:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --border: #dfe3eb;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #0d6efd;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: var(--bg);
}

a { text-decoration: none; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  transform: translateX(-100%);
  transition: transform 0.2s ease;
  z-index: 1050;
  display: flex;
  flex-direction: column;
}

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

.sidebar-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #eef1f6;
}

.sidebar-nav {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-nav a {
  display: block;
  border-radius: 0.5rem;
  padding: 0.65rem 0.8rem;
  color: #374151;
  font-weight: 500;
}

.sidebar-nav a:hover { background: #eef3ff; color: #111827; }
.sidebar-nav a.active { background: var(--primary); color: #fff; }

.sidebar-footer {
  margin-top: auto;
  border-top: 1px solid #eef1f6;
  padding: 1rem;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  border: 0;
  z-index: 1040;
  display: none;
}

.sidebar-backdrop.show { display: block; }

.main { min-width: 0; display: flex; flex-direction: column; min-height: 100vh; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1680px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
}

.content {
  width: min(1680px, calc(100% - 2rem));
  margin: 1rem auto;
}

.page {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.public-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.public-card {
  width: min(640px, 100%);
}

.mobile-readonly {
  display: none;
}

body.mobile-readonly-active .mobile-readonly {
  display: block;
}

body.mobile-readonly-active .js-edit-action {
  opacity: 0.6;
  pointer-events: none;
}

@media (min-width: 992px) {
  .app-shell {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .sidebar {
    position: sticky;
    top: 0;
    transform: none;
    height: 100vh;
  }

  .sidebar-backdrop { display: none !important; }

  .topbar-inner { padding: 0.95rem 2rem; }

  .content {
    width: min(1680px, calc(100% - 4rem));
    margin: 1.5rem auto;
  }
}

@media (min-width: 1400px) {
  .topbar-inner { padding-left: 2.5rem; padding-right: 2.5rem; }
  .content { width: min(1680px, calc(100% - 5rem)); }
}