/* Adaptive Learning OS — Landing page (Role-Based Fork) */

* { box-sizing: border-box; }

:root {
  --level-bg: #0f1419;
  --level-surface: #1a2332;
  --level-surface-elevated: #212d3d;
  --level-accent: #58a6ff;
  --level-accent-hover: #79b8ff;
  --level-accent-learner: #7ee787;
  --level-accent-learner-hover: #9ee99e;
  --level-border: #2d3a4d;
  --level-text: #e6edf3;
  --level-muted: #8b949e;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--level-bg);
  color: var(--level-text);
}

.noscript-error {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--level-bg);
  color: #f85149;
}

.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--level-border);
  background: var(--level-surface);
}

.landing-logo {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.level-nav {
  display: flex;
  gap: 0.25rem;
}

.level-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--level-border);
  border-radius: 8px;
  background: transparent;
  color: var(--level-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.level-btn:hover {
  color: var(--level-text);
  border-color: var(--level-accent);
}

.level-btn.active {
  background: var(--level-accent);
  color: var(--level-bg);
  border-color: var(--level-accent);
}

.landing-main {
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* Role fork: Build Mode vs Learn Mode */
.landing-fork .landing-tagline {
  margin: 0 0 2rem;
  font-size: 1rem;
  color: var(--level-muted);
  text-align: center;
}

.fork-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.fork-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  background: var(--level-surface);
  border: 2px solid var(--level-border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--level-text);
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}

.fork-card:hover {
  transform: translateY(-2px);
}

.fork-card-admin {
  border-color: var(--level-border);
}

.fork-card-admin:hover {
  border-color: var(--level-accent);
  background: rgba(88, 166, 255, 0.08);
}

.fork-card-learner {
  border-color: var(--level-border);
}

.fork-card-learner:hover {
  border-color: var(--level-accent-learner);
  background: rgba(126, 231, 135, 0.08);
}

.fork-card-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.fork-card-title {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 600;
}

.fork-card-desc {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  color: var(--level-muted);
  line-height: 1.5;
  flex: 1;
}

.fork-card-cta {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--level-accent);
}

.fork-card-learner .fork-card-cta {
  color: var(--level-accent-learner);
}

.landing-projects {
  padding-top: 2rem;
  border-top: 1px solid var(--level-border);
}

.tiles-title {
  margin: 0 0 0.25rem;
  font-size: 0.875rem;
}

.tiles-desc {
  margin: 0 0 1rem;
  font-size: 0.8125rem;
  color: var(--level-muted);
}

.tiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 140px;
  padding: 1.5rem;
  background: var(--level-surface);
  border: 2px dashed var(--level-border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--level-text);
  transition: border-color 0.2s, background 0.2s;
}

.tile:hover {
  border-color: var(--level-accent);
  background: rgba(88, 166, 255, 0.08);
}

.tile-new,
.tile-start {
  border-style: dashed;
}

.tile-new .tile-icon,
.tile-start .tile-icon {
  font-size: 2rem;
  font-weight: 300;
  color: var(--level-accent);
  margin-bottom: 0.5rem;
}

.tile-new .tile-label,
.tile-start .tile-label {
  font-size: 0.9375rem;
  font-weight: 500;
}

.tile-project {
  border-style: solid;
  text-align: left;
  align-items: stretch;
}

.tile-project .tile-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
  border-radius: 4px;
}

.tile-project .tile-name:hover {
  background: rgba(255, 255, 255, 0.06);
}

.tile-name-edit {
  width: 100%;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.25rem 0.35rem;
  margin: -0.25rem -0.35rem 0.25rem -0.35rem;
  background: var(--level-surface);
  border: 1px solid var(--level-accent);
  border-radius: 4px;
  color: var(--level-text);
}

.tile-name-edit:focus {
  outline: none;
}

.tile-project .tile-meta {
  font-size: 0.75rem;
  color: var(--level-muted);
}

.tile-project .tile-delete {
  margin-top: auto;
  padding: 0.25rem 0;
  font-size: 0.75rem;
  color: var(--level-muted);
  background: none;
  border: none;
  cursor: pointer;
  align-self: flex-start;
}

.tile-project .tile-delete:hover {
  color: #f85149;
}