/* ==========================================================================
   XFM Theme · layout.css
   骨架：顶栏 / 抽屉 / 主体栅格 / 侧栏 / 页脚 / 悬浮件
   ========================================================================== */

/* --------------------------------------------------------------------------
   阅读进度条
   -------------------------------------------------------------------------- */
.reading-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-progress);
  height: 3px;
  pointer-events: none;
}

.reading-progress i {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--xfm-primary), color-mix(in srgb, var(--xfm-primary) 55%, #a855f7));
  box-shadow: 0 0 10px rgba(var(--xfm-primary-rgb), 0.55);
  transition: width 0.1s linear;
}

/* --------------------------------------------------------------------------
   顶部导航
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--xfm-nav-h);
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  transition: transform var(--t-base) var(--ease), background-color var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.site-header.is-glass {
  background: color-mix(in srgb, var(--c-surface) 76%, transparent);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
}

.site-header.is-pinned {
  box-shadow: var(--shadow-sm);
}

.site-header.is-hidden {
  transform: translate3d(0, -100%, 0);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---- 品牌区 ---- */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: none;
  color: var(--c-text);
  font-weight: 700;
}

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

.brand-logo {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--xfm-primary), color-mix(in srgb, var(--xfm-primary) 40%, #8b5cf6));
  box-shadow: 0 6px 16px rgba(var(--xfm-primary-rgb), 0.34);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title {
  font-size: 16px;
  letter-spacing: -0.01em;
}

.brand-tagline {
  font-size: 11px;
  font-weight: 500;
  color: var(--c-text-muted);
  letter-spacing: 0.02em;
}

/* ---- 菜单 ---- */
.nav-menu {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  position: relative;
}

.nav-link,
.nav-text {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 38px;
  padding: 0 13px;
  border-radius: var(--xfm-radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-soft);
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.nav-link:hover,
.nav-text:hover {
  color: var(--c-text);
  background: var(--c-surface-hover);
}

.nav-link.is-active {
  color: var(--xfm-primary);
  background: var(--c-primary-bg);
}

.nav-text {
  cursor: default;
}

.nav-arrow {
  width: 13px;
  height: 13px;
  opacity: 0.6;
  transition: transform var(--t-base) var(--ease);
}

.nav-submenu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  z-index: 10;
  min-width: 168px;
  padding: 6px;
  background: var(--c-elevated);
  border: 1px solid var(--c-border);
  border-radius: var(--xfm-radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translate3d(-50%, -6px, 0) scale(0.98);
  transform-origin: top center;
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease),
    visibility var(--t-base);
}

.nav-item:hover > .nav-submenu {
  opacity: 1;
  visibility: visible;
  transform: translate3d(-50%, 0, 0) scale(1);
}

.nav-item:hover .nav-arrow {
  transform: rotate(180deg);
}

.nav-sub-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 11px;
  border-radius: calc(var(--xfm-radius-sm) + 1px);
  font-size: 13.5px;
  color: var(--c-text-soft);
  white-space: nowrap;
}

.nav-sub-link:hover {
  color: var(--xfm-primary);
  background: var(--c-primary-bg);
}

.nav-sub-link:hover .xfm-icon {
  transform: scale(1.06);
}

.nav-sub-link.is-active {
  color: var(--xfm-primary);
  background: var(--c-primary-bg);
  font-weight: 600;
}

/* ---- 工具区 ---- */
.nav-tools {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: none;
  margin-left: auto;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--xfm-radius-sm);
  color: var(--c-text-soft);
  transition: background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.icon-btn:hover {
  color: var(--xfm-primary);
  background: var(--c-surface-hover);
}

.icon-btn:active {
  transform: scale(0.94);
}

.icon-btn .xfm-icon {
  width: 19px;
  height: 19px;
}

.search-trigger {
  position: relative;
  width: auto;
  min-width: 38px;
  padding: 0 11px;
  gap: 8px;
  grid-auto-flow: column;
  background: var(--c-surface-hover);
}

