.page-faq {
  --faq-cut: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  background: var(--clr-light-blue);
  color: var(--clr-ink);
}

/* ========== 首屏帮助中心横幅 ========== */
.faq-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 0;
  background:
    radial-gradient(circle at 88% 12%, rgba(255, 197, 61, 0.18) 0, transparent 30%),
    linear-gradient(135deg, var(--clr-blue) 0%, var(--clr-deep-blue) 100%);
  color: var(--clr-white);
}

.faq-hero::before {
  content: "";
  position: absolute;
  right: -60px;
  top: 30px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  transform: rotate(18deg);
  pointer-events: none;
}

.faq-hero__inner {
  position: relative;
  z-index: 1;
}

.faq-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
  margin: 0 0 16px;
  color: rgba(255, 255, 255, 0.65);
}

.faq-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
}

.faq-hero .breadcrumb a:hover {
  color: var(--clr-yellow);
}

.faq-hero .breadcrumb__sep {
  color: rgba(255, 255, 255, 0.4);
}

.faq-hero .breadcrumb__current {
  color: rgba(255, 255, 255, 0.68);
}

.faq-hero__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-yellow);
}

.faq-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.faq-hero__title-break {
  display: block;
}

.faq-hero__lead {
  max-width: 36em;
  margin: 0 0 20px;
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.86);
}

.faq-hero__copy .btn {
  display: inline-flex;
  align-items: center;
}

.faq-hero__media {
  margin-top: 24px;
}

.faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

/* ========== 快速开始：新手指南12节 ========== */
.faq-start {
  background: var(--clr-white);
  padding: 64px 0 72px;
  position: relative;
}

.faq-start::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--clr-blue) 0%, var(--clr-orange) 100%);
  opacity: 0.8;
}

.faq-start__heading {
  max-width: 720px;
  margin-bottom: 32px;
}

.faq-start .section-sub {
  margin: 0 0 6px;
  color: var(--clr-orange);
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.faq-start__heading h2 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.2;
  color: var(--clr-ink);
}

.faq-start__lead {
  margin: 0;
  color: var(--clr-slate);
  line-height: 1.7;
}

.faq-start__track {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.faq-start__item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--clr-light-blue);
  padding: 14px 14px 14px 16px;
  border-left: 4px solid var(--clr-orange);
  clip-path: var(--faq-cut);
  min-height: 56px;
}

.faq-start__item:nth-child(3n + 1) {
  border-left-color: var(--clr-orange);
}

.faq-start__item:nth-child(3n + 2) {
  border-left-color: var(--clr-green);
}

.faq-start__item:nth-child(3n) {
  border-left-color: var(--clr-yellow);
}

.faq-start__num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1rem;
  color: var(--clr-blue);
  flex: 0 0 auto;
}

.faq-start__label {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--clr-ink);
  line-height: 1.4;
}

.faq-fastlane {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
  padding: 18px 20px;
  background: var(--clr-cloud);
  border-left: 4px solid var(--clr-blue);
  clip-path: var(--faq-cut);
}

.faq-fastlane p {
  margin: 0;
  flex: 1 1 300px;
  color: var(--clr-slate);
}

.faq-fastlane a {
  color: var(--clr-blue);
  font-weight: 600;
  text-decoration-color: var(--clr-orange);
  text-underline-offset: 4px;
}

/* ========== 问答赛道 ========== */
.faq-race {
  background: linear-gradient(180deg, var(--clr-light-blue) 0%, var(--clr-white) 100%);
  padding: 64px 0 80px;
}

.faq-race__layout {
  display: grid;
  gap: 32px;
  align-items: start;
}

.faq-race__index {
  position: relative;
  z-index: 2;
}

.faq-race__index-card {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  background: var(--clr-deep-blue);
  padding: 14px 16px;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.faq-race__index-title {
  flex: 0 0 100%;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--clr-yellow);
  text-transform: uppercase;
  margin-bottom: 2px;
}

.faq-race__index-card a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.faq-race__index-card a:hover {
  background: var(--clr-orange);
  border-color: var(--clr-orange);
  color: #ffffff;
  transform: translateY(-2px);
}

.faq-race__content {
  min-width: 0;
}

.faq-race__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 28px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(10, 91, 158, 0.12);
  clip-path: var(--faq-cut);
}

.faq-race__filter-title {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--clr-slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-right: 4px;
}

.faq-race__chip {
  position: relative;
}

.faq-race__chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.faq-race__chip span {
  display: inline-block;
  padding: 8px 14px;
  background: var(--clr-white);
  border: 1px solid rgba(10, 91, 158, 0.2);
  color: var(--clr-slate);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.faq-race__chip span:hover {
  border-color: var(--clr-orange);
  color: var(--clr-orange);
}

.faq-race__chip input:checked + span {
  background: var(--clr-orange);
  border-color: var(--clr-orange);
  color: #ffffff;
}

/* 原生 CSS 分类过滤：选中某一类时隐藏其他分区 */
.faq-race__filters input[value="schedule"]:checked ~ .faq-taxons:not([data-category="schedule"]),
.faq-race__filters input[value="standings"]:checked ~ .faq-taxons:not([data-category="standings"]),
.faq-race__filters input[value="download"]:checked ~ .faq-taxons:not([data-category="download"]),
.faq-race__filters input[value="materials"]:checked ~ .faq-taxons:not([data-category="materials"]),
.faq-race__filters input[value="contact"]:checked ~ .faq-taxons:not([data-category="contact"]) {
  display: none;
}

/* ========== FAQ 分区 ========== */
.faq-taxons {
  display: block;
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--top-meta-height) + 24px);
}

.faq-taxons__heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px solid rgba(10, 91, 158, 0.16);
  padding-bottom: 10px;
  margin-bottom: 8px;
}

