.page-faq {
  --faq-blue: #0A3D62;
  --faq-orange: #FF6B35;
  --faq-lime: #C6FF00;
  --faq-paper: #F5EFE6;
  --faq-snow: #F7F9FC;
  --faq-ink: #2B2A25;
  --faq-sky: #00A0E9;
  --faq-red: #C1272D;
  --faq-yellow: #F2C500;
  --faq-edge: rgba(43, 42, 37, 0.16);
  --faq-shadow: 8px 8px 0 rgba(10, 61, 98, 0.12);

  background: var(--faq-snow);
  color: var(--faq-ink);
  font-family: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.75;
  overflow-x: clip;
  padding-bottom: var(--space-8);
}

/* ===== 首屏：斜线切割 + 问号叙事锚点 ===== */
.faq-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  padding: var(--space-7) var(--space-5) var(--space-6);
  background:
    linear-gradient(135deg, transparent 0%, transparent 55%, rgba(10, 61, 98, 0.04) 55.5%, rgba(10, 61, 98, 0.04) 100%),
    var(--faq-snow);
  gap: var(--space-6);
}

.faq-hero-inner {
  position: relative;
  z-index: 2;
  max-width: 640px;
}

.faq-hero .section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--faq-blue);
  color: var(--faq-snow);
  padding: 0.3rem 1rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.faq-title {
  font-size: clamp(1.8rem, 5.6vw, 3.4rem);
  font-weight: 900;
  font-family: "Noto Sans CJK Black", sans-serif;
  line-height: 1.2;
  color: var(--faq-blue);
  margin: var(--space-5) 0 var(--space-4);
  border-left: 6px solid var(--faq-orange);
  padding-left: var(--space-4);
}

.faq-hero-lede {
  font-size: 1.05rem;
  color: #4a5568;
  max-width: 42ch;
  margin-bottom: var(--space-5);
}

.hero-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.hero-mark {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
}

.hero-mark svg {
  width: min(200px, 60vw);
  height: auto;
  overflow: visible;
}

.hero-mark .hero-q {
  font-size: 120px;
  font-weight: 900;
  font-family: "Noto Sans CJK Black", sans-serif;
  fill: var(--faq-blue);
}

.faq-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 38%;
  height: 100%;
  background: linear-gradient(180deg, rgba(10, 61, 98, 0.03), transparent 70%);
  pointer-events: none;
}

/* ===== 问题分类索引 ===== */
.faq-index {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5) var(--space-6);
}

.faq-index-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--faq-paper);
  border: 1px solid var(--faq-edge);
  border-left: 4px solid var(--faq-blue);
  color: var(--faq-ink);
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.faq-index-item:hover {
  box-shadow: var(--faq-shadow);
  transform: translate(-2px, -2px);
}

.faq-index-num {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--faq-orange);
  font-family: "Source Han Serif SC", serif;
}

.faq-index-text {
  font-weight: 700;
  color: var(--faq-blue);
}

/* ===== 展区板块通用 ===== */
.faq-section {
  padding: var(--space-7) var(--space-5);
}

.bg-paper {
  background: var(--faq-paper);
}

.bg-snow {
  background: var(--faq-snow);
}

.container-narrow,
.container-full {
  width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}

.container-narrow {
  max-width: 920px;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}

.container-full {
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

.container-full .container-narrow {
  max-width: 920px;
  margin: 0 auto;
}

.section-head--split {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.section-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faq-orange);
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 900;
  color: var(--faq-blue);
  line-height: 1.25;
  margin: var(--space-2) 0 0;
}

.section-lede {
  font-size: 0.98rem;
  color: #5a6b7a;
  max-width: 46ch;
  margin: 0;
}

.qa-section .section-head .section-label.exhibition-tag {
  display: inline-block;
  background: var(--faq-blue);
  color: var(--faq-snow);
  padding: 0.25rem 0.9rem;
  font-size: 0.75rem;
}

/* ===== 折纸问答面板 ===== */
.qa-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.qa-item {
  background: var(--faq-snow);
  border: 1px solid var(--faq-edge);
  border-radius: 2px;
  box-shadow: 0 1px 0 rgba(10, 61, 98, 0.04);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  position: relative;
  overflow: hidden;
}

.qa-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--faq-blue), rgba(10, 61, 98, 0.2));
  opacity: 0.6;
}

