/* ==========================================================================
   Unified Game Styles - Complete Standalone Styles
   This file contains all styles needed for all partition games.
   ========================================================================== */

/* ==========================================================================
   1. CSS Custom Properties & Theme Variables
   ========================================================================== */

:root {
    --orange: #FF6B35;
    --orange-light: #FF8757;
    --orange-dark: #E55A2B;
    --white: #FFFFFF;
    --off-white: #FAFAFA;
    --gray-light: #F5F5F5;
    --gray: #666666;
    --gray-dark: #333333;
    --black: #000000;
    
    /* Game-specific variables */
    --removing-color: #f56565;
    --winning-color: #48bb78;
    --selected-color: #ffa600;
    --selectable-opacity: 0.8;
    --anticorner-bg: #ff6b6b;
    --anticorner-border: #e03131;
}

/* Dark mode color scheme */
[data-theme="dark"] {
    --orange: #FF7A47;
    --orange-light: #FF9166;
    --orange-dark: #FF5722;
    --white: #1a1a1a;
    --off-white: #222222;
    --gray-light: #2a2a2a;
    --gray: #a0a0a0;
    --gray-dark: #e5e5e5;
    --black: #ffffff;
}

/* ==========================================================================
   2. Global Reset & Base Styles
   ========================================================================== */

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

body {
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    background-color: var(--white);
    color: var(--gray-dark);
    line-height: 1.6;
    font-size: 14px;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 0;
}

/* Smooth transitions for theme switching */
body, 
.container,
header,
#game-card,
footer {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ==========================================================================
   3. Header Styles
   ========================================================================== */

header {
    padding: 0px 30px;
    background-color: var(--white);
}

.header-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 20px;
    position: relative;
}

.header-left {
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.header-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 30px;
    gap: 8px;
}

.header-right {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo {
    font-size: 18px;
    font-weight: 500;
    color: var(--orange);
    text-decoration: none;
}

.logo::before {
    content: "~/";
    color: var(--gray);
}

.game-title {
    font-size: 18px;
    font-weight: 500;
    color: var(--gray-dark);
}

/* Header Game Title Section */
.header-center .game-title-section {
    text-align: center;
    margin-bottom: 0;
}

.header-center .game-title-section h1 {
    font-size: 36px;
    font-weight: 700; 
    letter-spacing: -0.02em;
    color: var(--orange);
    margin: 0;
}

.header-center .game-title-section ::before {
    content: "< ";
    font-weight: 500;
    color: var(--gray-dark);
}

.header-center .game-title-section ::after {
    content: " >";
    font-weight: 500;
    color: var(--gray-dark);
}

/* Header Status Container */
.header-center .status-container { 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    gap: 8px; 
    margin-bottom: 0; 
}

.header-center #status-label { 
    min-height: auto; 
    margin: 0; 
    font-size: 16px; 
    font-weight: 500; 
    color: var(--gray); 
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.header-center #status-label.exiting { 
    opacity: 0; 
    transform: translateY(-5px); 
}

/* Status label for CRIS */
.status-container p {
    color: var(--gray);
    font-size: 14px;
    font-weight: 400;
    margin: 0;
}

nav {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: nowrap;
}

nav a {
    color: var(--gray-dark);
    text-decoration: none;
    font-weight: 400;
    font-size: 14px;
    transition: color 0.2s ease;
}

nav a:hover {
    color: var(--orange);
}

.nav-button {
    background: none;
    border: none;
    color: var(--gray-dark);
    text-decoration: none;
    font-weight: 400;
    font-family: inherit;
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s ease;
    padding: 0;
    margin: 0;
    line-height: 1;
}

.nav-button:hover {
    color: var(--orange);
}

/* Theme toggle button */
.theme-toggle {
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    font-weight: 500;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.theme-icon {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    transition: stroke 0.3s ease;
}

/* Alternative theme switcher for games that use the switch style */
.theme-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-switcher .theme-icon {
    font-size: 16px;
    cursor: pointer;
}

.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--gray);
    transition: 0.3s;
    border-radius: 20px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background-color: var(--white);
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--orange);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

