/* ===== style.css ===== */
/* === V2 Full Release === */
/* EyeTrack — light lavender theme (English UI; brain/ball visual separation) */

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: linear-gradient(180deg, #F5F0FF 0%, #EDE7F6 50%, #E1D5F5 100%);
  margin: 0;
  min-height: 100vh;
  font-family: 'Nunito', sans-serif;
  color: #3E1F6E;
  overflow: hidden;
}

/* ---------------- layout ---------------- */

#app {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Game board. The canvas clears TRANSPARENT every frame (CONFIG.GAME.
   transparentBg), so the container's light background and the ghost brain
   behind the canvas show through — the brain sits *on the board*, behind
   the balls, de-colored so it can never be mistaken for a purple ball. */
.game-container {
  position: relative;
  width: 400px;
  max-width: 100vw;
  margin: 0 auto;
  aspect-ratio: 5/7;
  border-radius: 20px;
  overflow: hidden;
  background: linear-gradient(180deg, #FDFBFF 0%, #F6F1FD 100%);
  box-shadow: 0 12px 48px rgba(100, 50, 180, 0.2);
}

/* Ghost brain: grayscale(1) strips ALL color (cold gray), brightness(1.3)
   lifts it toward the light board, blur(1px) softens edges, opacity 0.07
   keeps it a whisper. If assets/brain-bg.png is missing, nothing renders —
   no error, board stays clean. */
.game-container::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 90%;
  height: 90%;
  transform: translate(-50%, -50%);
  background: url('assets/brain-bg.png') center/contain no-repeat;
  filter: blur(1px) grayscale(1) brightness(1.3);
  opacity: 0.07;
  pointer-events: none;
  z-index: 0;
}

.game-container canvas {
  position: relative;
  z-index: 1;
}

#game-canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 20px;
  touch-action: none;
}

/* ---------------- HUD ---------------- */

/* === UI Safe Zone Fix === 外层容器：顶部 HUD 安全区 + 棋盘纵向布局。
   HUD 不再 absolute 叠进棋盘内部，彻底避免遮挡顶部小球。 */
#game-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* === UI Safe Zone Fix === 顶部 UI 安全区（贴视口顶部，棋盘在其下方居中） */
.top-ui {
  position: absolute;
  top: 10px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  z-index: 10;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 12px;
  padding: 8px 16px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  margin: 10px 16px 0;
}

/* === UI Safe Zone Fix === 徽章样式（timer-badge 预留：当前倒计时画在 canvas 内） */
.level-badge,
.timer-badge,
.accuracy-badge {
  font-family: 'Nunito', sans-serif;
  font-weight: bold;
  font-size: 16px;
  color: #5E3580;
  background: white;
  padding: 6px 12px;
  border-radius: 20px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

/* === UI Safe Zone Fix === 棋盘在安全区下方：留出顶部 40px，
   高度封顶 70vh（配合 aspect-ratio 5/7 用 width 反推），保证永不顶到 HUD。 */
#game-container .game-container {
  z-index: 1;
  margin: 40px auto 0;
  width: min(400px, 95vw, calc(70vh * 5 / 7));
}

.pill {
  background: rgba(255, 255, 255, 0.85);
  color: #4A148C;
  border: 1px solid #E1D5F5;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 700;
}

/* 改动 4：HUD 文字深色化（浅色背景下清晰可读） */
.hud-level,
.hud-accuracy {
  color: #3E1F6D;
  background: rgba(255, 255, 255, 0.85);
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 2px 8px rgba(100, 50, 180, 0.15);
}

/* ---------------- screens ---------------- */

.screen {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  background: linear-gradient(180deg, #F5F0FF 0%, #EDE7F6 50%, #E1D5F5 100%);
}

#screen-gameover {
  background: rgba(245, 240, 255, 0.92);  /* 浅紫半透明遮罩 */
  backdrop-filter: blur(8px);
}

