/* ==========================================================================
   2048 ULTIMATE - STYLE SHEET
   ========================================================================== */

/* --- CSS Variables & Themes --- */
:root {
    /* Fonts */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    --font-accent: Arial, Helvetica, sans-serif;

    /* Spacing & Board Config */
    --board-width: 500px;
    --grid-gap: 12px;
    --grid-size: 4;
    --tile-size: calc((100% - (var(--grid-size) + 1) * var(--grid-gap)) / var(--grid-size));

    /* Global Transitions */
    --transition-speed: 150ms;
    --transition-curve: cubic-bezier(0.25, 1, 0.5, 1);
}

/* Light Theme Variables */
html[data-theme="light"] {
    --bg-primary: #F5F7FA;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #E4E7EB;
    
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-inverse: #FFFFFF;
    
    --board-bg: #BBADA0;
    --cell-bg: rgba(238, 228, 218, 0.4);
    
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --board-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
    --input-border: #CBD5E1;
    --input-focus: #3B82F6;
    
    /* Button Themes */
    --btn-primary-bg: #8F7A66;
    --btn-primary-text: #FFFFFF;
    --btn-primary-hover: #7F6A56;
    
    --btn-secondary-bg: #E2E8F0;
    --btn-secondary-text: #475569;
    --btn-secondary-hover: #CBD5E1;
}

/* Dark Theme Variables */
html[data-theme="dark"] {
    --bg-primary: #0B0F19;
    --bg-secondary: #151D30;
    --bg-tertiary: #1E293B;
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-inverse: #0B0F19;
    
    --board-bg: #1F2937;
    --cell-bg: rgba(255, 255, 255, 0.05);
    
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --board-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --input-border: #334155;
    --input-focus: #3B82F6;
    
    /* Button Themes */
    --btn-primary-bg: #3B82F6;
    --btn-primary-text: #FFFFFF;
    --btn-primary-hover: #2563EB;
    
    --btn-secondary-bg: #334155;
    --btn-secondary-text: #F8FAFC;
    --btn-secondary-hover: #475569;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* --- Layout Container --- */
.app-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* --- Header Section --- */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.logo {
    font-family: var(--font-accent);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--btn-primary-bg);
    letter-spacing: -2px;
}

.logo-sub {
    font-size: 1.2rem;
    font-family: var(--font-primary);
    font-weight: 800;
    letter-spacing: 2px;
    margin-left: 8px;
    background: linear-gradient(135deg, #FF9900, #FF5E00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.score-container {
    display: flex;
    gap: 10px;
}

.score-card {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    padding: 12px 20px;
    min-width: 100px;
    text-align: center;
    position: relative;
    box-shadow: var(--card-shadow);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--cell-bg);
}

.score-title {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.score-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    font-family: var(--font-accent);
}

/* Floating addition points overlay */
.score-addition {
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.1rem;
    font-weight: 800;
    color: #10B981;
    font-family: var(--font-accent);
    pointer-events: none;
    opacity: 0;
    animation: none;
}

@keyframes score-add {
    0% {
        transform: translate(-50%, 0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -40px);
        opacity: 0;
    }
}

/* --- Control Bar --- */
.control-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 15px 20px;
    margin-bottom: 25px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--cell-bg);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Dropdown styling */
.select-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.select-wrapper label {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select {
    appearance: none;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    padding: 8px 36px 8px 16px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
}

select:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Button UI */
.btn {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 0.95rem;
    padding: 10px 20px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all 0.2s var(--transition-curve);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
}

.btn-primary:hover {
    background-color: var(--btn-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
}

.btn-secondary:hover {
    background-color: var(--btn-secondary-hover);
    transform: translateY(-2px);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
    border-radius: 8px;
}

/* Icon Button (Theme toggle) */
.icon-btn {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background-color: var(--btn-secondary-hover);
    transform: scale(1.05);
}

