/* =============================================================================
   ADVERSARIAL SEARCH SIMULATOR — Stylesheet
   Tema: Putih (#FFFFFF) · Biru (#0056b3) · Merah (#dc3545)
   Font: Inter (UI) · JetBrains Mono (kode/angka)
   ============================================================================= */

/* ── Reset & Custom Properties ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --putih      : #ffffff;
  --abu-muda   : #f5f7fa;
  --abu-border : #e2e8f0;
  --abu-teks   : #64748b;
  --teks-gelap : #1e293b;

  --biru       : #0056b3;
  --biru-muda  : #dbeafe;
  --biru-hover : #004494;
  --biru-glow  : rgba(0, 86, 179, 0.15);

  --merah      : #dc3545;
  --merah-muda : #fee2e2;
  --merah-hover: #b91c2c;

  --hijau      : #16a34a;

  --radius-sm  : 6px;
  --radius-md  : 12px;
  --radius-lg  : 16px;

  --shadow-sm  : 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md  : 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg  : 0 10px 30px rgba(0,0,0,.10), 0 4px 10px rgba(0,0,0,.06);
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--abu-muda);
  color: var(--teks-gelap);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

/* ── Header ─────────────────────────────────────────────────────────────────── */
.site-header {
  background: var(--putih);
  border-bottom: 2px solid var(--biru);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-brand { display: flex; align-items: center; gap: 0.75rem; }

.header-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--biru);
  background: var(--biru-muda);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.header-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--teks-gelap);
  letter-spacing: -0.01em;
}

.header-sub {
  font-size: 0.7rem;
  color: var(--abu-teks);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.05em;
}

.header-meta { display: flex; align-items: center; gap: 0.5rem; }

/* ── Badge ─────────────────────────────────────────────────────────────────── */
.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 99px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.badge-blue    { background: var(--biru);    color: var(--putih); }
.badge-outline { background: transparent; color: var(--abu-teks); border: 1.5px solid var(--abu-border); }

/* ── Layout Utama ───────────────────────────────────────────────────────────── */
.main-layout {
  flex: 1;
  max-width: 1280px;
  margin: 1.5rem auto;
  padding: 0 1.25rem 2rem;
  display: grid;
  grid-template-columns: 260px 1fr 300px;
  gap: 1.25rem;
  align-items: start;
}

/* ── Panel Dasar ─────────────────────────────────────────────────────────────── */
.panel {
  background: var(--putih);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--abu-border);
}

.panel-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--abu-teks);
  margin-bottom: 1.1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--abu-border);
}

/* ── Panel Kontrol ─────────────────────────────────────────────────────────── */
.control-group { margin-bottom: 1.25rem; }

.control-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--teks-gelap);
  margin-bottom: 0.5rem;
}

/* Toggle Algoritma */
.toggle-wrapper { display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem; }

.toggle-btn {
  padding: 0.5rem 0.4rem;
  font-size: 0.72rem;
  font-weight: 600;
  border: 2px solid var(--abu-border);
  border-radius: var(--radius-sm);
  background: var(--putih);
  color: var(--abu-teks);
  cursor: pointer;
  transition: all 0.18s ease;
  font-family: inherit;
}

.toggle-btn:hover { border-color: var(--biru); color: var(--biru); }

.toggle-btn.active {
  background: var(--biru);
  border-color: var(--biru);
  color: var(--putih);
  box-shadow: 0 2px 8px var(--biru-glow);
}

.control-hint {
  font-size: 0.7rem;
  color: var(--abu-teks);
  margin-top: 0.4rem;
  line-height: 1.4;
}

/* Depth Slider */
.depth-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--biru-muda);
  color: var(--biru);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.depth-slider {
  width: 100%;
  accent-color: var(--biru);
  height: 4px;
  cursor: pointer;
  margin: 0.3rem 0;
}

.depth-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--abu-teks);
  margin-top: 0.25rem;
}

/* Status Box */
.status-box {
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  border-left: 3px solid;
  line-height: 1.4;
}

.status-human { background: var(--merah-muda); border-color: var(--merah); color: var(--merah-hover); }
.status-ai    { background: var(--biru-muda);  border-color: var(--biru);  color: var(--biru-hover);  }
.status-draw  { background: #fef9c3; border-color: #ca8a04; color: #92400e; }
.status-win   { background: #dcfce7; border-color: var(--hijau); color: #14532d; }
.status-thinking {
  background: var(--biru-muda);
  border-color: var(--biru);
  color: var(--biru);
  animation: blink 0.8s ease-in-out infinite alternate;
}

