/* ── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:       #1e4d8c;
  --blue-dark:  #163a6b;
  --blue-light: #e8f0fb;
  --green:      #1a7a40;
  --green-bg:   #e6f4ed;
  --yellow:     #a56200;
  --yellow-bg:  #fff8e6;
  --red:        #b91c1c;
  --red-bg:     #fef2f2;
  --gray-100:   #f5f7fa;
  --gray-200:   #e8ecf0;
  --gray-300:   #d0d7df;
  --gray-600:   #57677b;
  --gray-800:   #2d3748;
  --text:       #1a202c;
  --radius:     8px;
  --shadow:     0 1px 4px rgba(0,0,0,.10), 0 4px 16px rgba(0,0,0,.06);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--gray-100);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ── Layout ──────────────────────────────────────────────────────────────────*/
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

.container.wide { max-width: 1100px; }

/* ── Header ──────────────────────────────────────────────────────────────────*/
header {
  background: var(--blue);
  color: #fff;
  padding: 24px 0 20px;
  margin-bottom: 32px;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

header .inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px;
}

header.wide .inner { max-width: 1100px; }

header h1 { font-size: 1.4rem; font-weight: 700; letter-spacing: .02em; }
header h2 { font-size: 1rem; font-weight: 400; opacity: .85; margin-top: 2px; }

.student-badge {
  display: inline-block;
  background: rgba(255,255,255,.18);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: .85rem;
  margin-top: 8px;
}

/* ── Cards ───────────────────────────────────────────────────────────────────*/
.card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 32px;
  margin-bottom: 24px;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--blue-light);
}

/* ── Forms ───────────────────────────────────────────────────────────────────*/
.form-group {
  margin-bottom: 18px;
}

label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 6px;
}

label .req { color: var(--red); margin-left: 2px; }

input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--gray-300);
  border-radius: 6px;
  font-size: .95rem;
  color: var(--text);
  background: #fff;
  transition: border-color .15s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,77,140,.12);
}

select:disabled, input:disabled {
  background: var(--gray-100);
  color: var(--gray-600);
  cursor: not-allowed;
}

/* ── Buttons ─────────────────────────────────────────────────────────────────*/
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  border: none;
  border-radius: 6px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, opacity .15s;
}

.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary  { background: var(--blue);  color: #fff; }
.btn-primary:hover:not(:disabled)  { background: var(--blue-dark); }
.btn-success  { background: var(--green); color: #fff; }
.btn-success:hover:not(:disabled)  { background: #145e30; }
.btn-danger   { background: var(--red);   color: #fff; }
.btn-danger:hover:not(:disabled)   { background: #991b1b; }
.btn-secondary{ background: var(--gray-200); color: var(--gray-800); }
.btn-secondary:hover:not(:disabled){ background: var(--gray-300); }
.btn-sm { padding: 5px 12px; font-size: .8rem; }
.btn-full { width: 100%; justify-content: center; }

/* ── Alerts ──────────────────────────────────────────────────────────────────*/
.alert {
  padding: 12px 16px;
  border-radius: 6px;
  font-size: .9rem;
  margin-bottom: 16px;
}
.alert-error   { background: var(--red-bg);    color: var(--red);    border-left: 4px solid var(--red); }
.alert-success { background: var(--green-bg);  color: var(--green);  border-left: 4px solid var(--green); }
.alert-warn    { background: var(--yellow-bg); color: var(--yellow); border-left: 4px solid var(--yellow); }
.hidden { display: none !important; }

/* ── Survey specific ─────────────────────────────────────────────────────────*/
.section-intro {
  font-size: .9rem;
  color: var(--gray-600);
  margin-bottom: 20px;
}

.elective-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 560px) { .elective-grid { grid-template-columns: 1fr; } }

.course-full-badge {
  display: inline-block;
  background: var(--red-bg);
  color: var(--red);
  font-size: .75rem;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 10px;
  margin-left: 6px;
  vertical-align: middle;
}

.submit-section {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ── Confirmation ────────────────────────────────────────────────────────────*/
.success-icon {
  width: 64px;
  height: 64px;
  background: var(--green);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 20px;
}

.confirmation-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: .9rem;
}

.confirmation-table th,
.confirmation-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.confirmation-table th {
  background: var(--blue-light);
  color: var(--blue);
  font-weight: 700;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.confirmation-table tr:last-child td { border-bottom: none; }

.note {
  font-size: .82rem;
  color: var(--gray-600);
  margin-top: 16px;
  text-align: center;
}

/* ── Loading spinner ─────────────────────────────────────────────────────────*/
.loading {
  text-align: center;
  color: var(--gray-600);
  padding: 40px;
  font-size: 1rem;
}

/* ── Admin tables ────────────────────────────────────────────────────────────*/
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .875rem;
}

.data-table th {
  background: var(--blue);
  color: #fff;
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  white-space: nowrap;
}

.data-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--gray-200);
  vertical-align: middle;
}

.data-table tr:hover td { background: var(--blue-light); }
.data-table .actions-cell { white-space: nowrap; }

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ── Admin tabs ──────────────────────────────────────────────────────────────*/
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: 24px;
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-size: .9rem;
  font-weight: 600;
  color: var(--gray-600);
  cursor: pointer;
  white-space: nowrap;
  transition: color .15s, border-color .15s;
}

.tab-btn.active, .tab-btn:hover { color: var(--blue); }
.tab-btn.active { border-bottom-color: var(--blue); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Admin toolbar ───────────────────────────────────────────────────────────*/
.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.toolbar-right { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Enrollment bars ─────────────────────────────────────────────────────────*/
.enrollment-bar-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 160px;
}

.enrollment-bar {
  flex: 1;
  height: 10px;
  background: var(--gray-200);
  border-radius: 5px;
  overflow: hidden;
}

.enrollment-bar-fill {
  height: 100%;
  border-radius: 5px;
  transition: width .3s;
}

.fill-green  { background: #22c55e; }
.fill-yellow { background: #f59e0b; }
.fill-red    { background: #ef4444; }

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: .75rem;
  font-weight: 700;
}
.badge-green  { background: var(--green-bg);  color: var(--green); }
.badge-yellow { background: var(--yellow-bg); color: var(--yellow); }
.badge-red    { background: var(--red-bg);    color: var(--red); }
.badge-gray   { background: var(--gray-200);  color: var(--gray-600); }

.stat-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.stat-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  flex: 1;
  min-width: 140px;
}

.stat-card .stat-value { font-size: 2rem; font-weight: 800; color: var(--blue); }
.stat-card .stat-label { font-size: .8rem; color: var(--gray-600); margin-top: 2px; }

/* ── Modal ───────────────────────────────────────────────────────────────────*/
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-overlay.open { display: flex; }

.modal {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0,0,0,.2);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px 14px;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 { font-size: 1rem; font-weight: 700; }

.modal-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--gray-600);
  line-height: 1;
  padding: 2px 6px;
}

.modal-body { padding: 20px 24px; }

.modal-footer {
  padding: 14px 24px 18px;
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ── Admin login ─────────────────────────────────────────────────────────────*/
.login-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--gray-100);
  padding: 24px;
}

.login-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 40px;
  width: 100%;
  max-width: 380px;
}

.login-card h1 { font-size: 1.2rem; font-weight: 800; color: var(--blue); margin-bottom: 4px; }
.login-card p  { font-size: .875rem; color: var(--gray-600); margin-bottom: 24px; }

/* ── Responsive ──────────────────────────────────────────────────────────────*/
@media (max-width: 640px) {
  .card { padding: 20px 16px; }
  header .inner { padding: 0 12px; }
  .modal { max-width: 100%; }
}