/* ============================================
   漢字チャレンジGO - スタイルシート
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700;900&family=Zen+Maru+Gothic:wght@400;700;900&display=swap');

/* ---- CSS Variables ---- */
:root {
  --bg-gradient-start: #0f0c29;
  --bg-gradient-mid: #302b63;
  --bg-gradient-end: #24243e;
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.15);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);
  --text-primary: #f0e6ff;
  --text-secondary: #b8a9d4;
  --accent-gold: #ffd700;
  --accent-pink: #ff6b9d;
  --accent-blue: #4fc3f7;
  --correct-color: #00e676;
  --incorrect-color: #ff5252;
  --btn-gradient-start: #667eea;
  --btn-gradient-end: #764ba2;
  --btn-hover-start: #7c94f8;
  --btn-hover-end: #8e5fbf;
  --font-main: 'Noto Sans JP', 'Zen Maru Gothic', sans-serif;
  --font-kanji: 'Zen Maru Gothic', 'Noto Sans JP', serif;
}

/* ---- Reset & Base ---- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-mid), var(--bg-gradient-end));
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
}

/* ---- Animated Background Particles ---- */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(2px 2px at 20% 30%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(2px 2px at 40% 70%, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(3px 3px at 60% 20%, rgba(255, 255, 255, 0.25), transparent),
    radial-gradient(2px 2px at 80% 50%, rgba(255, 255, 255, 0.15), transparent),
    radial-gradient(2px 2px at 10% 80%, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(3px 3px at 90% 10%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(2px 2px at 50% 90%, rgba(255, 255, 255, 0.15), transparent),
    radial-gradient(2px 2px at 30% 50%, rgba(255, 255, 255, 0.2), transparent);
  animation: twinkle 8s ease-in-out infinite alternate;
  z-index: 0;
  pointer-events: none;
}

@keyframes twinkle {
  0% {
    opacity: 0.5;
  }

  50% {
    opacity: 1;
  }

  100% {
    opacity: 0.6;
  }
}

/* ---- Game Container ---- */
#game-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 600px;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

/* ---- Screen (common) ---- */
.screen {
  display: none;
  width: 100%;
  text-align: center;
  animation: fadeIn 0.5s ease-out;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- Glass Card ---- */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  box-shadow: var(--card-shadow);
  padding: 40px 30px;
}

.relative-container {
  position: relative;
}

/* ---- Icon Buttons ---- */
.icon-btn {
  background: transparent;
  border: none;
  font-size: 1.8rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: transform 0.3s ease, filter 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px;
  border-radius: 50%;
}

.icon-btn:hover {
  transform: rotate(30deg) scale(1.1);
  filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.4));
  background: rgba(255, 255, 255, 0.1);
}

.settings-btn {
  position: absolute;
  top: 15px;
  right: 15px;
  z-index: 10;
}

/* ---- Title Screen ---- */
#title-screen .title-logo {
  font-family: var(--font-kanji);
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-pink), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  letter-spacing: 4px;
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {

  0%,
  100% {
    filter: brightness(1);
  }

  50% {
    filter: brightness(1.3);
  }
}

#title-screen .title-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  letter-spacing: 2px;
}

#title-screen .title-icon {
  font-size: 4rem;
  margin-bottom: 20px;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 14px 48px;
  border: none;
  border-radius: 50px;
  font-family: var(--font-main);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  letter-spacing: 1px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--btn-gradient-start), var(--btn-gradient-end));
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--btn-hover-start), var(--btn-hover-end));
  box-shadow: 0 6px 25px rgba(102, 126, 234, 0.6);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::after {
  width: 300px;
  height: 300px;
}

/* ---- Level Select Screen ---- */
#level-screen .level-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 30px;
  color: var(--text-primary);
}

.level-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.level-btn {
  padding: 18px 24px;
  border: 1px solid var(--card-border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 14px;
}

.level-btn .level-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.level-btn .level-info {
  display: flex;
  flex-direction: column;
}

.level-btn .level-name {
  font-size: 1.15rem;
}

.level-btn .level-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-top: 2px;
}

.level-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateX(6px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.level-btn:active {
  transform: translateX(3px);
}

