:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --bg-color: #0f172a;
  --surface-color: rgba(30, 41, 59, 0.7);
  --text-color: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: rgba(255, 255, 255, 0.1);
  --glass-blur: 12px;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-color);
  background-image: radial-gradient(circle at top right, rgba(79, 70, 229, 0.15), transparent 40%),
                    radial-gradient(circle at bottom left, rgba(56, 189, 248, 0.15), transparent 40%);
  color: var(--text-color);
  min-height: 100vh;
}

* { box-sizing: border-box; }

/* Utilities */
.text-muted { color: var(--text-muted); }
.small-text { font-size: 0.875rem; }
.brand-text { color: var(--primary); margin-top: 0; }
.full-width { width: 100%; }

/* Layouts */
.layout-center {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}
.layout {
  display: flex;
  min-height: 100vh;
}
.grid { display: grid; gap: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Components */
.glass-panel {
  background: var(--surface-color);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.auth-box { padding: 40px; width: 100%; max-width: 400px; text-align: center; }
.form-box { padding: 32px; max-width: 600px; }

.label {
  display: block; margin-bottom: 6px; font-size: 0.875rem; font-weight: 500; color: var(--text-muted); text-align: left;
}

.input {
  width: 100%; padding: 12px; border-radius: 8px; border: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.6); color: var(--text-color); margin-bottom: 16px; font-family: inherit;
  transition: border-color 0.2s;
}
.input:focus { outline: none; border-color: var(--primary); }

.btn {
  background: var(--primary); color: white; border: none; padding: 10px 20px; border-radius: 8px;
  font-weight: 600; cursor: pointer; transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}
.btn:hover {
  background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* Sidebar */
.sidebar {
  width: 260px; margin: 24px 0 24px 24px; padding: 24px; display: flex; flex-direction: column; gap: 16px;
}
.nav-menu { display: flex; flex-direction: column; gap: 8px; flex: 1; }
.nav-item {
  padding: 12px 16px; border-radius: 8px; color: var(--text-muted); font-weight: 500;
  text-decoration: none; transition: background 0.2s, color 0.2s; cursor: pointer; border: none; background: transparent; text-align: left;
}
.nav-item:hover, .nav-item.active { background: rgba(255, 255, 255, 0.05); color: var(--text-color); }
.logout-btn { width: 100%; }

/* Main Content */
.main-content { flex: 1; padding: 40px; overflow-y: auto; }
.view { display: none; }
.view.active-view { display: block; }
.view-title { margin-top: 0; margin-bottom: 8px; }