/* ==========================================================================
   Slide deck shell — sidebar, header, footer, slide canvas, navigation
   ========================================================================== */

/* App grid: sidebar | (header / main / footer) */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: 100vh;
  min-height: 100vh;
  background: var(--vp-surface);
}

/* ============================ SIDEBAR ============================ */
.app-sidebar {
  background: var(--vp-white);
  border-right: 1px solid var(--vp-ink-100);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 30;
  overflow: hidden;
}

.sb-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--vp-ink-100);
  background: linear-gradient(135deg, var(--vp-teal-50), var(--vp-white));
}
.sb-brand img { width: 40px; height: 40px; }
.sb-brand .sb-brand-text { line-height: 1.15; }
.sb-brand .sb-brand-name {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--vp-ink-900);
  letter-spacing: -0.01em;
}
.sb-brand .sb-brand-sub {
  font-size: 0.7rem;
  color: var(--vp-teal-600);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 2px;
}

.sb-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 16px;
}

/* Group */
.sb-group { padding: 6px 12px 0; }
.sb-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 10px;
  cursor: pointer;
  user-select: none;
  border-radius: var(--vp-r);
  transition: background 0.15s;
}
.sb-group-header:hover { background: var(--vp-teal-50); }
.sb-group-title {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--vp-ink-500);
  text-transform: uppercase;
}
.sb-group-count {
  font-size: 0.65rem;
  color: var(--vp-ink-400);
  background: var(--vp-ink-50);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 700;
}
.sb-group-chevron {
  margin-left: 8px;
  width: 14px;
  height: 14px;
  color: var(--vp-ink-400);
  transition: transform 0.2s;
}
.sb-group.is-collapsed .sb-group-chevron { transform: rotate(-90deg); }
.sb-group.is-collapsed .sb-group-items { display: none; }

.sb-group-items {
  list-style: none;
  margin: 4px 0 8px;
  padding: 0;
}

.sb-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px 8px 12px;
  border-radius: var(--vp-r);
  font-size: 0.85rem;
  color: var(--vp-ink-700);
  text-decoration: none;
  transition: all 0.15s;
  margin: 1px 0;
  position: relative;
}
.sb-item:hover {
  background: var(--vp-teal-50);
  color: var(--vp-teal-700);
  text-decoration: none;
}
.sb-item.is-active {
  background: linear-gradient(90deg, var(--vp-teal-600), var(--vp-teal-700));
  color: var(--vp-white);
  font-weight: 600;
  box-shadow: 0 4px 14px -4px rgba(13, 131, 137, 0.5);
}
.sb-item .sb-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 22px;
  padding: 0 6px;
  font-size: 0.7rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  border-radius: 6px;
  background: var(--vp-ink-50);
  color: var(--vp-ink-500);
}
.sb-item.is-active .sb-num {
  background: rgba(255,255,255,0.18);
  color: var(--vp-white);
}
.sb-item:hover .sb-num { background: var(--vp-teal-100); color: var(--vp-teal-700); }
.sb-item.is-active:hover .sb-num { background: rgba(255,255,255,0.25); color: var(--vp-white); }
.sb-item .sb-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sb-foot {
  padding: 12px 16px;
  border-top: 1px solid var(--vp-ink-100);
  font-size: 0.7rem;
  color: var(--vp-ink-400);
  background: var(--vp-ink-50);
}

/* Mobile sidebar toggle */
.sb-mobile-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 50;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--vp-white);
  box-shadow: var(--vp-shadow);
  align-items: center;
  justify-content: center;
  color: var(--vp-teal-600);
}

/* ============================ MAIN ============================ */
.app-main {
  display: grid;
  grid-template-rows: var(--header-h) 1fr var(--footer-h);
  min-height: 100vh;
  height: 100vh;
  overflow: hidden;
}

/* ---------- HEADER ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  background: var(--vp-white);
  border-bottom: 1px solid var(--vp-ink-100);
  box-shadow: var(--vp-shadow-sm);
  z-index: 20;
}
.hd-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1;
}
.hd-eyebrow {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--vp-teal-600);
  font-weight: 700;
}
.hd-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--vp-ink-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.hd-divider {
  width: 1px;
  height: 24px;
  background: var(--vp-ink-100);
}
.hd-progress-wrap {
  flex: 1;
  max-width: 420px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.hd-progress {
  flex: 1;
  height: 8px;
  background: var(--vp-ink-100);
  border-radius: 999px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.hd-progress-bar {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--vp-teal-500), var(--vp-teal-700));
  border-radius: 999px;
  transition: width 0.3s ease;
  width: 0;
}
.hd-progress-text {
  font-size: 0.78rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--vp-ink-700);
  white-space: nowrap;
}
.hd-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.hd-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--vp-teal-50);
  color: var(--vp-teal-700);
  font-size: 0.78rem;
  font-weight: 600;
}

