:root {
    --bg: #050510;
    --bg-elevated: #0b0b20;
    --bg-panel: rgba(8, 9, 22, 0.85);
    --accent: #5aaaff;
    --accent-2: #ff6eb4;
    --accent-3: #7ef9ff;
    --accent-soft: rgba(90, 170, 255, 0.2);
    --accent-soft-2: rgba(255, 110, 180, 0.18);
    --accent-glow: rgba(90, 170, 255, 0.85);
    --accent-glow-soft: rgba(90, 170, 255, 0.3);
    --accent-3-glow: rgba(126, 249, 255, 0.8);
    --accent-3-soft: rgba(126, 249, 255, 0.2);
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
    --page-glow: #16163b;
    --page-bg: #020212;
    --header-grad-start: rgba(90,170,255,0.18);
    --header-grad-end: rgba(255,110,180,0.15);
    --text: #f3f4ff;
    --text-muted: #a5a7c4;
    --card-radius: 18px;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --shadow-soft: 0 28px 80px rgba(0, 0, 0, 0.7);
    --transition-fast: 0.2s ease-out;
    --transition-med: 0.3s ease-out;
    --snake-gradient-start: #141433;
    --snake-gradient-end: #050510;
}

body[data-theme="nebula"] {
    --accent: #5aaaff;
    --accent-2: #ff6eb4;
    --accent-3: #7ef9ff;
    --accent-soft: rgba(90, 170, 255, 0.2);
    --accent-soft-2: rgba(255, 110, 180, 0.18);
    --accent-glow: rgba(90, 170, 255, 0.85);
    --accent-glow-soft: rgba(90, 170, 255, 0.3);
    --accent-3-glow: rgba(126, 249, 255, 0.8);
    --accent-3-soft: rgba(126, 249, 255, 0.2);
    --page-glow: #16163b;
    --page-bg: #020212;
    --bg-elevated: #0b0b20;
    --snake-gradient-start: #141433;
    --snake-gradient-end: #050510;
    --header-grad-start: rgba(90,170,255,0.18);
    --header-grad-end: rgba(255,110,180,0.15);
    --texture-layer-a: repeating-linear-gradient(
            135deg,
            rgba(255,255,255,0.05) 0px,
            rgba(255,255,255,0.05) 1px,
            transparent 1px,
            transparent 14px
    );
    --texture-layer-b: radial-gradient(circle, rgba(126,249,255,0.12) 1px, transparent 1px);
    --texture-size-a: 320px 320px;
    --texture-size-b: 220px 220px;
}

body[data-theme="solaris"] {
    --accent: #ff9f43;
    --accent-2: #ff6b6b;
    --accent-3: #ffd166;
    --accent-soft: rgba(255, 159, 67, 0.22);
    --accent-soft-2: rgba(255, 107, 107, 0.2);
    --accent-glow: rgba(255, 159, 67, 0.85);
    --accent-glow-soft: rgba(255, 159, 67, 0.3);
    --accent-3-glow: rgba(255, 209, 102, 0.85);
    --accent-3-soft: rgba(255, 209, 102, 0.25);
    --page-glow: #3b1f1f;
    --page-bg: #140609;
    --bg-elevated: #1b0c10;
    --snake-gradient-start: #2d1014;
    --snake-gradient-end: #0c0508;
    --header-grad-start: rgba(255,159,67,0.2);
    --header-grad-end: rgba(255,107,107,0.18);
    --texture-layer-a: repeating-linear-gradient(
            155deg,
            rgba(255,209,102,0.12) 0px,
            rgba(255,209,102,0.12) 2px,
            transparent 2px,
            transparent 16px
    );
    --texture-layer-b: radial-gradient(circle, rgba(255,159,67,0.15) 1px, transparent 1px);
    --texture-size-a: 260px 260px;
    --texture-size-b: 180px 180px;
}

body[data-theme="aqua"] {
    --accent: #4bdcff;
    --accent-2: #6cffc7;
    --accent-3: #7ef9ff;
    --accent-soft: rgba(75, 220, 255, 0.2);
    --accent-soft-2: rgba(108, 255, 199, 0.18);
    --accent-glow: rgba(75, 220, 255, 0.85);
    --accent-glow-soft: rgba(75, 220, 255, 0.3);
    --accent-3-glow: rgba(126, 249, 255, 0.8);
    --accent-3-soft: rgba(126, 249, 255, 0.2);
    --page-glow: #0d2b30;
    --page-bg: #031018;
    --bg-elevated: #071722;
    --snake-gradient-start: #0c1f2a;
    --snake-gradient-end: #031018;
    --header-grad-start: rgba(75,220,255,0.2);
    --header-grad-end: rgba(108,255,199,0.18);
    --texture-layer-a: repeating-linear-gradient(
            115deg,
            rgba(126,249,255,0.12) 0px,
            rgba(126,249,255,0.12) 1px,
            transparent 1px,
            transparent 18px
    );
    --texture-layer-b: radial-gradient(circle, rgba(108,255,199,0.18) 1px, transparent 1px);
    --texture-size-a: 300px 300px;
    --texture-size-b: 200px 200px;
}

body[data-theme="ember"] {
    --accent: #ff7b54;
    --accent-2: #ff4d6d;
    --accent-3: #ffd166;
    --accent-soft: rgba(255, 123, 84, 0.22);
    --accent-soft-2: rgba(255, 77, 109, 0.2);
    --accent-glow: rgba(255, 123, 84, 0.85);
    --accent-glow-soft: rgba(255, 123, 84, 0.3);
    --accent-3-glow: rgba(255, 209, 102, 0.85);
    --accent-3-soft: rgba(255, 209, 102, 0.25);
    --page-glow: #3c1512;
    --page-bg: #120607;
    --bg-elevated: #1b0a0c;
    --snake-gradient-start: #2b0f12;
    --snake-gradient-end: #100508;
    --header-grad-start: rgba(255,123,84,0.2);
    --header-grad-end: rgba(255,77,109,0.18);
    --texture-layer-a: repeating-linear-gradient(
            125deg,
            rgba(255,141,108,0.14) 0px,
            rgba(255,141,108,0.14) 2px,
            transparent 2px,
            transparent 14px
    );
    --texture-layer-b: radial-gradient(circle, rgba(255,209,102,0.18) 1px, transparent 1px);
    --texture-size-a: 260px 260px;
    --texture-size-b: 200px 200px;
}

body[data-theme="verdant"] {
    --accent: #47e08b;
    --accent-2: #2fd9a5;
    --accent-3: #9ef0c6;
    --accent-soft: rgba(71, 224, 139, 0.2);
    --accent-soft-2: rgba(47, 217, 165, 0.18);
    --accent-glow: rgba(71, 224, 139, 0.85);
    --accent-glow-soft: rgba(71, 224, 139, 0.3);
    --accent-3-glow: rgba(158, 240, 198, 0.8);
    --accent-3-soft: rgba(158, 240, 198, 0.2);
    --page-glow: #0f2c1e;
    --page-bg: #03110a;
    --bg-elevated: #071a12;
    --snake-gradient-start: #0f2418;
    --snake-gradient-end: #03110a;
    --header-grad-start: rgba(71,224,139,0.2);
    --header-grad-end: rgba(47,217,165,0.18);
    --texture-layer-a: repeating-linear-gradient(
            140deg,
            rgba(158,240,198,0.14) 0px,
            rgba(158,240,198,0.14) 1px,
            transparent 1px,
            transparent 16px
    );
    --texture-layer-b: radial-gradient(circle, rgba(71,224,139,0.16) 1px, transparent 1px);
    --texture-size-a: 300px 300px;
    --texture-size-b: 210px 210px;
}

