/* ==========================================================================
   SYSTEM VARIABLES & FONTS (HỆ THỐNG BIẾN & FONT CHỮ CỔ PHONG)
   ========================================================================== */
:root {
  color-scheme: light dark;
  /* --- ☯️ MÀU CHÍNH ĐẠO (TIÊN ĐẠO - THANH TỊNH) --- */
  --tien-bg: #F4F1EA;            /* Giấy Tuyên Cổ / Mây Sương */
  --tien-board-bg: #E3DCCB;      /* Nền Bàn Cờ Đá Cổ */
  --tien-grid-cell: #D5CBB5;     /* Ô trống bàn cờ Tiên */
  --tien-primary: #2A6B5C;       /* Xanh Bích Ngọc (Linh Khí) */
  --tien-gold: #D4AF37;          /* Vàng Hoàng Kim (Đột Phá / Viền Cổ) */
  --tien-gold-glow: rgba(212, 175, 55, 0.4);
  --tien-text-dark: #1A1A1A;     /* Đen Mực Tàu */
  --tien-text-light: #F4F1EA;    /* Chữ sáng trên nền tối */

  /* --- 🐉 MÀU TÀ ĐẠO (YÊU ĐẠO - MA MỊ) --- */
  --yeu-bg: #0F0D13;             /* Đen Huyết Tế / U Tối */
  --yeu-board-bg: #1C1824;       /* Nền Bàn Cờ Ma Khí */
  --yeu-grid-cell: #2A2436;      /* Ô trống bàn cờ Yêu */
  --yeu-primary: #8B0000;        /* Đỏ Huyết Tế */
  --yeu-purple: #4B0082;         /* Tím Tà Khí / Tâm Ma */
  --yeu-accent: #c0392b;         /* Đỏ Son Ma Đạo Cổ Phong (thay neon) */
  --yeu-accent-dim: #922b21;     /* Đỏ Son trầm (hover) */
  --yeu-gold: #c9a84c;           /* Vàng Kim Cổ Kính (Yêu Vương) */
  --yeu-purple-glow: rgba(139, 0, 0, 0.6);
  --yeu-accent-glow: rgba(192, 57, 43, 0.55);
  --yeu-text-light: #E0E0E0;     /* Xám Bạc */

  /* --- ⛩️ CẤU HÌNH PHIÊN BẢN CHUNG --- */
  --border-gold: 2px solid #D4AF37;
  --font-title: 'Ma Shan Zheng', cursive, "Noto Serif SC", "Noto Serif TC", serif;
  --font-body: 'Noto Serif SC', 'Noto Serif TC', Georgia, serif;
}

/* ==========================================================================
   BASE & LAYOUT STYLES (BỐ CỤC NỀN TẢNG)
   ========================================================================== */
html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: 18px;
  overflow-x: hidden;
}

body {
  margin: 40px 0;
  transition: background 0.8s ease, color 0.8s ease;
}

/* Hiệu ứng chuyển động mây khói cổ phong (Drifting Clouds Layer) */
body::before {
  content: "";
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  pointer-events: none;
  z-index: -1;
  opacity: 0.15;
  animation: driftClouds 45s linear infinite;
  transition: background 0.8s ease, opacity 0.8s ease;
}

body.theme-tien {
  background: radial-gradient(circle, var(--tien-bg) 0%, var(--tien-board-bg) 80%) !important;
  color: var(--tien-text-dark);
}
body.theme-tien::before {
  background: radial-gradient(ellipse at 30% 30%, rgba(255, 255, 255, 0.8) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(255, 255, 255, 0.6) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 10%, rgba(255, 255, 255, 0.7) 0%, transparent 40%);
  opacity: 0.18;
}

body.theme-yeu {
  background: radial-gradient(circle, var(--yeu-bg) 0%, #050305 80%) !important;
  color: var(--yeu-text-light);
}
body.theme-yeu::before {
  background: radial-gradient(ellipse at 30% 30%, rgba(180, 30, 30, 0.3) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(90, 15, 120, 0.25) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 10%, rgba(140, 10, 10, 0.18) 0%, transparent 40%);
  opacity: 0.35;
}

.container {
  width: 500px;
  margin: 0 auto;
}

/* ==========================================================================
   HEADING & HEADER (TIÊU ĐỀ & ĐIỂM SỐ)
   ========================================================================== */
.heading:after {
  content: "";
  display: block;
  clear: both;
}

h1.title {
  font-family: var(--font-title);
  font-size: 56px;
  font-weight: bold;
  margin: 0;
  display: block;
  float: left;
  line-height: 1;
}

body.theme-tien h1.title {
  color: var(--tien-primary);
  text-shadow: 1px 1px 0px var(--tien-gold);
}

body.theme-yeu h1.title {
  color: var(--yeu-accent);
  text-shadow: 0 0 18px rgba(192, 57, 43, 0.9), 0 2px 4px rgba(0,0,0,0.8);
}

.scores-container {
  float: right;
  text-align: right;
}

.score-container, .best-container, .max-tile-container {
  position: relative;
  display: inline-block;
  padding: 12px 20px;
  font-size: 22px;
  font-weight: bold;
  border-radius: 4px;
  margin-top: 5px;
  text-align: center;
  min-width: 65px;
  font-family: var(--font-title);
  border: 1px solid transparent;
  transition: background-color 0.8s ease, border-color 0.8s ease;
  vertical-align: top;
  box-sizing: border-box;
  height: 48px;
}

.max-tile-container {
  padding: 18px 10px 6px 10px;
  font-size: 13px;
  min-width: 95px;
}

.score-container:after, .best-container:after, .max-tile-container:after {
  position: absolute;
  width: 100%;
  top: 4px;
  left: 0;
  text-transform: uppercase;
  font-size: 10px;
  line-height: 10px;
  text-align: center;
  font-family: var(--font-body);
  font-weight: normal;
  letter-spacing: 1px;
}

.score-container:after { content: "Tu Vi"; }
.best-container:after { content: "Kỷ Lục"; }
.max-tile-container:after { content: "Cảnh Giới"; }

body.theme-tien .score-container,
body.theme-tien .best-container,
body.theme-tien .max-tile-container {
  background: var(--tien-primary) !important;
  color: var(--tien-text-light) !important;
  border-color: var(--tien-gold);
  box-shadow: 0 3px 6px var(--tien-gold-glow);
}
body.theme-tien .score-container:after,
body.theme-tien .best-container:after,
body.theme-tien .max-tile-container:after {
  color: rgba(244, 241, 234, 0.7);
}

body.theme-yeu .score-container,
body.theme-yeu .best-container,
body.theme-yeu .max-tile-container {
  background: var(--yeu-board-bg) !important;
  color: var(--yeu-text-light) !important;
  border-color: var(--yeu-accent);
  box-shadow: 0 0 10px var(--yeu-accent-glow);
}
body.theme-yeu .score-container:after,
body.theme-yeu .best-container:after,
body.theme-yeu .max-tile-container:after {
  color: rgba(224, 224, 224, 0.6);
}

/* Điểm cộng bay lên (Score addition animation) */
@keyframes move-up {
  0% { top: 25px; opacity: 1; }
  100% { top: -50px; opacity: 0; }
}

.score-container .score-addition, .best-container .score-addition {
  position: absolute;
  right: 15px;
  font-size: 20px;
  font-weight: bold;
  z-index: 100;
  animation: move-up 800ms ease-out both;
}

body.theme-tien .score-container .score-addition { color: #f1c40f !important; text-shadow: 0 0 5px rgba(241, 196, 15, 0.6); }
body.theme-yeu .score-container .score-addition { color: #ff3b30 !important; text-shadow: 0 0 6px rgba(255, 59, 48, 0.8); }

