.page-faq {
  --faq-rule: rgba(8, 28, 23, 0.14);
  --faq-rule-soft: rgba(8, 28, 23, 0.07);
  --faq-cut: 22px;
  padding-top: calc(var(--bar-h) + 26px);
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

.page-faq .container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-inline: clamp(16px, 4vw, 40px);
  box-sizing: border-box;
}

.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-faq .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-700);
  margin: 0 0 10px;
}

/* ---------- 首屏 ---------- */
.faq-hero {
  padding-bottom: clamp(40px, 7vw, 72px);
}

.faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(34px, 7.4vw, 64px);
  line-height: 1.02;
  letter-spacing: 0.005em;
  margin: 0 0 18px;
  color: var(--ink-900);
}

.faq-hero .lead {
  font-size: clamp(15px, 2.1vw, 18px);
  line-height: 1.75;
  color: var(--ink-700);
  max-width: 46ch;
  margin: 0;
}

.faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: clamp(22px, 4vw, 32px);
}

.faq-jump {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-900);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-jump:hover,
.faq-jump:focus-visible {
  color: var(--ink-700);
  border-color: var(--ink-700);
}

.faq-jump__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-700);
}

/* 图例面板 */
.faq-legend {
  background: var(--ink-900);
  color: var(--white);
  padding: clamp(20px, 3.4vw, 30px);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.faq-legend__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-200);
  margin: 0 0 14px;
}

.faq-legend__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--line-dark);
}

.faq-legend__list li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 2px 10px;
  padding: 11px 0;
  border-top: 1px solid var(--line-dark);
}

.faq-legend__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}

.faq-legend__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--white);
}

.faq-legend__desc {
  grid-column: 2;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(252, 251, 247, 0.72);
}

.faq-legend__foot {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--amber-400);
}

.faq-legend__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(46, 230, 197, 0.16);
}

/* ---------- 通用章节 ---------- */
.faq-section {
  padding: clamp(44px, 8vw, 88px) 0;
  border-top: 1px solid var(--faq-rule);
}

.faq-section--alt {
  background: var(--paper-200);
}

.faq-head {
  max-width: 62ch;
}

.faq-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.08;
  margin: 0 0 14px;
}

.faq-head__lead {
  margin: 0;
  color: var(--ink-700);
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.75;
}

/* 首图 */
.faq-figure {
  margin: clamp(22px, 4vw, 34px) 0 clamp(26px, 4vw, 40px);
}

.faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.faq-figure__cap {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--gray-500);
}

/* ---------- 步骤卡片 ---------- */
.faq-cards {
  display: grid;
  gap: clamp(16px, 2.6vw, 22px);
}

.faq-card {
  display: grid;
  gap: 18px;
  background: var(--white);
  border: 1px solid var(--faq-rule);
  padding: clamp(18px, 3vw, 26px);
}

.faq-card__device {
  display: grid;
  place-items: center;
  padding: 18px;
  background: var(--ink-900);
  color: var(--cyan-200);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.faq-card__device svg {
  display: block;
  width: 66px;
  height: auto;
  max-width: 100%;
}

.faq-card__idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-700);
}

.faq-card h3 {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 25px);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 14px;
}

.faq-card__steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0;
  padding: 0;
}

.faq-card__steps li {
  position: relative;
  counter-increment: faqstep;
  padding-left: 38px;
  padding-bottom: 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-800);
}

.faq-card__steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--amber-400);
}

.faq-card__steps li::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 22px;
  bottom: 2px;
  width: 1px;
  background: var(--faq-rule);
}

.faq-card__steps li:last-child {
  padding-bottom: 0;
}

.faq-card__steps li:last-child::after {
  display: none;
}

/* 对照表 */
.faq-table__wrap {
  margin-top: clamp(24px, 4vw, 36px);
  overflow-x: auto;
}

.faq-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--white);
}

.faq-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-700);
}

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

.faq-table thead th {
  background: var(--ink-900);
  color: var(--white);
  font-weight: 500;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.03em;
}

.faq-table tbody tr:nth-child(even) {
  background: var(--paper-200);
}

/* ---------- 手风琴 ---------- */
.faq-acc {
  margin-top: clamp(22px, 4vw, 34px);
  border-bottom: 1px solid var(--faq-rule);
}

