/* Student Manager */
.students-admin-shell {
  width: min(1120px, calc(100% - 28px));
  margin: 120px auto 70px;
  color: var(--ink);
}

.students-admin-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: center;
  padding: clamp(28px, 5vw, 56px);
  border-radius: 32px;
  color: white;
  background: linear-gradient(135deg, #08718b, #12b2dd);
  box-shadow: 0 24px 70px rgba(0, 122, 167, 0.22);
  margin-bottom: 24px;
}

.students-admin-hero h1 {
  font-size: clamp(44px, 8vw, 78px);
  line-height: .92;
  margin: 8px 0 18px;
  letter-spacing: -0.06em;
}

.students-admin-hero p {
  max-width: 720px;
  margin: 0;
  color: rgba(255,255,255,.88);
  font-weight: 750;
  line-height: 1.7;
}

.students-admin-hero .eyebrow,
.student-form-card .eyebrow,
.student-result-card .eyebrow,
.students-list-card .eyebrow {
  color: inherit;
  opacity: .92;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-weight: 1000;
  font-size: 12px;
  margin: 0 0 6px;
}

.students-admin-hero-card {
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 26px;
  background: rgba(255,255,255,.12);
  padding: 24px;
  display: grid;
  gap: 12px;
  backdrop-filter: blur(14px);
}

.students-admin-hero-card span {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,.16);
  border-radius: 18px;
  font-size: 28px;
}

.students-admin-hero-card strong {
  font-size: 22px;
}

.students-admin-hero-card small {
  color: rgba(255,255,255,.82);
  line-height: 1.6;
  font-weight: 800;
}

.access-denied-card,
.student-form-card,
.student-result-card,
.students-list-card {
  border: 1px solid rgba(8, 169, 217, .26);
  border-radius: 28px;
  background: rgba(255,255,255,.82);
  box-shadow: 0 18px 52px rgba(0, 122, 167, .14);
  padding: 24px;
  backdrop-filter: blur(18px);
}

.access-denied-card h2,
.student-form-card h2,
.student-result-card h2,
.students-list-card h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 40px);
  letter-spacing: -0.05em;
}

.access-denied-card p,
.student-form-card p,
.student-result-card p,
.students-list-card p,
.helper-text {
  color: var(--muted);
  line-height: 1.6;
  font-weight: 750;
}

.students-admin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, .75fr);
  gap: 24px;
  align-items: start;
  margin-bottom: 24px;
}

.section-heading-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: max-content;
  padding: 9px 13px;
  border-radius: 999px;
  color: #007aa7;
  background: #e6f9ff;
  border: 1px solid rgba(8, 169, 217, .24);
  font-size: 12px;
  font-weight: 1000;
}

.form-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 14px;
}

.form-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.student-form-card label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 950;
  font-size: 13px;
}

.student-form-card label b {
  color: #d62828;
}

.student-form-card input,
.student-form-card select,
.student-form-card textarea,
.filter-row input,
.filter-row select {
  width: 100%;
  border: 1px solid rgba(8, 169, 217, .35);
  border-radius: 16px;
  background: rgba(255,255,255,.86);
  color: var(--ink);
  padding: 14px 15px;
  font: inherit;
  font-weight: 800;
  outline: none;
}

.student-form-card textarea {
  resize: vertical;
}

.student-form-card input:focus,
.student-form-card select:focus,
.student-form-card textarea:focus,
.filter-row input:focus,
.filter-row select:focus {
  border-color: #08a9d9;
  box-shadow: 0 0 0 4px rgba(8, 169, 217, .12);
}

.check-row {
  display: flex !important;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px !important;
  margin: 8px 0 16px;
}

.check-row input {
  width: 18px;
  height: 18px;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

.primary-btn,
.ghost-btn,
.copy-code-btn {
  border: 0;
  border-radius: 999px;
  padding: 13px 20px;
  cursor: pointer;
  font-weight: 1000;
  font: inherit;
}

.primary-btn {
  color: white;
  background: linear-gradient(135deg, #08a9d9, #007aa7);
  box-shadow: 0 12px 24px rgba(8, 169, 217, .22);
}