body[data-game="menu"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
    --texture-layer-a: repeating-linear-gradient(
            120deg,
            rgba(255,255,255,0.04) 0px,
            rgba(255,255,255,0.04) 1px,
            transparent 1px,
            transparent 12px
    );
    --texture-layer-b: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
    --texture-size-a: 280px 280px;
    --texture-size-b: 180px 180px;
}

body[data-game="snake"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
}

body[data-game="2048"] {
    --panel-accent: var(--accent-3-soft);
    --panel-accent-2: var(--accent-soft);
    --panel-accent-3: var(--accent-soft-2);
}

body[data-game="coin"] {
    --panel-accent: var(--accent-soft-2);
    --panel-accent-2: var(--accent-soft);
    --panel-accent-3: var(--accent-3-soft);
}

body[data-game="tetris"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
}

body[data-game="sudoku"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-3-soft);
    --panel-accent-3: var(--accent-soft-2);
}

body[data-game="poker"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: radial-gradient(circle at top, var(--page-glow), var(--page-bg) 60%);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
    min-height: 100vh;
}

body {
    display: flex;
    align-items: stretch;
    justify-content: center;
    position: relative;
    isolation: isolate;
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: -20%;
    z-index: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

body::before {
    background:
    var(--texture-layer-a),
    var(--texture-layer-b),
    radial-gradient(circle at 20% 20%, var(--accent-soft), transparent 55%),
    radial-gradient(circle at 80% 10%, var(--accent-soft-2), transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(255,255,255,0.05), transparent 60%);
    filter: blur(10px);
    background-size: var(--texture-size-a), var(--texture-size-b), auto, auto, auto;
    animation: ambientFloat 18s ease-in-out infinite, textureDrift 26s linear infinite;
    opacity: 0.9;
}

body::after {
    background: conic-gradient(from 120deg,
    rgba(255,255,255,0.05),
    var(--accent-soft),
    rgba(255,255,255,0.02),
    var(--accent-soft-2),
    rgba(255,255,255,0.06));
    filter: blur(40px);
    mix-blend-mode: screen;
    animation: ambientSpin 28s linear infinite;
    opacity: 0.5;
}

body[data-ambient="off"]::before,
body[data-ambient="off"]::after {
    opacity: 0;
}

/* ====== App Shell ====== */

.app-shell {
    width: min(1200px, 100vw);
    min-height: 100vh;
    padding: 24px 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
    z-index: 1;
}

.app-shell::before,
.app-shell::after {
    content: "";
    position: absolute;
    inset: -30%;
    pointer-events: none;
    z-index: 0;
}

.app-shell::before {
    background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.08), transparent 55%),
    radial-gradient(circle at 80% 40%, rgba(255,255,255,0.04), transparent 60%);
    opacity: 0.6;
    filter: blur(30px);
}

.app-shell::after {
    background: repeating-linear-gradient(
            120deg,
            rgba(255,255,255,0.02) 0px,
            rgba(255,255,255,0.02) 1px,
            transparent 1px,
            transparent 10px
    );
    opacity: 0.4;
    mix-blend-mode: screen;
}

.app-shell > * {
    position: relative;
    z-index: 1;
}

.app-header {
    padding: 14px 20px;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--header-grad-start), var(--header-grad-end));
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.header-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.theme-select {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.theme-dropdown {
    background: rgba(5, 7, 20, 0.65);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--text);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
}

.theme-dropdown:focus-visible {
    box-shadow: 0 0 0 2px rgba(255,255,255,0.25);
}

.app-header h1 {
    margin: 0;
    font-weight: 650;
    letter-spacing: 0.03em;
}

.app-header p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 720px) {
    .header-main {
        flex-direction: column;
        align-items: flex-start;
    }
}

.app-footer {
    margin-top: auto;
    padding-top: 8px;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.muted {
    color: var(--text-muted);
}

/* ====== Screens ====== */

.screen {
    display: none;
}

.screen.active {
    display: block;
    animation: screenIn 0.3s ease-out both;
}

@keyframes screenIn {
    from { opacity: 0; transform: translateY(10px); filter: blur(3px); }
    to   { opacity: 1; transform: translateY(0);    filter: blur(0); }
}

/* ====== Game Grid（大厅）====== */

.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.game-card {
    padding: 18px 18px 16px;
    border-radius: var(--card-radius);
    background: radial-gradient(circle at top left, var(--accent-soft), var(--bg-elevated));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
}

.game-card::before {
    content: "";
    position: absolute;
    inset: -30%;
    background: radial-gradient(circle at 0% 0%, rgba(255,255,255,0.06), transparent 50%);
    opacity: 0;
    transform: translate3d(-10px, -10px, 0);
    pointer-events: none;
    transition: opacity var(--transition-med);
}

.game-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 32px 90px rgba(0, 0, 0, 0.85);
    border-color: var(--accent-glow-soft);
}

.game-card:hover::before {
    opacity: 1;
}

.game-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px;
}

.game-card-header h2 {
    margin: 0;
    font-size: 1.15rem;
}

.game-desc {
    margin: 4px 0 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.game-tags {
    list-style: none;
    padding: 0;
    margin: 0 0 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.75rem;
}

.game-tags li {
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

/* ====== Buttons / Badges ====== */

.btn {
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
    padding: 8px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-color: transparent;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.55);
}

.btn.ghost {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.18);
}

.btn.small {
    font-size: 0.8rem;
    padding: 4px 10px;
}

.btn:disabled {
    opacity: 0.4;
    cursor: default;
    box-shadow: none;
}

.badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
}

.badge-live {
    background: radial-gradient(circle at top, #ff6b6b, #ff2d55);
    color: white;
}

/* Disabled 卡片样式 */
.game-card.disabled {
    opacity: 0.55;
    filter: grayscale(0.25);
}

/* ====== Snake 屏幕布局 ====== */

.snake-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.9));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.snake-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.snake-title h2 {
    margin: 0;
    font-size: 1.1rem;
}

.snake-title .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.skin-indicator {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 主体：左图右侧栏 */

.snake-main {
    display: grid;
    grid-template-columns: minmax(0, 2.3fr) minmax(220px, 0.9fr);
    gap: 16px;
    align-items: start;
}

#snake-canvas {
    width: 100%;
    max-width: 720px;
    border-radius: 18px;
    border: 1px solid var(--accent-glow-soft);
    background: radial-gradient(circle at top, var(--snake-gradient-start), var(--snake-gradient-end));
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.9);
    display: block;
}

/* 让 canvas 在高 DPI 屏幕上更清晰 */
@media (min-resolution: 2dppx) {
    #snake-canvas {
        image-rendering: optimizeQuality;
    }
}

/* 右侧信息卡片 */

.snake-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.info-card {
    padding: 10px 12px;
    border-radius: 14px;
    background: var(--bg-panel);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.75);
}

.info-card h3 {
    margin: 0 0 4px;
    font-size: 0.9rem;
}

.info-card p {
    margin: 0 0 6px;
    font-size: 0.9rem;
}

.info-card .muted {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* 响应式：窄屏时上下排列 */

@media (max-width: 880px) {
    .snake-main {
        grid-template-columns: 1fr;
    }
}

/* 超窄屏：整体留点呼吸空间 */

@media (max-width: 600px) {
    .app-shell {
        padding: 16px 10px 10px;
    }

    .snake-layout {
        padding: 12px;
    }
}

/* ====== 2048 布局 ====== */

.game2048-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.9));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.game2048-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.game2048-title h2 {
    margin: 0;
    font-size: 1.1rem;
}

