/* 基于 Stack 改造 Demo 的背景和卡片样式适配，2026-10-07。
   许可 GPL-3.0-only；来源与完整许可见 vendor/stack-remodel/。 */
:root {
  --bg: #eef2ef;
  --ink: #25332d;
  --muted: #79857e;
  --accent: #315b4b;
  --line: #e7ece8;
  --tag: #edf2ee;
  --shadow: 0 5px 26px rgba(38, 67, 51, .04);
  --sidebar: clamp(220px, 20vw, 300px);
  --layout-gap: clamp(20px, 2.3vw, 42px);
  --layout-padding: clamp(17px, 3.2vw, 64px);
}
body {
  background-image: linear-gradient(rgba(238, 242, 239, .68), rgba(238, 242, 239, .68)), url('../media/backgrounds/coast.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}
.mobile-sidebar-controls {display: none;}
.site-shell {
  width: 100%;
  max-width: 1680px;
  gap: var(--layout-gap);
  padding: 40px var(--layout-padding) 48px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: var(--sidebar-top, 24px);
  align-self: start;
  height: auto;
  max-height: none;
  overflow: visible;
  padding: 26px 22px 20px;
  background: var(--card);
  border: 1px solid rgba(89, 115, 100, .1);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.profile {display: flex; flex-direction: row; align-items: center; gap: 13px; text-align: left;}
.profile-avatar {flex: 0 0 58px;}
.profile img {display: block; width: 58px; height: 58px; margin: 0;}
.profile-meta {display: flex; flex-direction: column; gap: 7px; min-width: 0;}
.profile strong {font-size: 22px; letter-spacing: .12em; line-height: 1.2;}
.profile-eyebrow {margin: 0; color: var(--muted); font-size: 11px; letter-spacing: .16em;}
.profile-description {margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6;}
.socials {display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 18px 0 20px; gap: 8px;}
.socials a {display: flex; align-items: center; justify-content: center; width: 100%; max-width: 34px; height: 32px; padding: 0; justify-self: center; border-radius: 9px; background: var(--tag); color: var(--accent);}
.socials svg {width: 20px; height: 20px;}
.sidebar-appearance {display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line);}
.sidebar-appearance button {display: inline-flex; align-items: center; justify-content: center; width: 100%; gap: 5px; padding: 0; border: 0; background: none; color: var(--muted); font-size: 11.5px; white-space: nowrap;}
.sidebar-appearance button:hover, .sidebar-appearance button[aria-pressed="true"] {color: var(--accent);}
.sidebar-appearance svg {width: 16px; height: 16px;}
.main-nav svg {width: 18px; height: 18px;}
.sidebar-toc {padding: 15px 0; margin-bottom: 18px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 11px;}
.sidebar-toc #TableOfContents a {overflow-wrap: anywhere;}
.article-layout {display: block;}
.article-toolbar {display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 12px;}
.article-toolbar .post-meta {justify-content: flex-end;}
.article-back {display: inline-flex; align-items: center; gap: 6px; flex-shrink: 0; padding: 5px 10px; border-radius: 7px; background: var(--tag); color: var(--accent); font-size: 12px;}
.article-back svg {width: 16px; height: 16px;}
.article-back:hover {box-shadow: inset 0 0 0 1px var(--accent);}
.main-nav {grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px; padding-bottom: 18px;}
.main-nav a {gap: 6px; padding: 9px 7px; font-size: 12px; white-space: nowrap;}
.main-nav svg {width: 17px; height: 17px;}
.sidebar-group {margin: 0; padding: 10px 0; border-bottom: 1px solid var(--line);}
.sidebar-player + .sidebar-group {margin-top: 18px; border-top: 1px solid var(--line);}
.sidebar-group summary {display: flex; align-items: center; gap: 7px; min-height: 22px; list-style: none; cursor: pointer; font-size: 13px; font-weight: 600;}
.sidebar-group summary::-webkit-details-marker {display: none;}
.sidebar-group summary::before {content: ''; width: 0; height: 0; border-top: 4px solid transparent; border-bottom: 4px solid transparent; border-left: 5px solid currentColor; flex-shrink: 0; transition: transform .15s;}
.sidebar-group[open] > summary::before {transform: rotate(90deg);}
.sidebar-group summary span {margin-left: auto; font-size: 11px; font-weight: 400; color: var(--muted);}
.sidebar-group summary:focus-visible {outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 3px;}
.sidebar-group .category-list, .sidebar-group .tag-cloud {margin-top: 10px;}
.sidebar-preview {max-height: 128px; overflow: hidden;}
#sidebar-categories .category-list {grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 5px;}
#sidebar-categories .category-list a {gap: 4px; padding: 5px; border-radius: 5px; background: var(--tag); font-size: 11px;}
#sidebar-categories .category-list a span {overflow-wrap: anywhere;}
.sidebar-more {display: inline-block; margin-top: 10px; color: var(--accent); font-size: 11px;}
