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

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #273449;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --green: #22c55e;
  --yellow: #eab308;
  --red: #ef4444;
  --border: #334155;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

#app {
  min-height: 100vh;
  min-height: 100dvh;
  padding: 24px 20px;
  padding-top: max(24px, env(safe-area-inset-top));
  padding-bottom: max(24px, env(safe-area-inset-bottom));
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.screen[hidden] { display: none; }

.hero {
  margin-top: auto;
  text-align: center;
}
.actions {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 8px;
  font-weight: 600;
}

.tagline {
  color: var(--muted);
  font-size: 16px;
}
.hint {
  color: var(--muted);
  font-size: 14px;
}
.status {
  color: var(--muted);
  font-size: 14px;
  min-height: 20px;
}

button {
  width: 100%;
  padding: 16px;
  font-size: 17px;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, transform 0.1s;
}
button:active { transform: scale(0.98); }

button.primary {
  background: var(--accent);
  color: white;
}
button.primary:hover:not(:disabled) { background: var(--accent-hover); }
button.primary:disabled {
  background: var(--surface);
  color: var(--muted);
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
button.secondary:hover { background: var(--surface); }

.code-display {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: 0.25em;
  text-align: center;
  padding: 32px 16px;
  background: var(--surface);
  border-radius: 16px;
  font-family: "SF Mono", "Monaco", "Consolas", monospace;
  text-indent: 0.25em; /* visually centers letter-spaced text */
}

.code-input,
.digit-input {
  width: 100%;
  padding: 20px;
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.3em;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: "SF Mono", "Monaco", "Consolas", monospace;
  text-transform: uppercase;
  text-indent: 0.3em;
}
.code-input:focus,
.digit-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ---- Game screen ---- */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
  padding: 12px 16px;
  border-radius: 12px;
  gap: 12px;
}
.my-secret-block .label {
  display: block;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.my-secret {
  font-size: 20px;
  font-weight: 700;
  font-family: "SF Mono", "Monaco", "Consolas", monospace;
  letter-spacing: 0.1em;
}
.turn-indicator {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 600;
  font-size: 13px;
  white-space: nowrap;
}
.turn-indicator.waiting {
  background: var(--surface-2);
  color: var(--muted);
}

.guess-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  flex: 1;
  min-height: 0;
}
.history-column {
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.history ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
  flex: 1;
  padding-right: 2px;
}

.guess-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}
.guess-cell {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  border-radius: 6px;
  font-family: "SF Mono", "Monaco", "Consolas", monospace;
  color: white;
}
.guess-cell.green  { background: var(--green); }
.guess-cell.yellow { background: var(--yellow); color: #1f1f1f; }
.guess-cell.red    { background: var(--red); }

/* ---- Disconnect banner ---- */
.banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--red);
  color: white;
  padding: 12px 16px;
  padding-bottom: max(12px, env(safe-area-inset-bottom));
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  z-index: 50;
  font-weight: 600;
}
.banner button {
  width: auto;
  padding: 8px 16px;
  background: white;
  color: var(--red);
  font-size: 14px;
}