.page-faq {
  --faq-line: rgba(234, 246, 255, 0.14);
  --faq-line-strong: rgba(234, 246, 255, 0.30);
  --faq-card: rgba(11, 39, 72, 0.55);
  --faq-soft: rgba(11, 39, 72, 0.32);
  background-color: var(--ink-950);
  background-image: radial-gradient(120% 55% at 82% 0%, rgba(45, 226, 196, 0.10), transparent 62%);
  color: var(--ice-100);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-faq h1,
.page-faq h2,
.page-faq h3 {
  margin: 0;
  line-height: 1.18;
}

.page-faq p {
  margin: 0;
}

.page-faq .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--aurora-400);
  margin-bottom: 8px;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(22px, 5vw, 52px) var(--gutter) clamp(30px, 6vw, 60px);
  display: grid;
  gap: clamp(20px, 4vw, 38px);
}

.page-faq .faq-hero__frame {
  position: relative;
  padding: clamp(20px, 4vw, 36px);
  border: 1px solid var(--faq-line-strong);
  background: linear-gradient(158deg, rgba(11, 39, 72, 0.88), rgba(7, 17, 31, 0.55));
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-faq .faq-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--aurora-400), var(--lime-400), var(--orange-500));
  opacity: 0.85;
}

.page-faq .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ice-50);
}

.page-faq .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--slate-600);
}

.page-faq .breadcrumbs__link {
  color: var(--ice-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-faq .breadcrumbs__link:hover,
.page-faq .breadcrumbs__link:focus-visible {
  color: var(--aurora-400);
  border-bottom-color: var(--aurora-400);
}

.page-faq .breadcrumbs__current {
  color: var(--ice-50);
}

.page-faq .faq-hero h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 6.4vw, 46px);
  letter-spacing: 0.01em;
  color: var(--paper-0);
  margin-top: 6px;
}

.page-faq .faq-hero__lead {
  margin-top: 16px;
  max-width: 40em;
  font-size: clamp(14.5px, 2.4vw, 16.5px);
  line-height: 1.85;
  color: var(--ice-70);
}

.page-faq .faq-hero__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.page-faq .faq-hero__jump a {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ice-70);
  padding: 7px 11px;
  border: 1px solid var(--faq-line);
  background: rgba(7, 17, 31, 0.4);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-faq .faq-hero__jump a:hover,
.page-faq .faq-hero__jump a:focus-visible {
  color: var(--paper-0);
  border-color: var(--aurora-400);
  transform: translateY(-2px);
}

.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 9% 100%);
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(205deg, rgba(7, 17, 31, 0.08), rgba(7, 17, 31, 0.72));
  pointer-events: none;
}

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

/* ---------- 区块与标题 ---------- */
.page-faq .faq-section {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(30px, 6vw, 64px) var(--gutter);
  border-top: 1px dashed var(--faq-line);
}

.page-faq .faq-section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 3vw, 26px);
  align-items: start;
  margin-bottom: clamp(18px, 3.5vw, 30px);
}

.page-faq .section-index {
  font-family: var(--font-mono);
  font-size: clamp(28px, 7vw, 54px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--track, var(--aurora-400));
  opacity: 0.92;
}

.page-faq .faq-section h2 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(21px, 4.4vw, 34px);
  letter-spacing: 0.01em;
  color: var(--paper-0);
}

.page-faq .faq-section__lead {
  margin-top: 10px;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ice-70);
}

/* ---------- 三条路径的状态色 ---------- */
.page-faq .faq-track--board {
  --track: var(--orange-500);
  --track-soft: rgba(255, 106, 42, 0.09);
  --track-line: rgba(255, 106, 42, 0.38);
}

.page-faq .faq-track--login {
  --track: var(--aurora-400);
  --track-soft: rgba(45, 226, 196, 0.09);
  --track-line: rgba(45, 226, 196, 0.36);
}

.page-faq .faq-track--mobile {
  --track: var(--lime-400);
  --track-soft: rgba(182, 255, 59, 0.09);
  --track-line: rgba(182, 255, 59, 0.34);
}

