.page-faq {
  position: relative;
  overflow-x: hidden;
  isolation: isolate;
}

.page-faq::before {
  content: "";
  position: absolute;
  inset: -10% -18% auto -18%;
  height: 560px;
  background:
    radial-gradient(50% 60% at 22% 18%, rgba(123, 47, 247, 0.28), transparent 70%),
    radial-gradient(42% 52% at 82% 0%, rgba(0, 229, 255, 0.16), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-faq .faq-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: clamp(16px, 3vw, 28px) clamp(16px, 4vw, 48px) clamp(48px, 7vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-faq .faq-hero {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
  padding-block: clamp(16px, 2.6vw, 32px) clamp(32px, 5vw, 60px);
}

.page-faq .faq-hero-copy {
  min-width: 0;
}

.page-faq .faq-hero h1 {
  margin: 0.18em 0 0.36em;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 6.2vw, 4.35rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--white);
  text-shadow: 0 0 26px rgba(123, 47, 247, 0.5), 0 0 60px rgba(0, 229, 255, 0.16);
}

.page-faq .faq-hero .lede {
  max-width: 56ch;
  color: var(--muted);
  font-size: clamp(0.98rem, 1.6vw, 1.06rem);
  line-height: 1.8;
}

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

.page-faq .faq-hero-facts {
  list-style: none;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.page-faq .faq-fact {
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(20, 28, 46, 0.66);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-faq .faq-fact:hover {
  border-color: rgba(0, 229, 255, 0.42);
  transform: translateY(-2px);
}

.page-faq .faq-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 2.4vw, 1.45rem);
  font-weight: 700;
  color: var(--cyan);
  text-shadow: 0 0 16px rgba(0, 229, 255, 0.5);
}

.page-faq .faq-fact--signal .faq-fact-num {
  color: var(--orange);
  text-shadow: 0 0 16px rgba(255, 122, 0, 0.55);
}

.page-faq .faq-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-faq .faq-hero-visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(123, 47, 247, 0.4);
  background: linear-gradient(150deg, rgba(123, 47, 247, 0.26), rgba(0, 229, 255, 0.1) 65%, rgba(20, 28, 46, 0.9));
  box-shadow: 0 34px 90px -48px rgba(123, 47, 247, 0.95);
}

.page-faq .faq-hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(180deg, rgba(0, 229, 255, 0.07) 0 1px, transparent 1px 5px);
  pointer-events: none;
  mix-blend-mode: screen;
}

.page-faq .faq-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-faq .faq-hero-visual figcaption {
  position: relative;
  z-index: 1;
  padding: 11px 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: rgba(11, 15, 26, 0.78);
}

/* ---------- 问答板 ---------- */
.page-faq .faq-board {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

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

.page-faq .faq-index-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-faq .faq-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-faq .faq-tabs::-webkit-scrollbar {
  height: 4px;
}

.page-faq .faq-tabs::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: var(--radius-pill);
}

.page-faq .faq-tab {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(20, 28, 46, 0.72);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.92rem;
  white-space: nowrap;
  cursor: pointer;
  transition: color 200ms var(--ease), border-color 200ms var(--ease),
    background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-faq .faq-tab:hover {
  color: var(--white);
  border-color: rgba(0, 229, 255, 0.42);
}

.page-faq .faq-tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  box-shadow: inset 0 0 0 2px rgba(255, 122, 0, 0.35);
}

.page-faq .faq-tab[aria-selected="true"] {
  color: var(--white);
  border-color: rgba(0, 229, 255, 0.6);
  background: linear-gradient(120deg, rgba(123, 47, 247, 0.45), rgba(0, 229, 255, 0.16));
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.22), 0 16px 36px -24px rgba(0, 229, 255, 0.95);
}

.page-faq .faq-tab-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0, 229, 255, 0.32);
}

.page-faq .faq-tab[aria-selected="true"] .faq-tab-num {
  color: var(--orange);
  border-color: rgba(255, 122, 0, 0.55);
}

.page-faq .faq-panels {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  min-width: 0;
}

.page-faq .faq-panel-head {
  margin-bottom: clamp(14px, 2vw, 20px);
  padding-left: 14px;
  border-left: 3px solid rgba(123, 47, 247, 0.75);
}