.kbd-hint {
  font-size: 10.5px;
  padding: 0 5px;
  border-bottom-width: 1px;
}

/* 深浅色按钮：三态切换图标 */
.scheme-toggle .xfm-icon {
  position: absolute;
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}

.scheme-toggle {
  position: relative;
}

html[data-scheme-pref="auto"] .scheme-icon-light,
html[data-scheme-pref="auto"] .scheme-icon-dark,
html[data-scheme="light"]:not([data-scheme-pref="auto"]) .scheme-icon-dark,
html[data-scheme="light"]:not([data-scheme-pref="auto"]) .scheme-icon-auto,
html[data-scheme="dark"]:not([data-scheme-pref="auto"]) .scheme-icon-light,
html[data-scheme="dark"]:not([data-scheme-pref="auto"]) .scheme-icon-auto {
  opacity: 0;
  transform: scale(0.6) rotate(-40deg);
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   移动端抽屉
   -------------------------------------------------------------------------- */
.nav-toggle {
  display: none;
}

.drawer-mask {
  position: fixed;
  inset: 0;
  z-index: var(--z-drawer);
  background: rgba(10, 13, 20, 0.44);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-base) var(--ease), visibility var(--t-base);
}

.drawer {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-drawer);
  display: flex;
  flex-direction: column;
  width: min(300px, 84vw);
  height: 100%;
  padding: 18px 16px calc(18px + env(safe-area-inset-bottom));
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  box-shadow: var(--shadow-xl);
  transform: translate3d(-102%, 0, 0);
  transition: transform var(--t-base) var(--ease-out);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.drawer.is-open {
  transform: none;
}

.drawer-mask.is-open {
  opacity: 1;
  visibility: visible;
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
}

.drawer-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.drawer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--c-surface);
  box-shadow: 0 0 0 2px var(--c-border-strong);
}

.drawer-title {
  font-size: 15px;
  font-weight: 700;
}

.drawer-subtitle {
  font-size: 12px;
  color: var(--c-text-muted);
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 6px 0;
}

.drawer-link {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 11px 12px;
  border-radius: var(--xfm-radius-sm);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--c-text-soft);
}

.drawer-link:hover,
.drawer-link.is-active {
  color: var(--xfm-primary);
  background: var(--c-primary-bg);
}

.drawer-sub {
  padding-left: 34px;
  font-size: 13.5px;
  color: var(--c-text-muted);
}

.drawer-social {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--c-border);
  justify-content: flex-start;
}

/* --------------------------------------------------------------------------
   主体栅格
   -------------------------------------------------------------------------- */
.site-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 30px var(--gutter) 40px;
  align-items: start;
}

/* Blog + 侧边栏 */
body.has-sidebar.sidebar-right .site-body {
  grid-template-columns: minmax(0, 1fr) var(--widget-w);
}

body.has-sidebar.sidebar-left .site-body {
  grid-template-columns: var(--widget-w) minmax(0, 1fr);
}

body.has-sidebar.sidebar-left .content-column {
  order: 2;
}

body.has-sidebar.sidebar-left .widget-column {
  order: 1;
}

/* Notes / Docs：左导航 + 正文 */
body.mode-notes .site-body,
body.mode-docs .site-body {
  grid-template-columns: var(--nav-w) minmax(0, 1fr);
}

body.mode-notes.has-inline-toc .site-body,
body.mode-docs.has-inline-toc .site-body {
  grid-template-columns: var(--nav-w) minmax(0, 1fr) var(--toc-w);
}

.content-column {
  min-width: 0;
}

.content-wrap {
  max-width: var(--content-max);
  margin: 0 auto;
}

body.mode-blog .content-wrap {
  max-width: 100%;
}

/* --------------------------------------------------------------------------
   左侧文档/笔记导航
   -------------------------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: calc(var(--xfm-nav-h) + 22px);
  max-height: calc(100vh - var(--xfm-nav-h) - 44px);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.site-nav-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
  padding-right: 4px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.site-nav-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}