.faq-acc__item {
  border-top: 1px solid var(--faq-rule);
}

.faq-acc__item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.faq-acc__q {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--ink-900);
}

.faq-acc__sign {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin-top: 4px;
  border: 1px solid var(--ink-700);
}

.faq-acc__sign::before,
.faq-acc__sign::after {
  content: "";
  position: absolute;
  background: var(--ink-700);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.faq-acc__sign::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
  margin-top: -0.5px;
}

.faq-acc__sign::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 1px;
  margin-left: -0.5px;
}

.faq-acc__item[open] .faq-acc__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.faq-acc__body {
  padding: 0 0 20px;
}

.faq-acc__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 数据与订阅双栏 ---------- */
.faq-panels {
  display: grid;
  gap: clamp(16px, 2.6vw, 22px);
  margin-top: clamp(22px, 4vw, 34px);
}

.faq-panel {
  padding: clamp(20px, 3.4vw, 30px);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.faq-panel--dark {
  background: var(--ink-900);
  color: var(--white);
}

.faq-panel--amber {
  background: var(--amber-100);
  color: var(--ink-900);
  clip-path: polygon(0 var(--faq-cut), var(--faq-cut) 0, 100% 0, 100% 100%, 0 100%);
}

.faq-panel__tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.faq-panel--dark .faq-panel__tag {
  color: var(--cyan-400);
}

.faq-panel--amber .faq-panel__tag {
  color: var(--ink-700);
}

.faq-panel h3 {
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 26px);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 16px;
}

.faq-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-panel__list li {
  padding: 11px 0;
  border-top: 1px solid var(--faq-rule);
  font-size: 14.5px;
  line-height: 1.65;
}

.faq-panel--dark .faq-panel__list li {
  border-top-color: var(--line-dark);
  color: rgba(252, 251, 247, 0.86);
}

.faq-panel__key {
  display: inline-block;
  min-width: 62px;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--amber-400);
}

.faq-panel--amber .faq-panel__key {
  color: var(--ink-700);
}

.faq-panel__note {
  margin: 14px 0 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--gray-500);
}

.faq-panel--dark .faq-panel__note {
  color: rgba(252, 251, 247, 0.66);
}

.faq-panel__cta {
  align-self: flex-start;
}

/* ---------- 联系支持前准备 ---------- */
.faq-prep {
  display: grid;
  gap: clamp(22px, 3.4vw, 32px);
  margin-top: clamp(22px, 4vw, 34px);
}

.faq-prep__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-prep__list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--faq-rule);
}

.faq-prep__list li:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.faq-prep__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber-400);
  padding-top: 2px;
}

.faq-prep__list h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 5px;
}

.faq-prep__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-700);
}

.faq-contact {
  background: var(--ink-800);
  color: var(--white);
  padding: clamp(22px, 3.6vw, 32px);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.faq-contact__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.faq-contact h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin: 0 0 6px;
  color: rgba(252, 251, 247, 0.72);
}

.faq-contact__mail {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.6vw, 19px);
  line-height: 1.4;
  color: var(--cyan-200);
  word-break: break-all;
}

.faq-contact__hint {
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(252, 251, 247, 0.7);
}

.faq-contact__meta {
  margin: 0 0 22px;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.faq-contact__meta > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-dark);
}

.faq-contact__meta dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: rgba(252, 251, 247, 0.6);
}

.faq-contact__meta dd {
  margin: 0;
  font-size: 14px;
  color: var(--white);
  text-align: right;
}

/* ---------- 索引 ---------- */
.faq-section--index {
  background: var(--paper-100);
}

.faq-index {
  position: relative;
  padding: clamp(22px, 3.6vw, 36px);
  background: var(--white);
  border: 1px solid var(--faq-rule);
  overflow: hidden;
}

.faq-index__bg {
  position: absolute;
  top: -10%;
  right: -8%;
  width: min(420px, 62%);
  margin: 0;
  opacity: 0.14;
  pointer-events: none;
}

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

.faq-index__head {
  position: relative;
  max-width: 60ch;
}

.faq-index__head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.1;
  margin: 0 0 12px;
}

.faq-index__search {
  position: relative;
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 460px;
}

.page-faq .filter__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-700);
  margin-bottom: 8px;
}

