:root {
  --bg: #eef0f2;
  --card: #ffffff;
  --ink: #131313;
  --muted: #666;
  --line: #e7e7e7;
  --teal: #86d7d2;
  --teal-deep: #39a8a0;
  --shadow: 0 6px 18px rgba(20, 20, 20, 0.08);
  --font-xuexi-title: "FZYaSong-H-GBK", "FZYaSongS-R-GB", "PingFang SC", miui, system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, sans-serif;
  --font-xuexi-body: "FZYaSongS-R-GB", "FZYaSong-M-GBK", "PingFang SC", miui, system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, sans-serif;
  --font-xuexi-meta: "PingFang SC", miui, system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-xuexi-body);
}

button,
input {
  font: inherit;
}

.page-shell {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: env(safe-area-inset-top, 0) 12px calc(20px + env(safe-area-inset-bottom, 0));
  overflow-x: hidden;
}

.hero {
  position: relative;
  height: 158px;
  margin: 0 -12px;
  overflow: hidden;
  border-radius: 0 0 18px 18px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(15, 21, 25, 0.06), rgba(15, 21, 25, 0.16));
  pointer-events: none;
}

.hero__mist {
  position: absolute;
  inset: auto 0 0;
  height: 52px;
  background: linear-gradient(180deg, transparent, rgba(238, 240, 242, 0.95));
  pointer-events: none;
}

.hero-carousel {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-carousel__track {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.65s ease;
}

.hero-slide {
  flex: 0 0 100%;
  height: 100%;
}

.hero-slide__photo {
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(180deg, rgba(7, 18, 27, 0.1), rgba(7, 18, 27, 0.32)),
    var(--card-image);
  background-size: cover;
  background-position: var(--card-position, center);
}

.hero-carousel__dots {
  position: absolute;
  right: 16px;
  bottom: 44px;
  display: flex;
  gap: 8px;
  z-index: 2;
}

.hero-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.46);
}

.hero-dot.is-active {
  width: 22px;
  background: rgba(255, 255, 255, 0.95);
}

.brand-card {
  position: absolute;
  left: 16px;
  bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 86px;
  min-height: 112px;
  padding: 8px 10px;
  border-radius: 22px;
  background: transparent;
  border: 0;
  box-shadow: none;
  z-index: 3;
}

.brand-card::before {
  content: none;
}

.brand-card__crest {
  position: absolute;
  top: 10px;
  left: 50%;
  width: 30px;
  height: 3px;
  border-radius: 999px;
  transform: translateX(-50%);
  background:
    linear-gradient(90deg, rgba(194, 164, 110, 0.15), rgba(194, 164, 110, 0.95), rgba(194, 164, 110, 0.15));
}

.brand-card__logo {
  position: relative;
  z-index: 1;
  display: block;
  width: 38px;
  height: auto;
  max-height: 92px;
  object-fit: contain;
  filter:
    drop-shadow(0 2px 0 rgba(255, 255, 255, 0.6))
    drop-shadow(0 6px 12px rgba(15, 50, 92, 0.08));
}

.section-card {
  width: 100%;
  margin-top: 12px;
  padding: 14px 14px 16px;
  background: var(--card);
  border: 1px solid #e5e5e5;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(20, 20, 20, 0.05);
  overflow: hidden;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-xuexi-title);
  font-size: 18px;
  font-weight: 500;
}

.preface-text {
  color: #3f3f3f;
  font-family: var(--font-xuexi-body);
  font-size: 16px;
  line-height: 1.9;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.section-card--preface {
  cursor: pointer;
}

.road-sections {
  display: grid;
  gap: 14px;
}

.road-section {
  margin-top: 0;
  height: 252px;
  min-height: 252px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.road-section--scroll {
  height: auto;
  min-height: 0;
  padding-bottom: 12px;
}

.road-grid {
  display: grid;
  gap: 7px;
  width: 100%;
  flex: 1;
  align-content: start;
  min-height: 92px;
}

