/* THEME DEFINITIONS */

/* 1. Neon Cyberpunk (Default) */
.theme-neon {
    --bg-color: #050505;
    --bg-gradient: radial-gradient(circle at center, #1a1a1a 0%, #050505 100%);
    --text-color: #ffffff;
    --cell-bg: #1a1a1a;
    --cell-border: #333;
    --cell-hover: #252525;
    --highlight-x: #00e5ff;
    --highlight-o: #ff007f;
    --glow-x: 0 0 15px #00e5ff, 0 0 30px #00e5ff;
    --glow-o: 0 0 15px #ff007f, 0 0 30px #ff007f;
    --btn-border: #fff;
    --btn-text: #fff;
    --btn-hover-bg: #fff;
    --btn-hover-text: #000;
    --modal-bg: rgba(20, 20, 20, 0.98);
    --sidebar-bg: rgba(15, 15, 15, 0.98);
    --btn-primary-grad: linear-gradient(90deg, #00e5ff, #0099cc);
    --reset-btn-bg: rgba(255, 255, 255, 0.1);
    --shape-1: #00e5ff;
    --shape-2: #ff007f;
    --shape-3: #7b2cbf;
}

/* 2. Sunset Vaporwave */
.theme-sunset {
    --bg-color: #2d1b4e;
    --bg-gradient: linear-gradient(135deg, #2d1b4e 0%, #1c102e 100%);
    --text-color: #ffd700;
    --cell-bg: rgba(255, 255, 255, 0.15);
    --cell-border: #5e3b8a;
    --cell-hover: rgba(255, 255, 255, 0.25);
    --highlight-x: #ff9e00; 
    --highlight-o: #d400ff; 
    --glow-x: 0 0 15px #ff9e00, 0 0 30px #ff9e00;
    --glow-o: 0 0 15px #d400ff, 0 0 30px #d400ff;
    --btn-border: #ffd700;
    --btn-text: #ffd700;
    --btn-hover-bg: #ffd700;
    --btn-hover-text: #2d1b4e;
    --modal-bg: rgba(45, 27, 78, 0.98);
    --sidebar-bg: rgba(35, 20, 60, 0.98);
    --btn-primary-grad: linear-gradient(90deg, #ff9e00, #ff5e00);
    --reset-btn-bg: rgba(255, 215, 0, 0.1);
    --shape-1: #ff9e00;
    --shape-2: #d400ff;
    --shape-3: #ffd700;
}

/* 3. Deep Ocean */
.theme-ocean {
    --bg-color: #001f3f;
    --bg-gradient: linear-gradient(to bottom, #001f3f, #001226);
    --text-color: #7FDBFF;
    --cell-bg: #003366;
    --cell-border: #004080;
    --cell-hover: #004d99;
    --highlight-x: #39CCCC; 
    --highlight-o: #ffffff; 
    --glow-x: 0 0 10px #39CCCC, 0 0 20px #39CCCC;
    --glow-o: 0 0 10px #ffffff, 0 0 20px #ffffff;
    --btn-border: #7FDBFF;
    --btn-text: #7FDBFF;
    --btn-hover-bg: #7FDBFF;
    --btn-hover-text: #001f3f;
    --modal-bg: rgba(0, 31, 63, 0.98);
    --sidebar-bg: rgba(0, 25, 50, 0.98);
    --btn-primary-grad: linear-gradient(90deg, #39CCCC, #0074D9);
    --reset-btn-bg: rgba(127, 219, 255, 0.1);
    --shape-1: #39CCCC;
    --shape-2: #7FDBFF;
    --shape-3: #0074D9;
}

/* 4. Mystic Forest */
.theme-forest {
    --bg-color: #1a2f1a;
    --bg-gradient: radial-gradient(circle, #2a4f2a 0%, #0f1f0f 100%);
    --text-color: #e0f2d8;
    --cell-bg: #2a4a2a;
    --cell-border: #3b6e3b;
    --cell-hover: #3d7a3d;
    --highlight-x: #76ff03; 
    --highlight-o: #ffcc00; 
    --glow-x: 0 0 15px #76ff03, 0 0 30px #76ff03;
    --glow-o: 0 0 15px #ffcc00, 0 0 30px #ffcc00;
    --btn-border: #e0f2d8;
    --btn-text: #e0f2d8;
    --btn-hover-bg: #e0f2d8;
    --btn-hover-text: #1a2f1a;
    --modal-bg: rgba(26, 47, 26, 0.98);
    --sidebar-bg: rgba(20, 35, 20, 0.98);
    --btn-primary-grad: linear-gradient(90deg, #76ff03, #64dd17);
    --reset-btn-bg: rgba(118, 255, 3, 0.1);
    --shape-1: #76ff03;
    --shape-2: #ffcc00;
    --shape-3: #64dd17;
}

