.page-faq {
  --faq-hair: rgba(139, 150, 148, 0.42);
  --faq-shadow: rgba(11, 21, 23, 0.12);
}

/* 首屏 */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 8px 0 36px;
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(168deg, var(--mist) 0%, var(--mist) 54%, var(--paper) 54.4%, var(--paper) 100%);
  z-index: 0;
}

.page-faq .faq-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
  padding-top: 18px;
}

.page-faq .faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 8vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 14px;
}

.page-faq .faq-hero .lede {
  margin: 0;
  max-width: 46ch;
  color: var(--ink);
  opacity: 0.86;
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

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

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: 7px 7px 0 var(--faq-shadow);
  background: var(--mist);
}

/* 侧边索引 + 内容 */
.page-faq .faq-layout {
  display: grid;
  gap: 8px;
  padding-top: 34px;
  padding-bottom: 64px;
}

.page-faq .faq-index {
  padding: 0 0 6px;
  border-bottom: 1px solid var(--faq-hair);
  margin-bottom: 10px;
}

.page-faq .faq-index__title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-faq .faq-index__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}

.page-faq .faq-index__list .section-nav__link {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--deep-teal);
  text-decoration: none;
  border: 1px solid var(--faq-hair);
  border-radius: 4px;
  background: var(--paper);
}

.page-faq .faq-index__list .section-nav__link:hover,
.page-faq .faq-index__list .section-nav__link:focus-visible {
  border-color: var(--deep-teal);
  outline: none;
}

.page-faq .faq-index__list .section-nav__link[aria-current="location"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--neon);
}

/* 章节通用 */
.page-faq .faq-section {
  padding: 34px 0;
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-section:first-child {
  border-top: 0;
  padding-top: 12px;
}

.page-faq .faq-section .section__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 5.4vw, 2.35rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 6px 0 10px;
}

.page-faq .faq-section .section__head .lede {
  margin: 0 0 22px;
  max-width: 52ch;
  color: var(--ink);
  opacity: 0.82;
}

.page-faq .faq-note {
  margin: 20px 0 0;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--mist);
  border-left: 3px solid var(--deep-teal);
  border-radius: 0 4px 4px 0;
}

/* 三步 */
.page-faq .faq-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid var(--faq-hair);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 var(--faq-shadow);
}

.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--deep-teal);
  letter-spacing: -0.03em;
}

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

.page-faq .faq-step__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-faq .faq-step__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  opacity: 0.86;
}

/* 设备对照 */
.page-faq .faq-devices {
  display: grid;
  gap: 14px;
}

.page-faq .faq-device {
  padding: 18px 16px 20px;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
}

.page-faq .faq-device--alt {
  background: var(--ink);
  color: var(--mist);
}

.page-faq .faq-device__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 9px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--deep-teal);
  border: 2px solid currentColor;
  border-radius: 3px;
}

.page-faq .faq-device--alt .faq-device__tag {
  color: var(--neon);
}

.page-faq .faq-device__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.01em;
}

.page-faq .faq-device p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  opacity: 0.88;
}

.page-faq .faq-device__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-faq .faq-device__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  opacity: 0.9;
}

.page-faq .faq-device__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--hot);
  border-radius: 1px;
}

.page-faq .faq-device--alt .faq-device__list li::before {
  background: var(--neon);
}

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

.page-faq .faq-device-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--faq-hair);
  background: linear-gradient(140deg, var(--observe), var(--ink));
}

.page-faq .faq-gesture {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  margin-top: 16px;
  padding: 12px 14px;
  color: var(--deep-teal);
  border: 1px dashed var(--rock);
  border-radius: var(--radius);
  background: var(--mist);
}

.page-faq .faq-gesture svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-faq .faq-gesture p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
  opacity: 0.86;
}

/* 颜色图例 */
.page-faq .faq-section--ink {
  background: var(--ink);
  color: var(--mist);
  border-top: 0;
  margin: 0 -16px;
  padding: 34px 16px;
}

.page-faq .faq-section--ink .section__head h2 {
  color: var(--paper);
}

.page-faq .faq-section--ink .section__head .lede,
.page-faq .faq-section--ink .kicker {
  color: var(--cold);
  opacity: 1;
}

