/* =========================================================
   FAQ / 问题解答 —— 快节奏自查工具页
   作用域：.page-faq
   ========================================================= */

.page-faq {
  --faq-line: var(--line-700);
  --faq-card: var(--ink-800);
  --faq-panel: var(--ink-900);
  position: relative;
  display: block;
}

.page-faq [hidden] {
  display: none !important;
}

.page-faq .mono {
  font-family: var(--mono);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 34px;
  background: var(--faq-panel);
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(39, 64, 92, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(39, 64, 92, 0.35) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.4;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 227, 220, 0.16) 0%, transparent 68%);
  pointer-events: none;
}

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

.page-faq .faq-hero__inner {
  display: grid;
  gap: 26px;
  margin-top: 18px;
}

.page-faq .faq-hero__coord {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-hero__title {
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}

.page-faq .faq-hero__lede {
  margin: 0;
  max-width: 34em;
  color: var(--body-text);
}

.page-faq .faq-hero__facts {
  margin: 0;
  display: grid;
  gap: 10px;
  padding: 16px 18px;
  border: 1px solid var(--faq-line);
  border-left: 2px solid var(--cyan-400);
  background: rgba(10, 20, 36, 0.55);
}

.page-faq .faq-hero__fact {
  display: grid;
  gap: 3px;
}

.page-faq .faq-hero__fact dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-faq .faq-hero__fact dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--body-text);
}

/* ---------- 现象选择器（分段控件） ---------- */

.page-faq .faq-picker {
  margin-top: 28px;
}

.page-faq .faq-picker__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-faq .faq-picker .tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: var(--faq-card);
  color: var(--body-text);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease);
}

.page-faq .faq-picker .tab:hover {
  border-color: var(--cyan-650);
  color: var(--paper-050);
}

.page-faq .faq-picker .tab[aria-selected="true"] {
  border-color: var(--cyan-400);
  background: rgba(59, 227, 220, 0.1);
  color: var(--paper-050);
  box-shadow: inset 0 -2px 0 var(--cyan-400);
}

.page-faq .tab__idx {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
}

.page-faq .faq-picker__panel {
  margin-top: 14px;
  padding: 18px 18px 20px;
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--cyan-400);
  background: var(--faq-card);
}

.page-faq .faq-picker__panel p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-faq .faq-jump {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  color: var(--cyan-400);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 227, 220, 0.4);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-faq .faq-jump:hover {
  color: var(--paper-050);
  border-bottom-color: var(--paper-050);
}

/* ---------- 解答区块 ---------- */

.page-faq .faq-block {
  position: relative;
  padding: 40px 0;
  border-bottom: 1px solid var(--faq-line);
}

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

.page-faq .faq-block__head {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan-400);
}

.page-faq .faq-block__num {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan-400);
}

.page-faq .faq-block__title {
  margin: 0;
  font-family: var(--sans);
  font-size: clamp(22px, 4.4vw, 32px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--paper-050);
}

.page-faq .faq-block__note {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mute-400);
}

.page-faq .faq-block__foot {
  margin: 22px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--body-text);
}

.page-faq .faq-block__foot a,
.page-faq .faq-contact__note a,
.page-faq .faq-contact__hint a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 227, 220, 0.4);
}

.page-faq .faq-block__foot a:hover,
.page-faq .faq-contact__note a:hover,
.page-faq .faq-contact__hint a:hover {
  color: var(--paper-050);
  border-bottom-color: var(--paper-050);
}

/* ---------- 步骤卡 ---------- */

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

.page-faq .faq-step {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 16px 15px 14px;
  border: 1px solid var(--faq-line);
  border-left: 2px solid var(--cyan-650);
  border-radius: var(--radius);
  background: var(--faq-card);
}

.page-faq .faq-step--alert {
  border-left-color: var(--amber-500);
}

.page-faq .faq-step__num {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
  padding-top: 3px;
}

.page-faq .faq-step--alert .faq-step__num {
  color: var(--amber-300);
}

.page-faq .faq-step__body {
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-faq .faq-step__title {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper-050);
}

.page-faq .faq-step__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--body-text);
}

.page-faq .faq-step__body .tag {
  justify-self: start;
  margin-top: 2px;
}

.page-faq .faq-steps--dense .faq-step {
  grid-template-columns: 36px minmax(0, 1fr);
  padding: 12px 14px;
}

.page-faq .faq-steps--dense .faq-step__body p {
  font-size: 14px;
}

/* ---------- 图片 ---------- */

.page-faq .faq-figure {
  margin: 0 0 24px;
}

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

.page-faq .faq-figure__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--faq-line);
  background: var(--faq-card);
}

