:root {
  --bg-primary: #0f172a;
  --bg-surface: #1e293b;
  --bg-sidebar: #0f172a;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-blue: #38bdf8;
  --accent-blue-hover: #0284c7;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --bg-sidebar: #f1f5f9;
    --border-color: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent-blue: #0284c7;
    --accent-blue-hover: #0369a1;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  display: flex;
  min-height: 100vh;
}

/* Layout */
.app-container { display: flex; width: 100vw; min-height: 100vh; }
.sidebar {
  width: 260px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}
.sidebar-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.sidebar-nav { list-style: none; display: flex; flex-direction: column; gap: 0.35rem; flex: 1; }
.sidebar-nav a {
  display: flex;
  align-items: center;
  padding: 0.6rem 0.85rem;
  border-radius: 0.5rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.925rem;
  font-weight: 500;
  transition: all 0.15s ease;
}
.sidebar-nav a:hover, .sidebar-nav a.active {
  background-color: var(--bg-surface);
  color: var(--text-main);
}
.main-wrapper { flex: 1; display: flex; flex-direction: column; overflow-y: auto; }
.header {
  height: 64px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}
.header-left { display: flex; align-items: center; gap: 1rem; }
.header-right { display: flex; align-items: center; gap: 1.25rem; }
.content { padding: 2rem; max-width: 1300px; width: 100%; margin: 0 auto; }

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge-success { background-color: rgba(16, 185, 129, 0.15); color: var(--color-success); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-warning { background-color: rgba(245, 158, 11, 0.15); color: var(--color-warning); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-danger { background-color: rgba(239, 68, 68, 0.15); color: var(--color-danger); border: 1px solid rgba(239, 68, 68, 0.3); }
.badge-neutral { background-color: rgba(148, 163, 184, 0.15); color: var(--text-muted); border: 1px solid var(--border-color); }

/* Flash Banners */
.flash-banner {
  padding: 0.85rem 1.25rem;
  border-radius: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.flash-success { background-color: rgba(16, 185, 129, 0.15); border: 1px solid var(--color-success); color: var(--color-success); }
.flash-error { background-color: rgba(239, 68, 68, 0.15); border: 1px solid var(--color-danger); color: var(--color-danger); }

/* Cards & Grid */
.grid { display: grid; gap: 1.5rem; }
.grid-cols-3 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(auto-fit, minmax(450px, 1fr)); }
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.5rem;
}
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.card-title { font-size: 1.1rem; font-weight: 600; }

/* Tables */
.table-container { overflow-x: auto; background-color: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 0.75rem; }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.9rem; }
th { background-color: rgba(255, 255, 255, 0.02); color: var(--text-muted); padding: 0.85rem 1.25rem; font-weight: 600; border-bottom: 1px solid var(--border-color); }
td { padding: 0.85rem 1.25rem; border-bottom: 1px solid var(--border-color); }
tr:last-child td { border-bottom: none; }
tr:hover td { background-color: rgba(255, 255, 255, 0.02); }

/* Forms & Buttons */
.form-group { margin-bottom: 1.25rem; }
label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--text-muted); margin-bottom: 0.4rem; }
input[type="text"], input[type="password"], input[type="number"], select, textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.925rem;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent-blue); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background-color 0.15s ease;
}
.btn-primary { background-color: var(--accent-blue); color: #0f172a; }
.btn-primary:hover { background-color: var(--accent-blue-hover); }
.btn-secondary { background-color: rgba(255, 255, 255, 0.08); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: rgba(255, 255, 255, 0.12); }
.btn-danger { background-color: var(--color-danger); color: white; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }

/* SVG Sparkline */
.sparkline { width: 100%; height: 60px; stroke: var(--accent-blue); stroke-width: 2; fill: none; }
.code-inline { font-family: var(--font-mono); font-size: 0.85rem; background-color: rgba(255, 255, 255, 0.06); padding: 0.15rem 0.4rem; border-radius: 0.25rem; }

/* Auth Centered Box */
.auth-box {
  max-width: 420px;
  margin: 6rem auto;
  padding: 2.5rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
}