/* 5. Cyber Light */
.theme-light {
    --bg-color: #e0e5ec;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --text-color: #333333;
    --cell-bg: #e0e5ec;
    --cell-border: #d1d9e6;
    --cell-hover: #f5f7fa;
    --highlight-x: #008cba;
    --highlight-o: #d81b60;
    --glow-x: 0 0 5px rgba(0, 140, 186, 0.3);
    --glow-o: 0 0 5px rgba(216, 27, 96, 0.3);
    --btn-border: #333;
    --btn-text: #333;
    --btn-hover-bg: #333;
    --btn-hover-text: #fff;
    --modal-bg: rgba(255, 255, 255, 0.98);
    --sidebar-bg: rgba(240, 245, 250, 0.98);
    --btn-primary-grad: linear-gradient(90deg, #008cba, #005f7f);
    --reset-btn-bg: rgba(0, 0, 0, 0.05);
    --shape-1: #008cba;
    --shape-2: #d81b60;
    --shape-3: #7b2cbf;
}

/*  GENERAL STYLES & ANIMATIONS */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: var(--bg-gradient);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    position: relative;
    transition: background 0.5s ease, color 0.3s ease;
}

/*ANIMATED BACKGROUND WITH PARALLAX */

.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s ease-in-out infinite;
    will-change: transform;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--shape-1);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 500px;
    height: 500px;
    background: var(--shape-2);
    bottom: -150px;
    right: -150px;
    animation-delay: -7s;
}

.shape-3 {
    width: 350px;
    height: 350px;
    background: var(--shape-3);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-30px, 30px) scale(0.9);
    }
}

/* Floating Particles */
.floating-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.floating-particles::before,
.floating-particles::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--text-color);
    border-radius: 50%;
    opacity: 0.3;
    animation: particle-float 15s linear infinite;
}

.floating-particles::before {
    top: 20%;
    left: 30%;
    animation-delay: -5s;
}

.floating-particles::after {
    top: 60%;
    right: 25%;
    animation-delay: -10s;
}

@keyframes particle-float {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 0.3;
    }
    90% {
        opacity: 0.3;
    }
    100% {
        transform: translateY(-100vh) translateX(50px);
        opacity: 0;
    }
}

/*TOP CONTROLS BAR*/

.top-controls {
    position: fixed;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 1000;
    padding: 10px 18px;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.icon-btn {
    width: 44px;
    height: 44px;
    background: transparent;
    border: 2px solid var(--text-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    fill: var(--text-color);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    position: relative;
}

.icon-btn svg {
    width: 22px;
    height: 22px;
    pointer-events: none;
}

.icon-btn:hover {
    background: var(--text-color);
    fill: var(--bg-color);
    transform: scale(1.15) rotate(10deg);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
}

.icon-btn:active {
    transform: scale(0.95) rotate(0deg);
}

.icon-btn.muted {
    opacity: 0.6;
    border-color: #ff4444;
}

.icon-btn.muted:hover {
    opacity: 1;
}

.icon-btn.muted svg path {
    fill: #ff4444;
}

/* MAIN CONTAINER */

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    width: 100%;
    max-width: 500px;
    z-index: 1;
    padding: 90px 20px 30px;
    animation: fadeInUp 0.6s ease-out;
    min-height: 100vh;
    justify-content: flex-start;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* TITLE ANIMATION */

.game-title {
    font-size: 2.8rem;
    font-weight: 900;
    letter-spacing: 3px;
    display: flex;
    gap: 12px;
    margin-bottom: 0;
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.title-word {
    display: inline-block;
    animation: titleBounce 1.2s ease-in-out infinite;
    color: var(--text-color);
}

.title-word.highlight {
    color: var(--highlight-x);
    text-shadow: var(--glow-x);
}

