/* ===== 知识中心 · page-faq ===== */

.page-faq {
  background:
    radial-gradient(1100px 520px at 88% -6%, rgba(34, 199, 255, 0.13), transparent 62%),
    radial-gradient(900px 520px at 2% 44%, rgba(58, 141, 255, 0.07), transparent 60%),
    var(--c-night);
  color: var(--c-paper);
}

/* ---- 首屏 ---- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.4rem, 6vw, 4.6rem) 0 clamp(2.1rem, 5vw, 3.6rem);
  background: linear-gradient(148deg, rgba(20, 41, 92, 0.88) 0%, rgba(11, 27, 58, 0.94) 44%, var(--c-black) 100%);
  border-bottom: 1px solid rgba(30, 58, 107, 0.8);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-neon);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -46%;
  width: min(640px, 86vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(132deg, rgba(34, 199, 255, 0.22), rgba(58, 141, 255, 0) 70%);
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-faq .faq-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0;
  padding: 0.36rem 0.95rem;
  border: 1px solid rgba(34, 199, 255, 0.42);
  border-radius: 999px;
  background: rgba(34, 199, 255, 0.09);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
}

.page-faq .faq-hero__kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 10px rgba(34, 199, 255, 0.9);
}

.page-faq .faq-hero h1 {
  margin: clamp(1rem, 2.6vw, 1.6rem) 0 0;
  max-width: 22ch;
  font-size: clamp(2rem, 6vw, 3.9rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-faq .faq-hero h1 {
    background: linear-gradient(104deg, #F2F5FA 30%, #A9DEFF 68%, #22C7FF 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-faq .faq-hero__lead {
  margin: clamp(1rem, 2vw, 1.35rem) 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.4vw, 1.06rem);
  line-height: 1.8;
  color: var(--c-silver);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2.1rem);
}

/* ---- 面包屑 ---- */

.page-faq .faq-crumb {
  margin-top: 1.15rem;
}

.page-faq .faq-crumb .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-muted);
}

.page-faq .faq-crumb .breadcrumb-list li + li::before {
  content: "/";
  margin: 0 0.55rem;
  color: var(--c-line);
}

.page-faq .faq-crumb a {
  color: var(--c-muted);
  text-decoration: none;
}

.page-faq .faq-crumb a:hover,
.page-faq .faq-crumb a:focus-visible {
  color: var(--c-cyan);
}

/* ---- 主体骨架 ---- */

.page-faq .faq-body {
  padding: clamp(2rem, 5vw, 3.4rem) 0 clamp(3rem, 6vw, 4.8rem);
}

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.4rem);
}

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

/* ---- 分类索引 ---- */

.page-faq .faq-index__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.page-faq .faq-index__list {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-index__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
  padding: 0.72rem 0.85rem;
  border-left: 2px solid var(--c-line);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(20, 41, 92, 0.3);
  color: var(--c-silver);
  font-size: 0.94rem;
  text-decoration: none;
  transition: border-color 0.28s var(--ease), background-color 0.28s var(--ease), color 0.28s var(--ease);
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  border-left-color: var(--c-cyan);
  background: rgba(34, 199, 255, 0.13);
  color: var(--c-paper);
}

.page-faq .faq-index__num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--c-cyan);
}

.page-faq .faq-index__label {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-faq .faq-index__count {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--c-muted);
}

.page-faq .faq-index__note {
  margin: 0.95rem 0 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---- 章节头 ---- */

.page-faq .faq-intro__figure {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
}

.page-faq .frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: rgba(11, 27, 58, 0.62);
  border: 1px solid rgba(30, 58, 107, 0.7);
}

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

.page-faq .faq-flow {
  margin: 1.15rem 0 1.15rem;
}

/* ---- 问答分组 ---- */

.page-faq .faq-group {
  margin-top: clamp(2.2rem, 4.5vw, 3.4rem);
  scroll-margin-top: calc(var(--header-h) + 2rem);
}

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

.page-faq .faq-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.4rem 1rem;
  padding-bottom: 0.9rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .faq-group__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
  text-shadow: 0 0 22px rgba(34, 199, 255, 0.45);
}

.page-faq .faq-group__title {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-faq .faq-group__note {
  margin: 0.42rem 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--c-muted);
}