.site-nav-search {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 9px 12px;
  font-size: 13px;
  text-align: left;
  color: var(--c-text-muted);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--xfm-radius);
  box-shadow: var(--shadow-xs);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}

.site-nav-search:hover {
  color: var(--c-text-soft);
  border-color: var(--c-primary-soft);
  box-shadow: var(--shadow-sm);
}

.site-nav-search kbd {
  margin-left: auto;
  font-size: 10px;
}

/* 侧栏导航树 */
.xfm-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.xfm-nav-group {
  margin-bottom: 4px;
}

.xfm-nav-group-head {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 7px 9px;
  border-radius: var(--xfm-radius-sm);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-text-muted);
  text-align: left;
  text-transform: none;
}

.xfm-nav-group-head:hover {
  color: var(--c-text);
  background: var(--c-surface-hover);
}

.xfm-nav-group-title {
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.xfm-nav-group-count {
  padding: 0 6px;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--c-text-faint);
  background: var(--c-surface-hover);
  border-radius: 20px;
}

.xfm-nav-toggle {
  width: 14px;
  height: 14px;
  flex: none;
  opacity: 0.65;
  transition: transform var(--t-base) var(--ease);
}

.xfm-nav-group.is-collapsed .xfm-nav-toggle {
  transform: rotate(-90deg);
}

.xfm-nav-group.is-collapsed .xfm-nav-list {
  display: none;
}

.xfm-nav-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 2px 0 0;
  padding-left: 9px;
  border-left: 1px solid var(--c-border);
}

.xfm-nav-list.depth-1 {
  padding-left: 0;
  border-left: 0;
}

/* 多层文档树：逐级缩进，层级越深字号越收敛 */
.xfm-nav-list.depth-2 {
  padding-left: 11px;
}

.xfm-nav-list.depth-3 {
  padding-left: 10px;
  border-left-style: dashed;
}

.xfm-nav-list.depth-4,
.xfm-nav-list.depth-5 {
  padding-left: 10px;
  border-left-style: dashed;
}

.xfm-nav-list.depth-3 > .xfm-nav-item > .xfm-nav-link,
.xfm-nav-list.depth-4 > .xfm-nav-item > .xfm-nav-link,
.xfm-nav-list.depth-5 > .xfm-nav-item > .xfm-nav-link {
  padding: 6px 10px;
  font-size: 12.8px;
}

.xfm-nav-list.depth-2 > .xfm-nav-item > .xfm-nav-link {
  padding: 7px 10px;
}

.xfm-nav-item {
  position: relative;
}

.xfm-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 11px;
  border-radius: var(--xfm-radius-sm);
  font-size: 13.5px;
  color: var(--c-text-soft);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.xfm-nav-link:hover {
  color: var(--c-text);
  background: var(--c-surface-hover);
}

.xfm-nav-link.is-active {
  color: var(--xfm-primary);
  background: var(--c-primary-bg);
  font-weight: 600;
}

.xfm-nav-link.is-active::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 3px;
  height: 16px;
  border-radius: 3px;
  background: var(--xfm-primary);
  transform: translateY(-50%);
}

.xfm-nav-link-title {
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.xfm-nav-link-date {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--c-text-faint);
}

.xfm-nav-empty {
  padding: 14px 11px;
  font-size: 13px;
  color: var(--c-text-faint);
  background: var(--c-surface-alt);
  border: 1px dashed var(--c-border-strong);
  border-radius: var(--xfm-radius);
}

.xfm-notes-count {
  padding: 0 8px 10px 4px;
  font-size: 11.5px;
  color: var(--c-text-faint);
}

/* --------------------------------------------------------------------------
   右侧目录栏
   -------------------------------------------------------------------------- */
.toc-column {
  position: sticky;
  top: calc(var(--xfm-nav-h) + 22px);
  max-height: calc(100vh - var(--xfm-nav-h) - 44px);
  min-width: 0;
}

.toc-column-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 100%;
  padding: 14px 4px 14px 14px;
  border-left: 1px solid var(--c-border);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.toc-header {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}