.title-word:nth-child(1) {
    animation-delay: 0s;
}

.title-word:nth-child(2) {
    animation-delay: 0.2s;
}

.title-word:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes titleBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

/* TOURNAMENT MODE CONTAINER */

.tournament-container {
    width: 100%;
    max-width: 450px;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    animation: slideDown 0.4s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tournament-title {
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 12px;
    color: var(--text-color);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.tournament-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
}

.player-wins {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.player-label {
    font-size: 0.95rem;
    font-weight: 600;
    opacity: 0.9;
}

.win-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.dot.filled {
    background: var(--highlight-x);
    border-color: var(--highlight-x);
    box-shadow: 0 0 15px var(--highlight-x);
    animation: dotPulse 0.5s ease;
}

.dot.filled.player-o {
    background: var(--highlight-o);
    border-color: var(--highlight-o);
    box-shadow: 0 0 15px var(--highlight-o);
}

@keyframes dotPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.3);
    }
}

.vs-divider {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-color);
    opacity: 0.8;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

/* SETTINGS BAR */

.settings-bar {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 450px;
}

.settings-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.mode-btn {
    padding: 10px 18px;
    background: transparent;
    border: 2px solid var(--btn-border);
    border-radius: 25px;
    color: var(--btn-text);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.mode-btn:hover {
    background: var(--btn-hover-bg);
    color: var(--btn-hover-text);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

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

.mode-btn.active {
    background: var(--btn-primary-grad);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.btn-icon {
    font-size: 1.2rem;
}

/* AI Difficulty */
.difficulty-container {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    padding: 8px 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    font-size: 0.9rem;
}

.difficulty-select {
    padding: 6px 12px;
    background: var(--cell-bg);
    color: var(--text-color);
    border: 2px solid var(--cell-border);
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.difficulty-select:hover {
    border-color: var(--highlight-x);
}

.difficulty-select:focus {
    outline: none;
    border-color: var(--highlight-x);
    box-shadow: 0 0 15px var(--highlight-x);
}

/* Name Inputs */
.name-inputs {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.name-field {
    width: 110px;
    padding: 8px 12px;
    background: var(--cell-bg);
    color: var(--text-color);
    border: 2px solid var(--cell-border);
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.name-field:focus {
    outline: none;
    border-color: var(--highlight-x);
    box-shadow: 0 0 15px var(--highlight-x);
}

.name-field.x-style:focus {
    border-color: var(--highlight-x);
    box-shadow: 0 0 15px var(--highlight-x);
}

.name-field.o-style:focus {
    border-color: var(--highlight-o);
    box-shadow: 0 0 15px var(--highlight-o);
}

.vs {
    font-weight: bold;
    font-size: 1.1rem;
    opacity: 0.7;
}

/* SCOREBOARD */

.scoreboard {
    display: flex;
    gap: 12px;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 450px;
}

.score-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    min-width: 85px;
}

.score-box:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.3);
}

.score-label {
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.score-value {
    font-size: 1.8rem;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.x-score .score-value {
    color: var(--highlight-x);
    text-shadow: var(--glow-x);
}

.o-score .score-value {
    color: var(--highlight-o);
    text-shadow: var(--glow-o);
}

.draw-score .score-value {
    color: var(--text-color);
}

/* STATUS & TIMER */

.status-container {
    width: 100%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.status {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.timer-bar {
    width: 100%;
    height: 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    overflow: hidden;
}

.timer-fill {
    height: 100%;
    background: var(--btn-primary-grad);
    transition: width 0.1s linear;
    box-shadow: 0 0 15px var(--highlight-x);
}

/* GAME BOARD */

.game-wrapper {
    position: relative;
    width: 100%;
    max-width: 390px;
    aspect-ratio: 1;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: 100%;
    height: 100%;
    padding: 0;
}

.cell {
    aspect-ratio: 1;
    width: 100%;
    background: var(--cell-bg);
    border: 3px solid var(--cell-border);
    border-radius: 18px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    user-select: none;
    position: relative;
}

.cell:hover:not(.cell-x):not(.cell-o) {
    background: var(--cell-hover);
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.cell:active:not(.cell-x):not(.cell-o) {
    transform: scale(0.98);
}

