/* ===== 教程中心 page-faq ===== */
.page-faq {
  --faq-hair: rgba(154, 168, 204, 0.22);
  --faq-hair-strong: rgba(53, 227, 220, 0.42);
  --faq-sticky: 78px;
  --faq-radius-lg: 26px;
  display: block;
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-faq .nx-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: clamp(18px, 3vw, 26px) 0 0;
  font-size: 13px;
  color: var(--nx-slate);
}

.page-faq .nx-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-faq .nx-breadcrumb__item + .nx-breadcrumb__item::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--nx-line);
}

.page-faq .nx-breadcrumb__link {
  color: var(--nx-text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.24s ease, border-color 0.24s ease;
}

.page-faq .nx-breadcrumb__link:hover,
.page-faq .nx-breadcrumb__link:focus-visible {
  color: var(--nx-cyan);
  border-bottom-color: var(--nx-cyan);
}

.page-faq .nx-breadcrumb__current {
  color: var(--nx-cyan-soft);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.faq-hero {
  padding-top: clamp(30px, 5vw, 62px);
  padding-bottom: clamp(36px, 5vw, 66px);
  position: relative;
}

.faq-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--faq-hair-strong), transparent);
  opacity: 0.7;
}

.faq-hero__title {
  max-width: 860px;
  margin-top: 14px;
}

.faq-hero__lede {
  max-width: 720px;
  margin-top: 20px;
}

.faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.faq-hero__facts {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: clamp(20px, 3vw, 28px) clamp(18px, 3vw, 32px);
  display: grid;
  gap: 18px;
  border: 1px solid var(--faq-hair);
  border-radius: var(--faq-radius-lg);
  background:
    radial-gradient(120% 160% at 8% 0%, rgba(107, 63, 224, 0.26), transparent 58%),
    linear-gradient(150deg, rgba(19, 28, 69, 0.9), rgba(10, 17, 48, 0.45));
}

.faq-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  color: var(--nx-text-dim);
  font-size: 15px;
  line-height: 1.6;
}

.faq-hero__factnum {
  color: var(--nx-cyan);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* ---------- 两步上手 ---------- */
.faq-steps {
  padding-top: clamp(40px, 6vw, 78px);
  padding-bottom: clamp(40px, 6vw, 78px);
}

.faq-steps__head {
  max-width: 760px;
}

.faq-steps__intro {
  margin-top: 16px;
  color: var(--nx-text-dim);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
}

.faq-track {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  position: relative;
}

.faq-track__item {
  position: relative;
  z-index: 1;
  padding: clamp(24px, 3.4vw, 36px);
  border: 1px solid var(--faq-hair);
  border-radius: var(--nx-r-card);
  background:
    linear-gradient(160deg, rgba(19, 28, 69, 0.94), rgba(10, 17, 48, 0.62));
  transition: border-color 0.32s ease, transform 0.32s ease, box-shadow 0.32s ease;
}

.faq-track__item:hover {
  border-color: var(--faq-hair-strong);
  transform: translateY(-3px);
  box-shadow: var(--nx-shadow);
}

.faq-track__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: var(--nx-r-pill);
  background: linear-gradient(140deg, rgba(107, 63, 224, 0.95), rgba(53, 227, 220, 0.95));
  color: var(--nx-deep);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  box-shadow: 0 12px 30px -14px rgba(53, 227, 220, 0.72);
}

.faq-track__title {
  margin-top: 18px;
  color: var(--nx-text);
}

.faq-track__text {
  margin-top: 12px;
  color: var(--nx-text-dim);
  font-size: 16px;
  line-height: 1.75;
}

.faq-track__points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.faq-track__points li {
  position: relative;
  padding-left: 20px;
  color: var(--nx-text-dim);
  font-size: 14.5px;
  line-height: 1.7;
}

.faq-track__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nx-cyan);
  box-shadow: 0 0 0 3px rgba(53, 227, 220, 0.16);
}

.faq-figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

.page-faq .faq-figure .nx-figure__media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--nx-r-card);
  object-fit: cover;
}

