/* ============================================================
   IRIBHM Microscopy Platform — Layout Utilities
   ============================================================
   Grids, containers, flex helpers, responsive breakpoints.
   ============================================================ */

/* ── Container ───────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-wide {
  max-width: 1600px;
}

.container-narrow {
  max-width: 900px;
}

/* ── Section Spacing ─────────────────────────────────────── */
.section {
  padding: var(--space-16) 0;
}

.section-sm {
  padding: var(--space-8) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

/* ── Flex Helpers ────────────────────────────────────────── */
.flex             { display: flex; }
.flex-col         { flex-direction: column; }
.flex-wrap        { flex-wrap: wrap; }
.flex-1           { flex: 1; }
.items-center     { align-items: center; }
.items-start      { align-items: flex-start; }
.items-end        { align-items: flex-end; }
.items-stretch    { align-items: stretch; }
.justify-center   { justify-content: center; }
.justify-between  { justify-content: space-between; }
.justify-end      { justify-content: flex-end; }
.gap-1            { gap: var(--space-1); }
.gap-2            { gap: var(--space-2); }
.gap-3            { gap: var(--space-3); }
.gap-4            { gap: var(--space-4); }
.gap-5            { gap: var(--space-5); }
.gap-6            { gap: var(--space-6); }
.gap-8            { gap: var(--space-8); }

/* ── Grid System ─────────────────────────────────────────── */
.grid {
  display: grid;
  gap: var(--space-6);
}

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

/* Auto-fit responsive grid */
.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.grid-auto-sm {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

/* ── Text Alignment ──────────────────────────────────────── */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

/* ── Visibility ──────────────────────────────────────────── */
.hidden     { display: none !important; }
.invisible  { visibility: hidden; }
.opacity-0  { opacity: 0; }

/* ── Overflow ────────────────────────────────────────────── */
.overflow-hidden  { overflow: hidden; }
.overflow-auto    { overflow: auto; }
.overflow-x-auto  { overflow-x: auto; }

/* ── Position ────────────────────────────────────────────── */
.relative  { position: relative; }
.absolute  { position: absolute; }
.fixed     { position: fixed; }
.sticky    { position: sticky; }
.inset-0   { inset: 0; }

/* ── Width / Height ──────────────────────────────────────── */
.w-full  { width: 100%; }
.h-full  { height: 100%; }
.h-screen { height: 100vh; }

/* ── Margin Helpers ──────────────────────────────────────── */
.mx-auto  { margin-left: auto; margin-right: auto; }
.mt-4     { margin-top: var(--space-4); }
.mt-6     { margin-top: var(--space-6); }
.mt-8     { margin-top: var(--space-8); }
.mb-2     { margin-bottom: var(--space-2); }
.mb-4     { margin-bottom: var(--space-4); }
.mb-6     { margin-bottom: var(--space-6); }
.mb-8     { margin-bottom: var(--space-8); }

/* ── App Layout ──────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.app-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: width var(--transition-base);
}

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

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0; /* prevent flex blowout */
}

.app-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
  z-index: var(--z-sticky);
}

.app-content {
  flex: 1;
  overflow-y: auto;
}

.app-toolbar {
  height: var(--toolbar-height);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-4);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1200px) {
  .grid-cols-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .grid-cols-3,
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }

  .app-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: var(--z-overlay);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

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

  .container {
    padding: 0 var(--space-4);
  }
}

@media (max-width: 600px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 { grid-template-columns: 1fr; }

  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-xl); }
  h3 { font-size: var(--text-lg); }
}

/* ── Navigation Bar ──────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  z-index: var(--z-sticky);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: var(--weight-bold);
  font-size: var(--text-md);
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-md);
  font-size: 18px;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.navbar-link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.navbar-link:hover,
.navbar-link.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.navbar-actions .btn-icon {
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.navbar-actions .btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-8) 0;
  margin-top: var(--space-16);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-primary);
}