:root {
  --rd-primary: #2563eb;
  --rd-primary-soft: #e0edff;
  --rd-accent: #22c55e;
  --rd-muted: #6b7280;
  --rd-bg: #f5f7fb;
  --rd-danger: #dc2626;
  --rd-warning: #f97316;
  --rd-radius-lg: 1.25rem;
  --rd-radius-md: 0.75rem;
  --rd-transition-fast: 150ms ease-out;
  --rd-transition-med: 220ms ease-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background-color: var(--rd-bg);
}

/* Layout */

.app-header {
  cursor: pointer;
}

.app-header:hover {
  background-color: rgba(241, 245, 249, 0.9);
}

.app-header,
.app-footer {
  background-color: #ffffff;
  height: 48px;
  Padding: 10px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  background: var(--rd-primary-soft);
  color: var(--rd-primary);
  font-size: 1.1rem;
}

.page-card {
  border-radius: var(--rd-radius-lg);
}

/* Page transitions */

.page-section {
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity var(--rd-transition-med),
    transform var(--rd-transition-med);
}

.page-section.active {
  opacity: 1;
  transform: translateY(0);
}

/* Simple fade-in for inner content */

.fade-in {
  animation: fadeInUp 300ms ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Global alert */

#globalAlert {
  border-radius: var(--rd-radius-md);
}

/* Sign-up form */

#signupForm .form-control {
  transition:
    box-shadow var(--rd-transition-fast),
    border-color var(--rd-transition-fast);
}

#signupForm .form-control:focus {
  box-shadow: 0 0 0 0.15rem rgba(37, 99, 235, 0.15);
  border-color: var(--rd-primary);
}

/* Password strength bar colors */

.password-weak {
  background-color: var(--rd-danger) !important;
}

.password-medium {
  background-color: var(--rd-warning) !important;
}

.password-strong {
  background-color: var(--rd-accent) !important;
}

/* Survey */

.char-counter {
  position: absolute;
  right: 0.75rem;
  bottom: 0.5rem;
  font-size: 0.75rem;
  color: var(--rd-muted);
}

.char-counter.warn {
  color: var(--rd-warning);
}

.char-counter.error {
  color: var(--rd-danger);
}

/* Transcript collapse override */

.transcript .card {
  border-radius: var(--rd-radius-md);
}

/* Concept map */

.concept-map-container {
  background: #ffffff;
  border-radius: var(--rd-radius-md);
  padding: 0.75rem 0.75rem 0.5rem;
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.concept-map-viewport {
  background: radial-gradient(circle at top, #eef2ff, #ffffff);
  border-radius: var(--rd-radius-md);
  overflow: hidden;
  border: 1px dashed rgba(15, 23, 42, 0.1);
  cursor: grab;
  height: 320px;
  position: relative;
}

.concept-map-viewport:active {
  cursor: grabbing;
}

#conceptMapSvg {
  width: 100%;
  height: 100%;
  user-select: none;
}

/* Nodes */

.concept-node circle {
  fill: #ffffff;
  stroke: var(--rd-primary);
  stroke-width: 2;
  transition:
    transform var(--rd-transition-med),
    fill var(--rd-transition-med),
    stroke var(--rd-transition-med);
}

.concept-node text {
  fill: #0f172a;
  font-size: 13px;
  text-anchor: middle;
  dominant-baseline: middle;
}

.concept-node:hover circle {
  transform: scale(1.05);
  fill: var(--rd-primary-soft);
}

/* Edges */

.concept-edge {
  stroke: rgba(15, 23, 42, 0.35);
  stroke-width: 1.5;
}

/* Concept detail card */

.concept-detail-card {
  border-radius: var(--rd-radius-md);
}

/* Hub tabs */

.nav-tabs .nav-link {
  border: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.4rem;
  transition:
    color var(--rd-transition-fast),
    border-color var(--rd-transition-fast),
    background-color var(--rd-transition-fast);
}

.nav-tabs .nav-link:hover {
  background-color: rgba(148, 163, 184, 0.08);
}

.nav-tabs .nav-link.active {
  color: var(--rd-primary);
  border-bottom-color: var(--rd-primary);
  background-color: transparent;
}