.game2048-title .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.game2048-status {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.game2048-main {
    display: grid;
    grid-template-columns: minmax(260px, 1.5fr) minmax(220px, 0.9fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 880px) {
    .game2048-main {
        grid-template-columns: 1fr;
    }
}

/* ====== 2048 棋盘 ====== */

.board-2048 {
    position: relative;
    width: 340px;
    height: 340px;
    max-width: 100%;
    max-height: 100%;
    border-radius: 18px;
    background: rgba(5,5,20,0.96);
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9);
    overflow: hidden;
}

.board-2048-overlay {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: linear-gradient(180deg, rgba(10,10,30,0.92), rgba(0,0,0,0.92));
    backdrop-filter: blur(2px);
    z-index: 3;
}

.board-2048-overlay.visible {
    display: flex;
}

.overlay-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.16);
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 14px 40px rgba(0,0,0,0.85);
    max-width: 260px;
    text-align: center;
}

.overlay-title {
    margin: 0 0 6px;
    font-weight: 700;
    font-size: 1rem;
    color: #fff;
}

.overlay-desc {
    margin: 0 0 12px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.overlay-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.board-2048-bg,
.board-2048-tiles {
    position: absolute;
    inset: 0;
}

.board-2048-bg {
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 12px;
}

.board-2048-bg .cell-2048 {
    border-radius: 10px;
    background: radial-gradient(circle at top, #262655, #15152d);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.03);
}

/* tiles 容器：绝对定位 */
.board-2048-tiles {
    position: absolute;
    left: 12px;
    top: 12px;
    right: 12px;
    bottom: 12px;
}

/* tile 样式 */

.tile-2048 {
    position: absolute;
    width: 72px;
    height: 72px;
    border-radius: 10px;
    background: #eee4da;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.4rem;
    color: #776e65;
    box-shadow: 0 10px 30px rgba(0,0,0,0.6);
    transition:
            transform 0.12s ease-out,
            background 0.15s ease-out,
            box-shadow 0.15s ease-out;
}

/* 新 tile 出现动画 */
.tile-2048.tile-new {
    animation: tile-pop 0.18s ease-out;
}

/* 合并 tile bump 动画 */
.tile-2048.tile-merged {
    animation: tile-bump 0.16s ease-out;
}

.tile-2048.tile-glow {
    box-shadow:
            0 0 20px rgba(255,255,255,0.3),
            0 10px 30px rgba(0,0,0,0.8);
}

.tile-2048.tile-glow-strong {
    box-shadow:
            0 0 28px rgba(255,255,200,0.6),
            0 14px 40px rgba(0,0,0,0.9);
}

.board-2048.board-pulse {
    animation: boardPulse 0.18s ease-out;
}

.board-2048.board-pulse-strong {
    animation: boardPulseStrong 0.28s ease-out;
}

@keyframes boardPulse {
    0%   { transform: scale(1); box-shadow: 0 18px 60px rgba(0,0,0,0.9); }
    40%  { transform: scale(1.02); box-shadow: 0 24px 70px rgba(255,255,255,0.12); }
    100% { transform: scale(1); box-shadow: 0 18px 60px rgba(0,0,0,0.9); }
}

@keyframes boardPulseStrong {
    0%   { transform: scale(1); }
    30%  { transform: scale(1.04); box-shadow: 0 28px 90px rgba(255,230,160,0.55); }
    100% { transform: scale(1); }
}

@keyframes tile-pop {
    0% { transform: scale(0.4); opacity: 0; }
    60% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(1); }
}

@keyframes tile-bump {
    0% { transform: scale(1); }
    50% { transform: scale(1.08); }
    100% { transform: scale(1); }
}

/* 不同数值的颜色，可以按喜好再调 */

.tile-v-2    { background: #eee4da; color: #776e65; }
.tile-v-4    { background: #ede0c8; color: #776e65; }
.tile-v-8    { background: #f2b179; color: #f9f6f2; }
.tile-v-16   { background: #f59563; color: #f9f6f2; }
.tile-v-32   { background: #f67c5f; color: #f9f6f2; }
.tile-v-64   { background: #f65e3b; color: #f9f6f2; }
.tile-v-128  { background: #edcf72; color: #f9f6f2; box-shadow: 0 0 20px rgba(237,207,114,0.9); }
.tile-v-256  { background: #edcc61; color: #f9f6f2; box-shadow: 0 0 24px rgba(237,204,97,0.95); }
.tile-v-512  { background: #edc850; color: #f9f6f2; box-shadow: 0 0 28px rgba(237,200,80,1); }
.tile-v-1024 { background: #edc53f; color: #f9f6f2; box-shadow: 0 0 32px rgba(237,197,63,1); }
.tile-v-2048 { background: #edc22e; color: #f9f6f2; box-shadow: 0 0 40px rgba(237,194,46,1); }

/* 2048 侧栏复用 info-card 样式，不需要额外定义 */

/* ====== Coin Toss 布局 ====== */
.coin-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.9));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.coin-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.coin-title h2 {
    margin: 0;
    font-size: 1.1rem;
}

.coin-title .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.coin-status {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.coin-main {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(240px, 0.9fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 880px) {
    .coin-main {
        grid-template-columns: 1fr;
    }
}

.coin-card {
    padding: 16px;
    border-radius: 18px;
    background: rgba(5,5,20,0.9);
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9);
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.coin-display {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.12);
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.1), var(--panel-accent));
    display: grid;
    place-items: center;
    box-shadow: 0 24px 80px rgba(0,0,0,0.8), inset 0 0 30px var(--panel-accent);
    position: relative;
    overflow: hidden;
    perspective: 1200px;
}

.coin-face {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 2.6rem;
    font-weight: 800;
    color: #0b0b20;
    background: linear-gradient(145deg, #ffd166, #fca311);
    box-shadow: 0 12px 40px rgba(0,0,0,0.6), inset 0 0 16px rgba(255,255,255,0.4);
    transition: transform 0.6s ease, box-shadow 0.6s ease;
    transform-style: preserve-3d;
    position: relative;
}

.coin-face::after {
    content: "";
    position: absolute;
    inset: -10%;
    background: linear-gradient(120deg, rgba(255,255,255,0.16), rgba(255,255,255,0));
    transform: translateX(-120%) rotate(18deg);
    border-radius: 50%;
    opacity: 0;
    pointer-events: none;
}

.coin-face.spin {
    animation: coinFlip 0.9s ease-in-out forwards;
    box-shadow: 0 18px 60px rgba(0,0,0,0.8), inset 0 0 22px rgba(255,255,255,0.55);
}

.coin-face.spin::after {
    animation: coinShine 0.9s ease forwards;
    opacity: 1;
}

@keyframes coinFlip {
    0% {
        transform: rotateY(0deg) translateY(0) scale(1);
    }
    30% {
        transform: rotateY(200deg) translateY(-6px) scale(1.05);
    }
    55% {
        transform: rotateY(380deg) translateY(-10px) scale(1.02);
    }
    80% {
        transform: rotateY(560deg) translateY(-4px) scale(1.04);
    }
    100% {
        transform: rotateY(720deg) translateY(0) scale(1);
    }
}

@keyframes coinShine {
    0% {
        transform: translateX(-120%) rotate(18deg);
        opacity: 0.1;
    }
    40% {
        transform: translateX(30%) rotate(18deg);
        opacity: 0.3;
    }
    100% {
        transform: translateX(140%) rotate(18deg);
        opacity: 0;
    }
}