#screen-transition {
  z-index: 20;
  background: rgba(74, 20, 140, 0.45);
}

/* 改动 5：Game Over 弹窗（浅色主题） */
#screen-gameover .modal-card {
  background: #FFFFFF;
  border: 2px solid #C8A2E8;
  border-radius: 24px;
  padding: 32px;
  text-align: center;
  box-shadow: 0 16px 64px rgba(100, 50, 180, 0.25);
  max-width: 360px;
  width: 90%;
}

#screen-gameover h2 {
  color: #4A148C;
  font-family: 'Fredoka One', sans-serif;
  font-size: 28px;
  margin: 0 0 12px 0;
}

#screen-gameover p {
  color: #6A1B9A;
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  margin: 6px 0;
}

/* ---------------- typography ---------------- */

/* === V2 Full Release === shorter English title gets a touch more size
   and letter-spacing so the start screen stays visually full. */
.title {
  color: #4A148C;
  font-family: 'Fredoka One', sans-serif;
  font-size: 46px;
  letter-spacing: 1px;
  text-align: center;
  text-shadow: 0 2px 8px rgba(156, 39, 176, 0.2);
  margin: 0 0 16px;
}

.subtitle {
  color: #6A1B9A;
  font-size: 16px;
  text-align: center;
  max-width: 340px;
  line-height: 1.5;
  margin: 0 0 32px;
}

/* === Brain Boost Text === 三按钮容器（间距由 gap 控制） */
.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  margin: 16px 0 4px;
}

/* .btn 自带 margin:8px，在 gap 容器内清零，避免间距叠加成 26px */
.menu-buttons .btn {
  margin: 0;
}

/* === Brain Boost Text === Version A 科学感益智文案卡片 */
.brain-boost-text {
  color: #5E3580;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
  max-width: 340px;
  margin: 16px auto 8px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 12px;
  border-left: 3px solid #9C27B0;
  border-right: 3px solid #9C27B0;
}

/* === Practice Mode + Unified Wallbounce === best-line 兼容新 .best-score(span) 结构 */
.best-line,
.best-score {
  margin-top: 28px;
  font-size: 14px;
  color: rgba(106, 27, 154, 0.6);
}

.transition-title {
  font-family: 'Fredoka One', cursive;
  font-size: 48px;
  color: #E1D5F5;
  text-shadow: 0 0 24px rgba(179, 136, 255, 0.8);
}

.transition-sub {
  margin-top: 8px;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
}

/* ---------------- buttons ---------------- */

/* Shared shape; color comes from .btn-primary / .btn-secondary. */
.btn {
  display: block;
  margin: 8px;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform 0.2s;
}

.btn:hover {
  transform: scale(1.05);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #9C27B0, #C8A2E8);
  color: #fff;
  border: none;
  padding: 14px 28px;
  border-radius: 50px;
  font-family: 'Fredoka One', sans-serif;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(156, 39, 176, 0.35);
  transition: transform 0.2s;
}

.btn-primary:hover {
  transform: scale(1.05);
}

/* === Practice Mode + Unified Wallbounce === 练习/每日按钮（主推闯关为 .btn-primary） */
.btn-secondary {
  background: #fff;
  color: #6A1B9A;
  border: 2px solid #C8A2E8;
  padding: 12px 24px;
  border-radius: 50px;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
}

/* ---------------- game over card ---------------- */

.card {
  background: #ffffff;
  color: #3E1F6E;
  border-radius: 20px;
  padding: 32px;
  text-align: center;
  width: 100%;
  max-width: 340px;
  box-shadow: 0 20px 60px rgba(100, 50, 180, 0.25);
  /* Tall content (preview + buttons) must stay reachable on short screens */
  max-height: 92vh;
  overflow-y: auto;
}

.card h2 {
  font-family: 'Fredoka One', cursive;
  font-size: 32px;
  color: #4A148C;
  margin: 0 0 12px;
}

.card p {
  margin: 6px 0;
  font-size: 16px;
}

.card .btn {
  width: 100%;
  margin: 8px 0 0;
}

.daily-note {
  color: #9C27B0;
  font-weight: 700;
}

/* ---------------- result card preview & share row ---------------- */

#result-card-preview {
  width: 220px;
  height: 390px;
  border: 2px solid #C8A2E8;
  border-radius: 16px;
  background: #F5F0FF;
  margin: 16px auto;
  display: block;
}

