.page-faq {
  --faq-rail-w: 218px;
  --faq-hair: rgba(26, 34, 48, 0.14);
  --faq-hair-soft: rgba(26, 34, 48, 0.08);
  background: var(--paper-100);
  color: var(--text-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  position: relative;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 46px 46px;
  color: var(--paper-100);
  padding: clamp(22px, 4vw, 40px) 0 0;
}

.page-faq .faq-hero .breadcrumb,
.page-faq .faq-hero .breadcrumb ol,
.page-faq .faq-hero .breadcrumb li,
.page-faq .faq-hero .breadcrumb a {
  color: var(--metal-600);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.page-faq .faq-hero .breadcrumb a:hover {
  color: var(--cyan);
}

.page-faq .faq-hero__head {
  max-width: 62rem;
  padding-top: clamp(18px, 3vw, 32px);
}

.page-faq .faq-hero h1 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper-100);
}

.page-faq .faq-hero h1::after {
  content: "";
  display: block;
  width: 96px;
  height: 4px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-faq .faq-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.9vw, 1.12rem);
  line-height: 1.78;
  color: var(--metal-300);
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-faq .faq-hero__media-wrap {
  padding-top: clamp(22px, 4vw, 40px);
}

.page-faq .faq-hero__media {
  margin: 0;
  border-top: 1px solid var(--ink-700);
  border-right: 1px solid var(--ink-700);
}

.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  max-width: 100%;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 26px 100%);
  filter: saturate(0.92) contrast(1.05);
}

.page-faq .faq-hero__media figcaption {
  padding: 10px 0 14px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--metal-600);
}

/* ---------- 五步总览 ---------- */
.page-faq .faq-map {
  position: relative;
  background: var(--paper-100);
  padding: clamp(34px, 6vw, 66px) 0 clamp(30px, 5vw, 54px);
}

.page-faq .faq-map::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 42%, var(--orange) 42% 100%);
}

.page-faq .faq-map__head {
  max-width: 58rem;
}

.page-faq .faq-map__head h2 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--text-ink);
}

.page-faq .faq-map__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: #3c4657;
}

.page-faq .faq-map__line {
  display: none;
  width: 100%;
  height: auto;
  margin: clamp(18px, 3vw, 30px) 0 6px;
}

.page-faq .faq-map__line polyline {
  fill: none;
  stroke: var(--ink-700);
  stroke-width: 1;
  stroke-dasharray: 7 7;
}

.page-faq .faq-map__node {
  fill: var(--paper-100);
  stroke: var(--ink-700);
  stroke-width: 2;
}

.page-faq .faq-map__node--key {
  fill: var(--cyan);
  stroke: var(--ink-900);
  stroke-width: 3;
}

.page-faq .faq-map__track {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-faq .faq-map__item {
  min-width: 0;
}

.page-faq .faq-map__link {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num hint";
  column-gap: 12px;
  align-items: center;
  padding: 12px 14px;
  background: var(--paper-200);
  border-left: 3px solid var(--ink-700);
  color: var(--text-ink);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color 200ms ease-out, border-color 200ms ease-out;
}

.page-faq .faq-map__link:hover,
.page-faq .faq-map__link:focus-visible {
  background: var(--paper-100);
  border-left-color: var(--cyan);
}

.page-faq .faq-map__item--key .faq-map__link {
  border-left-color: var(--orange);
  background: var(--paper-100);
}

.page-faq .faq-map__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan-text);
}

.page-faq .faq-map__item--key .faq-map__num {
  color: var(--orange-text);
}

.page-faq .faq-map__name {
  grid-area: name;
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.4;
}

.page-faq .faq-map__hint {
  grid-area: hint;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--metal-600);
  line-height: 1.5;
}

/* ---------- 主体两栏 ---------- */
.page-faq .faq-body {
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 7vw, 84px);
}

.page-faq .faq-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 42px);
  align-items: start;
}

/* ---------- 左侧导轨 ---------- */
.page-faq .faq-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  background: var(--paper-100);
  border-bottom: 1px solid var(--faq-hair);
  padding: 8px 0 10px;
  margin: 0 calc(-1 * var(--edge));
  padding-left: var(--edge);
  padding-right: var(--edge);
}

.page-faq .faq-rail__caption {
  display: none;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--metal-600);
  text-transform: uppercase;
}