.coin-message {
    margin: 0;
    color: var(--text-muted);
    text-align: center;
}

.coin-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

.coin-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.coin-history {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 240px;
    overflow: auto;
}

.coin-history li {
    padding: 6px 8px;
    border-radius: 10px;
    background: rgba(255,255,255,0.04);
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

.coin-history .side-heads {
    color: #ffd166;
    font-weight: 700;
}

.coin-history .side-tails {
    color: var(--accent);
    font-weight: 700;
}

/* ====== Tetris 布局 ====== */
.tetris-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.9));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.tetris-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.tetris-title h2 {
    margin: 0;
    font-size: 1.1rem;
}

.tetris-title .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tetris-status {
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.tetris-main {
    display: grid;
    grid-template-columns: minmax(280px, 1.7fr) minmax(240px, 0.9fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 900px) {
    .tetris-main {
        grid-template-columns: 1fr;
    }
}

.tetris-board-wrap {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(12,12,30,0.9), rgba(3,3,10,0.92));
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9);
}

#tetris-canvas {
    display: block;
    width: 100%;
    height: auto;
    background: radial-gradient(circle at 50% 15%, var(--panel-accent), rgba(5,5,20,0.96));
}

.tetris-overlay {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: linear-gradient(180deg, rgba(10,10,30,0.9), rgba(0,0,0,0.9));
    backdrop-filter: blur(3px);
    z-index: 2;
}

.tetris-overlay.visible {
    display: flex;
}

.tetris-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tetris-mode-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin: 6px 0;
}

.tetris-select {
    flex: 1;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.15);
    color: var(--text);
    border-radius: 10px;
    padding: 6px 10px;
    font-size: 0.9rem;
}

.tetris-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tetris-mini {
    width: 140px;
    height: 140px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.08);
    background: radial-gradient(circle at 40% 20%, rgba(255,255,255,0.08), rgba(10,10,20,0.92));
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.03);
}

.tetris-tags {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tetris-tags li {
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
    font-size: 0.8rem;
}

.tetris-energy-bar {
    width: 100%;
    height: 8px;
    border-radius: 999px;
    background: rgba(255,255,255,0.05);
    overflow: hidden;
    margin-top: 6px;
}

.tetris-energy-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-3), var(--accent-2));
    box-shadow: 0 0 14px rgba(255,255,255,0.25);
    transition: width 0.2s ease-out;
}

.tetris-ghost {
    opacity: 0.22;
}

.tetris-pulse {
    animation: tetrisPulse 0.18s ease-out;
}

@keyframes tetrisPulse {
    0% { transform: translateY(0); box-shadow: 0 18px 60px rgba(0,0,0,0.9); }
    40% { transform: translateY(-4px); box-shadow: 0 24px 80px rgba(255,255,255,0.16); }
    100% { transform: translateY(0); box-shadow: 0 18px 60px rgba(0,0,0,0.9); }
}

/* ====== Poker Odds 布局 ====== */

.poker-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.9));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.poker-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.poker-title h2 {
    margin: 0;
    font-size: 1.1rem;
}

.poker-title .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

.poker-main {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(240px, 0.9fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 960px) {
    .poker-main {
        grid-template-columns: 1fr;
    }
}

.poker-table {
    position: relative;
    padding: 18px;
    border-radius: 20px;
    background: radial-gradient(circle at 30% 20%, rgba(36, 104, 85, 0.35), rgba(6, 10, 22, 0.95));
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 22px 70px rgba(0,0,0,0.85);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.poker-table::before {
    content: "";
    position: absolute;
    inset: -60%;
    background:
    radial-gradient(circle at 30% 30%, rgba(90, 255, 210, 0.18), transparent 55%),
    repeating-linear-gradient(135deg, rgba(255,255,255,0.04) 0px, rgba(255,255,255,0.04) 1px, transparent 1px, transparent 14px);
    opacity: 0.45;
    pointer-events: none;
}

.poker-table > * {
    position: relative;
    z-index: 1;
}

.poker-row {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.poker-row-label {
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.poker-slot-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.poker-slot-row.board {
    gap: 10px;
}

.poker-slot-wrap {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: center;
}

.poker-slot-tag {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.poker-card-slot {
    width: 86px;
    height: 120px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.16);
    background: linear-gradient(160deg, rgba(255,255,255,0.08), rgba(8, 10, 24, 0.96));
    box-shadow: 0 16px 40px rgba(0,0,0,0.75);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--text);
    font-weight: 700;
    cursor: pointer;
    transition: transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
    position: relative;
}

.poker-card-slot::after {
    content: "";
    position: absolute;
    inset: 8px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.08);
    opacity: 0.45;
}

.poker-card-slot.small {
    width: 72px;
    height: 100px;
}

.poker-card-slot.empty {
    color: var(--text-muted);
    background: rgba(6, 8, 20, 0.92);
}

.poker-card-slot.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(90,170,255,0.4), 0 18px 50px rgba(0,0,0,0.85);
    transform: translateY(-2px);
}

.poker-card-placeholder {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.poker-card-rank {
    font-size: 1.4rem;
}

.poker-card-slot.small .poker-card-rank {
    font-size: 1.1rem;
}

.poker-card-suit {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
}

.suit-heart,
.suit-diamond {
    color: #ff8fa1;
}

.suit-spade,
.suit-club {
    color: #e6ecff;
}

.poker-hint {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.poker-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.poker-progress {
    height: 6px;
    border-radius: 999px;
    background: rgba(255,255,255,0.08);
    overflow: hidden;
}

.poker-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-3), var(--accent-2));
    transition: width 0.2s ease-out;
}

.poker-results {
    display: grid;
    grid-template-columns: minmax(180px, 0.7fr) minmax(0, 1fr);
    gap: 16px;
    align-items: center;
}

@media (max-width: 960px) {
    .poker-results {
        grid-template-columns: 1fr;
    }

    .poker-equity {
        align-items: flex-start;
        text-align: left;
    }
}

.poker-equity {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-align: center;
}

.equity-ring {
    --equity: 0%;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: conic-gradient(var(--accent) var(--equity), rgba(255,255,255,0.08) 0);
    display: grid;
    place-items: center;
    position: relative;
    box-shadow: 0 18px 60px rgba(0,0,0,0.8);
}

.equity-ring::after {
    content: "";
    position: absolute;
    inset: 12px;
    border-radius: 50%;
    background: rgba(5, 7, 20, 0.95);
    border: 1px solid rgba(255,255,255,0.08);
}

.equity-ring > * {
    position: relative;
    z-index: 1;
}

.equity-value {
    font-size: 1.6rem;
    font-weight: 700;
}

.equity-label {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.equity-sub {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.poker-stats {
    display: grid;
    gap: 10px;
}

.poker-stat-card {
    padding: 10px 12px;
    border-radius: 14px;
    background: var(--bg-panel);
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 14px 40px rgba(0,0,0,0.7);
}

.stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.stat-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 700;
}

.stat-bar {
    height: 6px;
    border-radius: 999px;
    background: rgba(255,255,255,0.08);
    overflow: hidden;
    margin-top: 8px;
}

.stat-fill {
    height: 100%;
    width: 0%;
    transition: width 0.25s ease-out;
}

.stat-fill.win {
    background: linear-gradient(90deg, var(--accent), var(--accent-3));
}

.stat-fill.tie {
    background: linear-gradient(90deg, var(--accent-3), var(--accent-soft-2));
}

.stat-fill.lose {
    background: linear-gradient(90deg, var(--accent-2), rgba(255,255,255,0.2));
}