/* --------------------------------------------------------------------------
   Blog 侧边挂件栏
   -------------------------------------------------------------------------- */
.widget-column {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

body.sidebar-sticky .widget-column {
  position: sticky;
  top: calc(var(--xfm-nav-h) + 22px);
  max-height: calc(100vh - var(--xfm-nav-h) - 44px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  padding-right: 2px;
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: 24px;
  padding: 30px 0 calc(30px + env(safe-area-inset-bottom));
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
}

.footer-inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.footer-custom {
  padding-bottom: 18px;
  text-align: center;
  color: var(--c-text-muted);
}

.footer-main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--c-border);
}

.footer-copyright {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  font-size: 14px;
  color: var(--c-text-soft);
}

.footer-copyright strong {
  color: var(--c-text);
}

.footer-runtime {
  color: var(--c-text-muted);
}

.footer-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--c-text-muted);
}

.footer-stats > span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.footer-social {
  display: flex;
  gap: 6px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 16px;
  font-size: 13px;
  color: var(--c-text-muted);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
}

.footer-record {
  display: flex;
  gap: 14px;
  font-size: 12.5px;
}

.footer-record a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--c-text-muted);
}

.footer-record a:hover {
  color: var(--xfm-primary);
}

/* --------------------------------------------------------------------------
   悬浮按钮 & 轻提示
   -------------------------------------------------------------------------- */
.floating-btn {
  position: fixed;
  right: calc(22px + env(safe-area-inset-right));
  bottom: calc(22px + env(safe-area-inset-bottom));
  z-index: var(--z-float);
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: var(--c-text-soft);
  background: var(--c-elevated);
  border: 1px solid var(--c-border);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translate3d(0, 12px, 0) scale(0.9);
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease),
    visibility var(--t-base), color var(--t-fast) var(--ease);
}

.floating-btn.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.floating-btn:hover {
  color: var(--xfm-primary);
  box-shadow: var(--shadow-lg);
}

.floating-btn .xfm-icon {
  width: 20px;
  height: 20px;
}

.xfm-toast {
  position: fixed;
  left: 50%;
  bottom: 76px;
  z-index: var(--z-toast);
  max-width: min(90vw, 420px);
  padding: 11px 18px;
  font-size: 13.5px;
  color: var(--c-text-invert);
  background: rgba(24, 30, 41, 0.94);
  border-radius: var(--xfm-radius);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translate3d(-50%, 14px, 0);
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease),
    visibility var(--t-base);
  pointer-events: none;
}

html[data-scheme="dark"] .xfm-toast {
  background: rgba(240, 244, 250, 0.94);
  color: #10141c;
}

.xfm-toast.is-show {
  opacity: 1;
  visibility: visible;
  transform: translate3d(-50%, 0, 0);
}

/* --------------------------------------------------------------------------
   图片灯箱
   -------------------------------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: var(--z-lightbox);
  display: grid;
  place-items: center;
  padding: 40px;
  background: rgba(10, 13, 20, 0.88);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-base) var(--ease), visibility var(--t-base);
  cursor: zoom-out;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: min(100%, 1200px);
  max-height: 88vh;
  object-fit: contain;
  border-radius: var(--xfm-radius-sm);
  box-shadow: var(--shadow-xl);
  transform: scale(0.96);
  transition: transform var(--t-base) var(--ease-out);
  cursor: default;
}

.lightbox.is-open .lightbox-img {
  transform: none;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 22px;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.22);
  transform: rotate(90deg);
}

.lightbox-caption {
  position: absolute;
  left: 50%;
  bottom: 24px;
  max-width: min(84vw, 720px);
  padding: 8px 16px;
  font-size: 13px;
  text-align: center;
  color: rgba(255, 255, 255, 0.86);
  background: rgba(0, 0, 0, 0.4);
  border-radius: 20px;
  transform: translateX(-50%);
}

.lightbox-caption:empty {
  display: none;
}