/* App Shell Layout */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--tss-color-fifth);
}
.login-card {
  background: var(--tss-color-third);
  border-radius: var(--radius-m);
  padding: var(--sp-11);
  text-align: center;
  min-width: 340px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.login-card h1 { margin-bottom: var(--sp-3); }
.login-card p { color: var(--tss-color-white-060); margin-bottom: var(--sp-8); font-size: var(--tss-font-s); }

#app-shell {
  display: none;
  height: 100vh;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: 1fr;
}
#app-shell.active { display: grid; }

/* Sidebar */
.sidebar {
  background: var(--tss-color-primary-pressed);
  display: flex;
  flex-direction: column;
  box-shadow: 4px 2px 8px rgba(0,0,0,0.25);
  z-index: 10;
  overflow: hidden;
  transition: width 0.2s;
}
.sidebar-brand {
  height: 60px;
  display: flex;
  align-items: center;
  padding: 0 var(--sp-6);
  gap: var(--sp-3);
  border-bottom: 1px solid var(--tss-color-primary-border);
  flex-shrink: 0;
}
.sidebar-brand .brand-icon {
  width: 32px;
  height: 32px;
  background: var(--tss-color-secondary);
  border-radius: var(--radius-s);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--tss-font-l);
  flex-shrink: 0;
}
.sidebar-brand .brand-text {
  font-size: var(--tss-font-m);
  font-weight: 600;
  white-space: nowrap;
}

.sidebar-nav {
  flex: 1;
  padding: var(--sp-3) 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.sidebar-link {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 var(--sp-6);
  gap: var(--sp-3);
  color: var(--tss-color-white-060);
  font-size: var(--tss-font-s);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.sidebar-link:hover {
  background: var(--tss-color-primary-main);
  color: var(--tss-color-white);
  text-decoration: none;
}
.sidebar-link.active {
  background: var(--tss-color-primary-main);
  color: var(--tss-color-white);
}
.sidebar-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.7;
}
.sidebar-link.active svg,
.sidebar-link:hover svg { opacity: 1; }

/* Main Area */
.main-area {
  display: flex;
  flex-direction: column;
  background: var(--tss-color-forth);
  padding: var(--sp-8) var(--sp-8) 0;
  overflow: hidden;
}

/* Page Header */
.page-header-bar {
  background: var(--tss-color-white-015);
  border-radius: var(--radius-m) var(--radius-m) 0 0;
  padding: 0 var(--sp-8);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.page-header-bar .header-left {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.page-header-bar .header-title {
  font-size: var(--tss-font-m);
  font-weight: 600;
}
.page-header-bar .header-right {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
}
.header-divider {
  width: 1px;
  height: 28px;
  background: var(--tss-color-white-025);
}
.header-user {
  font-size: var(--tss-font-s);
  color: var(--tss-color-white-080);
}
.header-org-select {
  background: var(--tss-color-white-006);
  border: 1px solid var(--tss-color-white-025);
  border-radius: var(--radius-xs);
  color: var(--tss-color-white);
  font-size: var(--tss-font-s);
  padding: var(--sp-2) var(--sp-3);
  outline: none;
}
.header-org-select option { background: var(--tss-color-third); }

/* Content Area */
#main-content {
  flex: 1;
  overflow-y: auto;
  background: var(--tss-color-third);
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  padding: var(--sp-8);
}