.cell-x {
    color: var(--highlight-x);
    text-shadow: var(--glow-x);
    animation: cellPop 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.cell-o {
    color: var(--highlight-o);
    text-shadow: var(--glow-o);
    animation: cellPop 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes cellPop {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* WINNING LINE */
.winning-line {
    position: absolute;
    height: 8px;
    background: var(--highlight-x);
    border-radius: 10px;
    box-shadow: 0 0 25px var(--highlight-x), 0 0 50px var(--highlight-x);
    transform-origin: left center;
    pointer-events: none;
    z-index: 10;
    top: 0;
    left: 0;
}

.winning-line.o-win {
    background: var(--highlight-o);
    box-shadow: 0 0 25px var(--highlight-o), 0 0 50px var(--highlight-o);
}

/*CONTROL BUTTONS*/

.control-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    width: 100%;
    max-width: 450px;
    flex-wrap: wrap;
}

.control-btn {
    padding: 10px 20px;
    background: var(--reset-btn-bg);
    border: 2px solid var(--btn-border);
    border-radius: 25px;
    color: var(--btn-text);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(10px);
}

.control-btn:hover {
    background: var(--btn-hover-bg);
    color: var(--btn-hover-text);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

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

.control-btn svg {
    width: 18px;
    height: 18px;
}

/* MODALS - WIN/DRAW/SKINS/ACHIEVEMENTS */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.show {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--modal-bg);
    padding: 40px 35px;
    border-radius: 25px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    text-align: center;
    animation: modalSlideIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    min-width: 350px;
    max-width: 90%;
}

@keyframes modalSlideIn {
    from {
        transform: scale(0.7) translateY(-50px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: iconSpin 0.6s ease;
}

@keyframes iconSpin {
    from {
        transform: rotate(-180deg) scale(0);
    }
    to {
        transform: rotate(0) scale(1);
    }
}

#modal-title {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 15px;
    color: var(--text-color);
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

#modal-message {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.modal-btn {
    padding: 14px 30px;
    border: none;
    border-radius: 25px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 140px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.modal-btn.continue {
    background: var(--btn-primary-grad);
    color: #fff;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.modal-btn.continue:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.modal-btn.exit {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.modal-btn.exit:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.btn-shortcut {
    opacity: 0.6;
    font-size: 0.85rem;
    padding: 2px 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

/* Achievement Popup in Modal */
.achievement-popup {
    margin: 15px 0;
    padding: 15px;
    background: rgba(255, 215, 0, 0.15);
    border-radius: 15px;
    border: 2px solid #FFD700;
    animation: achievementPulse 1s ease infinite;
}

@keyframes achievementPulse {
    0%, 100% {
        box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
    }
    50% {
        box-shadow: 0 0 30px rgba(255, 215, 0, 0.6);
    }
}

/* SKINS MODAL*/

.skins-modal-content {
    min-width: 400px;
}

.skins-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin: 25px 0;
}

.skin-option {
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-radius: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.skin-option:hover {
    transform: translateY(-5px);
    border-color: var(--highlight-x);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.skin-option.active {
    border-color: var(--highlight-x);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 25px var(--highlight-x);
}

.skin-preview {
    display: flex;
    gap: 15px;
    font-size: 2.5rem;
}

.skin-name {
    font-size: 0.9rem;
    font-weight: 600;
    opacity: 0.8;
}

/* ACHIEVEMENTS MODAL*/

.achievements-modal-content {
    min-width: 450px;
    max-height: 85vh;
    overflow-y: auto;
}

.achievements-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 25px 0;
    max-height: 60vh;
    overflow-y: auto;
    padding-right: 10px;
}

.achievement-item {
    padding: 18px 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
}

.achievement-item:hover {
    transform: translateX(5px);
    background: rgba(255, 255, 255, 0.08);
}

.achievement-item.unlocked {
    border-color: #FFD700;
    background: rgba(255, 215, 0, 0.1);
}

.achievement-icon {
    font-size: 2.5rem;
    opacity: 0.5;
}

.achievement-item.unlocked .achievement-icon {
    opacity: 1;
    animation: achievementUnlock 0.6s ease;
}

@keyframes achievementUnlock {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.3) rotate(15deg);
    }
}