/* ---------- 筛选 ---------- */
.page-faq .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.page-faq .filter-btn {
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1;
  padding: 9px 14px;
  color: var(--ice-70);
  background: transparent;
  border: 1px solid var(--faq-line-strong);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .filter-btn:hover {
  color: var(--paper-0);
  border-color: var(--aurora-400);
}

.page-faq .filter-btn[aria-pressed="true"] {
  color: var(--ink-950);
  background: var(--aurora-400);
  border-color: var(--aurora-400);
  font-weight: 500;
}

.page-faq .filter-btn:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 3px;
}

.page-faq .filter-count {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ice-50);
  margin-left: auto;
}

/* ---------- 问题卡 ---------- */
.page-faq .faq-problems {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-faq .faq-problem {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 16px;
  background: var(--faq-card);
  border: 1px solid var(--faq-line);
  border-left: 3px solid var(--aurora-400);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

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

.page-faq .faq-problem--board {
  border-left-color: var(--orange-500);
}

.page-faq .faq-problem--login {
  border-left-color: var(--aurora-400);
}

.page-faq .faq-problem--mobile {
  border-left-color: var(--lime-400);
}

.page-faq .faq-problem--other {
  border-left-color: var(--slate-600);
}

.page-faq .faq-problem:hover {
  border-color: var(--aurora-400);
  transform: translateY(-3px);
}

.page-faq .faq-problem h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper-0);
}

.page-faq .faq-problem p {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ice-70);
}

.page-faq .faq-problem__link {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--aurora-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-faq .faq-problem__link:hover,
.page-faq .faq-problem__link:focus-visible {
  color: var(--paper-0);
  border-bottom-color: var(--paper-0);
}

/* ---------- 决策树 ---------- */
.page-faq .faq-tree-wrap {
  margin-top: clamp(20px, 4vw, 30px);
  padding: clamp(14px, 3vw, 24px);
  background: linear-gradient(122deg, rgba(11, 39, 72, 0.72), rgba(7, 17, 31, 0.32));
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow-x: auto;
}

.page-faq .faq-tree-cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ice-50);
  margin-bottom: 10px;
}

.page-faq .faq-tree {
  display: block;
  width: 100%;
  min-width: 480px;
  height: auto;
}

.page-faq .faq-tree text {
  font-family: var(--font-sans);
  font-size: 25px;
  fill: var(--ice-100);
}

.page-faq .tree-line {
  fill: none;
  stroke-width: 1.6;
}

.page-faq .tree-line--start {
  stroke: var(--slate-600);
}

.page-faq .tree-line--board {
  stroke: var(--orange-500);
  opacity: 0.75;
}

.page-faq .tree-line--login {
  stroke: var(--aurora-400);
  opacity: 0.75;
}

.page-faq .tree-line--mobile {
  stroke: var(--lime-400);
  opacity: 0.7;
}

.page-faq .tree-node {
  fill: rgba(7, 17, 31, 0.72);
  stroke: var(--faq-line-strong);
  stroke-width: 1;
}

.page-faq .tree-accent--board {
  fill: var(--orange-500);
}

.page-faq .tree-accent--login {
  fill: var(--aurora-400);
}

.page-faq .tree-accent--mobile {
  fill: var(--lime-400);
}

/* ---------- 步骤列表 ---------- */
.page-faq .faq-steps {
  display: grid;
  gap: 0;
}

.page-faq .faq-step {
  border-top: 1px solid var(--faq-line);
}

.page-faq .faq-step:last-child {
  border-bottom: 1px solid var(--faq-line);
}

.page-faq .faq-step > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}

.page-faq .faq-step > summary::-webkit-details-marker {
  display: none;
}

.page-faq .faq-step > summary:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 3px;
}

.page-faq .faq-step__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--track, var(--aurora-400));
  padding-top: 2px;
}

.page-faq .faq-step__title {
  flex: 1 1 auto;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--paper-0);
  line-height: 1.55;
}

.page-faq .faq-step__mark {
  position: relative;
  flex: none;
  align-self: center;
  width: 18px;
  height: 18px;
  border: 1px solid var(--faq-line-strong);
  transition: border-color var(--dur) var(--ease);
}

.page-faq .faq-step__mark::before,
.page-faq .faq-step__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--ice-70);
}

