/* ===== 问答中心 · 页面专属样式（作用域 .page-faq） ===== */
.page-faq {
  --faq-index-w: 264px;
  --faq-gutter: 64px;
  --faq-fold-tint: rgba(63, 224, 207, 0.34);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  padding: clamp(32px, 5.5vw, 68px) 0 clamp(28px, 4.5vw, 52px);
}

.page-faq .faq-hero__grid {
  display: grid;
  gap: 36px;
}

@media (min-width: 960px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
    gap: var(--faq-gutter);
    align-items: end;
  }
}

.page-faq .faq-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--c-ink);
  margin: 16px 0 0;
  max-width: 15ch;
}

.page-faq .faq-hero__intro {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-faq .faq-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-hero__visual {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
  padding: 22px 22px 20px;
}

.page-faq .faq-hero__visual-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--c-ink-soft);
}

/* 温度色阶（三档保修） */
.page-faq .faq-temp {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 3px;
  margin: 14px 0 0;
  border-radius: 14px;
  overflow: hidden;
}

.page-faq .faq-temp__step {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 12px 14px;
  color: #05070f;
}

.page-faq .faq-temp__step--cold { background: var(--warm-cold); }
.page-faq .faq-temp__step--warm { background: var(--warm-mid); }
.page-faq .faq-temp__step--hot { background: var(--warm-hot); }

.page-faq .faq-temp__years {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-faq .faq-temp__unit {
  font-size: 12px;
  font-weight: 500;
  margin-left: 3px;
}

.page-faq .faq-temp__label {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-faq .faq-temp__hint {
  font-size: 11.5px;
  line-height: 1.4;
  opacity: 0.72;
}

/* ---------- 首屏下方信息图 ---------- */
.page-faq .faq-figure-section {
  padding: 0 0 clamp(40px, 6vw, 76px);
}

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

.page-faq .faq-figure .media-frame {
  border-radius: var(--radius-card);
  border: 1px solid var(--c-line);
  overflow: hidden;
  background: var(--c-panel);
}

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

.page-faq .faq-figure .media-frame__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-ink-soft);
}

.page-faq .faq-figure--inline {
  margin-top: 26px;
}

/* ---------- 主体：索引 + 问答 ---------- */
.page-faq .faq-body {
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-faq .faq-layout {
  display: grid;
  gap: 34px;
}

@media (min-width: 1020px) {
  .page-faq .faq-layout {
    grid-template-columns: var(--faq-index-w) minmax(0, 1fr);
    gap: var(--faq-gutter);
    align-items: start;
  }
}

/* 问题索引 */
.page-faq .faq-index {
  padding-top: 2px;
}

@media (min-width: 1020px) {
  .page-faq .faq-index {
    position: sticky;
    top: calc(var(--bar-h) + 30px);
    border-left: 1px solid var(--c-line);
    padding-left: 20px;
  }
}

.page-faq .faq-index__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

@media (max-width: 1019px) {
  .page-faq .faq-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-faq .faq-index__list {
    grid-template-columns: 1fr;
  }
}

.page-faq .faq-index__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.45;
  color: var(--c-ink-soft);
  text-decoration: none;
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-faq .faq-index__link::before {
  content: "";
  display: none;
  position: absolute;
  left: -21px;
  top: 7px;
  bottom: 7px;
  width: 2px;
  border-radius: 2px;
  background: var(--c-cyan);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform 200ms var(--ease);
}

@media (min-width: 1020px) {
  .page-faq .faq-index__link::before {
    display: block;
  }
}

.page-faq .faq-index__link:hover,
.page-faq .faq-index__link:focus-visible {
  color: var(--c-ink);
  background: var(--c-panel-soft);
}

@media (min-width: 1020px) {
  .page-faq .faq-index__link:hover::before,
  .page-faq .faq-index__link:focus-visible::before {
    transform: scaleY(1);
  }
}

.page-faq .faq-index__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-faq .faq-index__note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-ink-soft);
}

/* 分组 */
.page-faq .faq-group + .faq-group {
  margin-top: clamp(52px, 7vw, 88px);
}

.page-faq .faq-group + .faq-group::before {
  content: "";
  display: block;
  width: 96px;
  height: 1px;
  margin-bottom: clamp(30px, 4vw, 46px);
  background: linear-gradient(90deg, var(--c-cyan), transparent);
  transform: rotate(-2.2deg);
  transform-origin: left center;
}

.page-faq .faq-group__head {
  margin-bottom: 28px;
}

.page-faq .faq-group__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(25px, 3.6vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-ink);
  margin: 10px 0 0;
}

.page-faq .faq-group__note {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-ink-soft);
}

/* 折叠面板 */
.page-faq .fold {
  position: relative;
  margin-bottom: 10px;
  background: var(--c-panel-soft);
  border: 1px solid var(--c-line);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