.road-section--scroll .road-grid {
  flex: 0 0 auto;
  min-height: 0;
}

.road-grid--scroll {
  display: flex;
  overflow-x: auto;
  width: calc(100% + 14px);
  padding-right: 14px;
  padding-bottom: 2px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.road-grid--scroll::-webkit-scrollbar {
  display: none;
}

.road-grid--scroll .road-card {
  flex: 0 0 78px;
  scroll-snap-align: start;
}

.road-grid--scroll .thumb--small {
  aspect-ratio: auto;
  min-height: 76px;
}

.road-grid--scroll .road-card p {
  margin-top: 6px;
}

.road-grid--grid-4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  align-content: stretch;
}

.road-grid--grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: 1fr;
  align-content: stretch;
}

.road-grid--feature-3 {
  grid-template-columns: 1.2fr 1fr;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  align-content: stretch;
}

.road-grid--feature-3 .road-card:first-child {
  grid-row: 1 / span 2;
  grid-column: 1;
}

.road-grid--feature-3 .road-card:nth-child(2) {
  grid-row: 1;
  grid-column: 2;
}

.road-grid--feature-3 .road-card:nth-child(3) {
  grid-row: 2;
  grid-column: 2;
}

.road-card {
  cursor: pointer;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.thumb {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.road-grid--grid-4 .thumb,
.road-grid--grid-3 .thumb,
.road-grid--feature-3 .thumb {
  flex: 1;
}

.thumb__photo {
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(180deg, rgba(11, 26, 38, 0.08), rgba(11, 26, 38, 0.22)),
    var(--card-image);
  background-size: cover;
  background-position: var(--card-position, center);
  transform: scale(1.02);
}

.thumb--small {
  aspect-ratio: 1.02 / 1;
}

.road-grid--grid-4 .thumb--small {
  aspect-ratio: auto;
  min-height: 72px;
}

.road-grid--grid-3 .thumb--small {
  aspect-ratio: auto;
  min-height: 112px;
}

.road-grid--feature-3 .thumb--small {
  aspect-ratio: auto;
  min-height: 72px;
}

.road-grid--feature-3 .road-card:first-child .thumb--small {
  min-height: 152px;
}

.road-card p,
.road-card span {
  display: block;
  text-align: center;
}

.road-card p {
  margin: 4px 0 0;
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.road-grid--grid-3 .road-card p {
  margin-top: 6px;
}

.road-grid--feature-3 .road-card p {
  margin-top: 5px;
}

.detail-dialog {
  width: min(100%, 430px);
  border: 0;
  padding: 0;
  background: transparent;
}

.detail-dialog::backdrop {
  background: rgba(12, 22, 25, 0.42);
  backdrop-filter: blur(6px);
}

.detail-dialog__panel {
  position: relative;
  margin: auto 12px 14px;
  padding: 24px 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 28px 80px rgba(19, 23, 21, 0.26);
}

.detail-dialog__back,
.detail-dialog__close {
  position: absolute;
  top: 12px;
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 999px;
  background: rgba(18, 33, 29, 0.08);
  font-size: 24px;
}

.detail-dialog__back {
  left: 12px;
}

.detail-dialog__close {
  right: 12px;
}

.detail-dialog__back.is-hidden {
  display: none;
}

.detail-dialog__eyebrow {
  margin: 0;
  color: #6c6c6c;
  font-size: 12px;
  letter-spacing: 0.1em;
}

.detail-dialog h2 {
  margin: 8px 0 0;
  font-family: var(--font-xuexi-title);
  font-size: 24px;
  font-weight: 500;
  line-height: 1.5;
  color: #333;
}

.detail-dialog__summary,
.detail-dialog__content {
  font-family: var(--font-xuexi-body);
  color: #333;
  line-height: 2;
}

.detail-dialog__content p {
  margin: 0;
}

.detail-dialog__content p + p {
  margin-top: 12px;
}

.catalog-view,
.article-view {
  --detail-accent: #2c74b7;
  --detail-soft: rgba(44, 116, 183, 0.12);
  margin-top: 12px;
}

