/* ═══════════════════════════════════════
   COMPONENTS · 组件样式
   ═══════════════════════════════════════ */

/* ── Category Chips (mobile) ── */
.category-chips {
  display: none;
  padding: var(--space-md) var(--space-2xl);
  gap: var(--space-sm);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.category-chips::-webkit-scrollbar { display: none; }

.chip {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--duration-fast) var(--ease-in-out);
}

.chip:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.chip.active {
  background: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}

/* ── News Card ── */
.news-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-light);
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s var(--ease-out-expo),
    transform 0.6s var(--ease-out-expo),
    box-shadow 0.35s var(--ease-out-expo),
    border-color 0.3s var(--ease-in-out);
}

.news-card.revealed {
  opacity: 1;
  transform: translateY(0);
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px var(--color-shadow-hover);
  border-color: var(--color-accent);
}

/* Card accent bar (replaces image) */
.news-card-accent {
  height: 4px;
  border-radius: 0;
  transition: height 0.3s var(--ease-in-out);
}

.news-card:hover .news-card-accent {
  height: 6px;
}

/* Card header: source tag + category */
.news-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.news-card-source-tag {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border: 1px solid currentColor;
  border-radius: 2px;
}

.news-card-body {
  padding: var(--space-lg);
}

.news-card-category {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-block;
}

.news-card-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-snug);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card-title a:hover {
  color: var(--color-accent);
  transition: color var(--duration-fast);
}

.news-card-summary {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-light);
}

/* ── Theme Toggle ── */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-fast);
  color: var(--color-text-secondary);
  font-size: 1.2rem;
}

.theme-toggle:hover {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
}

/* ── Search Button ── */
.search-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-fast);
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}

.search-toggle:hover {
  background: var(--color-bg-secondary);
  color: var(--color-accent);
}

/* ── Search Overlay ── */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 15vh;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal);
}

.search-overlay.open {
  opacity: 1;
  visibility: visible;
}

.search-form {
  width: 100%;
  max-width: 600px;
  padding: 0 var(--space-2xl);
}

.search-input {
  width: 100%;
  padding: var(--space-lg) 0;
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 300;
  border: none;
  border-bottom: 2px solid var(--color-border);
  background: transparent;
  color: var(--color-text-primary);
  outline: none;
  letter-spacing: var(--tracking-wide);
}

.search-input::placeholder {
  color: var(--color-text-tertiary);
}

.search-input:focus {
  border-bottom-color: var(--color-accent);
}

.search-results {
  width: 100%;
  max-width: 600px;
  margin-top: var(--space-2xl);
  padding: 0 var(--space-2xl);
  max-height: 60vh;
  overflow-y: auto;
}

.search-result-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border-light);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.search-result-item:hover {
  color: var(--color-accent);
}

.search-close {
  position: absolute;
  top: var(--space-2xl);
  right: var(--space-2xl);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast);
}

.search-close:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

/* ── Refresh Button ── */
.btn-refresh {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  background: transparent;
  cursor: pointer;
  transition: all var(--duration-fast);
}

.btn-refresh:hover {
  background: var(--color-accent);
  color: #FFFFFF;
}

.btn-refresh .icon {
  transition: transform var(--duration-normal);
}

.btn-refresh.loading .icon {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ── Back to top ── */
.btn-back-top {
  position: fixed;
  bottom: var(--space-2xl);
  right: var(--space-2xl);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #FFFFFF;
  box-shadow: 0 4px 16px var(--color-shadow-hover);
  z-index: calc(var(--z-nav) - 1);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all var(--duration-normal);
  font-size: 1.2rem;
}

.btn-back-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.btn-back-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--color-shadow-hover);
}