.share-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 12px;
}

.share-buttons button {
  padding: 10px 18px;
  font-size: 14px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  transition: transform 0.2s;
}

.share-buttons button:hover {
  transform: scale(1.05);
}

#btn-save-image {
  background: #9C27B0;
  color: #fff;
}

#btn-copy-link {
  background: #FFD54F;
  color: #1a1a2e;
}

#btn-native-share {
  background: #66BB6A;
  color: #fff;
}

/* ---------------- practice difficulty modal (=== Practice Difficulty Select ===) ---------------- */

#practice-modal {
  position: fixed;
  inset: 0;
  background: rgba(245, 240, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1200;
}
#practice-modal.hidden {
  display: none !important;
}

.practice-desc {
  color: #6A1B9A;
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  margin-bottom: 16px;
}

.btn-diff {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  margin-bottom: 10px;
  border-radius: 14px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  text-align: left;
}
.btn-diff:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-easy   { background: #E8F5E9; border-color: #81C784; }
.btn-medium { background: #FFF8E1; border-color: #FFB74D; }
.btn-hard   { background: #FCE4EC; border-color: #E57373; }

.diff-emoji { font-size: 22px; }
.diff-name {
  font-family: 'Fredoka One', sans-serif;
  font-size: 16px;
  color: #4A148C;
  flex-shrink: 0;
  width: 70px;
}
.diff-desc {
  font-family: 'Nunito', sans-serif;
  font-size: 12px;
  color: #6A1B9A;
}

.btn-text {
  background: none;
  border: none;
  color: #9C27B0;
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 8px;
  padding: 6px 12px;
}

/* === Share Targets V2 === Game Over 弹窗社交分享按钮组 */
.share-row {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: 10px 0 4px;
}
.btn-share {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid #E0E0E0;
  background: #FFF;
  font-size: 18px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-share:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}
.btn-share-x { color: #000; border-color: #000; }
.btn-share-reddit { color: #FF4500; border-color: #FF4500; }
.btn-share-whatsapp { color: #25D366; border-color: #25D366; }
.btn-share-facebook { color: #1877F2; border-color: #1877F2; }

.share-row-secondary {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 8px;
}
.btn-text-sm {
  background: none;
  border: none;
  color: #9C27B0;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
  padding: 4px 8px;
}

/* === Back to Menu === 游戏内左上角返回按钮（.top-ui 为 pointer-events:none，按钮需重新开启交互） */
.hud-left { display: flex; align-items: center; gap: 8px; }
.btn-back {
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: #5E3580;
  background: #fff;
  border: none;
  border-radius: 20px;
  padding: 6px 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  cursor: pointer;
  pointer-events: auto;
}
.btn-back:hover { background: #F3E9FB; }

/* ---------------- utils ---------------- */

.hidden {
  display: none !important;
}

/* ---------------- mobile ---------------- */

@media (max-width: 480px) {
  .game-container {
    width: 100vw;
    border-radius: 0;
  }

  #game-canvas {
    border-radius: 0;
  }

  .title {
    font-size: 30px;
  }

  .btn-primary {
    font-size: 16px;
    padding: 12px 22px;
  }

  .card {
    padding: 24px;
  }
}

/* ===================== Onboarding + Rotate Warning ===================== */
/* === Onboarding + Rotate Warning === 横屏提示条 + 首次引导页 */

/* 横屏提示条 */
#rotate-warning {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: #4A148C;
  color: #fff;
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  padding: 10px 16px;
  z-index: 2000;
  animation: slideDown 0.3s ease-out;
}

#rotate-warning.hidden {
  display: none !important;
}

@keyframes slideDown {
  from { transform: translateY(-100%); }
  to   { transform: translateY(0); }
}

/* 竖屏时显示（横屏隐藏） */
@media (orientation: landscape) {
  #rotate-warning {
    display: none !important;
  }
}

/* 首次引导页 */
#onboarding-overlay {
  position: fixed;
  inset: 0;
  background: rgba(245, 240, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1500;
}

