.page-faq {
  --faq-index: 190px;
  --faq-gap: 52px;
  --faq-line-ink: rgba(11, 14, 28, 0.14);
  --faq-line-ink-strong: rgba(11, 14, 28, 0.26);
  background: var(--ink-950);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-faq .tut-hero {
  position: relative;
  padding: calc(var(--header-h) + 56px) 0 44px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(38, 242, 226, 0.09) 0%, rgba(10, 16, 48, 0) 58%),
    var(--ink-950);
}

.page-faq .tut-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-soft) 0 1px,
    transparent 1px 104px
  );
  opacity: 0.85;
}

.page-faq .tut-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-faq .tut-h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 6vw, 54px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .tut-lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel);
}

.page-faq .tut-hero-meta {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-faq .tut-hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-faq .tut-hero-num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
}

.page-faq .tut-hero-cap {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ---------- 主体两栏 ---------- */
.page-faq .tut-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 72px;
}

.page-faq .tut-index {
  position: relative;
}

.page-faq .tut-index-title {
  margin: 0 0 10px;
}

.page-faq .tut-index-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--line);
}

.page-faq .tut-index-list::-webkit-scrollbar {
  display: none;
}

.page-faq .tut-index-list li {
  flex: 0 0 auto;
}

.page-faq .tut-index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-bottom: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--steel);
  text-decoration: none;
  transition: color 220ms var(--ease), border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-faq .tut-index-no {
  font-size: 12px;
  font-weight: 700;
  color: rgba(167, 179, 218, 0.7);
  transition: color 220ms var(--ease);
}

.page-faq .tut-index-link:hover {
  color: var(--paper);
}

.page-faq .tut-index-link:hover .tut-index-no {
  color: var(--cyan);
}

.page-faq .tut-index-link[aria-current="true"] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  background: rgba(38, 242, 226, 0.07);
}

.page-faq .tut-index-link[aria-current="true"] .tut-index-no {
  color: var(--cyan);
}

.page-faq .tut-body {
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */
.page-faq .tut-sec {
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-faq .tut-sec + .tut-sec {
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--line);
}

.page-faq .tut-sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 16px;
  align-items: start;
  margin-bottom: 20px;
}

.page-faq .tut-sec-no {
  grid-row: 1 / span 2;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(38, 242, 226, 0.28);
  transition: color 420ms var(--ease);
}

.page-faq .tut-sec.is-visible .tut-sec-no {
  color: var(--cyan);
}

.page-faq .tut-sec-title {
  margin: 0;
  font-size: clamp(21px, 3.4vw, 28px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-faq .tut-sec-sub {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 纸白面板 ---------- */
.page-faq .tut-panel {
  padding: 22px 18px;
  background: var(--paper);
  color: var(--ink-deep);
}

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

.page-faq .tut-panel a:hover {
  color: var(--ink-deep);
}

.page-faq .tut-panel-note {
  margin: 22px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--cyan-deep);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 14, 28, 0.76);
}

/* ---------- 01 步骤流程 ---------- */
.page-faq .tut-flow {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-faq .tut-flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--faq-line-ink-strong);
}

.page-faq .tut-flow-item {
  position: relative;
  padding: 0 0 24px;
}

.page-faq .tut-flow-item:last-child {
  padding-bottom: 0;
}

.page-faq .tut-flow-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cyan-deep);
}

.page-faq .tut-flow-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-deep);
}

.page-faq .tut-flow-num {
  display: inline-block;
  margin-right: 9px;
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan-deep);
  letter-spacing: 0.04em;
}

.page-faq .tut-flow-text {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 14, 28, 0.78);
}

.page-faq .tut-fig {
  margin: 24px 0 0;
  padding: 0;
}

.page-faq .tut-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06) brightness(0.94);
  border: 1px solid var(--line);
}

/* ---------- 02 费用路径 ---------- */
.page-faq .tut-path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0 0 18px;
  border-bottom: 1px solid var(--faq-line-ink);
}

