/* Tic-Tac-Toe Theme - High Quality Upgrade */

:root {
    --bg: #0b0b1a;
    --card: #15152e;
    --card-border: #2a2a4a;
    --text: #f1f1f1;
    --text-muted: #8888aa;
    --accent-blue: #4d96ff;
    --accent-red: #e94560;
    --accent-green: #6bcb77;
    --accent-yellow: #ffd93d;
    --alien-green: #a2ff4d;
    --alien-purple: #b34dff;
}

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

body {
    font-family: 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    background: radial-gradient(circle at center, #1a1a35 0%, #0b0b1a 100%);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}

.game-container {
    width: 100%;
    max-width: 800px;
    padding: 1.5rem;
    text-align: center;
}

.title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: linear-gradient(to right, var(--accent-blue), var(--alien-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px rgba(77, 150, 255, 0.3));
}

.screen {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.hidden {
    display: none !important;
}

/* === Setup Card === */
.setup-card {
    background: var(--card);
    border: 2px solid var(--card-border);
    border-radius: 32px;
    padding: 3rem 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    position: relative;
    overflow: hidden;
}

.setup-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(77, 150, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.setup-section {
    margin-bottom: 2.5rem;
    position: relative;
    z-index: 1;
}

.setup-label {
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1.25rem;
}

.mode-toggles {
    display: flex;
    gap: 1.25rem;
    justify-content: center;
    flex-wrap: wrap;
}

.op-toggle {
    cursor: pointer;
}

.op-toggle input {
    display: none;
}

.op-btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid var(--card-border);
    border-radius: 16px;
    font-weight: 700;
    color: var(--text);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.op-btn:hover {
    border-color: var(--text-muted);
    transform: translateY(-2px);
}

.op-toggle input:checked + .op-btn {
    background: rgba(77, 150, 255, 0.1);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    box-shadow: 0 0 25px rgba(77, 150, 255, 0.4), inset 0 0 10px rgba(77, 150, 255, 0.2);
    transform: translateY(-4px) scale(1.05);
}

.start-btn {
    width: 100%;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--accent-blue), #3a86ff);
    border: none;
    border-radius: 20px;
    color: white;
    font-size: 1.5rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 10px 30px rgba(58, 134, 255, 0.4);
}

.start-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 40px rgba(58, 134, 255, 0.6);
}

/* === Board Styles === */
.status-bar {
    margin-bottom: 2.5rem;
}

.turn-indicator {
    display: inline-flex;
    align-items: center;
    gap: 1.25rem;
    background: rgba(21, 21, 46, 0.8);
    padding: 1rem 2.5rem;
    border-radius: 100px;
    border: 2px solid var(--card-border);
    font-size: 1.5rem;
    font-weight: 800;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.board-container {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    perspective: 1200px;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 15px;
    width: 100%;
    max-width: 480px;
    aspect-ratio: 1 / 1;
    background: rgba(77, 150, 255, 0.05);
    padding: 20px;
    border-radius: 32px;
    border: 2px solid rgba(77, 150, 255, 0.2);
    position: relative;
    transform: rotateX(35deg); /* Tilted board */
    transform-style: preserve-3d;
    box-shadow: 0 40px 100px rgba(0,0,0,0.6), 0 0 40px rgba(77, 150, 255, 0.1);
}

.cell {
    background: rgba(26, 26, 53, 0.6);
    border-radius: 20px;
    border: 2px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    transform-style: preserve-3d;
}

.cell:hover:not(.taken) {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-blue);
    transform: translateZ(10px);
}

.cell.taken {
    cursor: default;
    background: rgba(77, 150, 255, 0.05);
    border-color: rgba(77, 150, 255, 0.3);
}

/* === 3D SPRITES - STANDING UP === */
.sprite-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform-style: preserve-3d;
    transform: rotateX(-35deg); /* Counter-rotate to stand upright */
    animation: sprite-pop 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes sprite-pop {
    0% { transform: rotateX(-35deg) scale(0) translateZ(-50px); opacity: 0; }
    100% { transform: rotateX(-35deg) scale(1) translateZ(0); opacity: 1; }
}

.sprite-float {
    width: 60px;
    height: 85px;
    position: relative;
    transform-style: preserve-3d;
    animation: float-rotate 4s ease-in-out infinite;
    bottom: 20px; /* Pull it up to "stand" on the cell */
}

@keyframes float-rotate {
    0%, 100% { transform: rotateY(-15deg) translateY(0); }
    50% { transform: rotateY(15deg) translateY(-10px); }
}

/* Shadow underneath */
.sprite-shadow {
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%) rotateX(90deg);
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.5);
    filter: blur(8px);
    border-radius: 50%;
    animation: shadow-pulse 4s ease-in-out infinite;
}

