:root {
  --bg: #f6f8ff;
  --bg-grad: linear-gradient(120deg, #eef2ff, #ffffff);
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #4f46e5;      /* indigo-600 */
  --primary-2: #3b82f6;    /* blue-500 */
  --ring: rgba(79,70,229,.35);
  --shadow: 0 10px 30px rgba(36, 60, 120, 0.12);
  --shadow-soft: 0 6px 20px rgba(0,0,0,0.08);
  --radius: 16px;
}

html[data-theme="dark"] {
  --bg: #0f172a;
  --bg-grad: radial-gradient(1200px 600px at 20% -10%, #1f2937, #0f172a 60%);
  --surface: #121a2b;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #60a5fa;
  --primary-2: #a78bfa;
  --ring: rgba(96,165,250,.35);
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --shadow-soft: 0 6px 20px rgba(0,0,0,0.25);
}

* { box-sizing: border-box; }
body {
  background: var(--bg-grad);
  color: var(--text);
}

.app-navbar {
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

.navbar .nav-link {
  color: var(--text);
  opacity: .9;
  transition: color .2s ease, opacity .2s ease, transform .2s ease;
  border-radius: 10px;
  padding: .5rem .75rem;
}
.navbar .nav-link:hover { color: var(--primary); opacity: 1; transform: translateY(-1px); }

.custom-toggler { border: none; color: var(--text); background: transparent; }

.brand-logo {
  display:inline-grid; place-items:center; width:34px; height:34px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color:#fff; border-radius:10px; font-weight:700;
  box-shadow: 0 6px 18px rgba(79,70,229,0.35);
}
.brand-text { font-weight: 700; letter-spacing: .2px; color: var(--text); }

.app-hero { padding-top: 16px; }

.app-main { padding: 24px 0; }

.content-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.content-card:hover { transform: translateY(-4px); box-shadow: 0 14px 40px rgba(0,0,0,0.12); }

.app-alert {
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(0,0,0,0.05);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border: none;
  box-shadow: 0 6px 18px rgba(59,130,246,.35);
}
.btn-primary:hover { filter: brightness(.95); }

.btn-outline-primary {
  border-color: var(--primary);
  color: var(--primary);
}
.btn-outline-primary:hover {
  background: var(--primary);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(0,0,0,.08);
  color: var(--text);
}
.btn-ghost:hover {
  background: rgba(0,0,0,.04);
}

.form-control, .form-select {
  background: var(--surface);
  color: var(--text);
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,.08);
  box-shadow: none;
  transition: box-shadow .2s ease, border-color .2s ease;
}
.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--ring);
}

.table {
  color: var(--text);
  border-color: rgba(0,0,0,.1);
}
.table thead { background: rgba(0,0,0,.03); }

.app-footer {
  padding: 24px 0 40px;
  color: var(--muted);
}

.img-fluid { border-radius: 12px; box-shadow: var(--shadow-soft); }