body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* Layout */
.game-container {
    display: flex;
    gap: 40px;
}

/* Sidebar */
.sidebar {
    background: #ffffff10;
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 20px;
    color: white;
    text-align: center;
    width: 200px;
}

.sidebar button {
    margin-top: 20px;
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    background: #ffffff20;
    color: white;
    font-weight: bold;
}

.sidebar button:hover {
    background: #ffffff40;
}

/* Turn Indicator */
.turn {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 20px auto;
    transition: background 0.3s;
}

.red {
    background: red;
}

.yellow {
    background: yellow;
}

/* Board */
.board-wrapper {
    position: relative;
    background: #0044cc;
    border-radius: 20px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.6);
    padding: 20px;
    display: inline-block;
}

#board {
    display: grid;
    grid-template-columns: repeat(7, 90px);
    grid-template-rows: repeat(6, 90px);
}

.cell {
    width: 90px;
    height: 90px;
    position: relative;
}

/* Hole cut-out */
.cell::before {
    content: "";
    position: absolute;
    width: 75px;
    height: 75px;
    background: #001f5c;
    border-radius: 50%;
    top: 7.5px;
    left: 7.5px;
    z-index: 1;
}

/* Glossy 3D Disk */
.disk {
    width: 75px;
    height: 75px;
    border-radius: 50%;
    position: absolute;
    left: 7.5px;
    top: 7.5px;
    z-index: 2;
    background: radial-gradient(circle at 30% 30%, #ff6666, #cc0000);
    box-shadow:
        inset -6px -6px 10px rgba(0,0,0,0.4),
        inset 4px 4px 8px rgba(255,255,255,0.3),
        0 6px 10px rgba(0,0,0,0.5);
    transition: transform 0.4s cubic-bezier(.25,.8,.25,1);
}

.disk.yellow {
    background: radial-gradient(circle at 30% 30%, #ffff66, #e6c200);
}

/* SVG overlay perfectly matches grid */
.win-line {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 630px;   /* 7 * 90 */
    height: 540px;  /* 6 * 90 */
    pointer-events: none;
    z-index: 5;
}

.win-line line {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawLine 0.6s ease forwards;
}

@keyframes drawLine {
    to { stroke-dashoffset: 0; }
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.65);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: linear-gradient(145deg, #ffffff, #f0f0f0);
    padding: 50px 60px;
    border-radius: 25px;
    text-align: center;
    box-shadow: 0 30px 60px rgba(0,0,0,0.4);
    animation: scaleUp 0.3s ease;
}

.modal-content h2 {
    margin-bottom: 20px;
    font-size: 28px;
}

.modal-content button {
    margin-top: 20px;
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    font-weight: bold;
    cursor: pointer;
    background: #0044cc;
    color: white;
    font-size: 16px;
}

.modal-content button:hover {
    background: #002e88;
}

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

@keyframes scaleUp {
    from {transform: scale(0.8);}
    to {transform: scale(1);}
}


.preview {
    opacity: 0.4;
    pointer-events: none;
}


.hidden {
    display: none;
}