.ghost-btn,
.copy-code-btn {
  color: #4a2494;
  background: rgba(235, 246, 255, .9);
  border: 1px solid rgba(8, 169, 217, .24);
}

.primary-btn:disabled,
.ghost-btn:disabled {
  opacity: .58;
  cursor: not-allowed;
}

.student-result-card {
  position: sticky;
  top: 105px;
}

.generated-code-list {
  display: grid;
  gap: 12px;
  margin: 18px 0;
}

.generated-code-list div {
  border: 1px solid rgba(8, 169, 217, .28);
  border-radius: 20px;
  padding: 14px;
  background: rgba(230,249,255,.66);
}

.generated-code-list span {
  display: block;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: 11px;
  font-weight: 1000;
  margin-bottom: 5px;
}

.generated-code-list strong {
  display: block;
  font-size: 28px;
  letter-spacing: .02em;
}

.student-result-card.ready {
  background: linear-gradient(160deg, rgba(230,249,255,.95), rgba(255,255,255,.92));
}

.filter-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  gap: 12px;
  margin: 18px 0;
}

.student-code-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.student-code-card {
  border: 1px solid rgba(8,169,217,.22);
  border-radius: 22px;
  background: rgba(255,255,255,.78);
  padding: 16px;
  display: grid;
  gap: 12px;
}

.student-code-card header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.student-code-card h3 {
  margin: 0 0 4px;
  font-size: 20px;
  letter-spacing: -0.03em;
}

.student-code-card small {
  color: var(--muted);
  font-weight: 850;
}

.rank-chip,
.class-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(230,249,255,.9);
  color: #007aa7;
  font-size: 12px;
  font-weight: 1000;
  white-space: nowrap;
}

.code-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.copy-code-btn {
  padding: 10px;
  border-radius: 14px;
  text-align: left;
  font-size: 12px;
}

.copy-code-btn span {
  display: block;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 3px;
}

.copy-code-btn strong {
  display: block;
  color: var(--ink);
  font-size: 15px;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}

.empty-state span {
  font-size: 34px;
}

.empty-state h3 {
  margin: 12px 0 6px;
  color: var(--ink);
}

.hidden {
  display: none !important;
}

body.dark-mode,
.dark-mode body {
  background: radial-gradient(circle at top left, rgba(8,169,217,.16), transparent 35%), #09131a;
}

.dark-mode .students-admin-shell {
  color: #f5fbff;
}

.dark-mode .access-denied-card,
.dark-mode .student-form-card,
.dark-mode .student-result-card,
.dark-mode .students-list-card,
.dark-mode .student-code-card {
  background: rgba(12, 27, 36, .84);
  border-color: rgba(87, 207, 255, .28);
  color: #f5fbff;
}

.dark-mode .student-form-card label,
.dark-mode .copy-code-btn strong,
.dark-mode .empty-state h3,
.dark-mode .student-form-card input,
.dark-mode .student-form-card select,
.dark-mode .student-form-card textarea,
.dark-mode .filter-row input,
.dark-mode .filter-row select {
  color: #f5fbff;
}

.dark-mode .student-form-card input,
.dark-mode .student-form-card select,
.dark-mode .student-form-card textarea,
.dark-mode .filter-row input,
.dark-mode .filter-row select,
.dark-mode .generated-code-list div,
.dark-mode .copy-code-btn,
.dark-mode .ghost-btn {
  background: rgba(255,255,255,.06);
  border-color: rgba(87,207,255,.25);
}

.dark-mode .students-admin-hero {
  box-shadow: 0 24px 70px rgba(0, 0, 0, .38);
}

@media (max-width: 880px) {
  .students-admin-shell {
    width: min(100% - 20px, 620px);
    margin-top: 92px;
  }

  .students-admin-hero,
  .students-admin-grid,
  .form-grid.two,
  .filter-row,
  .student-code-grid {
    grid-template-columns: 1fr;
  }

  .student-result-card {
    position: static;
  }

  .section-heading-row,
  .student-code-card header {
    flex-direction: column;
  }

  .code-actions {
    grid-template-columns: 1fr;
  }
}