:root {
  --color-bg: #0f1a12;
  --color-track: #3a7d44;
  --color-track-dark: #2f6838;
  --color-rail: #c89b5c;
  --color-rail-dark: #9c7640;
  --color-gold: #f2b705;
  --color-cream: #fdf6e3;
  --color-ink: #12201a;
  --color-danger: #e64848;
  --color-ok: #3fb97e;
  --font-display: "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  --font-body: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--color-bg);
  color: var(--color-cream);
  font-family: var(--font-body);
  -webkit-tap-highlight-color: transparent;
}

body {
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-display);
  margin: 0;
}

button {
  font-family: var(--font-body);
  font-weight: 700;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  transition: transform 0.08s ease, filter 0.15s ease;
}

button:active {
  transform: scale(0.96);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-ink);
  padding: 16px 28px;
  font-size: 1.1rem;
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.08);
}

.btn-secondary {
  background: transparent;
  color: var(--color-cream);
  border: 2px solid var(--color-rail);
  padding: 12px 22px;
  font-size: 1rem;
}

input[type="text"] {
  font-family: var(--font-body);
  font-size: 1.1rem;
  padding: 14px 16px;
  border-radius: 12px;
  border: 2px solid var(--color-rail);
  background: var(--color-cream);
  color: var(--color-ink);
  width: 100%;
}

input[type="text"]:focus {
  outline: 3px solid var(--color-gold);
}

.screen {
  position: absolute;
  inset: 0;
  flex-direction: column;
}

/* :not(.active) kasıtlı olarak .screen.active ile aynı (0,2,0) özgüllüğe
   sahip — böylece .center-col gibi eşit özgüllükteki başka bir .display
   kuralı, bu ekranı yanlışlıkla görünür bırakamaz (sıralamadan bağımsız). */
.screen:not(.active) {
  display: none;
}

.screen.active {
  display: flex;
}

.hidden {
  display: none !important;
}

.center-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
  padding: 24px;
}

.muted {
  opacity: 0.7;
  font-size: 0.95rem;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--color-rail-dark);
  color: var(--color-cream);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}