.page-faq {
  --faq-rule: #1C3A56;
  --faq-hair: rgba(169, 188, 203, 0.2);
  --faq-warm-tint: rgba(255, 138, 61, 0.12);
  --faq-cool-tint: rgba(47, 224, 138, 0.1);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  padding-top: clamp(28px, 4vw, 52px);
  position: relative;
  overflow: hidden;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  top: -10%;
  left: -14%;
  width: 46vw;
  height: 46vw;
  max-width: 520px;
  max-height: 520px;
  border-radius: 48% 52% 60% 40% / 55% 45% 55% 45%;
  background: radial-gradient(circle at 40% 40%, rgba(255, 138, 61, 0.14), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

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

.page-faq .faq-hero__title {
  margin: 10px 0 0;
  font-size: clamp(46px, 11vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-faq .faq-hero__lede {
  margin: 18px 0 0;
  max-width: 40ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-hero__quick {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-faq .faq-hero__quick li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
}

.page-faq .faq-hero__quick .mono {
  color: var(--orange);
  font-size: 12px;
}

.page-faq .faq-hero__media {
  margin: clamp(28px, 4vw, 44px) 0 0;
  border-radius: var(--radius);
  position: relative;
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(11, 27, 43, 0.1), rgba(11, 27, 43, 0.72));
  pointer-events: none;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.78);
}

/* ---------- 四类入口 ---------- */

.page-faq .faq-cats-section {
  padding: clamp(36px, 5vw, 64px) 0 0;
}

.page-faq .faq-cats__heading {
  margin: 0 0 20px;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

.page-faq .faq-cats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-faq .faq-cat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px 20px;
  text-decoration: none;
  border-radius: 34px 22px 38px 24px;
  border: 1px solid var(--faq-hair);
  background: var(--ink-2);
  transition: transform 0.28s ease, border-color 0.28s ease, background 0.28s ease;
}

.page-faq .faq-cat--warm {
  background: linear-gradient(158deg, rgba(255, 138, 61, 0.15), rgba(18, 41, 63, 0.9) 62%);
  border-color: rgba(255, 138, 61, 0.34);
}

.page-faq .faq-cat--cool {
  background: linear-gradient(158deg, rgba(47, 224, 138, 0.13), rgba(18, 41, 63, 0.9) 62%);
  border-color: rgba(47, 224, 138, 0.3);
}

.page-faq .faq-cat:hover,
.page-faq .faq-cat:focus-visible {
  transform: translateY(-4px);
}

.page-faq .faq-cat--warm:hover,
.page-faq .faq-cat--warm:focus-visible {
  border-color: var(--orange);
}

.page-faq .faq-cat--cool:hover,
.page-faq .faq-cat--cool:focus-visible {
  border-color: var(--green);
}

.page-faq .faq-cat__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-faq .faq-cat--warm .faq-cat__num {
  color: var(--orange-soft);
}

.page-faq .faq-cat--cool .faq-cat__num {
  color: var(--green-soft);
}

.page-faq .faq-cat__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 26px);
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-faq .faq-cat__desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-faq .faq-cat__go {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-faq .faq-cat--warm .faq-cat__go {
  color: var(--orange);
}

.page-faq .faq-cat--cool .faq-cat__go {
  color: var(--green);
}

/* ---------- 双栏骨架 ---------- */

.page-faq .faq-layout {
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(40px, 6vw, 80px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

/* 移动端：粘性横向索引 */
.page-faq .faq-index {
  position: sticky;
  top: 8px;
  z-index: 6;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 2px 10px;
  margin: -8px -2px 0;
  background: linear-gradient(180deg, rgba(11, 27, 43, 0.96), rgba(11, 27, 43, 0.78) 70%, rgba(11, 27, 43, 0));
  backdrop-filter: blur(6px);
  scrollbar-width: none;
}

.page-faq .faq-index::-webkit-scrollbar {
  display: none;
}

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

.page-faq .faq-index__link {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--faq-hair);
  background: var(--ink-2);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.24s ease, color 0.24s ease, background 0.24s ease;
}

.page-faq .faq-index__link .chapter-index__num {
  font-size: 11px;
  color: var(--faq-rule);
  transition: color 0.24s ease;
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link[aria-current="true"] {
  border-color: var(--green);
  color: var(--paper);
  background: rgba(47, 224, 138, 0.1);
}

.page-faq .faq-index__link[aria-current="true"] .chapter-index__num {
  color: var(--green);
}

/* ---------- 章节 ---------- */

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

.page-faq .faq-chapter {
  position: relative;
  padding-bottom: clamp(36px, 5vw, 64px);
}

.page-faq .faq-chapter + .faq-chapter {
  padding-top: clamp(30px, 4vw, 48px);
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-chapter .chapter__number {
  position: absolute;
  top: -6px;
  right: 0;
  font-family: var(--font-display);
  font-size: clamp(74px, 17vw, 132px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(140, 53, 86, 0.6);
  pointer-events: none;
  user-select: none;
}

.page-faq .faq-chapter .chapter__head {
  position: relative;
  z-index: 1;
  max-width: 46ch;
}

.page-faq .faq-chapter .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 5vw, 38px);
  line-height: 1.12;
  letter-spacing: 0.005em;
  color: var(--paper);
}

