/* ===== Reset ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  font-size: var(--text-base);
  line-height: var(--lh-base); /* 24px = 3u, anchors baseline grid */
  min-height: 100vh;
}

/* ===== Icons ===== */
.icon {
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  stroke-width: 2;
  flex-shrink: 0;
}

.icon-sm { width: 1rem; height: 1rem; }
.icon-lg { width: 1.5rem; height: 1.5rem; }
.icon-xl { width: 2rem; height: 2rem; }

/* ===== Layout ===== */
.container {
  width: 100%;                      /* Full width */
  margin: 0;
  padding: 0;
  display: grid;                    /* 3 Spalten: Subsystem-Panel | Content | Sidebar */
  grid-template-columns: 260px minmax(0, 1fr) 80px;
  gap: 0;                           /* Kein gap - Borders trennen visuell */
  min-height: 100vh;                /* Full viewport height */
}

/* Wrapper for main content column (Mittelspalte) */
.main-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding: var(--space-6);          /* Padding hier statt am Container */
  min-width: 0;                     /* Erlaubt Schrumpfen im Grid */
  width: 100%;
}

/* Tablet: schmaleres Panel + Sidebar */
@media (max-width: 1023px) {
  .container {
    grid-template-columns: 220px minmax(0, 1fr) 72px;
  }
}

/* Mobile: Spalten stapeln (Panel oben, Content, Sidebar als Bar) */
@media (max-width: 640px) {
  .container {
    grid-template-columns: 1fr;
  }

  .main-content {
    padding: var(--space-4);
    max-width: 100%;
  }
}