/* layout.css — page structure */
body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

/* TEND page shell */
.tend-game-nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 44px;
  padding: 8px 20px;
  background: rgba(248, 249, 250, 0.96);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.tend-game-nav a {
  color: var(--color-text);
  text-decoration: none;
}

.tend-game-nav a:first-child {
  color: var(--color-accent-dark);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.tend-game-nav a:hover,
.tend-game-nav a:focus-visible {
  color: var(--color-accent);
}

/* Screen switching */
.screen {
  display: none;
  width: 100%;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  min-height: 100vh;
}

.screen.active {
  display: flex;
}

/* ── Select screen ── */
.select-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  text-align: center;
}

.game-title {
  font-size: var(--font-size-title);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.game-subtitle {
  font-size: var(--font-size-subtitle);
  color: var(--color-text-muted);
  margin-top: calc(var(--gap-xs) * -1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.select-prompt {
  font-size: clamp(0.95rem, 3vw, 1.1rem);
  color: var(--color-text-muted);
}

.symbol-buttons {
  display: flex;
  gap: var(--gap-lg);
}

.symbol-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-sm);
  padding: var(--gap-lg) var(--gap-xl);
  background: var(--color-surface);
  border: 2px solid var(--color-line);
  border-radius: var(--border-radius);
  transition: transform var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  min-width: 120px;
}

.symbol-btn:hover {
  transform: translateY(-4px) scale(1.03);
  border-color: var(--color-accent);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.15);
}

.symbol-btn:active {
  transform: translateY(0) scale(0.98);
}

.symbol-icon {
  font-size: clamp(2.4rem, 8vw, 3.4rem);
  font-weight: 800;
  line-height: 1;
}

.x-icon { color: var(--color-x); }
.o-icon { color: var(--color-o); }

.symbol-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ── Game screen ── */
.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-lg);
  padding: var(--gap-lg) var(--gap-md);
  position: relative;
  width: 100%;
  max-width: 440px;
}

.game-title-small {
  font-size: clamp(1.2rem, 4vw, 1.5rem);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

/* ── Status bar ── */
.status-bar {
  font-size: var(--font-size-status);
  color: var(--color-text-muted);
  font-weight: 500;
  min-height: 1.6em;
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
}

/* ── Utilities ── */
.hidden { display: none !important; }