:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-elevated: rgba(12, 25, 46, 0.88);
  --bg-soft: rgba(18, 35, 64, 0.7);
  --text: #f4f7fb;
  --muted: #aebbd1;
  --primary: #7dd3fc;
  --primary-strong: #38bdf8;
  --border: rgba(125, 211, 252, 0.18);
  --shadow: 0 24px 80px rgba(2, 8, 23, 0.45);
  --danger: #fda4af;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.18), transparent 32%),
    linear-gradient(180deg, #020617 0%, #07111f 50%, #020617 100%);
}

a {
  color: var(--primary);
}

a:hover {
  color: var(--primary-strong);
}

.page-shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(2, 6, 23, 0.75);
  border-bottom: 1px solid var(--border);
}

.site-header .page-shell {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  font-weight: 600;
}

.hero,
.content-card,
.impressum,
.impressum-page {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
}

.hero {
  margin: 3rem 0 1.5rem;
  padding: clamp(2rem, 4vw, 4rem);
}

.hero h1,
.content-card h2,
.impressum h2,
.impressum-page h1,
.auth-card h1 {
  margin-top: 0;
}

.hero p,
.content-card p,
.auth-card p,
.impressum p,
.impressum li,
.impressum-page p,
.dashboard-card p {
  color: var(--muted);
  line-height: 1.7;
}

.hero-actions,
.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.button-link,
button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: 160ms ease;
}

.button-link,
button {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-strong) 100%);
  color: #04111d;
}

.button-link.secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.button-link:hover,
button:hover,
input:focus {
  transform: translateY(-1px);
}

main {
  padding-bottom: 4rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.content-card,
.dashboard-card,
.auth-card,
.impressum,
.impressum-page {
  padding: 1.5rem;
}

.dashboard-card,
.auth-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.auth-layout {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}

.auth-card {
  width: min(460px, 100%);
}

.form-group {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

label {
  font-weight: 600;
}

input {
  width: 100%;
  min-height: 48px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  padding: 0.85rem 1rem;
  outline: none;
}

.error-message {
  color: var(--danger);
  font-weight: 700;
}

.dashboard-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.85);
}

.site-footer .page-shell {
  padding: 2rem 0 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.5rem;
}

.impressum {
  margin-top: 1rem;
}

.page-section {
  padding: 3rem 0 4rem;
}

.footer-grid--compact {
  grid-template-columns: 1fr;
}

.impressum-page h2 {
  margin-bottom: 0.4rem;
}

@media (max-width: 720px) {
  .site-header .page-shell,
  .footer-grid {
    grid-template-columns: 1fr;
    display: grid;
  }

  .site-header .page-shell {
    justify-content: initial;
  }
}


.learnspace-page,
.learnspace-page body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #10131a;
}

.learnspace-page body {
  min-height: 100vh;
  font-family: Inter, system-ui, sans-serif;
}

#renderCanvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

.learnspace-hud {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 3;
  width: min(26rem, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  pointer-events: none;
}

.learnspace-menu {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  max-height: calc(100vh - 2rem);
  padding: 1rem;
  pointer-events: auto;
  overflow: hidden;
  background: rgba(10, 18, 34, 0.78);
  border: 1px solid rgba(125, 211, 252, 0.2);
  border-radius: 1.15rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.learnspace-menu__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.learnspace-menu__title {
  margin: 0.2rem 0 0;
  font-size: 1.2rem;
}

.learnspace-menu__tree {
  display: grid;
  gap: 0.55rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.learnspace-menu__tree-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: 0.85rem;
  border: 1px solid rgba(125, 211, 252, 0.16);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-weight: 700;
  text-align: left;
}

.learnspace-menu__tree-item::after {
  content: '−';
  color: var(--primary);
  font-size: 1rem;
}

.learnspace-menu__tree-item[aria-expanded='false']::after {
  content: '+';
}

.learnspace-menu__sections {
  display: grid;
  gap: 0.9rem;
  overflow: auto;
  padding-right: 0.2rem;
}

.learnspace-menu--collapsed .learnspace-menu__sections {
  display: none;
}

.learnspace-menu--collapsed .learnspace-menu__tree {
  grid-template-columns: 1fr;
}

.learnspace-card,
.learnspace-panel,
.learnspace-overlay__panel {
  background: rgba(10, 18, 34, 0.88);
  border: 1px solid rgba(125, 211, 252, 0.2);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.learnspace-card {
  padding: 1rem 1.1rem;
  pointer-events: auto;
}

.learnspace-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.learnspace-card__eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary);
}

.learnspace-card h1,
.learnspace-card h2,
.learnspace-card h3,
.learnspace-card p {
  margin-top: 0;
}

