/* ============ 问题排查页 ============ */
.page-faq {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

.page-faq section[id] {
  scroll-margin-top: calc(var(--header-h) + 22px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(26px, 5vw, 58px)) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 92% at 86% 4%, rgba(34, 52, 79, .16), rgba(34, 52, 79, 0) 56%),
    linear-gradient(180deg, var(--paper-2), var(--paper));
}

.page-faq .faq-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .45;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 76%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 76%);
}

.page-faq .faq-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-faq .faq-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 52px);
  align-items: start;
}

.page-faq .faq-hero__kicker {
  margin: 0 0 14px;
  color: var(--red);
}

.page-faq .faq-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(2.6rem, 9vw, 5.4rem);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-faq .faq-hero__intro {
  max-width: 47ch;
  margin: 0 0 28px;
  font-size: clamp(1rem, 2.1vw, 1.1rem);
  line-height: 1.88;
  color: var(--ink-soft);
}

.page-faq .faq-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 30px;
  border: 1px solid var(--line);
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
}

.page-faq .faq-hero__metaItem {
  background: var(--paper);
  padding: 14px 16px;
}

.page-faq .faq-hero__metaItem dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-faq .faq-hero__metaItem dd {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--indigo);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-faq .faq-hero__fig .figure__media {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border: 1px solid var(--line-2);
  background: var(--paper-3);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-hero__fig .figure__media::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--red);
}

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

.page-faq .faq-hero__fig .figure__cap {
  margin-top: 12px;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 章节导航 ---------- */
.page-faq .watch-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 5;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.page-faq .watch-nav__list {
  display: flex;
  margin: 0;
  padding: 0 var(--gutter);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-faq .watch-nav__link {
  display: block;
  padding: 15px clamp(14px, 3vw, 26px);
  border-right: 1px solid var(--line);
  border-bottom: 2px solid transparent;
  font-size: .86rem;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--stone);
  text-decoration: none;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .watch-nav__link:first-child {
  border-left: 1px solid var(--line);
}

.page-faq .watch-nav__link:hover {
  color: var(--ink);
}

.page-faq .watch-nav__link.is-active,
.page-faq .watch-nav__link[aria-current="true"] {
  color: var(--red);
  font-weight: 700;
  border-bottom-color: var(--red);
}

/* ---------- 通用章节头 ---------- */
.page-faq .faq-sec {
  position: relative;
}

.page-faq .section__head {
  margin-bottom: clamp(26px, 4.5vw, 46px);
}

.page-faq .section__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-faq .section__head .mono-label {
  color: var(--red);
}

.page-faq .faq-sec__note {
  margin: 0;
  max-width: 44ch;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-faq .section__head--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  align-items: end;
}

/* ---------- 01 排查顺序 ---------- */
.page-faq .faq-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-2);
}

.page-faq .faq-step {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  gap: 18px;
  padding: clamp(20px, 3.4vw, 32px) 0;
  border-bottom: 1px solid var(--line);
  transition: background .4s var(--ease);
}

.page-faq .faq-step:hover {
  background: rgba(34, 52, 79, .035);
}

.page-faq .faq-step__num {
  padding-top: 3px;
  padding-right: 12px;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--red);
}

.page-faq .faq-step__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.4vw, 1.28rem);
  line-height: 1.35;
  color: var(--ink);
}

.page-faq .faq-step__body p {
  margin: 0;
  max-width: 64ch;
  font-size: .95rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-faq .faq-steps__fig {
  margin: clamp(32px, 5vw, 52px) 0 0;
}

.page-faq .faq-steps__fig .figure__media {
  overflow: hidden;
  border: 1px solid var(--line-2);
  background: var(--paper-3);
}

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

.page-faq .faq-steps__fig .figure__cap {
  margin-top: 12px;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 02 编号前缀 ---------- */
.page-faq .faq-tableWrap {
  overflow-x: auto;
  border: 1px solid var(--line-2);
  background: var(--paper);
  box-shadow: var(--shadow-1);
  -webkit-overflow-scrolling: touch;
}

