/* ============================================
   Kanji Chill — LoFi Purple Mt. Fuji Aesthetic
   ============================================ */

:root {
  --purple-darkest: #1a0a2e;
  --purple-dark: #2d1b4e;
  --purple-mid: #4a2c6e;
  --purple-light: #7b5ea7;
  --purple-glow: #9f7aca;
  --purple-pale: #c4a8e0;
  --pink-accent: #e8a0bf;
  --peach: #f5c6aa;
  --sunrise-gold: #f5d5a0;
  --cloud-white: #e8dff5;
  --text-light: #f0eaf8;
  --text-muted: #b8a5d4;
  --card-bg: rgba(30, 15, 55, 0.85);
  --card-bg-back: rgba(25, 12, 48, 0.92);
  --glass: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.1);
  --correct-color: #7ecba1;
  --wrong-color: #e07a8e;
  --font-main: 'Zen Maru Gothic', 'Noto Sans JP', sans-serif;
  --font-kanji: 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho Pro', serif;
  --font-english: 'Lilex', serif;
  --font-body-english: 'Work Sans', sans-serif;
  --font-brush: 'Zen Antique Soft', serif;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-main);
  color: var(--text-light);
  background: var(--purple-darkest);
  user-select: none;
  -webkit-user-select: none;
}

/* ============================================
   Background Scene — Mt. Fuji LoFi
   ============================================ */

.bg-scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

/* Base gradient */
.bg-base {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    #1a0a2e 0%,
    #2d1558 30%,
    #1e0e3a 60%,
    #150a28 100%
  );
}

/* Animated gradient blobs */
.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  will-change: transform;
}

.bg-blob-1 {
  width: 60vmax;
  height: 60vmax;
  top: -20%;
  left: -15%;
  background: radial-gradient(circle, #6b3fa0 0%, #4a2080 40%, transparent 70%);
  animation: blobDrift1 8s ease-in-out infinite;
}

.bg-blob-2 {
  width: 50vmax;
  height: 50vmax;
  top: 30%;
  right: -20%;
  background: radial-gradient(circle, #9b4dca 0%, #7b3aaa 30%, transparent 70%);
  animation: blobDrift2 10s ease-in-out infinite;
}

.bg-blob-3 {
  width: 45vmax;
  height: 45vmax;
  bottom: -15%;
  left: 20%;
  background: radial-gradient(circle, #e8a0bf 0%, #c070a0 30%, transparent 70%);
  opacity: 0.35;
  animation: blobDrift3 9s ease-in-out infinite;
}

.bg-blob-4 {
  width: 35vmax;
  height: 35vmax;
  top: 10%;
  left: 40%;
  background: radial-gradient(circle, #5a2d8a 0%, #3d1a6e 40%, transparent 70%);
  opacity: 0.5;
  animation: blobDrift4 12s ease-in-out infinite;
}

.bg-blob-5 {
  width: 40vmax;
  height: 40vmax;
  bottom: 10%;
  right: 10%;
  background: radial-gradient(circle, #8b5ca0 0%, #6a3d88 30%, transparent 70%);
  opacity: 0.3;
  animation: blobDrift5 10s ease-in-out infinite;
}

@keyframes blobDrift1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(8vw, 5vh) scale(1.05); }
  50% { transform: translate(3vw, 10vh) scale(0.95); }
  75% { transform: translate(-5vw, 3vh) scale(1.02); }
}

@keyframes blobDrift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(-6vw, 8vh) scale(1.08); }
  50% { transform: translate(-10vw, 3vh) scale(0.92); }
  75% { transform: translate(-3vw, -5vh) scale(1.04); }
}

@keyframes blobDrift3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(10vw, -5vh) scale(0.95); }
  50% { transform: translate(5vw, -10vh) scale(1.1); }
  75% { transform: translate(-3vw, -3vh) scale(0.98); }
}

@keyframes blobDrift4 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-8vw, 6vh) scale(1.06); }
  66% { transform: translate(5vw, -4vh) scale(0.94); }
}

@keyframes blobDrift5 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(6vw, -8vh) scale(1.04); }
  66% { transform: translate(-4vw, 5vh) scale(0.96); }
}