.page-faq .filter__input {
  width: 100%;
  box-sizing: border-box;
  padding: 11px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--ink-900);
  background: var(--paper-100);
  border: 1px solid var(--paper-400);
  border-radius: 0;
  outline: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .filter__input:focus {
  border-color: var(--ink-700);
  background: var(--white);
}

.page-faq .filter__empty {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--gray-500);
}

.faq-index__groups {
  position: relative;
  display: grid;
  gap: clamp(20px, 3.2vw, 30px);
  margin-top: clamp(24px, 4vw, 34px);
}

.faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ink-900);
}

.faq-group__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-400);
}

.faq-group__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-group__list li {
  border-top: 1px solid var(--faq-rule-soft);
}

.faq-group__list li:first-child {
  border-top: 0;
}

.faq-group__list a {
  display: block;
  padding: 10px 0 10px 16px;
  position: relative;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-800);
  text-decoration: none;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.faq-group__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 7px;
  height: 1px;
  background: var(--paper-400);
  transition: width 0.2s var(--ease), background 0.2s var(--ease);
}

.faq-group__list a:hover,
.faq-group__list a:focus-visible {
  color: var(--ink-900);
  transform: translateX(2px);
}

.faq-group__list a:hover::before,
.faq-group__list a:focus-visible::before {
  width: 11px;
  background: var(--cyan-400);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 860px) {
  .faq-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .faq-card {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .faq-card__device {
    padding: 26px 18px;
  }

  .faq-card__device svg {
    width: 78px;
  }

  .faq-panels {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .faq-panel {
    display: flex;
    flex-direction: column;
  }

  .faq-prep {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(32px, 5vw, 56px);
  }

  .faq-index__groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 48px);
  }
}

@media (min-width: 1180px) {
  .faq-index__groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump,
  .page-faq .filter__input,
  .page-faq .faq-group__list a,
  .page-faq .faq-acc__sign::before,
  .page-faq .faq-acc__sign::after {
    transition: none;
  }

  .page-faq .faq-group__list a:hover,
  .page-faq .faq-group__list a:focus-visible {
    transform: none;
  }
}

.page-faq {
  --faq-rule: rgba(8, 28, 23, 0.14);
  --faq-rule-soft: rgba(8, 28, 23, 0.07);
  --faq-cut: 22px;
  padding-top: calc(var(--bar-h) + 24px);
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-faq .container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-inline: clamp(16px, 4vw, 40px);
  box-sizing: border-box;
}

.page-faq .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.07em;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-faq .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink-700);
  margin: 0 0 10px;
}

/* ---------- 首屏 ---------- */
.faq-hero {
  padding-bottom: clamp(40px, 7vw, 76px);
}

.faq-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.faq-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7.4vw, 66px);
  line-height: 1.02;
  letter-spacing: 0.005em;
  margin: 0 0 18px;
  color: var(--ink-900);
}

.page-faq .lead {
  font-size: clamp(15px, 2vw, 17.5px);
  line-height: 1.8;
  color: var(--ink-700);
  max-width: 46ch;
  margin: 0;
}

.faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: clamp(22px, 4vw, 34px);
}

.faq-jump {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-900);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.faq-jump:hover,
.faq-jump:focus-visible {
  color: var(--ink-700);
  border-bottom-color: var(--ink-700);
}

.faq-jump__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-700);
}

.faq-legend {
  background: var(--ink-900);
  color: var(--white);
  padding: clamp(20px, 3.4vw, 30px);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.faq-legend__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-200);
  margin: 0 0 14px;
}

.faq-legend__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--line-dark);
}

.faq-legend__list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 2px 10px;
  padding: 11px 0;
  border-top: 1px solid var(--line-dark);
}

.faq-legend__code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-400);
}

.faq-legend__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.2;
}

.faq-legend__desc {
  grid-column: 2;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(252, 251, 247, 0.72);
}

.faq-legend__foot {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--amber-400);
}

.faq-legend__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(46, 230, 197, 0.16);
}

/* ---------- 章节 ---------- */
.faq-section {
  padding: clamp(44px, 8vw, 88px) 0;
  border-top: 1px solid var(--faq-rule);
}

.faq-section--alt {
  background: var(--paper-200);
}

.faq-head {
  max-width: 62ch;
}

.faq-head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.08;
  margin: 0 0 14px;
}