.page-faq .faq-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-faq .faq-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 11px;
  border: 1px solid var(--faq-hair);
  color: var(--text-ink);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 600;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  transition: border-color 200ms ease-out, color 200ms ease-out;
}

.page-faq .faq-rail__link:hover,
.page-faq .faq-rail__link:focus-visible {
  border-color: var(--cyan-text);
  color: var(--cyan-text);
}

.page-faq .faq-rail__link--key {
  border-color: var(--orange);
}

.page-faq .faq-rail__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--metal-600);
}

.page-faq .faq-rail__link--key .faq-rail__num {
  color: var(--orange-text);
}

.page-faq .faq-rail__note {
  display: none;
}

/* ---------- 步骤通用 ---------- */
.page-faq .faq-steps {
  min-width: 0;
}

.page-faq .step {
  position: relative;
  padding: clamp(22px, 4vw, 34px) 0 clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--faq-hair);
  scroll-margin-top: 72px;
}

.page-faq .step:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-faq .step__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 14px;
}

.page-faq .step__num {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan-text);
  border: 1px solid var(--faq-hair);
  padding: 2px 8px;
}

.page-faq .step__flag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  background: var(--orange);
  color: var(--ink-900);
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.page-faq .step__head h2 {
  flex: 1 1 100%;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.22rem, 3.4vw, 1.66rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--text-ink);
}

.page-faq .step__body p {
  max-width: 64ch;
  margin: 0 0 1.05em;
  font-size: 0.98rem;
  line-height: 1.8;
}

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

.page-faq .step__body a {
  color: var(--cyan-text);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-faq .step__body a:hover {
  color: var(--orange-text);
}

.page-faq .step__points,
.page-faq .step__steps {
  list-style: none;
  margin: 0 0 1.1em;
  padding: 0;
  max-width: 66ch;
}

.page-faq .step__points li,
.page-faq .step__steps li {
  position: relative;
  padding: 9px 0 9px 26px;
  font-size: 0.96rem;
  line-height: 1.72;
  border-bottom: 1px dashed var(--faq-hair-soft);
}

.page-faq .step__points li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 19px;
  width: 8px;
  height: 8px;
  background: var(--ink-700);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3px), calc(100% - 3px) 100%, 0 100%);
}

.page-faq .step__points--check li::before {
  background: var(--cyan);
}

.page-faq .step__steps li {
  padding-left: 30px;
}

.page-faq .step__steps-num {
  position: absolute;
  left: 0;
  top: 9px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--orange-text);
}

.page-faq .step__observe {
  max-width: 66ch;
  margin: 1.1em 0 0;
  padding: 14px 16px;
  background: var(--paper-200);
  border-left: 3px solid var(--ink-700);
  font-size: 0.94rem;
  line-height: 1.75;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-faq .step__observe-label {
  display: inline-block;
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--cyan-text);
  font-weight: 700;
}

/* ---------- 第 2 条重点段 ---------- */
.page-faq .step--key {
  background: var(--paper-200);
  border-left: 4px solid var(--orange);
  border-top: 0;
  padding-left: clamp(14px, 3vw, 26px);
  padding-right: clamp(12px, 2.5vw, 22px);
  padding-top: clamp(22px, 4vw, 34px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-faq .step--key .step__observe {
  background: var(--paper-100);
}

.page-faq .faq-callout {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin-top: 18px;
  padding: 13px 16px;
  background: rgba(255, 106, 43, 0.08);
  border-left: 3px solid var(--orange);
}

.page-faq .faq-callout__mark {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange-text);
  padding-top: 2px;
}

.page-faq .faq-callout p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  max-width: none;
}

/* ---------- 终端配置核查 ---------- */
.page-faq .devices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.page-faq .device {
  background: var(--paper-100);
  border: 1px solid var(--faq-hair);
  border-top: 3px solid var(--ink-800);
  padding: 16px 16px 14px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-faq .device__head {
  margin-bottom: 8px;
}

.page-faq .device__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  background: var(--ink-800);
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-faq .device__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-ink);
}

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

.page-faq .check-row {
  position: relative;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 9px 0;
  border-bottom: 1px dashed var(--faq-hair-soft);
  cursor: pointer;
}