/* Grain texture overlay */
.bg-grain {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  mix-blend-mode: overlay;
}

/* ============================================
   App Layout
   ============================================ */

.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
  padding: 16px 20px;
}

/* ============================================
   Header
   ============================================ */

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 10px;
  flex-shrink: 0;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.logo-jp {
  font-family: var(--font-kanji);
  font-size: 1rem;
  font-weight: 700;
  color: var(--purple-pale);
  letter-spacing: 0.05em;
}

.logo-en {
  font-family: var(--font-english);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.progress-info {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.progress-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.score-display {
  display: flex;
  gap: 12px;
}

.score {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1;
}

.score svg {
  flex-shrink: 0;
  display: block;
}

.correct-score {
  color: var(--correct-color);
}

.wrong-score {
  color: var(--wrong-color);
}

/* ============================================
   Progress Bar
   ============================================ */

.progress-bar-container {
  width: 100%;
  height: 4px;
  background: var(--glass);
  border-radius: 2px;
  overflow: hidden;
  flex-shrink: 0;
  margin-bottom: 10px;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--purple-light), var(--pink-accent));
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* ============================================
   Difficulty Filter
   ============================================ */

.difficulty-filter {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 6px 0 10px;
  flex-shrink: 0;
}

.filter-btn {
  padding: 5px 14px;
  border: 2px solid rgba(255, 255, 255, 0.06);
  border-radius: 20px;
  background: var(--glass);
  color: var(--text-muted);
  font-family: var(--font-english);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.03em;
}

.filter-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-light);
}

.filter-btn.active {
  background: rgba(159, 122, 202, 0.3);
  border-color: rgba(159, 122, 202, 0.75);
  color: var(--purple-pale);
}

/* Review mode filter bar */
.difficulty-filter.review-mode {
  justify-content: space-between;
  align-items: center;
  max-width: 420px;
  margin: 0 auto;
  width: 100%;
}

.review-mode .filter-btn.missed-tag {
  background: rgba(224, 122, 142, 0.25);
  border-color: rgba(224, 122, 142, 0.4);
  color: var(--wrong-color);
  cursor: default;
}

.review-mode .restart-inline-btn {
  padding: 5px 14px;
  border: 1px solid rgba(126, 203, 161, 0.4);
  border-radius: 20px;
  background: rgba(126, 203, 161, 0.2);
  color: var(--correct-color);
  font-family: var(--font-english);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.03em;
}

.review-mode .restart-inline-btn:hover {
  background: rgba(126, 203, 161, 0.35);
}

/* ============================================
   Card Area
   ============================================ */

.card-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 0;
}

.card-container {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 3 / 4;
  max-height: 55vh;
  perspective: 1200px;
  cursor: pointer;
}

.card {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
}

.card.flipped {
  transform: rotateY(180deg);
}

/* Flip animation — true card flip with overshoot */
.card.flip-to-back {
  animation: flipToBack 0.6s ease forwards;
}

@keyframes flipToBack {
  0% { transform: rotateY(0deg) scale(1); }
  40% { transform: rotateY(100deg) scale(0.92); }
  70% { transform: rotateY(190deg) scale(0.96); }
  100% { transform: rotateY(180deg) scale(1); }
}

.card.flip-to-front {
  animation: flipToFront 0.6s ease forwards;
}

@keyframes flipToFront {
  0% { transform: rotateY(180deg) scale(1); }
  40% { transform: rotateY(80deg) scale(0.92); }
  70% { transform: rotateY(-10deg) scale(0.96); }
  100% { transform: rotateY(0deg) scale(1); }
}

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Front face */
.card-front {
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.card-front::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    ellipse at 30% 20%,
    rgba(159, 122, 202, 0.08) 0%,
    transparent 60%
  );
  pointer-events: none;
}

.card-kanji {
  font-family: var(--font-kanji);
  font-size: clamp(6rem, 18vw, 10rem);
  font-weight: 900;
  color: var(--text-light);
  text-shadow: 0 0 40px rgba(159, 122, 202, 0.3);
  z-index: 1;
  line-height: 1;
}

.card-hint {
  position: absolute;
  bottom: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.6;
  letter-spacing: 0.1em;
  font-family: var(--font-english);
}