/* Level color accents */
.level-btn[data-level="1級"] {
  border-left: 4px solid #ff5252;
}

.level-btn[data-level="準1級"] {
  border-left: 4px solid #ab47bc;
}

.level-btn[data-level="2級"] {
  border-left: 4px solid #ff9800;
}

.level-btn[data-level="準2級"] {
  border-left: 4px solid #4fc3f7;
}

.level-btn[data-level="3級"] {
  border-left: 4px solid #66bb6a;
}

.level-btn[data-level="1級"]:hover {
  border-left-color: #ff8a80;
}

.level-btn[data-level="準1級"]:hover {
  border-left-color: #ce93d8;
}

.level-btn[data-level="2級"]:hover {
  border-left-color: #ffb74d;
}

.level-btn[data-level="準2級"]:hover {
  border-left-color: #81d4fa;
}

.level-btn[data-level="3級"]:hover {
  border-left-color: #a5d6a7;
}

/* Settings active state */
.time-btn.active-setting {
  border-color: var(--accent-gold);
  background: rgba(255, 215, 0, 0.15);
  box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
}

.time-btn.active-setting::after {
  content: "✓";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--accent-gold);
  font-weight: 900;
}

/* ---- Game Screen ---- */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
  gap: 8px;
}

.game-header .level-badge {
  background: rgba(255, 255, 255, 0.1);
  padding: 4px 14px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.85rem;
}

.game-header .score-display {
  font-weight: 700;
  color: var(--accent-gold);
  font-size: 1rem;
}

.lives-display {
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 10px;
  letter-spacing: 4px;
  transition: transform 0.3s ease;
}

.lives-display.shake {
  animation: shake 0.5s ease;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  20% {
    transform: translateX(-8px);
  }

  40% {
    transform: translateX(8px);
  }

  60% {
    transform: translateX(-6px);
  }

  80% {
    transform: translateX(6px);
  }
}

/* Streak & Question Count */
.game-info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.streak-display {
  color: var(--accent-pink);
  font-weight: 700;
}

.streak-display.active {
  animation: pulse 0.6s ease;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.3);
  }

  100% {
    transform: scale(1);
  }
}

/* Timer Display */
.timer-text {
  text-align: center;
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--correct-color);
  margin-bottom: 4px;
  transition: color 0.3s ease;
}

.timer-text.warning {
  color: var(--accent-gold);
}

.timer-text.danger {
  color: var(--incorrect-color);
}

.timer-container {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  margin-bottom: 20px;
  overflow: hidden;
}

.timer-bar {
  height: 100%;
  width: 100%;
  background: var(--correct-color);
  border-radius: 4px;
  transition: width 0.1s linear, background-color 0.3s ease;
}

.timer-bar.warning {
  background: var(--accent-gold);
}

.timer-bar.danger {
  background: var(--incorrect-color);
  box-shadow: 0 0 10px rgba(255, 82, 82, 0.5);
}

/* Kanji Display Area */
.kanji-area {
  padding: 30px 10px;
  margin-bottom: 24px;
  position: relative;
}

.kanji-text {
  font-family: var(--font-kanji);
  font-size: 4rem;
  font-weight: 900;
  color: #fff;
  text-shadow: 0 0 30px rgba(255, 255, 255, 0.15);
  transition: all 0.3s ease;
  line-height: 1.3;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.kanji-text.correct-flash {
  animation: correctFlash 0.6s ease;
}

.kanji-text.incorrect-flash {
  animation: incorrectFlash 0.6s ease;
}

@keyframes correctFlash {
  0% {
    color: #fff;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.15);
  }

  50% {
    color: var(--correct-color);
    text-shadow: 0 0 40px rgba(0, 230, 118, 0.5);
  }

  100% {
    color: #fff;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.15);
  }
}

@keyframes incorrectFlash {
  0% {
    color: #fff;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.15);
  }

  50% {
    color: var(--incorrect-color);
    text-shadow: 0 0 40px rgba(255, 82, 82, 0.5);
  }

  100% {
    color: #fff;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.15);
  }
}