.faq-head__lead {
  margin: 0;
  color: var(--ink-700);
  font-size: clamp(15px, 1.9vw, 16.5px);
  line-height: 1.8;
}

.faq-figure {
  margin: clamp(22px, 4vw, 34px) 0 clamp(26px, 4vw, 40px);
}

.faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.faq-figure__cap {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--gray-500);
}

/* ---------- 步骤卡片 ---------- */
.faq-cards {
  display: grid;
  gap: clamp(16px, 2.6vw, 22px);
}

.faq-card {
  display: grid;
  gap: 18px;
  background: var(--white);
  border: 1px solid var(--faq-rule);
  padding: clamp(18px, 3vw, 26px);
}

.faq-card__device {
  display: grid;
  place-items: center;
  padding: 18px;
  background: var(--ink-900);
  color: var(--cyan-200);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.faq-card__device svg {
  display: block;
  width: 64px;
  height: auto;
  max-width: 100%;
}

.faq-card__idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-700);
}

.faq-card h3 {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 25px);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 14px;
}

.faq-card__steps {
  list-style: none;
  counter-reset: faqstep;
  margin: 0;
  padding: 0;
}

.faq-card__steps li {
  position: relative;
  counter-increment: faqstep;
  padding-left: 38px;
  padding-bottom: 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-800);
}

.faq-card__steps li::before {
  content: counter(faqstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber-400);
}

.faq-card__steps li::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 22px;
  bottom: 2px;
  width: 1px;
  background: var(--faq-rule);
}

.faq-card__steps li:last-child {
  padding-bottom: 0;
}

.faq-card__steps li:last-child::after {
  display: none;
}

/* ---------- 对照表 ---------- */
.faq-table__wrap {
  margin-top: clamp(24px, 4vw, 36px);
  overflow-x: auto;
}

.faq-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--white);
}

.faq-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-700);
}

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

.faq-table thead th {
  background: var(--ink-900);
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
}

.faq-table tbody tr:nth-child(even) {
  background: var(--paper-200);
}

/* ---------- 手风琴 ---------- */
.faq-acc {
  margin-top: clamp(22px, 4vw, 34px);
  border-bottom: 1px solid var(--faq-rule);
}

.faq-acc__item {
  border-top: 1px solid var(--faq-rule);
}

.faq-acc__item summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

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

.faq-acc__q {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--ink-900);
}

.faq-acc__sign {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin-top: 4px;
  border: 1px solid var(--ink-700);
}

.faq-acc__sign::before,
.faq-acc__sign::after {
  content: "";
  position: absolute;
  background: var(--ink-700);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.faq-acc__sign::before {
  left: 4px;
  right: 4px;
  top: 50%;
  height: 1px;
}

.faq-acc__sign::after {
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 1px;
}

.faq-acc__item[open] .faq-acc__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.faq-acc__body {
  padding: 0 0 20px;
}

.faq-acc__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 数据与订阅 ---------- */
.faq-panels {
  display: grid;
  gap: clamp(16px, 2.6vw, 22px);
  margin-top: clamp(22px, 4vw, 34px);
}

.faq-panel {
  padding: clamp(20px, 3.4vw, 30px);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.faq-panel--dark {
  background: var(--ink-900);
  color: var(--white);
}

.faq-panel--amber {
  background: var(--amber-100);
  color: var(--ink-900);
  clip-path: polygon(0 var(--faq-cut), var(--faq-cut) 0, 100% 0, 100% 100%, 0 100%);
}

.faq-panel__tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.faq-panel--dark .faq-panel__tag {
  color: var(--cyan-400);
}

.faq-panel--amber .faq-panel__tag {
  color: var(--ink-700);
}

.faq-panel h3 {
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 26px);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 16px;
}

.faq-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-panel__list li {
  padding: 11px 0;
  border-top: 1px solid var(--faq-rule);
  font-size: 14.5px;
  line-height: 1.65;
}

.faq-panel--dark .faq-panel__list li {
  border-top-color: var(--line-dark);
  color: rgba(252, 251, 247, 0.86);
}

.faq-panel__key {
  display: inline-block;
  min-width: 60px;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-400);
}

.faq-panel--amber .faq-panel__key {
  color: var(--ink-700);
}

.faq-panel__note {
  margin: 14px 0 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--gray-500);
}