@keyframes blink { from { opacity: 0.6; } to { opacity: 1; } }

/* Reset Button */
.btn-reset {
  width: 100%;
  padding: 0.65rem;
  background: var(--teks-gelap);
  color: var(--putih);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease;
  font-family: inherit;
  margin-bottom: 1rem;
}
.btn-reset:hover { background: #334155; }

/* Legenda */
.legenda { display: flex; gap: 0.75rem; }
.legenda-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.72rem; color: var(--abu-teks); }

.mark {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.78rem;
}
.mark-x { background: var(--merah-muda); color: var(--merah); }
.mark-o { background: var(--biru-muda);  color: var(--biru);  }

/* ── Panel Papan ─────────────────────────────────────────────────────────────── */
.panel-board { display: flex; flex-direction: column; align-items: center; gap: 1.25rem; }

.board-container {
  position: relative;
  width: 100%;
  max-width: 360px;
}

/* Grid papan 3×3 */
.board-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  aspect-ratio: 1;
  width: 100%;
  max-width: 360px;
}

/* Setiap sel papan */
.cell {
  background: var(--abu-muda);
  border: 2px solid var(--abu-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 800;
  cursor: pointer;
  transition: all 0.15s ease;
  aspect-ratio: 1;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.cell:hover:not(.occupied) {
  background: #f0f4ff;
  border-color: var(--biru);
  transform: scale(1.04);
  box-shadow: 0 0 0 3px var(--biru-glow);
}

.cell:active:not(.occupied) { transform: scale(0.97); }

/* Sel terisi oleh Human (X) — Merah */
.cell.human {
  background: var(--merah-muda);
  border-color: var(--merah);
  color: var(--merah);
  cursor: not-allowed;
  animation: popIn 0.2s cubic-bezier(.175,.885,.32,1.275);
}

/* Sel terisi oleh AI (O) — Biru */
.cell.ai {
  background: var(--biru-muda);
  border-color: var(--biru);
  color: var(--biru);
  cursor: not-allowed;
  animation: popIn 0.2s cubic-bezier(.175,.885,.32,1.275);
}

/* Sel bagian dari garis kemenangan */
.cell.menang {
  animation: winPulse 0.5s ease forwards;
}

.cell.human.menang { background: var(--merah); color: var(--putih); border-color: var(--merah-hover); }
.cell.ai.menang    { background: var(--biru);  color: var(--putih); border-color: var(--biru-hover);  }

.cell.occupied { cursor: not-allowed; }
.cell.disabled { cursor: not-allowed; opacity: 0.85; }

@keyframes popIn {
  0%   { transform: scale(0.6); opacity: 0.4; }
  80%  { transform: scale(1.08); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes winPulse {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* Overlay akhir permainan */
.game-over-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.92);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  animation: fadeIn 0.3s ease;
}
.game-over-overlay.hidden { display: none; }

.game-over-card { text-align: center; }
.game-over-icon { font-size: 2.5rem; margin-bottom: 0.4rem; }
.game-over-msg  { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.75rem; color: var(--teks-gelap); }

.btn-reset-small {
  padding: 0.5rem 1.5rem;
  background: var(--biru);
  color: var(--putih);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.82rem;
  transition: background 0.15s;
}
.btn-reset-small:hover { background: var(--biru-hover); }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Skor sesi */
.score-row {
  display: flex;
  gap: 0.75rem;
  width: 100%;
  max-width: 360px;
}

.score-item {
  flex: 1;
  text-align: center;
  padding: 0.6rem 0.4rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--abu-border);
}

.score-label { font-size: 0.65rem; font-weight: 600; color: var(--abu-teks); text-transform: uppercase; letter-spacing: 0.05em; }
.score-val   { font-family: 'JetBrains Mono', monospace; font-size: 1.5rem; font-weight: 700; margin-top: 0.15rem; }

.score-human { border-color: var(--merah); background: var(--merah-muda); }
.score-human .score-val { color: var(--merah); }
.score-draw  { border-color: var(--abu-border); }
.score-draw .score-val  { color: var(--teks-gelap); }
.score-ai    { border-color: var(--biru); background: var(--biru-muda); }
.score-ai .score-val    { color: var(--biru); }

/* ── Panel Metrik ─────────────────────────────────────────────────────────────── */
.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}

.metric-card {
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  text-align: center;
  border: 1.5px solid;
}

