.page-faq {
  --faq-tree-line: rgba(0, 229, 255, 0.45);
  --faq-accent-glow: rgba(255, 107, 0, 0.16);
  font-family: var(--font-body);
}

/* ---------- 页面头部 ---------- */
.page-faq__head {
  padding-top: 2.25rem;
  padding-bottom: 1.75rem;
}
.page-faq__head .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0 0 1.4rem;
  font-size: 0.9rem;
}
.page-faq__head .breadcrumb li + li::before {
  content: "/";
  margin: 0 0.65rem;
  color: var(--c-accent);
  font-weight: 700;
}
.page-faq__head .breadcrumb a {
  color: var(--c-cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.page-faq__head .breadcrumb a:hover {
  border-bottom-color: var(--c-cyan-deep);
}
.page-faq__head .breadcrumb [aria-current="page"] {
  color: var(--c-gray);
}
.page-faq__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-primary);
  line-height: 1.1;
  margin: 0 0 0.75rem;
}
.page-faq__subtitle {
  color: var(--c-gray);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 52ch;
  margin: 0;
}
.page-faq__head::after {
  content: "";
  display: block;
  width: 88px;
  height: 6px;
  margin-top: 1.6rem;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-cyan) 100%);
}

/* ---------- 技能树分类 ---------- */
.page-faq__tree {
  background: var(--c-primary);
  border: 2px solid var(--c-primary);
  box-shadow: 8px 8px 0 rgba(10, 31, 68, 0.22);
  padding: 1.75rem 1.25rem;
  position: relative;
  margin-bottom: 2.5rem;
  overflow: hidden;
}
.page-faq__tree::after {
  content: "FAQ";
  position: absolute;
  right: -18px;
  bottom: -28px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 6rem;
  line-height: 1;
  color: rgba(255, 107, 0, 0.16);
  pointer-events: none;
  transform: rotate(-12deg);
  z-index: 0;
}
.page-faq__tree-head {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}
.page-faq__tree .section-kicker {
  color: var(--c-cyan);
}
.page-faq__tree-title {
  color: var(--c-light);
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  margin: 0;
}
.page-faq__tree-body {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding-left: 2.75rem;
}
.page-faq__tree-body::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--faq-tree-line) 0 6px, transparent 6px 12px);
}
.page-faq__branch {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-left: 3px solid var(--c-cyan);
  color: var(--c-light);
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.page-faq__branch::before {
  content: "";
  position: absolute;
  left: -2.75rem;
  top: 50%;
  width: 2.75rem;
  height: 2px;
  background: var(--faq-tree-line);
}
.page-faq__branch:hover {
  background: var(--faq-accent-glow);
  border-color: var(--c-accent);
  border-left-color: var(--c-accent);
  transform: translateX(6px);
}
.page-faq__branch-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.4rem;
  color: var(--c-accent);
  line-height: 1;
}
.page-faq__branch-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.page-faq__branch-text strong {
  font-size: 1rem;
  color: var(--c-light);
}
.page-faq__branch-text small {
  font-size: 0.8rem;
  color: rgba(245, 247, 250, 0.65);
}
.page-faq__branch-count {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--c-cyan);
  border: 1px solid rgba(0, 229, 255, 0.4);
  padding: 0.25rem 0.6rem;
  white-space: nowrap;
}

/* ---------- 主内容双栏 ---------- */
.page-faq__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-bottom: 3rem;
}
.page-faq__main {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  min-width: 0;
}
.page-faq__aside {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 0;
}

