.page-faq {
  display: block;
  background: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-faq .page-faq__hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  padding: 20px 0 clamp(40px, 7vw, 76px);
}

.page-faq .page-faq__hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 84%;
  background: linear-gradient(118deg, rgba(13, 58, 56, 0.92) 0%, rgba(11, 16, 48, 0) 58%);
  clip-path: polygon(0 0, 100% 0, 100% 26%, 0 100%);
  pointer-events: none;
}

.page-faq .page-faq__hero::after {
  content: "";
  position: absolute;
  top: -12%;
  right: 16%;
  width: 1px;
  height: 132%;
  background: linear-gradient(180deg, transparent, var(--line) 28%, transparent 78%);
  transform: rotate(15deg);
  transform-origin: top center;
  pointer-events: none;
}

.page-faq .page-faq__hero > .container {
  position: relative;
  z-index: 1;
}

.page-faq .faq-hero {
  display: grid;
  gap: 32px;
  margin-top: clamp(20px, 4vw, 40px);
}

.page-faq .faq-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-faq .faq-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.16;
  font-size: clamp(30px, 7.4vw, 60px);
  color: var(--snow);
}

.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-faq .faq-hero__badges li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  font-size: 13px;
  color: var(--fog);
  border: 1px solid var(--line);
  background: rgba(30, 37, 66, 0.5);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-faq .faq-hero__badges .mono {
  color: var(--cyan);
  font-size: 13px;
}

.page-faq .faq-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

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

.page-faq .faq-hero__figure figcaption {
  padding: 12px 18px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--fog);
}

/* ---------- 主体布局 ---------- */

.page-faq .page-faq__body {
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-faq .faq-layout {
  display: grid;
  gap: 30px;
  align-items: start;
}

/* ---------- 左侧三步路径 ---------- */

.page-faq .faq-rail {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px 18px 24px;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-faq .faq-rail .chapter {
  margin-bottom: 4px;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 10px;
  align-items: stretch;
  list-style: none;
  margin: 20px 0 0;
  padding: 0 2px 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-rail__list::-webkit-scrollbar {
  height: 4px;
}

.page-faq .faq-rail__list::-webkit-scrollbar-thumb {
  background: var(--line);
}

.page-faq .faq-rail__list > li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-faq .faq-step {
  width: 232px;
}

.page-faq .faq-step__check {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  margin: 0;
}

.page-faq .faq-step__label {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 10px;
  padding: 13px 14px 15px;
  border: 1px solid var(--line);
  background: var(--mist);
  cursor: pointer;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-step__label:hover {
  border-color: var(--cyan);
}

.page-faq .faq-step__no {
  grid-column: 1;
  grid-row: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: 12px;
  color: var(--violet);
  border: 1px solid var(--violet);
  transition: background-color 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-faq .faq-step__name {
  grid-column: 2;
  grid-row: 1;
  align-self: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-faq .faq-step__hint {
  grid-column: 1 / -1;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog);
}

.page-faq .faq-step__check:checked + .faq-step__label {
  border-color: var(--cyan);
}

.page-faq .faq-step__check:checked + .faq-step__label .faq-step__no {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-faq .faq-step__check:focus-visible + .faq-step__label {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-faq .faq-rail__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan);
  opacity: 0.75;
  transform: rotate(90deg);
}

.page-faq .faq-arrow {
  display: block;
}

.page-faq .faq-rail__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 问题分组 ---------- */

.page-faq .faq-groups {
  display: grid;
  gap: 26px;
  min-width: 0;
}

.page-faq .faq-group {
  position: relative;
  padding: 26px 18px 30px;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-faq .faq-group--deep {
  background: var(--deep-teal);
}

.page-faq .faq-group--wine {
  background: var(--wine);
}

.page-faq .faq-group--mist {
  background: var(--mist);
}

.page-faq .faq-group--panel {
  background: var(--panel);
}

.page-faq .faq-group .chapter {
  margin-bottom: 4px;
}

.page-faq .faq-group .chapter__num {
  color: var(--violet);
}

/* ---------- 手风琴 ---------- */

.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-faq .faq-item {
  border: 1px solid var(--line);
  background: rgba(11, 16, 48, 0.46);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(47, 227, 224, 0.62);
}

.page-faq .faq-item[open] {
  border-color: var(--cyan);
  background: rgba(11, 16, 48, 0.72);
}

.page-faq .faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  line-height: 1.55;
  color: var(--snow);
}

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

.page-faq .faq-item__q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .faq-item__mark {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: 1px solid var(--cyan);
}

.page-faq .faq-item__mark::before,
.page-faq .faq-item__mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 180ms var(--ease), opacity 180ms var(--ease);
}

.page-faq .faq-item__mark::before {
  top: 3px;
  bottom: 3px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
}

.page-faq .faq-item__mark::after {
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1px;
  transform: translateY(-50%);
}

.page-faq .faq-item[open] .faq-item__mark::before {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.page-faq .faq-item__a {
  padding: 0 16px 18px 46px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
  animation: faq-reveal 200ms var(--ease) both;
}

.page-faq .faq-item__a p {
  margin: 0 0 8px;
}

.page-faq .faq-item__a p:last-child {
  margin-bottom: 0;
}

.page-faq .faq-item__a a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-item__a a:hover {
  color: var(--snow);
}

.page-faq .faq-em {
  color: var(--cyan);
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 15px;
}

@keyframes faq-reveal {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 失败截图 ---------- */

.page-faq .faq-figure {
  margin: 22px 0 0;
}

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

/* ---------- 最后一组 ---------- */

.page-faq .faq-handoff {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
}

.page-faq .faq-handoff li {
  padding: 12px 14px;
  border-left: 2px solid var(--amber);
  background: rgba(11, 16, 48, 0.5);
  font-size: 15px;
  line-height: 1.75;
  color: var(--snow);
}

.page-faq .faq-handoff__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

.page-faq .faq-handoff__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-handoff__note a:hover {
  color: var(--snow);
}

/* ---------- 断点 ---------- */

@media (min-width: 760px) {
  .page-faq .faq-group {
    padding: 30px 28px 34px;
  }

  .page-faq .faq-item__q {
    padding: 17px 22px;
    font-size: 17px;
  }

  .page-faq .faq-item__a {
    padding: 0 22px 20px 52px;
  }

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

  .page-faq .faq-rail__list {
    gap: 14px;
  }

  .page-faq .faq-step {
    width: 260px;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: center;
    gap: 52px;
  }

  .page-faq .faq-layout {
    grid-template-columns: 326px minmax(0, 1fr);
    gap: 52px;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 96px;
    padding: 26px 22px 28px;
  }

  .page-faq .faq-rail__list {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-faq .faq-rail__list > li {
    scroll-snap-align: none;
  }

  .page-faq .faq-step {
    width: auto;
  }

  .page-faq .faq-rail__arrow {
    transform: none;
    padding: 2px 0;
    justify-content: flex-start;
    margin-left: 27px;
    opacity: 0.7;
  }
}

@media (min-width: 1200px) {
  .page-faq .faq-layout {
    grid-template-columns: 348px minmax(0, 1fr);
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-item__a {
    animation: none;
  }

  .page-faq .faq-item,
  .page-faq .faq-step__label,
  .page-faq .faq-item__mark::before,
  .page-faq .faq-item__mark::after,
  .page-faq .faq-step__no {
    transition: none;
  }
}