/* ===================== Body ===================== */
body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #0f2027; /* optional, gaming feel */
    color: #fff;
}

/* ===================== Header ===================== */
header {
    background: linear-gradient(135deg, #00AEEA, #20c997);
    color: #fff;
    text-align: center;
    height: 70px;
    line-height: 70px; /* vertical centering */
    font-size: 1.5em;
    font-weight: bold;
    letter-spacing: 1px;
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
    margin: 0 0 60px 0;
    padding: 0;
    box-sizing: border-box;
    position: relative;
    width: 100%;
    border-bottom: 3px solid #00FFE0;
}

/* ===================== Paragraphs ===================== */
p {
    font-size: 14pt;
    font-weight: bold;
    font-family: Sans-serif;
    text-align: center;
    margin: 0 auto 10px auto;
    display: block;
    position: relative;
}

/* ===================== Links ===================== */
a {
    color: #00AEEA;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #20c997;
}

a:visited {
    color: #00AEEA;
}

/* ****************** Table style ****************** */
/* ===================== Tic Tac Toe Table ===================== */
#tab-tic-tac-toe {
    margin: 0 auto;
    padding: 0;
    font-family: 'Sans-serif';
    width: 310px;
    height: 310px;
    border: 3px solid #00AEEA;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 174, 234, 0.5);
    background: #F8F8F8;
    border-collapse: collapse;
    text-align: center;
}

/* ===================== Table Rows and Cells ===================== */
#tab-tic-tac-toe td {
    cursor: pointer;
    width: 100px;
    height: 100px;
    font-size: 3em;
    font-weight: bold;
    color: #00AEEA;
    background: linear-gradient(145deg, #e0e0e0, #cfcfcf);
    border: 2px solid #CECECE;
    transition: all 0.2s ease-in-out;
    text-align: center;
    vertical-align: middle;
}

/* Remove double borders */
#tab-tic-tac-toe td:first-child {
    border-left: none;
}
#tab-tic-tac-toe tr:last-child td {
    border-bottom: none;
}

/* Hover effect for cells */
#tab-tic-tac-toe td:hover {
    background: linear-gradient(145deg, #00AEEA, #20c997);
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 174, 234, 0.7);
}

/* Optional: X and O animation effect */
#tab-tic-tac-toe td.x {
    color: #ff3c3c;
    text-shadow: 0 0 10px #ff3c3c;
}

#tab-tic-tac-toe td.o {
    color: #00ffe0;
    text-shadow: 0 0 10px #00ffe0;
}

/* ===================== Restart Button ===================== */
#bnt-restart {
    display: block;
    padding: 12px 20px;
    margin: 20px auto;
    width: 220px;
    font-size: 1.5em;
    font-weight: bold;
    color: #fff;
    background: linear-gradient(45deg, #00AEEA, #20C997);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 174, 234, 0.6);
    transition: all 0.3s ease-in-out;
    text-align: center;
}

/* Hover effect with glow */
#bnt-restart:hover {
    background: linear-gradient(45deg, #00FFE0, #1DC5FF);
    transform: scale(1.05);
    box-shadow: 0 0 20px #00FFE0, 0 0 40px #1DC5FF;
}

/* Active (clicked) effect */
#bnt-restart:active {
    transform: scale(0.95);
    background: linear-gradient(45deg, #0787B3, #1DC5FF);
    box-shadow: 0 0 15px #0787B3;
}

/* Disabled state */
#bnt-restart:disabled {
    color: #888;
    background: #CECECE;
    cursor: not-allowed;
    box-shadow: none;
}