.faq-panel--dark .faq-panel__note {
  color: rgba(252, 251, 247, 0.66);
}

/* ---------- 联系支持前准备 ---------- */
.faq-prep {
  display: grid;
  gap: clamp(22px, 3.4vw, 32px);
  margin-top: clamp(22px, 4vw, 34px);
}

.faq-prep__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-prep__list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--faq-rule);
}

.faq-prep__list li:last-child {
  border-bottom: 1px solid var(--faq-rule);
}

.faq-prep__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-400);
  padding-top: 2px;
}

.faq-prep__list h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 5px;
}

.faq-prep__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-700);
}

.faq-contact {
  background: var(--ink-800);
  color: var(--white);
  padding: clamp(22px, 3.6vw, 32px);
  clip-path: polygon(0 0, calc(100% - var(--faq-cut)) 0, 100% var(--faq-cut), 100% 100%, 0 100%);
}

.faq-contact__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.faq-contact h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  margin: 0 0 6px;
  color: rgba(252, 251, 247, 0.72);
}

.faq-contact__mail {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.6vw, 19px);
  line-height: 1.4;
  color: var(--cyan-200);
  word-break: break-all;
}

.faq-contact__hint {
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(252, 251, 247, 0.7);
}

.faq-contact__meta {
  margin: 0 0 22px;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.faq-contact__meta > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-dark);
}

.faq-contact__meta dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(252, 251, 247, 0.6);
}

.faq-contact__meta dd {
  margin: 0;
  font-size: 14px;
  color: var(--white);
  text-align: right;
}

/* ---------- 热门问题索引 ---------- */
.faq-index {
  position: relative;
  padding: clamp(22px, 3.6vw, 36px);
  background: var(--white);
  border: 1px solid var(--faq-rule);
  overflow: hidden;
}

.faq-index__bg {
  position: absolute;
  top: -12%;
  right: -10%;
  width: min(420px, 62%);
  margin: 0;
  opacity: 0.14;
  pointer-events: none;
}

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

.faq-index__head {
  position: relative;
  max-width: 60ch;
}

.faq-index__head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.1;
  margin: 0 0 12px;
}

.faq-index__search {
  position: relative;
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 460px;
}

.page-faq .filter__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-700);
  margin-bottom: 8px;
}

.page-faq .filter__input {
  width: 100%;
  box-sizing: border-box;
  padding: 11px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--ink-900);
  background: var(--paper-100);
  border: 1px solid var(--paper-400);
  border-radius: 0;
  outline: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-faq .filter__input:focus {
  border-color: var(--ink-700);
  background: var(--white);
}

.page-faq .filter__empty {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--gray-500);
}

.faq-index__groups {
  position: relative;
  display: grid;
  gap: clamp(20px, 3.2vw, 30px);
  margin-top: clamp(24px, 4vw, 34px);
}

.faq-group__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ink-900);
}

.faq-group__code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber-400);
}

.faq-group__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-group__list li {
  border-top: 1px solid var(--faq-rule-soft);
}

.faq-group__list li:first-child {
  border-top: 0;
}

.faq-group__list a {
  display: block;
  position: relative;
  padding: 10px 0 10px 16px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-800);
  text-decoration: none;
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.faq-group__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 7px;
  height: 1px;
  background: var(--paper-400);
  transition: width 0.2s var(--ease), background 0.2s var(--ease);
}

.faq-group__list a:hover,
.faq-group__list a:focus-visible {
  color: var(--ink-900);
  transform: translateX(2px);
}

.faq-group__list a:hover::before,
.faq-group__list a:focus-visible::before {
  width: 11px;
  background: var(--cyan-400);
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .faq-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .faq-card {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .faq-card__device {
    padding: 26px 18px;
  }

  .faq-card__device svg {
    width: 76px;
  }

  .faq-panels {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .faq-prep {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(32px, 5vw, 56px);
  }

  .faq-index__groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 48px);
  }
}

@media (min-width: 1180px) {
  .faq-index__groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-jump,
  .page-faq .filter__input,
  .page-faq .faq-group__list a,
  .page-faq .faq-acc__sign::before,
  .page-faq .faq-acc__sign::after {
    transition: none;
  }

  .page-faq .faq-group__list a:hover,
  .page-faq .faq-group__list a:focus-visible {
    transform: none;
  }
}