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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #f5f4ef;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

/* ─── Level label ────────────────────────────────────────────────────────────── */
#level-label {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #c0bfb8;
  margin-bottom: 2.5rem;
}

/* ─── Board ──────────────────────────────────────────────────────────────────── */
#board {
  display: block;
  cursor: pointer;
  overflow: visible;
}

/* ─── Shake animation (blocked arrows) ──────────────────────────────────────── */
@keyframes shake {
  0%   { transform: translateX(0); }
  25%  { transform: translateX(-6px); }
  55%  { transform: translateX(6px); }
  78%  { transform: translateX(-3px); }
  100% { transform: translateX(0); }
}

/* ─── Message ────────────────────────────────────────────────────────────────── */
#message {
  margin-top: 2rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: #c0bfb8;
  text-align: center;
  text-transform: uppercase;
  transition: color 0.4s;
}
#message.win      { color: #3a9e60; }
#message.gameover { color: #c0321f; }

/* ─── Status row (counter + hearts) ─────────────────────────────────────────── */
#status-row {
  margin-top: 0.6rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: center;
  min-height: 1.4rem;
}

#counter {
  font-size: 0.7rem;
  color: #ccc;
  letter-spacing: 0.04em;
}

#hearts {
  display: flex;
  gap: 4px;
  align-items: center;
}

.heart { transition: opacity 0.3s, transform 0.3s; }
.heart.lost { opacity: 0; transform: scale(0.4); }

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
#btn-row {
  margin-top: 1.8rem;
  display: flex;
  gap: 0.8rem;
}

button {
  padding: 0.45rem 1.5rem;
  background: none;
  border: 1.5px solid #d8d7d0;
  border-radius: 20px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #aaa;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
button:hover { border-color: #555; color: #333; }

#btn-next {
  display: none;
  border-color: #3a9e60;
  color: #3a9e60;
}
#btn-next:hover { border-color: #2a7a4a; color: #2a7a4a; }

#btn-retry {
  display: none;
  border-color: #c0321f;
  color: #c0321f;
}
#btn-retry:hover { border-color: #8b1a0f; color: #8b1a0f; }

/* ─── GitHub link (top-left) ─────────────────────────────────────────────────── */
#github-link {
  position: fixed;
  top: 14px;
  left: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: #555;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  opacity: 1;
  transition: opacity 0.2s;
  z-index: 10;
}
#github-link:hover { opacity: 0.55; }
#github-link svg { fill: currentColor; flex-shrink: 0; }

/* ─── Auth bar (top-right) ───────────────────────────────────────────────────── */
#auth-bar {
  position: fixed;
  top: 10px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  z-index: 10;
}
#auth-user {
  color: #aaa;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#auth-bar button {
  margin: 0;
  padding: 0.3rem 0.8rem;
  font-size: 0.65rem;
}
#sync-indicator {
  font-size: 0.62rem;
  color: #3a9e60;
  display: none;
}

/* ─── Mobile header ──────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  #github-link { font-size: 0; gap: 0; }
  #github-link svg { width: 20px; height: 20px; }
  #auth-user { display: none !important; }
  #auth-bar { gap: 6px; top: 8px; right: 8px; }
  #auth-bar button { padding: 0.28rem 0.65rem; font-size: 0.62rem; }
  #level-label { margin-bottom: 1.2rem; }
}

/* ─── Auth modal ─────────────────────────────────────────────────────────────── */
#auth-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(245, 244, 239, 0.88);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
#auth-overlay.open { display: flex; }

#auth-modal {
  position: relative;
  background: #faf9f6;
  border: 1.5px solid #e2e1da;
  border-radius: 16px;
  padding: 2rem 2.2rem 1.8rem;
  width: 300px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

#auth-modal h2 {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #888;
  margin-bottom: 1.4rem;
  text-align: center;
}

#auth-tabs {
  display: flex;
  margin-bottom: 1.4rem;
  border-bottom: 1.5px solid #e2e1da;
}
.auth-tab {
  flex: 1;
  padding: 0.45rem 0;
  background: none;
  border: none;
  border-radius: 0;
  border-bottom: 2px solid transparent;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #bbb;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  margin-bottom: -1.5px;
}
.auth-tab:hover { color: #555; }
.auth-tab.active { color: #333; border-bottom-color: #555; }

#auth-modal input {
  width: 100%;
  padding: 0.55rem 0.8rem;
  margin-bottom: 0.75rem;
  background: #fff;
  border: 1.5px solid #dddbd4;
  border-radius: 10px;
  font-size: 0.78rem;
  color: #333;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}
#auth-modal input:focus { border-color: #999; }

#auth-submit {
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.55rem;
  background: #333;
  border: none;
  border-radius: 10px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #f5f4ef;
  cursor: pointer;
  transition: background 0.2s;
}
#auth-submit:hover { background: #111; }

#auth-error {
  font-size: 0.65rem;
  color: #c0321f;
  text-align: center;
  min-height: 1rem;
  margin-top: 0.6rem;
  letter-spacing: 0.04em;
}

#auth-close {
  position: absolute;
  top: 10px;
  right: 14px;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: #bbb;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  line-height: 1;
}
#auth-close:hover { color: #555; border: none; }