.qa-item[open] {
  box-shadow: var(--faq-shadow);
  border-color: rgba(10, 61, 98, 0.4);
}

.qa-item > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-4);
  cursor: pointer;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--faq-blue);
  position: relative;
}

.qa-item > summary::-webkit-details-marker {
  display: none;
}

.qa-item > summary::after {
  content: "+";
  position: absolute;
  right: var(--space-4);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--faq-orange);
  transition: transform 0.2s ease;
}

.qa-item[open] > summary::after {
  content: "–";
}

.qa-item > summary:hover,
.qa-item > summary:focus-visible {
  background: rgba(10, 61, 98, 0.04);
}

.qa-item > summary:focus-visible {
  outline: 2px solid var(--faq-orange);
  outline-offset: -2px;
}

.qa-icon {
  flex: 0 0 2.2rem;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--faq-blue);
  color: var(--faq-snow);
  font-weight: 900;
  font-size: 1.1rem;
  border-radius: 50%;
}

.qa-item[open] .qa-icon {
  background: var(--faq-orange);
}

.qa-question {
  flex: 1;
  padding-right: var(--space-6);
}

.qa-answer {
  padding: 0 var(--space-5) var(--space-5) calc(var(--space-4) + 2.2rem + var(--space-4));
  color: #3d4852;
  font-size: 0.95rem;
  border-top: 1px dashed var(--faq-edge);
  margin-top: 0;
}

.qa-answer p {
  margin: var(--space-4) 0 0;
}

.qa-answer p:first-child {
  margin-top: var(--space-4);
}

.qa-steps {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.qa-steps li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: 0.9rem;
}

.step-mark {
  flex: 0 0 1.6rem;
  width: 1.6rem;
  height: 1.6rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--faq-paper);
  border: 1px solid var(--faq-edge);
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--faq-blue);
}

/* ===== 使用指南：频道网格 ===== */
.qa-channel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.channel-card {
  padding: var(--space-5);
  background: var(--faq-paper);
  border-left: 4px solid var(--faq-orange);
  box-shadow: 4px 4px 0 rgba(10, 61, 98, 0.08);
}

.channel-card .data-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faq-orange);
  margin-bottom: var(--space-2);
}

.channel-card .data-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--faq-blue);
  margin: 0 0 var(--space-2);
}

.channel-card .footnote {
  font-size: 0.82rem;
  color: #66788a;
  margin: 0;
}

/* ===== 数据更新：频率条 ===== */
.update-frequency {
  margin-top: var(--space-5);
  padding: var(--space-5);
  background: var(--faq-paper);
  border: 1px solid var(--faq-edge);
}

.frequency-item {
  display: grid;
  grid-template-columns: 5.5rem 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px dashed var(--faq-edge);
}

.frequency-item:last-child {
  border-bottom: none;
}

.frequency-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--faq-blue);
}

.frequency-bar {
  display: block;
  height: 6px;
  background: rgba(10, 61, 98, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.frequency-bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--faq-blue), var(--faq-orange));
  border-radius: 3px;
}

.frequency-value {
  font-size: 0.78rem;
  color: #66788a;
  white-space: nowrap;
}

.faq-section .footnote {
  font-size: 0.8rem;
  color: #8595a6;
  margin-top: var(--space-3);
}

/* ===== 同步：双栏布局 ===== */
.sync-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.sync-qa {
  gap: var(--space-4);
}

.sync-note {
  background: var(--faq-paper);
  padding: var(--space-6);
  border: 1px solid var(--faq-edge);
  border-top: 6px solid var(--faq-green, #009B77);
  box-shadow: 8px 8px 0 rgba(10, 61, 98, 0.10);
  align-self: start;
}

.sync-note-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--faq-blue);
  margin: 0 0 var(--space-3);
  font-family: "Noto Sans CJK Black", sans-serif;
}

.sync-note p:last-child {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.sync-note a,
.more-help-card a,
.qa-answer a {
  color: var(--faq-orange);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

.sync-note a:hover,
.more-help-card a:hover,
.qa-answer a:hover {
  color: var(--faq-blue);
}

/* ===== 版本对比表 ===== */
.version-compare {
  margin-top: var(--space-6);
  overflow-x: auto;
  border: 1px solid var(--faq-edge);
  background: var(--faq-snow);
}

.version-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  min-width: 560px;
}

.version-table th,
.version-table td {
  text-align: left;
  padding: var(--space-4);
  border-bottom: 1px solid var(--faq-edge);
}

