/* ==========================================================
   使用指南 · page-faq
   ========================================================== */

.page-faq {
  position: relative;
  color: var(--paper);
  background:
    radial-gradient(1080px 620px at 10% -8%, rgba(90, 63, 176, 0.30), transparent 64%),
    radial-gradient(880px 520px at 98% 4%, rgba(59, 75, 216, 0.20), transparent 62%),
    var(--ink);
}

.page-faq .mono-label {
  margin: 0;
}

/* ---------------- 首屏 ---------------- */

.page-faq .faq-hero {
  position: relative;
  padding-top: clamp(84px, 12vw, 128px);
}

.page-faq .faq-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: end;
  margin-top: 24px;
}

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

.page-faq .faq-hero__label {
  color: var(--gold);
  letter-spacing: 0.2em;
}

.page-faq .faq-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.3rem, 7.4vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: -0.012em;
  margin: 16px 0 0;
  background: linear-gradient(104deg, var(--paper) 8%, var(--gold-hi) 48%, var(--gold) 78%, var(--gold-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--gold-hi);
}

.page-faq .faq-hero__lede {
  margin-top: 20px;
  max-width: 56ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
}

.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-faq .faq-hero__media {
  margin: 0;
  position: relative;
}

.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid var(--line-gold);
  border-radius: 4px;
  pointer-events: none;
}

.page-faq .faq-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  object-fit: cover;
}

/* ---------------- 阶段导航条 ---------------- */

.page-faq .stage-rail {
  margin-top: clamp(40px, 6vw, 64px);
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

.page-faq .stage-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-gold);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-faq .stage-rail__item {
  background: rgba(6, 6, 10, 0.86);
}

.page-faq .stage-rail__link {
  position: relative;
  display: grid;
  gap: 5px;
  padding: 18px 16px 22px;
  text-decoration: none;
  color: var(--mist);
  transition: background 0.26s var(--ease), color 0.26s var(--ease);
}

.page-faq .stage-rail__link::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: var(--rule-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.32s var(--ease);
}

.page-faq .stage-rail__link:hover,
.page-faq .stage-rail__link:focus-visible {
  background: rgba(212, 164, 76, 0.06);
  color: var(--paper);
}

.page-faq .stage-rail__link:hover::after,
.page-faq .stage-rail__link:focus-visible::after,
.page-faq .stage-rail__link.is-active::after {
  transform: scaleX(1);
}

.page-faq .stage-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-faq .stage-rail__label {
  font-family: var(--font-display);
  font-size: 1.06rem;
  line-height: 1.3;
  color: inherit;
}

.page-faq .stage-rail__hint {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(167, 162, 180, 0.78);
}

/* ---------------- 阶段通用 ---------------- */

.page-faq .faq-stage {
  padding-top: clamp(68px, 9vw, 108px);
}

.page-faq .faq-stage:last-of-type {
  padding-bottom: clamp(72px, 10vw, 120px);
}

.page-faq .stage-head {
  position: relative;
  padding-left: 18px;
  border-left: 1px solid var(--line-gold);
}

.page-faq .stage-head__num {
  display: block;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-faq .stage-head__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--paper);
  margin: 0;
}

.page-faq .stage-head__note {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------------- 步骤轨道 ---------------- */

.page-faq .step-rail {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
}

.page-faq .step-rail__item {
  position: relative;
  padding: 0 0 36px 58px;
}

.page-faq .step-rail__item::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 48px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(180deg, rgba(212, 164, 76, 0.42), rgba(212, 164, 76, 0.04));
}

.page-faq .step-rail__item:last-child {
  padding-bottom: 0;
}

.page-faq .step-rail__item:last-child::before {
  display: none;
}

.page-faq .step-rail__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(212, 164, 76, 0.38);
  background: var(--ink-2);
  color: var(--gold-hi);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-faq .step-rail__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.08rem, 2.4vw, 1.3rem);
  line-height: 1.42;
  color: var(--paper);
  margin: 6px 0 10px;
}

.page-faq .step-rail__item p {
  margin: 0 0 10px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 64ch;
}