.page-faq .check-row input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-faq .check-box {
  display: block;
  width: 17px;
  height: 17px;
  margin-top: 3px;
  border: 1.5px solid var(--metal-600);
  background: transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%);
  transition: background-color 160ms ease-out, border-color 160ms ease-out;
}

.page-faq .check-row input:checked + .check-box {
  background: var(--cyan);
  border-color: var(--cyan-text);
}

.page-faq .check-row input:focus-visible + .check-box {
  outline: 2px solid var(--cyan-text);
  outline-offset: 2px;
}

.page-faq .check-text {
  font-size: 0.9rem;
  line-height: 1.65;
  transition: color 160ms ease-out;
}

.page-faq .check-row input:checked ~ .check-text {
  color: var(--metal-600);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.page-faq .device__meta {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: var(--metal-600);
}

.page-faq .devices__note {
  max-width: 66ch;
  margin: 16px 0 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: #3c4657;
}

.page-faq .devices__note a {
  color: var(--cyan-text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-faq .faq-figure {
  margin: clamp(20px, 3.5vw, 30px) 0 0;
  max-width: 100%;
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--faq-hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-faq .faq-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: var(--metal-600);
}

/* ---------- 人工支持 ---------- */
.page-faq .step--support {
  background: var(--ink-900);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 38px 38px;
  color: var(--paper-100);
  border-top: 0;
  padding: clamp(24px, 4vw, 38px) clamp(18px, 3.5vw, 32px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-faq .step--support .step__num {
  color: var(--cyan);
  border-color: var(--ink-700);
}

.page-faq .step--support .step__head h2 {
  color: var(--paper-100);
}

.page-faq .step--support .step__body p {
  color: var(--metal-300);
}

.page-faq .support-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-faq .support-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  padding: 10px 13px;
  background: var(--ink-800);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--paper-100);
}

.page-faq .support-list__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-faq .support-contact {
  margin-top: 18px;
  padding: 16px;
  border-left: 3px solid var(--orange);
  background: var(--ink-800);
}

.page-faq .support-contact__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--metal-600);
}

.page-faq .support-contact__mail {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  color: var(--paper-100);
  word-break: break-all;
}

.page-faq .support-contact__note {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--metal-300);
}

.page-faq .support-btn {
  margin-top: 20px;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-faq .faq-map__track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-faq .support-list li {
    grid-template-columns: 8.5em minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-faq .faq-map__line {
    display: block;
  }

  .page-faq .faq-map__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }

  .page-faq .faq-map__link {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "num"
      "name"
      "hint";
    row-gap: 4px;
    padding: 14px 13px 16px;
    min-height: 118px;
  }

  .page-faq .faq-figure {
    max-width: 640px;
    margin-left: auto;
  }
}

@media (min-width: 980px) {
  .page-faq .faq-body__grid {
    grid-template-columns: var(--faq-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: 28px;
    margin: 0;
    padding: 0;
    border-bottom: 0;
    background: transparent;
  }

  .page-faq .faq-rail__caption {
    display: block;
  }

  .page-faq .faq-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    border-left: 1px solid var(--faq-hair);
    padding-bottom: 0;
  }

  .page-faq .faq-rail__link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px;
    align-items: baseline;
    white-space: normal;
    padding: 9px 8px 9px 12px;
    border: 0;
    border-left: 3px solid transparent;
    background: transparent;
    clip-path: none;
    margin-left: -1px;
  }

  .page-faq .faq-rail__link:hover,
  .page-faq .faq-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: var(--paper-200);
  }

  .page-faq .faq-rail__link--key {
    border-left-color: var(--orange);
    background: var(--paper-200);
  }

  .page-faq .faq-rail__note {
    display: block;
    margin-top: 18px;
    padding: 12px 13px;
    background: var(--ink-900);
    border-left: 3px solid var(--cyan);
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  }

  .page-faq .faq-rail__note-title {
    margin: 0 0 4px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    color: var(--metal-600);
  }

  .page-faq .faq-rail__note-val {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--cyan);
    letter-spacing: 0.04em;
  }

  .page-faq .faq-rail__note-sub {
    margin: 4px 0 0;
    font-size: 0.76rem;
    line-height: 1.5;
    color: var(--metal-300);
  }

  .page-faq .step {
    scroll-margin-top: 24px;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-map__link,
  .page-faq .faq-rail__link,
  .page-faq .check-box,
  .page-faq .check-text {
    transition: none;
  }
}