.game-intro {
  margin: 10px 0;
  line-height: 1.5;
  font-size: 15px;
}

body.theme-tien .game-intro { color: #4a5d53; }
body.theme-yeu .game-intro { color: #8e83a0; }

/* ==========================================================================
   BUTTONS STYLING (NÚT BẤM PHÙ HIỆU)
   ========================================================================== */
.restart-button, .keep-playing-button, .retry-button, .theme-btn {
  display: inline-block;
  padding: 8px 18px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-title);
  font-size: 16px;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  border: 1px solid transparent;
}

.restart-button:hover, .keep-playing-button:hover, .retry-button:hover, .theme-btn:hover {
  transform: translateY(-2px);
}

.restart-button:active, .keep-playing-button:active, .retry-button:active, .theme-btn:active {
  transform: scale(0.96);
}

body.theme-tien .restart-button,
body.theme-tien .keep-playing-button,
body.theme-tien .retry-button,
body.theme-tien .theme-btn {
  background: var(--tien-primary) !important;
  color: var(--tien-text-light) !important;
  border-color: var(--tien-gold);
  box-shadow: 0 4px 6px rgba(42, 107, 92, 0.2);
}
body.theme-tien .restart-button:hover,
body.theme-tien .keep-playing-button:hover,
body.theme-tien .retry-button:hover,
body.theme-tien .theme-btn:hover {
  box-shadow: 0 6px 12px var(--tien-gold-glow);
}

body.theme-yeu .restart-button,
body.theme-yeu .keep-playing-button,
body.theme-yeu .retry-button,
body.theme-yeu .theme-btn {
  background: var(--yeu-board-bg) !important;
  color: var(--yeu-accent) !important;
  border-color: var(--yeu-accent);
  box-shadow: 0 0 8px var(--yeu-accent-glow);
}
body.theme-yeu .restart-button:hover,
body.theme-yeu .keep-playing-button:hover,
body.theme-yeu .retry-button:hover,
body.theme-yeu .theme-btn:hover {
  background: var(--yeu-accent) !important;
  color: #ffffff !important;
  box-shadow: 0 0 14px var(--yeu-accent-glow);
}

/* ==========================================================================
   GAME BOARD & CELLS (BÀN CỜ ĐÁ CỔ)
   ========================================================================== */
.game-container {
  margin-top: 25px;
  position: relative;
  padding: 15px;
  cursor: default;
  touch-action: none;
  border-radius: 4px;
  width: 500px;
  height: 500px;
  box-sizing: border-box;
  transition: all 0.8s ease;
}

body.theme-tien .game-container {
  background: var(--tien-board-bg) !important;
  border: 3px double var(--tien-gold);
  box-shadow: 0 8px 30px rgba(27, 61, 47, 0.15);
}

body.theme-yeu .game-container {
  background: var(--yeu-board-bg) !important;
  border: 3px double var(--yeu-primary);
  box-shadow: 0 8px 35px rgba(75, 0, 130, 0.35);
}

.grid-container {
  position: absolute;
  z-index: 1;
}

.grid-row {
  margin-bottom: 15px;
}
.grid-row:last-child {
  margin-bottom: 0;
}
.grid-row:after {
  content: "";
  display: block;
  clear: both;
}

.grid-cell {
  width: 106.25px;
  height: 106.25px;
  margin-right: 15px;
  float: left;
  border-radius: 4px;
  transition: background-color 0.8s ease;
}
.grid-cell:last-child {
  margin-right: 0;
}

body.theme-tien .grid-cell {
  background: var(--tien-grid-cell) !important;
}

body.theme-yeu .grid-cell {
  background: var(--yeu-grid-cell) !important;
}

/* ==========================================================================
   TILES (Ô CẢNH GIỚI TIẾN HÓA VISUAL)
   ========================================================================== */
.tile-container {
  position: absolute;
  z-index: 2;
}

.tile, .tile .tile-inner {
  width: 107px;
  height: 107px;
  line-height: 107px;
}

.tile {
  position: absolute;
  -webkit-transition: 100ms ease-in-out;
  -moz-transition: 100ms ease-in-out;
  transition: 100ms ease-in-out;
  -webkit-transition-property: -webkit-transform;
  -moz-transition-property: -moz-transform;
  transition-property: transform;
}

.tile .tile-inner {
  border-radius: 4px;
  text-align: center;
  font-weight: bold;
  z-index: 10;
  font-family: var(--font-title);
  box-sizing: border-box;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  line-height: 1.25;
}

/* Hoạt ảnh khi xuất hiện ô mới */
@keyframes pop-in {
  0% { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}
.tile-new .tile-inner {
  animation: pop-in 200ms ease-out both;
}

/* --- ☯️ THIẾT KẾ Ô TIÊN ĐẠO (TIÊN PHONG) --- */
/* Cấp thấp (2-16): Màu dịu mát, viền mỏng */
.theme-tien .tile-2 .tile-inner { background: #fcfbf7; color: var(--tien-text-dark); border: 1px solid #e1dbcd; }
.theme-tien .tile-4 .tile-inner { background: #f5f2e9; color: var(--tien-text-dark); border: 1px solid #dcd5c1; }
.theme-tien .tile-8 .tile-inner { background: #e9e5d4; color: var(--tien-primary); border: 1px solid #c8beab; }
.theme-tien .tile-16 .tile-inner { background: #dce1d1; color: var(--tien-primary); border: 1px solid #acbaa5; }

/* Cấp trung (32-128): Chuyển sắc óng ánh, viền vàng */
.theme-tien .tile-32 .tile-inner { background: linear-gradient(135deg, #b8d8be 0%, #8ebd99 100%); color: var(--tien-text-dark); border: 1px solid var(--tien-gold); }
.theme-tien .tile-64 .tile-inner { background: linear-gradient(135deg, #8ebd99 0%, #5fa170 100%); color: var(--tien-text-light); border: 1px solid var(--tien-gold); }
.theme-tien .tile-128 .tile-inner { background: linear-gradient(135deg, #5fa170 0%, var(--tien-primary) 100%); color: var(--tien-text-light); border: 1px solid var(--tien-gold); box-shadow: 0 0 8px var(--tien-gold-glow); }

/* Cấp cao (256-2048+): Vàng kim lộng lẫy, phát hào quang */
.theme-tien .tile-256 .tile-inner { background: linear-gradient(135deg, #f9eb97 0%, var(--tien-gold) 100%); color: #402f00; border: 2px solid #ffffff; box-shadow: 0 0 12px var(--tien-gold); text-shadow: 0 1px 2px rgba(255,255,255,0.8); }
.theme-tien .tile-512 .tile-inner { background: linear-gradient(135deg, #ffd700 0%, #b8860b 100%); color: #ffffff; border: 2px solid var(--tien-gold); box-shadow: 0 0 18px var(--tien-gold); text-shadow: 0 1px 4px rgba(0,0,0,0.5); }
.theme-tien .tile-1024 .tile-inner { background: radial-gradient(circle, #ffe773 0%, #cc9900 100%); color: #ffffff; border: 2px solid #ffffff; box-shadow: 0 0 25px var(--tien-gold); text-shadow: 0 1px 6px rgba(0,0,0,0.6); }
.theme-tien .tile-2048 .tile-inner { background: radial-gradient(circle, #ffffff 0%, #ffd700 70%, #b8860b 100%); color: var(--tien-primary); font-weight: bold; border: 3px double #ffffff; box-shadow: 0 0 35px #ffd700, inset 0 0 10px #ffffff; text-shadow: 0 0 5px #ffffff; animation: dotPhaAura 2s ease-in-out infinite; }
.theme-tien .tile-super .tile-inner { background: radial-gradient(circle, #e0fcfc 0%, #00ffff 100%); color: #0f3d2d; border: 2px solid #ffffff; box-shadow: 0 0 45px #00ffff; }