/* ---------- 常见问题 ---------- */
.faq-qa {
  padding-top: clamp(6px, 2vw, 18px);
  padding-bottom: clamp(40px, 6vw, 78px);
}

.faq-qa__head {
  max-width: 720px;
}

.faq-qa__intro {
  margin-top: 14px;
  color: var(--nx-text-dim);
  font-size: 16px;
  line-height: 1.75;
}

.faq-tabs {
  position: sticky;
  top: var(--faq-sticky);
  z-index: 6;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(26px, 4vw, 40px) 0 clamp(24px, 3vw, 36px);
  padding: 10px;
  border: 1px solid var(--faq-hair);
  border-radius: 24px;
  background: rgba(10, 17, 48, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.faq-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid transparent;
  border-radius: var(--nx-r-pill);
  background: rgba(154, 168, 204, 0.1);
  color: var(--nx-text-dim);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.24s ease, color 0.24s ease, border-color 0.24s ease;
}

.faq-tab:hover,
.faq-tab:focus-visible {
  background: var(--nx-cyan);
  border-color: var(--nx-cyan);
  color: var(--nx-deep);
}

.faq-tab__count {
  padding: 1px 8px;
  border-radius: var(--nx-r-pill);
  background: rgba(53, 227, 220, 0.16);
  color: var(--nx-cyan-soft);
  font-size: 12px;
  font-weight: 700;
}

.faq-tab:hover .faq-tab__count,
.faq-tab:focus-visible .faq-tab__count {
  background: rgba(10, 17, 48, 0.2);
  color: var(--nx-deep);
}

.faq-groups {
  display: grid;
  gap: clamp(30px, 4.4vw, 52px);
}

.faq-group {
  scroll-margin-top: 150px;
}

.faq-group__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--faq-hair);
}

.faq-group__head .nx-h3 {
  margin: 0;
  color: var(--nx-text);
}

.faq-group__tag {
  margin-left: auto;
  padding: 4px 12px;
  border: 1px solid var(--faq-hair);
  border-radius: var(--nx-r-pill);
  color: var(--nx-slate);
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.faq-item {
  position: relative;
  margin-bottom: 10px;
  border: 1px solid var(--faq-hair);
  border-radius: 18px;
  background: linear-gradient(150deg, rgba(19, 28, 69, 0.55), rgba(10, 17, 48, 0.34));
  overflow: hidden;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(53, 227, 220, 0.3);
}

.faq-item[open] {
  border-color: var(--faq-hair-strong);
  background: linear-gradient(150deg, rgba(19, 28, 69, 0.86), rgba(10, 17, 48, 0.5));
}

.faq-item[open]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--nx-violet), var(--nx-cyan));
}

.faq-item__q {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px 16px 22px;
  color: var(--nx-text);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  transition: color 0.24s ease;
}

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

.faq-item__q:hover {
  color: var(--nx-cyan-soft);
}

.faq-item__q:focus-visible {
  outline: 2px solid var(--nx-cyan);
  outline-offset: -3px;
  border-radius: 18px;
}

.faq-item__q::after {
  content: "+";
  margin-left: auto;
  flex: none;
  color: var(--nx-cyan);
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.3s ease;
}

.faq-item[open] .faq-item__q::after {
  transform: rotate(45deg);
}

.faq-item__a {
  padding: 0 22px 20px 22px;
  animation: faqReveal 0.28s ease both;
}

.faq-item__a p {
  margin: 0;
  color: var(--nx-text-dim);
  font-size: 15px;
  line-height: 1.78;
}

.faq-item__verdict {
  color: var(--nx-cyan-soft);
  font-weight: 700;
}

@keyframes faqReveal {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 容量与分组 ---------- */
.faq-rules {
  position: relative;
  overflow: hidden;
}

.faq-rules::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -140px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(107, 63, 224, 0.34), transparent 68%);
  pointer-events: none;
}

.faq-rules__lead {
  max-width: 680px;
  position: relative;
  z-index: 1;
}

.faq-rules__intro {
  margin-top: 16px;
  color: var(--nx-text-dim);
  font-size: 16px;
  line-height: 1.78;
}

