:root {
  --aq-bg-top: #f8fbff;
  --aq-bg-bottom: #f3f6fc;
  --aq-surface: #ffffff;
  --aq-border: #e6ebf2;
  --aq-text-muted: #5f6b7a;
  --aq-shadow: 0 4px 14px rgba(20, 33, 61, 0.05);
  --aq-shadow-strong: 0 10px 24px rgba(20, 33, 61, 0.11);
  --aq-radius: 0.85rem;
  --aq-transition: 0.2s ease;
  --aq-brand: #0d6efd;
  --aq-font-ui: 0.95rem;
  --aq-font-label: 0.92rem;
}

body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.app-bg {
  background: linear-gradient(180deg, var(--aq-bg-top) 0%, var(--aq-bg-bottom) 100%);
  min-height: 100vh;
  transition: background-color var(--aq-transition), color var(--aq-transition);
}

.app-navbar {
  background: linear-gradient(90deg, #0d6efd, #0b5ed7);
  backdrop-filter: saturate(120%) blur(2px);
  box-shadow: 0 6px 18px rgba(13, 110, 253, 0.2);
}

.app-navbar .navbar-brand {
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 1rem;
}

.app-navbar .nav-link {
  border-radius: 0.5rem;
  padding: 0.35rem 0.6rem;
  transition: background-color var(--aq-transition), transform var(--aq-transition);
}

.app-navbar .nav-link:hover {
  background: rgba(255, 255, 255, 0.12);
}

.app-navbar .nav-link.active {
  background: rgba(255, 255, 255, 0.22);
}

.nav-theme-btn {
  border-radius: 0.5rem;
}

.app-content {
  padding-bottom: 3rem;
}

.app-footer {
  border-top: 1px solid var(--aq-border);
  background: rgba(255, 255, 255, 0.55);
}

.app-footer p {
  font-size: 0.9rem;
}

.app-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.app-footer-support {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.8rem;
  font-size: 0.9rem;
}

.app-footer-support a {
  color: inherit;
  font-weight: 600;
  text-decoration: none;
}

.app-footer-support a:hover {
  color: var(--aq-brand);
}

.app-footer-support .app-download-link {
  color: #dc3545;
}

.app-footer-support .app-download-link:hover {
  color: #b02a37;
}

a,
button,
.btn,
.nav-link,
.form-control,
.form-select {
  -webkit-tap-highlight-color: rgba(13, 110, 253, 0.12);
}

.page-header,
.surface-card,
.table-panel {
  background: var(--aq-surface);
  border: 1px solid var(--aq-border);
  border-radius: var(--aq-radius);
  box-shadow: var(--aq-shadow);
}

.page-header {
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.page-header h1,
.page-header .h3 {
  font-weight: 700;
  letter-spacing: 0.1px;
}

.surface-card .card-body {
  padding: 1rem 1.1rem;
}

.surface-card h2.h5,
.surface-card .h5 {
  font-weight: 600;
  margin-bottom: 0.55rem;
}

.soft-muted {
  color: var(--aq-text-muted);
}

.form-label,
.form-check-label,
.form-section-title,
.role-pill,
.badge {
  font-size: var(--aq-font-label);
}

.form-control,
.form-select,
.table,
.btn,
.nav-link,
.navbar-text {
  font-size: var(--aq-font-ui);
}

.table-panel {
  padding: 0.75rem;
}

.table {
  margin-bottom: 0;
}

.table > :not(caption) > * > * {
  vertical-align: middle;
}

.table thead th {
  border-bottom-width: 1px;
  color: #334155;
  font-weight: 600;
}

.role-pill {
  display: inline-block;
  padding: 0.23rem 0.55rem;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.role-admin {
  background: #ffe6e6;
  color: #a52a2a;
}

.role-professor {
  background: #e8f2ff;
  color: #1d4ed8;
}

.form-section-title {
  font-weight: 600;
  color: #334155;
  margin-bottom: 0.45rem;
}

.admin-section-title {
  font-weight: 700;
}

.admin-request-card p {
  word-break: break-word;
}

.admin-inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.admin-inline-actions form.d-inline {
  margin: 0;
}