/* Display sun/moon based on theme */
html[data-theme="light"] .sun-icon { display: none; }
html[data-theme="light"] .moon-icon { display: block; color: var(--text-secondary); }
html[data-theme="dark"] .sun-icon { display: block; color: #F59E0B; }
html[data-theme="dark"] .moon-icon { display: none; }

/* --- Main Layout Section --- */
.main-layout {
    display: grid;
    grid-template-columns: var(--board-width) 1fr;
    gap: 40px;
    align-items: start;
    margin-bottom: 40px;
}

/* --- Left Column: Game Section --- */
.game-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.board-wrapper {
    position: relative;
    width: var(--board-width);
    height: var(--board-width);
}

/* --- THE GAME BOARD --- */
.game-board {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: var(--board-bg);
    border-radius: 16px;
    padding: var(--grid-gap);
    box-shadow: var(--board-shadow);
    user-select: none;
    touch-action: none;
    overflow: hidden;
}

/* Grid Cell Configs per size */
.game-board[data-size="3"] { --grid-size: 3; --grid-gap: 14px; }
.game-board[data-size="4"] { --grid-size: 4; --grid-gap: 12px; }
.game-board[data-size="5"] { --grid-size: 5; --grid-gap: 10px; }
.game-board[data-size="6"] { --grid-size: 6; --grid-gap: 8px; }

/* Static Grid Background Layer */
.grid-background {
    display: grid;
    grid-template-columns: repeat(var(--grid-size), 1fr);
    grid-template-rows: repeat(var(--grid-size), 1fr);
    gap: var(--grid-gap);
    width: 100%;
    height: 100%;
}

.grid-cell {
    background-color: var(--cell-bg);
    border-radius: 8px;
    width: 100%;
    height: 100%;
}

/* --- THE FLOATING DYNAMIC TILES --- */
.tile-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: none;
}

.tile {
    position: absolute;
    width: var(--tile-size);
    height: var(--tile-size);
    border-radius: 8px;
    font-family: var(--font-accent);
    font-weight: 700;
    font-size: 2.2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    
    /* Absolute mapping via row & col CSS custom properties */
    left: calc(var(--grid-gap) + var(--col) * (var(--tile-size) + var(--grid-gap)));
    top: calc(var(--grid-gap) + var(--row) * (var(--tile-size) + var(--grid-gap)));
    
    /* Sliding and scaling transitions handled strictly by CSS */
    transition: top var(--transition-speed) var(--transition-curve), 
                left var(--transition-speed) var(--transition-curve);
    transform-origin: center center;
}

/* Adjust font sizes dynamically based on grid size */
.game-board[data-size="3"] .tile { font-size: 2.8rem; border-radius: 10px; }
.game-board[data-size="4"] .tile { font-size: 2.2rem; border-radius: 8px; }
.game-board[data-size="5"] .tile { font-size: 1.8rem; border-radius: 6px; }
.game-board[data-size="6"] .tile { font-size: 1.4rem; border-radius: 4px; }

/* Smaller fonts for higher numbers to prevent overflow */
.tile.tile-value-128, .tile.tile-value-256, .tile.tile-value-512 { font-size: 1.8rem !important; }
.tile.tile-value-1024, .tile.tile-value-2048 { font-size: 1.4rem !important; }
.tile.tile-value-4096, .tile.tile-value-8192 { font-size: 1.2rem !important; }

/* In a 6x6 grid, shrink typography even more */
.game-board[data-size="6"] .tile.tile-value-128,
.game-board[data-size="6"] .tile.tile-value-256,
.game-board[data-size="6"] .tile.tile-value-512 { font-size: 1.2rem !important; }
.game-board[data-size="6"] .tile.tile-value-1024,
.game-board[data-size="6"] .tile.tile-value-2048 { font-size: 1.0rem !important; }

/* Tile Animations */
.tile-spawn {
    animation: tile-spawn 200ms var(--transition-curve) forwards;
}