/* ---- 可展开问答 ---- */

.page-faq .qa-list {
  display: grid;
  gap: 0.62rem;
}

.page-faq .qa {
  border: 1px solid rgba(30, 58, 107, 0.75);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(20, 41, 92, 0.32), rgba(11, 27, 58, 0.55));
  transition: border-color 0.28s var(--ease), background 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-faq .qa:hover {
  border-color: rgba(34, 199, 255, 0.4);
}

.page-faq .qa[open] {
  border-color: rgba(34, 199, 255, 0.6);
  background: linear-gradient(180deg, rgba(20, 41, 92, 0.6), rgba(11, 27, 58, 0.78));
  box-shadow: var(--shadow-panel);
}

.page-faq .qa__q {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.8rem;
  padding: 0.92rem 1.05rem;
  list-style: none;
  cursor: pointer;
  font-size: 0.99rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--c-paper);
}

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

.page-faq .qa__mark {
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: var(--r-sm);
  border: 1px solid rgba(34, 199, 255, 0.45);
  background: rgba(34, 199, 255, 0.16);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1;
}

.page-faq .qa[open] .qa__mark {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-black);
}

.page-faq .qa__q::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  transform: rotate(-135deg);
}

.page-faq .qa__a {
  padding: 0 1.05rem 1.05rem 3.45rem;
  color: var(--c-silver);
  font-size: 0.95rem;
  line-height: 1.8;
}

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

.page-faq .qa__a p + p {
  margin-top: 0.65rem;
}

.page-faq .qa__do {
  color: var(--c-cyan);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px dashed rgba(34, 199, 255, 0.55);
}

a.qa__do:hover,
a.qa__do:focus-visible {
  border-bottom-style: solid;
}

/* ---- 记录字段提示卡 ---- */

.page-faq .faq-fields {
  margin-top: 1.1rem;
  padding: 1.05rem 1.15rem;
  border: 1px solid rgba(30, 58, 107, 0.8);
  border-left: 3px solid var(--c-cyan);
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(30, 58, 107, 0.5), rgba(11, 27, 58, 0.72));
}

.page-faq .faq-fields__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-faq .faq-fields__list {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-fields__list li {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) minmax(0, 1fr);
  gap: 0.35rem 1rem;
  align-items: baseline;
  padding: 0.55rem 0.65rem;
  border-radius: var(--r-sm);
  transition: background-color 0.25s var(--ease);
}

.page-faq .faq-fields__list li:hover {
  background: rgba(34, 199, 255, 0.09);
}

.page-faq .faq-fields__key {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--c-paper);
}

.page-faq .faq-fields__val {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--c-silver);
}

/* ---- 人工支持卡 ---- */

.page-faq .faq-assist {
  margin-top: 1.3rem;
  padding: clamp(1.2rem, 3vw, 1.7rem);
  border: 1px solid rgba(34, 199, 255, 0.28);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(34, 199, 255, 0.13), rgba(11, 27, 58, 0.86) 58%), var(--c-mid);
}

.page-faq .faq-assist__title {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-faq .faq-assist__list {
  display: grid;
  gap: 0.55rem;
  margin: 0.95rem 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-assist__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.75rem;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--c-silver);
}

.page-faq .faq-assist__n {
  display: grid;
  place-items: center;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  border: 1px solid rgba(34, 199, 255, 0.55);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
}

.page-faq .faq-assist__meta {
  margin: 1rem 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-faq .faq-assist__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.1rem;
}

/* ---- 渐显动效 ---- */

.page-faq [data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.js-ready .page-faq [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}

.js-ready .page-faq [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---- 响应式 ---- */

@media (max-width: 899px) {
  .page-faq .faq-index__list {
    grid-auto-flow: column;
    grid-auto-columns: 12rem;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    padding-bottom: 0.6rem;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-shell {
    grid-template-columns: minmax(15rem, 17.5rem) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }
}

@media (max-width: 640px) {
  .page-faq .qa__a {
    padding-left: 1.05rem;
  }

  .page-faq .qa__q {
    font-size: 0.95rem;
  }
}

@media (max-width: 520px) {
  .page-faq .faq-fields__list li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .page-faq .faq-group__head {
    gap: 0.3rem 0.75rem;
  }
}

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

  .js-ready .page-faq [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .page-faq .qa__q::after,
  .page-faq .qa,
  .page-faq .faq-index__link {
    transition: none;
  }
}