/* ===== 使用指南 / 问答流水线 ===== */

.page-faq {
  --faq-hair: rgba(13, 22, 32, 0.12);
  --faq-hair-soft: rgba(13, 22, 32, 0.08);
  --faq-body: rgba(13, 22, 32, 0.74);
  --faq-muted: rgba(13, 22, 32, 0.6);
  background: var(--deep);
  color: var(--cream);
  overflow-x: clip;
}

.page-faq img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(158deg, var(--deep) 0%, var(--deep-2) 100%);
  color: var(--cream);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(221, 230, 238, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(221, 230, 238, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(205deg, #000 0%, transparent 72%);
  mask-image: linear-gradient(205deg, #000 0%, transparent 72%);
  z-index: -1;
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -12%;
  right: 14%;
  width: 1px;
  height: 150%;
  background: linear-gradient(to bottom, transparent, rgba(255, 106, 31, 0.5) 45%, transparent);
  transform: rotate(7deg);
  transform-origin: top center;
  pointer-events: none;
  z-index: -1;
}

.page-faq .faq-hero__grid {
  position: relative;
  padding-top: clamp(40px, 8vw, 88px);
  padding-bottom: clamp(30px, 5vw, 56px);
}

.page-faq .faq-hero .breadcrumbs__link {
  color: var(--mist);
  opacity: 0.72;
  transition: color 0.28s var(--ease), opacity 0.28s var(--ease);
}

.page-faq .faq-hero .breadcrumbs__link:hover,
.page-faq .faq-hero .breadcrumbs__link:focus-visible {
  color: var(--cyan);
  opacity: 1;
}

.page-faq .faq-hero .breadcrumbs__current {
  color: var(--rock);
}

.page-faq .faq-hero .eyebrow {
  margin: clamp(24px, 4vw, 40px) 0 0;
  color: var(--orange-soft);
  letter-spacing: 0.22em;
  font-size: 12px;
}

.page-faq .faq-hero__title {
  margin: clamp(12px, 2vw, 20px) 0 0;
  max-width: 15ch;
  color: var(--cream);
}

.page-faq .faq-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 44ch;
  color: var(--mist);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
}

.page-faq .faq-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-jump__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 18px;
  border: 1px solid rgba(221, 230, 238, 0.22);
  border-radius: 999px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 0.32s var(--ease), color 0.32s var(--ease), background 0.32s var(--ease);
}

.page-faq .faq-jump__link:hover,
.page-faq .faq-jump__link:focus-visible {
  border-color: rgba(43, 227, 192, 0.6);
  color: var(--cream);
  background: rgba(43, 227, 192, 0.08);
}

.page-faq .faq-jump__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex: none;
}

.page-faq .faq-jump__dot--account { background: var(--orange); }
.page-faq .faq-jump__dot--schedule { background: var(--cyan); }
.page-faq .faq-jump__dot--device { background: var(--moss); }
.page-faq .faq-jump__dot--help { background: var(--clay); }

.page-faq .faq-hero__meta {
  margin: 20px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  line-height: 0;
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: clamp(160px, 26vw, 400px);
  object-fit: cover;
  object-position: center 58%;
}

/* ---------- 三步起步 ---------- */

.page-faq .faq-start {
  background: var(--cream);
  color: var(--ink);
  padding: clamp(48px, 7vw, 92px) 0 clamp(40px, 6vw, 72px);
}

.page-faq .faq-start__title {
  margin: 0;
  max-width: 20ch;
  color: var(--ink);
}

.page-faq .faq-start__lede {
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--faq-body);
}

.page-faq .step-list {
  display: grid;
  gap: 30px;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .step {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--orange);
}

.page-faq .step__no {
  display: block;
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-faq .step__title {
  margin: 16px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-faq .step__text {
  margin: 0;
  max-width: 36ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--faq-body);
}

/* ---------- 问答主体 ---------- */

.page-faq .faq-board {
  background: var(--cream);
  color: var(--ink);
  padding: clamp(48px, 7vw, 80px) 0 clamp(64px, 9vw, 120px);
}

.page-faq .faq-board__head {
  max-width: 60ch;
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-faq .faq-board__head .section-title {
  margin: 0;
  color: var(--ink);
}

.page-faq .faq-board__lede {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--faq-body);
}

.page-faq .faq-board__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-faq .faq-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  border: 1px solid var(--faq-hair);
  border-radius: 999px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: rgba(20, 69, 110, 0.45);
  background: rgba(20, 69, 110, 0.06);
}

.page-faq .faq-rail__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex: none;
}

.page-faq .faq-rail__dot--account { background: var(--orange); }
.page-faq .faq-rail__dot--schedule { background: var(--moss); }
.page-faq .faq-rail__dot--device { background: var(--clay); }
.page-faq .faq-rail__dot--help { background: var(--deep); }