#onboarding-overlay.hidden {
  display: none !important;
}

.onboarding-card {
  background: #fff;
  border: 2px solid #C8A2E8;
  border-radius: 28px;
  padding: 36px 28px 28px;
  text-align: center;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 20px 80px rgba(100, 50, 180, 0.3);
  animation: onboardingPop 0.4s ease-out;
}

@keyframes onboardingPop {
  from { transform: scale(0.9); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.onboarding-icon {
  font-size: 44px;
  margin-bottom: 4px;
}

.onboarding-title {
  color: #4A148C;
  font-family: 'Fredoka One', sans-serif;
  font-size: 28px;
  margin: 0 0 20px 0;
}

.onboarding-tips {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.tip {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #F5F0FF;
  padding: 10px 14px;
  border-radius: 12px;
  text-align: left;
}

.tip-icon {
  font-size: 20px;
  flex-shrink: 0;
}

.tip-text {
  color: #3E1F6D;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 700;
}

.onboarding-landscape {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 8px 12px;
  background: #FFF3E0;
  border-radius: 10px;
}

.landscape-icon {
  font-size: 18px;
}

.landscape-text {
  color: #E65100;
  font-family: 'Nunito', sans-serif;
  font-size: 13px;
  font-weight: 700;
}

#btn-onboarding-start {
  width: 100%;
  margin-bottom: 10px;
}

#btn-onboarding-replay {
  width: 100%;
  background: none;
  border: 2px dashed #C8A2E8;
  color: #9C27B0;
}

/* ===================== Tutorial（首次游玩教程） ===================== */
/* === Anti-Crowd + Tutorial Choice === 全屏半透明遮罩 + 结束双按钮 */

#tutorial-overlay {
  position: fixed;
  inset: 0;
  z-index: 1600; /* === Onboarding + Rotate Warning === 高于引导页 1500，从引导页点「看演示」时盖在其上 */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(74, 20, 140, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

#tutorial-overlay.hidden {
  display: none;
}

.tutorial-card {
  position: relative;
  width: min(92vw, 360px);
  background: #FFFFFF;
  border: 2px solid #C8A2E8;
  border-radius: 24px;
  padding: 26px 22px 20px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(100, 50, 180, 0.30);
  animation: tutorialPop 0.4s ease;
}

@keyframes tutorialPop {
  from { transform: scale(0.82); opacity: 0; }
  to   { transform: scale(1);    opacity: 1; }
}

/* 右上角关闭按钮 ✕ */
#btn-tutorial-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: #F0E6FB;
  color: #6A1B9A;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
#btn-tutorial-close:hover { background: #E3D2F5; }
#btn-tutorial-close:active { transform: scale(0.94); }

.tutorial-icon {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 8px;
}

.tutorial-title {
  font-family: 'Fredoka One', sans-serif;
  font-size: 22px;
  color: #4A148C;
  margin: 0 0 14px;
}

.tutorial-demo {
  width: 100%;
  max-width: 280px;
  margin: 0 auto 14px;
}

#tutorial-canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  background: #1a1530;
  box-shadow: inset 0 0 0 2px rgba(156, 39, 176, 0.20);
}

.tutorial-text {
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: #4A148C;
  margin: 0 0 16px;
  min-height: 46px;
}

.tutorial-dots {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 16px;
}

.tutorial-dots .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #E1D5F5;
  transition: background 0.3s ease, transform 0.3s ease;
}

.tutorial-dots .dot.active {
  background: #9C27B0;
  transform: scale(1.3);
}

/* 动画结束后的操作按钮（再看一遍 / 开始游戏） */
#tutorial-actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  justify-content: center;
}

#tutorial-actions.hidden {
  display: none;
}

#tutorial-actions .btn-secondary,
#tutorial-actions .btn-primary {
  margin: 0;
  font-size: 15px;
  padding: 11px 18px;
}

/* 开始界面右上角的「如何游玩」帮助按钮 */
.btn-help {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
  color: #6A1B9A;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(100, 50, 180, 0.20);
  transition: transform 0.2s ease, background 0.2s ease;
}
.btn-help:hover { transform: scale(1.08); background: #fff; }
.btn-help:active { transform: scale(0.96); }