.poker-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.poker-control {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
}

.poker-control-actions {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
}

.poker-select {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.18);
    color: var(--text);
    border-radius: 10px;
    padding: 6px 10px;
    font-size: 0.9rem;
}

.poker-select:focus-visible {
    box-shadow: 0 0 0 2px rgba(255,255,255,0.2);
    outline: none;
}

#poker-iterations {
    width: 100%;
    accent-color: var(--accent);
}

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

.poker-deck {
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.poker-deck-row {
    display: grid;
    grid-template-columns: 26px repeat(13, minmax(28px, 1fr));
    gap: 6px;
    align-items: center;
}

.poker-deck-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

.poker-card-btn {
    width: 100%;
    height: 36px;
    border-radius: 10px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--text);
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.poker-card-btn:hover {
    transform: translateY(-1px);
    border-color: rgba(255,255,255,0.3);
}

.poker-card-btn.is-used {
    opacity: 0.3;
    cursor: not-allowed;
    box-shadow: none;
}

.poker-deck.disabled {
    opacity: 0.5;
    pointer-events: none;
}

@media (max-width: 640px) {
    .poker-slot-row {
        justify-content: center;
    }

    .poker-actions {
        justify-content: center;
    }
}

/* ====== Sudoku 布局 ====== */

.sudoku-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.92));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: relative;
    overflow: hidden;
}

.sudoku-layout::before {
    content: "";
    position: absolute;
    inset: -40%;
    background: conic-gradient(from 90deg,
    var(--panel-accent),
    var(--panel-accent-2),
    var(--panel-accent-3),
    var(--panel-accent));
    opacity: 0.45;
    filter: blur(40px);
    animation: sudokuAura 18s linear infinite;
    pointer-events: none;
}

.sudoku-layout > * {
    position: relative;
    z-index: 1;
}

.sudoku-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.sudoku-title h2 {
    margin: 0;
    font-size: 1.1rem;
}

.sudoku-title .subtitle {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.sudoku-status {
    display: inline-flex;
    gap: 8px;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.sudoku-main {
    display: flex;
    gap: 18px;
    align-items: stretch;
}

.sudoku-board-wrap {
    position: relative;
}

.sudoku-board {
    --sudoku-cell: clamp(34px, 5.2vw, 56px);
    display: grid;
    grid-template-columns: repeat(9, var(--sudoku-cell));
    grid-template-rows: repeat(9, var(--sudoku-cell));
    gap: 0;
    padding: 12px;
    border-radius: 20px;
    background: radial-gradient(circle at top, rgba(16,18,42,0.96), rgba(4,5,16,0.96));
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.8);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.sudoku-board::before {
    content: "";
    position: absolute;
    inset: -60%;
    background: conic-gradient(from 180deg,
    var(--panel-accent),
    var(--panel-accent-2),
    var(--panel-accent-3),
    var(--panel-accent));
    opacity: 0.12;
    animation: sudokuSpin 20s linear infinite;
    pointer-events: none;
}

.sudoku-board.loading {
    filter: saturate(0.6) brightness(0.85);
}

.sudoku-cell {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: #dfe6ff;
    background: var(--bg-panel);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: background var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast), transform var(--transition-fast);
    z-index: 1;
    cursor: pointer;
}

.sudoku-value {
    position: relative;
    z-index: 2;
}

.sudoku-notes {
    position: absolute;
    inset: 4px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    font-size: 0.5rem;
    color: rgba(255,255,255,0.55);
    text-shadow: 0 0 6px var(--panel-accent);
    z-index: 1;
    pointer-events: none;
}

.sudoku-notes span {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.9);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.sudoku-notes span.active {
    opacity: 1;
    transform: scale(1);
}

.sudoku-cell.has-value .sudoku-notes {
    opacity: 0;
}

.sudoku-board.note-mode .sudoku-cell.selected {
    background: var(--accent-3-soft);
    box-shadow: inset 0 0 0 2px var(--accent-3-glow), 0 0 18px var(--accent-3-soft);
}

.sudoku-cell::after {
    content: "";
    position: absolute;
    inset: 2px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0));
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.sudoku-cell:hover::after {
    opacity: 1;
}

.sudoku-cell.given {
    color: #ffffff;
    font-weight: 700;
    text-shadow: 0 0 12px var(--accent-glow);
}

.sudoku-cell.hinted {
    color: var(--accent-3);
    text-shadow: 0 0 12px var(--accent-3-glow);
}

.sudoku-cell.selected {
    background: var(--accent-glow-soft);
    box-shadow: inset 0 0 0 2px var(--accent-glow), 0 0 18px var(--accent-glow-soft);
}

.sudoku-cell.peer {
    background: var(--accent-soft);
}

.sudoku-cell.same-value {
    color: #ffe47a;
    text-shadow: 0 0 12px rgba(255,228,122,0.9);
}

.sudoku-cell.error {
    color: #ff6b6b;
    box-shadow: inset 0 0 0 2px rgba(255,107,107,0.85), 0 0 18px rgba(255,107,107,0.6);
}

.sudoku-cell.cage-peer {
    background: var(--accent-3-soft);
}

.sudoku-cell.cage-error {
    background: rgba(255,107,107,0.14);
}

.sudoku-cell.has-cage-sum::before {
    content: attr(data-sum);
    position: absolute;
    top: 4px;
    left: 6px;
    font-size: 0.55rem;
    color: rgba(255,255,255,0.65);
    letter-spacing: 0.03em;
    z-index: 3;
    pointer-events: none;
}

.sudoku-cell.cage-error.has-cage-sum::before {
    color: rgba(255,180,180,0.9);
}

.sudoku-cell.sudoku-block-right {
    border-right: 2px solid rgba(255,255,255,0.35);
}

.sudoku-cell.sudoku-block-bottom {
    border-bottom: 2px solid rgba(255,255,255,0.35);
}

.sudoku-cell.cage-top {
    border-top: 2px solid rgba(255,255,255,0.5);
}

.sudoku-cell.cage-right {
    border-right: 2px solid rgba(255,255,255,0.5);
}

.sudoku-cell.cage-bottom {
    border-bottom: 2px solid rgba(255,255,255,0.5);
}

.sudoku-cell.cage-left {
    border-left: 2px solid rgba(255,255,255,0.5);
}

.sudoku-cell.pop {
    animation: sudokuPop 0.22s ease;
}

.sudoku-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(5,5,16,0.7);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-med);
    z-index: 6;
}

.sudoku-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.sudoku-sidebar {
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sudoku-control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.sudoku-control-row .btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-3));
    border-color: transparent;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.sudoku-pad {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
}

.sudoku-pad .btn {
    justify-content: center;
}

.sudoku-pad .sudoku-erase {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.25);
}

@media (max-width: 980px) {
    .sudoku-main {
        flex-direction: column;
    }

    .sudoku-sidebar {
        width: 100%;
    }
}

@keyframes sudokuAura {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes sudokuSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes sudokuPop {
    0% { transform: scale(0.92); }
    70% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes ambientFloat {
    0% { transform: translate3d(0, 0, 0) scale(1); }
    50% { transform: translate3d(2%, -3%, 0) scale(1.04); }
    100% { transform: translate3d(0, 0, 0) scale(1); }
}

@keyframes ambientSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes textureDrift {
    0% { background-position: 0 0, 0 0, 20% 20%, 80% 10%, 50% 80%; }
    50% { background-position: 40px -60px, -30px 20px, 18% 22%, 82% 12%, 52% 78%; }
    100% { background-position: 0 0, 0 0, 20% 20%, 80% 10%, 50% 80%; }
}