.metric-card.metric-minimax {
  background: #fffbeb;
  border-color: #fbbf24;
}
.metric-card.metric-ab {
  background: var(--biru-muda);
  border-color: var(--biru);
}

.metric-label    { font-size: 0.62rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--abu-teks); margin-bottom: 0.25rem; }
.metric-val      { font-family: 'JetBrains Mono', monospace; font-size: 1.3rem; font-weight: 700; color: var(--teks-gelap); }
.metric-sublabel { font-size: 0.6rem; color: var(--abu-teks); margin-top: 0.15rem; }

.metric-minimax .metric-val { color: #92400e; }
.metric-ab .metric-val      { color: var(--biru-hover); }

/* Efisiensi Box */
.efisiensi-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #dcfce7;
  border: 1.5px solid #86efac;
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.9rem;
}
.efisiensi-box.hidden { display: none; }
.efisiensi-label { font-size: 0.72rem; font-weight: 600; color: #14532d; }
.efisiensi-val   { font-family: 'JetBrains Mono', monospace; font-weight: 700; font-size: 0.9rem; color: var(--hijau); }

/* Metric Row */
.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--abu-border);
  font-size: 0.75rem;
}
.metric-row:last-of-type { border-bottom: none; }

.metric-inline-label { color: var(--abu-teks); font-weight: 500; }
.metric-inline-val   { font-family: 'JetBrains Mono', monospace; font-weight: 600; color: var(--teks-gelap); }

/* ── Visualisasi Game Tree ───────────────────────────────────────────────────── */
.tree-section { margin-top: 1rem; }

.tree-header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--abu-border);
}
.tree-title { font-size: 0.75rem; font-weight: 700; color: var(--teks-gelap); }
.tree-sub   { font-size: 0.65rem; color: var(--abu-teks); }

.tree-container {
  max-height: 380px;
  overflow-y: auto;
  overflow-x: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  background: #0f172a;
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  color: #94a3b8;
  scrollbar-width: thin;
  scrollbar-color: #334155 #0f172a;
}

.tree-empty {
  color: #475569;
  font-style: italic;
  text-align: center;
  padding: 1rem 0;
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
}

/* Node pohon */
.tree-node { display: block; line-height: 1.7; }

.tree-node-line {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 2px 4px;
  border-radius: 3px;
  transition: background 0.1s;
}
.tree-node-line:hover { background: rgba(255,255,255,0.05); }

.tree-indent { display: inline-block; width: 1.4em; }

.tree-connector { color: #475569; }

.tree-node-max  .tree-node-type { color: #60a5fa; font-weight: 700; }  /* MAX (AI) = Biru */
.tree-node-min  .tree-node-type { color: #f87171; font-weight: 700; }  /* MIN (Human) = Merah */
.tree-node-leaf .tree-node-type { color: #94a3b8; }

.tree-node-skor { color: #a78bfa; font-weight: 600; }

.tree-papan-mini {
  display: inline-grid;
  grid-template-columns: repeat(3, 8px);
  grid-template-rows: repeat(3, 8px);
  gap: 1px;
  margin-left: 4px;
  vertical-align: middle;
}
.tree-sel {
  width: 8px;
  height: 8px;
  border-radius: 1px;
  background: #1e293b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5px;
  font-weight: 700;
}
.tree-sel.x { background: #7f1d1d; color: #fca5a5; }
.tree-sel.o { background: #1e3a5f; color: #93c5fd; }

.tree-pruned {
  color: #475569;
  font-style: italic;
  padding: 2px 4px;
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--putih);
  border-top: 1px solid var(--abu-border);
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.68rem;
  color: var(--abu-teks);
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ── Responsif Mobile ──────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "board control"
      "metrics metrics";
  }
  .panel-control  { grid-area: control; }
  .panel-board    { grid-area: board; }
  .panel-metrics  { grid-area: metrics; }
}

@media (max-width: 640px) {
  .main-layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "board"
      "control"
      "metrics";
    padding: 0 0.75rem 1.5rem;
    gap: 1rem;
  }

  .board-grid  { max-width: 280px; margin: 0 auto; }
  .score-row   { max-width: 280px; }
  .board-container { max-width: 280px; margin: 0 auto; }

  .header-meta   { display: none; }
  .header-title  { font-size: 0.88rem; }

  .metrics-grid { grid-template-columns: 1fr 1fr; }

  .site-footer { flex-direction: column; text-align: center; }
}