.slider.round {
    border-radius: 20px;
}

.slider.round:before {
    border-radius: 50%;
}

/* ==========================================================================
   4. Main Content & Layout
   ========================================================================== */

main {
    padding: 20px 20px;
}

/* ==========================================================================
   5. Footer Styles
   ========================================================================== */

footer {
    border-top: 1px solid var(--gray-light);
    padding: 30px 0;
    background-color: var(--off-white);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--gray);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--gray);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--orange);
}

/* ==========================================================================
   6. Game-Specific Tile Themes
   ========================================================================== */

/* Terminal Tile Themes - These variables define the colors for the game tiles. */
[data-tile-theme="grass"] {
    --tile-bg: var(--off-white);
    --tile-border: var(--orange);
    --tile-shadow: var(--orange-dark);
    --anticorner-bg: #ff6b6b;
    --anticorner-border: #e03131;
}
[data-tile-theme="stone"] {
    --tile-bg: var(--off-white);
    --tile-border: var(--gray);
    --tile-shadow: var(--gray-dark);
    --anticorner-bg: #ff6b6b;
    --anticorner-border: #e03131;
}
[data-tile-theme="ice"] {
    --tile-bg: var(--off-white);
    --tile-border: #7dd3fc;
    --tile-shadow: #0ea5e9;
    --anticorner-bg: #ff6b6b;
    --anticorner-border: #e03131;
}

/* ==========================================================================
   7. Keyframe Animations
   ========================================================================== */

@keyframes thinking-dot {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1.0); }
}

@keyframes modal-entry { 
    from { opacity: 0; transform: scale(0.95) translateY(-10px); } 
    to { opacity: 1; transform: scale(1) translateY(0); } 
}

@keyframes anticorner-glow {
    from {
        box-shadow: 0 0 8px rgba(255, 107, 107, 0.6);
    }
    to {
        box-shadow: 0 0 12px rgba(255, 107, 107, 0.9);
    }
}

/* ==========================================================================
   8. Layout & Game-Specific Containers
   ========================================================================== */

#game-card { 
    position: relative; 
    width: fit-content;
    min-width: 480px; 
    margin: 40px auto; /* Center the game card with some margin */
    padding: 25px; 
    box-sizing: border-box; 
    background-color: var(--white); 
    text-align: center; 
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#board-area {
    margin: 0 auto;
}

/* ==========================================================================
   9. Header Controls Styling
   ========================================================================== */

/* Group for label and select dropdown in the nav */
.nav-control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-label {
    color: var(--gray);
    font-size: 14px;
}

.nav-select {
    background-color: var(--white);
    border: 1px solid var(--gray-light);
    color: var(--gray-dark);
    font-family: inherit;
    font-size: 14px;
    padding: 4px 8px;
    transition: all 0.2s ease;
}

[data-theme="dark"] .nav-select {
    background-color: var(--off-white);
    border-color: var(--gray-dark);
}

.nav-select:hover {
    border-color: var(--orange);
}

.nav-select:focus {
    outline: none;
    border-color: var(--orange);
    box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.2);
}

/* ==========================================================================
   10. Game Components (Board, Tiles, Modals)
   ========================================================================== */

/* Game Area, Tiles, AI Indicator */
#board-area { 
    position: relative; 
    min-height: 480px; 
    min-width: 480px; 
    margin: 0 auto;
    overflow: hidden;     /* optional: keeps huge coords from enlarging page */
    will-change: transform;   /* hint for the compositor */
}

#board-area.clickable { cursor: pointer; }

/* Tiles (used by all games) */
.tile { 
    position: absolute; 
    z-index: 2; 
    box-sizing: border-box; 
    background: var(--tile-bg); 
    border: 2px solid var(--tile-border); 
    border-right-color: var(--tile-shadow); 
    border-bottom-color: var(--tile-shadow); 
    image-rendering: pixelated; 
    pointer-events: none; 
    
    /* NEW — trimmed transition list: */
    transition: background-color 0.3s ease,
                border-color     0.3s ease,
                transform        0.3s ease;
    /* no "all", no "top", no "left" */
    
    contain: layout paint style; /* optimization hint */
}

.tile,
.label-cell{
    position: absolute;
}

.tile.highlighted { 
    transform: scale(1.05); 
    box-shadow: inset 0 0 0 3px var(--orange); 
}

.tile.removing { 
    opacity: 0; 
    transform: scale(0.2) rotate(45deg); 
    transition-duration: 0.4s; 
}

