/**
 * 布局：容器、导航、页脚、网格
 */

.container {
  width: 100%;
  max-width: var(--page-width);
  margin-inline: auto;
  padding-inline: max(var(--space-5), env(safe-area-inset-left, 0px))
    max(var(--space-5), env(safe-area-inset-right, 0px));
}

.container--narrow {
  max-width: var(--content-width);
}

.container--wide {
  max-width: 80rem;
}

/* ========== 站点页头 / 导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: calc(var(--nav-height) + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--color-bg) 78%, transparent);
  backdrop-filter: saturate(1.2) blur(var(--header-blur));
  -webkit-backdrop-filter: saturate(1.2) blur(var(--header-blur));
  transition:
    border-color var(--duration) var(--ease-out),
    background var(--duration) var(--ease-out),
    box-shadow var(--duration) var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  column-gap: var(--space-4);
  height: var(--nav-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.03em;
  flex-shrink: 0;
  min-height: var(--tap-min);
  justify-self: start;
  min-width: 0;
}

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

.brand__mark {
  display: grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--color-primary), #3d8a64);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 800;
  box-shadow: 0 1px 2px rgba(47, 107, 79, 0.2);
  flex-shrink: 0;
}

.brand__text {
  white-space: nowrap;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: center;
  min-width: 0;
}

.nav__list {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* 覆盖全局 li 下边距，避免顶栏导航被顶歪 */
.nav__list > li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  padding: var(--space-2) 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  transition:
    color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out);
}

.nav__link:hover {
  color: var(--color-text);
  background: var(--color-primary-soft);
}

.nav__link.is-active {
  color: var(--color-primary);
  background: var(--color-primary-soft);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex-shrink: 0;
  justify-self: end;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  place-items: center;
  width: var(--tap-min);
  height: var(--tap-min);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition:
    border-color var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out);
}

.nav-toggle:hover {
  border-color: var(--color-border-strong);
}

.nav-toggle__icon {
  width: 1.15rem;
  height: 1.15rem;
}

/* ========== 主内容区 ========== */
.site-main {
  min-height: calc(100vh - var(--nav-height) - 12rem);
  min-height: calc(100dvh - var(--nav-height) - 12rem);
  padding-block: var(--space-10) var(--space-16);
}

.page-header {
  margin-bottom: var(--space-10);
}

.page-header__title {
  margin-bottom: var(--space-3);
  letter-spacing: -0.03em;
}

.page-header__desc {
  color: var(--color-text-muted);
  font-size: clamp(var(--text-base), 1.5vw, var(--text-lg));
  line-height: var(--leading-relaxed);
  max-width: 38rem;
  margin: 0;
}

/* ========== 页脚 ========== */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 92%, var(--color-bg));
  padding-block: var(--space-10) var(--space-8);
  padding-bottom: max(var(--space-8), env(safe-area-inset-bottom, 0px));
}

.site-footer__inner {
  display: grid;
  gap: var(--space-7, var(--space-8));
}

.site-footer__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-6) var(--space-10);
}

.site-footer__brand {
  max-width: 28rem;
}

.site-footer__brand .brand {
  margin-bottom: var(--space-3);
}

.site-footer__note {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin: 0;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__nav > li {
  margin: 0;
}

.site-footer__nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  min-height: 2rem;
  display: inline-flex;
  align-items: center;
}

.site-footer__nav a:hover {
  color: var(--color-primary);
}

.site-footer__disclaimer {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--color-primary-soft) 70%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-primary) 12%, transparent);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: var(--leading-relaxed);
}

.site-footer__disclaimer strong {
  color: var(--color-text);
  font-weight: 600;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
}

/* ========== 网格 ========== */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17.5rem), 1fr));
  gap: var(--space-5) var(--space-6);
}

.grid-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr));
  gap: var(--space-5);
}

/* ========== 响应式导航 ========== */
@media (max-width: 960px) {
  .nav-toggle {
    display: grid;
  }

  .site-header__inner {
    display: flex;
    justify-content: space-between;
    column-gap: var(--space-3);
  }

  .nav {
    position: fixed;
    inset: calc(var(--nav-height) + env(safe-area-inset-top, 0px)) 0 auto 0;
    display: none;
    justify-self: stretch;
    padding: var(--space-3) max(var(--space-5), env(safe-area-inset-right, 0px))
      var(--space-5) max(var(--space-5), env(safe-area-inset-left, 0px));
    background: color-mix(in srgb, var(--color-surface) 96%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    max-height: calc(100dvh - var(--nav-height) - env(safe-area-inset-top, 0px));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .nav.is-open {
    display: block;
    animation: nav-slide-in var(--duration) var(--ease-out);
  }

  @keyframes nav-slide-in {
    from {
      opacity: 0;
      transform: translateY(-0.35rem);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .nav__link {
    min-height: var(--tap-min);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    border-radius: var(--radius);
  }

  .brand__text {
    font-size: var(--text-base);
  }
}

/* 中等桌面宽度：导航略收紧，避免「关于」被挤出 */
@media (min-width: 961px) and (max-width: 1100px) {
  .nav__link {
    padding-inline: 0.5rem;
    font-size: 0.8125rem;
  }

  .brand__text {
    font-size: var(--text-base);
  }
}

@media (max-width: 640px) {
  .container {
    padding-inline: max(var(--space-4), env(safe-area-inset-left, 0px))
      max(var(--space-4), env(safe-area-inset-right, 0px));
  }

  .site-main {
    padding-block: var(--space-7, var(--space-8)) var(--space-12);
  }

  .page-header {
    margin-bottom: var(--space-8);
  }

  .page-header__desc {
    font-size: var(--text-base);
  }

  .site-footer {
    padding-block: var(--space-8) var(--space-6);
    padding-bottom: max(var(--space-6), env(safe-area-inset-bottom, 0px));
  }

  .site-footer__top {
    flex-direction: column;
    gap: var(--space-5);
  }

  .site-footer__disclaimer {
    padding: var(--space-3);
    font-size: 0.7rem;
    line-height: 1.7;
  }

  .grid-cards {
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  .site-main {
    padding-block: var(--space-6) var(--space-10);
  }

  .brand__text {
    max-width: 9.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

/* 宽屏：内容区更舒展 */
@media (min-width: 1100px) {
  .site-main {
    padding-block: var(--space-12) var(--space-20);
  }

  .grid-cards {
    gap: var(--space-6) var(--space-7, 1.75rem);
  }
}