.page-faq {
  --faq-rail-w: 264px;
  --faq-gap: clamp(20px, 3.2vw, 40px);
  background: var(--bg);
  color: var(--graphite);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-faq .kb-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3vw, 32px) clamp(30px, 4.4vw, 52px);
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid var(--on-ink-line);
}

.page-faq .kb-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(227, 193, 90, .07) 0 1px, transparent 1px 64px);
  opacity: .8;
}

.page-faq .kb-hero::after {
  content: "";
  position: absolute;
  top: -140px;
  right: -160px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 162, 39, .18), transparent 68%);
  pointer-events: none;
}

.page-faq .kb-hero__inner {
  position: relative;
  z-index: 1;
}

.page-faq .kb-hero .breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-faq .kb-hero .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .04em;
}

.page-faq .kb-hero .breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(251, 252, 253, .5);
}

.page-faq .kb-hero .breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: rgba(251, 252, 253, .28);
}

.page-faq .kb-hero .breadcrumb__link {
  color: var(--on-ink-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-faq .kb-hero .breadcrumb__link:hover,
.page-faq .kb-hero .breadcrumb__link:focus-visible {
  color: var(--gold-bright);
}

.page-faq .kb-hero .eyebrow,
.page-faq .kb-block--ink .eyebrow,
.page-faq .kb-close__card--ink .eyebrow {
  color: var(--gold-bright);
}

.page-faq .kb-hero__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 34px);
}

.page-faq .kb-hero h1 {
  margin: 10px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: .015em;
  color: var(--paper);
}

.page-faq .kb-hero__lede {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--on-ink-text);
}

.page-faq .kb-search {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-faq .kb-search__field {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(251, 252, 253, .06);
  border: 1px solid var(--on-ink-line);
  border-left: 3px solid var(--gold);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .kb-search__field:focus-within {
  border-color: var(--gold);
  background: rgba(251, 252, 253, .1);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, .16);
}

.page-faq .kb-search__icon {
  position: relative;
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  border: 1.5px solid var(--gold);
  border-radius: 50%;
}

.page-faq .kb-search__icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 6px;
  height: 1.5px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-faq .kb-search__input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--step-1);
  line-height: 1.5;
  outline: none;
  appearance: none;
}

.page-faq .kb-search__input::placeholder {
  color: rgba(251, 252, 253, .45);
  font-size: var(--step-0);
}

.page-faq .kb-search__input::-webkit-search-cancel-button {
  appearance: none;
}

.page-faq .kb-search__note {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--on-ink-muted);
}

.page-faq .kb-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 40px);
  background: var(--on-ink-line);
  border: 1px solid var(--on-ink-line);
}

.page-faq .kb-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-faq .kb-hero__num {
  font-family: var(--font-mono);
  font-size: var(--step-3);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--gold-bright);
}

.page-faq .kb-hero__num small {
  margin-left: 1px;
  font-size: .55em;
}

.page-faq .kb-hero__unit {
  font-size: var(--step--1);
  line-height: 1.5;
  letter-spacing: .02em;
  color: var(--on-ink-muted);
}

/* ---------- 分类入口 ---------- */
.page-faq .kb-cats {
  padding-block: clamp(34px, 4.6vw, 60px);
}

.page-faq .kb-cats__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-cat {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 18px 18px 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .kb-cat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 3px;
  background: var(--gold);
  transition: width var(--dur) var(--ease);
}

.page-faq .kb-cat:hover,
.page-faq .kb-cat:focus-visible {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: 0 6px 18px rgba(10, 26, 42, .08);
}

.page-faq .kb-cat:hover::before,
.page-faq .kb-cat:focus-visible::before {
  width: 100%;
}

.page-faq .kb-cat:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-faq .kb-cat__idx {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .14em;
  color: var(--gold-deep);
}

.page-faq .kb-cat__name {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-faq .kb-cat__meta {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-faq .kb-cat__desc {
  margin-top: 4px;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 双栏布局 ---------- */
.page-faq .kb-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--faq-gap);
  align-items: start;
  padding-block: clamp(20px, 3vw, 32px) clamp(40px, 5vw, 72px);
}

.page-faq .kb-rail {
  order: 2;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-faq .kb-main {
  order: 1;
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  align-content: start;
}