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

.page-faq .faq-group {
  scroll-margin-top: calc(var(--header-space) + 24px);
  padding-top: clamp(24px, 3.6vw, 38px);
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 6.5vw, 78px);
}

.page-faq .faq-group__index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-faq .faq-group__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-faq .faq-group__note {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--faq-muted);
}

.page-faq .faq-group__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

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

.page-faq .faq-group__figure {
  margin: 0;
}

.page-faq .faq-group__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--faq-hair-soft);
}

.page-faq .faq-group__figure .media__caption {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--faq-muted);
}

/* ---------- 问答条目 ---------- */

.page-faq .faq-list {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .qa {
  position: relative;
  padding-left: 16px;
  border-top: 1px solid var(--faq-hair-soft);
}

.page-faq .qa::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  border-radius: 2px;
  background: var(--cyan);
  opacity: 0;
  transform: scaleY(0.35);
  transform-origin: top center;
  transition: opacity 0.34s var(--ease), transform 0.34s var(--ease);
}

.page-faq .qa[open]::before {
  opacity: 1;
  transform: scaleY(1);
}

.page-faq .qa__q {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 20px 6px 20px 0;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}

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

.page-faq .qa__no {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--clay);
  transform: translateY(-2px);
}

.page-faq .qa__text {
  margin: 0;
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.75vw, 19px);
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--ink);
  transition: color 0.3s var(--ease);
}

.page-faq .qa__q:hover .qa__text {
  color: var(--river);
}

.page-faq .qa__sign {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
  margin-left: auto;
  align-self: center;
}

.page-faq .qa__sign::before,
.page-faq .qa__sign::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  border-radius: 2px;
  background: var(--rock);
  transition: transform 0.32s var(--ease), background 0.32s var(--ease);
}

.page-faq .qa__sign::before {
  width: 14px;
  height: 1.5px;
}

.page-faq .qa__sign::after {
  width: 1.5px;
  height: 14px;
}

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

.page-faq .qa[open] .qa__sign::after {
  transform: scaleY(0);
}

.page-faq .qa__a {
  padding: 0 6px 24px 42px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--faq-body);
  overflow-wrap: break-word;
}

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

.page-faq .qa__a p + p {
  margin-top: 10px;
}

/* ---------- 人工帮助 ---------- */

.page-faq .faq-help {
  position: relative;
  background: linear-gradient(180deg, var(--deep) 0%, var(--deep-2) 100%);
  color: var(--cream);
  padding: clamp(52px, 7.5vw, 96px) 0;
}

.page-faq .faq-help .eyebrow {
  margin: 0;
  color: var(--cyan);
  letter-spacing: 0.22em;
  font-size: 12px;
}

.page-faq .faq-help__title {
  margin: 14px 0 0;
  max-width: 18ch;
  color: var(--cream);
}

.page-faq .faq-help__text {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-faq .faq-help__more {
  margin: 18px 0 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-faq .faq-help__more a {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 164, 92, 0.45);
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-faq .faq-help__more a:hover,
.page-faq .faq-help__more a:focus-visible {
  color: var(--cyan);
  border-color: rgba(43, 227, 192, 0.6);
}

.page-faq .faq-help__channels {
  margin: clamp(30px, 4vw, 44px) 0 0;
}

.page-faq .faq-channel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-top: var(--edge);
}

.page-faq .faq-channel:last-child {
  border-bottom: var(--edge);
}

.page-faq .faq-channel__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--rock);
}

.page-faq .faq-channel__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--cream);
  word-break: break-all;
}

.page-faq .faq-channel__value a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 192, 0.4);
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease);
}

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

.page-faq .faq-channel__value--text {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: normal;
  color: var(--mist);
  word-break: normal;
}

/* ---------- 焦点可见性 ---------- */

.page-faq a:focus-visible,
.page-faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 600px) {
  .page-faq .qa__a {
    padding-left: 26px;
  }

  .page-faq .faq-group__title {
    font-size: 24px;
  }
}

@media (min-width: 720px) {
  .page-faq .step-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(28px, 4vw, 48px);
  }

  .page-faq .faq-channel {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-faq .faq-board__inner {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-space) + 16px);
    align-self: start;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--faq-hair);
  }

  .page-faq .faq-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    padding: 12px 10px 12px 18px;
    white-space: normal;
    font-family: var(--font-display);
    font-size: 15px;
    color: var(--faq-muted);
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    color: var(--ink);
    background: rgba(20, 69, 110, 0.05);
    border-left-color: rgba(20, 69, 110, 0.35);
  }

  .page-faq .faq-help__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: start;
  }

  .page-faq .faq-help__channels {
    margin-top: 0;
  }
}

@media (min-width: 1120px) {
  .page-faq .faq-group__layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa::before,
  .page-faq .qa__sign::before,
  .page-faq .qa__sign::after,
  .page-faq .qa__text,
  .page-faq .faq-jump__link,
  .page-faq .faq-rail__link {
    transition: none;
  }
}