.faq-rules__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
}

.faq-rulecard {
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--faq-hair);
  border-radius: var(--nx-r-card);
  background: rgba(10, 17, 48, 0.55);
  transition: transform 0.32s ease, border-color 0.32s ease;
}

.faq-rulecard:hover {
  transform: translateY(-3px);
  border-color: var(--faq-hair-strong);
}

.faq-rulecard__num {
  display: block;
  color: var(--nx-amber);
  font-size: clamp(38px, 5vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
}

.faq-rulecard__title {
  margin-top: 14px;
  color: var(--nx-text);
}

.faq-rulecard__text {
  margin-top: 10px;
  color: var(--nx-text-dim);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 阅读与提醒 ---------- */
.faq-alerts {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-top: clamp(42px, 6vw, 80px);
  padding-bottom: clamp(42px, 6vw, 80px);
}

.faq-alerts__copy {
  max-width: 620px;
}

.faq-alerts__text {
  margin-top: 16px;
  color: var(--nx-text-dim);
  font-size: 16px;
  line-height: 1.78;
}

.faq-alerts__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.faq-alerts__list li {
  position: relative;
  padding-left: 22px;
  color: var(--nx-text-dim);
  font-size: 15px;
  line-height: 1.7;
}

.faq-alerts__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--nx-violet), var(--nx-cyan));
}

.faq-alerts__copy .nx-btn {
  margin-top: 26px;
}

.faq-alerts__mock {
  align-self: start;
  padding: 20px;
  border: 1px solid var(--faq-hair);
  border-radius: var(--faq-radius-lg);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(53, 227, 220, 0.16), transparent 60%),
    linear-gradient(160deg, rgba(19, 28, 69, 0.92), rgba(10, 17, 48, 0.6));
  display: grid;
  gap: 14px;
}

.faq-mock__bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-hair);
}

.faq-mock__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(154, 168, 204, 0.4);
}

.faq-mock__dot:first-child {
  background: var(--nx-amber);
}

.faq-mock__label {
  margin-left: auto;
  color: var(--nx-slate);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.faq-mock__group {
  display: grid;
  gap: 8px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(10, 17, 48, 0.6);
  border: 1px solid rgba(154, 168, 204, 0.14);
}

.faq-mock__grouptitle {
  color: var(--nx-text);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.faq-mock__line {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--nx-text-dim);
  font-size: 13.5px;
  line-height: 1.5;
}

.faq-mock__pip {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nx-slate);
}

.faq-mock__pip--live {
  background: var(--nx-live);
  box-shadow: 0 0 0 3px rgba(75, 227, 155, 0.18);
}

.faq-mock__pip--off {
  background: rgba(154, 168, 204, 0.34);
}

/* ---------- 术语对照 ---------- */
.faq-terms .nx-eyebrow {
  color: var(--nx-paper-dim);
}

.faq-terms__head {
  max-width: 660px;
}

.faq-terms__title {
  color: var(--nx-paper-ink);
  margin-top: 12px;
}

.faq-terms__intro {
  margin-top: 16px;
  color: var(--nx-paper-dim);
  font-size: 16px;
  line-height: 1.78;
}

.faq-terms__body {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(28px, 4vw, 44px);
}

.faq-tablewrap {
  overflow-x: auto;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(18, 22, 42, 0.1);
}

.faq-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 15px;
  color: var(--nx-paper-ink);
}

.faq-table__caption {
  text-align: left;
  padding: 16px 18px 4px;
  color: var(--nx-paper-dim);
  font-size: 12.5px;
  letter-spacing: 0.08em;
}

.faq-table th,
.faq-table td {
  text-align: left;
  vertical-align: top;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(18, 22, 42, 0.12);
  line-height: 1.7;
}

.faq-table thead th {
  color: var(--nx-paper-dim);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-bottom-color: rgba(18, 22, 42, 0.24);
}

.faq-table tbody th {
  color: var(--nx-ink);
  font-weight: 700;
  white-space: nowrap;
}