@keyframes shadow-pulse {
    0%, 100% { transform: translateX(-50%) rotateX(90deg) scale(1); opacity: 0.5; }
    50% { transform: translateX(-50%) rotateX(90deg) scale(0.8); opacity: 0.3; }
}

/* 3D Robot Parts */
.robot-3d-box {
    position: absolute;
    transform-style: preserve-3d;
}

.r-3d-head {
    width: 40px; height: 32px;
    top: 0; left: 10px;
}

.r-3d-torso {
    width: 50px; height: 44px;
    top: 34px; left: 5px;
}

/* Face rendering helper */
.face {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 2px solid rgba(255,255,255,0.1);
    backface-visibility: inherit;
}

.robot-face { background: linear-gradient(135deg, #4d96ff, #2a4a7f); }
.robot-face-side { background: #1a3a6f; }
.robot-face-top { background: #6a8fcf; }

/* Alien Face rendering helper */
.alien-face { background: linear-gradient(135deg, var(--alien-green), #4e8c1a); }
.alien-face-side { background: #2a4d0d; }
.alien-face-top { background: #7ed321; }

.f-front  { transform: translateZ(15px); }
.f-back   { transform: translateZ(-15px) rotateY(180deg); }
.f-right  { width: 30px; right: -15px; transform: rotateY(90deg); }
.f-left   { width: 30px; left: -15px; transform: rotateY(-90deg); }
.f-top    { height: 30px; top: -15px; transform: rotateX(90deg); }
.f-bottom { height: 30px; bottom: -15px; transform: rotateX(-90deg); }

/* Details */
.r-eye-container {
    position: absolute;
    width: 100%; height: 100%;
    transform: translateZ(16px);
}
.r-eye { width: 8px; height: 8px; background: #fff; border-radius: 50%; position: absolute; top: 10px; box-shadow: 0 0 10px #fff; }
.r-eye-l { left: 8px; } .r-eye-r { right: 8px; }

.a-eye-container {
    position: absolute;
    width: 100%; height: 100%;
    transform: translateZ(16px);
}
.a-eye { width: 14px; height: 18px; background: #000; border-radius: 50%; position: absolute; top: 8px; }
.a-eye-l { left: 6px; transform: rotate(-15deg); } .a-eye-r { right: 6px; transform: rotate(15deg); }

/* Remove old sprites */
.robot-sprite, .alien-sprite { display: none; }

/* === Winning Line === */
.win-line-svg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 100;
}

#win-line {
    visibility: hidden;
    stroke: var(--accent-yellow);
    stroke-width: 12;
    filter: drop-shadow(0 0 15px var(--accent-yellow)) drop-shadow(0 0 30px var(--accent-yellow));
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
}

/* === Controls === */
.game-controls {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.reset-btn, .back-btn {
    padding: 1rem 2rem;
    border-radius: 16px;
    font-weight: 800;
    font-size: 1.1rem;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
}

.reset-btn { background: var(--accent-blue); color: white; border: none; box-shadow: 0 4px 15px rgba(77, 150, 255, 0.3); }
.back-btn { background: rgba(255, 255, 255, 0.05); color: var(--text-muted); border: 2px solid var(--card-border); }

.reset-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(77, 150, 255, 0.4); }

/* === Game Over === */
.gameover-card {
    background: var(--card);
    border: 3px solid var(--accent-blue);
    border-radius: 40px;
    padding: 4rem 2rem;
    box-shadow: 0 30px 100px rgba(0,0,0,0.8), 0 0 50px rgba(77, 150, 255, 0.2);
    max-width: 500px;
    margin: 0 auto;
    position: relative;
    animation: gameover-appear 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes gameover-appear {
    0% { transform: scale(0.8) translateY(50px); opacity: 0; }
    100% { transform: scale(1) translateY(0); opacity: 1; }
}

.gameover-emoji {
    font-size: 6rem;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 20px rgba(255,255,255,0.2));
}

.play-again-btn {
    background: linear-gradient(135deg, var(--accent-green), #45a049);
    color: white; border: none; padding: 1.25rem; border-radius: 16px;
    width: 100%; font-size: 1.25rem; font-weight: 900; cursor: pointer;
    margin-top: 2rem; box-shadow: 0 8px 25px rgba(107, 203, 119, 0.3);
}

.menu-btn {
    background: transparent; color: var(--text-muted); border: 2px solid var(--card-border);
    width: 100%; padding: 1rem; border-radius: 16px; margin-top: 1rem; cursor: pointer;
}

@media (max-width: 500px) {
    .title { font-size: 2.2rem; }
    .board { max-width: 320px; gap: 10px; padding: 15px; }
    .status-bar .turn-indicator { font-size: 1.1rem; padding: 0.75rem 1.5rem; }
    .robot-sprite, .alien-sprite { transform: scale(0.7); }
}