.page-faq .step-rail__item .step-rail__expect {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  margin: 14px 0 0;
  padding: 13px 16px;
  border-left: 2px solid rgba(38, 198, 166, 0.62);
  border-radius: 0 3px 3px 0;
  background: rgba(38, 198, 166, 0.065);
  color: #cbe7e0;
  font-size: 14px;
  line-height: 1.72;
}

.page-faq .faq-dot {
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(38, 198, 166, 0.16);
}

/* ---------------- 走错提示 ---------------- */

.page-faq .faq-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 5px 11px;
  border-radius: 2px;
  border: 1px solid currentColor;
}

.page-faq .faq-tag--alert {
  color: #f09bc8;
  background: rgba(224, 57, 143, 0.1);
}

.page-faq .pitfall {
  margin-top: 34px;
  padding: 22px 22px 8px;
  border: 1px solid rgba(224, 57, 143, 0.3);
  border-radius: 4px;
  background: linear-gradient(180deg, rgba(224, 57, 143, 0.085), rgba(224, 57, 143, 0.015));
}

.page-faq .pitfall__tag {
  margin: 0 0 14px;
}

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

.page-faq .pitfall__list li {
  position: relative;
  padding: 0 0 16px 18px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.82;
  max-width: 62ch;
}

.page-faq .pitfall__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--magenta);
}

.page-faq .pitfall__list strong {
  color: var(--paper);
  font-weight: 600;
}

/* ---------------- 日常访问 ---------------- */

.page-faq .routine {
  margin: 40px 0 0;
  display: grid;
  gap: 1px;
  background: var(--line-gold);
  border-top: 1px solid var(--line-gold);
}

.page-faq .routine__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 0;
  background: rgba(15, 16, 24, 0.86);
}

.page-faq .routine__key {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--gold-hi);
}

.page-faq .routine__val {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  max-width: 66ch;
}

/* ---------------- 异常排查三步 ---------------- */

.page-faq .triage {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-gold);
  border: 1px solid var(--line-gold);
  border-radius: 4px;
  overflow: hidden;
}

.page-faq .triage__item {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--ink-2);
}

.page-faq .triage__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(212, 164, 76, 0.36);
  margin-bottom: 16px;
}

.page-faq .triage__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  line-height: 1.42;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-faq .triage__item p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.82;
}

.page-faq .triage__item .triage__expect {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed rgba(38, 198, 166, 0.28);
  color: #b9ded5;
  font-size: 14px;
}

.page-faq .triage__more {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--line-gold);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.82;
  max-width: 70ch;
}

/* ---------------- 升级检查清单 ---------------- */

.page-faq .upgrade-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 40px;
  align-items: start;
}

.page-faq .checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-faq .check {
  position: relative;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 18px 18px 16px;
  border: 1px solid var(--line-gold);
  border-radius: 4px;
  background: rgba(15, 16, 24, 0.72);
  cursor: pointer;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-faq .check:hover {
  border-color: rgba(212, 164, 76, 0.44);
}

.page-faq .check__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip-path: inset(50%);
}

.page-faq .check__box {
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border-radius: 50%;
  border: 1px solid rgba(212, 164, 76, 0.5);
  display: grid;
  place-items: center;
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-faq .check__box::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  transform: scale(0);
  transition: transform 0.22s var(--ease);
}

.page-faq .check__input:checked ~ .check__box {
  border-color: var(--teal);
  box-shadow: 0 0 0 4px rgba(38, 198, 166, 0.15);
}

.page-faq .check__input:checked ~ .check__box::after {
  transform: scale(1);
}

.page-faq .check__input:focus-visible ~ .check__box {
  outline: 2px solid var(--gold-hi);
  outline-offset: 3px;
}

.page-faq .check__text {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  transition: color 0.22s var(--ease);
}

.page-faq .check__text strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
  font-size: 15px;
  color: var(--paper);
  transition: color 0.22s var(--ease);
}

.page-faq .check__input:checked ~ .check__text {
  color: rgba(167, 162, 180, 0.7);
}

.page-faq .check__input:checked ~ .check__text strong {
  color: rgba(242, 236, 225, 0.72);
}

