/* ===== Shell Layout ===== */

.shell {
  --sidebar-collapsed-width: 72px;
  display: flex;
  min-height: 100vh;
}

.shell-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  z-index: 40;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.shell-main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

body.sidebar-collapsed .shell-sidebar {
  width: var(--sidebar-collapsed-width);
  overflow: visible;
}

body.sidebar-collapsed .shell-main {
  margin-left: var(--sidebar-collapsed-width);
}

.shell-topbar {
  position: sticky;
  top: 0;
  min-height: var(--topbar-height);
  background: var(--topbar-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--topbar-border);
  display: flex;
  align-items: center;
  padding: 12px 24px;
  z-index: 30;
  gap: 12px;
}

.shell-content {
  flex: 1;
  padding: 24px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* ===== Sidebar Components ===== */

.sidebar-brand {
  padding: 16px 16px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

body.sidebar-collapsed .sidebar-brand {
  justify-content: center;
  padding-left: 10px;
  padding-right: 10px;
}

.sidebar-brand-mark {
  width: 36px;
  height: 36px;
  border-radius: var(--md-sys-shape-corner-sm);
  background: var(--sidebar-active);
  color: var(--sidebar-active-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.sidebar-brand-text h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--sidebar-text);
  line-height: 1.2;
}

.sidebar-brand-text p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--sidebar-text-muted);
}

body.sidebar-collapsed .sidebar-brand-text,
body.sidebar-collapsed .sidebar-nav-group-label,
body.sidebar-collapsed .sidebar-group-toggle,
body.sidebar-collapsed .sidebar-footer {
  display: none;
}

body.sidebar-collapsed .sidebar-nav-section.is-collapsed {
  display: grid;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.sidebar-nav-group-label {
  padding: 14px 12px 4px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--sidebar-text-muted);
}

.sidebar-group-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
  padding: 10px 12px 6px;
  border: 0;
  background: transparent;
  color: var(--sidebar-text-muted);
  cursor: pointer;
  font: inherit;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
}

.sidebar-group-toggle:hover {
  color: var(--sidebar-text);
}

.sidebar-group-chevron {
  flex-shrink: 0;
  transition: transform 0.16s ease;
}

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

.sidebar-nav-section {
  display: grid;
  gap: 1px;
}

.sidebar-nav-section.is-collapsed {
  display: none;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--md-sys-shape-corner-sm);
  color: var(--sidebar-text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

body.sidebar-collapsed .sidebar-nav {
  overflow: visible;
  padding-left: 10px;
  padding-right: 10px;
}

body.sidebar-collapsed .sidebar-nav a {
  position: relative;
  justify-content: center;
  padding: 10px;
}

body.sidebar-collapsed .sidebar-nav a svg {
  flex-shrink: 0;
}

body.sidebar-collapsed .sidebar-nav a span {
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  z-index: 80;
  width: max-content;
  max-width: 220px;
  padding: 7px 10px;
  color: var(--md-sys-color-on-surface);
  background: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline);
  border-radius: var(--md-sys-shape-corner-sm);
  box-shadow: var(--md-sys-elevation-2);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
  opacity: 0;
  pointer-events: none;
  transform: translate(4px, -50%);
  transition: opacity 0.14s ease, transform 0.14s ease, visibility 0.14s ease;
  visibility: hidden;
}

body.sidebar-collapsed .sidebar-nav a:hover span,
body.sidebar-collapsed .sidebar-nav a:focus-visible span {
  opacity: 1;
  transform: translate(0, -50%);
  visibility: visible;
}

.sidebar-nav a:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-text);
}

.sidebar-nav a.active {
  background: var(--sidebar-hover);
  color: var(--sidebar-active-text);
  font-weight: 600;
}

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--sidebar-border);
  flex-shrink: 0;
  font-size: 11px;
  color: var(--sidebar-text-muted);
}

/* ===== Topbar ===== */

.topbar-hamburger {
  display: none;
  padding: 8px;
  margin: -8px;
  margin-right: 4px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--md-sys-shape-corner-sm);
  color: var(--md-sys-color-on-surface-variant);
  transition: background 0.15s;
}

.topbar-collapse-toggle {
  display: flex;
}

body.sidebar-collapsed .topbar-collapse-toggle svg {
  transform: rotate(180deg);
}

.topbar-hamburger:hover {
  background: var(--md-sys-color-surface-variant);
}

.topbar-inner {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.topbar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--md-sys-color-on-surface);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* ===== Sidebar Overlay (mobile) ===== */

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 35;
}

/* ===== Responsive ===== */

@media (max-width: 1023px) {
  .shell-sidebar {
    transform: translateX(-100%);
  }

  .shell-sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.open {
    display: block;
  }

  .shell-main {
    margin-left: 0;
  }

  body.sidebar-collapsed .shell-sidebar {
    width: var(--sidebar-width);
  }

  body.sidebar-collapsed .shell-main {
    margin-left: 0;
  }

  body.sidebar-collapsed .sidebar-brand {
    justify-content: flex-start;
    padding: 16px 16px 14px;
  }

  body.sidebar-collapsed .sidebar-brand-text,
  body.sidebar-collapsed .sidebar-nav-group-label,
  body.sidebar-collapsed .sidebar-group-toggle,
  body.sidebar-collapsed .sidebar-footer {
    display: block;
  }

  body.sidebar-collapsed .sidebar-group-toggle {
    display: flex;
  }

  body.sidebar-collapsed .sidebar-nav a span {
    display: inline;
    position: static;
    max-width: none;
    padding: 0;
    color: inherit;
    background: transparent;
    border: 0;
    box-shadow: none;
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
    opacity: 1;
    transform: none;
    visibility: visible;
  }

  body.sidebar-collapsed .sidebar-nav a {
    justify-content: flex-start;
    padding: 8px 12px;
  }

  .topbar-hamburger {
    display: flex;
  }

  .topbar-collapse-toggle {
    display: none;
  }
}

@media (max-width: 640px) {
  .shell-content {
    padding: 16px;
  }

  .shell-topbar {
    padding: 12px 16px;
  }
}

/* ===== Grid ===== */

.grid-cards {
  display: grid;
  gap: 16px;
}

.grid-cards-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cards-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cards-2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 1023px) {
  .grid-cards-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-cards-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-cards-4,
  .grid-cards-3,
  .grid-cards-2 { grid-template-columns: 1fr; }
}