.tile.selected {
    box-shadow: inset 0 0 0 4px var(--selected-color);
    z-index: 10;
}

.tile.selectable {
    pointer-events: auto;
    cursor: pointer;
    opacity: var(--selectable-opacity);
}

.tile.selectable:hover {
    transform: scale(1.05);
}

.tile.empty {
    background: transparent;
    border: none;
    pointer-events: none;
}

/* Starting Corner Styling (for SCC game) */
.tile.starting-corner {
    border: 3px solid var(--orange);
    background-color: var(--orange-light);
    box-shadow: 0 0 10px rgba(255, 107, 53, 0.5);
}

.tile.starting-corner:hover {
    border-color: var(--orange-dark);
    background-color: var(--orange);
}

/* Starting corner when selected - ensure selection border is visible */
.tile.starting-corner.selected {
    border: 3px solid var(--orange);
    background-color: var(--orange-light);
    box-shadow: 0 0 10px rgba(255, 107, 53, 0.5), inset 0 0 0 4px var(--selected-color);
    z-index: 10;
}

/* Anticorner specific tiles */
.tile.anticorner {
    background: var(--anticorner-bg) !important;
    border-color: var(--anticorner-border) !important;
    border-right-color: var(--anticorner-border) !important;
    border-bottom-color: var(--anticorner-border) !important;
    pointer-events: auto;
    cursor: pointer;
    box-shadow: 0 0 8px rgba(255, 106, 0, 0.885);
    animation: anticorner-glow 2s ease-in-out infinite alternate;
}

.tile.anticorner:hover {
    transform: scale(1.05);
    box-shadow: 0 0 12px rgba(255, 128, 9, 0.88), inset 0 0 0 3px var(--orange);
}

/* Tile that will be removed (preview) */
.tile.will-remove {
    background: rgba(255, 107, 107, 0.3) !important;
    border-color: rgba(224, 49, 49, 0.5) !important;
    border-right-color: rgba(224, 49, 49, 0.5) !important;
    border-bottom-color: rgba(224, 49, 49, 0.5) !important;
    opacity: 0.7;
}

/* Label cells for CRIM, CRPM, CRIS, Sato-Welter games */
.label-cell {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-light);
    color: var(--gray-dark);
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    font-size: 11px;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease, transform 0.15s ease, color 0.2s ease;
}

.label-cell:hover {
    background: var(--orange);
    color: var(--white);
    transform: translateY(-2px);
}

.label-cell.row-win {
    background: #ff6b6b !important;
    color: var(--white);
}

.label-cell.col-win {
    background: #ffe600fc !important;
    color: var(--white);
}

.label-cell.highlighted {
    background: var(--orange) !important;
    color: var(--white);
}

[data-theme="dark"] .label-cell.highlighted {
    background: var(--orange-dark) !important;
}

.label-cell.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.label-cell.disabled:hover {
    background: var(--gray-light);
    color: var(--gray-dark);
    transform: none;
}

#ai-thinking-indicator { display: none; }
#ai-thinking-indicator.thinking { display: inline-flex; }
#ai-thinking-indicator .dot { 
    width: 6px; 
    height: 6px; 
    background-color: var(--gray); 
    border-radius: 50%; 
    margin: 0 2px; 
    animation: thinking-dot 1.4s infinite ease-in-out both; 
}
#ai-thinking-indicator .dot:nth-child(1) { animation-delay: -0.32s; }
#ai-thinking-indicator .dot:nth-child(2) { animation-delay: -0.16s; }

/* ==========================================================================
   11. Selection Controls (Corner, Continuous Corner games)
   ========================================================================== */

.selection-controls {
    display: flex;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: column;
    gap: 8px;
    z-index: 1100;
}

.confirm-btn {
    content: 'confirm';
    background-color: var(--orange);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 200px;
    flex-shrink: 0;
}

.confirm-btn:hover:not(:disabled) {
    background-color: var(--orange-dark);
}

.confirm-btn:disabled {
    background-color: var(--gray);
    color: var(--gray-light);
    cursor: not-allowed;
}

.clear-btn {
    background-color: var(--gray-light);
    color: var(--gray-dark);
    border: 1px solid var(--gray);
    padding: 8px 16px;
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 200px;
    flex-shrink: 0;
}