.page-faq .faq-chapter .chapter__lede {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-chapter .chapter__body {
  margin-top: clamp(22px, 3vw, 32px);
  position: relative;
  z-index: 1;
}

/* ---------- 问答条目 ---------- */

.page-faq .qa {
  border-left: 3px solid transparent;
  padding-left: 0;
  margin-bottom: 4px;
  background: transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: border-color 0.24s ease, background 0.24s ease, padding 0.24s ease;
}

.page-faq .qa + .qa {
  border-top: 1px solid var(--faq-hair);
}

.page-faq .qa[open] {
  border-left-color: var(--orange);
  background: rgba(18, 41, 63, 0.5);
  padding-left: 16px;
  padding-right: 14px;
}

.page-faq .qa__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 4px;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  line-height: 1.55;
  color: var(--paper);
  transition: color 0.2s ease, padding 0.24s ease;
}

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

.page-faq .qa[open] .qa__q {
  padding: 16px 0 10px;
}

.page-faq .qa__q:hover {
  color: var(--orange-soft);
}

.page-faq .qa__num {
  flex: none;
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-faq .qa__text {
  flex: 1 1 auto;
  min-width: 0;
}

.page-faq .qa__mark {
  flex: none;
  position: relative;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  border-radius: 50%;
  border: 1px solid rgba(255, 138, 61, 0.6);
  transition: background 0.24s ease, border-color 0.24s ease;
}

.page-faq .qa__mark::before,
.page-faq .qa__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--orange);
  transform: translate(-50%, -50%);
  transition: height 0.24s ease, background 0.24s ease;
}

.page-faq .qa__mark::before {
  width: 9px;
  height: 1.5px;
}

.page-faq .qa__mark::after {
  width: 1.5px;
  height: 9px;
}

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

.page-faq .qa[open] .qa__mark::before {
  background: var(--ink);
}

.page-faq .qa[open] .qa__mark::after {
  background: var(--ink);
  height: 0;
}

.page-faq .qa__a {
  padding: 0 4px 18px;
}

.page-faq .qa[open] .qa__a {
  padding: 0 0 18px;
  animation: faq-open 0.28s ease both;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-faq .qa__a a {
  color: var(--green-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 243, 188, 0.42);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-faq .qa__a a:hover {
  color: var(--green);
  border-color: var(--green);
}

@keyframes faq-open {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa[open] .qa__a {
    animation: none;
  }
  .page-faq .faq-cat,
  .page-faq .qa,
  .page-faq .qa__mark,
  .page-faq .qa__mark::before,
  .page-faq .qa__mark::after {
    transition: none;
  }
}

/* ---------- 三步选择 ---------- */

.page-faq .faq-steps {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-faq .faq-step {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 20px 18px;
  border-radius: 26px 18px 30px 20px;
  border: 1px solid var(--faq-hair);
  background: linear-gradient(150deg, rgba(255, 138, 61, 0.1), rgba(18, 41, 63, 0.86) 68%);
}

.page-faq .faq-step__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--orange);
}

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

.page-faq .faq-step__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-faq .faq-step__body p {
  margin: 8px 0 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 章节配图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 18px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--faq-hair);
  background: var(--ink-2);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 13;
  object-fit: cover;
  filter: saturate(0.75) brightness(0.82);
}

.page-faq .faq-figure .media__caption {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 收口 ---------- */

.page-faq .faq-help {
  margin-top: clamp(12px, 3vw, 28px);
  padding: clamp(26px, 5vw, 44px) clamp(20px, 4vw, 40px);
  border-radius: 40px 26px 44px 28px;
  border: 1px solid rgba(47, 224, 138, 0.28);
  background: linear-gradient(140deg, rgba(47, 224, 138, 0.13), rgba(74, 61, 142, 0.16) 58%, rgba(18, 41, 63, 0.92));
}

.page-faq .faq-help__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 4.6vw, 32px);
  line-height: 1.18;
  color: var(--paper);
}

.page-faq .faq-help__text {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-faq .faq-help__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }

  .page-faq .faq-step {
    flex-direction: column;
    gap: 12px;
    padding: 22px 18px 20px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-faq .faq-index {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    margin: 0;
    background: none;
    backdrop-filter: none;
    border-left: 1px solid var(--faq-hair);
  }

  .page-faq .faq-index__label {
    display: block;
    margin: 0 0 14px -1px;
    padding-left: 16px;
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
  }

  .page-faq .faq-index__link {
    border: none;
    border-radius: 0;
    background: none;
    padding: 11px 16px;
    border-left: 2px solid transparent;
    margin-left: -1px;
    font-size: 14px;
    justify-content: flex-start;
  }

  .page-faq .faq-index__link:hover {
    background: none;
    border-left-color: var(--orange);
    color: var(--paper);
  }

  .page-faq .faq-index__link[aria-current="true"] {
    background: none;
    border-left-color: var(--green);
    color: var(--paper);
  }

  .page-faq .faq-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 68px);
  }

  .page-faq .faq-chapter .chapter__head {
    max-width: 40ch;
  }

  .page-faq .qa__q {
    font-size: 18px;
    padding: 18px 6px;
  }

  .page-faq .faq-figure {
    max-width: 620px;
  }
}

@media (min-width: 1140px) {
  .page-faq .faq-cats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-faq .faq-hero__lede {
    font-size: 18px;
  }
}