/* Back face */
.card-back {
  background: var(--card-bg-back);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transform: rotateY(180deg);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  overflow-y: auto;
}

.card-back::-webkit-scrollbar {
  width: 4px;
}

.card-back::-webkit-scrollbar-thumb {
  background: var(--purple-light);
  border-radius: 2px;
}

.card-back-content {
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.back-top-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.back-kanji {
  font-family: var(--font-kanji);
  font-size: 3.2rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1;
  flex-shrink: 0;
}

.back-top-row .meanings-display {
  text-align: right;
  flex: 1;
}

.readings {
  display: flex;
  gap: 16px;
}

.reading-group {
  flex: 1;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}

.reading-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.reading-value {
  display: block;
  font-family: var(--font-kanji);
  font-size: 1.3rem;
  font-weight: 500;
  color: #ffffff;
}

.meanings-display {
  text-align: right;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--pink-accent);
  padding: 4px 0;
  font-family: var(--font-english);
}

.section-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  font-family: var(--font-english);
}

.examples-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.example-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 1.05rem;
  padding: 8px 12px;
  background: var(--glass);
  border-radius: 8px;
}

.example-word {
  font-family: var(--font-kanji);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-light);
  white-space: nowrap;
}

.example-reading {
  color: var(--purple-pale);
  font-family: var(--font-brush);
  font-size: 1.05rem;
  white-space: nowrap;
}

.example-meaning {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-left: auto;
  font-family: var(--font-body-english);
}

.radicals-display {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.radical-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  font-size: 0.95rem;
}

.radical-char {
  font-family: var(--font-kanji);
  font-size: 1.15rem;
  color: #ffffff;
}

.radical-name {
  font-family: var(--font-body-english);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============================================
   Answer Buttons
   ============================================ */

.answer-buttons {
  display: flex;
  gap: 16px;
  width: 100%;
  max-width: 420px;
}

.btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  border: none;
  border-radius: 14px;
  font-family: var(--font-english);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn:active {
  transform: scale(0.96);
}

.btn-icon {
  font-size: 2rem;
  font-weight: 700;
}

.btn-wrong {
  background: rgba(224, 122, 142, 0.2);
  color: var(--wrong-color);
  border: 1px solid rgba(224, 122, 142, 0.3);
}

.btn-wrong:hover {
  background: rgba(224, 122, 142, 0.3);
}

.btn-correct {
  background: rgba(126, 203, 161, 0.2);
  color: var(--correct-color);
  border: 1px solid rgba(126, 203, 161, 0.3);
}

.btn-correct:hover {
  background: rgba(126, 203, 161, 0.3);
}

/* Flash feedback */
.btn-wrong.flash {
  animation: flashWrong 0.4s ease;
}

.btn-correct.flash {
  animation: flashCorrect 0.4s ease;
}

@keyframes flashWrong {
  0%, 100% { background: rgba(224, 122, 142, 0.2); }
  50% { background: rgba(224, 122, 142, 0.5); }
}

@keyframes flashCorrect {
  0%, 100% { background: rgba(126, 203, 161, 0.2); }
  50% { background: rgba(126, 203, 161, 0.5); }
}

/* ============================================
   Navigation
   ============================================ */

.nav-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  padding: 14px 0;
  flex-shrink: 0;
}

.nav-btn {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  color: var(--purple-pale);
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-light);
}

.nav-btn:active {
  transform: scale(0.92);
}

.shuffle-btn {
  width: 44px;
  height: 44px;
}

/* ============================================
   Background toggle button (desktop only)
   ============================================ */
.bg-toggle-btn {
  position: fixed;
  bottom: 20px;
  left: 20px;
  z-index: 60;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(20, 10, 40, 0.6);
  color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  backdrop-filter: blur(8px);
}

.bg-toggle-btn:hover {
  background: rgba(40, 20, 70, 0.8);
  color: rgba(255, 255, 255, 0.85);
  border-color: rgba(255, 255, 255, 0.3);
}

.bg-toggle-btn.active {
  color: var(--pink-accent);
  border-color: rgba(224, 122, 142, 0.4);
}