.clear-btn:hover {
    background-color: var(--gray);
    color: var(--white);
}

/* ==========================================================================
   12. Modals, Popovers, and Buttons
   ========================================================================== */

.modal-backdrop { 
    position: fixed; 
    top: 0; 
    left: 0; 
    z-index: 1000; 
    display: flex; 
    align-items: flex-start; 
    justify-content: center; 
    width: 100%; 
    height: 100%; 
    background-color: rgba(0, 0, 0, 0.6); 
    backdrop-filter: blur(4px); 
    opacity: 0; 
    visibility: hidden; 
    transition: opacity 0.3s ease; 
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 40px 0;
}

.modal-backdrop.visible { opacity: 1; visibility: visible; }

.modal { 
    display: flex; 
    flex-direction: column; 
    width: 90%; 
    max-width: 400px; 
    padding: 24px 28px; 
    gap: 16px; 
    background: var(--white); 
    border: 1px solid var(--gray-light); 
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1); 
    opacity: 0;
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    text-transform: lowercase;
    margin: auto;
    flex-shrink: 0;
}

.modal-backdrop.visible .modal { 
    animation: modal-entry 0.4s cubic-bezier(0.25, 1, 0.5, 1) forwards; 
}

.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: -10px; }
.modal-header h2 { margin: 0; font-size: 18px; }
.modal hr { width: 100%; border: none; border-top: 1px solid var(--gray-light); margin: 0; }
.modal h2, #help-popover h3 { margin: 0 0 10px 0; font-weight: 600; color: var(--gray-dark); }
.modal p, #help-popover p, #help-popover li { font-size: 13px; line-height: 1.6; color: var(--gray); }
.modal p { margin: 0; text-align: left; }
.modal label { font-weight: 500; font-size: 13px; color: var(--gray); text-align: left; }

.modal input, .modal select { 
    width: 100%; 
    padding: 8px 12px; 
    box-sizing: border-box; 
    font-size: 14px; 
    font-family: inherit;
    color: var(--gray-dark); 
    background: var(--off-white); 
    border: 1px solid var(--gray-light); 
    transition: all 0.2s ease; 
}

.modal input:focus, .modal select:focus { 
    outline: none; 
    border-color: var(--orange); 
    background-color: var(--white);
}

.modal-btn { 
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    text-transform: lowercase;
    width: 100%; 
    margin-top: 8px; 
    color: var(--white); 
    background-color: var(--orange);
    border: none;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.modal-btn:hover { background-color: var(--orange-dark); }

.secondary-button {
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    text-transform: lowercase;
    width: 100%;
    margin-bottom: 8px;
    color: var(--gray-dark);
    background-color: var(--gray-light);
    border: 1px solid var(--gray);
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.secondary-button:hover { 
    background-color: var(--gray); 
    color: var(--white);
}

.input-group { display: flex; gap: 8px; font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace; text-transform: lowercase; }
.input-group input { flex-basis: 80px; flex-shrink: 0; flex-grow: 0; min-width: 60px; font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace; }
.input-group button { flex-grow: 1; font-size: 14px; font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace; }
.input-group select { flex-shrink: 0; width: auto; font-size: 14px; font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace; }

.slider-container { width: 100%; display: flex; align-items: center; }
.difficulty-range { width: 100%; }

#difficulty-label {
    font-size: 13px;
    color: var(--gray);
    margin-right: 8px;
}

.icon-button {
    font-size: 14px;
    display: flex; 
    align-items: center; 
    justify-content: center; 
    padding: 4px; 
    background: transparent; 
    border: none; 
    border-radius: 99px; 
    color: var(--gray);
    cursor: pointer;
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
    text-transform: lowercase;
    transition: color 0.2s ease;
}

.icon-button:hover { 
    color: var(--orange); 
    background-color: var(--gray-light); 
}

.icon-button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.icon-button:disabled:hover {
    color: var(--gray);
    background-color: transparent;
}

#help-popover { 
    position: fixed; 
    top: 65px; 
    right: 20px; 
    z-index: 1001; 
    width: 280px; 
    padding: 16px 20px; 
    background: var(--white); 
    border: 1px solid var(--gray-light); 
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.1); 
    opacity: 0; 
    visibility: hidden; 
    pointer-events: none; 
    transform: translateY(-10px) scale(0.95); 
    transition: all 0.2s ease-out; 
}

