.page-news {
  --news-sticky-top: 104px;
  background: var(--deep);
  color: var(--mist);
}

.page-news .brief-banner {
  position: relative;
  overflow: hidden;
  background: var(--night);
  border-bottom: 1px solid var(--line);
}

.page-news .brief-banner__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(1.6rem, 5vw, 3.4rem);
  padding-bottom: clamp(1.8rem, 5vw, 3rem);
}

.page-news .brief-banner__wave {
  position: absolute;
  right: -4%;
  top: 46%;
  transform: translateY(-50%);
  width: min(62%, 720px);
  height: auto;
  opacity: 0.4;
  pointer-events: none;
  display: none;
}

.page-news .brief-banner .page-title {
  margin: 0.35rem 0 0.9rem;
  line-height: 0.98;
}

.page-news .brief-banner__lede {
  max-width: 56ch;
  margin: 0;
  color: var(--silver);
}

.page-news .brief-banner__strip {
  border-top: 1px solid var(--line);
  background: var(--deep);
}

.page-news .brief-banner__strip img {
  display: block;
  width: 100%;
  height: 160px;
  object-fit: cover;
  opacity: 0.85;
}

/* 左栏筛选 + 右栏条目流 */
.page-news .brief-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding-top: clamp(1.75rem, 4vw, 3rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-news .brief-filter {
  align-self: start;
  border: 1px solid var(--line);
  background: var(--glass);
  padding: 1.1rem 1rem;
}

.page-news .brief-filter__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-news .brief-filter__list {
  list-style: none;
  margin: 0 0 1.2rem;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-news .brief-filter__link {
  display: block;
  padding: 0.55rem 0.75rem;
  border-left: 2px solid transparent;
  color: var(--silver);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-news .brief-filter__link:hover,
.page-news .brief-filter__link:focus-visible {
  color: var(--mist);
  border-left-color: var(--cyan);
  background: var(--slate);
}

.page-news .brief-filter__link--current {
  color: var(--mist);
  border-left-color: var(--orange);
  background: var(--slate);
}

.page-news .brief-index {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.page-news .brief-index__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin: 0;
  padding: 0.42rem 0;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-news .brief-index__row:last-child {
  border-bottom: 0;
}

.page-news .brief-index__row strong {
  color: var(--cyan);
  font-weight: 500;
  white-space: nowrap;
}

/* 系列分组与条目 */
.page-news .brief-group {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-news .brief-group:last-child {
  margin-bottom: 0;
}

.page-news .brief-group__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 0.25rem 0.7rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
}

.page-news .brief-group__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-news .brief-group__title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-news .brief-group__hint {
  grid-column: 2;
  font-size: 0.85rem;
  color: var(--silver);
}

.page-news .brief-item {
  border-bottom: 1px solid var(--line);
}

.page-news .brief-item__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "time tag mark"
    "title title title";
  align-items: center;
  gap: 0.45rem 0.7rem;
  padding: 0.9rem 0.55rem;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease);
}

.page-news .brief-item__summary::-webkit-details-marker {
  display: none;
}

.page-news .brief-item__summary:hover,
.page-news .brief-item__summary:focus-visible {
  background: var(--slate);
}

.page-news .brief-item__summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -1px;
}

.page-news .brief-item[open] .brief-item__summary {
  background: var(--slate);
}

.page-news .brief-item__time {
  grid-area: time;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
  white-space: nowrap;
}

.page-news .brief-item__title {
  grid-area: title;
  font-size: 0.98rem;
  color: var(--mist);
  line-height: 1.55;
}

.page-news .brief-item__mark {
  grid-area: mark;
  position: relative;
  width: 18px;
  height: 18px;
  justify-self: end;
}

.page-news .brief-item__mark::before,
.page-news .brief-item__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan);
  transform: translate(-50%, -50%);
  transition: opacity var(--dur) var(--ease);
}

.page-news .brief-item__mark::before {
  width: 11px;
  height: 1px;
}

.page-news .brief-item__mark::after {
  width: 1px;
  height: 11px;
}

.page-news .brief-item[open] .brief-item__mark::after {
  opacity: 0;
}

.page-news .brief-item__body {
  padding: 0.1rem 0.55rem 1.25rem;
}

.page-news .brief-item__body p {
  margin: 0 0 0.7rem;
  max-width: 60ch;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-news .brief-item__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-news .brief-item__link:hover,
.page-news .brief-item__link:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--mist);
}

/* 系列标签 */
.page-news .brief-tag {
  grid-area: tag;
  display: inline-block;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  padding: 0.16rem 0.42rem;
  border: 1px solid currentColor;
  border-radius: 2px;
  white-space: nowrap;
}

.page-news .brief-tag--version {
  color: var(--orange);
}

.page-news .brief-tag--column {
  color: var(--cyan);
}

.page-news .brief-tag--device {
  color: var(--amber);
}

.page-news .brief-tag--ops {
  color: var(--silver);
}

/* 四个系列说明 */
.page-news .brief-series .section-title {
  margin: 0.4rem 0 0.8rem;
}

.page-news .brief-series__lead {
  max-width: 62ch;
  color: var(--silver);
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
}

