:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --border: #e2e4e9;
  --text: #1c1f26;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --error: #dc2626;
  --radius: 10px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.muted { color: var(--muted); font-size: 13px; }
.error-text { color: var(--error); font-size: 13px; }

.btn {
  border: none;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }

/* Login */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card .sub { margin: 0 0 20px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; margin-bottom: 4px; color: var(--muted); }
.field input {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}
.login-card .btn { width: 100%; margin-top: 6px; }

/* App shell */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
}
.side-brand { padding: 8px 8px 16px; }
.brand-word { font-weight: 700; font-size: 15px; }
.side-nav { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.side-link {
  display: block;
  padding: 9px 10px;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}
.side-link:hover { background: var(--bg); }
.side-link.active { background: var(--accent); color: #fff; }
.side-user { display: flex; align-items: center; justify-content: space-between; padding: 10px 8px 0; border-top: 1px solid var(--border); margin-top: 10px; }
.iconbtn { background: none; border: none; cursor: pointer; font-size: 13px; color: var(--muted); }
.iconbtn:hover { color: var(--text); }

.topbar { display: none; align-items: center; gap: 12px; padding: 12px 16px; background: var(--panel); border-bottom: 1px solid var(--border); }
.main { flex: 1; min-width: 0; }

@media (max-width: 860px) {
  .sidebar { position: fixed; left: -240px; top: 0; bottom: 0; z-index: 20; transition: left 0.2s; }
  .sidebar.open { left: 0; }
  .topbar { display: flex; }
}

/* Dashboard */
.container { max-width: 960px; margin: 0 auto; padding: 24px; }
.page-title { font-size: 20px; margin: 0 0 18px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card h3 { margin: 0 0 14px; font-size: 15px; }
.stat-row { display: flex; gap: 20px; flex-wrap: wrap; }
.stat-tile { min-width: 140px; }
.stat-value { font-size: 24px; font-weight: 700; }
.stat-label { font-size: 12px; color: var(--muted); margin-top: 2px; }