/* --- 🎋 HÌNH NỀN CẢNH GIỚI ĐỘC BẢN (IMAGE TILES - TIÊN ĐẠO) --- */
.theme-tien .tile .tile-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.30; /* Tăng độ sáng rõ từ đầu */
  pointer-events: none;
  filter: invert(1);
  mix-blend-mode: multiply;
  z-index: -1;
  transition: opacity 0.3s ease;
}

.theme-tien .tile:hover .tile-inner::before {
  opacity: 0.30;
}

.theme-tien .tile-2 .tile-inner::before { background-image: url("tiles/tien-2.jpg"); }
.theme-tien .tile-4 .tile-inner::before { background-image: url("tiles/tien-4.jpg"); }
.theme-tien .tile-8 .tile-inner::before { background-image: url("tiles/tien-8.jpg"); }
.theme-tien .tile-16 .tile-inner::before { background-image: url("tiles/tien-16.jpg"); }
.theme-tien .tile-32 .tile-inner::before { background-image: url("tiles/tien-32.jpg"); }
.theme-tien .tile-64 .tile-inner::before { background-image: url("tiles/tien-64.jpg"); }
.theme-tien .tile-128 .tile-inner::before { background-image: url("tiles/tien-128.jpg"); }
.theme-tien .tile-256 .tile-inner::before { background-image: url("tiles/tien-256.jpg"); }
.theme-tien .tile-512 .tile-inner::before { background-image: url("tiles/tien-512.jpg"); }
.theme-tien .tile-1024 .tile-inner::before { background-image: url("tiles/tien-1024.jpg"); }
.theme-tien .tile-2048 .tile-inner::before { background-image: url("tiles/tien-2048.jpg"); }

/* --- 🐉 THIẾT KẾ Ô YÊU ĐẠO (MA MỊ) --- */
/* Cấp thấp (2-16): Sắc tím xám tối */
.theme-yeu .tile-2 .tile-inner { background: #18151f; color: #a594bd; border: 1px solid #2d2638; }
.theme-yeu .tile-4 .tile-inner { background: #231d2d; color: #ba9fdc; border: 1px solid #3c304d; }
.theme-yeu .tile-8 .tile-inner { background: #2f253d; color: #c48df0; border: 1px solid #4a365f; }
.theme-yeu .tile-16 .tile-inner { background: #3e284c; color: #df96ff; border: 1px solid #63397d; }

/* Cấp trung (32-128): Chuyển sắc tà khí tím thẫm, viền ma quang */
.theme-yeu .tile-32 .tile-inner { background: linear-gradient(135deg, #3d1c5c 0%, #200938 100%); color: #ffd2ff; border: 1px solid var(--yeu-primary); }
.theme-yeu .tile-64 .tile-inner { background: linear-gradient(135deg, #5c1c4f 0%, #300926 100%); color: #ffd2ff; border: 1px solid var(--yeu-primary); }
.theme-yeu .tile-128 .tile-inner { background: linear-gradient(135deg, #7c1c3a 0%, #400918 100%); color: #ffffff; border: 1px solid var(--yeu-primary); box-shadow: 0 0 8px var(--yeu-purple-glow); }

/* Cấp cao (256-2048+): Huyết ma đỏ trầm cổ phong, viền mạ vàng kim, phát ma quang */
/* Đã thay thế hồng neon #ff2a6d bằng đỏ son ma đạo cổ phong + vàng kim huyền bí */
.theme-yeu .tile-256 .tile-inner { background: linear-gradient(135deg, #9b1c1c 0%, #4a0000 100%); color: #f5d0a9; border: 1px solid var(--yeu-accent); box-shadow: 0 0 14px var(--yeu-accent-glow); text-shadow: 0 1px 3px rgba(0,0,0,0.8); }
.theme-yeu .tile-512 .tile-inner { background: linear-gradient(135deg, #c0392b 0%, #7b241c 100%); color: #ffffff; border: 2px solid var(--yeu-gold); box-shadow: 0 0 18px var(--yeu-accent-glow); text-shadow: 0 1px 4px rgba(0,0,0,0.8); }
.theme-yeu .tile-1024 .tile-inner { background: radial-gradient(circle, #c0392b 0%, #4a001a 100%); color: #ffeaa7; border: 2px solid var(--yeu-gold); box-shadow: 0 0 26px var(--yeu-accent-glow), 0 0 50px rgba(201, 168, 76, 0.3); text-shadow: 0 1px 5px rgba(255,255,255,0.4); }
.theme-yeu .tile-2048 .tile-inner { background: radial-gradient(circle, var(--yeu-gold) 0%, #c0392b 50%, #4b0082 100%); color: #ffffff; font-weight: bold; border: 3px double var(--yeu-gold); box-shadow: 0 0 40px var(--yeu-accent-glow), 0 0 60px rgba(201, 168, 76, 0.5), inset 0 0 10px rgba(255,255,255,0.2); text-shadow: 0 0 8px rgba(255,255,220,0.9); animation: yeuWangAura 2s ease-in-out infinite; }
.theme-yeu .tile-super .tile-inner { background: radial-gradient(circle, #c9a84c 0%, #6d1a6d 50%, #0a0005 100%); color: #ffffff; border: 2px solid #c9a84c; box-shadow: 0 0 50px rgba(201, 168, 76, 0.8); }

/* --- 🐉 HÌNH NỀN CẢNH GIỚI ĐỘC BẢN (IMAGE TILES - ĐỘC BẢN CHO TỪNG CẤP) --- */
.theme-yeu .tile .tile-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.45; /* Tăng độ sáng rõ từ đầu */
  pointer-events: none;
  mix-blend-mode: screen;
  z-index: -1;
  transition: opacity 0.3s ease;
}

.theme-yeu .tile:hover .tile-inner::before {
  opacity: 0.45;
}

.theme-yeu .tile-2 .tile-inner::before { background-image: url("tiles/yeu-2.jpg"); }
.theme-yeu .tile-4 .tile-inner::before { background-image: url("tiles/yeu-4.jpg"); }
.theme-yeu .tile-8 .tile-inner::before { background-image: url("tiles/yeu-8.jpg"); }
.theme-yeu .tile-16 .tile-inner::before { background-image: url("tiles/yeu-16.jpg"); }
.theme-yeu .tile-32 .tile-inner::before { background-image: url("tiles/yeu-32.jpg"); }
.theme-yeu .tile-64 .tile-inner::before { background-image: url("tiles/yeu-64.jpg"); }
.theme-yeu .tile-128 .tile-inner::before { background-image: url("tiles/yeu-128.jpg"); }
.theme-yeu .tile-256 .tile-inner::before { background-image: url("tiles/yeu-256.jpg"); }
.theme-yeu .tile-512 .tile-inner::before { background-image: url("tiles/yeu-512.jpg"); }
.theme-yeu .tile-1024 .tile-inner::before { background-image: url("tiles/yeu-1024.jpg"); }
.theme-yeu .tile-2048 .tile-inner::before { background-image: url("tiles/yeu-2048.jpg"); }