.page-faq .faq-figure__frame--tall {
  aspect-ratio: 9 / 11;
}

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

.page-faq .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mute-400);
}

/* ---------- 分区 ---------- */

.page-faq .faq-split {
  display: grid;
  gap: 26px;
}

/* ---------- 现象分类选项卡（第二组） ---------- */

.page-faq .faq-cases__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-faq .faq-cases .tab {
  flex: 0 0 auto;
  padding: 8px 13px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--mute-400);
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-faq .faq-cases .tab:hover {
  color: var(--paper-050);
  border-color: var(--cyan-650);
}

.page-faq .faq-cases .tab[aria-selected="true"] {
  color: var(--paper-050);
  border-color: var(--cyan-400);
  background: rgba(59, 227, 220, 0.1);
}

.page-faq .faq-cases__panel {
  margin-top: 16px;
}

/* ---------- 折叠说明 ---------- */

.page-faq .faq-fold {
  margin-top: 16px;
  border: 1px solid var(--faq-line);
  border-radius: var(--radius);
  background: rgba(10, 20, 36, 0.4);
}

.page-faq .faq-fold .fold__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--paper-050);
  cursor: pointer;
  list-style: none;
}

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

.page-faq .faq-fold .fold__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
  border: 1px solid var(--cyan-400);
  border-radius: var(--radius);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}

.page-faq .faq-fold[open] .fold__idx {
  background: var(--cyan-400);
  color: var(--ink-950);
}

.page-faq .faq-fold .fold__body {
  padding: 0 15px 15px 47px;
}

.page-faq .faq-fold .fold__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--body-text);
}

/* ---------- 侧栏 ---------- */

.page-faq .faq-aside {
  margin-top: 20px;
  padding: 16px 17px;
  border: 1px solid var(--faq-line);
  border-top: 2px solid var(--amber-500);
  background: var(--faq-card);
}

.page-faq .faq-aside__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-300);
}

.page-faq .faq-aside p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--body-text);
}

/* ---------- 三列路径 ---------- */

.page-faq .faq-triple {
  display: grid;
  gap: 12px;
}

.page-faq .faq-triple__item {
  padding: 18px 17px;
  border: 1px solid var(--faq-line);
  background: var(--faq-card);
}

.page-faq .faq-triple__num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan-400);
}

.page-faq .faq-triple__title {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-050);
}

.page-faq .faq-triple__item p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-text);
}

/* ---------- 联系区块 ---------- */

.page-faq .faq-contact {
  display: grid;
  gap: 24px;
}

.page-faq .faq-contact__main .h3 {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-050);
}

.page-faq .faq-contact__list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-faq .faq-contact__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--body-text);
}

.page-faq .faq-contact__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 2px;
  background: var(--cyan-400);
}

.page-faq .faq-contact__note {
  margin: 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mute-400);
}

.page-faq .faq-contact__side {
  padding: 20px 18px;
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--cyan-400);
  background: var(--faq-card);
}

.page-faq .faq-contact__label {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute-400);
}

.page-faq .faq-contact__label:not(:first-child) {
  margin-top: 18px;
}

.page-faq .faq-contact__value {
  margin: 0 0 10px;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper-050);
  word-break: break-all;
}

.page-faq .faq-contact .copy-btn {
  margin-bottom: 6px;
}

.page-faq .faq-contact .copy-state {
  display: inline-block;
  margin-left: 8px;
  font-size: 12px;
  color: var(--mute-400);
}

.page-faq .faq-contact .copy-state[data-state="ok"] {
  color: var(--amber-300);
}

.page-faq .faq-contact__hint {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mute-400);
}

/* =========================================================
   响应式
   ========================================================= */

@media (min-width: 680px) {
  .page-faq .faq-hero {
    padding: 44px 0 50px;
  }

  .page-faq .faq-block {
    padding: 56px 0;
  }

  .page-faq .faq-steps--two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .page-faq .faq-triple {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 44px;
  }

  .page-faq .faq-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 32px;
    align-items: start;
  }

  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-faq .faq-picker__panel {
    padding: 22px 24px 24px;
  }
}

@media (min-width: 1100px) {
  .page-faq .faq-block__head {
    padding-left: 20px;
  }

  .page-faq .faq-hero__facts {
    padding: 20px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-picker .tab,
  .page-faq .faq-cases .tab,
  .page-faq .faq-jump {
    transition: none;
  }
}