:root {
  --navy: #1f4e79;
  --navy-dark: #163a5c;
  --bg: #f4f6f9;
  --line: #e0e4ea;
  --text: #1c2733;
  --muted: #7a8694;
  --danger: #b23b3b;
}

* { box-sizing: border-box; }

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

/* ── Top bar ─────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--navy);
  color: #fff;
  padding: 12px 24px;
}
.topbar .brand { font-weight: 700; font-size: 18px; letter-spacing: .5px; }
.topbar nav { display: flex; gap: 18px; }
.topbar nav a { color: #dce6f2; text-decoration: none; font-weight: 500; }
.topbar nav a:hover { color: #fff; }
.topbar .logout { margin-left: auto; }
.topbar .logout button {
  background: transparent; border: 1px solid #4a6f97; color: #dce6f2;
  padding: 6px 12px; border-radius: 6px; cursor: pointer;
}
.topbar .logout button:hover { background: var(--navy-dark); }

/* ── Layout ──────────────────────────────────────────────── */
.container { max-width: 1000px; margin: 28px auto; padding: 0 20px; }
h1 { font-size: 24px; margin: 0 0 16px; }
h2 { font-size: 18px; margin: 28px 0 12px; }
.page-head { display: flex; align-items: center; justify-content: space-between; }
.muted { color: var(--muted); }

/* ── Cards ───────────────────────────────────────────────── */
.cards { display: flex; gap: 16px; margin-bottom: 12px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 18px 22px; flex: 1;
}
.card-num { font-size: 30px; font-weight: 700; color: var(--navy); }
.card-label { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* ── Tables ──────────────────────────────────────────────── */
.grid {
  width: 100%; border-collapse: collapse; background: #fff;
  border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
}
.grid th {
  background: var(--navy); color: #fff; text-align: left;
  padding: 10px 12px; font-size: 12px; text-transform: uppercase; letter-spacing: .4px;
}
.grid td { padding: 10px 12px; border-top: 1px solid var(--line); font-size: 14px; }
.grid tr.inactive { color: var(--muted); }
.row-actions { display: flex; gap: 6px; white-space: nowrap; }

/* ── Buttons ─────────────────────────────────────────────── */
button {
  font: inherit; border: 1px solid var(--line); background: #fff;
  padding: 6px 12px; border-radius: 6px; cursor: pointer;
}
button:hover { background: #f0f3f7; }
.btn-primary { background: var(--navy); color: #fff; border-color: var(--navy); }
.btn-primary:hover { background: var(--navy-dark); }
/* Anchors styled as buttons (e.g. "New invoice") need the box styling that the
   bare `button` selector doesn't apply to <a>. */
a.btn-primary, a.btn {
  display: inline-block; padding: 8px 14px; border-radius: 6px;
  border: 1px solid var(--navy); font-weight: 600; text-decoration: none;
  line-height: 1.2;
}
a.btn-primary:hover { color: #fff; }
button.danger { color: var(--danger); border-color: #e6c9c9; }
button.danger:hover { background: #fbeeee; }

/* ── Badges ──────────────────────────────────────────────── */
.badge { padding: 2px 8px; border-radius: 10px; font-size: 12px; text-transform: capitalize; }
.badge-scheduled { background: #e3edf9; color: var(--navy); }
.badge-completed { background: #e2f2e6; color: #2c6b3f; }
.badge-cancelled { background: #f2e2e2; color: #8a3b3b; }
.badge-no_show   { background: #f6ecda; color: #8a6d2b; }
.badge-requested { background: #ece3f6; color: #5a3b8a; }

/* ── Sub-page tabs (student hub) ─────────────────────────── */
.tabs { display: flex; gap: 8px; margin: 4px 0 16px; }
.tabs .tab { text-decoration: none; padding: 8px 14px; border-radius: 8px; color: var(--navy);
             border: 1px solid var(--line); font-weight: 600; font-size: 14px; }
.tabs .tab.on { background: var(--navy); color: #fff; border-color: var(--navy); }
.tabs .tab.disabled { color: var(--muted); border-style: dashed; cursor: default; }

/* ── Warning banner ──────────────────────────────────────── */
.warn-banner {
  background: #fff6e6; border: 1px solid #eacb86; color: #7a5a1e;
  border-radius: 8px; padding: 10px 14px; margin: 12px 0; font-size: 14px;
}
.warn-banner div { margin-top: 2px; }

/* ── Forms / modal ───────────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(20,30,45,.45);
  display: none; align-items: flex-start; justify-content: center; z-index: 50;
  padding: 40px 16px; overflow-y: auto;
}
.modal {
  background: #fff; border-radius: 12px; width: 100%; max-width: 520px;
  padding: 22px 24px; box-shadow: 0 12px 40px rgba(0,0,0,.2);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; }
.modal-head h2 { margin: 0; }
.modal-close { border: none; background: none; font-size: 24px; line-height: 1; color: var(--muted); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

label { display: block; font-size: 13px; color: var(--muted); margin-top: 14px; }
label.checkbox { display: flex; align-items: center; gap: 8px; color: var(--text); }
label.checkbox input { width: auto; margin-top: 0; }
input, select, textarea {
  width: 100%; margin-top: 5px; padding: 8px 10px; font: inherit;
  border: 1px solid var(--line); border-radius: 6px; color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: 2px solid #bcd2ec; border-color: var(--navy); }
input[readonly] { background: #f4f6f9; color: var(--muted); }
.form-row { display: flex; gap: 14px; }
.form-row label { flex: 1; }

/* ── Login ───────────────────────────────────────────────── */
.login-body {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; background: var(--navy);
}
.login-card {
  background: #fff; padding: 32px 30px; border-radius: 12px;
  width: 100%; max-width: 340px; box-shadow: 0 12px 40px rgba(0,0,0,.25);
}
.login-card h1 { color: var(--navy); text-align: center; }
.login-card button { width: 100%; margin-top: 20px; }
.login-card .error { color: var(--danger); font-size: 14px; text-align: center; }