/* Screen transition handled via @keyframes screenIn above */

/* 可选：按钮按下的小压感 */
.btn.pressed {
    transform: translateY(1px) scale(0.97);
    box-shadow: none;
}

/* 确保背景伪元素不挡住鼠标事件 */
.app-shell::before,
.app-shell::after {
    pointer-events: none;
}

/* =====================================================
   BEAUTIFICATION LAYER — Animations & Visual Upgrades
   ===================================================== */

/* ---- Header: animated title glow ---- */
.app-header h1 {
    background: linear-gradient(90deg, var(--accent), var(--accent-3), var(--accent-2), var(--accent));
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGradient 6s linear infinite;
    text-shadow: none;
}

@keyframes titleGradient {
    0%   { background-position: 0% 50%; }
    100% { background-position: 300% 50%; }
}

/* ---- Game card entrance stagger ---- */
.game-grid {
    animation: gridFadeIn 0.4s ease-out both;
}

@keyframes gridFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.game-card:nth-child(1) { animation: cardEnter 0.5s 0.05s ease-out both; }
.game-card:nth-child(2) { animation: cardEnter 0.5s 0.12s ease-out both; }
.game-card:nth-child(3) { animation: cardEnter 0.5s 0.19s ease-out both; }
.game-card:nth-child(4) { animation: cardEnter 0.5s 0.26s ease-out both; }
.game-card:nth-child(5) { animation: cardEnter 0.5s 0.33s ease-out both; }
.game-card:nth-child(6) { animation: cardEnter 0.5s 0.40s ease-out both; }
.game-card:nth-child(7) { animation: cardEnter 0.5s 0.47s ease-out both; }

@keyframes cardEnter {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---- Game card: animated neon shimmer border on hover ---- */
.game-card {
    background: radial-gradient(circle at top left, var(--accent-soft), var(--bg-elevated));
    /* Add pulsing inner glow */
    transition: transform var(--transition-med), box-shadow var(--transition-med),
                border-color var(--transition-med), background var(--transition-med);
}

.game-card:hover {
    background: radial-gradient(circle at top left, var(--accent-glow-soft), var(--bg-elevated));
    box-shadow: 0 32px 90px rgba(0,0,0,0.85), 0 0 0 1px var(--accent-glow-soft),
                inset 0 0 30px rgba(255,255,255,0.03);
}

/* ---- Card play buttons: ripple effect ---- */
.btn.primary {
    position: relative;
    overflow: hidden;
}

.btn.primary::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(255,255,255,0.25) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: inherit;
}

.btn.primary:hover::after {
    opacity: 1;
}

.btn.primary:active {
    transform: scale(0.96) translateY(1px);
}

/* ---- Game tags: glow chip ---- */
.game-tags li {
    transition: background var(--transition-fast), color var(--transition-fast);
    background: rgba(255,255,255,0.05);
}

.game-card:hover .game-tags li {
    background: var(--accent-soft);
    color: var(--accent);
}

/* ---- Info cards: subtle entrance animation when game screen is shown ---- */
.info-card {
    transition: transform var(--transition-med), box-shadow var(--transition-med);
    animation: infoCardIn 0.4s ease-out both;
}

@keyframes infoCardIn {
    from { opacity: 0; transform: translateX(8px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ---- Header: floating glow orbs ---- */
.app-header {
    position: relative;
    overflow: hidden;
    animation: headerAppear 0.6s ease-out both;
}

@keyframes headerAppear {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.app-header::before {
    content: "";
    position: absolute;
    width: 200px; height: 200px;
    background: radial-gradient(circle, var(--accent-glow-soft) 0%, transparent 70%);
    top: -60px; left: 30%;
    animation: orbDrift 8s ease-in-out infinite alternate;
    pointer-events: none;
    opacity: 0.6;
}

@keyframes orbDrift {
    from { transform: translateX(-30px) scale(1); }
    to   { transform: translateX(30px) scale(1.2); }
}

/* ---- Ambient animation keyframes (referenced in body::before) ---- */
@keyframes ambientFloat {
    0%   { transform: translate(0, 0) rotate(0deg); }
    33%  { transform: translate(-3%, 2%) rotate(4deg); }
    66%  { transform: translate(2%, -2%) rotate(-3deg); }
    100% { transform: translate(0, 0) rotate(0deg); }
}

@keyframes textureDrift {
    from { background-position: 0 0, 0 0, 0 0, 0 0, 0 0; }
    to   { background-position: 100px 60px, 80px 40px, 0 0, 0 0, 0 0; }
}

@keyframes ambientSpin {
    from { transform: rotate(0deg) scale(1.1); }
    to   { transform: rotate(360deg) scale(1.1); }
}

/* ---- Sudoku animation ---- */
@keyframes sudokuAura {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

/* ---- Coin card extra depth ---- */
.coin-card {
    transition: box-shadow var(--transition-med);
}

.coin-card:hover {
    box-shadow: 0 28px 80px rgba(0,0,0,0.95),
                0 0 0 1px var(--accent-glow-soft),
                inset 0 0 40px var(--accent-soft);
}

.coin-display {
    transition: box-shadow var(--transition-med), transform var(--transition-med);
    animation: coinOrbit 6s ease-in-out infinite;
}

@keyframes coinOrbit {
    0%, 100% { box-shadow: 0 24px 80px rgba(0,0,0,0.8), inset 0 0 30px var(--panel-accent); }
    50%       { box-shadow: 0 32px 100px rgba(0,0,0,0.85), inset 0 0 50px var(--accent-soft-2); }
}

/* ---- Coin: after result flash ---- */
.coin-face[data-side="heads"] {
    background: linear-gradient(145deg, #ffd166, #fca311);
    box-shadow: 0 14px 50px rgba(252,163,17,0.6), inset 0 0 18px rgba(255,255,255,0.5);
}

.coin-face[data-side="tails"] {
    background: linear-gradient(145deg, #7ef9ff, #5aaaff);
    color: #020212;
    box-shadow: 0 14px 50px rgba(90,170,255,0.5), inset 0 0 18px rgba(255,255,255,0.4);
}

/* ---- Poker table: better card slot hover ---- */
.poker-card-slot {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast),
                border-color var(--transition-fast), background var(--transition-fast);
    animation: none;
}

.poker-card-slot:hover:not([disabled]) {
    border-color: var(--accent-glow-soft);
    box-shadow: 0 0 16px var(--accent-glow-soft);
}

.poker-card-slot.slot-active {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow-soft), 0 0 40px rgba(90,170,255,0.15);
    animation: slotPulse 1.2s ease-in-out infinite;
}

@keyframes slotPulse {
    0%, 100% { box-shadow: 0 0 16px var(--accent-glow-soft); }
    50%       { box-shadow: 0 0 28px var(--accent-glow), 0 0 50px rgba(90,170,255,0.2); }
}

.poker-card-btn:hover:not(.is-used) {
    background: var(--accent-soft);
    border-color: var(--accent-glow-soft);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.4);
}

.poker-card-btn.selected {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

/* ---- Equity ring animation ---- */
.equity-ring {
    transition: box-shadow var(--transition-med);
    animation: ringPulse 4s ease-in-out infinite;
}

@keyframes ringPulse {
    0%, 100% { box-shadow: 0 0 20px var(--accent-glow-soft); }
    50%       { box-shadow: 0 0 40px var(--accent-glow-soft), 0 0 80px rgba(90,170,255,0.1); }
}