.admin-users-table td:last-child {
  white-space: normal;
}

.qb-filter-card .form-select {
  max-width: 28rem;
}

.gp-form {
  max-width: 44rem;
}

.gp-choice-grid {
  background: rgba(13, 110, 253, 0.03);
}

.materials-upload-form {
  max-width: 48rem;
}

.materials-filter-form {
  max-width: 28rem;
}

.home-action-buttons {
  justify-content: center;
}

.home-action-buttons > .btn {
  min-width: 13.5rem;
  justify-content: center;
}

.form-control,
.form-select,
.btn {
  border-radius: 0.6rem;
}

.form-control:focus,
.form-select:focus,
.btn:focus-visible,
.nav-link:focus-visible {
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.2);
  border-color: rgba(13, 110, 253, 0.45);
}

.btn {
  transition: transform var(--aq-transition), box-shadow var(--aq-transition);
  font-weight: 500;
}

@media (hover: hover) and (pointer: fine) {
  .btn:hover {
    transform: translateY(-1px);
  }

  .surface-card:hover {
    box-shadow: var(--aq-shadow-strong);
    transform: translateY(-1px);
    transition: box-shadow var(--aq-transition), transform var(--aq-transition);
  }
}

.alert {
  border-radius: 0.75rem;
  border-width: 1px;
  box-shadow: 0 2px 8px rgba(20, 33, 61, 0.04);
}

.badge.text-bg-light.border {
  background: #f8fafc !important;
  color: #334155 !important;
  border-color: #dbe4f0 !important;
}

@media (max-width: 991.98px) {
  .app-content {
    padding-bottom: 2.2rem;
  }

  .app-navbar .navbar-collapse {
    margin-top: 0.7rem;
    padding-top: 0.55rem;
    border-top: 1px solid rgba(255, 255, 255, 0.22);
  }

  .app-navbar .nav-link {
    padding: 0.5rem 0.7rem;
  }

  .page-header {
    padding: 0.9rem 1rem;
  }

  .surface-card .card-body {
    padding: 0.9rem;
  }

  .table-panel {
    padding: 0.6rem;
    overflow-x: auto;
  }

  .app-footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 767.98px) {
  body {
    font-size: 0.95rem;
  }

  .container {
    padding-left: 0.85rem;
    padding-right: 0.85rem;
  }

  .app-navbar {
    margin-bottom: 0.9rem !important;
    box-shadow: 0 8px 20px rgba(13, 110, 253, 0.22);
  }

  .app-navbar .navbar-brand {
    font-size: 0.94rem;
    max-width: 68vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .app-navbar .navbar-nav {
    gap: 0.15rem;
  }

  .app-navbar .nav-item {
    width: 100%;
  }

  .app-navbar .nav-link,
  .app-navbar .nav-theme-btn {
    width: 100%;
    justify-content: flex-start;
    text-align: left;
  }

  .app-navbar .navbar-text {
    display: inline-flex;
    align-items: center;
    margin-top: 0.3rem;
    margin-bottom: 0.45rem;
  }

  .page-header {
    border-radius: 0.75rem;
  }

  .page-header h1 {
    font-size: 1.22rem;
    line-height: 1.3;
  }

  .page-header .lead {
    font-size: 0.96rem;
  }

  .surface-card,
  .table-panel {
    border-radius: 0.75rem;
    box-shadow: 0 4px 12px rgba(20, 33, 61, 0.07);
  }

  .btn {
    min-height: 2.6rem;
  }

  .btn,
  .nav-link,
  .form-control,
  .form-select {
    font-size: 16px;
  }

  .d-flex.gap-2.flex-wrap > .btn {
    flex: 1 1 100%;
  }

  .home-action-buttons > .btn {
    min-width: 0;
  }

  .page-dashboard .surface-card .btn {
    width: 100%;
  }

  .page-courses .courses-add-form > [class*='col-'] {
    width: 100%;
  }

  .page-courses .courses-table th,
  .page-courses .courses-table td {
    white-space: normal;
  }

  .page-courses .courses-table td:last-child {
    text-align: left !important;
  }

  .page-courses .courses-table td:last-child .btn {
    width: 100%;
  }

  .page-questions_bank .qb-add-form .row.g-2 > [class*='col-'] {
    width: 100%;
  }

  .page-questions_bank .type-block .row > [class*='col-'] {
    width: 100%;
  }

  .page-questions_bank .qb-edit-form {
    flex-direction: column;
    align-items: stretch;
  }

  .page-questions_bank .qb-edit-form .btn {
    width: 100%;
  }

  .page-questions_bank .qb-table td,
  .page-questions_bank .qb-table th {
    white-space: normal;
  }

  .page-login form.surface-card,
  .page-register form.surface-card {
    margin-bottom: 0.9rem;
  }