.achievement-info {
    flex: 1;
    text-align: left;
}

.achievement-title {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 5px;
}

.achievement-desc {
    font-size: 0.85rem;
    opacity: 0.7;
}

.achievement-item.locked .achievement-icon {
    filter: grayscale(100%);
}

/* ACHIEVEMENT TOAST NOTIFICATION */

.achievement-toast {
    position: fixed;
    top: 80px;
    right: 20px;
    min-width: 320px;
    padding: 15px 25px;
    background: var(--modal-bg);
    border-radius: 18px;
    border: 3px solid #FFD700;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(255, 215, 0, 0.4);
    display: none;
    align-items: center;
    gap: 15px;
    z-index: 3000;
    animation: toastSlideIn 0.5s ease;
}

.achievement-toast.show {
    display: flex;
}

@keyframes toastSlideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-icon {
    font-size: 2.5rem;
    animation: toastIconBounce 0.6s ease infinite;
}

@keyframes toastIconBounce {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 700;
    font-size: 1.1rem;
    color: #FFD700;
    margin-bottom: 5px;
}

.toast-message {
    font-size: 0.9rem;
    opacity: 0.9;
}

/*HISTORY SIDEBAR*/

.history-sidebar {
    position: fixed;
    top: 0;
    right: -400px;
    width: 350px;
    height: 100vh;
    background: var(--sidebar-bg);
    backdrop-filter: blur(15px);
    border-left: 3px solid rgba(255, 255, 255, 0.2);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
    padding: 25px;
    z-index: 2500;
    transition: right 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    overflow-y: auto;
}

.history-sidebar.open {
    right: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
}

.close-btn {
    background: transparent;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    font-size: 1.3rem;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: var(--text-color);
    color: var(--bg-color);
    transform: rotate(90deg);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border-left: 4px solid var(--highlight-x);
    transition: all 0.3s ease;
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.history-item.player-o {
    border-left-color: var(--highlight-o);
}

.empty-history {
    text-align: center;
    opacity: 0.6;
    padding: 40px 20px;
    font-style: italic;
}

/*PARTICLE EFFECTS*/

.particle {
    position: absolute;
    width: 10px;
    height: 10px;
    pointer-events: none;
    animation: particleFall 1.5s forwards;
    z-index: 200;
    border-radius: 50%;
}

@keyframes particleFall {
    to {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.confetti {
    position: absolute;
    width: 8px;
    height: 12px;
    pointer-events: none;
    z-index: 201;
    animation: confettiFall 3s forwards;
}

@keyframes confettiFall {
    to {
        transform: translateY(100vh) rotate(1080deg);
        opacity: 0;
    }
}

/* RESPONSIVE DESIGN */

/* Tablets and Small Laptops */
@media (max-width: 768px) {
    .container {
        padding: 85px 15px 25px;
        gap: 16px;
    }

    .game-title {
        font-size: 2.4rem;
    }

    .cell {
        font-size: 3rem;
    }

    .tournament-container,
    .settings-bar,
    .scoreboard,
    .status-container,
    .control-buttons {
        max-width: 420px;
    }
}

/* Mobile Devices */
@media (max-width: 600px) {
    body {
        overflow-y: auto;
    }

    .top-controls {
        gap: 6px;
        padding: 6px 10px;
        scale: 0.9;
        top: 10px;
    }

    .icon-btn {
        width: 38px;
        height: 38px;
    }

    .icon-btn svg {
        width: 20px;
        height: 20px;
    }

    .container {
        padding: 75px 12px 25px;
        gap: 14px;
        min-height: auto;
    }

    .game-title {
        font-size: 2rem;
        gap: 8px;
    }

    .tournament-container {
        padding: 12px 15px;
    }

    .tournament-title {
        font-size: 1rem;
        margin-bottom: 10px;
    }

    .player-label {
        font-size: 0.85rem;
    }

    .dot {
        width: 16px;
        height: 16px;
    }

    .game-wrapper {
        max-width: 350px;
    }

    .game-board {
        gap: 10px;
    }

    .cell {
        font-size: 2.6rem;
        border-radius: 15px;
        border-width: 2px;
    }

    .scoreboard {
        gap: 10px;
    }

    .score-box {
        padding: 10px 16px;
        min-width: 75px;
    }

    .score-label {
        font-size: 0.75rem;
    }

    .score-value {
        font-size: 1.6rem;
    }

    .settings-row {
        gap: 8px;
    }

    .mode-btn {
        padding: 8px 14px;
        font-size: 0.85rem;
        flex: 1;
        min-width: 0;
    }