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

.faq-table tbody tr:hover {
  background: rgba(53, 227, 220, 0.12);
}

.faq-terms__figure {
  margin: 0;
}

.page-faq .faq-terms__figure .nx-figure__media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--nx-r-card);
  object-fit: cover;
}

.page-faq .faq-terms__figure .nx-figure__caption {
  color: var(--nx-paper-dim);
}

/* ---------- 仍未解决 ---------- */
.faq-help {
  padding-top: clamp(42px, 6vw, 80px);
}

.faq-help__card {
  position: relative;
  padding: clamp(28px, 4.4vw, 52px);
  border: 1px solid var(--faq-hair);
  border-radius: var(--faq-radius-lg);
  overflow: hidden;
  background:
    radial-gradient(120% 150% at 0% 0%, rgba(107, 63, 224, 0.34), transparent 60%),
    radial-gradient(100% 140% at 100% 100%, rgba(53, 227, 220, 0.2), transparent 62%),
    linear-gradient(150deg, rgba(19, 28, 69, 0.95), rgba(10, 17, 48, 0.7));
}

.faq-help__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  height: 2px;
  background: var(--nx-glow-vc);
}

.faq-help__card .nx-h2 {
  max-width: 620px;
  margin-top: 12px;
  color: var(--nx-text);
}

.faq-help__text {
  max-width: 700px;
  margin-top: 16px;
  color: var(--nx-text-dim);
  font-size: 16px;
  line-height: 1.78;
}

.faq-help__mail {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border-radius: var(--nx-r-pill);
  border: 1px solid var(--faq-hair-strong);
  background: rgba(10, 17, 48, 0.6);
  color: var(--nx-cyan-soft);
  font-size: 14.5px;
  word-break: break-all;
}

.faq-help__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 32px);
}

/* ---------- 悬浮索引 ---------- */
.faq-backtop {
  position: fixed;
  right: clamp(14px, 3vw, 26px);
  bottom: clamp(16px, 3vw, 30px);
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--faq-hair-strong);
  border-radius: var(--nx-r-pill);
  background: rgba(19, 28, 69, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--nx-cyan-soft);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 18px 40px -22px rgba(4, 8, 26, 0.95);
  transition: transform 0.28s ease, border-color 0.28s ease, color 0.28s ease;
}

.faq-backtop:hover,
.faq-backtop:focus-visible {
  transform: translateY(-2px);
  border-color: var(--nx-cyan);
  color: var(--nx-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .faq-hero__facts {
    grid-template-columns: repeat(3, 1fr);
    align-items: center;
  }

  .faq-hero__facts li {
    padding-left: 22px;
    border-left: 1px solid var(--faq-hair);
  }

  .faq-hero__facts li:first-child {
    padding-left: 0;
    border-left: none;
  }

  .faq-rules__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .faq-terms__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 920px) {
  .faq-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(44px, 7vw, 96px);
  }

  .faq-track::before {
    content: "";
    position: absolute;
    left: 16%;
    right: 16%;
    top: 20px;
    height: 74px;
    border-top: 2px dashed var(--faq-hair-strong);
    border-radius: 50%;
    pointer-events: none;
    opacity: 0.85;
  }

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

  .faq-alerts__mock {
    position: sticky;
    top: calc(var(--faq-sticky) + 72px);
  }
}

@media (max-width: 600px) {
  .page-faq {
    --faq-sticky: 66px;
  }

  .faq-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .faq-tabs::-webkit-scrollbar {
    display: none;
  }

  .faq-item__q {
    font-size: 15px;
    padding: 15px 16px 15px 18px;
  }

  .faq-item__a {
    padding: 0 18px 18px 18px;
  }

  .faq-backtop span {
    display: none;
  }

  .faq-backtop {
    padding: 11px;
    border-radius: 50%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-track__item,
  .page-faq .faq-rulecard,
  .page-faq .faq-backtop,
  .page-faq .faq-item__q::after {
    transition: none !important;
    transform: none !important;
  }

  .page-faq .faq-item__a {
    animation: none !important;
  }
}