.tile-merged {
    animation: tile-merge 250ms var(--transition-curve) forwards;
    z-index: 10; /* Merged tiles stay on top during merge pop */
}

@keyframes tile-spawn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes tile-merge {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.22);
    }
    100% {
        transform: scale(1);
    }
}

/* --- TILE COLOR PALETTE (Light Theme Defaults) --- */
.tile-2    { background-color: #EEE4DA; color: #776E65; }
.tile-4    { background-color: #EDE0C8; color: #776E65; }
.tile-8    { background-color: #F2B179; color: #F9F6F2; }
.tile-16   { background-color: #F59563; color: #F9F6F2; }
.tile-32   { background-color: #F67C5F; color: #F9F6F2; }
.tile-64   { background-color: #F65E3B; color: #F9F6F2; }
.tile-128  { background-color: #EDCF72; color: #F9F6F2; box-shadow: 0 0 10px 2px rgba(237, 207, 114, 0.3); }
.tile-256  { background-color: #EDCC61; color: #F9F6F2; box-shadow: 0 0 12px 3px rgba(237, 204, 97, 0.4); }
.tile-512  { background-color: #EDC850; color: #F9F6F2; box-shadow: 0 0 14px 4px rgba(237, 200, 80, 0.45); }
.tile-1024 { background-color: #EDC53F; color: #F9F6F2; box-shadow: 0 0 16px 5px rgba(237, 197, 63, 0.5); }
.tile-2048 { background-color: #EDC22E; color: #F9F6F2; box-shadow: 0 0 20px 6px rgba(237, 194, 46, 0.6); }

/* Beyond 2048 color palettes */
.tile-4096 { background-color: #3C3A33; color: #F9F6F2; }
.tile-8192 { background-color: #1F1E19; color: #F9F6F2; }
.tile-super { background-color: #A855F7; color: #FFFFFF; box-shadow: 0 0 25px 8px rgba(168, 85, 247, 0.7); }

/* --- DARK MODE TILE PALETTES --- */
html[data-theme="dark"] .tile-2    { background-color: #1E293B; color: #94A3B8; border: 1px solid rgba(255, 255, 255, 0.03); }
html[data-theme="dark"] .tile-4    { background-color: #334155; color: #E2E8F0; }
html[data-theme="dark"] .tile-8    { background-color: #C2410C; color: #FFF; }
html[data-theme="dark"] .tile-16   { background-color: #EA580C; color: #FFF; }
html[data-theme="dark"] .tile-32   { background-color: #E11D48; color: #FFF; }
html[data-theme="dark"] .tile-64   { background-color: #BE123C; color: #FFF; }
html[data-theme="dark"] .tile-128  { background-color: #D97706; color: #FFF; box-shadow: 0 0 12px rgba(217, 119, 6, 0.4); }
html[data-theme="dark"] .tile-256  { background-color: #F59E0B; color: #000; font-weight: 800; box-shadow: 0 0 15px rgba(245, 158, 11, 0.5); }
html[data-theme="dark"] .tile-512  { background-color: #EAB308; color: #000; font-weight: 800; box-shadow: 0 0 18px rgba(234, 179, 8, 0.6); }
html[data-theme="dark"] .tile-1024 { background-color: #84CC16; color: #000; font-weight: 800; box-shadow: 0 0 22px rgba(132, 204, 22, 0.6); }
html[data-theme="dark"] .tile-2048 { background-color: #10B981; color: #FFF; font-weight: 800; box-shadow: 0 0 25px rgba(16, 185, 129, 0.7); }

/* --- OVERLAY SCREEN LAYERS --- */
.overlay-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 16px;
    background-color: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(8px);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.overlay-container.hidden {
    opacity: 0;
    pointer-events: none;
    display: none;
}

.overlay-screen {
    width: 85%;
    text-align: center;
    color: #FFFFFF;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: overlay-bounce 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.overlay-screen.hidden {
    display: none;
}