.faq-taxons__heading h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  color: var(--clr-ink);
}

.faq-taxons__rung {
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--clr-orange);
  font-size: 0.9375rem;
}

.faq-taxons__lead {
  color: var(--clr-slate);
  margin: 0 0 16px;
  font-size: 0.9375rem;
}

.faq-taxons__cards {
  display: block;
}

.faq-taxons__media {
  margin: 0 0 16px;
}

.faq-taxons__media img {
  width: 100%;
  height: auto;
  display: block;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.faq-taxons--standings .faq-taxons__heading,
.faq-taxons--standings .faq-taxons__lead {
  grid-column: 1 / -1;
}

/* ========== 问题卡片：起跑线装饰 ========== */
.faq-card {
  background: var(--clr-white);
  border-left: 4px solid var(--clr-orange);
  margin-bottom: 14px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.faq-card:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-2px);
}

.faq-card::before {
  content: "";
  display: block;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--clr-orange) 0 14px, var(--clr-light-blue) 14px 22px);
}

.faq-card[data-category="standings"] {
  border-left-color: var(--clr-green);
}

.faq-card[data-category="standings"]::before {
  background: repeating-linear-gradient(90deg, var(--clr-green) 0 14px, var(--clr-light-blue) 14px 22px);
}

.faq-card[data-category="download"] {
  border-left-color: var(--clr-yellow);
}

.faq-card[data-category="download"]::before {
  background: repeating-linear-gradient(90deg, var(--clr-yellow) 0 14px, var(--clr-light-blue) 14px 22px);
}

.faq-card[data-category="materials"] {
  border-left-color: var(--clr-blue);
}

.faq-card[data-category="materials"]::before {
  background: repeating-linear-gradient(90deg, var(--clr-blue) 0 14px, var(--clr-light-blue) 14px 22px);
}

.faq-card__details {
  display: block;
}

.faq-card__summary {
  list-style: none;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  cursor: pointer;
  padding: 18px 16px 18px 20px;
  font-weight: 700;
  color: var(--clr-ink);
  font-size: 1rem;
  line-height: 1.5;
}

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

.faq-card__text {
  flex: 1 1 60%;
}

.faq-card__summary .tag-badge {
  flex: 0 0 auto;
}

.faq-card__summary::after {
  content: "+";
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--clr-orange);
  margin-left: auto;
  line-height: 1;
}

.faq-card__details[open] .faq-card__summary::after {
  content: "−";
}

.faq-card__answer {
  padding: 14px 20px 20px 24px;
  color: var(--clr-slate);
  font-size: 0.9375rem;
  line-height: 1.7;
  border-top: 1px dashed rgba(10, 91, 158, 0.18);
}

.faq-card__answer p {
  margin: 0;
}

.faq-card__answer a {
  color: var(--clr-blue);
  font-weight: 600;
  text-decoration-color: var(--clr-orange);
  text-underline-offset: 4px;
}

.faq-card__details[open] .faq-card__answer {
  animation: faqAnswerIn 0.22s var(--ease-out);
}

@keyframes faqAnswerIn {
  from {
    opacity: 0;
    transform: translate(8px, 6px);
  }
  to {
    opacity: 1;
    transform: translate(0, 0);
  }
}

/* ========== 联系官方客服 ========== */
.faq-contact {
  position: relative;
  overflow: hidden;
  background: var(--clr-deep-blue);
  color: rgba(255, 255, 255, 0.8);
  padding: 28px 24px;
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 0 100%);
}

.faq-contact::before {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  border: 2px solid rgba(255, 255, 255, 0.12);
  transform: rotate(18deg);
  pointer-events: none;
}

.faq-contact__intro {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0 0 20px;
  max-width: 50em;
}

.faq-contact__table {
  display: grid;
  gap: 14px;
  margin: 0 0 20px;
}

.faq-contact__row {
  display: grid;
  gap: 4px;
}

.faq-contact__row dt {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--clr-yellow);
  text-transform: uppercase;
}

.faq-contact__row dd {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
}

.faq-contact__row a {
  color: #ffffff;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.faq-contact__row a:hover {
  border-color: var(--clr-orange);
  color: var(--clr-yellow);
}

.faq-contact__note {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  padding-top: 14px;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
  margin: 0;
}

/* ========== 响应式 ========== */
@media (min-width: 768px) {
  .faq-start {
    padding: 72px 0 80px;
  }

  .faq-start__track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .faq-taxons--standings {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    column-gap: 24px;
  }

  .faq-taxons--standings .faq-taxons__media {
    grid-column: 2;
    grid-row: 3;
  }

  .faq-taxons--standings .faq-taxons__cards {
    grid-column: 1;
    grid-row: 3;
  }

  .faq-contact {
    padding: 32px 32px 28px;
  }

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

@media (min-width: 1024px) {
  .faq-hero {
    padding: 44px 0 0;
  }

  .faq-hero__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
    align-items: center;
  }

  .faq-hero__media {
    margin-top: 0;
  }

  .faq-hero__media img {
    width: 100%;
    height: 460px;
    object-fit: cover;
    object-position: center 15%;
  }

  .faq-race__layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 40px;
  }

  .faq-race__index {
    position: sticky;
    top: calc(var(--top-meta-height) + 24px);
  }

  .faq-race__index-card {
    display: block;
    padding: 20px;
  }

  .faq-race__index-card a {
    display: block;
    margin: 0 0 6px;
    padding: 8px 12px;
    border: 0;
    border-left: 3px solid rgba(255, 255, 255, 0.25);
  }

  .faq-race__index-card a:hover {
    border-left-color: var(--clr-orange);
  }

  .faq-start__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .faq-taxons {
    margin-bottom: 56px;
  }
}