.page-faq .faq-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: .92rem;
}

.page-faq .faq-table th,
.page-faq .faq-table td {
  padding: 16px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.page-faq .faq-table thead th {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
  background: var(--paper-2);
  border-bottom: 1px solid var(--line-2);
}

.page-faq .faq-table tbody tr:last-child th,
.page-faq .faq-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-faq .faq-table tbody tr:hover {
  background: rgba(34, 52, 79, .045);
}

.page-faq .faq-table__code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .08em;
  color: var(--red);
  white-space: nowrap;
}

.page-faq .faq-table a {
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

.page-faq .faq-table a:hover {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-faq .faq-tableNote {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin: 18px 0 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--stone);
}

.page-faq .faq-tableNote .tag {
  flex: 0 0 auto;
}

/* ---------- 03 常见情形 ---------- */
.page-faq .faq-cases {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.page-faq .faq-case {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px 26px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 2px solid var(--indigo);
  box-shadow: none;
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-top-color .4s var(--ease);
}

.page-faq .faq-case:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
  border-top-color: var(--red);
}

.page-faq .faq-case .card__index {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--stone-2);
}

.page-faq .faq-case .card__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 1.12rem;
  line-height: 1.35;
  color: var(--ink);
}

.page-faq .faq-case .card__body {
  margin: 0;
  font-size: .91rem;
  line-height: 1.88;
  color: var(--ink-soft);
}

/* ---------- 04 响应档位 ---------- */
.page-faq .faq-tiers {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-faq .faq-tier {
  padding: clamp(16px, 3vw, 22px) clamp(16px, 3vw, 24px);
  border-left: 4px solid var(--indigo);
  background: rgba(245, 240, 230, .72);
}

.page-faq .faq-tier--primary {
  border-left-color: var(--red);
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.page-faq .faq-tier__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 20px;
  margin: 0;
}

.page-faq .faq-tier__meta dt {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone-2);
}

.page-faq .faq-tier__meta dd {
  margin: 0;
  font-size: .94rem;
  line-height: 1.6;
  color: var(--ink);
}

.page-faq .faq-tier__code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .1em;
  color: var(--indigo);
}

.page-faq .faq-tier--primary .faq-tier__code {
  color: var(--red);
}

/* ---------- 05 提交与联络 ---------- */
.page-faq .faq-submit {
  background-image: linear-gradient(140deg, var(--indigo-deep) 0%, var(--ink) 72%);
  border-top: 3px solid var(--red);
}

.page-faq .faq-submit__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-faq .faq-submit .mono-label {
  color: var(--red-bright);
}

.page-faq .faq-submit h2 {
  margin: 10px 0 18px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-faq .faq-submit p {
  max-width: 54ch;
  font-size: .96rem;
  line-height: 1.9;
  color: rgba(245, 240, 230, .74);
}

.page-faq .faq-submit__panel {
  padding: clamp(20px, 3.4vw, 30px);
  border: 1px solid var(--line-paper);
  background: rgba(245, 240, 230, .05);
}

.page-faq .faq-submit__panel .ledger {
  margin: 0 0 4px;
}

.page-faq .faq-submit__note {
  margin: 18px 0 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line-paper);
  font-size: .84rem;
  line-height: 1.85;
  color: rgba(245, 240, 230, .6);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-hero__meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-faq .section__head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 330px);
    gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, .78fr);
    gap: clamp(40px, 6vw, 76px);
  }
}

@media (min-width: 940px) {
  .page-faq .faq-submit__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  }

  .page-faq .faq-tier__meta {
    grid-template-columns: 86px 150px minmax(0, 1fr) minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 1000px) {
  .page-faq .faq-cases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-faq .faq-hero__actions .btn {
    width: 100%;
    text-align: center;
  }

  .page-faq .faq-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-faq .faq-step__num {
    padding-right: 0;
    border-right: 0;
    border-left: 3px solid var(--red);
    padding-left: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-case,
  .page-faq .faq-step,
  .page-faq .watch-nav__link {
    transition: none;
  }

  .page-faq .faq-case:hover {
    transform: none;
  }
}