.version-table th {
  background: var(--faq-blue);
  color: var(--faq-snow);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.version-table th:first-child {
  border-left: 4px solid var(--faq-orange);
}

.version-table td {
  color: #3d4852;
}

.version-table td:first-child {
  font-weight: 700;
  color: var(--faq-blue);
}

.version-table .highlight-cell {
  font-weight: 700;
  color: var(--faq-blue);
  background: rgba(198, 255, 0, 0.18);
  border-left: 3px solid var(--faq-orange);
}

.version-table tbody tr:last-child td {
  border-bottom: none;
}

/* ===== 更多帮助区域 ===== */
.faq-more {
  padding: var(--space-7) var(--space-5) 0;
}

.more-help-card {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  background: var(--faq-blue);
  color: var(--faq-snow);
  padding: var(--space-6);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.more-help-icon {
  flex: 0 0 2.8rem;
  width: 2.8rem;
  height: 2.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--faq-orange);
  color: var(--faq-snow);
  font-weight: 900;
  font-size: 1.4rem;
  border-radius: 50%;
}

.more-help-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 0 var(--space-2);
  font-family: "Noto Sans CJK Black", sans-serif;
}

.more-help-card p {
  margin: 0;
  font-size: 0.92rem;
  color: rgba(247, 249, 252, 0.92);
}

.more-help-card a {
  color: var(--faq-lime);
  text-decoration: underline;
}

/* ===== 图片容器 ===== */
.media-frame {
  display: block;
  overflow: hidden;
  position: relative;
  background: linear-gradient(145deg, #eef2f6, #e2e8ef);
}

.media-frame--wide {
  width: 100%;
  margin-top: var(--space-5);
}

.media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.qa-media::after {
  content: "图：功能界面示意";
  display: block;
  position: static;
  font-size: 0.72rem;
  color: #8595a6;
  padding: var(--space-2) 0 0;
  letter-spacing: 0.08em;
}

/* ===== 标签系统 ===== */
.hero-keywords .tag {
  background: transparent;
  border: 1px solid var(--faq-edge);
  padding: 0.25rem 0.8rem;
  font-size: 0.75rem;
  color: var(--faq-blue);
  font-weight: 700;
}

.hero-keywords .tag--orange {
  border-color: var(--faq-orange);
  background: var(--faq-orange);
  color: var(--faq-snow);
}

.qa-answer .tag--live {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: #0d2b3f;
  color: var(--faq-lime);
  font-size: 0.72rem;
  padding: 0.1rem 0.6rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.live-dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--faq-lime);
  animation: faq-pulse 1.6s ease-in-out infinite;
}

/* ===== 窄屏优先微调 ===== */
@media (max-width: 560px) {
  .faq-section {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .container-narrow {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .faq-index {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .faq-answer {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .qa-item > summary {
    padding: var(--space-4);
  }

  .qa-answer {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .frequency-item {
    grid-template-columns: 1fr auto;
    row-gap: var(--space-1);
  }

  .frequency-bar {
    grid-column: 1 / -1;
    order: 3;
  }
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .faq-hero {
    grid-template-columns: 1.15fr 0.85fr;
    padding: var(--space-8) var(--space-7) var(--space-7);
    align-items: center;
    gap: var(--space-7);
  }

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

  .faq-section {
    padding: var(--space-8) var(--space-7);
  }

  .section-head--split {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .section-lede {
    margin-bottom: 0.4rem;
  }

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

  .sync-layout {
    grid-template-columns: 1.4fr 0.6fr;
  }

  .qa-answer {
    padding-left: calc(var(--space-4) + 2.2rem + var(--space-4));
  }

  .more-help-card {
    padding: var(--space-7);
  }
}

@media (min-width: 1280px) {
  .faq-hero .section-label {
    font-size: 0.85rem;
  }

  .faq-title {
    font-size: 3.6rem;
  }

  .faq-hero-lede {
    font-size: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .faq-item,
  .faq-index-item,
  .qa-item,
  .live-dot {
    transition: none;
    animation: none;
  }

  .qa-item[open] {
    box-shadow: var(--faq-shadow);
  }
}

@keyframes faq-pulse {
  0%, 100% {
    opacity: 1;
  }

  50% {
    opacity: 0.25;
  }
}

.page-faq {
  --faq-green: var(--faq-ink);
}