@keyframes overlay-bounce {
    0% { transform: scale(0.85); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.overlay-title {
    font-family: var(--font-accent);
    font-size: 3rem;
    line-height: 1.1;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #FFF, #94A3B8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#game-win-screen .overlay-title {
    background: linear-gradient(135deg, #F59E0B, #EAB308, #10B981);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.overlay-text {
    font-size: 1.1rem;
    color: #E2E8F0;
    margin-bottom: 20px;
}

.overlay-final-score {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 25px;
}

.overlay-final-score span {
    font-family: var(--font-accent);
    color: #3B82F6;
    font-size: 1.8rem;
    margin-left: 5px;
}

/* Trophy Badge */
.trophy-badge {
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 15px;
    animation: pulse-glow 2s infinite alternate;
}

@keyframes pulse-glow {
    0% { transform: scale(1); filter: drop-shadow(0 0 2px rgba(245, 158, 11, 0.4)); }
    100% { transform: scale(1.1); filter: drop-shadow(0 0 15px rgba(245, 158, 11, 0.8)); }
}

/* Name Forms inside Overlays */
.name-entry-form {
    background-color: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 15px;
    width: 100%;
    max-width: 340px;
    margin-bottom: 20px;
}

.name-entry-form label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #CBD5E1;
    display: block;
    text-align: left;
    margin-bottom: 8px;
}

.form-row {
    display: flex;
    gap: 8px;
    width: 100%;
}

.form-row input {
    flex: 1;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.95rem;
    font-weight: 500;
    outline: none;
    transition: border-color 0.2s ease;
}

.overlay-screen .form-row input {
    background-color: #0F172A;
    color: #F8FAFC;
    border-color: #334155;
}

.form-row input:focus {
    border-color: var(--input-focus);
}

.overlay-btn-group {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

.mt-15 { margin-top: 15px; }
.mt-10 { margin-top: 10px; }

/* --- Game Instructions Bar --- */
.game-instructions {
    margin-top: 25px;
    background-color: var(--bg-secondary);
    border-radius: 14px;
    padding: 15px;
    max-width: var(--board-width);
    text-align: left;
    border: 1px solid var(--cell-bg);
    box-shadow: var(--card-shadow);
}

.game-instructions p {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

/* Render control highlights based on desktop/mobile */
.mobile-hint { display: none; }
.desktop-hint { display: block; }

/* --- Right Column: Sidebar Section --- */
.sidebar-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Sidebar Card Wrapper */
.sidebar-card {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--cell-bg);
    transition: transform 0.2s ease;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.2px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* 1. Active Player Input Card */
.player-card {
    border-left: 4px solid var(--btn-primary-bg);
}

/* 2. Leaderboard Card */
.leaderboard-card {
    border-left: 4px solid #F59E0B;
}

.leaderboard-header {
    display: flex;
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--bg-tertiary);
    padding: 10px 0;
    margin-top: 10px;
}

.leaderboard-header .rank { width: 35px; }
.leaderboard-header .name { flex: 1; }
.leaderboard-header .score { width: 80px; text-align: right; margin-right: 15px; }
.leaderboard-header .date { width: 80px; text-align: right; }

.leaderboard-list {
    max-height: 280px;
    overflow-y: auto;
    margin-top: 5px;
}

.leaderboard-row {
    display: flex;
    align-items: center;
    padding: 8px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.1);
    font-weight: 500;
}

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

.leaderboard-row .rank {
    width: 35px;
    font-weight: 700;
    color: var(--text-secondary);
}

/* Top 3 ranks highlighting */
.leaderboard-row:nth-child(1) .rank { color: #F59E0B; font-weight: 800; font-size: 1rem; }
.leaderboard-row:nth-child(2) .rank { color: #94A3B8; font-weight: 800; font-size: 1rem; }
.leaderboard-row:nth-child(3) .rank { color: #B45309; font-weight: 800; font-size: 1rem; }

