:root {
  --primary: #1b4332;       /* deep forest green */
  --primary-dark: #0f2a1e;
  --primary-light: #2d6a4f;
  --accent: #40916c;        /* lush mid-green */
  --accent-light: #95d5b2;  /* pale leafy green highlight */
  --bg: #f3faf6;            /* soft green-tinted white */
  --card-bg: #ffffff;
  --text: #16241d;
  --text-muted: #5c7268;
  --border: #d8ece0;
  --success: #2d6a4f;
  --danger: #c0392b;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a { color: var(--primary-light); text-decoration: none; }
a:hover { text-decoration: underline; }

.navbar {
  background: var(--primary);
  color: #fff;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.navbar .brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.navbar .brand:hover { text-decoration: none; }
.navbar .brand i { color: var(--accent-light); }
.navbar .brand span { color: var(--accent-light); }
.navbar .brand .brand-sub {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #dce4f0;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 4px;
  padding: 1px 5px;
  margin-left: 2px;
}
.navbar nav { display: flex; gap: 18px; align-items: center; }
.navbar nav a { color: #dce4f0; font-weight: 500; display: inline-flex; align-items: center; gap: 6px; }
.navbar nav a:hover { color: var(--accent-light); text-decoration: none; }
.navbar .user-pill {
  background: var(--primary-light);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.badge-admin { display: inline-flex; align-items: center; gap: 4px; }

.container { max-width: 1100px; margin: 0 auto; padding: 28px 20px; }
.container-narrow { max-width: 480px; margin: 60px auto; padding: 0 20px; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 1px 3px rgba(11, 37, 69, 0.06);
}

h1, h2, h3 { color: var(--primary); font-weight: 700; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.25rem; }

.btn {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 6px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.92rem;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-light); text-decoration: none; }
.btn-gold { background: var(--accent); color: #ffffff; }
.btn-gold:hover { background: var(--primary-light); text-decoration: none; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-sm { padding: 5px 12px; font-size: 0.82rem; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
th { color: var(--text-muted); font-weight: 600; text-transform: uppercase; font-size: 0.75rem; letter-spacing: 0.04em; }
tr:hover td { background: #fafbfd; }

.form-group { margin-bottom: 16px; }
label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.88rem; color: var(--primary); }
input[type=text], input[type=password], input[type=email], input[type=file], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; }

.folder-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; margin-top: 16px; }
.folder-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.folder-card .icon { font-size: 1.6rem; color: var(--accent); }
.folder-card a.folder-name { color: var(--primary); font-weight: 700; font-size: 1.02rem; }
.folder-card .meta { color: var(--text-muted); font-size: 0.8rem; }

.flash { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 0.9rem; }
.flash-success { background: #e6f6ec; color: var(--success); border: 1px solid #bfe6cc; }
.flash-error { background: #fbe9e7; color: var(--danger); border: 1px solid #f2c6c0; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tabs a { padding: 10px 16px; color: var(--text-muted); font-weight: 600; border-bottom: 2px solid transparent; }
.tabs a.active { color: var(--primary); border-bottom-color: var(--accent); }

.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 0.72rem; font-weight: 700; }
.badge-admin { background: var(--accent); color: #ffffff; }
.badge-course { background: var(--accent-light); color: var(--primary-dark); margin-right: 4px; }

.helptext { color: var(--text-muted); font-size: 0.82rem; margin-top: 4px; }

th.sortable-col { cursor: pointer; user-select: none; white-space: nowrap; }
th.sortable-col:hover { color: var(--primary); }
th.sortable-col .sort-indicator { display: inline-block; width: 10px; font-size: 0.7rem; }

.manage-columns-list { display: flex; flex-direction: column; gap: 10px; }
.manage-columns-list .col-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; flex-wrap: wrap; }
.manage-columns-list .col-row input[type=text] { width: auto; flex: 1; min-width: 160px; }
.placeholder-chip { display: inline-block; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 2px 8px; font-size: 0.8rem; font-family: monospace; margin: 2px 4px 2px 0; cursor: pointer; }
.placeholder-chip:hover { border-color: var(--accent); text-decoration: none; }
.mass-update-bar { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.mass-update-bar .form-group { margin-bottom: 0; }

footer { text-align: center; padding: 24px; color: var(--text-muted); font-size: 0.82rem; }

@media (max-width: 640px) {
  .navbar { flex-direction: column; height: auto; padding: 12px; gap: 8px; }
  .navbar nav { flex-wrap: wrap; justify-content: center; }
  .container { padding: 16px 12px; }
}