/* Study hub — CRT feed DNA, dual column */
.study-page {
  --study-bg: #070a08;
  --study-panel: rgba(12, 22, 16, 0.92);
  --study-line: #2a4a38;
  --study-gold: #c9a227;
  --study-mint: #7dffa3;
  --study-text: #d8e6d8;
  --study-dim: #6a8a72;
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(ellipse at top, #0f1a12 0%, var(--study-bg) 55%);
  color: var(--study-text);
  font-family: "Segoe UI", system-ui, sans-serif;
}

.study-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--study-line);
  background: rgba(0, 0, 0, 0.45);
  position: sticky;
  top: 0;
  z-index: 20;
}
.study-brand {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--study-mint);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 0.85rem;
}
.study-brand .dim { color: var(--study-dim); }
.study-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  flex: 1;
}
.study-nav a {
  color: var(--study-dim);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}
.study-nav a:hover,
.study-nav a.is-here { color: var(--study-gold); }
.study-ver {
  font-size: 0.7rem;
  color: var(--study-dim);
}

.study-main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.study-hero {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.study-kicker {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--study-gold);
  margin-bottom: 0.35rem;
}
.study-hero h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
  color: var(--study-mint);
}
.study-lead {
  margin: 0;
  max-width: 42rem;
  color: var(--study-dim);
  font-size: 0.92rem;
  line-height: 1.45;
}
.study-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: flex-start;
}

.btn,
.study-btn-primary,
.study-btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--study-line);
  background: #0c1810;
  color: var(--study-text);
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  text-decoration: none;
}
.study-btn-primary {
  border-color: #3d6a48;
  background: linear-gradient(180deg, #1a3a24, #0f2216);
  color: var(--study-mint);
}
.study-btn-ghost { background: transparent; color: var(--study-gold); }
.btn:hover,
.study-btn-primary:hover,
.study-btn-ghost:hover { filter: brightness(1.12); }

.study-layout {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 1rem;
}
@media (max-width: 860px) {
  .study-layout { grid-template-columns: 1fr; }
}

.study-panel {
  background: var(--study-panel);
  border: 1px solid var(--study-line);
  border-radius: 10px;
  padding: 1rem;
}
.study-panel h2,
.study-panel h3 {
  margin: 0 0 0.75rem;
  color: var(--study-gold);
  font-size: 1rem;
}
.study-panel label {
  display: block;
  font-size: 0.75rem;
  color: var(--study-dim);
  margin-bottom: 0.65rem;
}
.study-panel input,
.study-panel select,
.study-panel textarea {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  box-sizing: border-box;
  background: #050805;
  border: 1px solid var(--study-line);
  color: var(--study-text);
  border-radius: 6px;
  padding: 0.45rem 0.55rem;
  font: inherit;
}
.study-panel textarea { font-family: ui-monospace, Consolas, monospace; font-size: 0.82rem; }

.study-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}
.study-filters button {
  background: transparent;
  border: 1px solid var(--study-line);
  color: var(--study-dim);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  cursor: pointer;
}
.study-filters button.is-active {
  color: var(--study-mint);
  border-color: #3d6a48;
  background: rgba(40, 90, 55, 0.25);
}

.study-cards {
  display: grid;
  gap: 0.65rem;
}
.study-card {
  border: 1px solid var(--study-line);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  background: var(--study-panel);
  cursor: pointer;
  transition: border-color 0.15s;
}
.study-card:hover { border-color: #4a7a58; }
.study-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  color: var(--study-mint);
}
.study-card .meta {
  font-size: 0.75rem;
  color: var(--study-dim);
}
.study-card .badge {
  display: inline-block;
  margin-right: 0.35rem;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--study-line);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  color: var(--study-gold);
}
.study-card-actions {
  margin-top: 0.55rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.study-empty {
  color: var(--study-dim);
  font-size: 0.9rem;
}
.study-hint {
  font-size: 0.75rem;
  color: var(--study-dim);
  margin: 0.5rem 0 0;
}

.study-detail-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}
.study-detail-meta { flex: 1; min-width: 12rem; }
.study-detail-meta h2 {
  margin: 0 0 0.25rem;
  color: var(--study-mint);
}
.study-detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.study-detail-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.35fr;
  gap: 1rem;
}
@media (max-width: 860px) {
  .study-detail-grid { grid-template-columns: 1fr; }
}

.study-chapters {
  background: var(--study-panel);
  border: 1px solid var(--study-line);
  border-radius: 10px;
  padding: 0.85rem;
}
.study-chapters-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.study-chapters-head h3 {
  margin: 0;
  color: var(--study-gold);
  font-size: 0.95rem;
}
.study-chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.study-chapter-list li {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 0.45rem 0.55rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--study-text);
}
.study-chapter-list li:hover { background: rgba(255, 255, 255, 0.03); }
.study-chapter-list li.is-active {
  border-color: #3d6a48;
  background: rgba(40, 90, 55, 0.2);
  color: var(--study-mint);
}
.study-chapter-list .sub {
  display: block;
  font-size: 0.7rem;
  color: var(--study-dim);
}

.study-editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.65rem;
}

/* Mini recorder board */
.study-rec-wrap {
  margin: 0.75rem 0 1rem;
  padding: 0.75rem;
  border: 1px solid var(--study-line);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.25);
}
.study-rec-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--study-gold);
  font-size: 0.85rem;
}
.study-rec-body {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-start;
}
.study-mini-board {
  display: grid;
  grid-template-columns: repeat(8, 2rem);
  grid-template-rows: repeat(8, 2rem);
  width: 16rem;
  height: 16rem;
  border: 2px solid #1a3020;
  border-radius: 4px;
  overflow: hidden;
  user-select: none;
}
.study-sq {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  padding: 0;
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
  background: #1a3a28;
  color: #111;
}
.study-sq.is-light { background: #c4d4b8; }
.study-sq.is-dark { background: #5a7a58; color: #0a100c; }
.study-sq.is-sel {
  outline: 2px solid var(--study-gold);
  outline-offset: -2px;
  z-index: 1;
}
.study-rec-controls {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 8rem;
}
.study-pgn-label {
  display: block;
  margin-top: 0.65rem;
  font-size: 0.75rem;
  color: var(--study-dim);
}
.study-pgn-label textarea {
  margin-top: 0.25rem;
  width: 100%;
  box-sizing: border-box;
  background: #050805;
  border: 1px solid var(--study-line);
  color: var(--study-text);
  border-radius: 6px;
  padding: 0.4rem;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.8rem;
}

/* Hero studies strip */
.hero-studies-panel {
  margin: 1rem 0 1.25rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--study-line, #2a4a38);
  border-radius: 10px;
  background: rgba(12, 22, 16, 0.85);
}
.hero-studies-list {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.55rem;
}
.hero-study-card {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem 0.65rem;
  border: 1px solid #2a4a38;
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
}
.hero-study-card:hover { border-color: #4a7a58; }
.hero-study-card strong { color: #7dffa3; }
.hero-study-card .meta { font-size: 0.75rem; color: #6a8a72; }