  .page-admin .card-body form.d-inline,
  .page-admin .table td form.d-inline {
    display: block !important;
    margin-right: 0 !important;
    margin-bottom: 0.4rem;
  }

  .page-admin .card-body form.d-inline.ms-2 {
    margin-left: 0 !important;
  }

  .page-admin .card-body .form-control,
  .page-admin .table td .form-control {
    max-width: 100% !important;
  }

  .page-admin .admin-inline-actions {
    display: grid;
    gap: 0.35rem;
  }

  .page-admin .table td:last-child {
    min-width: 17rem;
  }

  .page-generate_print .gp-form {
    max-width: 100% !important;
  }

  .page-generate_print .gp-choice-grid {
    row-gap: 0.4rem !important;
    padding: 0.7rem !important;
  }

  .page-generate_print .gp-choice-grid .form-check-label {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    line-height: 1.25;
  }

  .page-generate_print .form-check {
    padding: 0.45rem 0.55rem;
    border: 1px solid var(--aq-border);
    border-radius: 0.65rem;
    background: var(--aq-surface);
  }

  .alert {
    padding: 0.62rem 0.75rem;
  }

  .page-materials .materials-upload-form,
  .page-materials .materials-filter-form {
    max-width: 100% !important;
  }

  .page-materials .materials-upload-form .row > [class*='col-'] {
    width: 100%;
  }

  .page-materials .materials-table th,
  .page-materials .materials-table td {
    white-space: normal;
  }

  .table {
    min-width: 640px;
  }
}

@media (max-width: 575.98px) {
  .container {
    padding-left: max(0.7rem, env(safe-area-inset-left));
    padding-right: max(0.7rem, env(safe-area-inset-right));
  }

  .page-header,
  .surface-card .card-body,
  .table-panel {
    padding-left: 0.8rem;
    padding-right: 0.8rem;
  }

  .role-pill {
    font-size: 0.84rem;
  }

  .app-content {
    padding-bottom: max(1.1rem, env(safe-area-inset-bottom));
  }

  .app-footer-support {
    flex-direction: column;
    gap: 0.2rem;
  }
}

:root[data-theme='dark'] body.app-bg {
  --aq-bg-top: #0f172a;
  --aq-bg-bottom: #111827;
  --aq-surface: #0b1220;
  --aq-border: #1f2a3c;
  --aq-text-muted: #9ca3af;
  --aq-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
  --aq-shadow-strong: 0 12px 26px rgba(0, 0, 0, 0.5);
  color: #e5e7eb;
}

:root[data-theme='dark'] .soft-muted,
:root[data-theme='dark'] .text-muted {
  color: var(--aq-text-muted) !important;
}

:root[data-theme='dark'] .app-footer {
  background: rgba(11, 18, 32, 0.8);
  border-top-color: #1f2a3c;
}

:root[data-theme='dark'] .table {
  color: #e5e7eb;
}

:root[data-theme='dark'] .table thead th {
  color: #cbd5e1;
}

:root[data-theme='dark'] .table-striped > tbody > tr:nth-of-type(odd) > * {
  --bs-table-accent-bg: rgba(255, 255, 255, 0.03);
}

:root[data-theme='dark'] .table > :not(caption) > * > * {
  border-color: #253146;
}

:root[data-theme='dark'] .form-control,
:root[data-theme='dark'] .form-select {
  background-color: #111b2d;
  border-color: #2a3a55;
  color: #e5e7eb;
}

:root[data-theme='dark'] .form-control::placeholder {
  color: #94a3b8;
}

:root[data-theme='dark'] .btn-outline-primary,
:root[data-theme='dark'] .btn-outline-secondary,
:root[data-theme='dark'] .btn-outline-danger {
  border-color: #4b5563;
  color: #d1d5db;
}

:root[data-theme='dark'] .btn-outline-primary:hover,
:root[data-theme='dark'] .btn-outline-secondary:hover,
:root[data-theme='dark'] .btn-outline-danger:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

:root[data-theme='dark'] .app-navbar .navbar-collapse {
  border-top-color: rgba(255, 255, 255, 0.16);
}

:root[data-theme='dark'] .alert {
  border-color: #334155;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}

:root[data-theme='dark'] .badge.text-bg-light.border {
  background: #111b2d !important;
  color: #d1d5db !important;
  border-color: #334155 !important;
}

:root[data-theme='dark'] .gp-choice-grid {
  background: rgba(148, 163, 184, 0.09);
}