/* ---------- FOOTER ---------- */
.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  background: linear-gradient(135deg, var(--vp-teal-700), var(--vp-teal-800));
  color: rgba(255,255,255,0.85);
  font-size: 0.78rem;
  z-index: 20;
}
.ft-left, .ft-center, .ft-right { display: flex; align-items: center; gap: 8px; }
.ft-center { gap: 16px; }
.ft-mark {
  width: 18px; height: 18px;
}
.ft-tagline {
  font-style: italic;
  letter-spacing: 0.06em;
}
.ft-link { color: rgba(255,255,255,0.85); }
.ft-link:hover { color: var(--vp-white); }

/* ---------- MAIN BODY ---------- */
.app-body {
  position: relative;
  overflow: auto;
  padding: 24px 28px;
  background: var(--vp-surface);
  /* subtle dotted background pattern */
  background-image: radial-gradient(circle at 1px 1px, rgba(13, 131, 137, 0.06) 1px, transparent 0);
  background-size: 24px 24px;
}

/* ---------- SLIDE CANVAS ---------- */
.slide {
  background: var(--vp-white);
  border-radius: var(--vp-r-lg);
  box-shadow: var(--vp-shadow-md);
  padding: var(--slide-pad);
  min-height: calc(100vh - var(--header-h) - var(--footer-h) - 48px - 56px); /* room for nav buttons */
  margin: 0 auto;
  max-width: 1400px;
  position: relative;
  overflow: hidden;
}

.slide-header {
  margin-bottom: 24px;
}
.slide-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.slide-eyebrow .se-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--vp-teal-50);
  color: var(--vp-teal-700);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 999px;
  border: 1px solid var(--vp-teal-100);
}
.slide-eyebrow .se-num {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--vp-ink-400);
  font-variant-numeric: tabular-nums;
}
.slide-title {
  font-size: clamp(1.6rem, 2.4vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--vp-ink-900);
  margin: 0;
}
.slide-title .accent { color: var(--vp-teal-600); }
.slide-sub {
  margin-top: 8px;
  font-size: 1rem;
  color: var(--vp-ink-500);
  max-width: 800px;
}

.slide-body {
  margin-top: 24px;
}

/* Cover variant */
.slide.is-cover {
  background: radial-gradient(ellipse at top right, var(--vp-teal-100), var(--vp-white) 60%);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- NAV BUTTONS ---------- */
.nav-buttons {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1400px;
  margin: 16px auto 0;
}
.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--vp-white);
  color: var(--vp-teal-700);
  font-weight: 600;
  font-size: 0.88rem;
  border: 1px solid var(--vp-ink-100);
  box-shadow: var(--vp-shadow-sm);
  text-decoration: none;
  transition: all 0.15s;
}
.nav-btn:hover {
  background: var(--vp-teal-600);
  color: var(--vp-white);
  border-color: var(--vp-teal-600);
  box-shadow: 0 6px 18px -6px rgba(13, 131, 137, 0.45);
  text-decoration: none;
}
.nav-btn.is-disabled {
  opacity: 0.4;
  pointer-events: none;
}
.nav-btn.is-primary {
  background: var(--vp-teal-600);
  color: var(--vp-white);
  border-color: var(--vp-teal-600);
}
.nav-btn.is-primary:hover {
  background: var(--vp-teal-700);
  border-color: var(--vp-teal-700);
}
.nav-btn .nav-meta {
  font-size: 0.7rem;
  font-weight: 500;
  opacity: 0.7;
  display: block;
}

/* ---------- ANIMATIONS ---------- */
@keyframes vp-fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes vp-slide-up {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes vp-slide-right {
  from { opacity: 0; transform: translateX(-12px); }
  to   { opacity: 1; transform: translateX(0); }
}

.slide { animation: vp-fade-in 0.25s ease both; }
.slide-header { animation: vp-slide-up 0.3s ease 0.05s both; }
.slide-body > * { animation: vp-slide-up 0.35s ease both; }
.slide-body > *:nth-child(1) { animation-delay: 0.1s; }
.slide-body > *:nth-child(2) { animation-delay: 0.18s; }
.slide-body > *:nth-child(3) { animation-delay: 0.26s; }
.slide-body > *:nth-child(4) { animation-delay: 0.32s; }
.slide-body > *:nth-child(5) { animation-delay: 0.38s; }
.slide-body > *:nth-child(6) { animation-delay: 0.44s; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .app-shell { grid-template-columns: 1fr; }
  .app-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-w);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: var(--vp-shadow-lg);
  }
  .app-sidebar.is-open { transform: translateX(0); }
  .sb-mobile-toggle { display: inline-flex; }
  .app-main { padding-top: 0; }
  .hd-progress-wrap { display: none; }
  .slide { padding: 28px 24px; }
}

@media (max-width: 640px) {
  :root { --slide-pad: 22px; --header-h: 56px; }
  .app-body { padding: 16px; }
  .slide { border-radius: var(--vp-r-md); }
  .nav-btn { padding: 8px 14px; font-size: 0.82rem; }
  .nav-btn .nav-meta { display: none; }
  .ft-center { display: none; }
}