/* ==========================================================================
   FOCUS MODE — Single Kana Overlay + Practice Canvas
   ========================================================================== */

.focus-mode-overlay {
  position: fixed;
  inset: 0;
  z-index: 50000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s cubic-bezier(0.22, 1, 0.36, 1), visibility 0.35s;
}

.focus-mode-overlay.active {
  opacity: 1;
  visibility: visible;
}

.focus-mode-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(9, 9, 11, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.focus-mode-content {
  position: relative;
  z-index: 1;
  width: min(100%, 520px);
  max-height: 92vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  padding: 2.2rem 1.8rem;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(180deg, rgba(19, 20, 28, 0.96), rgba(14, 18, 27, 0.98));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  transform: scale(0.92) translateY(20px);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  overscroll-behavior: contain;
}

.focus-mode-overlay.active .focus-mode-content {
  transform: scale(1) translateY(0);
}

/* Close button */
.focus-mode-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text, #f5f1e8);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s, transform 0.3s ease;
}

.focus-mode-close:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: rotate(90deg);
}

/* Kana display */
.focus-mode-kana {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(5rem, 16vw, 9rem);
  font-weight: 900;
  line-height: 1;
  color: var(--accent, #40e0d0);
  text-shadow: 0 0 40px rgba(64, 224, 208, 0.22);
  margin-top: 0.5rem;
  user-select: none;
  pointer-events: none;
}

.focus-mode-romaji {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: clamp(1.2rem, 3.5vw, 1.5rem);
  font-weight: 700;
  color: var(--muted-strong, #d3cfde);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

/* Canvas area */
.focus-mode-canvas-wrapper {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
  position: relative;
  transform-origin: center;
  transition: transform 0.25s ease;
}

/* Subtle grid guide */
.focus-mode-canvas-wrapper::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: clamp(30px, 10vw, 50px) clamp(30px, 10vw, 50px);
  pointer-events: none;
  z-index: 0;
}

/* Crosshair center guides */
.focus-mode-canvas-wrapper::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, transparent calc(50% - 1px), rgba(64, 224, 208, 0.08) calc(50% - 1px), rgba(64, 224, 208, 0.08) 50%, transparent 50%),
    linear-gradient(to bottom, transparent calc(50% - 1px), rgba(64, 224, 208, 0.08) calc(50% - 1px), rgba(64, 224, 208, 0.08) 50%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

#focusCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  position: relative;
  z-index: 1;
}

/* Action bar */
.focus-mode-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  justify-content: center;
  flex-wrap: wrap;
}

.focus-btn {
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text, #f5f1e8);
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.5rem;
  min-width: 2.5rem;
  user-select: none;
}

.focus-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.focus-btn:active {
  transform: translateY(0);
}

.focus-btn.primary {
  background: linear-gradient(135deg, var(--accent, #40e0d0), var(--accent-3, #b794f4));
  color: #111319;
  border-color: transparent;
  box-shadow: 0 4px 10px rgba(64, 224, 208, 0.18);
}

.focus-btn.zoom-btn {
  font-size: 1.1rem;
  padding: 0.55rem 0.8rem;
  font-weight: 800;
}

/* Hint text */
.focus-mode-hint {
  font-size: 0.75rem;
  color: var(--muted, #aaa6b9);
  text-align: center;
  margin-top: -0.4rem;
}

/* Mobile tweaks */
@media (max-width: 480px) {
  .focus-mode-content {
    padding: 1.6rem 1rem;
    border-radius: 22px;
    gap: 0.9rem;
    width: 100%;
  }

  .focus-mode-kana {
    font-size: clamp(4.5rem, 20vw, 6.5rem);
    margin-top: 0.3rem;
  }

  .focus-mode-canvas-wrapper {
    aspect-ratio: 1 / 1;
    border-radius: 16px;
  }

  .focus-btn {
    padding: 0.5rem 0.9rem;
    font-size: 0.78rem;
    min-height: 2.3rem;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .focus-mode-overlay,
  .focus-mode-content,
  .focus-mode-close,
  .focus-btn,
  .focus-mode-canvas-wrapper {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}