/* Buttons */

.btn-primary {
  background-color: var(--rd-primary);
  border-color: var(--rd-primary);
}

.btn-primary:hover {
  background-color: #1d4ed8;
  border-color: #1d4ed8;
}

.btn-primary:active {
  background-color: #1e40af !important;
  border-color: #1e40af !important;
}

.btn-outline-secondary:hover {
  background-color: rgba(148, 163, 184, 0.08);
}

/* Footer text */

#progressFooterText {
  font-weight: 500;
}

/* Utilities */

.d-none {
  display: none !important;
}

/* Small screen tweaks */

@media (max-width: 575.98px) {
  .page-card {
    border-radius: 1rem;
  }
}


/* wide page with responsive constraints */
.hub-outer {
  width: 100%;
  padding-left: 1rem;
  padding-right: 1rem;
}
.hub-inner {
  max-width: 1200px; /* wider max width for large screens */
  margin-left: auto;
  margin-right: auto;
}

/* Hero area */
.learning-hero {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

/* Gradient, colorful H2 */
.learning-hero h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  margin: 0;
  font-weight: 700;
  line-height: 1.05;
  background: linear-gradient(90deg, #1652b0 0%, #4fb0f7 45%, #8ee3c0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 4px 18px rgba(30, 95, 179, 0.10);
}

/* lighter subtitle with a longer divider line */
.learning-hero h4 {
  font-size: 1rem;
  color: rgba(31, 41, 55, 0.65);
  font-weight: 600;
  margin: 0;
  padding-bottom: 0.65rem;
  position: relative;
}

/* Extend the straight line under the subtitle to ~90% width */
.learning-hero h4::after {
  content: "";
  position: absolute;
  left: 0;
  right: 10%; /* previously 40% — now 10% for much longer line */
  bottom: -0.6rem;
  height: 2px;
  background: linear-gradient(90deg, rgba(30,95,179,0.12), rgba(30,95,179,0.06));
  border-radius: 2px;
}

/* Cards container layout — keep roomy spacing */
.learning-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .learning-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 576px) {
  .learning-cards {
    grid-template-columns: 1fr;
  }
}

/* Card style & interactivity */
.learning-card {
  border-radius: 1rem;
  overflow: hidden;
  transition: transform 180ms ease, box-shadow 180ms ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid rgba(15, 23, 42, 0.06);
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  box-shadow: 0 6px 18px rgba(24, 58, 110, 0.04);
}

.learning-card:hover,
.learning-card:focus-within {
  transform: translateY(-6px);
  box-shadow: 0 22px 48px rgba(24, 58, 110, 0.10);
}

/* Card content */
.learning-card .card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: row;
  gap: 0.75rem;
  align-items: flex-start;
  flex: 1;
}

.learning-card .card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  color: #0f1724;
}

.learning-card .card-text {
  font-size: 0.92rem;
  color: rgba(15, 23, 42, 0.65);
  margin: 0;
  flex: 1;
}

/* footer area for button */
.learning-card .card-footer {
  padding: 0.9rem 1.25rem;
  background: transparent;
  border-top: 1px solid rgba(15, 23, 42, 0.03);
  display: flex;
  justify-content: flex-end;
}


.learning-card .icon-circle svg {
  width: 28px;
  height: 28px;
  display: block;
  fill: #ffffff;        /* white icons */
  stroke: none;
}


.learning-card .icon-circle {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(135deg,#1e3a8a 0%,#2563eb 50%,#38bdf8 100%);
  box-shadow: 0 6px 16px rgba(30,64,175,0.18), inset 0 1px 0 rgba(255,255,255,0.12);
}


.learning-card .icon-circle svg {
  margin: 0;
}



/* small "View" button */
.btn-view {
  min-width: 92px;
  border-radius: 999px;
  font-weight: 600;
}

/* ensure full-card clickable link doesn't hide buttons */
.learning-card a.card-link {
  position: absolute;
  inset: 0;
  z-index: 0;
  text-indent: -9999px;
  overflow: hidden;
}

/* keep footer buttons visible above full-card link */
.learning-card .card-footer .btn {
  z-index: 2;
}

/* small aesthetic helpers */
.section-note {
  color: rgba(15, 23, 42, 0.55);
  font-size: 0.9rem;
}