.learnspace-card h1,
.learnspace-card h2 {
  margin-bottom: 0.8rem;
}

.learnspace-card p,
.learnspace-card li,
.learnspace-card dd,
.learnspace-card dt,
.learnspace-overlay__panel p,
.learnspace-overlay__panel li,
.learnspace-overlay__panel label,
.learnspace-panel p,
.learnspace-panel li {
  color: var(--muted);
}

.learnspace-badge,
.learnspace-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(125, 211, 252, 0.18);
  background: rgba(125, 211, 252, 0.14);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 700;
}

.learnspace-chip {
  min-height: auto;
  background: rgba(255, 255, 255, 0.06);
}

.learnspace-chip--muted {
  color: var(--muted);
}

.learnspace-meta-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
}

.learnspace-meta-list div {
  padding: 0.75rem;
  border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.learnspace-meta-list dt {
  margin-bottom: 0.3rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.learnspace-meta-list dd {
  margin: 0;
  color: var(--text);
  font-weight: 700;
}

.learnspace-card__footer {
  margin: 0.9rem 0 0;
}

.learnspace-hint-list {
  margin: 0;
  padding-left: 1.15rem;
  display: grid;
  gap: 0.45rem;
}

.learnspace-chat-log {
  display: grid;
  gap: 0.6rem;
  max-height: 12rem;
  overflow: auto;
  padding-right: 0.25rem;
}

.learnspace-chat-log p:last-child {
  margin-bottom: 0;
}

.learnspace-chat-form {
  display: grid;
  gap: 0.65rem;
  margin-top: 0.9rem;
}

.learnspace-chat-form input {
  width: 100%;
  border-radius: 0.75rem;
  border: 1px solid rgba(125, 211, 252, 0.18);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 0.75rem 0.85rem;
}

.learnspace-chat-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.learnspace-error-message {
  margin: 0.75rem 0 0;
  color: var(--danger) !important;
  font-weight: 700;
}

.learnspace-overlay {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: grid;
  place-items: center;
}

.learnspace-overlay[hidden],
.learnspace-panel[hidden] {
  display: none;
}

.learnspace-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 6, 23, 0.7);
}

.learnspace-overlay__panel {
  position: relative;
  width: min(42rem, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1.25rem;
  z-index: 1;
}

.learnspace-overlay__header,
.learnspace-panel__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.learnspace-overlay__content {
  display: grid;
  gap: 1rem;
}

.learnspace-settings-grid {
  display: grid;
  gap: 1rem;
}

.learnspace-setting {
  display: grid;
  gap: 0.5rem;
}

.learnspace-setting select,
.learnspace-setting input[type='range'] {
  width: 100%;
}

.learnspace-panel {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  top: auto;
  z-index: 4;
  width: min(26rem, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1rem 1.1rem;
}

.learnspace-panel__header h2,
.learnspace-panel p,
.learnspace-panel ul {
  margin: 0 0 0.9rem;
}

.learnspace-panel ul {
  padding-left: 1.25rem;
}

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

.learnspace-panel__close {
  min-height: 2.25rem;
  min-width: 2.25rem;
  padding: 0;
  border-radius: 999px;
}

.learnspace-panel__feedback {
  color: var(--primary) !important;
  font-weight: 700;
}

.learnspace-is-overlay-open #renderCanvas {
  cursor: default;
}

@media (max-width: 960px) {
  .learnspace-hud {
    top: 0.75rem;
    left: 0.75rem;
    width: min(24rem, calc(100vw - 1.5rem));
    max-height: calc(100vh - 1.5rem);
  }

  .learnspace-menu {
    max-height: calc(100vh - 1.5rem);
    padding: 0.85rem;
  }
}

@media (max-width: 640px) {
  .learnspace-hud {
    top: 0.5rem;
    left: 0.5rem;
    width: calc(100vw - 1rem);
    max-height: calc(100vh - 1rem);
  }

  .learnspace-menu {
    max-height: calc(100vh - 1rem);
    padding: 0.75rem;
  }

  .learnspace-menu__header,
  .learnspace-card__header {
    flex-wrap: wrap;
  }

  .learnspace-menu__tree,
  .learnspace-meta-list {
    grid-template-columns: 1fr;
  }

  .learnspace-overlay__panel,
  .learnspace-panel {
    width: calc(100vw - 1rem);
  }
}

.learnspace-chat-log__item,
.learnspace-activity-feed__item {
  padding: 0.55rem 0.7rem;
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.learnspace-chat-log__item--system,
.learnspace-activity-feed__item--warning {
  border-color: rgba(253, 164, 175, 0.18);
}

.learnspace-activity-feed__item--success {
  border-color: rgba(125, 211, 252, 0.28);
}

.learnspace-inline-badge {
  display: inline-flex;
  margin-left: 0.4rem;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: rgba(125, 211, 252, 0.12);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 700;
}

.learnspace-activity-feed {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  max-height: 11rem;
  overflow: auto;
}

.learnspace-card--activity .learnspace-card__header,
.learnspace-card--players .learnspace-card__header {
  align-items: center;
}