/* Image background mode */
body.bg-image .bg-scene {
  background: url('bg-fuji.png') center center / cover no-repeat;
}

body.bg-image .bg-scene .bg-base,
body.bg-image .bg-scene .bg-blob,
body.bg-image .bg-scene .bg-grain {
  display: none;
}

/* Top UI overrides when image background is active */
body.bg-image .logo-jp {
  color: rgba(255, 255, 255, 0.92);
}

body.bg-image .logo-en {
  color: rgba(255, 255, 255, 0.85);
}

body.bg-image .progress-text {
  color: rgba(255, 255, 255, 0.7);
}

body.bg-image .filter-btn {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.22);
  color: rgba(255, 255, 255, 0.8);
}

body.bg-image .filter-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 1);
}

body.bg-image .filter-btn.active {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.65);
  color: rgba(255, 255, 255, 1);
}

body.bg-image .progress-bar-container {
  background: rgba(255, 255, 255, 0.15);
}

body.bg-image .card-front {
  background: rgba(30, 15, 55, 0.90);
}

body.bg-image .card-back {
  background: rgba(25, 12, 48, 0.93);
}

/* ============================================
   Responsive — Mobile
   ============================================ */

@media (max-width: 480px) {
  .app {
    padding: 10px 16px 0;
    gap: 10px;
  }

  .header {
    padding-bottom: 0;
  }

  /* Slightly larger header text on mobile */
  .logo-jp {
    font-size: 0.9rem;
  }

  .logo-en {
    font-size: 0.78rem;
  }

  .progress-bar-container {
    margin-bottom: 0;
  }

  /* Left-aligned, horizontally scrollable filter chips */
  .difficulty-filter {
    overflow-x: auto;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 8px;
    padding: 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    flex-shrink: 0;
  }

  .difficulty-filter::-webkit-scrollbar {
    display: none;
  }

  .filter-btn {
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 0.72rem;
    padding: 7px 13px;
  }

  /* Center card in space above fixed buttons */
  .card-area {
    flex: 1;
    justify-content: center;
    align-items: center;
    padding-bottom: 90px;
    gap: 0;
  }

  .card-container {
    max-height: 52vh;
    flex: none;
    width: 100%;
  }

  .card-kanji {
    font-size: clamp(5rem, 22vw, 8rem);
  }

  .card-back-content {
    padding: 14px 14px;
    gap: 8px;
  }

  .reading-group {
    padding: 8px;
  }

  .reading-value {
    font-size: 0.95rem;
  }

  .meanings-display {
    font-size: 1.05rem;
    padding: 2px 0;
  }

  /* Fix answer buttons to bottom of screen */
  .answer-buttons {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    gap: 10px;
    max-width: 100%;
    padding: 12px 16px 30px;
    background: linear-gradient(to top, rgba(20, 10, 40, 0.98) 70%, transparent);
    z-index: 50;
  }

  .btn {
    padding: 12px 16px;
    font-size: 0.9rem;
  }

  /* Hide nav arrows and bg toggle on mobile */
  .nav-controls,
  .bg-toggle-btn {
    display: none;
  }
}

/* Desktop large */
@media (min-width: 768px) {
  .card-container {
    max-height: 60vh;
  }
}

/* ============================================
   Animations
   ============================================ */

.card-container {
  animation: floatIn 0.6s ease-out;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Card slide transition — handled via Web Animations API in app.js */

/* ============================================
   Feedback Overlay — Cat + Text
   ============================================ */

.feedback-overlay {
  position: fixed;
  z-index: 100;
  top: 55%;
  left: 50%;
  transform: translate(-50%, -50%) translateY(40px) scale(0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transition: none;
}

.feedback-overlay.show {
  animation: feedbackPopup 1.4s ease forwards;
}

@keyframes feedbackPopup {
  0% { opacity: 0; transform: translate(-50%, -50%) translateY(40px) scale(0.5); }
  15% { opacity: 1; transform: translate(-50%, -50%) translateY(-10px) scale(1.1); }
  25% { transform: translate(-50%, -50%) translateY(0) scale(1); }
  75% { opacity: 1; transform: translate(-50%, -50%) translateY(0) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -50%) translateY(-20px) scale(0.8); }
}

.feedback-cat {
  width: 100px;
  height: 100px;
  filter: drop-shadow(0 4px 16px rgba(0, 0, 0, 0.35));
}