.leaderboard-row .name {
    flex: 1;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.leaderboard-row .score {
    width: 80px;
    font-family: var(--font-accent);
    text-align: right;
    font-weight: 700;
    color: var(--text-primary);
    margin-right: 15px;
}

.leaderboard-row .date {
    width: 80px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-align: right;
}

.no-records {
    padding: 25px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

/* Custom Slim Scrollbar */
.leaderboard-list::-webkit-scrollbar {
    width: 5px;
}
.leaderboard-list::-webkit-scrollbar-track {
    background: transparent;
}
.leaderboard-list::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 10px;
}

/* 3. Statistics Card */
.stats-card {
    border-left: 4px solid #10B981;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 15px;
}

.stat-item {
    background-color: var(--bg-tertiary);
    border-radius: 10px;
    padding: 10px;
    text-align: center;
    border: 1px solid var(--cell-bg);
}

.stat-label {
    display: block;
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 4px;
}

.stat-value {
    font-family: var(--font-accent);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* --- Footer --- */
.app-footer {
    margin-top: 40px;
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid var(--cell-bg);
}

.app-footer p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   RESPONSIVE DESIGN (MOBILE MEDIA QUERIES)
   ========================================================================== */

/* Tablet & Smaller Screens */
@media screen and (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 1fr;
        justify-items: center;
        gap: 30px;
    }
    
    .sidebar-section {
        width: 100%;
        max-width: var(--board-width);
    }
}

/* Mobile Screens */
@media screen and (max-width: 550px) {
    :root {
        --board-width: 100%;
        --grid-gap: 8px;
    }
    
    .app-container {
        padding: 12px;
    }
    
    .game-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
        margin-bottom: 15px;
    }
    
    .header-right {
        width: 100%;
    }
    
    .score-container {
        width: 100%;
        justify-content: space-between;
    }
    
    .score-card {
        flex: 1;
        padding: 8px 12px;
    }
    
    .logo {
        font-size: 2.8rem;
    }
    
    .control-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 12px;
        border-radius: 12px;
        margin-bottom: 15px;
    }
    
    .control-group {
        justify-content: space-between;
        width: 100%;
    }
    
    .board-wrapper {
        width: 100vw;
        height: 100vw;
        max-width: 440px;
        max-height: 440px;
        padding: 0 12px;
    }
    
    .game-board {
        border-radius: 12px;
    }
    
    /* Make tiles adjust to padding */
    .board-wrapper {
        padding: 0;
        width: 100%;
        height: 0;
        padding-bottom: 100%; /* Perfect responsive aspect ratio square */
    }
    
    .game-board {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
    
    /* Swap hint visibility on mobile */
    .desktop-hint { display: none; }
    .mobile-hint { display: block; }
    
    .game-instructions {
        margin-top: 15px;
        padding: 12px;
        border-radius: 10px;
    }
    
    .overlay-title {
        font-size: 2.2rem;
    }
    
    .overlay-text {
        font-size: 0.95rem;
    }
    
    .trophy-badge {
        font-size: 3rem;
    }
    
    .name-entry-form {
        max-width: 280px;
        padding: 10px;
    }
    
    .sidebar-card {
        padding: 15px;
        border-radius: 12px;
    }
    
    .stats-grid {
        gap: 6px;
    }
    
    .stat-item {
        padding: 8px 5px;
    }
    
    .stat-label {
        font-size: 0.6rem;
    }
    
    .stat-value {
        font-size: 1rem;
    }
}


.agn-2048-page #mainContent {
    min-height: 100vh;
}

.agn-2048-page .app-container {
    padding-top: 104px;
}

@media (orientation: portrait) and (max-width: 900px) {
    .agn-2048-page .app-container {
        padding-top: 126px;
    }
}

@media (max-width: 760px) {
    .agn-2048-page .app-container {
        padding-left: 12px;
        padding-right: 12px;
    }
}