/* ==========================================================================
   Debian 中文社区 — index.css
   首页：Hero / 卡片 / 新闻 / 安全更新 / 侧栏 / 联系
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 标签页
   -------------------------------------------------------------------------- */
.tab-content {
  display: none;
}

.tab-content.tab-active {
  display: block;
  animation: fade-in 0.4s ease both;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   2. Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3rem, 8vw, 6rem);
  text-align: center;
  background: radial-gradient(60rem 30rem at 50% -10%, var(--accent-soft), transparent 70%);
  border-bottom: 1px solid var(--border);
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-600), var(--brand-300), transparent);
}

.hero-inner {
  width: min(var(--container), 100% - 2.5rem);
  margin-inline: auto;
  display: grid;
  justify-items: center;
  gap: 1rem;
}

.hero-logo {
  width: clamp(72px, 12vw, 110px);
  filter: drop-shadow(0 6px 16px rgba(168, 0, 48, 0.18));
}

.hero-title {
  margin: 0;
  font-size: clamp(1.75rem, 4.5vw, 3rem);
  line-height: 1.2;
  font-weight: 700;
  text-wrap: balance;
}

.hero-title .brand-text {
  color: var(--primary);
}

.hero-lead {
  max-width: 65ch;
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 0.5rem;
}

/* --------------------------------------------------------------------------
   3. 按钮
   -------------------------------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button-primary {
  background: var(--primary);
  box-shadow: var(--shadow-sm);
  color: var(--primary-contrast);
}

.button-primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-md);
  color: var(--primary-contrast);
}

.button-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}

.button-ghost:hover {
  background: var(--surface-2);
  border-color: var(--primary);
  color: var(--text);
}

/* --------------------------------------------------------------------------
   4. 布局
   -------------------------------------------------------------------------- */
.layout-grid {
  width: min(var(--container), 100% - 2.5rem);
  margin-inline: auto;
  padding-block: clamp(1.5rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1.5rem;
  align-items: start;
}

.layout-main,
.layout-side {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

/* --------------------------------------------------------------------------
   5. 卡片
   -------------------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.1rem, 2.5vw, 1.5rem);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card > h2:first-child,
.card > h3:first-child {
  margin-top: 0;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.section-title::before {
  content: "";
  flex-shrink: 0;
  width: 4px;
  height: 1.1em;
  border-radius: 2px;
  background: var(--primary);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.card-header .section-title {
  font-size: 1.15rem;
}

.card-actions {
  display: flex;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.card-cta p {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   6. 新闻
   -------------------------------------------------------------------------- */
.news-list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-item {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.65rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.news-item:hover {
  background: var(--surface-2);
  border-color: var(--border);
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.news-title {
  color: var(--text);
  font-weight: 500;
  line-height: 1.5;
}

.news-title:hover {
  color: var(--primary);
}

.news-tag {
  justify-self: end;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 600;
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   7. 安全更新
   -------------------------------------------------------------------------- */
.update-list {
  display: grid;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.update-item {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.update-item:hover {
  background: var(--surface-2);
}

.update-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.update-title {
  overflow: hidden;
  color: var(--text);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.update-title:hover {
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   8. 链接列表
   -------------------------------------------------------------------------- */
.link-list {
  display: grid;
  gap: 0.375rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.link-list li {
  margin-block: 0;
}

/* 卡片标题与内容的统一间距 */
.card > .section-title {
  margin-bottom: 0.75rem;
}

/* 链接后的次要说明文字（如线路类型） */
.link-list .link-note {
  flex-shrink: 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.link-list a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text);
  transition: background var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast);
}

.link-list a::after {
  content: "→";
  margin-left: auto;
  color: var(--text-muted);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.link-list a:hover {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--primary);
  text-decoration: none;
}

.link-list a:hover::after {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   9. 联系
   -------------------------------------------------------------------------- */
#contact {
  padding-block: clamp(1.5rem, 4vw, 3rem);
}

#contact .card {
  width: min(var(--container), 100% - 2.5rem);
  margin-inline: auto;
}

#contact ol {
  display: grid;
  gap: 0.5rem;
  padding-left: 1.25rem;
}

#contact ol li {
  padding-left: 0.25rem;
}

/* --------------------------------------------------------------------------
   10. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .layout-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 760px) {
  .card-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .news-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.15rem;
  }

  .news-tag {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    width: 100%;
  }

  .hero-actions .button {
    flex: 1 1 100%;
  }
}