:root {
  color-scheme: light;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  font-size: 16px;
  line-height: 1.5;
  --color-bg: #eef2f8;
  --color-panel: #ffffff;
  --color-border: #d7e3f7;
  --color-primary: #0a63d1;
  --color-primary-soft: #e6f1ff;
  --color-secondary: #0ea5e9;
  --color-accent: #f59e0b;
  --color-muted: #5b6475;
  --color-dark: #0f172a;
  --radius: 16px;
  --shadow: 0 18px 40px -26px rgba(9, 64, 137, 0.45);
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(160deg, #eef2fb 0%, #f8fafc 55%, #eaf1ff 100%);
  color: var(--color-dark);
}

.hero {
  background: linear-gradient(120deg, #0c7ddf 0%, #0a63d1 52%, #0a3fa9 100%);
  color: #f8fafc;
  padding: 3rem 1rem 2rem;
}

.hero--compact {
  padding-bottom: 1rem;
}

.hero__content {
  max-width: 960px;
  margin: 0 auto;
}

.hero__header {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.hero__heading {
  flex: 1 1 320px;
}

.logos {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex: 0 0 auto;
  margin-bottom: 10px;
}



.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  margin: 0 0 0.5rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin-top: 0;
}

.hero__text {
  max-width: 70ch;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.logo_upao{
  width: 120px;
}

.tabs {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.5rem;
  padding: 0;
  background: transparent;
  border-radius: 0;
  border: none;
  box-shadow: none;
}

.tabs__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.18),
    rgba(255, 255, 255, 0.1)
  );
  color: #e9f1ff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.tabs__item .icon {
  margin-right: 0.1rem;
  width: 1.1em;
  height: 1.1em;
}

.icon {
  width: 1em;
  height: 1em;
  fill: currentColor;
  flex-shrink: 0;
  vertical-align: middle;
  display: inline-block;
}

.tabs__item.is-active {
  background: linear-gradient(135deg, #ffffff, #eef4ff);
  color: var(--color-primary);
  box-shadow: 0 14px 34px -20px rgba(10, 99, 209, 0.65);
}

.tabs__item:hover {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.32), rgba(255, 255, 255, 0.16));
}

.tabs--light .tabs__item {
  background: rgba(255, 255, 255, 0.15);
}

.tabs--light .tabs__item.is-active {
  background: rgba(255, 255, 255, 0.95);
}

.panel {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  margin-top: 2rem;
}

.panel.is-visible {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: panelFade 220ms ease;
}

@keyframes panelFade {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.panel__hint {
  color: var(--color-muted);
}

.card {
  background: linear-gradient(180deg, #ffffff 0%, #f6f8ff 100%);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.card--accent {
  background: linear-gradient(135deg, #e3f0ff 0%, #e8f9ff 100%);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.stack {
  display: grid;
  gap: 1rem;
}

.list {
  padding-left: 1.25rem;
  margin: 0.75rem 0 0;
  color: var(--color-muted);
}

.list li + li {
  margin-top: 0.25rem;
}

.button {
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(135deg, var(--color-primary), #094eb1);
  color: #ffffff;
  border: 1px solid #0b5fc7;
  box-shadow: 0 14px 34px -20px rgba(9, 82, 170, 0.9);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s ease;
}

.button:hover {
  background: linear-gradient(135deg, #0e74e6, #0a60c9);
  transform: translateY(-1px);
  box-shadow: 0 16px 36px -18px rgba(9, 82, 170, 0.8);
}

.button--danger {
  background: #dc2626;
  color: #fff;
}

.button--ghost {
  background: rgba(10, 99, 209, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(10, 99, 209, 0.35);
  box-shadow: none;
}

.button--ghost:hover {
  background: rgba(10, 99, 209, 0.14);
  border-color: rgba(10, 99, 209, 0.55);
}

.empty-state {
  padding: 1.5rem;
  text-align: center;
  color: var(--color-muted);
  background: linear-gradient(135deg, #f5f7ff, #f1fbff);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  margin-top: 1rem;
}

.is-hidden {
  display: none;
}

.session {
  display: grid;
  gap: 0.5rem;
}

.session__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.task {
  display: grid;
  gap: 0.75rem;
}

.task__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.task__session {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  background: linear-gradient(
    135deg,
    rgba(14, 165, 233, 0.15),
    rgba(10, 99, 209, 0.12)
  );
  color: #0b4f9e;
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font-weight: 600;
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.task__contact a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
}

.task__contact a:hover {
  text-decoration: underline;
}

.session__materials {
  margin-top: 0.5rem;
  padding-left: 1rem;
}

.session__header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.session__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: space-between;
  width: 100%;
}

.session__title h3 {
  font-size: 2rem;
  font-family: 'Space Grotesk', 'Inter', system-ui, -apple-system, 'Segoe UI',
    sans-serif;
  display: inline-flex;
  align-items: center;
  text-decoration: solid;
}

.session__title-icon {
  color: #0a63d1;
  background: rgba(10, 99, 209, 0.12);
  border-radius: 10px;
  margin-right: 0.75rem;
  width: 1.3rem;
  height: 1.3rem;
}

.session__teacher {
  font-size: 0.85rem;
  font-weight: 600;
  background: #0a63d1;
  color: #ffffff;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
}

.session__actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.card.session {
  position: relative;
  overflow: hidden;
  border-left: 6px solid #0a63d1;
}

.card.session::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(80% 80% at 15% 20%, rgba(14, 165, 233, 0.08), transparent 60%);
  pointer-events: none;
}

.session__meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: #445066;
  font-weight: 500;
  font-size: 1.02rem;
}

.session__meta .icon {
  color: #0a63d1;
  background: rgba(10, 99, 209, 0.09);
  border-radius: 12px;
  width: 1.15rem;
  height: 1.15rem;
}

.session__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  color: #0a63d1;
  text-decoration: none;
}

.session__link:hover {
  text-decoration: underline;
}
.session__link .icon {
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 10px;
  background: rgba(10, 99, 209, 0.1);
}

.material-session {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, #ffffff 0%, #f2f6ff 100%);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow);
}

.material-session__info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.material-session__info span {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.material-detail__header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

#materialDetail {
  margin-top: 1.25rem;
}

.material-detail__meta {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.material-items {
  display: grid;
  gap: 0.75rem;
}

.material-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.material-item:last-child {
  border-bottom: none;
}

.material-item__meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.material-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: #0b4f9e;
}

.material-pill {
  background: linear-gradient(135deg, #e8f1ff, #e1f6ff);
  color: #0f5fa7;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.75rem;
}

.material-item__actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.intro-image {
  margin: 1.5rem auto 0;
  max-width: 900px;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 22px 50px -32px rgba(15, 30, 70, 0.5);
}

.intro-image img {
  display: block;
  width: 100%;
  height: auto;
}

.form {
  display: grid;
  gap: 1rem;
}

.grid-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  align-items: end;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form__group label {
  font-weight: 600;
  font-size: 0.9rem;
}

.form__hint {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.form__group input,
.form__group select,
.form__group textarea {
  border-radius: 10px;
  border: 1px solid var(--color-border);
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  font-family: inherit;
}

.form__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.message {
  margin-top: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid transparent;
}

.message[data-status='success'] {
  background: #ecfdf5;
  border-color: #6ee7b7;
  color: #065f46;
}

.message[data-status='error'] {
  background: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

.message[data-status='info'] {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1e3a8a;
}

.grid--two {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.admin__actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 1rem;
}

.footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--color-muted);
}

@media (max-width: 640px) {
  .panel__header {
    flex-direction: column;
    align-items: flex-start;
  }
}