/* ---- Progress & energy bars: animated fill ---- */
.tetris-energy-fill {
    background: linear-gradient(90deg, var(--accent), var(--accent-3), var(--accent-2));
    background-size: 200% 100%;
    animation: energyFlow 2s linear infinite;
}

@keyframes energyFlow {
    from { background-position: 0% 0%; }
    to   { background-position: 200% 0%; }
}

/* ---- Snake canvas: breathing glow ---- */
#snake-canvas {
    animation: canvasGlow 4s ease-in-out infinite;
}

@keyframes canvasGlow {
    0%, 100% { box-shadow: 0 18px 60px rgba(0,0,0,0.9), 0 0 0 1px var(--accent-glow-soft); }
    50%       { box-shadow: 0 24px 80px rgba(0,0,0,0.95), 0 0 20px var(--accent-glow-soft); }
}

/* ---- Tetris canvas: same ---- */
#tetris-canvas {
    animation: canvasGlow 4s 1s ease-in-out infinite;
}

/* ====== Shooter Game Layout ====== */
body[data-game="shooter"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
}

.shooter-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.92));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.shooter-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.shooter-title h2 { margin: 0; font-size: 1.1rem; }
.shooter-title .subtitle { font-size: 0.8rem; color: var(--text-muted); }
.shooter-status { font-size: 0.85rem; color: var(--text-muted); }

.shooter-main {
    display: grid;
    grid-template-columns: minmax(300px, 1.4fr) minmax(220px, 0.9fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 900px) {
    .shooter-main { grid-template-columns: 1fr; }
}

.shooter-board-wrap {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    background: #020212;
    border: 1px solid var(--accent-glow-soft);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9), 0 0 30px rgba(90,170,255,0.15);
    animation: canvasGlow 3s ease-in-out infinite;
}

#shooter-canvas {
    display: block;
    width: 100%;
    height: auto;
}

.shooter-overlay {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: linear-gradient(180deg, rgba(2,2,18,0.9), rgba(0,0,0,0.92));
    backdrop-filter: blur(4px);
    z-index: 2;
}

.shooter-overlay.visible { display: flex; }

.shooter-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.shooter-control {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
}

/* ============================================================
   XIANGQI
   ============================================================ */
.xiangqi-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.92));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.xiangqi-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.xiangqi-title h2 { margin: 0; font-size: 1.1rem; }
.xiangqi-title .subtitle { font-size: 0.8rem; color: var(--text-muted); }
.xiangqi-status-wrap { font-size: 0.9rem; color: var(--text-muted); }

.xiangqi-main {
    display: grid;
    grid-template-columns: minmax(300px, 1.2fr) minmax(220px, 0.8fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 960px) {
    .xiangqi-main { grid-template-columns: 1fr; }
}

.xiangqi-board-wrap {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    background: #020212;
    border: 1px solid var(--accent-glow-soft);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9), 0 0 30px rgba(90,170,255,0.15);
    animation: canvasGlow 3s ease-in-out infinite;
}

#xiangqi-canvas {
    display: block;
    width: 100%;
    height: auto;
}

.xiangqi-overlay {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: linear-gradient(180deg, rgba(2,2,18,0.9), rgba(0,0,0,0.92));
    backdrop-filter: blur(4px);
    z-index: 2;
}

.xiangqi-overlay.visible { display: flex; }

.xiangqi-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.xiangqi-control {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
}

/* ====== Chess ====== */
.chess-layout {
    margin-top: 8px;
    padding: 16px;
    border-radius: 20px;
    background: radial-gradient(circle at top, var(--panel-accent), rgba(0,0,0,0.92));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.chess-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    flex-wrap: wrap;
}

.chess-title h2 { margin: 0; font-size: 1.1rem; }
.chess-title .subtitle { font-size: 0.8rem; color: var(--text-muted); }
.chess-status-wrap { font-size: 0.9rem; color: var(--text-muted); }

.chess-main {
    display: grid;
    grid-template-columns: 640px minmax(220px, 1fr);
    gap: 16px;
    align-items: start;
}

@media (max-width: 960px) {
    .chess-main { grid-template-columns: 1fr; }
}

.chess-board-wrap {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    background: #020212;
    border: 1px solid var(--accent-glow-soft);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9), 0 0 30px rgba(0,255,231,0.12);
    animation: canvasGlow 3s ease-in-out infinite;
    width: 640px;
    height: 640px;
}

#chess-canvas {
    display: block;
    width: 640px;
    height: 640px;
}

.chess-overlay {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: linear-gradient(180deg, rgba(2,2,18,0.9), rgba(0,0,0,0.92));
    backdrop-filter: blur(4px);
    z-index: 2;
}

.chess-overlay.visible { display: flex; }

.chess-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chess-move-entry {
    padding: 2px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    white-space: pre;
}

/* =====================================================================
   NEW UNIFIED LAYOUT SYSTEM
   Replaces old per-game layout classes. All game screens now use these.
   ===================================================================== */

/* ---------- Header inner layout ---------- */

.header-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: grid;
    place-items: center;
    font-size: 1.4rem;
    flex-shrink: 0;
    box-shadow: 0 8px 24px var(--accent-glow-soft), inset 0 1px 0 rgba(255,255,255,0.25);
    animation: brandPulse 4s ease-in-out infinite;
}

@keyframes brandPulse {
    0%, 100% { box-shadow: 0 8px 24px var(--accent-glow-soft); transform: rotate(0deg); }
    50%       { box-shadow: 0 12px 36px var(--accent-glow-soft), 0 0 20px var(--accent-soft); transform: rotate(12deg); }
}

.brand-text h1 {
    font-size: 1.3rem;
    margin: 0;
}

.brand-sub {
    margin: 2px 0 0;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.theme-picker {
    display: flex;
    align-items: center;
    gap: 8px;
}

.ctrl-label {
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
    white-space: nowrap;
}

.theme-swatches {
    display: flex;
    gap: 6px;
    align-items: center;
}

.swatch {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.18);
    cursor: pointer;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
    padding: 0;
    outline: none;
}

.swatch[data-theme="nebula"]  { background: #5aaaff; }
.swatch[data-theme="solaris"] { background: #ff9f43; }
.swatch[data-theme="aqua"]    { background: #4bdcff; }
.swatch[data-theme="ember"]   { background: #ff7b54; }
.swatch[data-theme="verdant"] { background: #47e08b; }

.swatch:hover {
    transform: scale(1.25);
    border-color: rgba(255,255,255,0.45);
}

.swatch.active {
    transform: scale(1.3);
    border-color: rgba(255,255,255,0.7);
    box-shadow: 0 0 10px currentColor, 0 0 20px var(--accent-glow-soft);
}

.ctrl-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.16);
    background: rgba(255,255,255,0.04);
    color: var(--text);
    font-size: 0.82rem;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
}

.ctrl-btn:hover {
    background: rgba(255,255,255,0.09);
    border-color: rgba(255,255,255,0.3);
}

.ctrl-btn-icon { font-size: 0.85rem; }
.ctrl-btn-label { font-size: 0.82rem; }

@media (max-width: 600px) {
    .app-header { padding: 10px 14px; }
    .brand-icon { width: 36px; height: 36px; font-size: 1.1rem; border-radius: 10px; }
    .brand-text h1 { font-size: 1.05rem; }
    .ctrl-label { display: none; }
}

/* ---------- Menu hero & categories ---------- */

.menu-hero {
    text-align: center;
    padding: 20px 0 8px;
}

.menu-hero-label {
    margin: 0 0 8px;
    font-size: 0.68rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.menu-hero-title {
    margin: 0;
    font-size: clamp(1.75rem, 4.5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    line-height: 1.15;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-3), var(--accent-2));
    background-size: 200% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGradient 5s linear infinite;
}

