/* ============================================================
   iSpaceDoc Layout System
   Grid, header, sidebar, main content, footer
   ============================================================ */
/* ---- App Shell ---- */
.ispace-app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-size: var(--ispace-font-base);
}

.ispace-main-content {
  flex: 1;
  max-width: var(--ispace-content-max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--ispace-space-6) var(--ispace-space-4);
  transition: max-width var(--ispace-duration-normal) var(--ispace-ease-out);
}

/* With sidebar */
.ispace-app-layout.has-sidebar {
  display: grid;
  grid-template-columns: var(--ispace-sidebar-width) 1fr;
  grid-template-rows: 1fr auto;
  grid-template-areas:
    "sidebar main"
    "sidebar footer";
  padding-top: var(--ispace-header-height);
  transition: grid-template-columns var(--ispace-duration-normal) var(--ispace-ease-out);
}

.ispace-app-layout.has-sidebar.ispace-layout--sidebar-collapsed {
  grid-template-columns: var(--ispace-sidebar-collapsed-width) 1fr;
}

.ispace-app-layout.has-sidebar .ispace-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  grid-area: auto;
}

.ispace-app-layout.has-sidebar .ispace-sidebar {
  grid-area: sidebar;
}

.ispace-app-layout.has-sidebar .ispace-main-content {
  grid-area: main;
}

.ispace-app-layout.has-sidebar .ispace-footer {
  grid-area: footer;
}

/* ---- Header ---- */
.ispace-header {
  position: sticky;
  top: 0;
  z-index: var(--ispace-z-sticky);
  height: var(--ispace-header-height);
  background: var(--ispace-color-surface-0);
  border-bottom: 1px solid var(--ispace-color-border-light);
  display: flex;
  align-items: center;
  padding: 0 var(--ispace-space-6);
}

.ispace-header-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: none;
}

.ispace-header-left,
.ispace-header-right {
  display: flex;
  align-items: center;
  gap: var(--ispace-space-3);
}

.ispace-header-center {
  flex: 1;
}

/* ---- Logo ---- */
.ispace-logo {
  font-family: 'Ma Shan Zheng', 'STXingkai', 'KaiTi', cursive, sans-serif;
  font-size: var(--ispace-font-2xl);
  color: var(--ispace-color-text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--ispace-space-2);
}

.ispace-logo:hover {
  text-decoration: none;
  color: var(--ispace-color-brand-500);
}


/* ---- Sidebar ---- */
.ispace-sidebar {
  position: sticky;
  top: var(--ispace-header-height);
  height: calc(100vh - var(--ispace-header-height));
  overflow-y: auto;
  overflow-x: auto;
  background: var(--ispace-color-surface-0);
  border-right: 1px solid var(--ispace-color-border-light);
  padding: var(--ispace-space-4);
  z-index: var(--ispace-z-sidebar);
}

.ispace-sidebar-nav {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--ispace-space-1);
  min-height: 100%;
}

.ispace-sidebar-link {
  display: flex;
  align-items: center;
  gap: var(--ispace-space-2);
  padding: var(--ispace-space-2) var(--ispace-space-3);
  font-size: var(--ispace-font-base);
  color: var(--ispace-color-text-secondary);
  border-radius: var(--ispace-radius-md);
  transition: all var(--ispace-duration-fast);
  text-decoration: none;
}

.ispace-sidebar-link:hover {
  background: var(--ispace-color-surface-100);
  color: var(--ispace-color-text-primary);
  text-decoration: none;
}

.ispace-sidebar-link.ispace-active {
  background: var(--ispace-color-brand-50);
  color: var(--ispace-color-brand-500);
  font-weight: var(--ispace-font-medium);
}

.ispace-sidebar-doc-icon {
  flex-shrink: 0;
  color: var(--ispace-color-text-quaternary);
}

