:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1a2332;
  --muted: #5c6b7a;
  --primary: #1f6feb;
  --primary-hover: #1558c0;
  --danger: #cf222e;
  --border: #d8dee4;
  --flag: #fff8e6;
  --flag-border: #f0c14b;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(26, 35, 50, 0.08);
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  background: linear-gradient(135deg, #0f3d7a, #1f6feb);
  color: #fff;
  padding: 2rem 0 1.5rem;
}

.site-header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
}

.lead {
  margin: 0;
  opacity: 0.92;
}

.site-nav {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.site-nav a {
  color: #fff;
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
}

.site-nav a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.28);
  font-weight: 600;
}

.layout {
  display: grid;
  gap: 1.5rem;
  padding: 1.5rem 0 3rem;
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.panel--accent {
  border-color: #b6d4fe;
  background: #f6f9ff;
}

.panel h2 {
  margin-top: 0;
}

.muted {
  color: var(--muted);
}

.courses-grid {
  display: grid;
  gap: 1rem;
}

.course-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  background: #fff;
}

.course-card--flagged {
  background: var(--flag);
  border-color: var(--flag-border);
}

.course-card__title {
  margin: 0 0 0.25rem;
}

.course-card__institution {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.course-card__link {
  color: var(--primary);
  font-weight: 600;
}

.course-card__footer {
  margin-top: 1rem;
}

.form {
  display: grid;
  gap: 0.85rem;
}

.form label {
  display: grid;
  gap: 0.35rem;
  font-weight: 600;
}

.form input,
.form textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.form--inline {
  grid-template-columns: 1fr auto;
  align-items: end;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  font: inherit;
  cursor: pointer;
}

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

.btn--primary:hover {
  background: var(--primary-hover);
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--border);
}

.btn--danger {
  background: var(--danger);
  color: #fff;
}

.admin-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.status {
  min-height: 1.25rem;
  font-size: 0.95rem;
}

.status--info {
  color: var(--muted);
}

.status--success {
  color: #1a7f37;
}

.status--error {
  color: var(--danger);
}

.site-footer {
  padding: 1.5rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}