.catalog-hero,
.article-hero {
  position: relative;
  padding: 15px 14px;
  border-radius: 16px;
  background:
    linear-gradient(135deg, var(--detail-soft), rgba(255, 255, 255, 0.94)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(249, 249, 247, 0.96));
  border: 1px solid rgba(21, 27, 33, 0.06);
  overflow: hidden;
}

.catalog-hero::before,
.article-hero::before {
  content: "";
  position: absolute;
  inset: auto -28px -28px auto;
  width: 120px;
  height: 120px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.48), transparent 66%);
  pointer-events: none;
}

.catalog-hero__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.catalog-hero__eyebrow,
.article-hero__eyebrow {
  margin: 0;
  color: var(--detail-accent);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.catalog-hero__count {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--detail-accent);
  font-size: 11px;
  font-weight: 700;
}

.catalog-hero__intro,
.article-hero__lead {
  margin: 10px 0 0;
  font-family: var(--font-xuexi-body);
  color: #2c3136;
  line-height: 1.9;
}

.catalog-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.catalog-item {
  width: 100%;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 18px;
  gap: 12px;
  align-items: start;
  padding: 14px 12px;
  border: 1px solid rgba(22, 30, 38, 0.06);
  border-radius: 16px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.98), var(--detail-soft));
  box-shadow: 0 10px 24px rgba(18, 30, 36, 0.06);
  text-align: left;
}

.catalog-item__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--detail-accent);
  font-family: var(--font-xuexi-title);
  font-size: 22px;
  font-weight: 700;
  box-shadow: inset 0 0 0 1px rgba(26, 32, 39, 0.04);
}

.catalog-item__body {
  min-width: 0;
}

.catalog-item__eyebrow,
.catalog-item__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 11px;
  color: #6b737b;
}

.catalog-item__title {
  display: block;
  margin-top: 5px;
  font-family: var(--font-xuexi-title);
  color: #14181d;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
}

.catalog-item__abstract {
  display: block;
  margin-top: 6px;
  color: #4b535b;
  font-size: 13px;
  line-height: 1.65;
}

.catalog-item__meta {
  margin-top: 8px;
}

.catalog-item__arrow {
  align-self: center;
  color: var(--detail-accent);
  font-size: 20px;
  line-height: 1;
}

.article-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.article-hero__meta span,
.catalog-item__meta span {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
}

.article-body {
  font-family: var(--font-xuexi-body);
  margin-top: 14px;
  padding: 0 2px;
}

.article-body p {
  margin: 0;
  color: #333;
  font-size: 18px;
  line-height: 2;
  text-align: justify;
}

.article-body p + p {
  margin-top: 14px;
}

.detail-groups {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.detail-groups--scroll {
  display: flex;
  overflow-x: auto;
  gap: 10px;
  padding-bottom: 4px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.detail-groups--scroll::-webkit-scrollbar {
  display: none;
}

.detail-groups--grid-4,
.detail-groups--grid-3 {
  display: grid;
  gap: 10px;
}

.detail-groups--grid-4 {
  grid-template-columns: repeat(2, 1fr);
}

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

.detail-group {
  min-height: 78px;
  padding: 12px 10px;
  border-radius: 10px;
  background-image:
    linear-gradient(180deg, rgba(10, 21, 33, 0.08), rgba(10, 21, 33, 0.28)),
    var(--card-image);
  background-size: cover;
  background-position: var(--card-position, center);
  border: 1px solid #ececec;
  color: #fff;
  font-size: 14px;
  line-height: 1.5;
  box-shadow: 0 2px 8px rgba(20, 20, 20, 0.04);
  display: flex;
  align-items: flex-end;
}

.detail-group span {
  display: block;
  font-weight: 700;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.detail-groups--scroll .detail-group {
  flex: 0 0 118px;
  scroll-snap-align: start;
}