.page-faq .kb-rail__block {
  padding: 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 2px solid var(--ink);
}

.page-faq .kb-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.page-faq .kb-rail__index {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-rail__index a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  border-bottom: 1px dashed var(--line);
  color: var(--graphite);
  font-size: var(--step-0);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .kb-rail__index a:hover,
.page-faq .kb-rail__index a:focus-visible {
  background: rgba(201, 162, 39, .08);
  color: var(--ink);
}

.page-faq .kb-rail__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--gold-deep);
}

.page-faq .kb-rail__label {
  flex: 1 1 auto;
}

.page-faq .kb-rail__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-faq .kb-rail__codes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-rail__codes li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 6px 0;
  border-bottom: 1px dotted var(--line);
  font-size: var(--step--1);
  line-height: 1.45;
  color: var(--graphite);
}

.page-faq .kb-rail__codes code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .03em;
  color: var(--gold-deep);
}

.page-faq .kb-rail__block--note {
  border-top-color: var(--amber);
  background: rgba(184, 107, 22, .06);
}

.page-faq .kb-rail__block--note p {
  margin: 0 0 12px;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 内容块通用 ---------- */
.page-faq .kb-block {
  scroll-margin-top: 96px;
}

.page-faq .kb-block__head {
  margin: 0 0 20px;
}

.page-faq .kb-block__head h2 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-faq .kb-block__head > p:not(.eyebrow) {
  margin: 10px 0 0;
  max-width: 66ch;
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .kb-figure {
  margin: 0 0 22px;
  padding: 10px;
  background: var(--paper);
  border: 1px solid var(--line);
}

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

.page-faq .kb-figure figcaption {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--graphite);
  opacity: .78;
}

/* ---------- 问题卡片 ---------- */
.page-faq .kb-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-2);
  transition: border-left-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-faq .kb-card:hover {
  border-left-color: var(--gold);
  box-shadow: 0 2px 10px rgba(10, 26, 42, .06);
}

.page-faq .kb-card summary {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  align-items: baseline;
  padding: 14px 42px 14px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-faq .kb-card summary::marker {
  content: "";
}

.page-faq .kb-card summary::after {
  content: "+";
  position: absolute;
  top: 12px;
  right: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--gold-deep);
  background: var(--bg);
  border: 1px solid var(--line);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .kb-card details[open] summary::after {
  content: "−";
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-faq .kb-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .kb-card__code {
  padding: 2px 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--gold-deep);
  background: rgba(201, 162, 39, .12);
  border: 1px solid rgba(201, 162, 39, .32);
}

.page-faq .kb-card__name {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-faq .kb-card__brief {
  grid-column: 1 / -1;
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--graphite);
}

.page-faq .kb-card__body {
  padding: 2px 14px 16px;
  border-top: 1px dashed var(--line);
  font-size: var(--step-0);
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .kb-card__body > p {
  margin: 12px 0 0;
}

.page-faq .kb-card__body ol {
  display: grid;
  gap: 6px;
  margin: 10px 0 0;
  padding-left: 18px;
}

.page-faq .kb-card__body li::marker {
  font-family: var(--font-mono);
  font-size: .85em;
  color: var(--gold-deep);
}

/* ---------- 深色诊断块 ---------- */
.page-faq .kb-block--ink {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.4vw, 38px);
  background: linear-gradient(150deg, var(--ink) 0%, var(--ink-2) 100%);
  border: 1px solid var(--on-ink-line);
  color: var(--on-ink-text);
}

.page-faq .kb-block--ink::after {
  content: "";
  position: absolute;
  right: -110px;
  bottom: -130px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 162, 39, .14), transparent 70%);
  pointer-events: none;
}

.page-faq .kb-block--ink > * {
  position: relative;
  z-index: 1;
}

.page-faq .kb-block--ink .kb-block__head h2 {
  color: var(--paper);
}

.page-faq .kb-block--ink .kb-block__head > p:not(.eyebrow) {
  color: var(--on-ink-text);
}

.page-faq .kb-figure--ink {
  background: rgba(251, 252, 253, .04);
  border-color: var(--on-ink-line);
}

.page-faq .kb-figure--ink figcaption {
  border-top-color: var(--on-ink-line);
  color: var(--on-ink-muted);
  opacity: 1;
}

.page-faq .kb-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--on-ink-line);
  border: 1px solid var(--on-ink-line);
}

