, 244, 238, 0.66);
}

/* ---------- 刻度式索引条 ---------- */
.page-faq .faq-index {
  background: var(--faq-paper);
  border-top: 2px solid var(--gold);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-index__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__item {
  position: relative;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 18px 16px 20px 18px;
  border-right: 1px solid var(--faq-hair);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-index__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 1px;
  height: 16px;
  background: var(--gold);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-line);
  padding-top: 3px;
}

.page-faq .faq-index__body {
  min-width: 0;
}

.page-faq .faq-index__cat {
  display: inline-block;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-decoration: none;
}

.page-faq .faq-index__cat:hover {
  color: var(--vermilion);
}

.page-faq .faq-index__sub {
  margin: 6px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
}

.page-faq .faq-index__sub a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-faq .faq-index__sub a:hover {
  color: var(--vermilion-dark);
  border-bottom-color: var(--gold);
}

.page-faq .faq-index__sub span {
  color: rgba(110, 115, 120, 0.5);
}

/* ---------- 章节骨架 ---------- */
.page-faq .faq-sec {
  padding: 42px 0;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-index + .faq-sec {
  border-top: 0;
}

.page-faq .faq-sec--history {
  border-top: 1px solid var(--gold-line);
}

.page-faq .faq-sec__inner {
  display: grid;
  gap: 18px;
}

.page-faq .faq-sec__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-faq .faq-sec__rail .section-no {
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--gold-line);
}

.page-faq .faq-sec__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-faq .faq-sec__body {
  min-width: 0;
}

.page-faq .faq-sec__body h2 {
  margin: 0 0 16px;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-faq .faq-sec__body h3 {
  margin: 30px 0 12px;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

.page-faq .faq-sec__body p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: #232830;
}

.page-faq .faq-sec__body p a {
  color: var(--vermilion-dark);
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 58, 44, 0.4);
}

.page-faq .faq-sec__body p a:hover {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

/* ---------- 浏览器标签 ---------- */
.page-faq .faq-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 4px;
  padding: 0;
  list-style: none;
}

.page-faq .faq-chips li {
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--ink-2);
  background: rgba(247, 244, 238, 0.72);
  border: 1px solid var(--faq-hair);
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--faq-hair);
  counter-reset: faqstep;
}

.page-faq .faq-steps li {
  position: relative;
  padding: 15px 0 15px 46px;
  border-bottom: 1px solid var(--faq-hair);
  font-size: 15.5px;
  line-height: 1.78;
  color: #232830;
}

.page-faq .faq-steps li::before {
  counter-increment: faqstep;
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-line);
}

/* ---------- 图示 ---------- */
.page-faq .faq-figure {
  margin: 28px 0 0;
  padding: 10px;
  background: var(--faq-paper);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-faq .faq-figure figcaption {
  padding: 10px 2px 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-faq .faq-path {
  display: block;
  width: 100%;
  height: auto;
  margin: 22px 0 0;
}

/* ---------- 折叠问答 ---------- */
.page-faq .faq-q {
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-q > summary {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  list-style: none;
  cursor: pointer;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  transition: color 0.2s var(--ease);
}

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

.page-faq .faq-q > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold-line);
  transition: color 0.2s var(--ease);
}

.page-faq .faq-q[open] > summary {
  color: var(--vermilion-dark);
}

.page-faq .faq-q[open] > summary::after {
  content: "−";
  color: var(--vermilion);
}

.page-faq .faq-q > summary:hover {
  color: var(--vermilion);
}

.page-faq .faq-q__body {
  padding: 0 0 20px;
}

.page-faq .faq-q__body p {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: #2A2F37;
}

/* ---------- 对照模式 ---------- */
.page-faq .faq-modes {
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-modes > div {
  padding: 18px 18px 20px;
  background: var(--faq-paper);
}

.page-faq .faq-modes h4 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--gold-line);
}

.page-faq .faq-modes p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #2A2F37;
}

.page-faq .faq-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
  line-height: 1.6;
  color: #2A2F37;
}

.page-faq .faq-legend i {
  display: inline-block;
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  background: var(--slate);
}

.page-faq .faq-legend i.is-red {
  background: var(--vermilion);
}

.page-faq .faq-legend i.is-gold {
  background: var(--gold);
}

.page-faq .faq-legend i.is-slate {
  background: var(--slate);
}

/* ---------- 材料清单 ---------- */
.page-faq .faq-materials {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