/* --- ☠️ THIẾT KẾ Ô TÂM MA (-1) --- */
/* Nâng cấp: Hình nền ma tu màu trắng nổi bật, chữ màu đỏ viền đen cực kỳ dễ đọc */
.tile.tile-minus-1 .tile-inner {
  background: #0d0006 !important;
  color: #ff3b30 !important; /* Đạo hữu muốn chữ màu đỏ */
  border: 2.5px solid #ff3b30 !important;
  box-shadow: 0 0 20px rgba(255, 59, 48, 0.9), inset 0 0 10px rgba(180, 0, 0, 0.6) !important;
  /* Viền đen dày bo quanh chữ đỏ để tăng tối đa độ tương phản trên hình nền trắng */
  text-shadow: -1px -1px 0 #000, 1px -1px 0 #000, -1px 1px 0 #000, 1px 1px 0 #000, 0 2px 4px rgba(0,0,0,0.8) !important;
  animation: pulse-corruption 1.2s infinite alternate;
  font-size: 11px !important;
  line-height: 1.1 !important;
}

.tile.tile-minus-1 .tile-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("tiles/tam-ma.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.65; /* Sáng rõ hình ma tu màu trắng nền đen */
  pointer-events: none;
  mix-blend-mode: screen;
  z-index: -1;
}

@keyframes pulse-corruption {
  0% {
    transform: scale(1);
    box-shadow: 0 0 8px rgba(255, 59, 48, 0.6), inset 0 0 5px rgba(180, 0, 0, 0.4);
    border-color: #cc2a22;
  }
  100% {
    transform: scale(0.97);
    box-shadow: 0 0 24px rgba(255, 59, 48, 1), inset 0 0 12px rgba(200, 0, 0, 0.7);
    border-color: #ff3b30;
  }
}

/* ==========================================================================
   ANIMATIONS & EFFECTS (HOẠT ẢNH ĐỘT PHÁ & DỊCH CHUYỂN)
   ========================================================================== */
/* Hiệu ứng Gộp Ô - Đột Phá Cảnh Giới (Tiên Đạo) */
@keyframes dotPhaAura {
  0% { transform: scale(1); box-shadow: 0 0 10px var(--tien-gold); }
  50% { transform: scale(1.1); box-shadow: 0 0 25px var(--tien-gold); }
  100% { transform: scale(1); box-shadow: 0 0 10px var(--tien-gold); }
}

/* Hiệu ứng Thôn Phệ Cảnh Giới (Yêu Đạo - Yêu Vương 2048) */
@keyframes yeuWangAura {
  0% { transform: scale(1); box-shadow: 0 0 20px var(--yeu-accent-glow), 0 0 40px rgba(201,168,76,0.3); }
  50% { transform: scale(1.08); box-shadow: 0 0 35px var(--yeu-accent-glow), 0 0 65px rgba(201,168,76,0.6); }
  100% { transform: scale(1); box-shadow: 0 0 20px var(--yeu-accent-glow), 0 0 40px rgba(201,168,76,0.3); }
}

.tile-merged .tile-inner {
  z-index: 20;
  animation: dotPhaAura 300ms ease-in-out both;
}

/* Hiệu ứng mây trôi */
@keyframes driftClouds {
  0% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-10%, -15%) rotate(15deg) scale(1.05); }
  100% { transform: translate(0, 0) rotate(360deg); }
}

/* ==========================================================================
   DUAL-INDICATOR RANK BADGE (CHỈ SỐ PHỤ GÓC Ô - ĐỀ XUẤT CỦA HỘI ĐỒNG AI)
   Hiển thị số thứ bậc nhỏ ở góc trên bên phải mỗi ô, giúp người chơi
   quét nhanh cục diện bàn cờ mà không cần đọc tên cảnh giới
   ========================================================================== */
.tile .tile-inner {
  position: relative;
  color: #ffffff !important;
  text-shadow: -1px -1px 0 rgba(0,0,0,0.8), 1px -1px 0 rgba(0,0,0,0.8), -1px 1px 0 rgba(0,0,0,0.8), 1px 1px 0 rgba(0,0,0,0.8), 0 2px 4px rgba(0,0,0,0.6) !important;
}

.tile .tile-inner::after {
  content: attr(data-rank);
  position: absolute;
  top: 6px;
  right: 10px;
  font-size: 18px;
  font-family: var(--font-body);
  font-weight: 700;
  line-height: 1;
  opacity: 0.9;
  pointer-events: none;
  letter-spacing: 0;
  color: #ffffff !important;
  text-shadow: -1px -1px 0 rgba(0,0,0,0.8), 1px -1px 0 rgba(0,0,0,0.8), -1px 1px 0 rgba(0,0,0,0.8), 1px 1px 0 rgba(0,0,0,0.8) !important;
}

/* Ẩn badge ở ô Tâm Ma vì nó đã có hiệu ứng đặc biệt */
.tile.tile-minus-1 .tile-inner::after {
  display: none;
}

/* ==========================================================================
   TALISMANS SKILL BAR (THANH PHÁP BẢO / KỸ NĂNG)
   ========================================================================== */
.skills-bar {
  display: flex;
  justify-content: space-between;
  margin: 15px 0;
  gap: 8px;
}

.game-actions-bar {
  display: flex;
  justify-content: space-between;
  margin: 15px 0;
  gap: 8px;
}

.game-actions-bar .restart-button,
.game-actions-bar .skill-button {
  flex: 1;
  margin: 0;
  display: flex !important;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  height: 42px; /* Đồng bộ chiều cao tăm tắp */
  padding: 0 5px;
  font-size: 14px !important;
  line-height: 1 !important;
}

.skill-button {
  flex: 1;
  padding: 10px 5px;
  font-size: 13px;
  font-weight: bold;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-family: var(--font-title);
  border: 1px solid transparent;
}

.skill-button:hover {
  transform: translateY(-2px);
}

.skill-button:active {
  transform: scale(0.96);
}

body.theme-tien .skill-button {
  background: var(--tien-bg);
  color: var(--tien-primary);
  border-color: var(--tien-gold);
  box-shadow: 0 3px 6px rgba(0,0,0,0.05);
  font-family: var(--font-body); /* Dùng body font để dễ đọc */
}

body.theme-tien .skill-button:hover {
  background: #ffffff;
  box-shadow: 0 4px 10px var(--tien-gold-glow);
}

body.theme-yeu .skill-button {
  background: var(--yeu-board-bg);
  color: var(--yeu-text-light);
  border-color: var(--yeu-purple);
  box-shadow: 0 3px 8px rgba(0,0,0,0.2);
  font-family: var(--font-body); /* Dùng body font để dễ đọc */
}

body.theme-yeu .skill-button:hover {
  background: var(--yeu-grid-cell);
  border-color: var(--yeu-accent);
  box-shadow: 0 0 10px var(--yeu-accent-glow);
}

.charge-indicator {
  font-size: 11px;
  background: rgba(0,0,0,0.1);
  padding: 1px 5px;
  border-radius: 10px;
  font-family: var(--font-body);
}

body.theme-yeu .charge-indicator {
  background: rgba(255,255,255,0.15);
}

/* Hướng dẫn hủy diệt ô */
.destroy-instruction {
  display: none;
  text-align: center;
  background: #fff3cd;
  color: #856404;
  padding: 8px;
  border-radius: 4px;
  margin-top: 10px;
  font-size: 13px;
  border: 1px solid #ffeeba;
  animation: pulse-instruction 1.5s infinite alternate;
}