.main-nav a, .category-list a {color: #68766e;}
.main-nav a.active, .main-nav a:hover, .tag-cloud a {background: var(--tag);}
.tag-cloud a {color: #68766e;}
.tag-cloud a:hover {background: #e1eae3;}
.blog-intro {
  padding: 34px 38px 28px;
  background: var(--card);
  border: 1px solid rgba(89, 115, 100, .1);
  border-radius: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.intro-kicker {margin: 0 0 16px; color: var(--accent); font-size: 11px; letter-spacing: .23em;}
.blog-intro h1 {margin: 0; font-size: 35px; line-height: 1.4; letter-spacing: .025em; font-weight: 600;}
.intro-description {margin: 18px 0 24px; font-size: 14px; color: #68766e; line-height: 1.7;}
.intro-bottom {display: flex; justify-content: space-between; gap: 16px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 11px; color: var(--muted);}
.intro-bottom a {color: var(--accent); white-space: nowrap;}
.feed-heading {display: flex; justify-content: space-between; align-items: center; gap: 16px; margin: 0 2px 15px;}
.feed-heading h2 {margin: 0; font-size: 18px; font-weight: 600;}
.feed-heading > span {color: #68766e; font-size: 11px;}
.post-card {border-radius: 18px; border-color: rgba(89, 115, 100, .1);}
.post-card.pinned {border-color: #cbdcd1;}
.post-card:hover {box-shadow: 0 10px 35px rgba(38, 67, 51, .08);}
.pin-badge {background: var(--tag);}
.post-cover {background: var(--tag);}
.post-tags {color: var(--muted);}
.page-heading {padding: 25px 28px; background: var(--card); border-radius: 18px; box-shadow: var(--shadow);}
.article-panel, .archive-panel, .taxonomy-grid a {border-radius: 18px;}
.reading-line {background: var(--line);}
#TableOfContents a {border-color: var(--line);}
.page-footer {color: #79857e;}
.aplayer .aplayer-pic {background-color: var(--accent) !important;}
body.dark {
  --bg: #19231d;
  --card: #26342d;
  --ink: #e1eae4;
  --muted: #96a69b;
  --accent: #b8dbc6;
  --line: #3b4b40;
  --tag: #324539;
  background-image: linear-gradient(rgba(20, 34, 26, .64), rgba(20, 34, 26, .64)), url('../media/backgrounds/coast.jpg');
}
body[data-background="landscape"] {background-image: url('../media/landscape.svg');}
body.dark[data-background="landscape"] {background-image: linear-gradient(rgba(20, 34, 26, .88), rgba(20, 34, 26, .9)), url('../media/landscape.svg');}
/* 摄影背景叠加柔和遮罩，使卡片之外的文字仍然清晰。 */
body[data-photo] {background-image: linear-gradient(rgba(238, 242, 239, .68), rgba(238, 242, 239, .68)), var(--background-photo);}
body.dark[data-photo] {background-image: linear-gradient(rgba(20, 34, 26, .64), rgba(20, 34, 26, .64)), var(--background-photo);}
body[data-background="solid"], body.dark[data-background="solid"] {background-image: none;}
body.dark .main-nav a, body.dark .category-list a, body.dark .tag-cloud a,
body.dark .intro-description, body.dark .feed-heading > span {color: #b0beb5;}
body.dark .main-nav a.active, body.dark .main-nav a:hover, body.dark .tag-cloud a,
body.dark .pin-badge {background: var(--tag);}
body.dark .main-nav a.active {color: var(--accent);}
body.dark .post-card.pinned {border-color: #526b5b;}
body.dark .page-footer {color: var(--muted);}
@media (max-width: 1150px) {
  .sidebar {padding: 24px 18px;}
}
@media (max-width: 900px) {
  .sidebar {padding: 22px 16px;}
  .profile {gap: 10px;}
  .profile strong {font-size: 20px;}
  .blog-intro {padding: 28px 26px 24px;}
  .blog-intro h1 {font-size: 29px;}
}
@media (max-width: 720px) {
  .mobile-sidebar-controls {display: flex; position: sticky; top: 12px; z-index: 40; width: fit-content; margin: 16px 17px 0;}
  #sidebar-toggle {display: inline-flex; align-items: center; gap: 7px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--accent); box-shadow: var(--shadow); font-size: 12px;}
  #sidebar-toggle svg {width: 18px; height: 18px;}
  .sidebar-appearance button {min-height: 30px;}
  .site-shell {padding: 12px 17px 40px;}
  .sidebar {display: none; position: static; top: auto; width: 100%; height: auto; max-height: none; padding: 24px 22px; margin-bottom: 24px; background: var(--card); box-shadow: var(--shadow);}
  .mobile-sidebar-open .sidebar {display: block;}
  .blog-intro {padding: 25px 24px 22px;}
  .blog-intro h1 {font-size: 28px;}
  .intro-description {font-size: 12px;}
  .intro-bottom {font-size: 10px; gap: 10px;}
  .feed-heading h2 {font-size: 17px;}
  .feed-heading > span {font-size: 10px;}
  .page-heading {padding: 22px;}
}

.article-series {display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; font-size: 12px; color: var(--muted);}
.article-series a {color: var(--accent);}
.series-description {margin: 0 0 22px; font-size: 13px; line-height: 1.9; color: var(--muted);}
.series-intro {margin-bottom: 22px;}