.page-faq .faq-materials__group {
  padding: 18px 16px 6px;
  background: var(--faq-paper);
  border: 1px solid var(--gold-line);
}

.page-faq .faq-materials__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 2px;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-materials__head h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-faq .faq-materials__count {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--gold-line);
}

.page-faq .faq-check {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-check li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px dashed rgba(138, 110, 47, 0.26);
}

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

.page-faq .faq-check input {
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
  margin: 5px 0 0;
  padding: 0;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  border: 1px solid var(--gold-line);
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-check input:checked {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: inset 0 0 0 3px var(--faq-paper);
}

.page-faq .faq-check input:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
}

.page-faq .faq-check label {
  cursor: pointer;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
}

.page-faq .faq-check label b {
  display: block;
  font-weight: 700;
}

.page-faq .faq-check label span {
  display: block;
  margin-top: 2px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--slate);
}

.page-faq .faq-check input:checked + label {
  color: var(--slate);
}

.page-faq .faq-ready {
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--vermilion);
  opacity: 0;
  transition: opacity 0.24s var(--ease);
}

.page-faq .faq-materials__group:has(input:checked):not(:has(input:not(:checked))) .faq-ready {
  opacity: 1;
}

/* ---------- 问题分类索引 ---------- */
.page-faq .faq-indexgrid {
  display: grid;
  gap: 1px;
  margin-top: 24px;
  background: var(--faq-hair);
  border: 1px solid var(--faq-hair);
}

.page-faq .faq-indexgrid > div {
  padding: 18px;
  background: rgba(247, 244, 238, 0.9);
}

.page-faq .faq-indexgrid h3 {
  margin: 0;
  padding-bottom: 10px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--gold-line);
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-indexgrid ul {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-indexgrid a {
  font-size: 14px;
  line-height: 1.6;
  color: #2A2F37;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-indexgrid a:hover {
  color: var(--vermilion);
  border-bottom-color: var(--gold);
}

.page-faq .faq-mail {
  margin-top: 26px;
  padding: 16px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-2);
  background: rgba(247, 244, 238, 0.85);
  border-left: 2px solid var(--gold);
}

.page-faq .faq-mail strong {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--vermilion-dark);
  word-break: break-all;
}

/* ---------- 历史版本对照 ---------- */
.page-faq .faq-timeline {
  margin: 24px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--faq-hair);
}

.page-faq .faq-timeline li {
  position: relative;
  padding: 0 0 22px;
}

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

.page-faq .faq-timeline li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--gold);
}

.page-faq .faq-timeline b {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--gold-line);
}

.page-faq .faq-timeline p {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.78;
  color: #2A2F37;
}

/* ---------- 显现动画 ---------- */
.page-faq [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.page-faq [data-reveal].is-in,
.page-faq .js-off [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------- 断点：平板 ---------- */
@media (min-width: 760px) {
  .page-faq .faq-hero {
    padding: calc(var(--topbar-h) + 64px) 0 54px;
  }

  .page-faq .faq-hero__intro {
    font-size: 17px;
  }

  .page-faq .faq-index__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-index__item {
    border-bottom: 0;
  }

  .page-faq .faq-index__item:last-child {
    border-right: 0;
  }

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

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

/* ---------- 断点：桌面 ---------- */
@media (min-width: 940px) {
  .page-faq .faq-hero {
    padding: calc(var(--topbar-h) + 88px) 0 72px;
  }

  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    gap: 64px;
    align-items: end;
  }

  .page-faq .faq-hero__side {
    padding-top: 0;
    padding-left: 26px;
    border-top: 0;
    border-left: 1px solid var(--faq-hair-gold);
  }

  .page-faq .faq-sec {
    padding: 60px 0;
  }

  .page-faq .faq-sec__inner {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-sec__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }

  .page-faq .faq-sec__rail .section-no {
    font-size: 40px;
  }

  .page-faq .faq-materials {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-faq .faq-sec__body p {
    font-size: 16.5px;
  }
}

@media (min-width: 1180px) {
  .page-faq .faq-indexgrid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-faq .faq-q > summary,
  .page-faq .faq-q > summary::after,
  .page-faq .faq-check input,
  .page-faq .faq-ready,
  .page-faq .faq-indexgrid a {
    transition: none;
  }
}