.destroy-instruction.active {
  display: block;
}

@keyframes pulse-instruction {
  0% { box-shadow: 0 0 3px rgba(133, 100, 4, 0.3); }
  100% { box-shadow: 0 0 10px rgba(133, 100, 4, 0.6); }
}

.cancel-destroy-btn {
  background: #dc3545;
  color: white;
  border: none;
  padding: 2px 8px;
  border-radius: 3px;
  cursor: pointer;
  font-weight: bold;
  margin-left: 8px;
  font-size: 11px;
}

/* Target Crosshair khi xóa ô */
.game-container.destroy-active {
  cursor: crosshair;
}
.game-container.destroy-active .tile {
  cursor: pointer;
}
.game-container.destroy-active .tile:hover .tile-inner {
  opacity: 0.6;
  outline: 3px solid #ff3b30;
  outline-offset: -3px;
  filter: brightness(0.8);
}

/* ==========================================================================
   MODALS STYLING (PHỦ CHIẾU TRUYỀN THỪA)
   ========================================================================== */
.tu-tien-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.tu-tien-modal.active {
  display: flex;
}

.modal-content {
  border-radius: 4px;
  padding: 25px;
  width: 320px;
  text-align: center;
  box-sizing: border-box;
  animation: modalSlide 0.4s cubic-bezier(0.19, 1, 0.22, 1);
  border: 1px solid transparent;
}

@keyframes modalSlide {
  0% { transform: translateY(-50px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

.modal-content h2 {
  font-family: var(--font-title);
  margin-top: 0;
  font-size: 26px;
}

body.theme-tien .modal-content {
  background: var(--tien-bg);
  border-color: var(--tien-gold);
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
  color: var(--tien-text-dark);
}
body.theme-tien .modal-content h2 {
  color: var(--tien-primary);
}

body.theme-yeu .modal-content {
  background: var(--yeu-board-bg);
  border-color: var(--yeu-accent);
  box-shadow: 0 0 28px var(--yeu-accent-glow);
  color: var(--yeu-text-light);
}
body.theme-yeu .modal-content h2 {
  color: var(--yeu-accent);
}

/* Lựa chọn phái */
.theme-choices {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.theme-choice {
  flex: 1;
  border-radius: 4px;
  padding: 15px 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.choice-icon {
  font-size: 32px;
  display: block;
  margin-bottom: 5px;
}

.theme-choice.choice-tien {
  background: #fdfcf7;
  border-color: #b2cfc2;
  color: var(--tien-primary);
}
.theme-choice.choice-tien:hover {
  border-color: var(--tien-gold);
  box-shadow: 0 0 15px var(--tien-gold-glow);
  transform: translateY(-2px);
}

.theme-choice.choice-yeu {
  background: #15111c;
  border-color: #4a365f;
  color: #ba9fdc;
}
.theme-choice.choice-yeu:hover {
  border-color: var(--yeu-accent);
  box-shadow: 0 0 15px var(--yeu-accent-glow);
  transform: translateY(-2px);
}

/* Nút trong Modal */
.modal-btn {
  width: 100%;
  padding: 12px;
  border-radius: 4px;
  font-family: var(--font-title);
  font-weight: bold;
  font-size: 16px;
  cursor: pointer;
  margin-top: 10px;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.modal-btn:hover {
  transform: translateY(-2px);
}

.modal-btn:active {
  transform: scale(0.97);
}

body.theme-tien .modal-btn.confirm-btn {
  background: var(--tien-primary);
  color: white;
  border-color: var(--tien-gold);
}
body.theme-tien .modal-btn.cancel-btn {
  background: #e3dccb;
  color: var(--tien-primary);
  border-color: #c8beab;
}

body.theme-yeu .modal-btn.confirm-btn {
  background: var(--yeu-accent);
  color: white;
  border-color: var(--yeu-gold);
}
body.theme-yeu .modal-btn.cancel-btn {
  background: #2a2436;
  color: var(--yeu-text-light);
  border-color: #4a365f;
}

/* --- 🔑 CẤU HÌNH PHONG CÁCH CỔ PHONG CHO CÁC MODAL MỚI --- */
.modal-subtitle {
  font-size: 12px;
  margin-bottom: 20px;
  line-height: 1.4;
  text-align: center;
}
body.theme-tien .modal-subtitle { color: #7a6e5a; }
body.theme-yeu .modal-subtitle { color: #8f7fa0; }

.input-group {
  margin-bottom: 15px;
  text-align: left;
}
.input-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 5px;
  font-family: var(--font-title);
}
body.theme-tien .input-group label { color: var(--tien-primary); }
body.theme-yeu .input-group label { color: var(--yeu-accent); }

.input-group input {
  width: 100%;
  padding: 10px;
  border-radius: 4px;
  font-family: inherit;
  font-size: 14px;
  box-sizing: border-box;
  transition: all 0.3s ease;
}
body.theme-tien .input-group input {
  background: #fdfdfa;
  color: var(--tien-text-dark);
  border: 1px solid #d2c8b0;
}
body.theme-yeu .input-group input {
  background: #0d0a14;
  color: var(--yeu-text-light);
  border: 1px solid #4a365f;
}
.input-group input:focus {
  outline: none;
}
body.theme-tien .input-group input:focus { border-color: var(--tien-gold); box-shadow: 0 0 6px var(--tien-gold-glow); }
body.theme-yeu .input-group input:focus { border-color: var(--yeu-accent); box-shadow: 0 0 6px var(--yeu-accent-glow); }

.auth-error-msg, .profile-msg {
  font-size: 13px;
  margin-bottom: 12px;
  min-height: 18px;
  font-weight: bold;
  text-align: center;
}

/* Các loại nút bấm mới trong Modal */
.modal-btn.google-btn {
  background: #2b394a;
  color: #ffffff;
  border-color: #4285f4;
  margin-top: 10px;
}
.modal-btn.google-btn:hover {
  background: #4285f4;
  border-color: #ffffff;
}
.google-icon {
  font-weight: bold;
  margin-right: 6px;
  color: #4285f4;
  background: white;
  padding: 0 4px;
  border-radius: 2px;
}

.modal-btn.leaderboard-btn-open {
  background: linear-gradient(135deg, #8b6b2b, #bfa14c);
  color: white;
  border-color: #ffffff;
}
.modal-btn.leaderboard-btn-open:hover {
  box-shadow: 0 0 10px rgba(201, 168, 76, 0.6);
}

.modal-btn.logout-btn {
  background: #3a1515;
  color: #ffbaba;
  border-color: #7b241c;
}
.modal-btn.logout-btn:hover {
  background: #c0392b;
  color: white;
  border-color: #ffffff;
}

/* Hồ sơ thông số */
.profile-stats {
  border-radius: 4px;
  padding: 12px;
  margin: 15px 0;
  text-align: left;
  font-size: 14px;
  line-height: 1.8;
  border: 1px solid transparent;
}
body.theme-tien .profile-stats {
  background: #f5efe2;
  border-color: #d5c8ab;
  color: var(--tien-text-dark);
}
body.theme-yeu .profile-stats {
  background: #110e17;
  border-color: #3b2a4c;
  color: var(--yeu-text-light);
}

/* --- 🏆 CSS PHONG THẦN BẢNG (LEADERBOARD) --- */
.leaderboard-content {
  width: 480px !important;
  max-width: 95vw;
}