.page-faq .faq-step__mark::before {
  width: 9px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-faq .faq-step__mark::after {
  width: 1.5px;
  height: 9px;
  transform: translate(-50%, -50%);
  transition: transform var(--dur) var(--ease);
}

.page-faq .faq-step[open] .faq-step__mark {
  border-color: var(--track, var(--aurora-400));
}

.page-faq .faq-step[open] .faq-step__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-faq .faq-step__body {
  padding: 0 0 18px;
}

.page-faq .faq-step__body p {
  max-width: 40em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ice-70);
}

/* ---------- 提示卡 ---------- */
.page-faq .faq-tip {
  margin-top: clamp(18px, 3.5vw, 26px);
  padding: 16px 18px;
  background: var(--track-soft, rgba(45, 226, 196, 0.09));
  border: 1px solid var(--track-line, rgba(45, 226, 196, 0.36));
  border-left-width: 3px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-faq .faq-tip__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--track, var(--aurora-400));
  margin-bottom: 6px;
}

.page-faq .faq-tip p:last-child {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice-70);
  max-width: 44em;
}

/* ---------- 移动端区块 ---------- */
.page-faq .faq-media-row {
  display: grid;
  gap: clamp(18px, 3.5vw, 28px);
}

.page-faq .faq-figure {
  margin: 0;
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

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

/* ---------- 恢复路径 ---------- */
.page-faq .faq-recover {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-faq .faq-recover__card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 22px 18px 18px;
  background: var(--faq-card);
  border: 1px solid var(--faq-line);
  color: inherit;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-faq .faq-recover__card:hover,
.page-faq .faq-recover__card:focus-visible {
  border-color: var(--aurora-400);
  background: rgba(11, 39, 72, 0.8);
  transform: translateY(-3px);
}

.page-faq .faq-recover__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lime-400);
}

.page-faq .faq-recover__card h3 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper-0);
}

.page-faq .faq-recover__card p {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ice-70);
}

.page-faq .faq-recover__go {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--aurora-400);
}

.page-faq .faq-recover__back {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice-50);
}

.page-faq .faq-recover__back a {
  color: var(--aurora-400);
  text-decoration: none;
  border-bottom: 1px solid var(--aurora-24);
}

.page-faq .faq-recover__back a:hover,
.page-faq .faq-recover__back a:focus-visible {
  border-bottom-color: var(--aurora-400);
}

/* ---------- 反馈 ---------- */
.page-faq .faq-feedback-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-faq .faq-panel {
  padding: clamp(18px, 3vw, 26px);
  background: linear-gradient(150deg, rgba(11, 39, 72, 0.72), rgba(7, 17, 31, 0.42));
  border: 1px solid var(--faq-line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-faq .faq-panel--contact {
  border-color: rgba(45, 226, 196, 0.32);
}

.page-faq .faq-panel__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--aurora-400);
  margin-bottom: 14px;
}

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

.page-faq .faq-checklist li {
  padding-left: 16px;
  position: relative;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ice-70);
}

.page-faq .faq-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--lime-400);
}

.page-faq .faq-checklist span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--paper-0);
  margin-bottom: 2px;
}

.page-faq .faq-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-faq .faq-actions .btn {
  font-family: var(--font-sans);
  font-size: 14px;
  text-decoration: none;
}

.page-faq .faq-contact {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-faq .faq-contact__item {
  display: grid;
  gap: 3px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--faq-line);
}

.page-faq .faq-contact__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-faq .faq-contact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ice-50);
}

.page-faq .faq-contact dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--paper-0);
  word-break: break-word;
}

.page-faq .faq-panel__note {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ice-50);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-faq .faq-problems {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-faq .faq-step__body {
    padding-left: 34px;
  }
}

@media (min-width: 860px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
  }

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

  .page-faq .faq-feedback-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-faq .faq-media-row {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-hero__jump a,
  .page-faq .faq-problem,
  .page-faq .faq-recover__card,
  .page-faq .filter-btn,
  .page-faq .faq-step__mark,
  .page-faq .faq-step__mark::after {
    transition: none;
  }

  .page-faq .faq-hero__jump a:hover,
  .page-faq .faq-problem:hover,
  .page-faq .faq-recover__card:hover {
    transform: none;
  }
}