:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #0ea5e9;
  --accent-hover: #0284c7;
  --danger: #ef4444;
  --success: #10b981;
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
}

.hidden { display: none !important; }

/* LAYOUT */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.top-nav {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.badge-primary {
  background: rgba(14, 165, 233, 0.1);
  color: var(--accent);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 15px;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 6px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-btn:hover { background: rgba(0,0,0,0.05); color: var(--text); }
.nav-btn.active { color: var(--accent); background: rgba(14, 165, 233, 0.1); }

.main-content {
  padding: 40px 20px;
}

.view-header {
  margin-bottom: 30px;
}
.view-header h2 { margin: 0 0 5px 0; font-size: 1.8rem; }
.text-muted { color: var(--text-muted); margin: 0; }

/* LOGIN SCREEN */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg);
}
.login-box {
  background: var(--surface);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
  width: 100%;
  max-width: 400px;
  border: 1px solid var(--border);
}

/* FORMS & BUTTONS */
.form-group { margin-bottom: 15px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}
.input-modern {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  box-sizing: border-box;
  transition: all 0.2s;
}
.input-modern:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(14,165,233,0.15);
  background: var(--surface);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost {
  background: none;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-ghost:hover { background: #f1f5f9; color: var(--text); }

/* GRID CATALOG */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.02);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px rgba(0,0,0,0.05);
}

/* TABLES */
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th, .data-table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  background: #f8fafc;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* MODAL */
.modal {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
.modal-content {
  background: var(--surface);
  width: 100%; max-width: 600px;
  border-radius: 16px;
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
  animation: modalIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  max-height: 90vh;
  display: flex; flex-direction: column;
}
@keyframes modalIn { from { opacity: 0; transform: translateY(20px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }
.modal-header { padding: 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { margin: 0; font-size: 1.2rem; }
.close-modal { background: none; border: none; font-size: 1.5rem; color: var(--text-muted); cursor: pointer; }
.modal-body { padding: 20px; overflow-y: auto; }
.modal-footer { padding: 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

/* TOAST */
.toast {
  position: fixed; bottom: 20px; right: 20px;
  background: #1e293b; color: #fff; padding: 12px 20px;
  border-radius: 8px; box-shadow: 0 10px 15px rgba(0,0,0,0.1);
  z-index: 9999; font-size: 0.95rem; font-weight: 500;
  animation: slideUp 0.3s ease;
}
@keyframes slideUp { from { transform: translateY(100px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }