@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --background-dark: #1a2a3a;
    --card-background: #2c3e50;
    --text-light: #ffffff;
    --text-dark: #1a2a3a;
    --input-background: #f8f9fa;
    --input-border: #667eea;
    --input-focus-border: #764ba2;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --color-x: #e74c3c;
    --color-o: #3498db;
    --font-primary: 'Poppins', sans-serif;
    --font-glitch: 'Courier New', Courier, monospace;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--background-dark);
    color: var(--text-light);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
    padding: 1em;
}

#brightness-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: #000;
    opacity: 0;
    pointer-events: none;
    z-index: 9998;
    transition: opacity 0.3s ease;
}

.container {
    background-color: var(--card-background);
    padding: 2em;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    width: 95%;
    max-width: 500px;
}

#game-container {
    position: relative;
}

.hidden {
    display: none;
}

/* --- Animation Classes --- */
.animate-fade-out { animation: fade-out 0.5s ease-out forwards; }
.animate-fade-in-slide-up { animation: fade-in-slide-up 0.7s ease-in-out forwards; }
@keyframes fade-out { from { opacity: 1; transform: scale(1); } to { opacity: 0; transform: scale(0.95); } }
@keyframes fade-in-slide-up { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* --- Title Styles --- */
h1 { font-family: var(--font-glitch); font-size: clamp(2.5em, 10vw, 4em); color: var(--text-light); margin-bottom: 0.5em; position: relative; }
h1::before, h1::after { content: attr(data-text); position: absolute; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; }
h1::before { left: 2px; text-shadow: -2px 0 var(--color-x); clip-path: rect(44px, 450px, 56px, 0); animation: glitch-anim-1 2s infinite linear alternate-reverse; }
h1::after { left: -2px; text-shadow: -2px 0 var(--color-o), 2px 2px var(--color-x); clip-path: rect(86px, 450px, 140px, 0); animation: glitch-anim-2 3s infinite linear alternate-reverse; }
@keyframes glitch-anim-1 { 0% { clip-path: rect(42px, 9999px, 44px, 0); transform: skew(0.3deg); } 5% { clip-path: rect(17px, 9999px, 96px, 0); } 10% { clip-path: rect(40px, 9999px, 62px, 0); } 15% { clip-path: rect(87px, 9999px, 82px, 0); } 20% { clip-path: rect(137px, 9999px, 140px, 0); } 25% { clip-path: rect(36px, 9999px, 14px, 0); } 30% { clip-path: rect(84px, 9999px, 40px, 0); } 35% { clip-path: rect(122px, 9999px, 140px, 0); } 40% { clip-path: rect(140px, 9999px, 122px, 0); } 45% { clip-path: rect(13px, 9999px, 40px, 0); } 50% { clip-path: rect(50px, 9999px, 105px, 0); } 55% { clip-path: rect(13px, 9999px, 62px, 0); } 60% { clip-path: rect(40px, 9999px, 62px, 0); } 65% { clip-path: rect(84px, 9999px, 140px, 0); } 70% { clip-path: rect(21px, 9999px, 140px, 0); } 75% { clip-path: rect(133px, 9999px, 73px, 0); } 80% { clip-path: rect(78px, 9999px, 52px, 0); } 85% { clip-path: rect(133px, 9999px, 73px, 0); } 90% { clip-path: rect(33px, 9999px, 42px, 0); } 95% { clip-path: rect(42px, 9999px, 140px, 0); } 100% { clip-path: rect(140px, 9999px, 122px, 0); } }
@keyframes glitch-anim-2 { 0% { clip-path: rect(129px, 9999px, 101px, 0); transform: skew(0.5deg); } 5% { clip-path: rect(36px, 9999px, 42px, 0); } 10% { clip-path: rect(118px, 9999px, 129px, 0); } 15% { clip-path: rect(140px, 9999px, 140px, 0); } 20% { clip-path: rect(129px, 9999px, 101px, 0); } 25% { clip-path: rect(36px, 9999px, 42px, 0); } 30% { clip-path: rect(118px, 9999px, 129px, 0); } 35% { clip-path: rect(140px, 9999px, 140px, 0); } 40% { clip-path: rect(129px, 9999px, 101px, 0); } 45% { clip-path: rect(36px, 9999px, 42px, 0); } 50% { clip-path: rect(118px, 9999px, 129px, 0); } 55% { clip-path: rect(140px, 9999px, 140px, 0); } 60% { clip-path: rect(129px, 9999px, 101px, 0); } 65% { clip-path: rect(36px, 9999px, 42px, 0); } 70% { clip-path: rect(118px, 9999px, 129px, 0); } 75% { clip-path: rect(140px, 9999px, 140px, 0); } 80% { clip-path: rect(129px, 9999px, 101px, 0); } 85% { clip-path: rect(36px, 9999px, 42px, 0); } 90% { clip-path: rect(118px, 9999px, 129px, 0); } 95% { clip-path: rect(140px, 9999px, 140px, 0); } 100% { clip-path: rect(129px, 9999px, 101px, 0); } }

/* --- Menu Styles --- */
.player-input-group { display: flex; flex-direction: column; gap: 1.5em; margin: 2em 0; }
.player-input { display: flex; flex-direction: column; align-items: center; }
.player-input label { margin-bottom: 0.5em; font-size: 1.1em; font-weight: 600; }
.player-input input { width: 90%; max-width: 300px; padding: 12px; border-radius: 8px; border: 2px solid var(--input-border); background-color: var(--input-background); color: var(--text-dark); font-size: 1em; text-align: center; font-family: var(--font-primary); transition: border-color 0.3s ease; }
.player-input input:focus { outline: none; border-color: var(--input-focus-border); }

/* --- Game Board Styles --- */
.game-board { display: grid; grid-template-columns: repeat(3, clamp(80px, 20vw, 100px)); grid-template-rows: repeat(3, clamp(80px, 20vw, 100px)); gap: 10px; margin: 1em auto; justify-content: center; }
.cell { width: 100%; height: 100%; background-color: var(--input-background); display: flex; justify-content: center; align-items: center; font-size: clamp(2.5em, 15vw, 3em); font-weight: bold; cursor: pointer; border-radius: 8px; transition: background-color 0.3s, text-shadow 0.3s ease-in-out; }
.cell:hover { background-color: #d4d6d8; }
.cell.x { color: var(--color-x); text-shadow: 0 0 7px var(--color-x), 0 0 10px var(--color-x), 0 0 21px var(--color-x); }
.cell.o { color: var(--color-o); text-shadow: 0 0 7px var(--color-o), 0 0 10px var(--color-o), 0 0 21px var(--color-o); }

/* --- UI Elements --- */
.status { margin-top: 1em; font-size: 1.2em; font-weight: 600; min-height: 1.5em; transition: text-shadow 0.3s ease-in-out, color 0.3s ease-in-out; }
.status.player-x { color: var(--color-x); text-shadow: 0 0 5px var(--color-x), 0 0 10px var(--color-x); }
.status.player-o { color: var(--color-o); text-shadow: 0 0 5px var(--color-o), 0 0 10px var(--color-o); }

.btn { background-image: linear-gradient(to right, var(--gradient-start), var(--gradient-end)); color: var(--text-light); border: none; padding: 15px 30px; font-size: 1.1em; border-radius: 8px; cursor: pointer; transition: transform 0.3s ease, box-shadow 0.3s ease; text-transform: uppercase; font-weight: 700; letter-spacing: 1px; box-shadow: 0 4px 15px rgba(0,0,0,0.2); }
.btn:hover { transform: translateY(-3px); box-shadow: 0 7px 20px rgba(0,0,0,0.3); }

/* --- Settings Panel --- */
#settings-btn { position: absolute; top: 15px; right: 15px; width: 45px; height: 45px; padding: 0; font-size: 1.8em; line-height: 45px; }
.btn-icon { background: transparent; border: none; color: var(--text-light); cursor: pointer; border-radius: 50%; transition: background-color 0.3s, transform 0.3s; }
.btn-icon:hover { background-color: rgba(255, 255, 255, 0.1); transform: rotate(45deg); }

#settings-panel { position: fixed; top: 20px; right: 20px; z-index: 1000; background: #000000cc; backdrop-filter: blur(5px); border-radius: 12px; padding: 1.5em; padding-top: 2.5em; box-shadow: 0 8px 20px rgba(0,0,0,0.4); display: flex; flex-direction: column; gap: 1.5em; }
.btn-close { position: absolute; top: 5px; right: 5px; width: 35px; height: 35px; font-size: 1.5em; line-height: 35px; }
.btn-close:hover { transform: scale(1.1); }

.setting-group { display: flex; flex-direction: column; align-items: center; gap: 0.8em; }
.setting-group label { font-weight: 600; text-transform: uppercase; letter-spacing: 1px; font-size: 0.9em; }
.setting-controls { display: flex; align-items: center; gap: 1em; }
.btn-control { background: var(--card-background); border: 1px solid var(--background-dark); color: var(--text-light); width: 40px; height: 40px; border-radius: 50%; font-size: 1.5em; cursor: pointer; transition: background-color 0.3s, transform 0.2s; }
.btn-control:hover { background-color: #4a657e; }
.btn-control:active { transform: scale(0.9); }
.setting-controls span { font-size: 1.2em; font-weight: 600; min-width: 50px; }