.leaderboard-table-wrapper {
  max-height: 300px;
  overflow-y: auto;
  margin: 15px 0;
  border-radius: 4px;
  border: 1px solid transparent;
}
body.theme-tien .leaderboard-table-wrapper {
  background: #f5efe2;
  border-color: #d5c8ab;
}
body.theme-yeu .leaderboard-table-wrapper {
  background: #110e17;
  border-color: #3b2a4c;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.leaderboard-table th, .leaderboard-table td {
  padding: 10px 8px;
  border-bottom: 1px solid transparent;
}
body.theme-tien .leaderboard-table th, body.theme-tien .leaderboard-table td {
  border-bottom-color: #e5decb;
}
body.theme-yeu .leaderboard-table th, body.theme-yeu .leaderboard-table td {
  border-bottom-color: #231b2e;
}

.leaderboard-table th {
  position: sticky;
  top: 0;
  z-index: 10;
  font-family: var(--font-title);
  font-weight: bold;
}
body.theme-tien .leaderboard-table th {
  background: #eae3d0;
  color: var(--tien-primary);
}
body.theme-yeu .leaderboard-table th {
  background: #1c1524;
  color: var(--yeu-accent);
}

.user-ranking-footer {
  padding: 12px;
  border-radius: 4px;
  margin-top: 15px;
  text-align: center;
  font-size: 14px;
  font-weight: bold;
  border: 1px solid transparent;
}
body.theme-tien .user-ranking-footer {
  background: #eae3d0;
  border-color: #d5c8ab;
  color: var(--tien-text-dark);
}
body.theme-yeu .user-ranking-footer {
  background: #1c1524;
  border-color: #3b2a4c;
  color: var(--yeu-text-light);
}

/* Thanh Tiến trình xem quảng cáo (Linh Cảnh đếm ngược) */

/* Thanh Tiến trình xem quảng cáo (Linh Cảnh đếm ngược) */
.ad-progress-bar {
  width: 100%;
  height: 8px;
  background: #ddd;
  border-radius: 4px;
  overflow: hidden;
  margin: 15px 0 10px 0;
}
body.theme-yeu .ad-progress-bar {
  background: #222;
}

.ad-progress-fill {
  width: 0%;
  height: 100%;
  border-radius: 4px;
}
body.theme-tien .ad-progress-fill { background: var(--tien-gold); }
body.theme-yeu .ad-progress-fill { background: var(--yeu-accent); }

.ad-timer {
  font-weight: bold;
  font-size: 18px;
}

/* ==========================================================================
   GAME OVER / MESSAGE OVERLAY
   ========================================================================== */
.game-message {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  text-align: center;
  animation: fade-in 800ms ease 800ms both;
}

@keyframes fade-in {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

.game-message p {
  font-family: var(--font-title);
  font-size: 40px;
  font-weight: bold;
  line-height: 1.2;
  margin-top: 140px;
}

.game-message .lower {
  display: block;
  margin-top: 30px;
}

.game-message.game-won, .game-message.game-over {
  display: block;
}

.game-message.game-over .keep-playing-button {
  display: none;
}

body.theme-tien .game-message {
  background: rgba(244, 241, 234, 0.85);
  color: var(--tien-primary);
}

body.theme-yeu .game-message {
  background: rgba(15, 13, 19, 0.9);
  color: var(--yeu-accent);
}

/* ==========================================================================
   EXPLANATIONS & FOOTER (HƯỚNG DẪN CẢNH GIỚI)
   ========================================================================== */
.game-explanation {
  margin-top: 25px;
  font-size: 14px;
}

.instruction-box {
  padding: 15px;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: all 0.8s ease;
}

body.theme-tien .instruction-box {
  background: rgba(227, 220, 203, 0.4);
  border-color: #dcd5c1;
}

body.theme-yeu .instruction-box {
  background: rgba(28, 24, 36, 0.5);
  border-color: #2a2436;
}

.instruction-box h3 {
  margin-top: 0;
  font-size: 18px;
}

body.theme-tien .instruction-box h3 { color: var(--tien-primary); }
body.theme-yeu .instruction-box h3 { color: var(--yeu-accent); }

.instruction-box table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

.instruction-box th, .instruction-box td {
  padding: 6px;
  text-align: left;
}

body.theme-tien .instruction-box th { border-bottom: 2px solid #b2cfc2; }
body.theme-yeu .instruction-box th { border-bottom: 2px solid #3d1c5c; }

/* ==========================================================================
   COORDINATES & TRANSFORMATIONS (TỌA ĐỘ BÀN CỜ GỐC 2048)
   ========================================================================== */
.tile.tile-position-1-1 { -webkit-transform: translate(0px, 0px); -moz-transform: translate(0px, 0px); -ms-transform: translate(0px, 0px); transform: translate(0px, 0px); }
.tile.tile-position-1-2 { -webkit-transform: translate(0px, 121px); -moz-transform: translate(0px, 121px); -ms-transform: translate(0px, 121px); transform: translate(0px, 121px); }
.tile.tile-position-1-3 { -webkit-transform: translate(0px, 242px); -moz-transform: translate(0px, 242px); -ms-transform: translate(0px, 242px); transform: translate(0px, 242px); }
.tile.tile-position-1-4 { -webkit-transform: translate(0px, 363px); -moz-transform: translate(0px, 363px); -ms-transform: translate(0px, 363px); transform: translate(0px, 363px); }
.tile.tile-position-2-1 { -webkit-transform: translate(121px, 0px); -moz-transform: translate(121px, 0px); -ms-transform: translate(121px, 0px); transform: translate(121px, 0px); }
.tile.tile-position-2-2 { -webkit-transform: translate(121px, 121px); -moz-transform: translate(121px, 121px); -ms-transform: translate(121px, 121px); transform: translate(121px, 121px); }
.tile.tile-position-2-3 { -webkit-transform: translate(121px, 242px); -moz-transform: translate(121px, 242px); -ms-transform: translate(121px, 242px); transform: translate(121px, 242px); }
.tile.tile-position-2-4 { -webkit-transform: translate(121px, 363px); -moz-transform: translate(121px, 363px); -ms-transform: translate(121px, 363px); transform: translate(121px, 363px); }
.tile.tile-position-3-1 { -webkit-transform: translate(242px, 0px); -moz-transform: translate(242px, 0px); -ms-transform: translate(242px, 0px); transform: translate(242px, 0px); }
.tile.tile-position-3-2 { -webkit-transform: translate(242px, 121px); -moz-transform: translate(242px, 121px); -ms-transform: translate(242px, 121px); transform: translate(242px, 121px); }
.tile.tile-position-3-3 { -webkit-transform: translate(242px, 242px); -moz-transform: translate(242px, 242px); -ms-transform: translate(242px, 242px); transform: translate(242px, 242px); }
.tile.tile-position-3-4 { -webkit-transform: translate(242px, 363px); -moz-transform: translate(242px, 363px); -ms-transform: translate(242px, 363px); transform: translate(242px, 363px); }
.tile.tile-position-4-1 { -webkit-transform: translate(363px, 0px); -moz-transform: translate(363px, 0px); -ms-transform: translate(363px, 0px); transform: translate(363px, 0px); }
.tile.tile-position-4-2 { -webkit-transform: translate(363px, 121px); -moz-transform: translate(363px, 121px); -ms-transform: translate(363px, 121px); transform: translate(363px, 121px); }
.tile.tile-position-4-3 { -webkit-transform: translate(363px, 242px); -moz-transform: translate(363px, 242px); -ms-transform: translate(363px, 242px); transform: translate(363px, 242px); }
.tile.tile-position-4-4 { -webkit-transform: translate(363px, 363px); -moz-transform: translate(363px, 363px); -ms-transform: translate(363px, 363px); transform: translate(363px, 363px); }

