:root {
  --bg: #15161c;
  --panel: #1e1f26;
  --panel-2: #262832;
  --key: #2b2d38;
  --key-edge: #14151b;
  --text: #e6e6e6;
  --muted: #8b8f9c;
  --accent: #5b8cff;
  --accent-glow: rgba(91, 140, 255, 0.55);
  --radius: 10px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app__header h1 {
  margin: 0 0 0.4rem;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
}

.app__subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.output {
  width: 100%;
  min-height: 8.5rem;
  resize: vertical;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--key-edge);
  background: var(--panel);
  color: var(--text);
  font-size: 1.25rem;
  line-height: 1.5;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.output:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.2);
}

.toolbar {
  display: flex;
  gap: 0.6rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--key-edge);
  background: var(--panel-2);
  color: var(--text);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn:hover { background: var(--key); border-color: var(--accent); }
.btn:active { transform: translateY(1px); }

/* Keyboard */
.keyboard {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--panel);
  border: 1px solid var(--key-edge);
  border-radius: var(--radius);
  padding: 0.75rem;
  user-select: none;
}

.krow {
  display: flex;
  gap: 0.4rem;
}

.key {
  flex: 1 1 0;
  min-width: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.3rem;
  border-radius: 6px;
  background: var(--key);
  border: 1px solid var(--key-edge);
  color: var(--text);
  font-size: 1.05rem;
  cursor: pointer;
  transition: background 0.08s ease, color 0.08s ease;
}

.key:hover { background: var(--panel-2); }

.key.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Latin hint in a corner */
.key__hint {
  position: absolute;
  top: 3px;
  right: 5px;
  font-size: 0.6rem;
  color: var(--muted);
  pointer-events: none;
}

.key.active .key__hint { color: rgba(255, 255, 255, 0.7); }

/* Modifier / special keys */
.key--wide { flex-grow: 1.6; }
.key--tab, .key--caps, .key--enter { flex-grow: 1.8; }
.key--backspace { flex-grow: 2; }
.key--shift { flex-grow: 2.4; }
.key--space { flex-grow: 8; }
.key--mod {
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--panel-2);
}

.key--shift.locked {
  background: var(--panel-2);
  color: var(--accent);
  border-color: var(--accent);
}

.key--caps, .key--ctrl, .key--alt, .key--fn {
  cursor: default;
  color: var(--muted);
  opacity: 0.25;
}
.key--caps:hover, .key--ctrl:hover, .key--alt:hover, .key--fn:hover {
  background: var(--panel-2);
}

/* Special-symbol block */
.symbols {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  background: var(--panel);
  border: 1px solid var(--key-edge);
  border-radius: var(--radius);
  padding: 0.75rem;
  user-select: none;
}

.key--sym {
  flex: 0 0 auto;
  min-width: 2.8rem;
  min-height: 2.8rem;
  font-size: 1.2rem;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(1rem);
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 10;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error { background: #d9534f; }

@media (max-width: 640px) {
  :root { font-size: 14px; }
  .key { min-height: 2.5rem; font-size: 0.95rem; }
  .key__hint { display: none; }
  .app { padding: 1.25rem 0.6rem 2rem; }
}