/* Input Area */
.input-area {
  display: flex;
  gap: 10px;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
}

#answer-input,
#test-input {
  flex: 1;
  max-width: 300px;
  padding: 14px 20px;
  border: 2px solid var(--card-border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1.2rem;
  text-align: center;
  outline: none;
  transition: all 0.3s ease;
}

#answer-input:focus,
#test-input:focus {
  border-color: var(--btn-gradient-start);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
  background: rgba(255, 255, 255, 0.1);
}

#answer-input::placeholder,
#test-input::placeholder {
  color: rgba(255, 255, 255, 0.3);
  font-size: 0.95rem;
}

#submit-btn {
  padding: 14px 28px;
  flex-shrink: 0;
}

/* Feedback Message */
.feedback {
  min-height: 60px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin-top: 10px;
}

.feedback-message {
  font-size: 1.1rem;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: 12px;
  animation: fadeIn 0.3s ease;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feedback-message.show {
  opacity: 1;
}

.feedback-message.correct {
  color: var(--correct-color);
  background: rgba(0, 230, 118, 0.1);
  border: 1px solid rgba(0, 230, 118, 0.3);
}

.feedback-message.incorrect {
  color: var(--incorrect-color);
  background: rgba(255, 82, 82, 0.1);
  border: 1px solid rgba(255, 82, 82, 0.3);
}

/* ---- Game Over / Clear Screen ---- */
#gameover-screen .gameover-icon,
#clear-screen .clear-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

#gameover-screen .gameover-title {
  font-family: var(--font-kanji);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--incorrect-color);
  margin-bottom: 8px;
  letter-spacing: 4px;
}

#clear-screen .clear-title {
  font-family: var(--font-kanji);
  font-size: 2.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  letter-spacing: 4px;
}

.result-stats {
  margin: 24px 0;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 1rem;
}

.stat-row:last-child {
  border-bottom: none;
}

.stat-label {
  color: var(--text-secondary);
}

.stat-value {
  font-weight: 700;
  color: var(--accent-gold);
  font-size: 1.2rem;
}

.stat-value.highscore {
  color: var(--accent-pink);
}

.highscore-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-pink));
  color: #1a1a2e;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 900;
  margin-top: 10px;
  animation: pulse 1.5s infinite;
}

.result-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 30px;
}

.result-buttons .btn {
  width: 100%;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--card-border);
  box-shadow: none;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

/* ---- Responsive ---- */
@media (max-width: 480px) {
  .glass-card {
    padding: 28px 18px;
    border-radius: 18px;
  }

  #title-screen .title-logo {
    font-size: 2.2rem;
    letter-spacing: 2px;
  }

  .kanji-text {
    font-size: 3rem;
  }

  .input-area {
    flex-direction: column;
  }

  #answer-input,
  #test-input {
    max-width: 100%;
    width: 100%;
  }

  #submit-btn {
    width: 100%;
  }

  .game-header {
    font-size: 0.8rem;
  }

  .lives-display {
    font-size: 1.3rem;
  }

  .level-btn {
    padding: 14px 18px;
  }
}

@media (max-width: 360px) {
  #title-screen .title-logo {
    font-size: 1.8rem;
  }

  .kanji-text {
    font-size: 2.5rem;
  }
}

/* ---- Utility ---- */
.hidden {
  display: none !important;
}

/* Retire button */
.retire-area {
  margin-top: 20px;
}

.btn-retire {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 8px 24px;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.btn-retire:hover {
  opacity: 1;
  background: rgba(255, 82, 82, 0.15);
  border-color: rgba(255, 82, 82, 0.4);
  color: var(--incorrect-color);
}

/* Screen transition overlay */
.screen-flash {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
  opacity: 0;
}

.screen-flash.correct-bg {
  background: radial-gradient(circle, rgba(0, 230, 118, 0.3), transparent 70%);
  animation: flashBg 0.5s ease;
}

.screen-flash.incorrect-bg {
  background: radial-gradient(circle, rgba(255, 82, 82, 0.3), transparent 70%);
  animation: flashBg 0.5s ease;
}

@keyframes flashBg {
  0% {
    opacity: 0;
  }

  30% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}