.page-faq .faq-panel-title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: clamp(1.28rem, 2.5vw, 1.75rem);
  line-height: 1.35;
  color: var(--white);
}

.page-faq .faq-panel-sub {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-faq .faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-faq .faq-item {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(20, 28, 46, 0.86), rgba(11, 15, 26, 0.88));
  transition: border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-faq .faq-item:hover {
  border-color: rgba(123, 47, 247, 0.6);
}

.page-faq .faq-item[open] {
  border-color: rgba(0, 229, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.16), 0 26px 56px -40px rgba(0, 229, 255, 0.9);
}

.page-faq .faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px clamp(14px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
  color: var(--white);
  font-size: clamp(0.95rem, 1.6vw, 1rem);
  font-weight: 600;
  line-height: 1.6;
  transition: color 200ms var(--ease);
}

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

.page-faq .faq-item summary:hover {
  color: var(--cyan);
}

.page-faq .faq-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -3px;
  box-shadow: inset 0 0 0 2px rgba(255, 122, 0, 0.32);
}

.page-faq .faq-q-index {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-faq .faq-item summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1.2;
  color: var(--cyan);
  transition: color 200ms var(--ease);
}

.page-faq .faq-item[open] summary::after {
  content: "–";
  color: var(--orange);
}

.page-faq .faq-answer {
  padding: 0 clamp(14px, 2vw, 22px) 18px;
  padding-left: calc(clamp(14px, 2vw, 22px) + 30px);
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.82;
  border-top: 1px solid rgba(43, 53, 80, 0.7);
  margin-top: -1px;
  padding-top: 14px;
}

.page-faq .faq-answer p {
  margin: 0 0 9px;
}

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

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

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

/* ---------- 联系区块 ---------- */
.page-faq .faq-contact {
  display: grid;
  gap: clamp(22px, 3.4vw, 38px);
  margin-top: clamp(40px, 6vw, 76px);
  padding: clamp(22px, 3.4vw, 42px);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 122, 0, 0.34);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(255, 122, 0, 0.16), transparent 62%),
    linear-gradient(160deg, rgba(20, 28, 46, 0.94), rgba(11, 15, 26, 0.96));
  align-items: center;
}

.page-faq .faq-contact-copy {
  min-width: 0;
}

.page-faq .faq-contact-title {
  margin: 0.15em 0 0.4em;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
  text-shadow: 0 0 24px rgba(255, 122, 0, 0.32);
}

.page-faq .faq-contact-text {
  margin: 0 0 20px;
  max-width: 52ch;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.8;
}

.page-faq .faq-contact-mail {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(11, 15, 26, 0.72);
  font-family: var(--font-mono);
  font-size: clamp(0.88rem, 2vw, 1.05rem);
  color: var(--white);
  text-decoration: none;
  word-break: break-all;
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-faq .faq-contact-mail:hover {
  color: var(--cyan);
  border-color: rgba(0, 229, 255, 0.55);
}

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

.page-faq .faq-contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-faq .faq-contact-visual {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 229, 255, 0.28);
  background: linear-gradient(160deg, rgba(0, 229, 255, 0.14), rgba(123, 47, 247, 0.16));
}

.page-faq .faq-contact-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-faq .faq-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-faq .faq-contact {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

@media (min-width: 920px) {
  .page-faq .faq-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

@media (min-width: 960px) {
  .page-faq .faq-board {
    grid-template-columns: 268px minmax(0, 1fr);
    align-items: start;
  }

  .page-faq .faq-index {
    position: sticky;
    top: 24px;
  }

  .page-faq .faq-tabs {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-faq .faq-tab {
    width: 100%;
    justify-content: flex-start;
    padding: 13px 16px;
    border-radius: var(--radius-md);
    white-space: normal;
    text-align: left;
  }

  .page-faq .faq-answer {
    max-width: 68ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .faq-fact,
  .page-faq .faq-item,
  .page-faq .faq-tab,
  .page-faq .faq-item summary,
  .page-faq .faq-contact-mail {
    transition: none;
  }

  .page-faq .faq-fact:hover {
    transform: none;
  }
}