#help-popover.visible { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
#help-popover p { margin: 0 0 10px 0; }
#help-popover ul { margin: 0 0 10px 0; padding-left: 20px; }
#help-popover li { margin-bottom: 5px; }



.fixed-new-game-btn {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 1100;
    background-color: var(--orange);
    color: var(--white);
    text-decoration: none;
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 500;
    transition: background-color 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-family: 'JetBrains Mono', 'Source Code Pro', 'Monaco', 'Menlo', monospace;
}

.fixed-new-game-btn:hover {
    background-color: var(--orange-dark);
}

/* ==========================================================================
   13. Authentication & Multiplayer Modal Styles (LCTR)
   ========================================================================== */

.hidden {
    display: none !important;
}

#auth-message {
    font-size: 13px;
    padding: 8px;
    border-radius: 4px;
    margin: 10px 0;
}

#auth-message.error {
    background-color: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

#auth-message.success {
    background-color: #e8f5e8;
    color: #2e7d32;
    border: 1px solid #c8e6c9;
}

/* Stack auth inputs vertically in multiplayer login/register */
#auth-section .input-group {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
}

#auth-section .input-group input {
    flex: 0 1 auto;
    min-width: 0;
    width: 100%;
}

[data-theme="dark"] #auth-message.error {
    background-color: #3d2a2a;
    color: #ff6b6b;
    border: 1px solid #5d4037;
}

[data-theme="dark"] #auth-message.success {
    background-color: #2a3d2a;
    color: #4caf50;
    border: 1px solid #388e3c;
}

#connection-status {
    font-size: 13px;
    border-radius: 4px;
}

#connection-status.connected {
    background-color: #e8f5e8;
    color: #2e7d32;
    border: 1px solid #c8e6c9;
}

#connection-status.disconnected {
    background-color: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

#connection-status.waiting {
    background-color: #fff8e1;
    color: #f57c00;
    border: 1px solid #ffecb3;
}

[data-theme="dark"] #connection-status.connected {
    background-color: #2a3d2a;
    color: #4caf50;
    border: 1px solid #388e3c;
}

[data-theme="dark"] #connection-status.disconnected {
    background-color: #3d2a2a;
    color: #ff6b6b;
    border: 1px solid #5d4037;
}

[data-theme="dark"] #connection-status.waiting {
    background-color: #3d3d2a;
    color: #ffc107;
    border: 1px solid #ff8f00;
}

#user-profile-section {
    background-color: var(--gray-light);
    border-color: var(--gray) !important;
}

[data-theme="dark"] #user-profile-section {
    background-color: var(--gray-light);
    border-color: var(--gray) !important;
}

/* ==========================================================================
   14. Responsive Design
   ========================================================================== */

@media (max-width: 768px) {
    .header-content {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .header-left {
        order: 1;
        justify-content: flex-start;
    }
    
    .header-center {
        order: 2;
    }
    
    .header-right {
        order: 3;
        justify-content: flex-end;
    }
    
    .header-center .game-title-section h1 {
        font-size: 28px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    #game-card {
        min-width: 320px;
        margin: 20px auto;
        padding: 20px;
    }
    
    #board-area {
        min-width: 320px;
        min-height: 320px;
    }
    
    .fixed-new-game-btn {
        bottom: 20px;
        right: 20px;
        padding: 10px 16px;
        font-size: 12px;
    }
    
    .modal {
        padding: 20px;
        width: 95%;
    }
    
    .modal-header h2 {
        font-size: 20px;
    }
    
    #help-popover {
        width: 95%;
        padding: 15px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 0 15px;
    }
    
    .logo {
        font-size: 16px;
    }
    
    .game-title {
        font-size: 16px;
    }
    
    .header-center .game-title-section h1 {
        font-size: 28px;
    }
    
    nav {
        gap: 8px;
    }
    
    .nav-button {
        font-size: 11px;
        padding: 5px 8px;
    }
    
    .modal {
        padding: 15px;
    }
    
    .input-group {
        flex-direction: column;
        gap: 5px;
    }
    
    .input-group button {
        padding: 8px 12px;
    }
}