.page-faq .tut-path-step {
  display: inline-block;
  padding: 5px 10px;
  font-size: 13px;
  line-height: 1.4;
  border: 1px solid currentColor;
}

.page-faq .tut-path-step.is-1 {
  color: rgba(11, 14, 28, 0.5);
}

.page-faq .tut-path-step.is-2 {
  color: var(--cyan-deep);
}

.page-faq .tut-path-step.is-3 {
  color: var(--orange);
  font-weight: 700;
}

.page-faq .tut-path-arrow {
  font-size: 16px;
  color: var(--faq-line-ink-strong);
}

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

.page-faq .tut-fee-item {
  padding: 18px 0;
  border-top: 1px solid var(--faq-line-ink);
}

.page-faq .tut-fee-item:last-child {
  border-bottom: 1px solid var(--faq-line-ink);
}

.page-faq .tut-fee-name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-deep);
}

.page-faq .tut-fee-desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 14, 28, 0.78);
}

/* ---------- 03 档位对照 ---------- */
.page-faq .tut-table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-faq .tut-compare {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.7;
}

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

.page-faq .tut-compare thead th {
  font-size: 12px;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: rgba(11, 14, 28, 0.58);
  border-bottom: 1px solid var(--faq-line-ink-strong);
}

.page-faq .tut-compare thead th:nth-child(2) {
  color: var(--cyan-deep);
}

.page-faq .tut-compare thead th:nth-child(3) {
  color: var(--orange);
}

.page-faq .tut-compare tbody th {
  width: 26%;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-faq .tut-compare tbody td {
  color: rgba(11, 14, 28, 0.78);
}

.page-faq .tut-compare tbody tr:last-child th,
.page-faq .tut-compare tbody tr:last-child td {
  border-bottom: none;
}

/* ---------- 04 有效期 ---------- */
.page-faq .tut-validity {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-faq .tut-validity-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  position: relative;
}

.page-faq .tut-validity-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--faq-line-ink-strong);
}

.page-faq .tut-validity-item {
  position: relative;
  padding: 0 0 20px;
}

.page-faq .tut-validity-item:last-child {
  padding-bottom: 0;
}

.page-faq .tut-validity-item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cyan-deep);
}

.page-faq .tut-validity-item:last-child::before {
  border-color: var(--magenta);
}

.page-faq .tut-validity-node {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-deep);
}

.page-faq .tut-validity-node .mono {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-deep);
  background: rgba(14, 143, 138, 0.14);
}

.page-faq .tut-validity-text {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 14, 28, 0.78);
}

.page-faq .tut-validity-fig {
  margin: 0;
  align-self: start;
}

.page-faq .tut-validity-fig img {
  display: block;
  width: 100%;
  max-width: 280px;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06) brightness(0.92);
  border: 1px solid var(--faq-line-ink);
}

/* ---------- 05 排查清单 ---------- */
.page-faq .tut-check {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: sync;
}

.page-faq .tut-check-item {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--faq-line-ink);
}

.page-faq .tut-check-item:last-child {
  border-bottom: 1px solid var(--faq-line-ink);
}

.page-faq .tut-check-box {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  padding: 0;
  position: relative;
  border: 1px solid var(--faq-line-ink-strong);
  background: transparent;
  cursor: pointer;
  flex: none;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-faq .tut-check-box:checked {
  border-color: var(--cyan-deep);
  background: rgba(14, 143, 138, 0.14);
}

.page-faq .tut-check-box:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border-right: 2px solid var(--cyan-deep);
  border-bottom: 2px solid var(--cyan-deep);
  transform: rotate(40deg);
}

.page-faq .tut-check-box:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-faq .tut-check-label {
  display: block;
  cursor: pointer;
}

.page-faq .tut-check-title {
  display: block;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-deep);
}

.page-faq .tut-check-text {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 14, 28, 0.78);
}