    .btn-icon {
        font-size: 1rem;
    }

    .name-field {
        width: 90px;
        font-size: 0.95rem;
    }

    .control-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .control-btn {
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
    }

    .history-sidebar {
        width: 300px;
        right: -320px;
        padding: 20px;
    }

    .modal-content {
        padding: 30px 25px;
        min-width: 300px;
        max-width: 95%;
    }

    .modal-icon {
        font-size: 3.5rem;
        margin-bottom: 15px;
    }

    #modal-title {
        font-size: 1.8rem;
        margin-bottom: 12px;
    }

    #modal-message {
        font-size: 1.05rem;
        margin-bottom: 25px;
    }

    .modal-btn {
        padding: 12px 24px;
        font-size: 0.95rem;
        min-width: 120px;
    }

    .skins-modal-content {
        min-width: 300px;
    }

    .skins-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .skin-preview {
        font-size: 2rem;
        gap: 12px;
    }

    .skin-name {
        font-size: 0.85rem;
    }

    .achievements-modal-content {
        min-width: 300px;
    }

    .achievement-toast {
        min-width: 280px;
        padding: 12px 20px;
        top: 70px;
        right: 10px;
    }

    .toast-icon {
        font-size: 2rem;
    }

    .toast-title {
        font-size: 1rem;
    }

    .toast-message {
        font-size: 0.85rem;
    }

    .difficulty-container {
        font-size: 0.85rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .difficulty-select {
        font-size: 0.85rem;
        padding: 5px 10px;
    }
}

/* Small Mobile Devices */
@media (max-width: 400px) {
    .container {
        padding: 70px 10px 20px;
    }

    .game-wrapper {
        max-width: 310px;
    }

    .game-board {
        gap: 8px;
    }

    .cell {
        font-size: 2.2rem;
        border-radius: 12px;
    }

    .game-title {
        font-size: 1.7rem;
        gap: 6px;
    }

    .top-controls {
        scale: 0.8;
    }

    .scoreboard {
        scale: 0.95;
    }

    .modal-content {
        padding: 25px 20px;
    }

    #modal-title {
        font-size: 1.6rem;
    }

    .achievement-toast {
        min-width: 260px;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
    }
}

/* Extra Small Devices */
@media (max-width: 350px) {
    .game-wrapper {
        max-width: 280px;
    }

    .cell {
        font-size: 2rem;
    }

    .game-title {
        font-size: 1.5rem;
    }

    .top-controls {
        gap: 4px;
        padding: 5px 8px;
    }

    .icon-btn {
        width: 32px;
        height: 32px;
    }

    .icon-btn svg {
        width: 18px;
        height: 18px;
    }
}

/*LANDSCAPE MODE OPTIMIZATIONS*/

@media (max-height: 700px) and (orientation: landscape) {
    .container {
        padding: 70px 15px 20px;
        gap: 10px;
    }

    .game-title {
        font-size: 1.8rem;
        margin-bottom: 0;
    }

    .tournament-container {
        padding: 10px 15px;
    }

    .game-wrapper {
        max-width: 300px;
    }

    .cell {
        font-size: 2.2rem;
    }

    .scoreboard {
        gap: 8px;
    }

    .score-box {
        padding: 8px 15px;
    }

    .modal-content {
        max-height: 85vh;
        overflow-y: auto;
        padding: 25px;
    }

    .top-controls {
        top: 8px;
        scale: 0.85;
    }
}

@media (max-height: 550px) and (orientation: landscape) {
    .container {
        padding: 60px 10px 15px;
        gap: 8px;
    }

    .game-title {
        font-size: 1.4rem;
    }

    .game-wrapper {
        max-width: 250px;
    }

    .cell {
        font-size: 1.8rem;
        border-radius: 10px;
    }

    .game-board {
        gap: 6px;
    }

    .tournament-container,
    .scoreboard,
    .status-container {
        scale: 0.9;
    }
}

/* ACCESSIBILITY */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
button:focus-visible,
.cell:focus-visible {
    outline: 3px solid var(--highlight-x);
    outline-offset: 3px;
}

/*PRINT STYLES */

@media print {
    .top-controls,
    .control-buttons,
    .history-sidebar,
    .modal-overlay,
    .bg-animation {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .container {
        max-width: 100%;
    }
}