.feedback-cat svg {
  width: 100%;
  height: 100%;
}

.feedback-text {
  font-family: var(--font-kanji);
  font-size: 1.4rem;
  font-weight: 700;
  padding: 6px 20px;
  border-radius: 20px;
  white-space: nowrap;
  color: #fff;
  background: rgba(15, 15, 45, 0.85);
  border: 1px solid rgba(80, 80, 140, 0.5);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Cherry Blossom Rain
   ============================================ */

.cherry-blossom-container {
  position: fixed;
  inset: 0;
  z-index: 99;
  pointer-events: none;
  overflow: hidden;
}

.cherry-petal {
  position: absolute;
  top: -20px;
  width: 14px;
  height: 14px;
  opacity: 0;
  animation: petalFall linear forwards;
  background: radial-gradient(
    ellipse at 30% 30%,
    #ffc7d8 0%,
    #f9a8c0 40%,
    #f48bab 80%,
    #e87a9a 100%
  );
  border-radius: 50% 0 50% 50%;
  box-shadow: inset -1px -1px 2px rgba(200, 80, 120, 0.2), 0 1px 3px rgba(0, 0, 0, 0.1);
}

@keyframes petalFall {
  0% { opacity: 0; transform: translateX(0) rotate(0deg) scale(0.8); }
  8% { opacity: 0.9; }
  50% { opacity: 0.85; transform: translateX(calc(var(--drift) * 0.5)) rotate(calc(var(--spin) * 0.5)) scale(1); }
  90% { opacity: 0.6; }
  100% { opacity: 0; transform: translateX(var(--drift)) rotate(var(--spin)) scale(0.7); top: 105vh; }
}

/* ============================================
   Completion Screen
   ============================================ */

.completion-screen {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 5, 30, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

.completion-screen.show {
  opacity: 1;
  pointer-events: auto;
}

.completion-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
  position: relative;
  animation: completionSlideIn 0.8s ease-out;
}

@keyframes completionSlideIn {
  0% { opacity: 0; transform: translateY(30px) scale(0.9); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.completion-cat {
  width: 140px;
  height: 140px;
  filter: drop-shadow(0 6px 24px rgba(0, 0, 0, 0.4));
  animation: catDance 1.2s ease-in-out infinite;
}

.completion-cat svg {
  width: 100%;
  height: 100%;
}

@keyframes catDance {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  20% { transform: translateY(-12px) rotate(-5deg); }
  40% { transform: translateY(0) rotate(0deg); }
  60% { transform: translateY(-12px) rotate(5deg); }
  80% { transform: translateY(0) rotate(0deg); }
}

.completion-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--purple-pale);
  text-shadow: 0 0 30px rgba(159, 122, 202, 0.4);
  font-family: var(--font-english);
}

.completion-stats {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.completion-score {
  font-size: 1.6rem;
  font-weight: 600;
  color: #ffffff;
  font-family: var(--font-english);
}

.completion-percent {
  font-size: 1.6rem;
  font-weight: 600;
  color: #ffffff;
  font-family: var(--font-english);
}

.completion-ganbare {
  font-size: 1.1rem;
  font-weight: 400;
  color: #ffffff;
  font-family: var(--font-kanji);
  margin-top: 4px;
}

.completion-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 10px;
  width: 100%;
  max-width: 280px;
}

.completion-btn {
  padding: 14px 28px;
  border: none;
  border-radius: 14px;
  font-family: var(--font-english);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.02em;
}

.completion-btn:active {
  transform: scale(0.96);
}

.review-btn {
  background: rgba(224, 122, 142, 0.25);
  color: var(--wrong-color);
  border: 1px solid rgba(224, 122, 142, 0.4);
}

.review-btn:hover {
  background: rgba(224, 122, 142, 0.4);
}

.restart-btn {
  background: rgba(126, 203, 161, 0.25);
  color: var(--correct-color);
  border: 1px solid rgba(126, 203, 161, 0.4);
}

.restart-btn:hover {
  background: rgba(126, 203, 161, 0.4);
}

/* Continuous cherry blossoms on completion screen */
.completion-cherry {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: -1;
}