.page-faq .faq-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-legend__item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 14px 16px;
  background: rgba(248, 244, 234, 0.06);
  border: 1px solid rgba(175, 195, 207, 0.28);
  border-radius: var(--radius);
}

.page-faq .faq-legend__swatch {
  width: 14px;
  height: 14px;
  margin-top: 4px;
  border-radius: 2px;
  display: block;
}

.page-faq .faq-legend__swatch--amber {
  background: var(--amber);
}

.page-faq .faq-legend__swatch--cold {
  background: var(--cold);
}

.page-faq .faq-legend__swatch--observe {
  background: var(--observe);
}

.page-faq .faq-legend__swatch--hot {
  background: var(--hot);
}

.page-faq .faq-legend__name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-faq .faq-legend__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--cold);
}

.page-faq .faq-note--ink {
  margin-top: 18px;
  background: rgba(175, 195, 207, 0.12);
  border-left-color: var(--neon);
  color: var(--cold);
}

/* 更新节奏时间轴 */
.page-faq .faq-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .timeline__item {
  position: relative;
  margin-left: 6px;
  padding: 0 0 20px 22px;
  border-left: 2px solid var(--faq-hair);
}

.page-faq .timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-faq .timeline__marker {
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--neon);
  border: 2px solid var(--ink);
}

.page-faq .timeline__label {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--deep-teal);
}

.page-faq .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  opacity: 0.86;
}

/* 问答手风琴 */
.page-faq .faq-questions {
  border-top: 1px solid var(--faq-hair);
}

.page-faq .faq-q {
  border-bottom: 1px solid var(--faq-hair);
}

.page-faq .faq-q summary {
  position: relative;
  display: block;
  padding: 16px 40px 16px 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-q summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 700;
  color: var(--deep-teal);
}

.page-faq .faq-q[open] summary::after {
  content: "−";
}

.page-faq .faq-q summary:hover,
.page-faq .faq-q summary:focus-visible {
  color: var(--deep-teal);
  outline: none;
}

.page-faq .faq-q__body {
  padding: 0 8px 18px 0;
}

.page-faq .faq-q__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
  opacity: 0.84;
}

.page-faq .faq-q__body a {
  color: var(--deep-teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 联系区块 */
.page-faq .faq-help {
  border-top: 0;
  padding-top: 8px;
}

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

.page-faq .faq-help__item {
  padding: 14px 16px;
  background: var(--paper);
  border: 1px solid var(--faq-hair);
  border-left: 4px solid var(--hot);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-faq .faq-help__label {
  margin: 0 0 4px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-faq .faq-help__value {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-faq .faq-help__more {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  opacity: 0.86;
}

.page-faq .faq-help__more a {
  color: var(--deep-teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 桌面端 */
@media (min-width: 720px) {
  .page-faq .faq-devices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-faq .faq-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-faq .faq-step {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 1fr;
  }

  .page-faq .faq-step__num {
    font-size: 40px;
  }

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

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

@media (min-width: 900px) {
  .page-faq .faq-hero {
    padding: 18px 0 56px;
  }

  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 44px;
    padding-top: 26px;
  }

  .page-faq .faq-section--ink {
    margin: 0;
    padding: 40px 32px;
    border-radius: var(--radius);
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 52px;
    padding-top: 46px;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 88px;
    align-self: start;
    border-bottom: 0;
    margin-bottom: 0;
    padding-bottom: 0;
  }

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

  .page-faq .faq-index__list .section-nav__link {
    border: 0;
    border-radius: 0 4px 4px 0;
    background: transparent;
    padding: 9px 12px;
    margin-left: -2px;
    border-left: 2px solid transparent;
  }

  .page-faq .faq-index__list .section-nav__link[aria-current="location"] {
    background: transparent;
    color: var(--ink);
    border-left-color: var(--hot);
    font-weight: 700;
  }

  .page-faq .faq-section .section__head .lede {
    font-size: 17px;
  }

  .page-faq .faq-gesture {
    grid-template-columns: 120px minmax(0, 1fr);
  }
}
</