.page-news {
  --color-primary: #1A237E;
  --color-accent: #00E676;
  --color-accent-secondary: #FFD700;
  --color-surface: #0D1B2A;
  --color-on-surface: #E0E0E0;
  --color-on-primary: #FFFFFF;
  --glass-bg: rgba(26,35,126,0.65);
  --glass-border: rgba(255,255,255,0.08);
  --font-headline: "Montserrat","Helvetica Neue",Arial,sans-serif;
  --font-body: "Inter","Segoe UI","Helvetica Neue",Arial,sans-serif;
  --font-special: "Playfair Display","Times New Roman",serif;
  --container-max: 1280px;
  --header-height: 56px;
  --transition-speed: 0.35s;
}

.page-news__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.page-news__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-on-surface);
  opacity: 0.7;
  margin-bottom: 1rem;
}

.page-news__breadcrumb-link {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity var(--transition-speed) ease;
}

.page-news__breadcrumb-link:hover,
.page-news__breadcrumb-link:focus {
  opacity: 0.7;
  text-decoration: underline;
}

.page-news__breadcrumb-sep {
  color: var(--color-on-surface);
  opacity: 0.4;
}

.page-news__breadcrumb-current {
  font-weight: 600;
}

.page-news__title {
  font-family: var(--font-headline);
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--color-on-primary);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}

.page-news__subtitle {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-on-surface);
  opacity: 0.8;
  max-width: 680px;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.page-news__section {
  margin-bottom: 3.5rem;
}

.page-news__section-title {
  font-family: var(--font-headline);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-on-primary);
  letter-spacing: -0.01em;
  margin: 0 0 1.5rem;
  border-left: 4px solid var(--color-accent);
  padding-left: 1rem;
}

.page-news__timeline {
  position: relative;
  padding-left: 2.5rem;
}

.page-news__timeline-line {
  position: absolute;
  left: 0.875rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-primary-variant));
  border-radius: 1px;
}

.page-news__timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  transition: transform 0.4s cubic-bezier(0.25,0.46,0.45,0.94), opacity 0.4s ease;
}

.page-news__timeline-item[data-reveal="left"] {
  transform: translateX(-20px);
  opacity: 0;
}

.page-news__timeline-item[data-reveal="right"] {
  transform: translateX(20px);
  opacity: 0;
}

.page-news__timeline-item[data-revealed] {
  transform: translateX(0);
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .page-news__timeline-item {
    transform: none !important;
    opacity: 1 !important;
    transition: none;
  }
}

.page-news__timeline-node {
  position: absolute;
  left: -2.5rem;
  top: 0.25rem;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
  transition: background var(--transition-speed) ease, transform var(--transition-speed) ease;
}

.page-news__timeline-node:hover,
.page-news__timeline-node:focus {
  background: var(--color-accent);
  transform: scale(1.2);
}

.page-news__version-badge {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  user-select: none;
}

.page-news__card {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: box-shadow var(--transition-speed) ease, background var(--transition-speed) ease;
}

.page-news__card:hover {
  box-shadow: 0 8px 24px rgba(0,230,118,0.15);
  background: rgba(26,35,126,0.75);
}

.page-news__card-title {
  font-family: var(--font-headline);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-on-primary);
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

.page-news__card-summary {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-on-surface);
  line-height: 1.5;
  margin: 0 0 0.75rem;
}

.page-news__card-detail {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-on-surface);
  opacity: 0.85;
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.page-news__card-detail[hidden] {
  display: none;
}

.page-news__card-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  background: transparent;
  border: 1px solid var(--color-accent);
  border-radius: 6px;
  padding: 0.3rem 0.8rem;
  cursor: pointer;
  transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.page-news__card-toggle:hover,
.page-news__card-toggle:focus {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.page-news__card-figure {
  margin: 1rem 0 0.5rem;
}

.page-news__card-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
}

.page-news__card-caption {
  font-family: var(--font-special);
  font-size: 0.8rem;
  color: var(--color-on-surface);
  opacity: 0.6;
  margin-top: 0.4rem;
  font-style: italic;
}

.page-news__placeholder-text {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-on-surface);
  opacity: 0.7;
  margin-bottom: 1rem;
}

.page-news__history-note {
  padding: 1.25rem;
  border-radius: 10px;
}

.page-news__history-note p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-on-surface);
  line-height: 1.5;
  margin: 0;
}

.page-news__section-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-on-surface);
  opacity: 0.8;
  margin-bottom: 1.75rem;
}

.page-news__future-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-news__future-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--glass-bg);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 1.25rem;
}

.page-news__future-badge {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-accent-secondary);
  line-height: 1;
  flex-shrink: 0;
  width: 2rem;
  text-align: center;
}

.page-news__future-item-title {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-on-primary);
  margin: 0 0 0.25rem;
}

.page-news__future-item-desc {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-on-surface);
  line-height: 1.5;
  margin: 0;
}

.page-news__trust-note {
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-left: 4px solid var(--color-accent);
  background: rgba(0,230,118,0.06);
  border-radius: 0 8px 8px 0;
}

.page-news__trust-text {
  font-family: var(--font-special);
  font-size: 0.95rem;
  color: var(--color-on-surface);
  line-height: 1.6;
  margin: 0;
  font-style: italic;
}

/* 移动端优先：单列布局，小屏优化 */
@media (max-width: 639px) {
  .page-news__title {
    font-size: 1.8rem;
  }

  .page-news__section-title {
    font-size: 1.35rem;
  }

  .page-news__timeline {
    padding-left: 1.8rem;
  }

  .page-news__timeline-line {
    left: 0.5rem;
  }

  .page-news__timeline-node {
    left: -1.8rem;
    width: 1.4rem;
    height: 1.4rem;
  }

  .page-news__card {
    padding: 1rem;
  }

  .page-news__card-title {
    font-size: 1rem;
  }

  .page-news__future-item {
    flex-direction: column;
  }

  .page-news__future-badge {
    width: auto;
    text-align: left;
  }
}

/* 平板及桌面布局 */
@media (min-width: 640px) {
  .page-news__container {
    padding: 2rem 2rem 4rem;
  }

  .page-news__title {
    font-size: 3rem;
  }

  .page-news__timeline {
    padding-left: 3rem;
  }

  .page-news__timeline-line {
    left: 1rem;
  }

  .page-news__timeline-node {
    left: -3rem;
    width: 2rem;
    height: 2rem;
  }

  .page-news__card {
    padding: 1.5rem;
  }

  .page-news__future-list {
    grid-template-columns: 1fr 1fr;
  }

  .page-news__future-item:nth-child(3) {
    grid-column: 1 / -1;
    max-width: 50%;
  }
}

@media (min-width: 1024px) {
  .page-news__container {
    padding: 2.5rem 3rem 5rem;
  }

  .page-news__title {
    font-size: 3.5rem;
  }

  .page-news__timeline {
    padding-left: 4rem;
  }

  .page-news__timeline-line {
    left: 1.25rem;
  }

  .page-news__timeline-node {
    left: -4rem;
    width: 2.25rem;
    height: 2.25rem;
  }

  .page-news__future-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .page-news__future-item:nth-child(3) {
    grid-column: auto;
    max-width: none;
  }
}