/* ==========================================================================
   RESPONSIVE DESIGN (TƯƠNG THÍCH DI ĐỘNG & BẢNG TỌA ĐỘ CO GIÃN)
   ========================================================================== */
@media screen and (max-width: 520px) {
  html, body {
    font-size: 15px;
  }

  body {
    margin: 15px 0;
    padding: 0 12px;
  }

  .container {
    width: 280px;
    margin: 0 auto;
  }

  h1.title {
    font-size: 26px;
    margin-top: 10px;
  }

  .scores-container {
    margin-top: 2px;
  }

  .score-container, .best-container, .max-tile-container {
    padding: 10px 8px;
    font-size: 15px;
    min-width: 45px;
    height: 38px;
  }

  .max-tile-container {
    padding: 14px 6px 2px 6px;
    font-size: 10px;
    min-width: 65px;
  }

  .score-container:after, .best-container:after, .max-tile-container:after {
    font-size: 8px;
    top: 2px;
  }

  .restart-button, .keep-playing-button, .retry-button, .theme-btn {
    padding: 6px 12px;
    font-size: 12px;
  }

  .game-container {
    margin-top: 15px;
    padding: 10px;
    width: 280px;
    height: 280px;
  }

  .grid-cell {
    width: 57.5px;
    height: 57.5px;
    margin-right: 10px;
  }
  
  .grid-row {
    margin-bottom: 10px;
  }

  .tile, .tile .tile-inner {
    width: 58px;
    height: 58px;
    line-height: 58px;
  }

  .tile .tile-inner::after {
    font-size: 11px;
    top: 3px;
    right: 5px;
  }

  /* Tọa độ dịch chuyển di động */
  .tile.tile-position-1-1 { -webkit-transform: translate(0px, 0px); -moz-transform: translate(0px, 0px); -ms-transform: translate(0px, 0px); transform: translate(0px, 0px); }
  .tile.tile-position-1-2 { -webkit-transform: translate(0px, 67px); -moz-transform: translate(0px, 67px); -ms-transform: translate(0px, 67px); transform: translate(0px, 67px); }
  .tile.tile-position-1-3 { -webkit-transform: translate(0px, 135px); -moz-transform: translate(0px, 135px); -ms-transform: translate(0px, 135px); transform: translate(0px, 135px); }
  .tile.tile-position-1-4 { -webkit-transform: translate(0px, 202px); -moz-transform: translate(0px, 202px); -ms-transform: translate(0px, 202px); transform: translate(0px, 202px); }
  .tile.tile-position-2-1 { -webkit-transform: translate(67px, 0px); -moz-transform: translate(67px, 0px); -ms-transform: translate(67px, 0px); transform: translate(67px, 0px); }
  .tile.tile-position-2-2 { -webkit-transform: translate(67px, 67px); -moz-transform: translate(67px, 67px); -ms-transform: translate(67px, 67px); transform: translate(67px, 67px); }
  .tile.tile-position-2-3 { -webkit-transform: translate(67px, 135px); -moz-transform: translate(67px, 135px); -ms-transform: translate(67px, 135px); transform: translate(67px, 135px); }
  .tile.tile-position-2-4 { -webkit-transform: translate(67px, 202px); -moz-transform: translate(67px, 202px); -ms-transform: translate(67px, 202px); transform: translate(67px, 202px); }
  .tile.tile-position-3-1 { -webkit-transform: translate(135px, 0px); -moz-transform: translate(135px, 0px); -ms-transform: translate(135px, 0px); transform: translate(135px, 0px); }
  .tile.tile-position-3-2 { -webkit-transform: translate(135px, 67px); -moz-transform: translate(135px, 67px); -ms-transform: translate(135px, 67px); transform: translate(135px, 67px); }
  .tile.tile-position-3-3 { -webkit-transform: translate(135px, 135px); -moz-transform: translate(135px, 135px); -ms-transform: translate(135px, 135px); transform: translate(135px, 135px); }
  .tile.tile-position-3-4 { -webkit-transform: translate(135px, 202px); -moz-transform: translate(135px, 202px); -ms-transform: translate(135px, 202px); transform: translate(135px, 202px); }
  .tile.tile-position-4-1 { -webkit-transform: translate(202px, 0px); -moz-transform: translate(202px, 0px); -ms-transform: translate(202px, 0px); transform: translate(202px, 0px); }
  .tile.tile-position-4-2 { -webkit-transform: translate(202px, 67px); -moz-transform: translate(202px, 67px); -ms-transform: translate(202px, 67px); transform: translate(202px, 67px); }
  .tile.tile-position-4-3 { -webkit-transform: translate(202px, 135px); -moz-transform: translate(202px, 135px); -ms-transform: translate(202px, 135px); transform: translate(202px, 135px); }
  .tile.tile-position-4-4 { -webkit-transform: translate(202px, 202px); -moz-transform: translate(202px, 202px); -ms-transform: translate(202px, 202px); transform: translate(202px, 202px); }

  .game-message p {
    font-size: 26px !important;
    margin-top: 80px !important;
  }
  
  .game-message .lower {
    margin-top: 25px !important;
  }

  .skills-bar {
    margin: 10px 0;
    gap: 4px;
  }

  .skill-button {
    padding: 8px 3px;
    font-size: 10px;
  }

  .theme-choices {
    flex-direction: column;
    gap: 8px;
  }

  .theme-choice {
    padding: 10px;
  }

  .theme-choice h3 {
    margin: 2px 0;
    font-size: 14px;
  }

  .choice-icon {
    font-size: 20px;
  }

  .modal-content {
    padding: 15px;
    width: 260px;
  }

  .modal-content h2 {
    font-size: 20px;
  }
}

/* ==========================================================================
   TRIBULATION & BREAKTHROUGH EFFECTS (HIỆU ỨNG ĐỘ KIẾP LÔI KIẾP)
   ========================================================================== */
.lightning-flash-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.05s ease;
}

.lightning-flash-overlay.flash-active-tien {
  animation: flashTien 1.0s ease-out;
}

.lightning-flash-overlay.flash-active-yeu {
  animation: flashYeu 1.0s ease-out;
}

@keyframes flashTien {
  0% { opacity: 0; }
  8% { opacity: 0.95; background-color: #ffffff; }
  15% { opacity: 0.15; }
  22% { opacity: 0.9; background-color: #ffd700; }
  35% { opacity: 0.1; }
  48% { opacity: 0.85; background-color: #ffffff; }
  65% { opacity: 0.4; }
  100% { opacity: 0; background-color: #ffd700; }
}

@keyframes flashYeu {
  0% { opacity: 0; }
  8% { opacity: 0.95; background-color: #c0392b; }
  15% { opacity: 0.15; }
  22% { opacity: 0.9; background-color: #4b0082; }
  35% { opacity: 0.1; }
  48% { opacity: 0.85; background-color: #c0392b; }
  65% { opacity: 0.4; }
  100% { opacity: 0; background-color: #4b0082; }
}

/* Screen Shake Effect */
.shake-effect {
  animation: shakeScreen 0.4s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shakeScreen {
  10%, 90% { transform: translate3d(-2px, 0, 0); }
  20%, 80% { transform: translate3d(3px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-6px, 0, 0); }
  40%, 60% { transform: translate3d(6px, 0, 0); }
}