/* ---------- FAQ 手风琴 ---------- */
.page-faq__section .section-head {
  margin-bottom: 1.25rem;
}
.page-faq__section-lead {
  color: var(--c-gray);
  line-height: 1.7;
  margin: 0 0 1rem;
}
.page-faq__item {
  list-style: none;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-primary);
  background: #ffffff;
  margin: 0 0 0.75rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.page-faq__item[open] {
  border-left-color: var(--c-accent);
  box-shadow: var(--shadow);
}
.page-faq__item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
  padding: 1rem 1.1rem;
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--c-primary);
  transition: color 0.2s;
}
.page-faq__item summary::-webkit-details-marker {
  display: none;
}
.page-faq__item summary:hover {
  color: var(--c-accent);
}
.page-faq__item summary:focus-visible {
  outline: 3px solid var(--c-cyan);
  outline-offset: -3px;
}
.page-faq__item summary::after {
  content: "+";
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 1.6rem;
  height: 1.6rem;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--c-accent);
  border: 2px solid var(--c-accent);
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.page-faq__item[open] summary::after {
  transform: rotate(45deg);
  background: var(--c-accent);
  color: #ffffff;
}
.page-faq__answer {
  padding: 0.2rem 1.1rem 1.1rem;
  border-top: 1px dashed var(--c-border);
  color: var(--c-dark);
  line-height: 1.75;
  font-size: 0.94rem;
}
.page-faq__answer p {
  margin: 0.75rem 0 0;
}
.page-faq__answer a {
  color: var(--c-cyan-deep);
  text-decoration: underline;
}
.page-faq__answer a:hover {
  color: var(--c-accent);
}
.page-faq__item--mini {
  margin-bottom: 0.5rem;
}
.page-faq__item--mini summary {
  padding: 0.8rem 1rem;
  font-size: 0.92rem;
}
.page-faq__item--mini .page-faq__answer {
  padding: 0.15rem 1rem 0.9rem;
  font-size: 0.9rem;
}
.page-faq__browser-note {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(0, 229, 255, 0.08);
  border-left: 4px solid var(--c-cyan-deep);
  color: var(--c-gray);
  font-size: 0.9rem;
  line-height: 1.6;
}
.page-faq__browser-note p {
  margin: 0;
}
.page-faq__accordion-mini {
  margin-top: 1.25rem;
}

/* ---------- 辅助栏 ---------- */
.page-faq__aside-card {
  background: var(--c-light);
  border: 1px solid var(--c-border);
  padding: 1.25rem;
}
.page-faq__aside-card h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--c-primary);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--c-accent);
}
.page-faq__aside-card--tree ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-faq__aside-card--tree li + li {
  border-top: 1px solid var(--c-border);
}
.page-faq__aside-card--tree a {
  display: block;
  padding: 0.65rem 0;
  color: var(--c-dark);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s, padding-left 0.2s;
}
.page-faq__aside-card--tree a:hover {
  color: var(--c-accent);
  padding-left: 0.5rem;
}
.page-faq__aside-figure {
  margin: 0;
  border: 2px solid var(--c-primary);
  box-shadow: 6px 6px 0 var(--c-primary);
  background: var(--c-light);
}
.page-faq__aside-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-faq__aside-cta {
  text-align: center;
}

/* ---------- 排查步骤 ---------- */
.page-faq__trouble {
  background: var(--c-primary);
  color: var(--c-light);
  padding: 3rem 0;
  position: relative;
  overflow: hidden;
}
.page-faq__trouble::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 220px;
  height: 220px;
  background: linear-gradient(135deg, transparent 48%, rgba(0, 229, 255, 0.14) 49%, rgba(0, 229, 255, 0.14) 51%, transparent 52%);
  transform: rotate(12deg);
}
.page-faq__trouble .section-kicker,
.page-faq__trouble-intro .section-kicker {
  color: var(--c-cyan);
}
.page-faq__trouble-intro h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--c-light);
  margin: 0.25rem 0 0.75rem;
}
.page-faq__trouble-intro p {
  color: rgba(245, 247, 250, 0.8);
  line-height: 1.75;
  max-width: 56ch;
}
.page-faq__trouble-figure {
  margin: 1.5rem 0 0;
  border: 2px solid rgba(0, 229, 255, 0.5);
  background: rgba(255, 255, 255, 0.04);
}
.page-faq__trouble-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-faq__trouble-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-faq__trouble-wizard {
  background: var(--c-light);
  color: var(--c-dark);
  padding: 1.5rem;
  border: 2px solid var(--c-primary);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.25);
  position: relative;
}