.category-section {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.category-label {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-muted);
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

/* ---------- Game card new inner classes ---------- */

.game-card { cursor: pointer; }

.card-glow {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(circle at 40% 30%, var(--accent-glow-soft), transparent 65%);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-med);
    z-index: 0;
}

.game-card:hover .card-glow { opacity: 1; }

.card-icon {
    font-size: 2.1rem;
    line-height: 1;
    position: relative;
    z-index: 1;
}

.card-body {
    flex: 1;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.card-title {
    margin: 0 0 5px;
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.3;
}

.card-desc {
    margin: 0 0 10px;
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.55;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.tag {
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
    font-size: 0.7rem;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.game-card:hover .tag {
    background: var(--accent-soft);
    color: var(--accent);
}

.card-play {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--accent-soft);
    border: 1px solid var(--accent-glow-soft);
    display: grid;
    place-items: center;
    flex-shrink: 0;
    align-self: flex-end;
    position: relative;
    z-index: 1;
    transition: background var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.game-card:hover .card-play {
    background: var(--accent);
    box-shadow: 0 0 18px var(--accent-glow);
    transform: scale(1.15);
}

.play-arrow {
    font-size: 0.75rem;
    color: var(--accent);
    transition: color var(--transition-fast);
}

.game-card:hover .play-arrow { color: #fff; }

/* ---------- Unified game screen layout ---------- */

.game-layout {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.game-topbar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--header-grad-start), var(--header-grad-end));
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 6px 22px rgba(0,0,0,0.38);
    flex-wrap: wrap;
}

.back-btn {
    flex-shrink: 0;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.16);
    background: rgba(255,255,255,0.04);
    color: var(--text);
    font-size: 0.84rem;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.back-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.3);
}

.game-topbar-title {
    flex: 1;
    min-width: 0;
}

.game-topbar-title h2 {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.game-topbar-title .subtitle {
    font-size: 0.72rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-badge {
    padding: 3px 12px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.77rem;
    font-weight: 600;
    border: 1px solid var(--accent-glow-soft);
    white-space: nowrap;
    flex-shrink: 0;
}

.topbar-badges {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    flex-shrink: 0;
}

/* canvas-layout: canvas left, sidebar right */
.canvas-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: 14px;
    align-items: start;
}

@media (max-width: 960px) {
    .canvas-layout { grid-template-columns: 1fr; }
}

.game-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* board-canvas-wrap: relative container for canvas + overlay */
.board-canvas-wrap {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    background: #020212;
    border: 1px solid var(--accent-glow-soft);
    box-shadow: 0 16px 52px rgba(0,0,0,0.9), 0 0 28px rgba(90,170,255,0.1);
    animation: canvasGlow 4s ease-in-out infinite;
}

.board-canvas-wrap canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

/* *** CRITICAL BUG FIX: overlay must be hidden by default *** */
.board-overlay {
    position: absolute;
    inset: 0;
    display: none;           /* ← hidden until .visible is added */
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: linear-gradient(180deg, rgba(2,2,20,0.92), rgba(0,0,0,0.94));
    backdrop-filter: blur(7px);
    z-index: 10;
}

.board-overlay.visible {
    display: flex;
}

/* ---------- info-card inner helpers ---------- */

.info-label {
    display: block;
    font-size: 0.67rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.muted-sm {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 2px 0;
    line-height: 1.55;
}

.big-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    margin: 4px 0 2px;
    text-shadow: 0 0 20px var(--accent-glow-soft);
    line-height: 1.05;
}

.info-card.score-card {
    border-color: var(--accent-glow-soft);
    background: radial-gradient(circle at top left, var(--accent-soft), var(--bg-panel));
}

/* btn-group */
.btn-group {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    margin-top: 4px;
}

.btn-group .btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-3));
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(0,0,0,0.45);
    color: #fff;
}

/* sm alias */
.btn.sm {
    font-size: 0.78rem;
    padding: 4px 10px;
}

/* full-width button */
.btn.full {
    width: 100%;
    justify-content: center;
}

/* field-row */
.field-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 4px 0;
}

/* game-select */
.game-select {
    flex: 1;
    min-width: 0;
    background: rgba(5,7,22,0.72);
    border: 1px solid rgba(255,255,255,0.14);
    color: var(--text);
    border-radius: 10px;
    padding: 5px 10px;
    font-size: 0.82rem;
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.game-select:focus-visible {
    border-color: var(--accent-glow-soft);
    box-shadow: 0 0 0 2px rgba(90,170,255,0.14);
}

/* tag-list */
.tag-list {
    list-style: none;
    padding: 0;
    margin: 6px 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.tag-list li {
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* checkbox row */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    font-size: 0.82rem;
}

.checkbox-row input[type="checkbox"] {
    accent-color: var(--accent);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

/* move history */
.move-history {
    max-height: 180px;
    overflow-y: auto;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: monospace;
    line-height: 1.6;
}

/* ---------- Coin game specific ---------- */

.coin-layout-inner {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) 268px;
    gap: 14px;
    align-items: start;
}

@media (max-width: 800px) {
    .coin-layout-inner { grid-template-columns: 1fr; }
}

.coin-stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 28px 20px;
    border-radius: 18px;
    background: rgba(5,5,20,0.92);
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 18px 60px rgba(0,0,0,0.9);
}

/* ---------- Sudoku game specific ---------- */

.sudoku-layout-inner {
    display: flex;
    gap: 18px;
    align-items: start;
}

@media (max-width: 960px) {
    .sudoku-layout-inner { flex-direction: column; }
}

.sudoku-layout-inner > .sudoku-board-wrap {
    flex-shrink: 0;
}

/* ---------- Poker game specific ---------- */

.poker-layout-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) 268px;
    gap: 14px;
    align-items: start;
}

@media (max-width: 900px) {
    .poker-layout-inner { grid-template-columns: 1fr; }
}

/* ---------- Missing game data-game states ---------- */

body[data-game="gomoku"] {
    --panel-accent: var(--accent-soft);
    --panel-accent-2: var(--accent-soft-2);
    --panel-accent-3: var(--accent-3-soft);
}

body[data-game="xiangqi"] {
    --panel-accent: var(--accent-soft-2);
    --panel-accent-2: var(--accent-soft);
    --panel-accent-3: var(--accent-3-soft);
}

body[data-game="chess"] {
    --panel-accent: var(--accent-3-soft);
    --panel-accent-2: var(--accent-soft);
    --panel-accent-3: var(--accent-soft-2);
}

/* ---------- Responsive: phone ---------- */

@media (max-width: 600px) {
    .game-topbar {
        padding: 8px 12px;
        gap: 8px;
        border-radius: 12px;
    }

    .game-topbar-title h2 {
        font-size: 0.95rem;
    }

    .game-topbar-title .subtitle {
        display: none;
    }

    .back-btn {
        padding: 5px 10px;
        font-size: 0.78rem;
    }

    .topbar-badge {
        font-size: 0.72rem;
        padding: 2px 8px;
    }

    .big-num {
        font-size: 1.65rem;
    }

    .info-card {
        padding: 8px 10px;
    }

    .game-grid {
        grid-template-columns: 1fr;
    }

    .menu-hero {
        padding: 10px 0 4px;
    }

    .menu-hero-title {
        font-size: 1.8rem;
    }
}

/* ---------- Scrollbar styling ---------- */

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.03);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb {
    background: var(--accent-glow-soft);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-soft);
}