/* Floating do-kiep / dot-pha text bubble */
.do-kiep-text {
  position: absolute;
  width: 100%;
  text-align: center;
  top: -30px;
  left: 0;
  font-family: var(--font-title);
  font-weight: bold;
  font-size: 16px;
  z-index: 100;
  pointer-events: none;
  color: var(--tien-primary);
  text-shadow: 0 1px 2px rgba(255,255,255,0.8), 0 0 5px rgba(255,255,255,0.5);
  animation: floatUpFade 1.8s ease-out forwards;
}

body.theme-yeu .do-kiep-text {
  color: var(--yeu-accent);
  text-shadow: 0 1px 2px rgba(0,0,0,0.9), 0 0 8px var(--yeu-accent-glow);
}

.do-kiep-text.text-gold {
  color: #ffe773;
  font-size: 20px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.8), 0 0 12px rgba(212, 175, 55, 0.7);
  animation: floatUpFadeLarge 2.2s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
}

body.theme-yeu .do-kiep-text.text-gold {
  color: var(--yeu-gold);
  text-shadow: 0 2px 4px rgba(0,0,0,0.9), 0 0 15px rgba(192, 57, 43, 0.8);
}

@keyframes floatUpFade {
  0% { transform: translateY(0); opacity: 0; }
  15% { opacity: 1; }
  100% { transform: translateY(-70px); opacity: 0; }
}

@keyframes floatUpFadeLarge {
  0% { transform: translateY(0) scale(0.6); opacity: 0; }
  25% { opacity: 1; transform: translateY(-15px) scale(1.1); }
  100% { transform: translateY(-95px) scale(0.9); opacity: 0; }
}

/* Hiệu ứng Điểm cộng bay lên tại ô bị phá hủy (Tâm Ma) */
.floating-points-tile {
  z-index: 150 !important;
  pointer-events: none;
}

.floating-points-inner {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 32px !important;
  text-align: center;
  display: flex !important;
  align-items: center;
  justify-content: center;
  
  /* Mặc định màu đỏ phát sáng của Ma Đạo/Yêu Tộc */
  color: #ff3b30 !important;
  text-shadow: 0 0 10px rgba(255, 59, 48, 0.9), -2px -2px 0 #000, 2px -2px 0 #000, -2px 2px 0 #000, 2px 2px 0 #000 !important;
  
  animation: float-up-fade-points 2400ms cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

body.theme-tien .floating-points-inner {
  /* Màu vàng phát sáng của Tiên Tộc */
  color: #f1c40f !important;
  text-shadow: 0 0 10px rgba(241, 196, 15, 0.9), -2px -2px 0 #000, 2px -2px 0 #000, -2px 2px 0 #000, 2px 2px 0 #000 !important;
}

@keyframes float-up-fade-points {
  0% {
    transform: translateY(0) scale(0.7);
    opacity: 0;
  }
  15% {
    transform: translateY(-12px) scale(1.25);
    opacity: 1;
  }
  100% {
    transform: translateY(-170px) scale(1);
    opacity: 0;
  }
}

/* Giao diện bộ chọn ngôn ngữ (Language Selector) */
select.lang-selector {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  text-align: center;
  text-align-last: center;
  padding: 0 10px;
  cursor: pointer;
}

select.lang-selector option {
  background: #ffffff;
  color: #333333;
}

body.theme-tien select.lang-selector option {
  background: var(--tien-bg);
  color: var(--tien-primary);
}

body.theme-yeu select.lang-selector option {
  background: var(--yeu-board-bg);
  color: var(--yeu-text-light);
}

/* ==========================================================================
   DARK MODE COMPATIBILITY & OVERRIDES
   ========================================================================== */

/* Thiết lập color-scheme cục bộ để đồng bộ hóa scrollbar và browser elements */
body.theme-tien {
  color-scheme: light;
}

body.theme-yeu {
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* --- ☯️ MÀU CHÍNH ĐẠO TRONG DARK MODE --- */
    --tien-bg: #121614;            /* Giấy Tuyên Tối / Xanh Bích Cực Tối */
    --tien-board-bg: #1b221e;      /* Nền Bàn Cờ Đá Tối */
    --tien-grid-cell: #242f2a;     /* Ô trống bàn cờ Tiên tối */
    --tien-primary: #3d8b7a;       /* Xanh Bích Ngọc sáng hơn để tương phản tốt */
    --tien-gold: #e5c158;          /* Vàng Hoàng Kim sáng hơn */
    --tien-gold-glow: rgba(229, 193, 88, 0.25);
    --tien-text-dark: #e2ece8;     /* Chữ sáng (Off-white) */
  }

  body.theme-tien {
    color-scheme: dark;
  }

  /* Làm tối màu nền của các ô số thấp Tiên Đạo để tránh chói mắt */
  body.theme-tien .tile-2 .tile-inner { background: #1a2420; color: var(--tien-text-dark); border-color: #2d3f37; }
  body.theme-tien .tile-4 .tile-inner { background: #22302a; color: var(--tien-text-dark); border-color: #364e43; }
  body.theme-tien .tile-8 .tile-inner { background: #2b3c34; color: var(--tien-gold); border-color: #456254; }
  body.theme-tien .tile-16 .tile-inner { background: #364d42; color: var(--tien-gold); border-color: #547767; }

  /* Đổi blend-mode sang screen để hiển thị watermark tranh vẽ nét sáng trên nền tối */
  body.theme-tien .tile .tile-inner::before {
    filter: invert(1);
    mix-blend-mode: screen;
    opacity: 0.20;
  }

  /* Đồng bộ hóa giao diện Hộp Hướng dẫn */
  body.theme-tien .instruction-box {
    background: rgba(44, 59, 52, 0.4) !important;
    border-color: #2c3b34 !important;
  }
  body.theme-tien .instruction-box h3 {
    color: var(--tien-primary) !important;
  }
  body.theme-tien .instruction-box th {
    border-bottom-color: #3d8b7a !important;
  }

  /* Đồng bộ hóa giao diện Modals */
  body.theme-tien .theme-choice.choice-tien {
    background: #1b221e;
    border-color: #2c3b34;
    color: var(--tien-primary);
  }
  body.theme-tien .input-group input {
    background: #141b18;
    color: var(--tien-text-dark);
    border-color: #2c3b34;
  }
  body.theme-tien .input-group input:focus {
    border-color: var(--tien-gold);
  }

  /* Đồng bộ hóa bảng xếp hạng (Leaderboard) */
  body.theme-tien .leaderboard-table-wrapper {
    background: #1b221e;
    border-color: #2c3b34;
  }
  body.theme-tien .leaderboard-table th {
    background: #242f2a;
    color: var(--tien-primary);
  }
  body.theme-tien .leaderboard-table td {
    border-bottom-color: #2c3b34;
  }
  body.theme-tien .user-ranking-footer {
    background: #242f2a;
    border-color: #2c3b34;
    color: var(--tien-text-dark);
  }

  /* Nút hành động và nút tiếng Việt */
  body.theme-tien select.lang-selector option {
    background: #1b221e;
    color: var(--tien-text-dark);
  }

  /* Đồng bộ hóa giao diện thông báo kết quả (Thua cuộc/Trùng sinh, Chiến thắng) */
  body.theme-tien .game-message {
    background: rgba(18, 22, 20, 0.92) !important;
    color: var(--tien-text-dark) !important;
  }
  body.theme-tien .game-message p {
    color: var(--tien-text-dark) !important;
  }
}