/* =========
   Minimal Default UI
   ========= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: #f6f7f9;
  color: #111827;
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

/* Layout */
.container {
  max-width: 960px;
  padding: 16px;
  margin: 0 auto;
}

/* Navigation */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  padding: 12px 16px;
  margin-bottom: 24px;
}

.brand {
  font-weight: 700;
}

.nav a {
  color: #111827;
  text-decoration: none;
  margin-left: 12px;
  font-weight: 500;
}

.nav a:hover {
  text-decoration: underline;
}

/* Cards */
.card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  padding: 16px;
  margin-bottom: 16px;
}

/* Headings */
h1, h2, h3 {
  margin-top: 0;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid #d1d5db;
  background: #ffffff;
  color: #111827;
  cursor: pointer;
  font-weight: 500;
}

.btn.primary {
  background: #111827;
  color: #ffffff;
  border-color: #111827;
}

.btn:hover {
  opacity: 0.9;
}

/* Forms */
label {
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
}

input, select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #d1d5db;
  margin-bottom: 12px;
  font-size: 14px;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  background: #ffffff;
}

th, td {
  border: 1px solid #e5e7eb;
  padding: 8px 10px;
  text-align: left;
}

th {
  background: #f9fafb;
}

/* Messages */
.flash {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  padding: 12px;
  margin-bottom: 16px;
}

.flash.ok {
  border-color: #86efac;
  background: #ecfdf5;
}

.flash.err {
  border-color: #fca5a5;
  background: #fef2f2;
}

/* Mobile tweaks */
@media (max-width: 640px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}