.ispace-sidebar-item {
  margin-bottom: 1px;
}

.ispace-sidebar-toggle {
  position: absolute;
  right: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--ispace-color-text-quaternary, #9ca3af);
  border-radius: var(--ispace-radius-md);
  opacity: 0.35;
  transition: opacity var(--ispace-duration-fast), color var(--ispace-duration-fast);
  z-index: 1;
}
.ispace-sidebar-toggle:hover {
  opacity: 1;
  color: var(--ispace-color-text-secondary, #374151);
  background: var(--ispace-color-surface-100, #f1f5f9);
}
.ispace-sidebar-toggle svg {
  transition: transform var(--ispace-duration-normal) var(--ispace-ease-out);
}

.ispace-sidebar-empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--ispace-space-6);
  min-height: 80px;
}

/* ---- Footer ---- */
.ispace-footer {
  background: var(--ispace-color-surface-0);
  border-top: 1px solid var(--ispace-color-border-light);
  padding: 0 var(--ispace-space-6);
}

.ispace-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--ispace-content-max-width);
  margin: 0 auto;
  height: 44px;
  font-size: var(--ispace-font-sm);
}

/* Left group */
.ispace-footer-start {
  display: flex;
  align-items: center;
  gap: var(--ispace-space-2);
  flex-shrink: 0;
  min-width: 0;
}

/* Right group */
.ispace-footer-end {
  display: flex;
  align-items: center;
  gap: var(--ispace-space-4);
  flex-shrink: 0;
}

/* Brand name */
.ispace-footer-brand {
  font-weight: var(--ispace-font-semibold);
  color: var(--ispace-color-text-primary);
  white-space: nowrap;
}

/* Divider between brand and tagline */
.ispace-footer-divider {
  color: var(--ispace-color-border-medium);
  user-select: none;
}

/* Tagline */
.ispace-footer-tagline {
  color: var(--ispace-color-text-quaternary);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Base text item */
.ispace-footer-text {
  color: var(--ispace-color-text-quaternary);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Clickable links — keep inline-flex so SVG icons align vertically */
.ispace-footer-link {
  color: var(--ispace-color-text-quaternary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 0.15s;
}
.ispace-footer-link:hover {
  color: var(--ispace-color-brand-500);
}

/* ---- Page layout helpers ---- */
.ispace-page-header {
  margin-bottom: var(--ispace-space-6);
}

.ispace-page-title {
  font-size: var(--ispace-font-2xl);
  font-weight: var(--ispace-font-bold);
}

.ispace-page-description {
  color: var(--ispace-color-text-tertiary);
  margin-top: var(--ispace-space-1);
}

.ispace-content-card {
  background: var(--ispace-color-surface-0);
  border: 1px solid var(--ispace-color-border-light);
  border-radius: var(--ispace-radius-lg);
  padding: var(--ispace-space-6);
  box-shadow: var(--ispace-shadow-sm);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) and (min-width: 769px) {
  .ispace-sidebar-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  .ispace-app-layout.has-sidebar {
    grid-template-columns: 1fr;
    grid-template-areas:
      "main";
  }

  .ispace-app-layout.has-sidebar .ispace-sidebar {
    display: none;
  }

  .ispace-footer-inner {
    flex-direction: column;
    gap: var(--ispace-space-2);
    height: auto;
    padding: var(--ispace-space-3) 0;
  }
  .ispace-footer-start,
  .ispace-footer-end {
    justify-content: center;
  }
  .ispace-footer-tagline {
    display: none;
  }

  .ispace-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 0 var(--ispace-space-3);
  }

  .ispace-header-container {
    gap: var(--ispace-space-2);
  }

  .ispace-header-center {
    display: none;
  }

  .ispace-main-content {
    padding: var(--ispace-space-4) var(--ispace-space-3);
  }

  .ispace-logo {
    font-size: var(--ispace-font-base);
    gap: var(--ispace-space-1);
  }

  .ispace-logo svg {
    width: 22px;
    height: 22px;
  }
}

@media (max-width: 480px) {
  .ispace-header-right .ispace-btn-sm {
    padding: 4px 8px;
    font-size: var(--ispace-font-xs);
  }
}