:root {
  --zemin: #14141a;
  --kart: #1e1e26;
  --kart-kenar: #2e2e3a;
  --yazi: #f0f0f4;
  --soluk: #a6a6b4;
  --vurgu: #4c8dff;
  --uyari: #ffb020;
  --uyari-zemin: #3a2d12;
  --uygun: #3ddc84;
  --uygunsuz: #ff5d5d;
  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --zemin: #f4f5f8;
    --kart: #ffffff;
    --kart-kenar: #dcdde4;
    --yazi: #1a1a20;
    --soluk: #5d5d6b;
    --uyari: #8a5300;
    --uyari-zemin: #fff4d6;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--zemin);
  color: var(--yazi);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
}

.ust {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--kart-kenar);
  position: sticky;
  top: 0;
  background: var(--zemin);
  z-index: 5;
}

.ust h1 { font-size: 20px; margin: 0; letter-spacing: 0.2px; }

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 860px) {
  main { grid-template-columns: 1fr 1fr; }
  .yonerge-panel, .ag-panel, .bilgi-panel { grid-column: 1 / -1; }
}

.panel {
  background: var(--kart);
  border: 1px solid var(--kart-kenar);
  border-radius: 14px;
  padding: 14px;
}

.panel h2 { font-size: 17px; margin: 0 0 8px; }

/* ---- kamera ---- */
.kamera-cerceve {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  overflow: hidden;
  background: #000;
  /* Ayna görüntüsü: kullanıcı küpü sağa götürünce ekranda da sağa gider.
     Izgara da aynı kapsayıcıda olduğu için renk geri bildirimi hizasını korur. */
  transform: scaleX(-1);
}

.kamera-cerceve video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cerceve-cizgi {
  position: absolute;
  inset: 19%;
  border: 2px dashed rgba(255, 255, 255, 0.55);
  border-radius: 8px;
  pointer-events: none;
}

.izgara {
  position: absolute;
  inset: 19%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  pointer-events: none;
}

.izgara-hucre {
  border-radius: 5px;
  border: 2px solid rgba(0, 0, 0, 0.35);
  background: rgba(255, 255, 255, 0.06);
}

.izgara-hucre.uygun { border-color: var(--uygun); }
.izgara-hucre.uygunsuz { border-color: var(--uygunsuz); }

.kamera-not { margin: 10px 0 0; color: var(--soluk); font-size: 13px; }

/* ---- 3B küp ---- */
.kup-panel { display: flex; align-items: center; justify-content: center; }

.kup-alan {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  perspective: 900px;
}

.kup-sahne { position: relative; }

.kup-gorus {
  position: relative;
  width: 54px;
  height: 54px;
  transform-style: preserve-3d;
}

.kup-kutu {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
}

.kup-kare {
  position: absolute;
  inset: 0;
  width: 54px;
  height: 54px;
  border: 2px solid #11111a;
  border-radius: 7px;
  background: #2a2a32;
  backface-visibility: hidden;
}

.kup-kutu.vurgu .kup-kare {
  border-color: var(--vurgu);
  box-shadow: 0 0 10px rgba(76, 141, 255, 0.55);
}

/* ---- yönerge ---- */
.yonerge { font-size: 18px; margin: 0 0 6px; }
.ipucu { color: var(--soluk); font-size: 14px; margin: 0 0 6px; }
.ilerleme { color: var(--soluk); font-size: 13px; margin: 0; font-variant-numeric: tabular-nums; }

.uyari {
  margin: 10px 0 0;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--uyari-zemin);
  color: var(--uyari);
  font-size: 14px;
}

.dugmeler { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.dugme {
  font: inherit;
  font-size: 15px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--kart-kenar);
  background: transparent;
  color: var(--yazi);
  cursor: pointer;
  min-height: 44px;
}

.dugme.kucuk { font-size: 13px; padding: 7px 11px; min-height: 36px; }
.dugme.birincil { background: var(--vurgu); border-color: var(--vurgu); color: #fff; font-weight: 600; }
.dugme:hover:not(:disabled) { filter: brightness(1.12); }
.dugme:disabled { opacity: 0.45; cursor: not-allowed; }
.dugme:focus-visible { outline: 2px solid var(--vurgu); outline-offset: 2px; }

/* ---- açılmış küp (düzeltme) ---- */
.ag-tablo {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  max-width: 560px;
}

.ag-yuz.bos { visibility: hidden; }
.ag-baslik { font-size: 12px; color: var(--soluk); margin-bottom: 4px; }

.ag-kareler {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
}

.ag-hucre {
  aspect-ratio: 1 / 1;
  border: 1px solid rgba(0, 0, 0, 0.4);
  border-radius: 4px;
  padding: 0;
  cursor: pointer;
  min-width: 26px;
}

.ag-hucre.merkez { cursor: default; border-width: 3px; }
.ag-hucre.belirsiz { outline: 2px dashed var(--uyari); outline-offset: 1px; }
.ag-hucre:focus-visible { outline: 2px solid var(--vurgu); outline-offset: 2px; }

.bilgi-liste { margin: 0 0 12px; padding-left: 20px; color: var(--soluk); font-size: 14px; }
.bilgi-liste li { margin-bottom: 4px; }

.alt {
  max-width: 980px;
  margin: 0 auto;
  padding: 8px 16px 28px;
  border-top: 1px solid var(--kart-kenar);
}

.surum { color: var(--soluk); font-size: 13px; margin: 10px 0 4px; font-variant-numeric: tabular-nums; }
.alt a { color: var(--vurgu); }

@media (prefers-reduced-motion: reduce) {
  .kup-kutu, .kup-gorus { transition: none !important; }
}