.page-faq .kb-step {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--ink);
  transition: background var(--dur) var(--ease);
}

.page-faq .kb-step:hover {
  background: var(--ink-2);
}

.page-faq .kb-step__no {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--gold-bright);
}

.page-faq .kb-step__title {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-faq .kb-step__desc {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--on-ink-muted);
}

.page-faq .kb-note {
  margin: 18px 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--amber);
  background: rgba(184, 107, 22, .14);
  font-size: var(--step-0);
  line-height: 1.8;
  color: var(--on-ink-text);
}

/* ---------- 高频问题 ---------- */
.page-faq .kb-hot {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-faq .kb-hot li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}

.page-faq .kb-hot li:hover {
  background: rgba(201, 162, 39, .05);
}

.page-faq .kb-hot__code {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--gold-deep);
}

.page-faq .kb-hot__title {
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 环境对照表 ---------- */
.page-faq .kb-table-wrap {
  overflow-x: auto;
  background: var(--paper);
  border: 1px solid var(--line);
}

.page-faq .kb-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--step-0);
}

.page-faq .kb-table th,
.page-faq .kb-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

.page-faq .kb-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--gold-deep);
  background: var(--bg);
  border-bottom: 1px solid var(--line-strong);
}

.page-faq .kb-table tbody tr:nth-child(even) {
  background: rgba(238, 242, 244, .55);
}

.page-faq .kb-table tbody td:first-child {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.page-faq .kb-table code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .03em;
  color: var(--gold-deep);
}

.page-faq .kb-browsers {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.page-faq .kb-browsers__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .08em;
  color: var(--gold-deep);
}

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

.page-faq .kb-browsers li {
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--graphite);
  background: var(--paper);
  border: 1px solid var(--line);
}

/* ---------- 收束区 ---------- */
.page-faq .kb-close {
  padding-block: clamp(34px, 4.6vw, 64px);
}

.page-faq .kb-close__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-faq .kb-close__card {
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 3vw, 34px);
  background: var(--paper);
  border: 1px solid var(--line);
}

.page-faq .kb-close__card--ink {
  background: linear-gradient(140deg, var(--ink) 0%, var(--ink-2) 100%);
  border-color: var(--on-ink-line);
  color: var(--on-ink-text);
}

.page-faq .kb-close__card h2 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-faq .kb-close__card--ink h2 {
  color: var(--paper);
}

.page-faq .kb-close__card > p:not(.eyebrow) {
  margin: 12px 0 0;
  font-size: var(--step-0);
  line-height: 1.8;
  color: var(--graphite);
}

.page-faq .kb-close__card--ink > p:not(.eyebrow) {
  color: var(--on-ink-text);
}

.page-faq .kb-close__list {
  display: grid;
  gap: 8px;
  width: 100%;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-faq .kb-close__list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--step-0);
  line-height: 1.7;
  color: var(--on-ink-text);
}

.page-faq .kb-close__list li::before {
  content: "";
  position: absolute;
  top: .68em;
  left: 0;
  width: 9px;
  height: 1px;
  background: var(--gold);
}

.page-faq .kb-close__card .btn {
  align-self: flex-start;
  margin-top: 20px;
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-faq .kb-cats__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-faq .kb-hero h1 {
    font-size: var(--step-5);
  }

  .page-faq .kb-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-faq .kb-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .kb-hot li {
    display: grid;
    grid-template-columns: 136px minmax(0, 1fr) auto;
    align-items: center;
    gap: 16px;
    padding: 14px 12px;
  }
}

@media (min-width: 800px) {
  .page-faq .kb-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .kb-close__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-faq .kb-hero__top {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: end;
  }
}

@media (min-width: 1024px) {
  .page-faq .kb-layout {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
  }

  .page-faq .kb-rail {
    order: 0;
    position: sticky;
    top: 92px;
  }

  .page-faq .kb-main {
    order: 0;
  }
}

@media (min-width: 1080px) {
  .page-faq .kb-cats__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .kb-cat,
  .page-faq .kb-cat::before,
  .page-faq .kb-card,
  .page-faq .kb-step,
  .page-faq .kb-search__field {
    transition: none;
  }

  .page-faq .kb-cat:hover,
  .page-faq .kb-cat:focus-visible {
    transform: none;
  }
}