/* ---------- 06 净胜球示意 ---------- */
.page-faq .tut-goal-demo {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-faq .tut-goal-cell {
  display: grid;
  grid-template-columns: 66px 52px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 14px 14px;
  border: 1px solid var(--faq-line-ink-strong);
  background: rgba(11, 14, 28, 0.04);
}

.page-faq .tut-goal-round {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(11, 14, 28, 0.62);
}

.page-faq .tut-goal-value {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  text-align: right;
  letter-spacing: -0.02em;
}

.page-faq .tut-goal-plus {
  color: #1a9c5c;
}

.page-faq .tut-goal-minus {
  color: var(--magenta);
}

.page-faq .tut-goal-note {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(11, 14, 28, 0.72);
}

/* ---------- 07 折叠问答 ---------- */
.page-faq .tut-faq-group {
  margin: 28px 0 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-faq .tut-faq-group:first-child {
  margin-top: 0;
}

.page-faq .tut-faq-item {
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-left-color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-faq .tut-faq-item[open] {
  border-left-color: var(--orange);
  background: rgba(30, 40, 96, 0.4);
}

.page-faq .tut-faq-q {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 14px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

.page-faq .tut-faq-q::-webkit-details-marker {
  display: none;
}

.page-faq .tut-faq-q::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  transition: transform 240ms var(--ease);
}

.page-faq .tut-faq-item[open] .tut-faq-q::after {
  content: "−";
  transform: rotate(180deg);
}

.page-faq .tut-faq-q:hover {
  color: var(--cyan);
}

.page-faq .tut-faq-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-faq .tut-faq-a {
  padding: 0 14px 20px;
}

.page-faq .tut-faq-a p {
  margin: 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

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

/* ---------- 结尾引导 ---------- */
.page-faq .tut-cta {
  margin-top: 56px;
  padding: 28px 22px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(120deg, rgba(38, 242, 226, 0.08) 0%, rgba(10, 16, 48, 0) 60%),
    var(--ink-900);
}

.page-faq .tut-cta-text {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
}

.page-faq .tut-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-faq .tut-panel {
    padding: 32px 30px;
  }

  .page-faq .tut-validity {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
  }

  .page-faq .tut-flow {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 28px;
    padding: 0;
  }

  .page-faq .tut-flow::before {
    display: none;
  }

  .page-faq .tut-flow-item {
    padding: 22px 0 0;
    border-top: 1px solid var(--faq-line-ink-strong);
  }

  .page-faq .tut-flow-item::before {
    left: 0;
    top: -2px;
    width: 34px;
    height: 3px;
    border: 0;
    border-radius: 0;
    background: var(--cyan-deep);
  }

  .page-faq .tut-flow-item:nth-child(-n + 2) {
    padding-bottom: 24px;
  }
}

@media (min-width: 960px) {
  .page-faq .tut-layout {
    grid-template-columns: var(--faq-index) minmax(0, 1fr);
    gap: var(--faq-gap);
    align-items: start;
    padding-top: 52px;
    padding-bottom: 96px;
  }

  .page-faq .tut-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-faq .tut-index-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-faq .tut-index-link {
    border-bottom: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 9px 10px;
    white-space: normal;
    font-size: 13px;
  }

  .page-faq .tut-index-link[aria-current="true"] {
    border-left-color: var(--cyan);
    border-bottom-color: transparent;
  }

  .page-faq .tut-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 22px;
  }

  .page-faq .tut-flow-item,
  .page-faq .tut-flow-item:nth-child(-n + 2) {
    padding: 22px 0 0;
  }

  .page-faq .tut-goal-cell {
    grid-template-columns: 90px 64px minmax(0, 1fr);
    padding: 16px 20px;
  }

  .page-faq .tut-cta {
    padding: 36px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .tut-sec-no,
  .page-faq .tut-index-link,
  .page-faq .tut-faq-item,
  .page-faq .tut-faq-q::after {
    transition: none;
  }
}