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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

ul, ol {
  list-style: none;
}

/* ============================================================
   VARIABLES CSS
   ============================================================ */
:root {
  --color-primary:      #6366f1;
  --color-primary-dim:  #4f46e5;
  --color-success:      #10b981;
  --color-danger:       #ef4444;
  --color-warning:      #f59e0b;

  --color-bg:           #0f1117;
  --color-surface:      #1a1d27;
  --color-surface-2:    #222635;
  --color-border:       #2a2f42;
  --color-border-light: #353a52;

  --color-text:         #e2e8f0;
  --color-text-muted:   #8892a4;
  --color-text-dim:     #64748b;

  --sidebar-width:      240px;
  --border-radius:      8px;
  --border-radius-lg:   12px;
  --shadow:             0 4px 24px rgba(0, 0, 0, 0.4);
  --transition:         0.18s ease;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.layout {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 100;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sidebar-logo-text {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.2;
}

.sidebar-nav {
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--border-radius);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}

.nav-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-link:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.nav-link.active {
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-primary);
}

.nav-link.active svg {
  opacity: 1;
}

/* --- Main content --- */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  overflow-y: auto;
}

#app {
  padding: 28px 32px;
  max-width: 1200px;
}

/* ============================================================
   TIPOGRAFIA
   ============================================================ */
h1 { font-size: 1.5rem;  font-weight: 700; line-height: 1.3; }
h2 { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }
h3 { font-size: 1.0625rem; font-weight: 600; }
h4 { font-size: 0.9375rem; font-weight: 600; }

/* ============================================================
   LOADING STATE
   ============================================================ */
.loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-dim); }