.page-faq .upgrade-media {
  margin: 0;
  position: relative;
}

.page-faq .upgrade-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid var(--line-gold);
  object-fit: cover;
}

/* ---------------- 常见问题折叠 ---------------- */

.page-faq .qa-list {
  margin-top: 38px;
  border-top: 1px solid var(--line-gold);
}

.page-faq .qa {
  border-bottom: 1px solid var(--line-gold);
  transition: background 0.26s var(--ease);
}

.page-faq .qa[open] {
  background: rgba(25, 27, 38, 0.7);
}

.page-faq .qa__q {
  position: relative;
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 19px 52px 19px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--paper);
  transition: color 0.22s var(--ease);
}

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

.page-faq .qa__q::marker {
  content: "";
}

.page-faq .qa__q:hover {
  color: var(--gold-hi);
}

.page-faq .qa__q::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--gold);
  transition: color 0.22s var(--ease);
}

.page-faq .qa[open] .qa__q::after {
  content: "\2013";
  color: var(--gold-hi);
}

.page-faq .qa__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(212, 164, 76, 0.62);
  padding-top: 4px;
}

.page-faq .qa__a {
  padding: 0 24px 22px 44px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}

.page-faq .qa__a p {
  margin: 0;
  max-width: 68ch;
}

/* ---------------- 兜底卡片 ---------------- */

.page-faq .fallback {
  position: relative;
  padding: clamp(38px, 6vw, 68px) clamp(22px, 4vw, 56px);
  border: 1px solid var(--line-gold);
  border-radius: 6px;
  background:
    radial-gradient(620px 320px at 84% -4%, rgba(90, 63, 176, 0.38), transparent 68%),
    radial-gradient(520px 300px at 4% 108%, rgba(59, 75, 216, 0.24), transparent 66%),
    var(--ink-2);
  overflow: hidden;
}

.page-faq .fallback::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 68px;
  border-top: 1px solid rgba(212, 164, 76, 0.55);
  border-left: 1px solid rgba(212, 164, 76, 0.55);
  pointer-events: none;
}

.page-faq .fallback__label {
  color: var(--gold);
}

.page-faq .fallback__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.4vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 16px 0 0;
  max-width: 22ch;
}

.page-faq .fallback__lede {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}

.page-faq .fallback__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 32px;
  background: var(--line-gold);
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

.page-faq .fallback__item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  background: var(--ink-2);
  min-width: 0;
}

.page-faq .fallback__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-faq .fallback__val {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.22rem);
  line-height: 1.4;
  color: var(--paper);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-faq .fallback__hint {
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

.page-faq .copy-btn {
  justify-self: start;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  background: transparent;
  border: 1px solid rgba(212, 164, 76, 0.4);
  border-radius: 2px;
  padding: 7px 13px;
  cursor: pointer;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-faq .copy-btn:hover,
.page-faq .copy-btn:focus-visible {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-faq .fallback__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 760px) {
  .page-faq .stage-rail__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-faq .qa__a {
    padding-left: 48px;
    padding-right: 52px;
  }

  .page-faq .routine__row {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
    padding: 24px 0;
  }
}

@media (min-width: 820px) {
  .page-faq .triage {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-faq .faq-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
  }

  .page-faq .faq-hero__media {
    transform: translateY(-18px);
  }

  .page-faq .upgrade-grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    gap: 44px;
  }

  .page-faq .step-rail__item {
    padding-left: 74px;
  }

  .page-faq .step-rail__item::before {
    left: 20px;
  }
}

@media (min-width: 1180px) {
  .page-faq .stage-rail__link {
    padding: 22px 20px 26px;
  }

  .page-faq .stage-rail__label {
    font-size: 1.14rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .stage-rail__link,
  .page-faq .stage-rail__link::after,
  .page-faq .check,
  .page-faq .check__box,
  .page-faq .check__box::after,
  .page-faq .check__text,
  .page-faq .check__text strong,
  .page-faq .qa,
  .page-faq .qa__q,
  .page-faq .qa__q::after,
  .page-faq .copy-btn {
    transition: none;
  }
}