.page-news .brief-series__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-news .brief-series__card {
  background: var(--slate);
  padding: 1.4rem 1.3rem 1.5rem;
  border-top: 3px solid var(--line);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-news .brief-series__card:hover {
  background: var(--night);
}

.page-news .brief-series__card--version {
  border-top-color: var(--orange);
}

.page-news .brief-series__card--column {
  border-top-color: var(--cyan);
}

.page-news .brief-series__card--device {
  border-top-color: var(--amber);
}

.page-news .brief-series__card--ops {
  border-top-color: var(--silver);
}

.page-news .brief-series__name {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  color: var(--mist);
  letter-spacing: 0.02em;
}

.page-news .brief-series__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--silver);
}

/* 通用图片处理 */
.page-news .brief-figure {
  margin: 0;
}

.page-news .brief-figure .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--slate);
}

.page-news .brief-figure .figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-news .brief-figure .figure__caption {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

/* 运营观察 */
.page-news .brief-observe__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-news .brief-observe__body .section-sub {
  margin: 0.4rem 0 0.9rem;
  line-height: 1.35;
}

.page-news .brief-observe__body .prose {
  color: var(--silver);
  margin: 0 0 0.9rem;
  max-width: 62ch;
}

.page-news .brief-observe__body .prose:last-child {
  margin-bottom: 0;
}

/* 版本号说明 */
.page-news .brief-release__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-news .brief-release__marker {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-news .brief-release__marker .mono-tag {
  color: var(--silver);
}

.page-news .brief-release__num {
  margin: 0;
  font-size: clamp(64px, 15vw, 96px);
  font-weight: 700;
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-news .brief-release__body .section-title {
  margin: 0 0 0.9rem;
}

.page-news .brief-release__body .prose {
  color: var(--silver);
  margin: 0 0 1.3rem;
  max-width: 60ch;
}

.page-news .brief-release__points {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 1.6rem;
}

.page-news .brief-release__point {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
  background: var(--slate);
  padding: 0.85rem 1rem;
}

.page-news .brief-release__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-news .brief-release__val {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--mist);
}

/* 时间脉络 */
.page-news .brief-timeline .section-title {
  margin: 0.4rem 0 clamp(1.5rem, 4vw, 2.25rem);
  max-width: 26ch;
}

.page-news .brief-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-news .brief-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}

.page-news .brief-track__item {
  position: relative;
  padding-top: 1.6rem;
}

.page-news .brief-track__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 100%;
  height: 1px;
  background: var(--line);
}

.page-news .brief-track__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-news .brief-track__item:last-child::after {
  background: var(--orange);
  animation: news-pulse 3s ease-in-out infinite;
}

.page-news .brief-track__when {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 0.35rem;
}

.page-news .brief-track__name {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--mist);
  letter-spacing: 0.01em;
}

.page-news .brief-track__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--silver);
}

@keyframes news-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(255, 107, 44, 0.45);
  }
  50% {
    box-shadow: 0 0 0 7px rgba(255, 107, 44, 0);
  }
}

/* 跟进方式 */
.page-news .brief-follow .section-title {
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
}

.page-news .brief-follow__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-news .brief-follow__card {
  background: var(--night);
  padding: 1.4rem 1.3rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  transition: background var(--dur) var(--ease);
}

.page-news .brief-follow__card:hover {
  background: var(--slate);
}

.page-news .brief-follow__card .mono-tag {
  color: var(--cyan);
}

.page-news .brief-follow__name {
  margin: 0;
  font-size: 1.05rem;
  color: var(--mist);
}

.page-news .brief-follow__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--silver);
  flex-grow: 1;
}

.page-news .brief-follow__link {
  align-self: flex-start;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-news .brief-follow__link:hover,
.page-news .brief-follow__link:focus-visible {
  color: var(--warm);
  border-bottom-color: var(--orange);
}

/* 断点：平板 */
@media (min-width: 620px) {
  .page-news .brief-banner__strip img {
    height: 210px;
  }

  .page-news .brief-series__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-news .brief-follow__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-news .brief-release__point {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
    gap: 0.9rem;
  }

  .page-news .brief-item__summary {
    grid-template-columns: 108px 92px minmax(0, 1fr) 22px;
    grid-template-areas: "time tag title mark";
    padding: 1rem 0.75rem;
  }

  .page-news .brief-item__body {
    padding-left: 1.9rem;
  }
}

/* 断点：桌面 */
@media (min-width: 920px) {
  .page-news .brief-banner__wave {
    display: block;
  }

  .page-news .brief-banner__strip img {
    height: 240px;
  }

  .page-news .brief-layout {
    grid-template-columns: 234px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-news .brief-filter {
    position: sticky;
    top: var(--news-sticky-top);
  }

  .page-news .brief-series__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-news .brief-follow__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-news .brief-observe__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-news .brief-release__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3rem);
  }

  .page-news .brief-timeline__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(2rem, 4vw, 3.25rem);
  }

  .page-news .brief-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-news .brief-track__item:last-child::after {
    animation: none;
  }

  .page-news .brief-item__summary,
  .page-news .brief-filter__link,
  .page-news .brief-series__card,
  .page-news .brief-follow__card,
  .page-news .brief-follow__link,
  .page-news .brief-item__link {
    transition: none;
  }
}