/* ---------- 步骤 Wizard ---------- */
.page-faq .trouble-wizard__radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.page-faq .trouble-wizard__label {
  float: left;
  width: calc((100% - 1rem) / 3);
  margin-right: 0.5rem;
  padding: 0.75rem 0.5rem;
  text-align: center;
  font-weight: 700;
  font-size: 0.85rem;
  line-height: 1.3;
  color: var(--c-gray);
  border: 2px solid var(--c-border);
  border-bottom: 3px solid var(--c-border);
  background: #ffffff;
  cursor: pointer;
  box-sizing: border-box;
  transition: all 0.2s ease;
}
.page-faq .trouble-wizard__label:hover {
  color: var(--c-accent);
  border-color: var(--c-accent);
}
.page-faq .trouble-wizard__label:last-of-type {
  margin-right: 0;
}
.page-faq .trouble-wizard__radio:checked + .trouble-wizard__label {
  color: #ffffff;
  background: var(--c-accent);
  border-color: var(--c-accent);
  border-bottom-color: var(--c-primary);
  box-shadow: inset 0 -3px 0 var(--c-primary);
}
.page-faq .trouble-wizard__radio:focus-visible + .trouble-wizard__label {
  outline: 3px solid var(--c-cyan);
  outline-offset: 2px;
}
.page-faq .trouble-wizard__panel {
  clear: both;
  display: none;
  padding-top: 1.25rem;
  margin-top: 0.25rem;
  border-top: 2px dashed var(--c-border);
}
.page-faq #tw-step-1:checked ~ .tw-panel--1,
.page-faq #tw-step-2:checked ~ .tw-panel--2,
.page-faq #tw-step-3:checked ~ .tw-panel--3 {
  display: block;
  animation: page-faq-panel-in 0.3s ease;
}
.page-faq .trouble-wizard__stepnum {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--c-accent);
}
.page-faq .trouble-wizard__panel h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--c-primary);
  margin: 0 0 0.85rem;
}
.page-faq .trouble-wizard__panel ol {
  margin: 0;
  padding-left: 1.4rem;
  display: grid;
  gap: 0.6rem;
}
.page-faq .trouble-wizard__panel li {
  line-height: 1.7;
  font-size: 0.94rem;
}
.page-faq .trouble-wizard__panel li::marker {
  color: var(--c-accent);
  font-weight: 700;
}

@keyframes page-faq-panel-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 联系支持 ---------- */
.page-faq__contact {
  background: var(--c-light);
  border-top: 4px solid var(--c-primary);
  border-bottom: 4px solid var(--c-accent);
  padding: 3rem 0;
  margin-top: 2rem;
}
.page-faq__contact-inner {
  display: grid;
  gap: 2rem;
}
.page-faq__contact h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--c-primary);
  margin: 0.25rem 0 0.75rem;
}
.page-faq__contact p {
  color: var(--c-gray);
  line-height: 1.7;
  max-width: 60ch;
}
.page-faq__contact-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.5rem 0 0;
}
.page-faq__contact-list div {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: #ffffff;
  border-left: 4px solid var(--c-accent);
  box-shadow: 4px 4px 0 rgba(10, 31, 68, 0.08);
}
.page-faq__contact-list dt {
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--c-primary);
  white-space: nowrap;
}
.page-faq__contact-list dd {
  margin: 0;
  font-weight: 700;
  color: var(--c-dark);
  font-size: 0.98rem;
  word-break: break-all;
}
.page-faq__contact-action {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}
.page-faq__contact-tip {
  font-size: 0.85rem;
  color: var(--c-gray);
}

/* ---------- 响应式：平板与桌面 ---------- */
@media (min-width: 768px) {
  .page-faq__head {
    padding-top: 3rem;
    padding-bottom: 2rem;
  }
  .page-faq__tree {
    padding: 2.25rem 2.5rem 2.5rem;
  }
  .page-faq__tree-body {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  .page-faq__contact-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 992px) {
  .page-faq__layout {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }
  .page-faq__aside {
    position: sticky;
    top: 2rem;
  }
  .page-faq__trouble-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    align-items: start;
  }
  .page-faq__contact-inner {
    grid-template-columns: 2fr 1fr;
    align-items: center;
  }
}

/* ---------- 响应式：窄屏步骤折叠 ---------- */
@media (max-width: 720px) {
  .page-faq .trouble-wizard__label {
    float: none;
    width: 100%;
    margin-right: 0;
    margin-bottom: 0.5rem;
  }
  .page-faq .trouble-wizard__label:last-of-type {
    margin-bottom: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq #tw-step-1:checked ~ .tw-panel--1,
  .page-faq #tw-step-2:checked ~ .tw-panel--2,
  .page-faq #tw-step-3:checked ~ .tw-panel--3 {
    animation: none;
  }
  .page-faq__branch {
    transition: none;
  }
  .page-faq__item,
  .page-faq__item summary::after {
    transition: none;
  }
}