.concept-app-root {
  --ca-bg: linear-gradient(160deg, #04101b, #0c2340 48%, #153a60);
  --ca-panel: linear-gradient(165deg, rgba(16, 38, 63, 0.95), rgba(8, 20, 38, 0.95));
  --ca-line: rgba(94, 150, 212, 0.34);
  --ca-text: #eef6ff;
  --ca-muted: #a6c2e3;
  --ca-accent: #6fd3ff;
  --ca-accent-2: #55d8a9;
  background: var(--ca-bg);
  color: var(--ca-text);
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
}

.concept-wrap {
  width: min(1100px, 94%);
  margin: 24px auto 96px;
}

.concept-shell {
  border: 1px solid var(--ca-line);
  border-radius: 18px;
  background: var(--ca-panel);
  box-shadow: 0 20px 42px rgba(0, 0, 0, 0.26);
  padding: 18px;
  margin-bottom: 14px;
}

.concept-hero {
  position: relative;
  overflow: hidden;
}

.concept-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at top right, rgba(111, 211, 255, 0.16), transparent 30%),
    radial-gradient(circle at bottom left, rgba(85, 216, 169, 0.12), transparent 28%);
}

.concept-hero > * {
  position: relative;
  z-index: 1;
}

.concept-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font: 800 0.78rem/1 "JetBrains Mono", Consolas, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #bde7ff;
}

.concept-kicker::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--ca-accent), var(--ca-accent-2));
  box-shadow: 0 0 16px rgba(111, 211, 255, 0.4);
}

.concept-title {
  margin: 0.6rem 0 0.45rem;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
}

.concept-lead {
  margin: 0 0 0.9rem;
  color: var(--ca-muted);
  max-width: 68ch;
}

.concept-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.concept-upgrade-panel {
  padding-top: 14px;
}

.concept-upgrade-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.concept-upgrade-card {
  border: 1px solid rgba(111, 211, 255, 0.18);
  border-radius: 14px;
  padding: 0.95rem;
  background: rgba(6, 18, 32, 0.62);
}

.concept-upgrade-card strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 1.2rem;
}

.concept-upgrade-card span {
  color: var(--ca-muted);
  font-size: 0.82rem;
}

.concept-pill,
.concept-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(111, 211, 255, 0.22);
  background: rgba(8, 22, 38, 0.6);
  color: var(--ca-text);
  text-decoration: none;
  font-weight: 700;
}

.concept-link:hover,
.concept-link:focus-visible {
  border-color: rgba(111, 211, 255, 0.5);
  transform: translateY(-1px);
}

.concept-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1.1fr 0.9fr;
}

.concept-form-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.concept-full {
  grid-column: 1 / -1;
}

.concept-shell label,
.concept-shell h2,
.concept-shell h3 {
  color: var(--ca-text);
}

.concept-shell p {
  color: var(--ca-muted);
}

.concept-shell input,
.concept-shell textarea,
.concept-shell select,
.concept-shell button {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--ca-line);
  background: rgba(8, 22, 38, 0.78);
  color: var(--ca-text);
  padding: 0.8rem 0.9rem;
  font: inherit;
}

.concept-shell textarea {
  min-height: 116px;
  resize: vertical;
}

.concept-actions {
  display: flex;
  gap: 10px;
}

.concept-btn-primary {
  border: none !important;
  background: linear-gradient(135deg, var(--ca-accent), var(--ca-accent-2)) !important;
  color: #032033 !important;
  font-weight: 800;
  cursor: pointer;
}

.concept-btn-secondary {
  cursor: pointer;
  font-weight: 700;
}

.concept-seeds {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.concept-seed {
  width: auto !important;
  cursor: pointer;
  padding: 0.65rem 0.78rem !important;
  font-weight: 700;
}

.concept-board-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.concept-board-head input {
  width: min(320px, 100%);
}

.concept-tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin: 0 0 12px;
}

.concept-tools select,
.concept-tools button {
  width: 100%;
  min-width: 0;
}

.concept-stats {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 12px;
}

.concept-stat {
  border: 1px solid var(--ca-line);
  border-radius: 14px;
  padding: 0.95rem;
  background: rgba(6, 18, 32, 0.68);
}

.concept-stat strong {
  display: block;
  font-size: 1.35rem;
  margin-bottom: 0.22rem;
}

.concept-list {
  display: grid;
  gap: 10px;
}

.concept-item {
  border: 1px solid rgba(111, 211, 255, 0.18);
  border-radius: 14px;
  padding: 1rem;
  background: rgba(7, 19, 33, 0.72);
}

.concept-item.is-done {
  border-color: rgba(85, 216, 169, 0.3);
  background: rgba(7, 27, 28, 0.7);
}

.concept-item-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.concept-item-title {
  margin: 0;
  font-size: 1.05rem;
}

.concept-item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.concept-mini-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.34rem 0.62rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 800;
  border: 1px solid rgba(111, 211, 255, 0.2);
  background: rgba(10, 25, 42, 0.9);
}

.concept-mini-pill.is-done {
  color: #c9ffe9;
  border-color: rgba(85, 216, 169, 0.34);
}

.concept-item p {
  margin: 0.4rem 0;
}

.concept-item-stamp {
  color: var(--ca-muted);
  font-size: 0.78rem;
}

.concept-item-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 0.7rem;
}

.concept-item-actions button {
  width: auto;
  cursor: pointer;
  padding: 0.65rem 0.8rem;
}

.concept-empty {
  text-align: center;
  padding: 1.4rem;
  border: 1px dashed rgba(111, 211, 255, 0.25);
  border-radius: 14px;
  color: var(--ca-muted);
}

@media (max-width: 860px) {
  .concept-grid,
  .concept-form-grid,
  .concept-stats,
  .concept-upgrade-grid {
    grid-template-columns: 1fr;
  }

  .concept-actions {
    flex-direction: column;
  }

  .concept-tools {
    flex-direction: column;
  }

  .concept-tools select,
  .concept-tools button {
    width: 100%;
  }

  .concept-board-head input {
    width: 100%;
  }
}