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

.page-faq .fold:hover {
  border-color: var(--faq-fold-tint);
  box-shadow: 0 0 0 1px rgba(63, 224, 207, 0.06), 0 18px 40px -30px rgba(63, 224, 207, 0.55);
}

.page-faq .fold[open] {
  background: var(--c-panel);
  border-color: var(--faq-fold-tint);
  box-shadow: inset 3px 0 0 var(--c-cyan);
}

.page-faq .fold__summary {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 22px;
  align-items: start;
  gap: 12px;
  padding: 17px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--c-ink);
  font-size: 15.5px;
  line-height: 1.55;
  -webkit-tap-highlight-color: transparent;
}

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

.page-faq .fold__summary::marker {
  content: "";
}

.page-faq .fold__summary::after {
  content: "+";
  display: block;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  text-align: center;
  color: var(--c-ink-soft);
  transition: color 180ms var(--ease);
}

.page-faq .fold[open] .fold__summary::after {
  content: "−";
  color: var(--c-cyan);
}

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

.page-faq .fold__index {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--c-ink-soft);
  transition: color 180ms var(--ease);
}

.page-faq .fold[open] .fold__index {
  color: var(--c-cyan);
}

.page-faq .faq-fold__q {
  font-weight: 500;
}

.page-faq .fold__body {
  padding: 2px 34px 20px 74px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-ink-soft);
}

.page-faq .fold__body p {
  margin: 0 0 10px;
}

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

.page-faq .fold__body a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-faq .fold__body .num {
  color: var(--c-ink);
}

@media (max-width: 640px) {
  .page-faq .fold__summary {
    grid-template-columns: 32px minmax(0, 1fr) 18px;
    gap: 10px;
    padding: 15px 14px;
    font-size: 15px;
  }

  .page-faq .fold__body {
    padding: 0 16px 18px;
    font-size: 14.5px;
  }
}

/* 价格档位色带 */
.page-faq .faq-band {
  margin: 0 0 26px;
}

.page-faq .faq-band .band-price {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 3px;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
}

.page-faq .faq-band .band-price__seg {
  display: block;
  height: 100%;
}

.page-faq .faq-band .band-price__seg--1 { background: var(--tier-1); }
.page-faq .faq-band .band-price__seg--2 { background: var(--tier-2); }
.page-faq .faq-band .band-price__seg--3 { background: var(--tier-3); }
.page-faq .faq-band .band-price__seg--4 { background: var(--tier-4); }

.page-faq .faq-band__labels {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .faq-band__labels li {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--c-ink-soft);
}

.page-faq .faq-band__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.page-faq .faq-band__dot--1 { background: var(--tier-1); }
.page-faq .faq-band__dot--2 { background: var(--tier-2); }
.page-faq .faq-band__dot--3 { background: var(--tier-3); }
.page-faq .faq-band__dot--4 { background: var(--tier-4); }

@media (max-width: 640px) {
  .page-faq .faq-band__labels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 每月节奏读条 */
.page-faq .faq-cycle {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-faq .faq-cycle {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-faq .faq-cycle__item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--c-line);
  border-radius: 16px;
  background: var(--c-panel-soft);
}

.page-faq .faq-cycle__mark {
  grid-row: 1 / span 2;
  width: 8px;
  height: 8px;
  margin-top: 6px;
  border-radius: 50%;
}

.page-faq .faq-cycle__mark--snap { background: var(--c-cyan); }
.page-faq .faq-cycle__mark--window { background: var(--c-orange); }
.page-faq .faq-cycle__mark--update {
  background: transparent;
  border: 1.5px solid var(--c-cyan);
}

.page-faq .faq-cycle__label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-ink);
}

.page-faq .faq-cycle__desc {
  font-size: 13px;
  line-height: 1.62;
  color: var(--c-ink-soft);
}

/* ---------- 收尾 ---------- */
.page-faq .faq-closing {
  padding: 0 0 clamp(56px, 8vw, 96px);
}

.page-faq .faq-closing__panel {
  border: 1px solid var(--c-line);
  border-radius: var(--radius-card);
  background: linear-gradient(158deg, rgba(63, 224, 207, 0.07), rgba(5, 7, 15, 0) 58%), var(--c-panel);
  padding: clamp(24px, 4vw, 42px);
}

.page-faq .faq-closing__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.15;
  color: var(--c-ink);
  margin: 10px 0 0;
}

.page-faq .faq-closing__panel p {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-ink-soft);
}

.page-faq .faq-closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 动效兼容 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-index__link,
  .page-faq .faq-index__link::before,
  .page-faq .fold,
  .page-faq .fold__summary::after,
  .page-faq .fold__index {
    transition: none;
  }

  .page-faq .faq-group + .faq-group::before {
    transform: none;
  }
}