:root {
  --bg:            #141419;
  --panel:         #1d1d24;
  --surface:       #2a2a33;
  --text:          #ececf0;
  --text-muted:    #9195a3;
  --border:        #33333d;
  --border-strong: #45454f;
  --accent:        #6d8bff;
  --success:       #4ade80;
  --danger:        #f87171;
  --on-accent:     #ffffff;
  --radius:        1.2rem;   /* 12px */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font);
  font-size: 1.6rem;
  background: var(--bg);
  color: var(--text);
}

html {
  font-size: 62.5%;   /* 1rem = 10px (16px varsayılanın %62.5'i) */
}

.screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.4rem;
}

.hidden { display: none; }

.panel {
  background: var(--panel);
  border-radius: 1.6rem;
  padding: 4.3rem 3.2rem;
  width: 100%;
  max-width: 70rem;
  text-align: center;
}

.logo-letters {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 3.2rem;
}

.logo-letters span {
  width: 4rem;
  height: 4.6rem;
  background: var(--surface);
  border: 0.1rem solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.9rem;
  font-weight: 500;
}

.logo-letters span:nth-child(1) { transform: rotate(-6deg); }
.logo-letters span:nth-child(2) { transform: rotate(4deg); }
.logo-letters span:nth-child(3) { transform: rotate(-3deg); }
.logo-letters span:nth-child(4) { transform: rotate(7deg); }
.logo-letters span:nth-child(5) { transform: rotate(-5deg); }
.logo-letters span:nth-child(6) { transform: rotate(3deg); }

h1 {
  font-size: 2.8rem;
  font-weight: 500;
  margin-bottom: 0.8rem;
}

.subtitle {
  font-size: 1.5rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 3.2rem;
}

.btn {
  font-family: inherit;
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--on-accent);
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  padding: 1.2rem 3.2rem;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.btn:hover { filter: brightness(1.08) }
.btn:active { transform: scale(0.98); }

.btn:focus-visible {
  outline: 0.3rem solid var(--accent);
  outline-offset: 0.2rem;
}

.btn-secondary {
  margin-top: 2rem;
  background: var(--surface);
  color: var(--text);
  border: 0.1rem solid var(--border-strong);
}

.btn-secondary:hover {
  filter: brightness(1.15);
}

/* Kutular ve taşlar */
.prompt {
  font-size: 1.4rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

#slots {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 2.5rem;
}

.slot {
  width: 4.8rem;
  height: 5.6rem;
  border: 0.2rem dashed var(--border);
  border-radius: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--text);
}

#tiles {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.tile {
  font-family: inherit;
  width: 5rem;
  height: 5rem;
  background: var(--surface);
  border: 0.1rem solid var(--border-strong);
  border-radius: 1rem;
  font-size: 2rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.tile:hover { filter: brightness(1.15); transform: translateY(-0.2rem); }
.tile:active { transform: translateY(0); }

.tile:focus-visible {
  outline: 0.3rem solid var(--accent);
  outline-offset: 0.2rem;
}

/* Durum Stilleri */
.slot.active {
  border-style: solid;
  border-color: var(--accent);
}

.slot.filled {
  border-style: solid;
  border-color: var(--border-strong);
  background: var(--surface);
}

.slot.correct {
  border-style: solid;
  border-color: var(--success);
  background: rgba(74, 222, 128, 0.12);
}

.slot.wrong {
  border-style: solid;
  border-color: var(--danger);
  background: rgba(248, 113, 113, 0.12);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-0.6rem); }
  40% { transform: translateX(0.6rem); }
  60% { transform: translateX(-0.4rem); }
  80% { transform: translateX(0.4rem); }
}

@media (prefers-reduced-motion: reduce) {
  .slot.wrong { animation: none; }
}